Дисертації з теми "Information update system"
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Abrahamsson, David. "Security Enhanced Firmware Update Procedures in Embedded Systems." Thesis, Linköping University, Department of Computer and Information Science, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-16914.
Повний текст джерелаMany embedded systems are complex, and it is often required that the firmware in these systems are updatable by the end-user. For economical and confidentiality reasons, it is important that these systems only accept firmware approved by the firmware producer.
This thesis work focuses on creating a security enhanced firmware update procedure that is suitable for use in embedded systems. The common elements of embedded systems are described and various candidate algorithms are compared as candidates for firmware verification. Patents are used as a base for the proposal of a security enhanced update procedure. We also use attack trees to perform a threat analysis on an update procedure.
The results are a threat analysis of a home office router and the proposal of an update procedure. The update procedure will only accept approved firmware and prevents reversion to old, vulnerable, firmware versions. The firmware verification is performed using the hash function SHA-224 and the digital signature algorithm RSA with a key length of 2048. The selection of algorithms and key lengths mitigates the threat of brute-force and cryptanalysis attacks on the verification algorithms and is believed to be secure through 2030.
Law, King Yiu. "Two routing strategies with cost update in integrated automated storage and retrieval system /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?IELM%202007%20LAW.
Повний текст джерелаKuhn, Olivier. "Methodology for knowledge-based engineering template update : focus on decision support and instances update." Phd thesis, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00713174.
Повний текст джерелаMoore, Jennifer Anne. "Image Integration and On-Screen Digitizing Method of Geographic Information System Update and Maintenance Applied to the Hofmann Forest." NCSU, 2002. http://www.lib.ncsu.edu/theses/available/etd-20020419-104500.
Повний текст джерелаThe Hofmann Forest is a self-sustaining forest that provides the North Carolina State University College of Natural Resources with support for research, education, and extension service. The management of the Hofmann Forest requires data concerning historical records, complete and current resource inventory, and the ability to model future forest conditions. A geographic information system (GIS) database was created for the Hofmann Forest in 1992 to facilitate achievement of these data objectives. The database was not maintained or used regularly. Ongoing forestry research and silvicultural activities are constantly changing the resource conditions on the forest. This research examined a practical and accurate method for maintaining currency in the GIS database. Digital imagery was integrated into the original GIS database, and silvicultural records were used to update the existing data layers. Digital orthophotography, in the form of USGS Digital Orthophoto Quarter-Quads (DOQQs), was the primary source of imagery, but where the imagery was unavailable or contained insufficient spatial detail, unrectified aerial photographs were scanned, registered, and substituted. For the vegetation data layer of the GIS, spatial and attribute updates were completed and evaluated for silvicultural operations covering over three thousand acres. Some updates involved only changes in attributes. Spatial updates were completed with the digital orthophotography or digital aerial photographs; of these, some updates involved fairly simple spatial editing and others involved more complex spatial editing. The updates required the digital aerial photographs were all spatially complex edits. Acreage estimates accompanied the silvicultural records. GIS-derived area measurements were compared with those on the silvicultural records. There was not a significant difference between the two measures of area, however some discrepancies were present. A series of comparison tests were designed and performed to identify the potential elements of the area discrepancies. Spatial complexity of the editing procedure, different sources of digital imagery, and size of updated vegetation polygons were all examined. Degree of spatial complexity in the updates did not significantly contribute to area discrepancies. There was no significant difference in area discrepancies when either the DOQQs or digital aerial photographs were used. Size of the updated vegetation polygons was significantly negatively correlated with the discrepancies, showing that small absolute differences in area in small polygons result in large relative discrepancy values. Differentially corrected global positioning system (GPS) data were used to assess the horizontal positional accuracy of the GIS data layers. Following National Map Accuracy Standard (NMAS) guidelines, a sample of 25 ?well-defined? locations were collected using a Trimble GPS Pathfinder ProXR receiver with real-time differential correction capabilities. These same locations were identified on the Roads layer of the GIS database, the DOQQs, and the digital aerial photography. Root mean-square error (RMSE) was calculated for each of the different data layers, using the GPS data as reference