Готові списки джерел за темами / Radio link design

Добірка наукової літератури з теми "Radio link design"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 29 січня 2023

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями

Оберіть тип джерела:

Зміст

Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Radio link design".

Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.

Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.

Статті в журналах з теми "Radio link design"

1

Yarkoni, N., N. Blaunstein, and D. Katz. "Link budget and radio coverage design for various multipath urban communication links." Radio Science 42, no. 2 (April 2007): n/a. http://dx.doi.org/10.1029/2005rs003345.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Kanai, Toshihito. "Exact radio link design in cellular mobile communication systems." Electronics and Communications in Japan (Part I: Communications) 72, no. 6 (June 1989): 46–54. http://dx.doi.org/10.1002/ecja.4410720605.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Choi, Hyo-Ki, Ho-Joon Jang, Young-Hwan Song, Dhong-Woon Jang, Jae-Woo Joo, and Nan-Sol Seo. "Radio Link Modem System Architecture Design for Korean Tactical Data Link System Implementation." Journal of the Korea Institute of Military Science and Technology 16, no. 6 (December 5, 2013): 789–96. http://dx.doi.org/10.9766/kimst.2013.16.6.789.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Sheikh, A. U. H., D. C. Coll, R. G. Ayers, and J. H. Bailey. "ATCS: Advanced Train Control System radio data link design considerations." IEEE Transactions on Vehicular Technology 39, no. 3 (1990): 256–62. http://dx.doi.org/10.1109/25.131007.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Wake, David, Anthony Nkansah, and Nathan J. Gomes. "Radio Over Fiber Link Design for Next Generation Wireless Systems." Journal of Lightwave Technology 28, no. 16 (August 2010): 2456–64. http://dx.doi.org/10.1109/jlt.2010.2045103.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Pérez, Percy Poquis, Brian Meneses Claudio, and Alexi Delgado. "Design of a Hot Air Balloons for Wireless Internet Transmission in Awajún Communities in Huampami, Amazonas-Perú." International Journal of Emerging Technology and Advanced Engineering 11, no. 9 (September 20, 2021): 55–65. http://dx.doi.org/10.46338/ijetae0921_07.

Повний текст джерела
Анотація:
Abstract— One of the problems that causes educational inequality is the lack of access to Internet service, this is what happens in the Awajún communities in Huampami Amazonas– Perú, a remote area abandoned by the Peruvian state where Internet access is scarce. According to the province, at the primary level, in Condorcanqui only 5.29% have access to the internet, while at the secondary level 32.43% have access to the Internet service. That is why in this research work, it is proposed to bring the internet service through a point-to-point link using hot air balloons, because this wireless technology has a better performance in terms of service availability, latency, and transmission speed. Finally, through the Radio Mobile software and Google Earth, the simulation of the point-to-point link is carried out where a line of sight is obtained as a result, which indicates that it is feasible to make a radio link, in addition a reception level of - 49.8 dBm and a distance between the two points of 7.79km, it is also determined that the hot air balloon must be at a height of 90 meters for the coverage to be greater. Keywords— Education; Point to Point Link; Radio Mobile; rural zone; radiolink
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Suwa, Keisuke, and Ryoji Kawasaki. "Radio link design and reverse link capacity on microcellular DS-CDMA wideband transmission systems." Electronics and Communications in Japan (Part I: Communications) 82, no. 9 (September 1999): 51–60. http://dx.doi.org/10.1002/(sici)1520-6424(199909)82:9<51::aid-ecja6>3.0.co;2-a.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Muñoz, Pablo, Isabel de la Bandera, Fernando Ruiz, Salvador Luna-Ramírez, Raquel Barco, Matías Toril, Pedro Lázaro, and Jaime Rodríguez. "Computationally-Efficient Design of a Dynamic System-Level LTE Simulator." International Journal of Electronics and Telecommunications 57, no. 3 (September 1, 2011): 347–58. http://dx.doi.org/10.2478/v10177-011-0047-2.

Повний текст джерела
Анотація:
Computationally-Efficient Design of a Dynamic System-Level LTE SimulatorThe Long-Term Evolution (LTE) is the next generation of current mobile telecommunication networks. LTE has a new flat radio-network architecture and a significant increase in spectrum efficiency. In this paper, a computationally-efficient tool for dynamic system-level LTE simulations is proposed. A physical layer abstraction is performed to predict link-layer performance with a low computational cost. At link layer, there are two important functions designed to increase the network capacity: Link Adaptation and Dynamic Scheduling. Other Radio Resource Management functionalities such as Admission Control and Mobility Management are performed at network layer. The simulator is conceived for large simulated network time to allow evaluation of optimization algorithms for the main network-level functionalities.
Стилі APA, Harvard, Vancouver, ISO та ін.
9

Rudinskas, Darius, Zdobyslaw Goraj, and Jonas Stankūnas. "SECURITY ANALYSIS OF UAV RADIO COMMUNICATION SYSTEM." Aviation 13, no. 4 (December 31, 2009): 116–21. http://dx.doi.org/10.3846/1648-7788.2009.13.116-121.

Повний текст джерела
Анотація:
This paper presents analyzed questions of the safety of the information transferred by the radio connection link of the Polish UAV project “Aircraft for monitoring” SAMONIT. This safety is especially important for the design and use of unmanned aerial vehicles (UAV). This paper also presents the structure of the SAMONIT communication system, security threats to the radio connection system, and possible measures to ensure secure information. Santrauka Straipsnyje nagrinejami Lenkijos bepiločiu orlaiviu projekto SAMONIT (monitoringo lektuvas) radijo ryšiu perduodamos informacijos saugumo klausimai. Ypač svarbi yra radijo ryšiu perduodamos informacijos apsauga kuriant bepiločius orlaivius (BO) ir kitas nuotolinio valdymo transporto priemones. Straipsnyje pateikiama SAMONIT ryšiu sistemos struktūra, galimos gresmes informacijos perdavimui, saugumui bei integralumui; taip pat radijo ryšio sistemos apsaugos būdai bei priemones.
Стилі APA, Harvard, Vancouver, ISO та ін.
10

Sousa, Ivo, Nuno Sousa, Maria Paula Queluz, and António Rodrigues. "Fronthaul Design for Wireless Networks." Applied Sciences 10, no. 14 (July 10, 2020): 4754. http://dx.doi.org/10.3390/app10144754.

