Dissertations / Theses on the topic 'Agent'
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1
Doskočilová, Veronika. "Využití agentů v business procesech." Master's thesis, Vysoká škola ekonomická v Praze, 2011. http://www.nusl.cz/ntk/nusl-124783.
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This work deals with the possibilities of using agents and multiagent systems in the areas of business process management and business process modeling. The aim of the theoretical part is to describe the theory of artificial agents, to assess the benefits of this approach and to describe current applications of MAS in BPM. In the theoretical part I also describe the issue of management and business process modeling and methodology MMABP. The aim of the analytical part is to summarize the possibilities of using MAS in BPM in the situations where business processes are already described and modeled and in the situations where there are no such descripctions nor models yet . In this part I also want to introduce my theory of agent-process, which is the possibility of looking at processes as autonomous agents. This theory is presented in practical demonstrations and examples by using the TROPOS methodology, and this theory is supported by references from the areas of agent and business process modeling.
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Lau, Pik Lik Billy. "Interdependence between agents in multi agent systems." Thesis, Curtin University, 2014. http://hdl.handle.net/20.500.11937/439.
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Interdependence relationships have defined the foundation of cooperation between agents but limited by existing protocols. As a consequence, the idle agents are not able to join and benefit through it. First, the inter-relationship has been studied and certified for the purpose of securing mutual gains. Next, the join coalition mechanism is proposed to help idle agents to join existing macroscopic and microscopic coalitions which are based on the goals compatibilities, budget and trust
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Dinu, Razvan. "Web Agents : towards online hybrid multi-agent systems." Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20126/document.
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Multi-agent systems have been used in a wide range of applications from computer-based simulations and mobile robots to agent-oriented programming and intelligent systems in real environments. However, the largest environment in which software agents can interact is, without any doubt, the World Wide Web and ever since its birth agents have been used in various applications such as search engines, e-commerce, and most recently the semantic web. However, agents have yet to be used on the Web in a way that leverages the full power of artificial intelligence and multi-agent systems, which have the potential of making life much easier for humans. This thesis investigates how this can be changed, and how agents can be brought to the core of the online experience in the sense that we want people to talk and interact with agents instead of "just using yet another application or website". We analyze what makes it hard to develop intelligent agents on the web and we propose a web agent model (WAM) inspired by recent results in multi-agent systems. Nowadays, a simple conceptual model is the key for widespread adoption of new technologies and this is why we have chosen the MASQ meta-model as the basis for our approach, which provides the best compromise in terms of simplicity of concepts, generality and applicability to the web. Since until now the model was introduced only in an informal way, we also provide a clear formalization of the MASQ meta-model.Next, we identify the three main challenges that need to be addressed when building web agents: integration of bodies, web semantics and user friendliness. We focus our attention on the first two and we propose a set of principles to guide the development of what we call strong web agents. Finally, we validate our proposal through the implementation of an award winning platform called Kleenk. Our work is just a step towards fulfilling the vision of having intelligent web agents mediate the interaction with the increasingly complex World Wide WebMulti-agent systems have been used in a wide range of applications from computer-based simulations and mobile robots to agent-oriented programming and intelligent systems in real environments. However, the largest environment in which software agents can interact is, without any doubt, the World Wide Web and ever since its birth agents have been used in various applications such as search engines, e-commerce, and most recently the semantic web. However, agents have yet to be used on the Web in a way that leverages the full power of artificial intelligence and multi-agent systems, which have the potential of making life much easier for humans. This thesis investigates how this can be changed, and how agents can be brought to the core of the online experience in the sense that we want people to talk and interact with agents instead of "just using yet another application or website". We analyze what makes it hard to develop intelligent agents on the web and we propose a web agent model (WAM) inspired by recent results in multi-agent systems. Nowadays, a simple conceptual model is the key for widespread adoption of new technologies and this is why we have chosen the MASQ meta-model as the basis for our approach, which provides the best compromise in terms of simplicity of concepts, generality and applicability to the web. Since until now the model was introduced only in an informal way, we also provide a clear formalization of the MASQ meta-model.Next, we identify the three main challenges that need to be addressed when building web agents: integration of bodies, web semantics and user friendliness. We focus our attention on the first two and we propose a set of principles to guide the development of what we call strong web agents. Finally, we validate our proposal through the implementation of an award winning platform called Kleenk. Our work is just a step towards fulfilling the vision of having intelligent web agents mediate the interaction with the increasingly complex World Wide Web
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Harder, Malte. "Information driven self-organization of agents and agent collectives." Thesis, University of Hertfordshire, 2014. http://hdl.handle.net/2299/13907.
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From a visual standpoint it is often easy to point out whether a system is considered to be self-organizing or not, though a quantitative approach would be more helpful. Information theory, as introduced by Shannon, provides the right tools not only quantify self-organization, but also to investigate it in relation to the information processing performed by individual agents within a collective. This thesis sets out to introduce methods to quantify spatial self-organization in collective systems in the continuous domain as a means to investigate morphogenetic processes. In biology, morphogenesis denotes the development of shapes and form, for example embryos, organs or limbs. Here, I will introduce methods to quantitatively investigate shape formation in stochastic particle systems. In living organisms, self-organization, like the development of an embryo, is a guided process, predetermined by the genetic code, but executed in an autonomous decentralized fashion. Information is processed by the individual agents (e.g. cells) engaged in this process. Hence, information theory can be deployed to study such processes and connect self-organization and information processing. The existing concepts of observer based self-organization and relevant information will be used to devise a framework for the investigation of guided spatial self-organization. Furthermore, local information transfer plays an important role for processes of self-organization. In this context, the concept of synergy has been getting a lot attention lately. Synergy is a formalization of the idea that for some systems the whole is more than the sum of its parts and it is assumed that it plays an important role in self-organization, learning and decision making processes. In this thesis, a novel measure of synergy will be introduced, that addresses some of the theoretical problems that earlier approaches posed.
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Vanzan, Alessio <1993>. "Mobile Agents Rendezvous in Networks Despite a Malicious Agent." Master's Degree Thesis, Università Ca' Foscari Venezia, 2017. http://hdl.handle.net/10579/10604.
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The use of mobile agents, i.e., autonomous software entities , finds its
application in many settings such as Network Maintenance, Electronic commerce
and Intelligent search.
Given a network, we have a set of mobile agents that moves from node to node
in order to achieve a common task. Security is an important issue that can
arise in such environment and that has been widely studied in literature.
In particular, it is important to study the problem of having a host or an
agent that hinders or harms the honest agents in their tasks.
In this thesis we consider a scenario in which one of the mobile agents may
behave maliciously and thus act in order to prevent the other agents to complete
their goal. We study the Rendezvous problem,i.e.,
the problem of gathering a set of mobile agents at a single node of a network, starting from a
initial scattered configuration and despite the presence of a Malicious agent, and in particular, we propose a novel solution in the bidirectional hypercube network.
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Mazuel, Laurent. "Traitement de l'hétérogénéité sémantique dans les interactions humain-agent et agent-agent." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2008. http://tel.archives-ouvertes.fr/tel-00413004.
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Le thème général de cette thèse est le traitement de l'hétérogénéité sémantique dans les interactions humain-agent et agent-agent. Plus précisément, nous étudions le cas où un agent informatique muni d'un modèle de représentation de ses connaissances doit traiter des demandes envoyées par d'autres interlocuteurs, qu'il s'agisse d'utilisateurs humains ou d'agents informatiques.La plupart des approches segmentent ce traitement en fonction de l'émetteur de la demande (humain ou agent). Nous pensons au contraire qu'il est possible de proposer un modèle d'interaction commun aux deux situations. Ainsi, nous présentons d'abord un algorithme d'interprétation sémantique de la commande indépendant du type d'interaction (humain-agent ou agent-agent). Cet algorithme considère le rapport entre « ce qui est compris » de la commande et « ce qui est possible » pour la machine. Ce rapport intervient dans un système de sélection de réponses basé sur une mesure de degré de relation sémantique. Nous proposons ensuite une telle mesure, conçue pour prendre en compte plus d'informations que la plupart des mesures actuelles.
Nous étudions ensuite les implémentations que nous avons faites dans les cadres humain-agent et agent-agent. Pour l'implémentation humain-agent, l'une des spécificités est l'utilisation d'une langue naturelle, impliquant le besoin d'utiliser des outils de modélisation de la langue. Pour l'implémentation agent-agent, nous proposerons une adaptation de notre architecture, en s'appuyant sur des protocoles d'interactions entre agents.