locations. Only the DOQQ-derived points met the NMAS Class 2 horizontal positional accuracy standard. RMSE for the aerial photography and Roads layer were greater than the limiting RMSE for the NMSE Class 3 standard. Based on these results, it can be concluded that DOQQs possess greater horizontal accuracy than the digital aerial photography and are the preferred imagery source for the on-screen digitizing. Should greater resolution be required for a database update, orthorectification of the digital aerial photography could be used to correct horizontal positional errors. Recently, software packages have become available to orthorectify aerial photographs effectively and affordably.The presence of extraneous features in the vegetation layer of the GIS database almost certainly contributes to the area discrepancies. Features such as windrows, fire ponds, and logging decks are included in vegetation polygon area but not silvicultural record area estimates. Future database improvements should consider subtracting these features (and their associated areas) from the vegetation layer and creating separate database layers for each type of feature. A methodology report was developed to accompany the GIS database as a reference for future updating. Continuous maintenance of the Hofmann Forest GIS database is necessary to provide timely information for on-site forest managers and research activities, and to preserve an account of forest conditions that may be useful in present and future management decisions. On-screen digitizing with integrated digital imagery proved to be a feasible method for updating and maintaining the Hofmann Forest GIS database.
Sommerlot, Andrew Richard. "Coupling Physical and Machine Learning Models with High Resolution Information Transfer and Rapid Update Frameworks for Environmental Applications." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/89893.
Повний текст джерелаPHD
Bedewy, Ahmed M. "OPTIMIZING DATA FRESHNESS IN INFORMATION UPDATE SYSTEMS." The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1618573325086709.
Повний текст джерелаSang, Yu. "INFORMATION-UPDATE SYSTEMS: MODELS, ALGORITHMS, AND ANALYSIS." Diss., Temple University Libraries, 2019. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/576162.
Повний текст джерелаPh.D.
Age of information (AoI) has been proposed as a new metric to measure the staleness of data. For time-sensitive information, it is critical to keep the AoI at a low level. A lot of work have been done on the analysis and optimization on AoI in information-update systems. Prior studies on AoI optimization often consider a push model, which is concerned about when and how to "push" (i.e., generate and transmit) the updated information to the user. In stark contrast, we introduce a new pull model, which is more relevant for certain applications (such as the real-time stock quotes service), where a user sends requests to the servers to proactively "pull" the information of interest. Moreover, we propose to employ request replication to reduce the AoI. Interestingly, we find that under this new Pull model, replication schemes capture a novel tradeoff between different levels of information freshness and different response times across the servers, which can be exploited to minimize the expected AoI at the user's side. Specifically, assuming Poisson updating process for the servers and exponentially distributed response time with known expectation, we derive a closed-form formula for computing the expected AoI and obtain the optimal number of responses to wait for to minimize the expected AoI. Then, we extend our analysis to the setting where the user aims to maximize the utility, which is an exponential function of the negative AoI and represents the user's satisfaction level about the timeliness of the received information. We can similarly derive a closed-form formula of the expected utility and find the optimal number of responses to wait for. Further, we consider a more realistic scenario where the updating rate and the mean response time at the servers are unknown to the user. In this case, we formulate the utility maximization problem as a stochastic Multi-Armed Bandit (MAB) Problem. The formulated MAB problem has a special linear feedback graph, which can be leveraged to design policies with an improved regret upper bound. We also notice that one factor has been missing in most of the previous solutions on AoI minimization, which is the cost of performing updates. Therefore, we focus on the tradeoff between the AoI and the update cost, which is of significant importance in time-sensitive data-driven applications. We consider the applications where the information provider is directly connected to the data source, and the clients need to obtain the data from the information provider in a real-time manner (such as the real-time environmental monitoring system). The provider needs to update the data so that it can reply to the clients' requests with fresh information. However, the update cost limits the frequency that the server can refresh the data, which makes it important to design an efficient policy with optimal tradeoff between data freshness and update cost. We define the staleness cost, which reflects the AoI of the data and formulate the problem as the minimization over the summation of the update cost and the staleness cost. We first propose important guidelines of designing update policies in such information-update systems