Повний текст джерела
Анотація:
Cloud Radio Access Network (C-RAN) architectures have arisen as an alternative to traditional wireless network architectures, notably by taking advantage of the functional split between the multiple distributed Remote Radio Heads (RRHs) and the centralized Baseband Units (BBUs), through the creation of a new connectivity segment—the fronthaul. In order to maximize the investment return, it is important to find out, for this C-RAN segment, which technologies provide cost-effective solutions. This paper addresses this issue by evaluating and comparing the performance of Microwave Radio Transmission (MRT), Free Space Optics (FSO), and Fiber Optics (FO) technologies when applied to the fronthaul. First, a methodology is provided to determine the most cost-effective solution for each RRH–BBU link, as well as to compute the required number of BBUs and where they should be positioned in order to minimize the overall network costs. Next, a cost-effectiveness comparison of the aforementioned communication technologies is presented for individual fronthaul segments under different weather conditions, link lengths, and bit rate requirements. Moreover, an assessment is performed regarding the impact of the RRH density on the selection of cost-effective communication technologies for C-RANs. The obtained results allow concluding that fronthaul expenses are significantly affected by the performance of FSO systems, which in turn is affected by weather conditions; this highlights the relevance of having accurate climate statistics and forecasts in order to get the most out of the FSO technology and, consequently, lowering the overall network costs.
Стилі APA, Harvard, Vancouver, ISO та ін.
Більше джерел

Дисертації з теми "Radio link design"

1

Hamied, Khalid Abdul-Ariz. "Advanced radio link design and radio receiver design for mobile communications." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/15940.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Alam, Tasmeer. "LINK DEPENDENT ADAPTIVE RADIO – DESIGN FOR iNET." International Foundation for Telemetering, 2017. http://hdl.handle.net/10150/626995.

Повний текст джерела
Анотація:
This paper focuses on the design of a simple Time Division Multiple Access (TDMA) signaling structure for the Link Dependent Adaptive Radio (LDAR) prototype wireless radio communication system to meet the timing requirements of the iNET standard. Built for aeronautical telemetry, LDAR adapts its modulation and coding scheme based on the channel condition in real time. In this paper, a simple protocol for transmission of Command Message and Data Message between Ground Station and Test Article is discussed. This protocol includes all analysis for the continuous adaptation of modulation scheme and coding rate to maximize throughput while ensuring a minimum level of link quality. This project was a collaborative effort between Morgan State University and Georgia Tech Research Institute and is a continuation of our previously published work on LDAR.
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Volos, Haris I. "Cognitive Radio Engine Design for Link Adaptation." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/29148.

Повний текст джерела
Анотація:
In this work, we make contributions in three main areas of Cognitive Engine (CE) design for link adaptation. The three areas are CE design, CE training, and the impact of imperfect observations in the operation of the CE. First, we present a CE design for link adaptation and apply it to a system which can adapt its use of multiple antennas in addition to modulation and coding. Our design moves forward the state of the art in several ways while having a simple structure. Specifically, the CE only needs to observe the number of successes and failures associated with each set of channel conditions and communication method. From these two numbers, the CE can derive all of its functionality: estimate confidence intervals, balance exploration vs. exploitation, and utilize prior knowledge such as communication fundamentals. Finally, the CE learns the radio abilities independently of the operation objectives. Thus, if an objective changes, information regarding the radio's abilities is not lost. Second, we provide an overview of CE training, and we analytically estimate the number of trials needed to conclusively find the best performing method in a list of methods sorted by their potential performance. Furthermore, we propose the Robust Training Algorithm (RoTA) for applications where stable performance is of topmost importance. Finally, we test four key training techniques and identify and explain the three main factors that affect performance during training. Third, we assess the impact of the estimation noise on the performance of a CE. Furthermore, we derive the effect of estimation delay, in terms of the correlation between the observed SNR and the true SNR. We evaluate the effect of estimation noise and delay to the operation of the CE individually and jointly. It is found that impairments on learning make the CE more conservative in its choices leading to submaximal performance. It is found that the CE should learn using the impaired observations, if the observations are highly correlated with the actual conditions. Otherwise, it is better for the CE to learn with knowledge of the ideal conditions, if that knowledge is available.
Ph. D.
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Britto, Elizabeth, and Patricia Mwangi. "CHANNEL ISSUES FOR DESIGN OF THE iNET RADIO LINK PROTOCOL." International Foundation for Telemetering, 2005. http://hdl.handle.net/10150/604896.

Повний текст джерела
Анотація:
ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, Nevada
This paper presents the issues related to the modeling and performance of the Radio Channel used in Telemetry. Because of the physical environment one expects stressed channel conditions due to multipath, shadowing, and high doppler shift caused by high speeds of up to mach 3. Prior work has created useful data and models for analysis of these radio channels. This paper will develop features of a channel simulator that will allow for evaluation of radio protocols for iNET. Substantial work has also been done to develop requirements for the iNET networked radio environment. This paper will map these requirements into technical features required for the radio link and consider how these will relate to the effects of the channels.
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Wu, Yang. "Optical heterodyned radio-over-fiber link design using electroabsorption & electrooptic modulators /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2004. http://wwwlib.umi.com/cr/ucsd/fullcit?p3123659.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Hossain, Abu Zafar Mohammad Ekram. "Radio link control and transport layer protocol design issues in wireless IP networks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0017/NQ58572.pdf.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Aden, Hassan Abdullahi, and Källqvist Rasmus Karlsson. "Evaluating LoRa Physical as a Radio Link Technology for use in a Remote-Controlled Electric Switch System for a Network Bridge Radio-Node." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-247895.

Повний текст джерела
Анотація:
This report explores the design of a system for remotely switching electronics on and off within a range of at least 15 km, to be used with battery driven radio nodes for outdoor Wi-Fi network bridging. The application of the network bridges are connecting to remote networks, should Internet infrastructure fail during an emergency.The problem statement for the report was “What is a suitable radio link technology for use in a remote controlled electrical switch system and how should it best be put to use?” To answer the question, delimitation was done to exploring Low Power Wide Area Network (LPWAN) link technologies, due to their prior use within power constrained devices.Long Range-radio, abbreviated LoRa, is a LPWAN radio modulation technique and was determined to be a good candidate as a suitable link technology for the remote electrical switch system. The range of LoRa is achieved by drastically lowering the data rate of the transmission, and is suitable for battery-powered or energy harvesting devices such as those found in the field of Internet of Things.A LoRa-based transmitter and receiver pair was implemented, and measured to have a packet delivery ratio of over 95% at a distance of 2 km, measured between two bridges. Data at further distances could not be accurately determined, because of the LoRa transceiver giving faulty readings.No conclusion could be made about the suitability for using a LoRa based system to solve the problem, partially due to an improper method for testing the radio performance was used, and partially due to an inconclusive measurement result.
Denna rapport utforskar designen av ett system för att fjärrstyrt slå på eller av elektronik över ett avstånd på minst 15 km, för att användas med batteridrivna radionoder för nätverksbryggning utomhus med Wi-Fi. Tillämpningsområdet för nätverksbryggorna är att koppla samman avlägsna nätverk, om Internetinfrastruktur skulle sluta fungera vid en nödsituation.Problemställningen för rapporten var ”Vad är en lämplig radiolänksteknik att använda i ett fjärrstyrt elektriskt strömbrytarsystem, och hur ska det bäst brukas?”. För att svara på frågan gjordes en avgränsning att utforska Low Power Wide Area Network (LPWAN)-länktekniker, på grund av deras tidigare användning inom effektbegränsade enheter.Long Range-radio, förkortat LoRa, är en radiomodulationsteknik som används för att skicka data över långa avstånd med energibegränsade enheter. LoRa:s räckvidd uppnås genom att drastiskt sänka datatakten, och lämpar sig för bruk i batteridrivna eller energiskördande enheter, likt de som återfinns inom fältet Internet of Things.Ett LoRa-baserat sändaroch mottagarpar implementerades, och uppmättes till att ha en paketlevereringsmängd på över 95% vid ett avstånd på 2 km, mätt mellan två broar. Data vid större avstånd kunde inte bli bestämt noggrant, eftersom LoRa transceivern gav felaktiga avläsningar. Ingen slutsats kunde göras för lämpligheten för att använda ett LoRa-baserat system för att lösa problemet, delvist för att en olämplig metod för att testa radions prestanda använts, och delvist på grund av ett ofullständigt mätresultat.
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Frykskog, David, and Hjalmar Jonsson. "Construction of RF-link budget template for transceiver modelling." Thesis, Linköpings universitet, Fysik och elektroteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-162159.

