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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Från statusuppdatering till nytt jobb? : en kvalitativ studie om Facebookprofilens betydelse i rekryteringssammanhang bland småföretagare. / From status update to new job? : a qualitative study about the importance of Facebook Profiles in the context of recruitment among small business owners.

Persson, Elenor January 2013 (has links)
Arbetsgivares nätkontroller i sociala medier är bara ett exempel på alla emergenta beteendemönstersom utvecklats både på individ- företagande- och samhällsnivå på grund av den interaktiva webben(Webb 2.0) och Facebook kring vilket en diskussion förs.Resultatet i den kvalitativa studien sammanställs i en slutsats giltig för den lokala urvalsgruppeninkluderande 7 småföretagare och påvisar att arbetsgivarna, även om det inte alltid är helt medvetet, påverkas i sina subjektiva bedömningar kring arbetssökandens lämplighet för anställning genominformation inhämtad från Facebook jämte andra informationskällor. Facebook är en social webbaserad plattform ursprungligen designad för social interaktion koppladtill privatlivet. Information lyfts ur sitt sammanhang och in i helt andra kontexter när andra aktörer i form av beslutsfattande yrkespersoner träder in på nätverket i syfte att bakgrundskontrollera. Informationen kan tolkas och användas som informationsunderlag för professionellt beslutsfattandeoch påverka användares livsförhållanden. Resultatet redovisar för några svårigheter och möjlighetermed informationsöverföring via Facebook som kan vara av intresse att överväga och diskutera vidpolicyutformningar för sociala medier kopplat till informationsinhämtning vid rekrytering samt viddesignandet av social informationsteknik. / Employers background checks in social media is just one example of all emergent behavioralpatterns developed at the individual- enterprise- and community level because of the interactiveweb (Web 2.0) and Facebook around which a discussion is held. The results of the qualitative study is compiled in a conclusion valid for the local sample groupincluding 7 small business owners and demonstrates that employers, although it is not alwaysconsciously, are influenced in their subjective judgments about the job applicants suitability foremployment through information obtained from Facebook along with other information sources. Facebook is a web-based social platform originally designed for social interaction related toprivacy. The information are used in completely different contexts when other stakeholders in theform of decision-making professionals enter the network in order to perform background checks. This information can be interpreted and used as a basis for professional decision-making and influence users' living conditions. Earnings reports for some difficulties and opportunities ofinformation transfer through Facebook that may be of interest to consider and discuss whilecomposing social media policys related to information gathering during recruitment and duringinteraction design of social media.
22

Automatizace procesu projektování a programování stroje / Automation the process of designing and programming of machine

Boček, Jaromír January 2017 (has links)
This diploma thesis deals with the issue of information transfer between the Department of Electrical Equipment Design and the Software Development Department of the control system of this machine. The diploma thesis focuses mainly on the elimination of the influence of the human factor while increasing the efficiency of this information transfer. System analysis examines the issues and investigates the reliability of information transfer. On the basis of the requirements resulting from the analysis, preventive measures and modifications of procedures in both departments have been proposed. Simultaneously, its own software applications have been developed to considerably simplify and accelerate the process, while meeting the requirements to eliminate problematic phenomena caused particularly by human factors. The resulting solution is verified according to the designated verification process and reassessed by own "SampleVUT" test project. Validation evaluates the effectiveness of the proposed solution.
23

Sjuksköterskors erfarenhet av informationsöverföring vid inflyttning av en person till särskilt boende med demensinriktning : En kvalitativ intervjustudie / Nurses’ experience of information transfer when moving a person into a nursing home with a focus on dementia : A qualitative interview study