that can be applied to arbitrary request arrival processes. Then, we design an update policy with a simple threshold-based structure, which is easy to implement. Under the assumption of Poisson request arrival process, we derive the closed-form expression of the average cost of the threshold-based policy and prove its optimality among all online update policies. In almost all prior works, the analysis and optimization are based on traditional queueing models with the probabilistic approaches. However, in the traditional probabilistic study of general queueing models, the analysis is heavily dependent on the properties of specific distributions. Under this framework, it is also usually hard to handle distributions with heavy tail behavior. To that end, in this work, we take an alternative new approach and focus on the Peak Age of Information (PAoI), which is the largest age of each update shown to the end users. Specifically, we employ a recently developed analysis framework based on robust optimization and model the uncertainty in the stochastic arrival and service processes by uncertainty sets. This robust queueing framework enables us to approximate the steady-state PAoI performance of information-update systems with very general arrival and service processes, including those exhibiting heavy-tailed behavior. We first propose a new bound of the PAoI under the single-source system that performs much better than previous results, especially with light traffic. Then, we generalize it to multi-source systems with symmetric arrivals, which involves new technical challenges. It has been extensively investigated for various queueing models based on the probabilistic approaches. However, in the traditional probabilistic study of general queueing models, the analysis is heavily dependent on the properties of specific distributions, such as the memoryless property of the Poisson distribution. Under this framework, it is also usually hard to handle distributions with heavy tail behavior. To that end, we take an alternative new approach and focus on the Peak Age of Information (PAoI), which is the largest age of each update shown to the end users. Specifically, we employ a recently developed analysis framework based on robust optimization and model the uncertainty in the stochastic arrival and service processes by uncertainty sets. This robust queueing framework enables us to approximate the steady-state PAoI performance of information-update systems with very general arrival and service processes, including those exhibiting heavy-tailed behavior. We first propose a new bound of the PAoI under the single-source system that performs much better than previous results, especially with light traffic. Then, we generalize it to multi-source systems with symmetric arrivals, which involves new technical challenges.
Temple University--Theses
Weinlichová, Jana. "Návrh algoritmů pro modul informačního systému." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228040.
Повний текст джерелаThuresson, Marcus. "Wrapping XML-Sources to Support Update Awareness." Thesis, University of Skövde, Department of Computer Science, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-488.
Повний текст джерелаData warehousing is a generally accepted method of providing corporate decision support. Today, the majority of information in these warehouses originates from sources within a company, although changes often occur from the outside. Companies need to look outside their enterprises for valuable information, increasing their knowledge of customers, suppliers, competitors etc.
The largest and most frequently accessed information source today is the Web, which holds more and more useful business information. Today, the Web primarily relies on HTML, making mechanical extraction of information a difficult task. In the near future, XML is expected to replace HTML as the language of the Web, bringing more structure and content focus.
One problem when considering XML-sources in a data warehouse context is their lack of update awareness capabilities, which restricts eligible data warehouse maintenance policies. In this work, we wrap XML-sources in order to provide update awareness capabilities.
We have implemented a wrapper prototype that provides update awareness capabilities for autonomous XML-sources, especially change awareness, change activeness, and delta awareness. The prototype wrapper complies with recommendations and working drafts proposed by W3C, thereby being compliant with most off-the-shelf XML tools. In particular, change information produced by the wrapper is based on methods defined by the DOM, implying that any DOM-compliant software, including most off-the-shelf XML processing tools, can be used to incorporate identified changes in a source into an older version of it.
For the delta awareness capability we have investigated the possibility of using change detection algorithms proposed for semi-structured data. We have identified similarities and differences between XML and semi-structured data, which affect delta awareness for XML-sources. As a result of this effort, we propose an algorithm for change detection in XML-sources. We also propose matching criteria for XML-documents, to which the documents have to conform to be subject to change awareness extension.
Biondi, Mattia. "An Updated Emulated Architecture to Support the Study of Operating Systems." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20751/.