Повний текст джерела
Анотація:
This master thesis report details the process of developing a simulation platform for radio transceivers with a focus on analog receiver front end system design. The platform was implemented in the National Instruments VSS environment for the company Ericsson AB.
Стилі APA, Harvard, Vancouver, ISO та ін.
9

Benzerbadj, Ali. "Approche inter-couches pour l'économie d'énergie et la fiabilité dans les Réseaux de Capteurs Sans Fil dédiés aux Applications Critiques de Surveillance." Thesis, Brest, 2018. http://www.theses.fr/2018BRES0034/document.

Повний текст джерела
Анотація:
Les Réseaux de Capteurs Sans Fil (RCSFs) constituent une classe particulière des réseaux Ad hoc, faisant l'objet de recherches intensives. Ils sont considérés comme un outil très puissant pour connecter le monde physique et le monde numérique. Ils se composent d'un grand nombre de noeuds capteurs dotés de ressources limitées en termes d'énergie, de portée de capture et de communication, de vitesse de traitement et de capacité de stockage. Ils sont déployés dans un environnement intérieur ou extérieur, et ce dans de nombreux domaines d'application tels que l'armée, l'environnement, la santé, la maison et l'agriculture. La rareté des ressources des noeuds capteurs et la non fiabilité des liaisons sans fil motivent la plupart des problématiques dans le domaine des RCSFs, à savoir l'énergie, la couverture, la connectivité, le routage, la tolérance aux pannes et la sécurité. L'objectif de cette thèse est de proposer un protocole de surveillance inter-couches, à efficacité énergétique et fiable, pour la surveillance des zones sensibles clôturées, tel qu'un site pétrolier ou nucléaire, utilisant les réseaux de capteurs sans fil avec un cycle d'activité, et avec prise en compte des liens asymétriques dus au phénomène de l'irrégularité de la radio. Initialement, le protocole proposé identifie les noeuds de bordure du RCSF pour les utiliser comme nœuds sentinelles, c.-à-d., des noeuds qui sont toujours dans un état actif. Les noeuds restants sont utilisés en tant que noeuds relais avec un cycle d'activité, pendant la phase de routage des alertes vers le noeud puits. Le processus d'identification des noeuds de bordure ainsi que le routage des alertes, sont assurés par le protocole Greedy Perimeter Stateless Routing through Symmetrical Links (GPSR-SL) qui est une version améliorée du protocole GPSR, reposant sur un graphe de connectivité représenté sous forme de disques non-unité (N-UDG). Le protocole de surveillance inter-couches proposé a été implémenté et ses performances ont été évaluées en utilisant l'environnement de simulation OMNeT++/Castalia. Les résultats de performance montrent que ce protocole permet d'obtenir un ratio de livraison de paquets plus élevé d'environ 3.63%, une efficacité énergétique et une latence satisfaisante par rapport au même protocole basé sur le GPSR original
Wireless Sensor Networks (WSNs) are a special class of Ad hoc networks, which are under intensive research.They are considered as a very powerful tool to connect the physical and the digital worlds. They consist of a largenumber of sensor nodes that are characterized with limited resources in terms of energy, range of sensing and communication, processing speed and storage capacity.They are deployed in an indoor or outdoor environment in many application domains such as army, environment, health, home and agriculture. The scarcity of sensor node resources and the unreliability of wireless links drive most of the research issues in the field of WSNs, namely energy, coverage, connectivity, routing, fault tolerance and security. The aim of this thesis is to propose an energyefficient and reliable cross-layer surveillance protocol for sensitive fenced areas, such as oil or nuclear sites, using duty-cycled WSNs with asymmetrical links due to the radio irregularity phenomenon. Initially, the proposed protocol identifies the boundary nodes of the deployedWSN, to be used as sentinel nodes, i.e., nodes that are always in an active state. The remaining nodes are usedas duty-cycled relay nodes during the routing phase to relay alerts towards the sink. The boundary nodes identification process and alert routing are both performed using an enhanced version of the Greedy Perimeter Stateless Routing (GPSR) protocol, referred to as GPSR over Symmetrical Links (GPSR-SL) and which relies on a Non Unit Disk Graph (N-UDG). The proposed cross-layer surveillance protocol has been implemented and its performance has been evaluated under the OMNeT++/Castalia simulation environment. Performance results show that this protocol achieves higher Packet Delivery Ratio by up to 3.63%, energy .efficiency and satisfactory latency when compared to the same protocol based on the original GPSR
Стилі APA, Harvard, Vancouver, ISO та ін.
10

Josefsson, Elias. "Multi-viewed Visualization of Modularity for Product Line Management : Case study at Hardware Radio Design, Ericsson AB." Thesis, KTH, Maskinkonstruktion (Inst.), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-157048.