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Bergh, Niklas. "An autonomous multi-agent evacuation scenario using sight and agent-to-agent communication." Thesis, KTH, Optimeringslära och systemteori, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147930.
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This report simulates an evacuation scenario in a crowded building and attempts to optimize the flow of agents during the process. Each agent is autonomous and assumed to know the map. Agents also have the ability to communicate between themselves, as well as using sight to perceive the environment around them. The purpose is to design a set of rules making the agents evacuate efficiently, which then can applied in real world situation for training people in evacuation strategies. The model used is a time and space discrete setting, where agents move in a discrete graph, and have several exits to choose between. The number of agents is large, making crowd control an important factor. The simulation is run with a number of numerical algorithms such as path planning and logical reasoning. The algorithms are programmed into a simulation program allowing the evacuation to be shown in real time. The results shows the importance of agents communicating, and clear paths to emergency exits.
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Nagi, Khaled [Verfasser]. "Transactional agents : towards a robust multi-agent system / K. Nagi." Berlin, 2001. http://d-nb.info/965521001/34.
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Tajer, Jean. "Detection of malicious hosts against agents in Mobile Agent networks." Thesis, University of Portsmouth, 2018. https://researchportal.port.ac.uk/portal/en/theses/detection-of-malicious-hosts-against-agents-in-mobile-agent-networks(beca3871-a989-4137-9a4d-13c88d8893d9).html.
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Over the last decade, networks have become increasingly advanced in terms of size, complexity and the level of heterogeneity, due to increase of number of users, devices and implementation of cloud among big enterprises and developing smart cities. As networks become more complicated, the existing client-server paradigm suffers from problems such as delay, jitter, bad quality of service, insufficient scalability, availability and flexibility. The appearance of mobile agents' technology is getting popular as means for an efficient way to access remote resources on computer networks. Mobile Agent- systems usually benefit from the following: asynchronous execution, dynamic adaptation, fault-tolerance improvement in network latency, protocol encapsulation, reduction in network load and robustness. However, one of the major technical obstacles to a wider acceptance of the mobile agent is security which is the modus operandi to protect the mobile agents against malicious hosts. This work proposes how the Mobile Agents (MA), supported by a new solid models (detection and protection), can present a new way of securing mobile agents against malicious hosts. The work contributes in proposing a new computing model for protection against malicious hosts. This model is based on trust, which is a combination of two kinds of trust: policy enforcement and control and punishment. The originality of this model is the introduction of the concept of setting up an active storage element in the agent space, called as "home away from home", for partial result storage and separation as well as digital signing of the destination of the mobile agent. An efficient flooding detection scheme is developed by integrating the sketch technique with the Divergence Measures (Hellinger Distance, Chi-Square and Power Divergences). This type of integration can be considered unique in comparison with existing solutions over a Mobile Agent network. The sketch data- structure summarizes the mobile agent's process of calls generating into a fixed set of data for developing a probability model. The Divergence Measures techniques, combined with a Mobile Agent traffic, efficiently identifies attacks, by monitoring the distance between current traffic distribution and the estimated distribution, based on history information. Compared to the previous detection system and existing works, the proposed techniques achieve the advantages of higher accuracy and flexibility, to deal with low intensity attacks and the ability to track the period of attack. Simulation results are presented to demonstrate the performance of the proposed detection model. This work achieves in outperforming the existing detection solutions by tuning the Divergence Measures. An evaluation of the scheme is done via the receiver-operating characteristic (ROC). The work achieves in outperforming the existing detection solutions by tuning the Power Divergence with a value of β=2.2. With this value of β, the detection scheme leads to a very attractive performance in terms of True Positive Rate (100%), False Positive Rate (3.8%) and is capable of detecting low intensity attacks. Moreover, the Power Divergence with β=2.2 presents a better detection accuracy of 98.1% in comparison with Hellinger Distance (60%) and Chi-square (80%). Since the scenarios in consideration in this work can be reasonably related to any type of network, the strength of the proposed model can alternatively be applied to any enterprise network.
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Huerta, Jose Manuel. "Attitudes of county Extension agents toward agent specialization in Ohio /." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487846354481973.
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Huerta, Jose M. "Attitudes of county extension agents toward agent specialization in Ohio." Connect to resource, 1993. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1202155098.
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Xu, Ke. "Mobile agent security through multi-agent cryptographic protocols." Thesis, University of North Texas, 2004. https://digital.library.unt.edu/ark:/67531/metadc4473/.
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An increasingly promising and widespread topic of research in distributed computing is the mobile agent paradigm: code travelling and performing computations on remote hosts in an autonomous manner. One of the biggest challenges faced by this new paradigm is security. The issue of protecting sensitive code and data carried by a mobile agent against tampering from a malicious host is particularly hard but important. Based on secure multi-party computation, a recent research direction shows the feasibility of a software-only solution to this problem, which had been deemed impossible by some researchers previously. The best result prior to this dissertation is a single-agent protocol which requires the participation of a trusted third party. Our research employs multi-agent protocols to eliminate the trusted third party, resulting in a protocol with minimum trust assumptions. This dissertation presents one of the first formal definitions of secure mobile agent computation, in which the privacy and integrity of the agent code and data as well as the data provided by the host are all protected. We present secure protocols for mobile agent computation against static, semi-honest or malicious adversaries without relying on any third party or trusting any specific participant in the system. The security of our protocols is formally proven through standard proof technique and according to our formal definition of security. Our second result is a more practical agent protocol with strong security against most real-world host attacks. The security features are carefully analyzed, and the practicality is demonstrated through implementation and experimental study on a real-world mobile agent platform. All these protocols rely heavily on well-established cryptographic primitives, such as encrypted circuits, threshold decryption, and oblivious transfer. Our study of these tools yields new contributions to the general field of cryptography. Particularly, we correct a well-known construction of the encrypted circuit and give one of the first provably secure implementations of the encrypted circuit.
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Blanchette, Andrew Michael. "Agent Brownie." Digital Commons at Loyola Marymount University and Loyola Law School, 2014. https://digitalcommons.lmu.edu/etd/50.
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Logie, Robert. "A study of agent influence in nested agent interactions." Thesis, Open University, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520785.
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VELMOVITSKY, PEDRO ELKIND. "IBOT: AN AGENT-BASED SOFTWARE FRAMEWORK FOR CREATING DOMAIN CONVERSATIONAL AGENTS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2018. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=35430@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
Chatbots são programas de computador que interagem com usuários utilizando linguagem natural. Desde sua origem, a tecnologia avançou significantemente e aplicações baseadas na nuvem de grandes empresas permitiram que desenvolvedores criassem chatbots inteligentes e eficientes. No entanto, não há muitas abordagens de desenvolvimento aos principais módulos de um chatbot que são flexíveis o suficiente para permitir a criação de chatbots diferentes para cada domínio, mantendo um robusto controle de diálogo na aplicação. Existem trabalhos que tentam desenvolver uma abordagem mais flexível, cada um com suas vantagens e desvantagens. Uma das vantagens mais notáveis é o uso de sistemas multiagentes para distribuir e realizar tarefas feitas por chatbots. Nesse contexto, este trabalho propõe um framework geral e flexível baseado em sistemas multiagentes para construir chatbots em um domínio escolhido pelo desenvolvedor, com controle de diálogo na aplicação. Esta solução usa uma adaptação da abordagem de estado da informação, e agentes de software, para gestão do diálogo. Para validar a arquitetura proposta, um cenário de uso com 4 chatbots de prova de conceito são analisados e discutidos.
Chatbots are computer programs that interact with users using natural language. Since its inception, the technology has advanced greatly and cloud-based platforms from big companies allow developers to create intelligent and efficient chatbots. However, there are not many development approaches to the main modules of a chatbot that are flexible enough to allow the creation of different chatbots for each domain, while maintaining a robust dialogue control in the application. There have been some works that try to develop a more flexible approach, each of them with their own advantages and disadvantages. One of the most notable advantages is the use of multi-agent systems to distribute and perform the tasks performed by the chatbot. In this context, this work proposes a general and flexible architecture based on multi-agent systems for building chatbots in any domain chosen by the developer, with dialogue control in the application. This architecture uses an adaptation of the information state approach, also using software agents, to perform dialogue management. To validate the proposed architecture, an user scenario involving the implementation of 4 proof of concept chatbots is analyzed discussed.