Повний текст джерелаFarazi, Shahab. "Age of Information in Multi-Hop Status Update Systems: Fundamental Bounds and Scheduling Policy Design." Digital WPI, 2020. https://digitalcommons.wpi.edu/etd-dissertations/593.
Повний текст джерелаGuo, Yuxin. "Automatic Updates in the Sensible Things Platform." Thesis, Mittuniversitetet, Avdelningen för informations- och kommunikationssystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-25502.
Повний текст джерелаWang, Xiwei. "Data Privacy Preservation in Collaborative Filtering Based Recommender Systems." UKnowledge, 2015. http://uknowledge.uky.edu/cs_etds/35.
Повний текст джерелаLeng, Christof Verfasser], Alejandro P. [Akademischer Betreuer] [Buchmann, Bettina [Akademischer Betreuer] Kemme, and Klaus [Akademischer Betreuer] Wehrle. "BubbleStorm: Replication, Updates, and Consistency in Rendezvous Information Systems / Christof Leng. Betreuer: Alejandro P. Buchmann ; Bettina Kemme ; Klaus Wehrle." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2012. http://d-nb.info/110611731X/34.
Повний текст джерелаBergmark, Max. "Designing a performant real-time modular dynamic pricing system : Studying the performance of a dynamic pricing system which updates in real-time, and its application within the golfing industry." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-276241.
Повний текст джерелаI många industrier räknas priset för produkterna ut dynamiskt för att maximera intäkterna samtidigt som kundnöjdheten bibehålls. I denna rapport så undersökt en metod för realtidsberäkningar av priser i en dynamisk kontext, där kunder alltid får uppdaterade priser. Den vanligaste metoden för dynamisk prissättning idag är att uppdatera priserna i systemet med jämna intervall, och sedan presentera det senast uträknade priset till kunden. Att använda periodiska prisuppdateringar leder till snabba responstider, och vanligtvis tillräckligt hög exakthet vad gäller pris. Men om det dynamiska prissättningssystemet kan dra nytta av väldigt snabba prisuppdateringar, så kan en onlineberäkning vara en bättre metod för att öka exaktheten för priserna. Den huvudsakliga fördelen av detta tillvägagångssätt är att det kombinerar kortsiktig exakthet med långsiktig stabilitet. På kort sikt så hanteras prisändringar av en onlineberäkning med realtidsuppdateringar, medan större trender hanteras av statistisk analys av tidigare bokningsbeteenden, som kondenseras till en efterfrågekurva. I denna rapport så beskrivs den långsiktiga statistiska analysen i kombination med den kortsiktiga onlineberäkningen, och hur denna kombination kan vara positiv både för säljare och köpare.
Larkin, Devitt. "Aligning with the rapidly shifting technological goalposts : the review and update of the RIMPA technology survey." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2012. https://ro.ecu.edu.au/theses/516.
Повний текст джерелаErsson, Lucas. "Facilitating More Frequent Updates: Towards Evergreen : A Case Study of an Enterprise Software Vendor’s Response to the Emerging DevOps Trend, Drawing on Neo-Institutional Theory." Thesis, Linköpings universitet, Informatik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-155785.
Повний текст джерелаIdris, Muhammad. "Real-time Business Intelligence through Compact and Efficient Query Processing Under Updates." Doctoral thesis, Universite Libre de Bruxelles, 2019. https://dipot.ulb.ac.be/dspace/bitstream/2013/284705/5/contratMI.pdf.
Повний текст джерелаDoctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
Fu, Ju-Hsien, and 傅茹舷. "English Vocabulary Learning System Based on Memory Cycle Update and Contextual Information." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/38451219201948375514.
Повний текст джерела國立成功大學
工程科學系碩博士班
97
Vocabulary learning is one of the major impact factors in English learning. One way to approach this learning task is to undertake extensive reading of English articles. For promoting vocabulary learning in an extensive reading environment, providing multiple-choice glosses while reading is a widely studied technique. The reason is that multiple-choice glosses can connect both advantages of vocabulary glosses and meaning inferring. Besides, many scholars investigate using the feedback of the vocabulary test to update the memory cycle of the vocabulary on improving vocabulary learning. This thesis proposed an English vocabulary learning system with an extensive reading environment. The system can update memory cycles of vocabularies of a learner through the feedback of multiple-choice glosses successfully and promote the learner’s vocabulary abilities in a limited period. Furthermore, an indirect memory cycle update method is also presented in the thesis to adjust memory cycles according to contextual information, and the indirect memory cycle update method can decrease number of test times and allow the vocabularies that need to be reviewed appearing more precisely.