Повний текст джерела
Анотація:
The purpose of this thesis is to investigate how visualization may help Hardware Radio Design at Ericsson AB in their modularity work. As the market requires more and more versions of Radio Units, Ericsson has introduced a modular approach to product family development. With a good modularity, more variants can be developed with the same amount of resources and increase the profit margin. In the work of selecting modular plan, different stakeholders need to understand and evaluate the effect on multiple aspects. Firstly, stakeholders at Ericsson were interviewed to identify what information related to modularity that would benefit from being visualized where development time, resource usage and time-plan have been focused. Secondly, concept designs of visualizations were iteratively developed for the focused areas. The concepts are built on well-known charts, e.g. organizational charts for product structure, bar charts for resource usage and GANTT chart for time plan. Lastly, a web-application was developed with multiple interactive views and models to be able to validate the results with stakeholders. The conclusion of the thesis is that visualization of product family modularity very likely would help stakeholders to understand how modular plans affect different aspects. By supporting multiple views based on the same data, stakeholders with different viewpoints can together discuss and make better decisions. The results also show that it is very likely that a visualization tool for modularity would facilitate the communication amongst the whole organization. As future work, a more extensive verification of the visualizations and tool are necessary to ensure its value in a real development process. Great opportunities exist for expanding the tool with more types of elements, such as software and test cases. Integration with other systems may also provide additional values, such as integration with time reporting system to evaluate time estimates with real outcome.
Syftet med denna uppsats är att undersöka hur visualisering kan hjälpa Hardware Radio Design på Ericsson AB i sitt modularitetsarbete. För att kunna tillmötesgå marknades krav på fler och fler versioner av radioenheter, har Ericsson infört en modulbaserad utveckling av sin produktfamilj. Med en modulär produktfamilj kan fler varianter utvecklas med samma mängd resurser och därmed stärka Ericssons position på marknaden. I arbetet med att fastslå moduläriteten måste olika intressenter förstå och utvärdera effekten utifrån flera aspekter. Inledningsvis intervjuades utvalda intressenter på Ericsson för att identifiera den information, relaterad till modularitet, som gagnas av visualisering där utvecklingstid, resursanvändning och tidsplanering har fokuserats. Därefter utvecklades visualiseringskoncept för valda fokusområden som utvärderades av intressenterna. Koncepten innehåller kända diagram, t.ex. organisationschema för produktstruktur, stapeldiagram för resursanvändning och GANTTschema för tidsplanering. Slutligen byggdes en web-applikation med flera interaktiva vyer och modeller för att kunna validera resultaten. Slutsatsen i projektet är att en visualisering av produktfamiljens modularitet mycket sannolikt skulle hjälpa intressenter att förstå hur ett modulärt förslag påverka olika aspekter. Genom att, utifrån samma data, generera flera vyer kan aktörer med olika intressen tillsammans diskutera och fatta bättre beslut. Resultaten visar att ett visualiseringsverktyg för modularitet med stor sannolikhet också skulle underlätta kommunikationen mellan olika delar av organisationen. Som framtida arbete bör en omfattande verifiering av visualiseringarna och verktyget göras för att säkerställa dess värde i en verklig utvecklingsprocess. Det finns även stora möjligheter att utveckla verktyget med fler typer av element, t.ex. mjukvara och testfall. Även integration med andra system kan ge ytterligare värden, t.ex. tidrapporteringssystem för att utvärdera gjorda tidsestimat med verkliga utfall.
Стилі APA, Harvard, Vancouver, ISO та ін.
Більше джерел

Книги з теми "Radio link design"

1

Farrow, J. E. User-friendly software for the design of digital line-of-sight radio links. Boulder, Colo: U.S. Dept. of Commerce, National Telecommunications and Information Administration, 1989.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Ghasemi, Abdollah. Propagation Engineering in Radio Links Design. New York, NY: Springer New York, 2013.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Ghasemi, Abdollah, Ali Abedi, and Farshid Ghasemi. Propagation Engineering in Radio Links Design. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-5314-7.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Salema, Carlos. Microwave radio links: From theory to design. Hoboken, NJ: J. Wiley, 2003.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Ippolito, Louis J. Propagation effects handbook for satellite systems design: A summary of propagation impairments on 10 to 100 GHz satellite links with techniques for system design. 4th ed. Washington, D.C: National Aeronautics and Space Administration, Scientific and Technical Information Division, 1989.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Lazaris, Dimitrios Theodoros. Design and evaluation of portable antennas for location of sources of radio noise emanating from power-line hardware. Monterey, Calif: Naval Postgraduate School, 1992.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Moreno, Luigi. Herald 3.1 Radio Link Design Software. Noble Publishing Corporation, 2006.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Satellite Communications Systems Engineering: Atmospheric Effects, Satellite Link Design and System Performance. Wiley, 2017.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
9

United States. National Telecommunications and Information Administration., ed. Design and performance of a long, over-water microwave radio link. Boulder, Colo: U.S. Dept. of Commerce, National Telecommunications and Information Administration, 1990.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
10

United States. National Telecommunications and Information Administration, ed. Design and performance of a long, over-water microwave radio link. Boulder, Colo: U.S. Dept. of Commerce, National Telecommunications and Information Administration, 1990.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
Більше джерел

Частини книг з теми "Radio link design"

1

Ahmad, Seraj, Ian Blair, and Francoise Bannister. "Radio Link Control." In WCDMA - Requirements and Practical Design, 239–59. Chichester, UK: John Wiley & Sons, Ltd, 2004. http://dx.doi.org/10.1002/0470861797.ch7.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

ZH, Firouzeh, Safari-Hajat-Aghaei A, and Mirmohammad-Sadeghi H. "Design and Implementation of UHF Antennas for UAV Radio Link." In Lecture Notes in Electrical Engineering, 393–410. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-74938-9_27.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Argyris, Nikos, Giannis Giannoulis, Konstantina Kanta, Panagiotis Toumasis, Dimitrios Apostolopoulos, and Hercules Avramopoulos. "12 Gb/s Multiband Fiber-Wireless Link Using Coherent IFoF and V-band mmWave Radio." In Optical Network Design and Modeling, 437–43. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38085-4_37.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Ghasemi, Abdollah, Ali Abedi, and Farshid Ghasemi. "Short Range Radio Communications." In Propagation Engineering in Radio Links Design, 367–420. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5314-7_7.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Ghasemi, Abdollah, Ali Abedi, and Farshid Ghasemi. "Introduction to Radiowaves Propagation." In Propagation Engineering in Radio Links Design, 1–39. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5314-7_1.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Ghasemi, Abdollah, Ali Abedi, and Farshid Ghasemi. "Antennas and Passive Reflectors." In Propagation Engineering in Radio Links Design, 41–123. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5314-7_2.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Ghasemi, Abdollah, Ali Abedi, and Farshid Ghasemi. "Radiowave Propagation in Satellite Communication." In Propagation Engineering in Radio Links Design, 125–210. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5314-7_3.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Ghasemi, Abdollah, Ali Abedi, and Farshid Ghasemi. "Wireless Broadcasting." In Propagation Engineering in Radio Links Design, 211–69. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5314-7_4.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
9

Ghasemi, Abdollah, Ali Abedi, and Farshid Ghasemi. "Trans-Horizon Radiowaves Propagation." In Propagation Engineering in Radio Links Design, 271–98. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5314-7_5.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
10

Ghasemi, Abdollah, Ali Abedi, and Farshid Ghasemi. "Propagation of Radar Waves." In Propagation Engineering in Radio Links Design, 299–365. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5314-7_6.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.