Gylling Rönnbäck, Cecilia, Gustafsson, Josefin January 2023 (has links)
Bakgrund I samband med att personer med demenssjukdom flyttar mellan olika vårdformer prövas samarbetet i vården, bland annat genom informationsutbyte omkring personens situation och behov av vård. Syfte Syftet med studien är att beskriva sjuksköterskors erfarenhet av informationsöverföring i samband med inflyttning för personer med demenssjukdom till särskilt boende. Metod I studien har kvalitativ metod använts, där insamlade data analyserats med induktiv ansats. Urvalet bestod av elva sjuksköterskor från olika delar i mellan Sverige, där alla arbetar, eller har arbetat på särskilt boende. Resultat Resultatet av studien utmynnade i ett tema ”Strukturerad helhetsinformation kan bidra till en personcentrerad vård” och kategorierna ”Erfarenheter av bristande informationsinnehåll ger konsekvenser”, ”Varierande rutiner med olika vårdgivare” och ” Helhetsbaserad kunskap ger förutsättningar för att bedriva personcentrerad vård” Slutsats Sjuksköterskor som arbetar på särskilt boende upplever ofta att de inte får tillräckligt med information inför att en person flyttar in på boende med demensinriktning. Med en högre kvalitet på informationsöverföringen skapas förutsättningar för att kunna bedriva personcentrerad vård. / Background When people with dementia are moving between different forms of care, cooperation in care is tested, including the exchange of information about the person’s situation and need for care. Aim The aim of this study is to describe nurses' experience of information transfer by the time people with dementia are moving into a nursing home. Method In this study, a qualitative method has been used, where collected data were analysed with an inductive approach. The sample consisted of eleven nurses from different parts of the middle of Sweden, where all work, or have worked, in nursing home. Results The result of the study resulted in a theme "Structured holistic information can contribute to person-centred care" and the categories "Experiences of lack of information content gives consequences" and "Different routines with holistic knowledge provides the conditions for conducting person-centred care". Conclusions Nurses who work in nursing homes often feel that they do not receive enough information before a person moves into a nursing home with dementia focus. With a higher quality of information transfer, conditions to conduct person-centred care are created.
24

Communication and Patient Safety : Transfer of information between healthcare personnel in anaesthetic clinics

Randmaa, Maria January 2016 (has links)
Communication errors are frequent during the perioperative period and cause clinical incidents and adverse events. The overall aim of the thesis was to study communication – the transfer of information, especially the postoperative handover – between healthcare personnel in an anaesthetic clinic and the effects of using the communication tool SBAR (Situation-Background-Assessment-Recommendation) from a patient safety perspective. The thesis is based on studies using a correlational (Paper I), quasi-experimental (Paper II and III) and descriptive (Paper IV) design. Data were collected using digitally recorded and structured observations of handovers, anaesthetic records, questionnaires, incident reports and focus group interviews. The results from baseline data showed that lack of structure and long duration of the verbal postoperative handover decreased how much the receiver of postoperative handover remembered; the item most likely not to be remembered by the receiver was anaesthetic drugs. The variation in remembered information showed that there were room for improvement (Paper I). Implementing the communication tool SBAR increased memorized information among receivers following postoperative handover. Interruptions were frequent during postoperative handover, which negatively affected memorized information (Paper III). Furthermore, after implementation of SBAR, the personnel’s perception of communication between professionals and the safety climate improved, and the proportion of incident reports related to communication errors decreased in the intervention group (Paper II). The results of the focus group interviews revealed that the nurse anaesthetists, anaesthesiologists and post-anaesthesia care unit nurses had somewhat different focuses and views of the postoperative handover, but all professional groups were uncertain about having all information needed to secure the quality of postoperative care (Paper IV). The findings indicate that using a predictable structure during postoperative handover may improve the information memorized by the receiver, perception of communication between professionals and perception of safety climate. Incidents related to communication errors may also decrease. Long duration of the handover and interruptions may negatively affect the information memorized by receiver. To ensure high quality and safe care, there is a need to achieve a shared understanding across professionals of their work in its entirety.
25

Påverkan av kommunikation och effektivitet i byggproduktion med hjälp av Dalux Field / Dalux Field's impact on communication and efficiency in construction