Leng, Christof. "BubbleStorm: Replication, Updates, and Consistency in Rendezvous Information Systems." Phd thesis, 2012. http://tuprints.ulb.tu-darmstadt.de/3078/1/phd-thesis-leng-tuprints.pdf.
Повний текст джерелаCHANG, YI-CHING, and 張倚菁. "Applying Updated Information System Success Model (Updated ISSM) to Explore the Benefit Analysis of Taiwan Enterprises on ERP Implementation." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/54uxv4.
Повний текст джерела中華大學
資訊管理學系
105
The purpose of this study is to construct a framework to explore the benefit analysis of Taiwan Enterprises on ERP(Enterprise Resource Planning) implementation. Previous researches in ERP, scholars focused on user satisfaction, case studies and key influential factors of ERP implementation. While as the rapid competitive changes of business environment, information system for most of enterprises should be modified. Nevertheless, rare studies explored benefit analysis of ERP by updated ISSM (updated Information System Success Model). This study adopts amended ISSM and Expected Confirmation Theory to explore the benefit analysis of Taiwan enterprises on ERP implementation. Data were collected from 206 ERP system users by using SPSS. The results of this study demonstrate that the quality of information system has positive impact on both quality of information and users’ satisfaction of information; quality of service provided has positive impact on information quality and users’ satisfaction of information; the degrees of expected confirmation by users have positive impact on users’ satisfaction of information and users’ satisfaction of information has positive impact on individual benefit and organizational benefit. This study recommends that the reliability and stability of ERP system, along with the professional images and problem-solving abilities of the ERP suppliers should be considered as the priority while implementing ERP system. On the other hand, with the purpose of advancing users’ sustaining uses, the ERP suppliers should to increase the dependency of system, raise the closed interaction between informational supervises and the ability of problem-solving.
ThuNguyen, Phuong Ha, and 阮芳夏書. "The Impact of Updated AIS (Accounting Information System)’s Appropriation on Accounting Process Performance under New IFRS." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/5ep9d9.
Повний текст джерелаWu, Ssu-wei, and 吳斯維. "A Study on Job Performance of Second-Generation Document Management System Based on Updated Information Systems Success Model for Civil Servants in New Taipei City." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/32365736954392234201.
Повний текст джерела世新大學
資訊傳播學研究所(含碩專班)
103
New Taipei City Government cooperates with the central policy to build the second generation document management system in order to achieve the documents electronically. The system changes the way how the civil servants deal with official business. This study aims to understand the influence of System quality on user satisfaction and analyze the correlation between users’ satisfaction and job performance. The study surveyed civil servants in District Offices of New Taipei City through questionnaires and statistical analysis. There are 457 copies of valid questionnaires in total. Descriptive statistical survey conducted by the statistical software package SPSS version 21.0, Independent-Samples t Test, One-way ANOVA, Pearson product-moment correlation coefficient, Regression Analysis, synthesis summarized the following conclusions: System quality, service quality and information quality have a positive impact on user satisfaction, and user satisfaction with the performance of civil servants has a positive correlation.
Van, der Westhuizen Petra Laura. "Control room agents : an information-theoretic approach." Thesis, 2007. http://hdl.handle.net/10500/2211.
Повний текст джерелаSchool of Computing
Ph. D. (Computer Science)
Idris, Muhammad. "Real-time Business Intelligence through Compact and Efficient Query Processing Under Updates." 2018. https://tud.qucosa.de/id/qucosa%3A33726.
Повний текст джерелаSchenk, Franz. "An Active Domain Node Architecture for the Semantic Web." Doctoral thesis, 2008. http://hdl.handle.net/11858/00-1735-0000-0006-B3B7-3.
Повний текст джерела