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Sauvage, Sylvain. "Conception de systèmes multi-agents : un thésaurus de motifs orientés agent." Caen, 2003. http://www.theses.fr/2003CAEN2042.
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Conception de Systèmes Multi-Agents : un thésaurus de motifs orientés agent. Capitaliser et diffuser l'expérience sur les systèmes multi-agents sont deux mécanismes clefs que le classique développement par méthodes et outils ne permet pas d'intégrer. Notre hypothèse est que, parmi les techniques existantes collectant et formalisant l'expérience, les motifs (patterns) sont la plus apte à rendre compte des concepts agent et à s'adapter aux problèmes variés du développement de SMA. Nous présentons plusieurs motifs orientés agent qui abordent toutes les phases du développement, depuis l'analyse jusqu'à la mise en oeuvre, y compris la reconception (antimotifs). Nos motifs exposent différents niveaux d'abstraction, comme les métamodèles ou les métaphores, très utilisées par le paradigme agent. Nos motifs sont intégrés dans un thésaurus qui révèle leurs liens. Par ce thésaurus et au travers de son utilisation sur un exemple, nous montrons que la technique des motifs permet d'expliciter et de diffuser les concepts agent et qu'elle est une aide pragmatique et ouverte.
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Burian, Jan. "Reaktivní multiagentní modely v ekonomii." Doctoral thesis, Vysoká škola ekonomická v Praze, 2003. http://www.nusl.cz/ntk/nusl-77107.
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Multi-agent models are software models of real systems, which are compounded of a large amount of active autonomous units -- agents. The main theme of this study is the application of multi-agent models in economics. In the first part of this study I synthesized information from many sources and created a proposal of methodology of multi-agent modeling in social sciences. This methodology is illustrated by a detailed analysis of a well-known model of ethnocentric behavior. I focused on the issue of complexity a self-organization a observed the development of different kinds of structural complexity. Another important issue I'm dealing with is the relation between multi-agent models and analytical models used by the mainstream economy The second part contains three applications of multi-agent models in economy. All described models are research models -- the aim is to get insight into the fundamental laws controlling the dynamics of the system. Research models should be as simple as possible -- than we can understand how the behavior of the system is resulting from the interaction of agents. All models represent an alternative to some typical economic situation. The alternative consists mainly in abandoning of the assumption of full rationality of agents. I focused on models with reactive agents, which don't dispose any memory (or only an indirect form of memory) and have no ability of complex symbolical representation of the environment. Reactivity of agents doesn't necessarily mean an unwanted limitation. It could be properly used to model different kinds of bounded rationality. The model of transaction costs on financial markets is based on another model, which showed how the instability of the financial market could result from interactions of agents with bounded rationality. The instability of the financial markets contradicts the Effective Markets Hypothesis. I modified and extended this model with the mechanism of transaction cost. The model shows that higher transaction costs lead to greater stability of the market, they decrease the volume of trade and to some extent they can increase the efficiency of the modeled market. The model of evolution of aversion to risk and ambiguity is inspired by psychological and neurological experiments whose results contradict the Expected Utility Hypothesis. Model shows that there exists very simple mechanism which leads to evolution of risk and ambiguity aversion. This aversion evolves because of situations when the agent can repeatedly decide between two choices, one brings him low but risk free utility, second brings him higher utility which involves the risk that the agent will lose its ability to get any utility in the future (e.g. it will die). The model shows that sexual reproduction strengthens this mechanism. If this mechanism has also evolved in humans, it can influence their behavior and lead to "irrational" behavior contradicting the Expected utility hypothesis. The model of monopsony on the labor market analyses the situation in which the employer could cut the wages to the existential minimum of workers. In such a case are the workers paradoxically to increase the labor supply when the wages are decreasing. The model further analyses the influence of consumer loans on the profit of the employer, unemployment and welfare. The model shows that the increasing of the probability of consumer loans increases the profits, increases unemployment, decreases well-fare and in some situations it enables the employer to decrease the wages to the existential minimum. The model also suggests that for very low wages the decrease of minimum wage could lead to increase of unemployment. From the results recommendations could be obtained both for the profit maximizing employer and for the workers resisting the wage cuts.
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Cozzolino, Clifford Joseph. "DADS - A Distributed Agent Delivery System." Thesis, University of North Texas, 2002. https://digital.library.unt.edu/ark:/67531/metadc3352/.
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Mobile agents require an appropriate platform that can facilitate their migration and execution. In particular, the design and implementation of such a system must balance several factors that will ensure that its constituent agents are executed without problems. Besides the basic requirements of migration and execution, an agent system must also provide mechanisms to ensure the security and survivability of an agent when it migrates between hosts. In addition, the system should be simple enough to facilitate its widespread use across large scale networks (i.e Internet). To address these issues, this thesis discusses the design and implementation of the Distributed Agent Delivery System (DADS). The DADS provides a de-coupled design that separates agent acceptance from agent execution. Using functional modules, the DADS provides services ranging from language execution and security to fault-tolerance and compression. Modules allow the administrator(s) of hosts to declare, at run-time, the services that they want to provide. Since each administrative domain is different, the DADS provides a platform that can be adapted to exchange heterogeneous blends of agents across large scale networks.
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Helin, Heikki. "Supporting nomadic agent-based applications in the FIPA agent architecture." Helsinki : University of Helsinki, 2003. http://ethesis.helsinki.fi/julkaisut/mat/tieto/vk/helin/.
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Cederberg, Olle, and Nils Skogfeldt. "Call Forwarding Agent." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 1998. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-61787.
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In today’s world of telecommunications there is an increasing problem with reaching people one wishes to speak to. People have several telephones and this makes the situation complex for the caller. Many phone calls are left unanswered. The Call Forwarding Agent is in this report presented as a solution to this reachability problem. The idea is to have an agent setting call forwards of all the users’ phones or numbers, towards the terminal where he is available. Later, when someone calls any of the users’ phones, the call will be terminated at the terminal where the user can receive it. The Call Forwarding Agent is compared to a number of similar services. The personal number service offers the same functionality as the Call Forwarding Agent, but the Call Forwarding Agent does not force the subscriber to change phone number and it also admits a simple call screening. We have implemented a prototype of the Call Forwarding Agent that can set call forwards of regular Public Service Telephony Network terminals and the Internet telephones in Ellemtel’s IP-phone system.
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Cuesta, Rivalta Patricia. "Mobile agent management." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0016/MQ57724.pdf.
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Gu, Gordon Ping. "Agent policy patterns." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0019/MQ57771.pdf.
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Brusewitz, Collin Emanuel, and Andreas Svensson. "The principal agent." Thesis, Högskolan Kristianstad, Sektionen för hälsa och samhälle, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-12765.
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Problem: How can segments on Aktietorget explain how a lemon market can not only survive but grow? Purpose: The purpose is to try to explain how Aktietorget can grow under lemon market conditions by gauging investor groupings investment tendencies. Method: Quantitative archival study regarding returns and price per share depending on investor identity. Conclusion: Finance industry investor yields higher returns, which implicates the possibility of rational investing. This is attributed to either identity inherited capabilities or them being agents in the place of the principal. The private investor on the other hand is full principals and has a tendency towards low price per share. All other capital on Aktietorget conforms to the lottery characteristics of Aktietorget.
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Rochford, Damien (Damien Joseph). "Agent and environment." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/84421.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Linguistics and Philosophy, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 65-67).
This paper is about how agents learn. There is a picture of learning that is very influential in epistemology; I call it 'the Classical Picture'. As influential as it is, it is a flawed picture of learning, and epistemology is distorted by it. In this paper, I offer an alternative: the Calibration Picture. It is based on an extended analogy between agents and measuring devices. Epistemology looks very different from the Calibration point of view. Distinctions that are absolute, given the Classical Picture, are relative, given the Calibration Picture. These include the distinction between enabling and justifying roles of experience, the distinction between a priori and a posteriori knowledge, and the distinction between irrationality and ignorance. The beautiful thing about the Calibration Picture is that it gives you a precise way to characterise what is absolute, and a precise way to recover Classical distinctions from that absolute thing, relative to a context. In this way, the Calibration Picture enables you to recover much of the power of the Classical Picture, while offering a new way to understand its significance.
by Damien Rochford.