Fredriksson, Olivia, Persson, Olle January 2019 (has links)
Syfte: Genom att förbättra kommunikationen och effektiviteten i produktionen på en arbetsplats kan stora besparingar göras. Målet med examensarbetet är därför att undersöka hur Dalux Field påverkar produktionen på en byggarbetsplats genom att besvara (1) Hur påverkar användningen av Dalux Field kommunkationen i produktionen på en byggarbetsplats? och (2) Hur påverkar användningen av Dalux Field effektiviteten i produktionen på en byggarbetsplats? Metod: Arbetet innefattar en litteraturstudie samt en fallstudie med intervjuer på NCC:s byggarbetsplats D1 Ryhov i Jönköping. Fyra Arbetsledare har intervjuats varav två använder programvaran och två inte gör det. Utöver dessa intervjuas tre ledande montörer som aktivt använder sig utav programvaran. Litteraturstudien används för att bekräfta eller motsäga den insamlade empirin. Resultat: Dalux Field minskar kommunikationen på byggarbetsplatsen då arbetsledaren och den ledande montören har tillgång till modellen ute på arbetsplatsen. Vid eventuella kollisioner kan beslut tas direkt eftersom att de kringliggande installationerna är synliga i modellen. Detta ökar i sin tur effektiviteten eftersom att mindre stopp förekommer i produktionen. Eftersom en byggnads olika objekt består av en stor del information används med fördel Dalux Field som ett komplement då all denna information inte kan redovisas på en 2D-ritning. Vidare anser respondenterna att Dalux Field med fördel även används som ett visuellt komplement för att ge en helhetsbild av slutprodukten. Konsekvenser: Vid bevarandet av frågeställningarna drogs slutsatserna att användandet av Dalux Field effektiviserar kommunikationen som i sin tur effektiviserar byggproduktionen. För att förbättra verktyget ytterligare rekommenderas funktioner som mätverktyg och höjdsättning att ses över. Om Dalux Field ska utnyttjas till sin fulla potential krävs även att samtliga parter på byggarbetsplatsen har tillgång till och använder programmet. Begränsningar: På referensprojektet användes i första hand en intern plattform som kommunikationsverktyg. Resultatets giltighet hade stärkts om Dalux Field används primärt på helt byggarbetsplatsen. Eftersom NCC är ett stort företag inom byggsektorn med stora projekt, resurser och tillgångar är en generalisering med hela byggbranschen vag. Resultatet går att generalisera med liknande stora byggföretag med liknande projektstorlek, resurser och tillgångar. Nyckelord: Byggnads Informations Modellering, Kommunikationsverktyg, Byggproduktion, Informationsöverföring, Kollisionshantering, Effektivitet, Kommunikation, Dalux Field. / Purpose: By improving the communication and the efficiency in construction site production large savings may emerge. The main intentions with this thesis are therefore to examine whether how Dalux Field affects the production phase in construction by answering (1) How the use of Dalux Field affects the communication in the production on a construction site? and (2) How the use of Dalux Field affects the efficiency in the production on a construction site? Method: The work includes a literature study and a case study with interviews on NCC:s construction site D1 Ryhov in Jönköping. Four foremen have been interviewed whereof two use the software and two did not. Beyond these, three leading installers who actively use the software have been interviewed. The literature study was used to either confirm or contradict the collected data. Findings: Dalux Field reduces the communication on a construction site since the foreman and the leading installer have access to the model on site. In the event of a collision, decisions can be made instantly because the surrounding installations are visible in the model. This increases the efficiency, since smaller stops occur in production. Since a building’s various objects consists of a great deal of information Dalux Field is advantageously used as a supplement since all this information cannot be reported on a 2D drawing. Furthermore, the respondents consider that Dalux Field is also advantageously used as a visual supplement to give a complete picture of the end product. Implications: When answering the questions at hand, the conclusions were that the use of Dalux Field makes the communication more effective, which in turn makes the production phase in construction more efficient. In order to further improve the tool, features such as the measuring tool and height recommended to be reviewed. If Dalux Field is to be utilized to its full potential, it is also required that all parties in the construction phase have access to and use the program. Limitations: On the reference project an internal platform for communication is used primarily. The validity of the result would be strengthened if Dalux Field was the primary communication tool. Since NCC is a big company in the sector with a big number of projects, resources and assets, a generalization with the whole sector is not possible. The result can be generalized with equal building companies with similar projects, resources and assets. Keywords: Building Information Modeling, Communication tool, Construction production, information transfer, collision, efficiency, communication, Dalux Field.
26