Тези доповідей конференцій з теми "Radio link design"

1

Clark, D. A. "HF packet radio link layer protocol design." In Sixth International Conference on `HF Radio Systems and Techniques'. IEE, 1994. http://dx.doi.org/10.1049/cp:19940515.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Yoshimoto, Akiyo, and Takeshi Hattori. "Capacity-based Link Design of MIMO Radio Systems." In 2007 4th International Symposium on Wireless Communication Systems. IEEE, 2007. http://dx.doi.org/10.1109/iswcs.2007.4392399.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Fujii, Satoshi, Issei Nakaema, Kei Miyagi, Shouichiro Tanifuji, Noriaki Yoshikawa, Kensaku Kinoshita, and Kazutami Arimoto. "Radio link design for ITS integrated network using drone." In 2019 IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS). IEEE, 2019. http://dx.doi.org/10.1109/vts-apwcs.2019.8851623.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Gomes, Nathan J., Philippos Assimakopoulos, Luis C. Vieira, and Pavlos Sklikas. "Fiber link design considerations for cloud-Radio Access Networks." In 2014 ICC - 2014 IEEE International Conference on Communication Workshop (ICC). IEEE, 2014. http://dx.doi.org/10.1109/iccw.2014.6881227.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Taki, Mehrdad, and Farshad Lahouti. "Link adaptation design for interfering cognitive radio with QoS constraints." In 2010 17th International Conference on Telecommunications. IEEE, 2010. http://dx.doi.org/10.1109/ictel.2010.5478785.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Saponara, Sergio, and Filippo Giannetti. "Radio link design framework for WSN deployment and performance prediction." In SPIE Microtechnologies, edited by Luis Fonseca, Mika Prunnila, and Erwin Peiner. SPIE, 2017. http://dx.doi.org/10.1117/12.2265312.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Wang, Gang, Dan Shen, Genshe Chen, Xin Tian, Lun Li, Khanh Pham, Erik Blasch, and Tien Manh Nguyen. "SATCOM link adaptive configuration design in radio frequency interference environment." In 2017 IEEE Aerospace Conference. IEEE, 2017. http://dx.doi.org/10.1109/aero.2017.7943820.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Ajib, Wessam, David Haccoun, and Jean Francois Frigon. "Link Adaptation Mechanism Based on Cross Layer Design for MIMO Systems." In 2007 IEEE Radio and Wireless Symposium. IEEE, 2007. http://dx.doi.org/10.1109/rws.2007.351849.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
9

Chozhiyattel, Yunus, and Iman Affan. "Design Considerations for Over-Water Microwave Radio Links - A Case Study." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207630-ms.

Повний текст джерела
Анотація:
Abstract Arabian Gulf region with its hot, humid and prolonged summer is known to be one of the most challenging environments for radio-wave propagation. Over-the-sea microwave radio links here face degradation and unpredictability in performance due to anomalous propagation, ducting and reflective effects of large water bodies. This paper presents microwave radio link design challenges in an offshore environment and the methods implemented to overcome these challenges in the context of specific project experience in offshore field areas. A baseline design for the links was established initially which was optimized during the course of the project and during on-site implementation. Several design changes to achieve the desired performance were evaluated and implemented in the field. Required microwave link availability and performance objectives were achieved as a result of collaborative efforts between the operating company, contractor and radio manufacturer over a multi-year period. Use of quadruple diversity, optimal selection of frequencies, judicious use of ATPC (Automatic Transmit Power Control) and use of optimal signal polarisation were some of the methods used to achieve the desired link availability and performance. While these are well-known methods in radio engineering, the particular combination(s) employed to realize the desired performance objectives are identified in the paper as a lessons-learnt exercise which can be of wider application in the petroleum industry in the Gulf region. Over-water wideband microwave links are generally considered unreliable in terms of performance for utilization in process control applications involving remote shutdown and other critical operations. However, the links referred to in this paper continue to serve the field control system applications till date.
Стилі APA, Harvard, Vancouver, ISO та ін.
10

Hennawy, Hadia M. El, Alaa E. Omar, and Salah M. Kholaif. "Design of LEA: Link encryption algorithm new proposed stream cipher algorithm." In 2014 31st National Radio Science Conference (NRSC). IEEE, 2014. http://dx.doi.org/10.1109/nrsc.2014.6835064.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.

Звіти організацій з теми "Radio link design"

1

Deb, Robin, Paramita Mondal, and Ardavan Ardeshirilajimi. Bridge Decks: Mitigation of Cracking and Increased Durability—Materials Solution (Phase III). Illinois Center for Transportation, December 2020. http://dx.doi.org/10.36501/0197-9191/20-023.

Повний текст джерела
Анотація:
Type K cement offers a lower slump than conventional concrete, even at a higher water-to-cement ratio. Therefore, a suitable chemical admixture should be added to the Type K concrete mix design at a feasible dosage to achieve and retain target slump. In this project, a compatibility study was performed for Type K concrete with commercially available water-reducing and air-entraining admixtures. Slump and air content losses were measured over a period of 60 minutes after mixing and a particular mid-range water-reducing admixture was found to retain slump effectively. Furthermore, no significant difference in admixture interaction between conventional and Type K concrete was observed. Another concern regarding the use of Type K concrete is that its higher water-to-cement ratio can potentially lead to higher permeability and durability issues. This study also explored the effectiveness of presoaked lightweight aggregates in providing extra water for Type K hydration without increasing the water-to-cement ratio. Permeability of concrete was measured to validate that the use of presoaked lightweight aggregates can lower water adsorption in Type K concrete, enhancing its durability. Extensive data analysis was performed to link the small-scale material test results with a structural test performed at Saint Louis University. A consistent relation was established in most cases, validating the effectiveness of both testing methods in understanding the performance of proposed shrinkage-mitigation strategies. Stress analysis was performed to rank the mitigation strategies. Type K incorporation is reported to be the most effective method for shrinkage-related crack mitigation among the mixes tested in this study. The second-best choice is the use of Type K in combination with either presoaked lightweight aggregates or shrinkage-reducing admixtures. All mitigation strategies tested in this work were proved to be significantly better than using no mitigation strategy.
Стилі APA, Harvard, Vancouver, ISO та ін.
2

van den Boogaard, Vanessa, Wilson Prichard, Rachel Beach, and Fariya Mohiuddin. Strengthening Tax-Accountability Links: Fiscal Transparency and Taxpayer Engagement in Ghana and Sierra Leone. Institute of Development Studies, November 2020. http://dx.doi.org/10.19088/ictd.2020.002.