Ph.D.
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Cuesta, Rivalta Patricia Carleton University Dissertation Engineering Systems and Computer. "Mobile agent management." Ottawa, 2000.
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Gu, Gordon Ping Carleton University Dissertation Computer Science. "Agent policy patterns." Ottawa, 2000.
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Passi, Emilio C. "Bloom's taxonomy agent /." View online record:, 2000. http://srproj.lib.calpoly.edu/projects/csc/Passi%5FEmilio/.
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Marques, Beatriz Sorrentino. "O agente apagado: o papel do agente nas explicações de ações." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/8/8133/tde-11032016-134104/.
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O problema do Desaparecimento do Agente é uma objeção que tem assolado a Teoria Causal da Ação ao longo da maior parte da sua história contemporânea, mesmo tendo essa teoria se tornado a ortodoxia da explicação de ações. A objeção questiona qual seria o papel do agente, se é que ele teria algum, se apenas seus estados mentais parecem ter um papel causal relevante na produção de ações, como afirma a Teoria Causal da Ação. Essa questão permanece sem resposta satisfatória e recentemente tem originado até mesmo versões recentes do problema do Desaparecimento do Agente que levam o Livre Arbítrio e a consciência em consideração como sendo centrais para o debate. Assim, aceitar a Teoria Causal da Ação requer lidar com o problema em questão. Esse debate se beneficiará do diálogo com a psicologia e a neurociência e, com base nessa troca, eu argumentarei que o problema do Desaparecimento do Agente surge de uma concepção equivocada do que seria um agente humano e qual seria o seu papel na produção de suas ações. Isso se torna claro quando percebemos que essa concepção não corresponde ao nosso conhecimento científico atual a respeito da produção das ações humanas. Aceito isso, eu proponho então uma concepção diferente de agentes que não permite o surgimento do problema do Desaparecimento do Agente.The problem of the Disappearing Agent is an objection that has haunted the Causal Theory of Action for most of its contemporary history, even if this theory has become the orthodoxy of action explanation. The objection questions what role, if any, is reserved for the agent, if only her mental states seem to have a relevant causal role in the production of action, as the Causal Theory of Action would have it. This question remains unsatisfactorily answered, and has even originated recent versions of the Disappearing Agent issue, which take Free Will and consciousness as being at the center of the debate. Therefore, acceptance of the Causal Theory of Action requires dealing with such problem. This debate will benefit from a dialog with psychology and neuroscience, and based on this exchange I will argue that the issue of the Disappearing Agent springs from a misguided conception of what is a human agent and what is the agents role in the production of her action. This becomes clear when we realize that this conception does not correspond to our current scientific knowledge about the production of human action. Accepting this, I then propose a different conception of agents that does not allow for the Disappearing Agent problem to rise.
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Bahar, Shanjani Mina. "A Multi-Agent System with Negotiation Agents for E-Trading of Securities." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-188172.
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The financial markets have been started to get decentralized and even distributed. Consumers can now purchase stocks from their home computers without the use of a traditional broker. The dynamism and unpredictability of this domain which is continuously growing in complexity and also the giant volume of information which can affect this market, makes it one of the best potential domains to take advantage of agents. This thesis considers the main concerns of securities e-trading area in order to highlight advantages and disadvantages of multi-agent negotiating systems for online trading of securities comparing to single-agent systems. And then presents a multi-agent system design named MASTNA which considers both decision making and negotiating. The design seeks to improve the main concerns of securities e-trading such as speed, accuracy and handling complexities. MASTNA works over a distributed market and engages different types of agents in order to perform different tasks. For handling the negotiations MASTNA takes advantage of mobile negotiator agents with the purpose of handling parallel negotiations over an unreliable network (Internet).
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Masad, David P. "Agents in Conflict| Comparative Agent-Based Modeling of International Crises and Conflicts." Thesis, George Mason University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10131444.
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Inter-state conflicts are a key area of study in international relations, and have been approached with a variety of techniques, from case studies of individual conflicts, to formal analysis of abstract models and statistical investigations of all such conflicts. In particular, there are a variety of theories as to how states make decisions in the face of conflicts – such as when to threaten force, when to follow through, and when to capitulate to an opponent’s demand. Some scholars have argued that states may be viewed as rational decisionmakers, while others emphasize the role of psychological biases affecting individual leaders. Decisionmaking is challenging to study in part because of its complexity: the decisionmakers may not just be individuals but organizations, following internal procedures and reflecting institutional memory. Furthermore, the decisions are often believed to be strategic, reflecting the decisionmakers’ anticipation of multiple other actors’ potential responses to each possible decision.
In this dissertation, I demonstrate that agent-based models (ABMs) provide a powerful tool to address this complexity, and advance their use as a bridge between different methodologies. Agents in ABMs can be used to represent countries and endowed with a variety of internal decisionmaking models which can operationalize a variety of theories drawn from case studies, psychological experiments or game-theoretic analysis. The specific decision model agents utilize may be changed without altering the sub-models governing how the agents interact with one another. This allows us to simulate the same overall interactions utilizing different decisionmaking theories and observe how the outcomes differ. Furthermore, if these interactions correspond to real-world events, we may directly see how much explanatory or predictive power the outputs of the model variants provide. If one variant’s outputs correspond closer to the empirical data, it provides evidence supporting that variant’s underlying theory.
I implement two agent-based models, extending well-established prior models of international conflict: the International Interaction Game (Bueno de Mesquita and Lalman, 1992) and the Expected Utility Model (Bueno de Mesquita, 2002). For each, I start with their original agent decisionmaking models, and develop several variants grounded in relevant theories. I then instantiate the models with historic, empirically-derived data and run them forward to generate sets of simulated outcomes, which I compare to empirical data on the relevant time periods. I find that non-rational models of decisionmaking in the International Interaction Game provide similar explanatory power to the purely rational model, and yield rich satisficing behavior absent in the original model. I also find that the Expected Utility Model variant implementing a Schelling (1966)-inspired model of coercion yields richer dynamics and greater explanatory power than the original model.
In addition to providing evidence in support of particular theories and hypotheses, this work demonstrates the power of the comparative modeling methodology in studying international conflict. Future work will involve adding more statistical controls to the model output analysis, comparative analysis between the outputs of the two overall models, and extension of the decisionmaking models for each. The same methodology may also be expanded to other formal and computational models of international relations, and social science more broadly.
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Rodrigues, Tabajara Krausburg. "Constrained coalition formation among heterogeneous agents for the multi-agent programming contest." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2018. http://tede2.pucrs.br/tede2/handle/tede/8102.
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Esta disserta??o apresenta um estudo sobre forma??o de coaliz?es entre agentes heterog?neos para a competi??o de programa??o multiagente de 2017. Foi investigado e aplicado a forma??o de estruturas de coaliz?es entre agentes para resolver problemas log?sticos simulados sobre o mapa de uma cidade real. A fim de atingir o objetivo deste trabalho, foram integrados algoritmos formadores de coaliz?es na plataforma JaCaMo por meio de um artefato CArtAgO chamado CFArtefact. Foi utilizada a implementa??o provida pelo time SMART-JaCaMo (time participante da competi??o multiagente), para experimentar a forma??o de coaliz?es na competi??o. Tr?s abordagens foram avaliadas no dom?nio da competi??o em diferentes configura??es. A primeira abordagem utiliza somente aloca??o de tarefas para resolver o problema. A segunda e a terceira abordagem utilizam a t?cnica de forma??o de coaliz?es anteriormente ? aloca??o de tarefas; dentre estas abordagens, uma utiliza um algor?timo ?timo para resolver o problema e a outra um heur?stico. As an?lises dos experimentos realizados mostram que algor?timos formadores de coaliz?es podem melhorar a performance do time participante da competi??o quando a taxa de trabalhos gerados pelo simulador ? baixa. Entretanto, conforme a taxa de trabalhos aumenta, a abordagem que realiza somente aloca??o de tarefas obt?m um desempenho melhor quando comparada as demais. Mesmo a abordagem heur?stica tem desempenho pr?ximo ? abordagem ?tima para coaliz?es. Desta forma, ? poss?vel concluir que forma??o de coaliz?es possui grande valia para balancear os agentes para um conjunto de trabalhos que precisa ser completado.