Vem har nytta av en siffra? : -      en fallstudie av ett förbättringsarbete med syfte att förbättra och kvalitetssäkra smärtbehandling för palliativa patienter i regionsansluten specialiserad hemsjukvård. / Does the number count? : – A case study of an improvement project focusing pain management routine in specialized palliative care.

Halldorf, Karin January 2019 (has links)
Vem har nytta av en siffra?– En fallstudie av ett förbättringsarbete med syfte att förbättra och kvalitetssäkra smärtbehandling för palliativa patienter i regionsansluten specialiserad hemsjukvård.   Bakgrund: Palliativ vård, vård i livets slut, ändrar fokus från bot till lindring. Det viktigaste målet för palliativ vård är symtomlindring och smärta är det symtom som har störst betydelse för livskvalitet. Numeric Rating Symptom Scale, NRS, har visat sig underlätta utvärdering och kvalitetssäkring av smärtbehandling.   Syfte: Förbättringsarbetets mål var att förbättra smärtbehandlingen för inskrivna patienter. Studiens syfte har varit att hitta motiverande faktorer samt undersöka medarbetarnas upplevelse av förbättringsarbetet.   Metod: Nolans modell för förbättring och PDSA-hjul enligt Deming, fiskbensdiagram och 5p-kartläggning av mikrosystemet har använts i förbättringsprojektet. Både kvalitativa och kvantitativa data har inhämtats till studien av förbättringsarbetet. Intervjuer har utförts och analyserats med innehållsanalys.   Resultat: NRS fanns dokumenterat för utvärdering av smärtbehandling i 15 % av patientbesöken och enhetens medelvärde för NRS per vecka var 4 eller lägre. Studien visar att medarbetarna har kunskap om hur NRS ska användas och mäta men att förståelse för varför och för vem skull detta är viktigt saknas.   Slutsats:Deltagande i detta förbättringsarbete har ökat kunskapen bland medarbetarna. Diskussioner visar på ett skifte från individ till system och en förflyttning av fokus mot patientens behov och involvering samt förståelse för målet med vård utförd av arbetsplatsen. / Does the number count? – A case study of an improvement project focusing pain management routine in specialized palliative care.   Background:Palliative care, end-of-life care, change focus from cure to comfort, ease and relieve symptoms. Management of symptoms are important palliative care and pain have a big effect on patient’s quality of life. Numeric Rate Symptom Scale, NRS, have proved to help medical units to evaluate pain management.   Purpose:  The aim of the improvement work was to improve pain management routine for patients. The purpose of the study was to find motivating factors and to find how employees ‘experiences the improvement initiative.    Method: Nolan´s model of improvement with PDSA cycles from Deming, Ishikawa diagram and description of micro system 5p wereused for the improvement project. The study was based on a qualitative and quantitative data collections. The interviews were analysed by content analysis.    Results:NRS are used in 15 % of evaluation of pain management and the average NRS where 4 or less. Data from the study shows knowledge among employees´about how to use NRS and what NRS is made to display but lack knowlegde of why and for whom.   Conclusions: This project created common learning through participation in the improvement project. Focus are starting to change and more discussions shifting from individual to system level about patient involvement and consensus on aim of care.
27