Повний текст джерела
Анотація:
There is increasingly strong evidence that taxation can contribute to expanded government responsiveness and accountability. However, such positive connections are not guaranteed. Rather, they are shaped by the political and economic context and specific policies adopted by governments and civil society actors. Without an environment that enables tax bargaining, there is a risk that taxation will amount to little more than forceful extraction. We consider how such enabling environments may be fostered through two mixed methods case studies of tax transparency and taxpayer engagement in Sierra Leone and Ghana. We highlight two key sets of findings. First, tax transparency is only meaningful if it is accessible and easily understood by taxpayers and relates to their everyday experiences and priorities. In particular, we find that taxpayers do not just want basic information about tax obligations or aggregate revenue collected, but information about how much revenue should have been collected and how revenues were spent. At the same time, taxpayers do not want information to be shared with them through a one-way form of communication, but rather want to have spaces for dialogue and interaction with tax and government officials, including through public meetings and radio call-in programmes. Second, strategies to encourage taxpayer engagement are more likely to be effective where forums for engagement are perceived by taxpayers to be safe, secure, and sincere means through which to engage with government officials. This has been most successful where governments have visibly demonstrated responsiveness to citizen concerns, even on a small scale, while partnering with civil society to foster trust, dialogue and expanded knowledge. These findings have significant implications for how governments design taxpayer education and engagement programmes and how civil society actors and development partners can support more equitable and accountable tax systems. Our findings provide concrete lessons for how governments can ensure that information shared with taxpayers is meaningful and accessible. Moreover, we show that civil society actors can play important roles as translators of tax information, enablers of public forums and dialogues around tax issues, and trainers of taxpayers, supporting greater tax literacy and sustained citizen engagement.
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Striuk, Andrii M., and Serhiy O. Semerikov. The Dawn of Software Engineering Education. [б. в.], February 2020. http://dx.doi.org/10.31812/123456789/3671.

Повний текст джерела
Анотація:
Designing a mobile-oriented environment for professional and practical training requires determining the stable (fundamental) and mobile (technological) components of its content and determining the appropriate model for specialist training. In order to determine the ratio of fundamental and technological in the content of software engineers’ training, a retrospective analysis of the first model of training software engineers developed in the early 1970s was carried out and its compliance with the current state of software engineering development as a field of knowledge and a new the standard of higher education in Ukraine, specialty 121 “Software Engineering”. It is determined that the consistency and scalability inherent in the historically first training program are largely consistent with the ideas of evolutionary software design. An analysis of its content also provided an opportunity to identify the links between the training for software engineers and training for computer science, computer engineering, cybersecurity, information systems and technologies. It has been established that the fundamental core of software engineers’ training should ensure that students achieve such leading learning outcomes: to know and put into practice the fundamental concepts, paradigms and basic principles of the functioning of language, instrumental and computational tools for software engineering; know and apply the appropriate mathematical concepts, domain methods, system and object-oriented analysis and mathematical modeling for software development; put into practice the software tools for domain analysis, design, testing, visualization, measurement and documentation of software. It is shown that the formation of the relevant competencies of future software engineers must be carried out in the training of all disciplines of professional and practical training.
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Ali, Rassul. Konzeptentwicklung für CDM-Projekte - Risikoanalyse der projektbezogenen Generierung von CO2-Zertifikaten (CER). Sonderforschungsgruppe Institutionenanalyse, 2007. http://dx.doi.org/10.46850/sofia.9783933795842.

Повний текст джерела
Анотація:
The Clean Development Mechanism (CDM) is a complex legal-institutional system that, on the one hand, offers industrialized countries options for cost-effective emission reductions and, on the other, provides developing countries with opportunities for sustainable development. Investors face the difficulty of identifying suitable CDM projects from approximately 130 possible host countries and nearly 60 possible project activities. In order to develop points of reference for strategic investments, this paper identifies and categorizes the risks arising in the value creation process of bilateral energy projects into four action-related levels. At the host level, the focus is on political-institutional and sector-specific risks, while at the investor state level, the legal design of the CDM's complementary function is relevant. The project level covers technology- and process-related risks, with the identification of the reference case and the proof of additionality posing particular problems. The future design of the CDM and the reform of the procedure at the UNFCCC level pose a fundamental risk. A two-stage assessment procedure is proposed for risk assessment: a rough analysis captures sociographic, climate policy, institutional and sector-specific criteria of the host. The differentiation of the project stage allows the localization of the project in the value chain and a differentiation regarding the use of methods. The assessment of project registration is based on the methods used and gives recognition rates per method and project category; project performance is measured in terms of the ratio of emission reductions actually realized to those planned in the project documentation. A detailed analysis following the coarse analysis provides qualitative guidance for project evaluation. These include the Executive Board's methodological principles, correct application of methodologies, identification of the reference case, proof of additionality, as well as the financial conditions of the relevant sector and publicity-related aspects. Despite individual hosts and project technologies, the developed two-step risk analysis allows, with relatively little effort and in line with business practice, an initial assessment of CDM project risks, so that overall it lays a fundamental building block for the elaboration of a strategic implementation and sustainable investment under the CDM.
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Pullammanappallil, Pratap, Haim Kalman, and Jennifer Curtis. Investigation of particulate flow behavior in a continuous, high solids, leach-bed biogasification system. United States Department of Agriculture, January 2015. http://dx.doi.org/10.32747/2015.7600038.bard.

Повний текст джерела
Анотація:
Recent concerns regarding global warming and energy security have accelerated research and developmental efforts to produce biofuels from agricultural and forestry residues, and energy crops. Anaerobic digestion is a promising process for producing biogas-biofuel from biomass feedstocks. However, there is a need for new reactor designs and operating considerations to process fibrous biomass feedstocks. In this research project, the multiphase flow behavior of biomass particles was investigated. The objective was accomplished through both simulation and experimentation. The simulations included both particle-level and bulk flow simulations. Successful computational fluid dynamics (CFD) simulation of multiphase flow in the digester is dependent on the accuracy of constitutive models which describe (1) the particle phase stress due to particle interactions, (2) the particle phase dissipation due to inelastic interactions between particles and (3) the drag force between the fibres and the digester fluid. Discrete Element Method (DEM) simulations of Homogeneous Cooling Systems (HCS) were used to develop a particle phase dissipation rate model for non-spherical particle systems that was incorporated in a two-fluid CFDmultiphase flow model framework. Two types of frictionless, elongated particle models were compared in the HCS simulations: glued-sphere and true cylinder. A new model for drag for elongated fibres was developed which depends on Reynolds number, solids fraction, and fibre aspect ratio. Schulze shear test results could be used to calibrate particle-particle friction for DEM simulations. Several experimental measurements were taken for biomass particles like olive pulp, orange peels, wheat straw, semolina, and wheat grains. Using a compression tester, the breakage force, breakage energy, yield force, elastic stiffness and Young’s modulus were measured. Measurements were made in a shear tester to determine unconfined yield stress, major principal stress, effective angle of internal friction and internal friction angle. A liquid fludized bed system was used to determine critical velocity of fluidization for these materials. Transport measurements for pneumatic conveying were also assessed. Anaerobic digestion experiments were conducted using orange peel waste, olive pulp and wheat straw. Orange peel waste and olive pulp could be anaerobically digested to produce high methane yields. Wheat straw was not digestible. In a packed bed reactor, anaerobic digestion was not initiated above bulk densities of 100 kg/m³ for peel waste and 75 kg/m³ for olive pulp. Interestingly, after the digestion has been initiated and balanced methanogenesis established, the decomposing biomass could be packed to higher densities and successfully digested. These observations provided useful insights for high throughput reactor designs. Another outcome from this project was the development of low cost devices to measure methane content of biogas for off-line (US$37), field (US$50), and online (US$107) applications.
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Seginer, Ido, Daniel H. Willits, Michael Raviv, and Mary M. Peet. Transpirational Cooling of Greenhouse Crops. United States Department of Agriculture, March 2000. http://dx.doi.org/10.32747/2000.7573072.bard.