This work focuses on coalition formation among heterogeneous agents for the 2017 multiagent programming contest. An agent is a computer system that is capable of independent action to achieve its goals. In order to increase the effectiveness of the agents, we can organise them into coalitions, in which the agents collaborate with each other to achieve individual or common goals. We investigate and apply coalition structure generation (the first activity of the coalition formation process) in simulated scenarios, specifically the 2017 contest scenario, where the agents forming a competing team cooperate to solve logistic problems simulated on the map of a real city. In order to achieve our goal, we integrate coalition formation algorithms into the JaCaMo platform by means of a CArtAgO artefact, named CFArtefact. We use the implementation of the SMART JaCaMo team for experimenting with the coalition formation approach in the contest scenario. We experiment on three approaches in the contest domain with different configurations. In the first, we use only a taskallocation mechanism, while the other approaches use an optimal coalition formation algorithm and a heuristic coalition formation algorithm. We conducted several experiments to compare the advantages of each approach. Our results show that coalition formation algorithms can improve the performance of a participating team when dealing with low job rates (i.e., how quickly new jobs are created by the simulation). However, as we increase the job rate, the approach using only task allocation has better performance. Even a heuristic coalition formation approach has close performance to the optimal one in that case. Coalition formation can play an important role when we aim to balance each group of agents to accomplish some particular goal given a larger team of cooperating agents.
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Nawwab, Fahd Saud. "Agents with a human touch : modeling of human rationality in agent systems." Thesis, University of Liverpool, 2010. http://livrepository.liverpool.ac.uk/1363/.
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Will it be possible to create a self-aware and reasoning entity that has the capacity for decision making similar to that we ascribe to human beings? Modern agent systems, although used today in various applications wherever intelligence is required, are not ready for applications where human rationalities are usually the only option in making important decisions in critical or sensitive situations. This thesis is a contribution to this area: a decision-making methodology is introduced to address the different characteristics that an agent should have in order to be better trusted with such critical decisions. The work begins with a study of philosophy in the literature (Chapter 2), which reveals that trust is based on emotions and faith in performance. The study concludes that a trustworthy decision has five main elements: it considers options and their likely effects; it predicts how the environment and other agents will react to decisions; it accounts for short- and long-term goals through planning; it accounts for uncertainties and working with incomplete information; and, finally, it considers emotional factors and their effects. The first four elements address decision making as a product of "beliefs"; the last addresses it as a product of "emotions". A complete discussion of these elements is provided in Section 2.1. This thesis is divided into two main parts: the first treats trust as a product of beliefs and the second treats trust as a product of emotions. The first part builds the decision-making methodology based on argumentation through a five-step approach where first the problem situation representing the actions available to the agent and their likely consequences is formulated. Next, arguments to perform these actions are constructed by instantiating an argumentation scheme designed to justify actions in terms of the values and goals they promote. These arguments are then subjected to a series of critical questions to identify possible counter arguments so that all the options and their weaknesses have been identified. Preferences are accommodated by organising the resulting arguments into an Argumentation Framework (we use Value-Based Argumentation [VAF] for this approach). Arguments acceptable to the agents will be identified through the ranking of the agent's values, which may differ from agent to agent. In the second part (Chapters 5 and 6), this methodology is extended to account for emotions. Emotions are generated based on whether other agents relevant to the situation support or frustrate the agent's goals and values; the emotional attitude toward the other agents then influences the ranking of the agent's values and, hence, influences the decision. In Chapters 4 and 6, the methodology is illustrated through an example study. This example has been implemented and tested on a software program. The experimental data and some screen shots are also given in the appendix.
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TALAMINI, JACOPO. "Artificial Intelligence Strategies in Multi-agent Reinforcement Learning and Robotic Agents Evolution." Doctoral thesis, Università degli Studi di Trieste, 2021. http://hdl.handle.net/11368/2982151.
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Most of the theoretical foundations which have contributed to shape Artificial Intelligence (AI) as we know it come from the last century.
The technological advancement of the last decades however, mainly in the form of faster parallel computation, larger memory units, and Big Data, has dramatically increased the popularity of AI within the research community.
Far from being only a pure object of research, AI has been successful in many fields of applications, and it has become deeply integrated into our daily experiences.
We live in a society in which on-demand content suggestions are tailored for each customer, where it is possible to order products online by chatting with bots.
Smart devices adapts to the owner behavior, the stock exchange brokers are algorithm based on predictive models, and the computers are able to discover new medicines and new materials.
Despite the amount of knowledge acquired on AI, there are still many aspects of it that we do not fully understand, such as the interplays within multiple autonomous agents scenarios, in which AIs learn and interact in a shared environment, while possibly being subjected to different goals.
In these scenarios the communication and the regulation of the autonomous agents are both extremely relevant aspects.
In this work we analyze in which way the language expressiveness affect how agents learn to communicate, to which extent the learned communication is affected by the scenario, and how to allow them to learn the optimal one.
We then investigate which communication strategies might be developed in different scenarios when driven by the individual goal, which might lead to improved equality in a cooperative scenario, or more inequality in a competitive one.
Another aspect that we consider is the ethics of multiple agents, to which we contribute by proposing a way to discourage unethical behaviors without disabling them, but instead enforcing a set of flexible rules to guide the agents learning.
AI success can be determined by its ability to adapt, which is an aspect that we consider in this work, relatively to the adaptation of autonomous soft robotic agents.
Soft robots are a new generation of nature-inspired robots more versatile and adaptable than the ones made of rigid joints, but the design and the control of soft robots can not be easily done manually.
To this extent we investigate the possibility of mimicking the evolution of biological beings, by adopting evolutionary meta-heuristics for optimizing these robots.
Specifically we propose to evolve a control algorithm that leverages the body complexity inherent to the soft robots through sensory data collected from the environment.
Considering the problem of designing adaptable soft robots, we propose an approach that allows to automatically synthesize robotic agents for solving different tasks, without needing to know them in advance.
Agent-based scenarios are powerful research tools that can be adopted also for approximating the behavior of biological actors.
Based on this possibility, we propose a model for the assessment of the publishing system indicators, which are currently used to evaluate authors and journals.
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Johnston, Sharon. "Double agent dilemma, the Canadian physician : patient advocate and social agent." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ64284.pdf.
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Johnston, Sharon 1972. "Double agent dilemma : the Canadian physician: patient advocate and social agent." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30308.
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This thesis considers the rationalization of health care in Canada. It focuses on the conflicting roles modern physicians play in our system, acting as both patient advocate and social agent. It begins by tracing the origin of both of these duties. It then examines the ethical, professional, and legal issues which arise in the limited circumstances where front-line physicians must participate in the rationing of health care. It offers a framework for resolving the double agent dilemma and states five interlocking recommendations which are the building blocks of the resolution.
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Cardoso, Rafael Cau? "A decentralised online multi-agent planning framework for multi-agent systems." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2018. http://tede2.pucrs.br/tede2/handle/tede/8048.
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Sistemas multiagentes freq?entemente cont?m ambientes complexos e din?micos, nos quais os planos dos agentes podem falhar a qualquer momento durante a execu??o do sistema. Al?m disso, novos objetivos podem aparecer para os quais n?o existem nenhum plano dispon?vel. T?cnicas de planejamento s?o bem adequadas para lidar com esses problemas. H? uma quantidade extensa de pesquisa em planejamento centralizado para um ?nico agente, por?m, at? ent?o planejamento multiagente n?o foi completamente explorado na pr?tica. Plataformas multiagentes tipicamente proporcionam diversos mecanismos para coordena??o em tempo de execu??o, frequentemente necess?rios em planejamento online. Neste contexto, planejamento multiagente descentralizado pode ser eficiente e eficaz, especialmente em dom?nios fracamente acoplados, al?m de garantir algumas propriedades importantes em sistemas de agentes como privacidade e autonomia. N?s abordamos esse problema ao apresentar uma t?cnica para planejamento multiagente online que combina aloca??o de objetivos, planejamento individual utilizando rede de tarefas hier?rquicas (HTN), e coordena??o em tempo de execu??o para apoiar a realiza??o de objetivos sociais em sistemas multiagentes. Especificamente, n?s apresentamos um framework chamado Decentralised Online Multi-Agent Planning (DOMAP). Experimentos com tr?s dom?nios fracamente acoplados demonstram que DOMAP supera quatro planejadores multiagente do estado da arte com respeito a tempo de planejamento e tempo de execu??o, particularmente nos problemas mais dif?ceis.
Multi-agent systems often contain dynamic and complex environments where agents? course of action (plans) can fail at any moment during execution of the system. Furthermore, new goals can emerge for which there are no known plan available in any of the agents? plan library. Automated planning techniques are well suited to tackle both of these issues. Extensive research has been done in centralised planning for singleagents, however, so far multi-agent planning has not been fully explored in practice. Multi-agent platforms typically provide various mechanisms for runtime coordination, which are often required in online planning (i.e., planning during runtime). In this context, decentralised multi-agent planning can be efficient as well as effective, especially in loosely-coupled domains, besides also ensuring important properties in agent systems such as privacy and autonomy. We address this issue by putting forward an approach to online multi-agent planning that combines goal allocation, individual Hierarchical Task Network (HTN) planning, and coordination during runtime in order to support the achievement of social goals in multi-agent systems. In particular, we present a planning and execution framework called Decentralised Online Multi-Agent Planning (DOMAP). Experiments with three loosely-coupled planning domains show that DOMAP outperforms four other state-of-the-art multi agent planners with regards to both planning and execution time, particularly in the most difficult problems.
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Mihal, Bađonski. "Adaptable Java Agents (AJA) — a Tool for Programming o f Multi-Agent Systems." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2004. https://www.cris.uns.ac.rs/record.jsf?recordId=73368&source=NDLTD&language=en.
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The main goal of this thesis is the creation o f the tool agent-oriented programming tool AJA. AJA is the acronym for Adaptable Java Agents. AJA consists o f two programming languages:- A higher-level language used for the description of the main agent parts. This language is called HADL, which is the acronym for Higher Agent Definition Language.- A lower-level language used for the programming o f the agent parts defined in HADL. This language is called Java+. It is actually Java enriched with the constructs for accessing higher-level agent parts defined in HADL.A translator from AJA to Java is implemented in the practical part o f the thesis. AJA agents have the following features: - Agent communicates with other agents using a construct called negotiation. The messages sent can be encrypted or digitally signed in order to ensure the security of the system. - Agent possesses adaptable parameters and neural nets that adapt themselves when the environment changes.- Agent has reflexes, which are the reactive component o f the agent architecture.- Agent can perform its actions parallel. Actions execution is synchronized.- Agent is accessible via Internet, because it acts as a simple HTTP server. People can use this way to communicate with an agent.- Agent has Java Swing based graphical user interface. Its owner uses this interface to communicate with the agent.- Because o f the fact that Java-i- language extends Java, it is possible to use all useful Java features in the implementation o f AJA agents (e.g. JDBC for the database access). The thesis also presents an original approach of integrating artificial intelligence techniques, such as neural nets, with a programming language. Having the artificial intelligence components as a part of the programming language runtime environment makes their use straightforward. A programmer uses the language constructs that are implemented using the artificial intelligencewithout the need for understanding their background and theory.The thesis contains eight chapters and three appendixes. In the first chapter, an overview of agents and multi-agent systems is given. The second chapter surveys existing agent-oriented programming languages and tools. The third chapter introduces AJA and describes the architecture of AJA agents. The syntax and semantics o f AJA languages HADL and Java+ is described in the fourth chapter. The fifth chapter presents adaptable AJA constructs in more details. To demonstrate and test the created tool, a case-study multi-agent system has been implemented in AJA. There are four personal digital assistant agents in the system. The sixth chapter describes the example agents and positively evaluates the tool. In the seventh chapter the related work and tools are analyzed and compared to AJA. The last chapter concludes the thesis. The first appendix describes the implementation details of the AJA to Java translator. The second appendix is a guide for the installation and usage of the implemented AJA to Java translator. Finally, the thirdappendix describes step by step how to translate, compile, run, and use the example agents. The thesis contains many references, which include almost all the most important and the most actual papers in the field. The reference list can be found at the end o f the thesis.Glavni doprinos doktorske teze je napravljeni alat za programiranje agenata AJA . AJA - Adaptabilni Java Agenti je jezički alat za programsku implementaciju agenata Sastoji se od dva programska jezika:- Jezik višeg nivoa kojim se opisuju glavne kom ponente agenta. Ovaj jezik se naziva HADL - Higher Agent Definition Language.- Jezik nižeg nivoa koji služi za implementaciju pojedinih komponenti agenta specificiranih HADL jezikom . Ovaj jezik se najava Java+, jer je on zapravo programski jezik Java obogaćen konstrukcijama pomoću kojih je moguće pristupati komponentama agenta, definisanim u jezik u HADL.AJA agent poseduje sledeće osobine:- Sigurna kom unikacija sa drugim A JA agentim a koristeći mehanizam pregovaranja, šifrovanje i digitalno potpisivanje poruka.- Mogućnost adaptiranja na promene u okruženju u kom se nalazi, koristeći neuralne mreže i adaptabilne parametre.- Reaktivnost zasnovana n a kom ponenti zvanoj refleks.- Paralelno izvršavanje akcija agenta u z njihovu internu sinhronizaciju.- D ostupnost agenta preko Interneta. Agent se ponaša kao jednostavan HTTP server. Na ovaj način se drugim osobama omogućuje da komuniciraju sa agentom .- G rafički korisnički interfejs zasnovan n a Java Swing tehnologiji- Pošto se u program iranju agenta koristi Java+, moguće je uposliti sve pogodnosti Jave, kao što su na primer pristup bazama podataka koristeći JDBC , rad sa multimedijalnim sadržajem , itd.U tezi je predstavljen i originalni pristup integrisanja tehnika veštačke inteligencije sa program skim jezikom . U građujući kom ponente veštačke inteligencije u izvršnu okolinu je z ik a čini n jihovo korišćenje veom a jednostavnim . Programer ne mora da bude ekspert iz veštačke inteligencije a da pri tome koristi konstrukcije jezika koje su implementirane pomoću veštačke inteligencije. AJA specifikacija agenta se sastoji od HADL i Java+ delova. U tezi je implementiran prevodioc kojim se A JA specifikacija prevodi u skup klasa programskog jezika Java. Implementiran je i jedan multi-agentski sistem kojim se praktično pokazuje korišćenje i mogućnosti napravljenog alata D oktorska teza sadrži i detaljan pregled oblasti o agentskpj m etodologiji. O n a kruniše višegodišnji rad kandidata i njegovog mentora u ovoj sve značajnijoj oblasti računarstva.Teza sadrži o sam glava i tri dodatka. U prvoj glavi se opisuje oblast agenata i m ulti-agentskih sistem a. Pregled postojećih agentskih program skih jezik a i alata se daje u drugoj glavi. O pis A JA agenata i njihove arhitekture je dat u trećoj glavi teze. Četvrta glava se bavi sintaksom i sem antikom oba A JA jezika: H A D L -a i Jave+. Adaptabilni elem enti A JA agenata se opisuju u petoj glavi. U šestoj glavi je opisan m ulti-agentski sistem koji j e ujed n o i prim er prim ene A JA alata. A JA se sa drugim postojećim agentskim alatim a upoređuje u sedm oj glavi. Osma glava sadrži zaključak. N a kraju se u tri dodatka detaljno opisuju im plem entacija prevodioca A JA -e u Javu, instalacija prevodioca i korišćenje napravljenog m ulti-agentskog sistema respektivno. U doktorskom radu su korišćene i navedene brojne reference kojim a su obuhvaćeni gotovo svi najznačajniji i najaktuelniji radovi iz oblasti multi-agentskih sistema. Lista referenci je navedena na kraju teze.
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Sharma, Naveen, and n/a. "A multi agent system framework for.NET." University of Canberra. Information Sciences & Engineering, 2005. http://erl.canberra.edu.au./public/adt-AUC20060726.153250.