Повний текст джерела
Анотація:
Background Transplanting vegetable seedlings to final spacing in the greenhouse is common practice. At the time of transplanting, the transpiring leaf area is a small fraction of the ground area and its cooling effect is rather limited. A preliminary modeling study suggested that if water supply from root to canopy is not limiting, a sparse crop could maintain about the same canopy temperature as a mature crop, at the expense of a considerably higher transpiration flux per leaf (and root) area. The objectives of this project were (1) to test the predictions of the model, (2) to select suitable cooling methods, and (3) to compare the drought resistance of differently prepared seedlings. Procedure Plants were grown in several configurations in high heat load environments, which were moderated by various environmental control methods. The difference between the three experimental locations was mainly in terms of scale, age of plants, and environmental control. Young potted plants were tested for a few days in small growth chambers at Technion and Newe Ya'ar. At NCSU, tomato plants of different ages and planting densities were compared over a whole growing season under conditions similar to commercial greenhouses. Results Effect of spacing: Densely spaced plants transpired less per plant and more per unit ground area than sparsely spaced plants. The canopy temperature of the densely spaced plants was lower. Air temperature was lower and humidity higher in the compartments with the densely spaced plants. The difference between species is mainly in the canopy-to-air Bowen ratio, which is positive for pepper and negative for tomato. Effect of cooling methods: Ventilation and evaporative pad cooling were found to be effective and synergitic. Air mixing turned out to be very ineffective, indicating that the canopy-to-air transfer coefficient is not the limiting factor in the ventilation process. Shading and misting, both affecting the leaf temperature directly, proved to be very effective canopy cooling methods. However, in view of their side effects, they should only be considered as emergency measures. On-line measures of stress: Chlorophyll fluorescence was shown to accurately predict photosynthesis. This is potentially useful as a rapid, non-contact way of assessing canopy heat stress. Normalized canopy temperature and transpiration rate were shown to correlate with water stress. Drought resistance of seedlings: Comparison between normal seedlings and partially defoliated ones, all subjected to prolonged drought, indicated that removing about half of the lowermost leaves prior to transplanting, may facilitate adjustment to the more stressful conditions in the greenhouse. Implications The results of this experimental study may lead to: (1) An improved model for a sparse canopy in a greenhouse. (2) A better ventilation design procedure utilizing improved estimates of the evaporation coefficient for different species and plant configurations. (3) A test for the stress resistance of transplants.
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Viswanathan, Meera, Jennifer Cook Middleton, Alison Stuebe, Nancy Berkman, Alison N. Goulding, Skyler McLaurin-Jiang, Andrea B. Dotson, et al. Maternal, Fetal, and Child Outcomes of Mental Health Treatments in Women: A Systematic Review of Perinatal Pharmacologic Interventions. Agency for Healthcare Research and Quality (AHRQ), April 2021. http://dx.doi.org/10.23970/ahrqepccer236.

Повний текст джерела
Анотація:
Background. Untreated maternal mental health disorders can have devastating sequelae for the mother and child. For women who are currently or planning to become pregnant or are breastfeeding, a critical question is whether the benefits of treating psychiatric illness with pharmacologic interventions outweigh the harms for mother and child. Methods. We conducted a systematic review to assess the benefits and harms of pharmacologic interventions compared with placebo, no treatment, or other pharmacologic interventions for pregnant and postpartum women with mental health disorders. We searched four databases and other sources for evidence available from inception through June 5, 2020 and surveilled the literature through March 2, 2021; dually screened the results; and analyzed eligible studies. We included studies of pregnant, postpartum, or reproductive-age women with a new or preexisting diagnosis of a mental health disorder treated with pharmacotherapy; we excluded psychotherapy. Eligible comparators included women with the disorder but no pharmacotherapy or women who discontinued the pharmacotherapy before pregnancy. Results. A total of 164 studies (168 articles) met eligibility criteria. Brexanolone for depression onset in the third trimester or in the postpartum period probably improves depressive symptoms at 30 days (least square mean difference in the Hamilton Rating Scale for Depression, -2.6; p=0.02; N=209) when compared with placebo. Sertraline for postpartum depression may improve response (calculated relative risk [RR], 2.24; 95% confidence interval [CI], 0.95 to 5.24; N=36), remission (calculated RR, 2.51; 95% CI, 0.94 to 6.70; N=36), and depressive symptoms (p-values ranging from 0.01 to 0.05) when compared with placebo. Discontinuing use of mood stabilizers during pregnancy may increase recurrence (adjusted hazard ratio [AHR], 2.2; 95% CI, 1.2 to 4.2; N=89) and reduce time to recurrence of mood disorders (2 vs. 28 weeks, AHR, 12.1; 95% CI, 1.6 to 91; N=26) for bipolar disorder when compared with continued use. Brexanolone for depression onset in the third trimester or in the postpartum period may increase the risk of sedation or somnolence, leading to dose interruption or reduction when compared with placebo (5% vs. 0%). More than 95 percent of studies reporting on harms were observational in design and unable to fully account for confounding. These studies suggested some associations between benzodiazepine exposure before conception and ectopic pregnancy; between specific antidepressants during pregnancy and adverse maternal outcomes such as postpartum hemorrhage, preeclampsia, and spontaneous abortion, and child outcomes such as respiratory issues, low Apgar scores, persistent pulmonary hypertension of the newborn, depression in children, and autism spectrum disorder; between quetiapine or olanzapine and gestational diabetes; and between benzodiazepine and neonatal intensive care admissions. Causality cannot be inferred from these studies. We found insufficient evidence on benefits and harms from comparative effectiveness studies, with one exception: one study suggested a higher risk of overall congenital anomalies (adjusted RR [ARR], 1.85; 95% CI, 1.23 to 2.78; N=2,608) and cardiac anomalies (ARR, 2.25; 95% CI, 1.17 to 4.34; N=2,608) for lithium compared with lamotrigine during first- trimester exposure. Conclusions. Few studies have been conducted in pregnant and postpartum women on the benefits of pharmacotherapy; many studies report on harms but are of low quality. The limited evidence available is consistent with some benefit, and some studies suggested increased adverse events. However, because these studies could not rule out underlying disease severity as the cause of the association, the causal link between the exposure and adverse events is unclear. Patients and clinicians need to make an informed, collaborative decision on treatment choices.
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Galili, Naftali, Roger P. Rohrbach, Itzhak Shmulevich, Yoram Fuchs, and Giora Zauberman. Non-Destructive Quality Sensing of High-Value Agricultural Commodities Through Response Analysis. United States Department of Agriculture, October 1994. http://dx.doi.org/10.32747/1994.7570549.bard.