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This thesis presents an approach to modeling Multi Agent Systems (MAS). A framework and its implementation are presented as an extension to .NET. A number of definitions of agents are evaluated for the purpose of a broad understanding of the term software agent. Software agent has been defined in MAS context and its characteristics are identified and implemented. Motivation factors for building framework for MAS have been discussed. A number of existing technologies are discussed and evaluated. A number of agent systems previously developed are also being discussed in the middle part of the thesis. A model software agent has been defined and its characteristics are divided in two basic categories essential and optional. Its implementation has been distributed into different components throughout the MAS framework. Some of these characteristics are jointly implemented by a number of components and others responsibility rest on the individual components. Detail working of the MAS framework (i.e. what to do, when to do) is explained as guide to develop MAS using MAS framework. The protocols followed by the framework components to make communication possible between them are discussed at components level. The required information for developing MAS using MAS framework are also discussed. It answers the why, when and how questions in regards to using MAS framework A case study on Dynamic Truck Scheduling (DTS) system is discussed, designed and implemented using the MAS framework. DTS System has been used as a prototype application to test and evaluate the framework. DTS also represents a model problem that can be answered by using MAS; complete in-depth details about the problem statement are discussed. It also discusses the design and implementation of the solution along with the test results of the framework. Possible future expansion is presented in light of a number of limitations known of the MAS framework. The code working behind the different components of the MAS framework is given in appendices. Some important standards of XML that are used to pass information between agents and MAS framework components are also given in the format of tables.
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Fazekas-Amphoux, Tünde. "L'héxaméthylène-bisacétamide (HMBA) et les cellules thyroïdiennes humaines et animales en culture : agent de prolifération, agent de différenciation, mode d'action ? : agent de prolifération, agent de différenciation, mode d'action ?" Aix-Marseille 2, 1997. http://www.theses.fr/1997AIX20660.
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Seelam, Aruntej. "REORGANIZATION OF MASSIVE MULTIAGENT SYSTEMS: MOTL/O." Available to subscribers only, 2009. http://proquest.umi.com/pqdweb?did=1966550041&sid=3&Fmt=2&clientId=1509&RQT=309&VName=PQD.
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Gill, Martin L. "Combining MAS and P2P systems : the Agent Trees Multi-Agent System (ATMAS)." Thesis, University of Stirling, 2005. http://hdl.handle.net/1893/108.
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The seamless retrieval of information distributed across networks has been one of the key goals of many systems. Early solutions involved the use of single static agents which would retrieve the unfiltered data and then process it. However, this was deemed costly and inefficient in terms of the bandwidth since complete files need to be downloaded when only a single value is often all that is required. As a result, mobile agents were developed to filter the data in situ before returning it to the user. However, mobile agents have their own associated problems, namely security and control. The Agent Trees Multi-Agent System (AT-MAS) has been developed to provide the remote processing and filtering capabilities but without the need for mobile code. It is implemented as a Peer to Peer (P2P) network of static intelligent cooperating agents, each of which control one or more data sources. This dissertation describes the two key technologies have directly influenced the design of ATMAS, Peer-to-Peer (P2P) systems and Multi-Agent Systems (MAS). P2P systems are conceptually simple, but limited in power, whereas MAS are significantly more complex but correspondingly more powerful. The resulting system exhibits the power of traditional MAS systems while retaining the simplicity of P2P systems. The dissertation describes the system in detail and analyses its performance.
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Hoegh, Julie E. "Agent of change : the literary agent and contemporary British publishing and bookselling." Thesis, King's College London (University of London), 2004. https://kclpure.kcl.ac.uk/portal/en/theses/agent-of-change--the-literary-agent-and-contemporary-british-publishing-and-bookselling(ecf174ac-58aa-4b2b-9650-9b42ddaed129).html.
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Sobol, Mor. "Principals, agents and neighbours : the European Neighbourhood Policy through a Principal-Agent lens." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/15861.
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The thesis tests the efficacy of Principal-Agent (PA) theory in explaining the creation and development of the European Neighbourhood Policy (ENP). As such, the thesis is subject as well as theory-driven. Empirically, the focal point is how the interaction between the EU member states and the European Commission affected the development of the ENP. It is a theme which is largely overlooked in the ENP literature. In terms of theory, the ENP represents a fascinating case study for PA analysis not only because it has rarely been applied to the field of EU foreign policy but also because PA has seldom been used for studying the evolution of a policy (both pre and post-delegation). Conceptualising EU member states as principals and the European Commission as agent, the thesis examines PA dynamics through the following three ENP policy stages: formulation (2002-2004), finalisation (2004-2006), and implementation (2007-2009). Three hypotheses are tested for each stage of the ENP. Two hypotheses are rooted in PA scholarship, and address the influence of the agent as an informal agenda-setter, while the third distinguishes the agent's influence between different stages of the policy development. Methodologically, the research design is based on within-case process-tracing while the empirical data is drawn from a triangulation of official documents, secondary sources and elite interviews. The thesis findings show that during the initial stages of the policy, the Commission took advantage of its favourable position (e.g. informational asymmetries and uncertainty among the member states) to establish itself as the key actor in the ENP. As the ENP evolved, the Commission’s influence has diminished while the member states, collectively and individually, became more engaged in determining the course of the policy. However, contrary to PA assumptions, member states' increased oversight over the Commission did not come as a response to disobedient behaviour. Based on the empirical data, the Commission, as an agent, was in fact trying to implement the ENP following the guidelines which were previously agreed by its principals. Thus, in the case of the ENP, my PA analysis shifts from the traditional inquiry of how principals control opportunistic agents, to examining how principals could hinder the work of the agent. This phenomenon, broadly defined by Thompson (2007) as the ‘principal problem’, is an anomaly in existing PA literature dominated by an agency-biased standpoint and has previously not been analysed in the context of the European Union. Finally, the wider implication of this thesis is that there is still room for broadening the scope of PA analysis while highlighting the necessity to keep a watchful eye on both the principals and the agent.
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Lipperts, Steffen Richard Goswin. "Mobile agent support services." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964753065.
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Braña, García Irene. "Anticancer targeted agent combination." Doctoral thesis, Universitat Autònoma de Barcelona, 2017. http://hdl.handle.net/10803/457506.
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Las toxicidades limitantes de dosis fuero una neutropenia febril grado 4 (en el brazo de docetaxel) y una neutropenia grado 3 en el brazo de gemcitabina. La combinación de carlumab no tuvo un impacto
El cáncer es una enfermedad altamente frecuente y con alta mortalidad. El desarrollo de fármacos contra el cáncer se ha caracterizado por su ineficiencia, con una de las tasas de aprobación de fármacos más baja entre las diferentes especialidades médicas. El principal motivo de esta baja tasa de éxito es la falta de eficacia de los nuevos fármacos que entran al desarrollo clínico. Se han planteado diferentes estrategias para mejorar la eficiencia del desarrollo de fármacos, incluyendo la combinación de fármacos antitumorales, el desarrollo en paralelo de biomarcadores y la optimización del diseño de los ensayos clínicos usando modelización basada en farmacocinética y farmacodinamia
Esta tesis es un compendio de dos artículos que evalúan estrategias para optimizar el desarrollo de fármacos mediante la combinación de agentes antitumorales. El primer proyecto es la evaluación preclínica en xenoinjertos derivados de pacientes (PDX) la combinación de inhibidores de PI3K-mTOR con diferentes agentes antitumorales y el segundo es el ensayo clínico fase I evaluando carlumab, un anticuerpo anti CCL2, en combinación con diferentes quimioterapias en pacientes con tumores sólidos avanzados.
Proyecto 1: se seleccionaron tres modelos de PDX con deficiencia en PTEN: un PDX de cáncer de mama triple negativo (TNBC), otro de carcinoma de ovario de bajo grado KRAS G12R mutado y otro de adenocarcinoma de pulmón con mutaciones en KRAS G12C y TP53 R181P. En estos modelos se evaluaron dos inhibidores de PI3K-mTOR—PF-04691502 and PF-05212384— en combinación con cisplatino, paclitaxel o dacomitinib.
La adición de los inhibidores de PI3K-mTOR a cisplatino o paclitaxel aumentó la actividad de la quimioterapia en los modelos de TNBC y LGSOC; sin embargo, no se objetivó este efecto en modelo de adenocarcinoma de pulmón con mutación de KRAS y TP53. Se objetivó modulación farmacodinámica de pAKT y pS6 en los grupos tratados con inhibidores de PI3K-mTOR.
Nuestra investigación sugiere que añadir un inhibidor de PI3K-mTOR puede aumentar el efecto inhibitorio sobre el crecimiento de la quimioterapia en modelos PDX con deficiencia en PTEN. Sin embargo, este beneficio no se observó en el modelo de adenocarcinoma KRAS y TP53 mutado. En el futuro se deberá ahondar en el papel de la pérdida de PTEN en la actividad de estas combinaciones.
Proyecto 2: se trata de un ensayo clínico fase Ib evaluando carlumab, un anticuerpo monoclonal contra CCL-2, en combinación con cuatro regímenes de quimioterapia (docetaxel, gemcitabina, carboplatino + paclitaxel y doxorrubicina liposomal pegilda (PLD). En este estudio participaron 53 pacientes en los que o bien los agentes quimioterápicos eran parte del tratamiento convencional o no tenían otras opciones de tratamiento convencional: docetaxel (n=15), gemcitabina (n=12), carboplatino + paclitaxel (n=12) y PLD (n=14).
Las toxicidades limitantes de dosis incluyeron una neutropenia febril grado 4 (en el brazo de docetaxel) y una neutropenia grado 3 (en el brazo de gemcitabina). De acuerdo a los brazos de tratamiento, las toxicidades grado 3 o mayores más frecuentes fueron: neutropenia (6/15) y neutropenia febril (4/15) en el brazo de docetaxel, neutropenia (2/12) en el brazo de gemcitabina, neutropenia (4/12), trombocitopenia (4/12) y anemia (2/12) en el brazo de carboplatino-paclitaxel y anemia (3/14) y mucositis (2/14) en el brazo de PLD. Se objetivo una respuesta parcial y 18 estabilizaciones de la enfermedad (38%).
La adición de carlumab no tuvo cambios relevantes en el perfil farmacocinético de ninguna de las quimioterapias evaluadas. Los niveles de CCL2 libres descendieron inmediatamente tras el tratamiento con carlumab, pero aumentaron con las administraciones posteriores, sugiriendo que carlumab secuestraba CCL2 de manera temporal. No se objetivaron anticuerpos anti-droga que justificasen dicho efecto. No se objetivaron cambios en las células tumorales circulantes ni en las células circulantes endoteliales. En 3 de 19 pacientes evaluables se objetivó una reducción del 30% en los niveles de N-telopeptido de colágeno tipo I en orina (uNTx).
Carlumab es seguro administrado a dosis de 10 o 15 mg/kg en combinación con quimioterapia convencional y tiene buena tolerancia. Sin embargo, no se alcanza una inhibición sostenida de CCL2, ni se han objetivado un número de respuestas significativas.Cancer is a highly frequent disease associated to high mortality. Drug development in Oncology has shown to be inefficient, having one of the lowest success rate of drugs entering in phase I trials that finally achieves marketed authorization. The main reason for this high failure rate is lack of efficacy. Different strategies have been adopted to improved anti-cancer drug development with the aim of improving patient care. This strategies include the combinatorial use of agents, biomarker co-development, and optimization of clinical trial design with the use of pharmacokinetic-pharmacodynamic modeling. This thesis is presented as compendium of work integrating two projects; the first project preclinically evaluates the combination of two PI3K-mTOR inhibitors and chemotherapy or the pan-HER inhibitor dacomitinib in patient derived xenografts. The second project evaluates de monoclonal antibody anti-CCL2 carlumab in patient derived xenografts. Project 1: Three PDXs were selected for their lack of PTEN expression by immunohistochemistry: a triple-negative breast cancer (TNBC), a KRAS G12R low-grade serous ovarian cancer (LGSOC), and KRAS G12C and TP53 R181P lung adenocarcinoma (LADC). Two dual PI3K-mTOR inhibitors were evaluated—PF-04691502 and PF-05212384—in combination with cisplatin, paclitaxel, or dacomitinib. The addition of PI3K-mTOR inhibitors to cisplatin or paclitaxel increased the activity of chemotherapy in the TNBC and LGSOC models; whereas no added activity was observed in the LADC model. Pharmacodynamic modulation of pS6 and pAKT was observed in the group treated with PI3K-mTOR inhibitor. Our research suggests that the addition of a PI3K-mTOR inhibitor may enhance tumor growth inhibition when compared to chemotherapy alone in PTEN-deficient PDXs. However, this benefit was absent in the KRAS and TP53 mutant LADC model. The role of PTEN deficiency in the antitumor activity of these combinations should be further investigated in the clinic. Project 2 is a first-in-human phase 1b study of carlumab with one of four chemotherapy regimens (docetaxel, gemcitabine, paclitaxel+carboplatin, and pegylated liposomal doxorubicin HCl [PLD]). Fifty-three patients with advanced solid tumors for which ≥1 of these regimens was considered standard of care or for whom no other treatment options existed participated in the study: docetaxel (n=15), gemcitabine (n=12), paclitaxel or carboplatin (n=12), or PLD (n=14). Dose-limiting toxicities included one grade 4 febrile neutropenia (docetaxel arm) and one grade 3 neutropenia (gemcitabine arm). The most common drug-related grade ≥3 adverse events were docetaxel arm—neutropenia (6/15) and febrile neutropenia (4/15); gemcitabine arm—neutropenia (2/12); paclitaxel+carboplatin arm—neutropenia, thrombocytopenia (4/12 each), and anemia (2/12); and PLD arm—anemia (3/14) and stomatitis (2/14). One partial response and 18 (38 %) stable disease responses were observed. Combination treatment with carlumab had no clinically relevant pharmacokinetic effect on any of the chemotherapeutic agents tested. Free CCL2 declined immediately post-treatment with carlumab but increased with further chemotherapy administrations in all arms, suggesting that carlumab could sequester CCL2 for only a short time. Neither antibodies against carlumab nor consistent changes in circulating tumor cells (CTCs) or circulating endothelial cells (CECs) enumeration were observed. Three of 19 evaluable patients showed a 30 % decrease from baseline urinary cross-linked N-telopeptide of type I collagen (uNTx). Carlumab could be safely administered at 10 or 15 mg/kg in combination with standard-of-care chemotherapy and was well-tolerated, although no long-term suppression of serumCCL2 or significant tumor responses were observed.
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Steindórsson, Ólafur B. "Kollektivet som autonom agent." Thesis, Linköping University, Department of Culture and Communication, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-58973.
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Holmgren, Helena. "A Daemon Remembrance Agent." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-168654.
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A rememberance agent is meant to supplement its user’s memory by suggesting previously seen material that may be relevant in the current context. The remembrance agent concept was developed by a research group at the MIT Media Lab led by Bradley Rhodes, while the Daemon environment was developed by the Software Technology research group at Ericsson Radio Systems. The goal of this master’s thesis is to combine these two ideas. Other objectives are to look into the charateristics of a remembrance agent’s user interface, and to try to find out to what extent a remembrance agent can be made platform and application independent.En remembrance agent, eller komihågagent på svenska, är tänkt att stödja sin användares minne genom att föreslå material användaren sett förut som kan vara relevant i användarens nuvarande sammanhang. Komihågagent-konceptet utvecklades av en forskargrupp på MIT under ledning av Bradley Rhodes, medan Daemon-miljön utvecklades av forskningsgruppen Software Technology på Ericsson Radio Systems. Målet med det här examensarbetet är att kombinera de två ideerna. Ett annat mål är att titta på vilka karaktäristiska drag ett användargränssnitt för en komihågagent ska ha, samt i vilken utsträckning en komihågagent kan göras plattformsoberoende.
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Schanche, Anders. "Human - Virtual Agent Interaction." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-17181.
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This thesis was carried out at Imagination Studios in Uppsala. IMS is a motion capture studio that alsodoes animation. Motion capture is the capturing of (generally) human motions to make 3Danimations look more realistic. In motion capture, the actors have to imagine the scene. The goal ofthis thesis is to help the motion capture actor by creating a tool that lets the actor interact with avirtual agent that represents his acting partner. Scenarios and a video sketch were created todescribe how the interaction can work. The Microsoft Kinect is used to capture the motions of theactor and recognize gestures. These gestures are then responded to by a virtual agent that isdisplayed in a 3D environment created in the Unreal Development Kit. Programming was done in C++and UnrealScript to make this solution work. Motions were recorded and applied to the virtual agentto create realistic animations that are played in response to the actor's gestures. The final product isan interactive application that can be used to immerse a person in an acting scenario.
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Uchyigit, G. "Agent-based recommender systems." Thesis, Imperial College London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429341.
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Guerin, Francis. "Specifying agent communication languages." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289807.
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