Повний текст джерела
Анотація:
The objectives of this project were to develop nondestructive methods for detection of internal properties and firmness of fruits and vegetables. One method was based on a soft piezoelectric film transducer developed in the Technion, for analysis of fruit response to low-energy excitation. The second method was a dot-matrix piezoelectric transducer of North Carolina State University, developed for contact-pressure analysis of fruit during impact. Two research teams, one in Israel and the other in North Carolina, coordinated their research effort according to the specific objectives of the project, to develop and apply the two complementary methods for quality control of agricultural commodities. In Israel: An improved firmness testing system was developed and tested with tropical fruits. The new system included an instrumented fruit-bed of three flexible piezoelectric sensors and miniature electromagnetic hammers, which served as fruit support and low-energy excitation device, respectively. Resonant frequencies were detected for determination of firmness index. Two new acoustic parameters were developed for evaluation of fruit firmness and maturity: a dumping-ratio and a centeroid of the frequency response. Experiments were performed with avocado and mango fruits. The internal damping ratio, which may indicate fruit ripeness, increased monotonically with time, while resonant frequencies and firmness indices decreased with time. Fruit samples were tested daily by destructive penetration test. A fairy high correlation was found in tropical fruits between the penetration force and the new acoustic parameters; a lower correlation was found between this parameter and the conventional firmness index. Improved table-top firmness testing units, Firmalon, with data-logging system and on-line data analysis capacity have been built. The new device was used for the full-scale experiments in the next two years, ahead of the original program and BARD timetable. Close cooperation was initiated with local industry for development of both off-line and on-line sorting and quality control of more agricultural commodities. Firmalon units were produced and operated in major packaging houses in Israel, Belgium and Washington State, on mango and avocado, apples, pears, tomatoes, melons and some other fruits, to gain field experience with the new method. The accumulated experimental data from all these activities is still analyzed, to improve firmness sorting criteria and shelf-life predicting curves for the different fruits. The test program in commercial CA storage facilities in Washington State included seven apple varieties: Fuji, Braeburn, Gala, Granny Smith, Jonagold, Red Delicious, Golden Delicious, and D'Anjou pear variety. FI master-curves could be developed for the Braeburn, Gala, Granny Smith and Jonagold apples. These fruits showed a steady ripening process during the test period. Yet, more work should be conducted to reduce scattering of the data and to determine the confidence limits of the method. Nearly constant FI in Red Delicious and the fluctuations of FI in the Fuji apples should be re-examined. Three sets of experiment were performed with Flandria tomatoes. Despite the complex structure of the tomatoes, the acoustic method could be used for firmness evaluation and to follow the ripening evolution with time. Close agreement was achieved between the auction expert evaluation and that of the nondestructive acoustic test, where firmness index of 4.0 and more indicated grade-A tomatoes. More work is performed to refine the sorting algorithm and to develop a general ripening scale for automatic grading of tomatoes for the fresh fruit market. Galia melons were tested in Israel, in simulated export conditions. It was concluded that the Firmalon is capable of detecting the ripening of melons nondestructively, and sorted out the defective fruits from the export shipment. The cooperation with local industry resulted in development of automatic on-line prototype of the acoustic sensor, that may be incorporated with the export quality control system for melons. More interesting is the development of the remote firmness sensing method for sealed CA cool-rooms, where most of the full-year fruit yield in stored for off-season consumption. Hundreds of ripening monitor systems have been installed in major fruit storage facilities, and being evaluated now by the consumers. If successful, the new method may cause a major change in long-term fruit storage technology. More uses of the acoustic test method have been considered, for monitoring fruit maturity and harvest time, testing fruit samples or each individual fruit when entering the storage facilities, packaging house and auction, and in the supermarket. This approach may result in a full line of equipment for nondestructive quality control of fruits and vegetables, from the orchard or the greenhouse, through the entire sorting, grading and storage process, up to the consumer table. The developed technology offers a tool to determine the maturity of the fruits nondestructively by monitoring their acoustic response to mechanical impulse on the tree. A special device was built and preliminary tested in mango fruit. More development is needed to develop a portable, hand operated sensing method for this purpose. In North Carolina: Analysis method based on an Auto-Regressive (AR) model was developed for detecting the first resonance of fruit from their response to mechanical impulse. The algorithm included a routine that detects the first resonant frequency from as many sensors as possible. Experiments on Red Delicious apples were performed and their firmness was determined. The AR method allowed the detection of the first resonance. The method could be fast enough to be utilized in a real time sorting machine. Yet, further study is needed to look for improvement of the search algorithm of the methods. An impact contact-pressure measurement system and Neural Network (NN) identification method were developed to investigate the relationships between surface pressure distributions on selected fruits and their respective internal textural qualities. A piezoelectric dot-matrix pressure transducer was developed for the purpose of acquiring time-sampled pressure profiles during impact. The acquired data was transferred into a personal computer and accurate visualization of animated data were presented. Preliminary test with 10 apples has been performed. Measurement were made by the contact-pressure transducer in two different positions. Complementary measurements were made on the same apples by using the Firmalon and Magness Taylor (MT) testers. Three-layer neural network was designed. 2/3 of the contact-pressure data were used as training input data and corresponding MT data as training target data. The remaining data were used as NN checking data. Six samples randomly chosen from the ten measured samples and their corresponding Firmalon values were used as the NN training and target data, respectively. The remaining four samples' data were input to the NN. The NN results consistent with the Firmness Tester values. So, if more training data would be obtained, the output should be more accurate. In addition, the Firmness Tester values do not consistent with MT firmness tester values. The NN method developed in this study appears to be a useful tool to emulate the MT Firmness test results without destroying the apple samples. To get more accurate estimation of MT firmness a much larger training data set is required. When the larger sensitive area of the pressure sensor being developed in this project becomes available, the entire contact 'shape' will provide additional information and the neural network results would be more accurate. It has been shown that the impact information can be utilized in the determination of internal quality factors of fruit. Until now,
Стилі APA, Harvard, Vancouver, ISO та ін.
Також вас можуть зацікавити розширені добірки на тему "Radio link design" для конкретних типів джерел:
Статті в журналах Дисертації Книги
Ми пропонуємо знижки на всі преміум-плани для авторів, чиї праці увійшли до тематичних добірок літератури. Зв'яжіться з нами, щоб отримати унікальний промокод!

До бібліографії