Stochastic simulation and analysis of biochemical networks

Pahle, Jürgen 27 June 2008 (has links)
Stochastische Effekte können einen großen Einfluss auf die Funktionsweise von biochemischen Netzwerken haben. Vor allem Signalwege, z.B. Calciumsignaltransduktion, sind anfällig gegenüber zufälligen Schwankungen. Daher stellt sich die wichtige Frage, wie dadurch der Informationstransfer in diesen Systemen beeinträchtigt wird. Zunächst werden eine Reihe von stochastischen Simulationsmethoden diskutiert und systematisch klassifiziert. Dies dient als methodische Grundlage der ganzen Dissertation. Der Schwerpunkt liegt hier auf approximativen und hybriden Ansätzen, einschließlich der Hybridmethode des Softwaresystems Copasi, deren Implementierung Teil dieser Arbeit war. Die Dynamik biochemischer Systeme zeigt in den meisten Fällen einen Übergang von stochastischem zu deterministischem Verhalten mit steigender Partikelzahl. Dieser Übergang wird für Calciumsignaltransduktion und andere Systeme untersucht. Es zeigt sich, dass das Auftreten stochastischer Effekte stark von der Sensitivität des Systems abhängt. Ein Maß dafür ist die Divergenz. Systeme mit hoher Divergenz zeigen noch mit hohen Teilchenzahlen stochastische Effekte und umgekehrt. Schließlich wird der Einfluss von zufälligen Fluktuationen auf die Leistungsfähigkeit von Signalpfaden erforscht. Dazu werden simulierte sowie experimentell gemessene Calcium-Zeitreihen stochastisch an die Aktivierung eines Zielenzyms gekoppelt. Das Schätzen des informationstheoretischen Maßes Transferentropie unter unterschiedlichen zellulären Bedingungen dient zur Abschätzung des Informationstransfers. Dieser nimmt mit steigender Partikelzahl zu, ist jedoch sehr abhängig von der momentanen Dynamik (z.B. spikende, burstende oder irreguläre Oszillationen). Die hier entwickelten Methoden, wie der Gebrauch der Divergenz als Indikator für den stoch./det. Übergang oder die stochastische Kopplung und informationstheoretische Analyse mittels Transferentropie, sind wertvolle Werkzeuge für die Analyse von biochemischen Systemen. / Stochastic effects in biochemical networks can affect the functioning of these systems significantly. Signaling pathways, such as calcium signal transduction, are particularly prone to random fluctuations. Thus, an important question is how this influences the information transfer in these pathways. First, a comprehensive overview and systematic classification of stochastic simulation methods is given as methodical basis for the thesis. Here, the focus is on approximate and hybrid approaches. Also, the hybrid solver in the software system Copasi is described whose implementation was part of this PhD work. Then, in most cases, the dynamic behavior of biochemical systems shows a transition from stochastic to deterministic behavior with increasing particle numbers. This transition is studied in calcium signaling as well as other test systems. It turns out that the onset of stochastic effects is very dependent on the sensitivity of the specific system quantified by its divergence. Systems with high divergence show stochastic effects even with high particle numbers and vice versa. Finally, the influence of noise on the performance of signaling pathways is investigated. Simulated and experimentally measured calcium time series are stochastically coupled to an intracellular target enzyme activation process. Then, the information transfer under different cellular conditions is estimated with the information-theoretic quantity transfer entropy. The amount of information that can be transferred increases with rising particle numbers. However, this increase is very dependent on the current dynamical mode of the system, such as spiking, bursting or irregular oscillations. The methods developed in this thesis, such as the use of the divergence as an indicator for the transition from stochastic to deterministic behavior or the stochastic coupling and information-theoretic analysis using transfer entropy, are valuable tools for the analysis of biochemical systems.
28

Manual de software e a transfer?ncia de informa??o: proposta de estrutura de informa??o para o manual no formato impresso e incorporado

Cassiola, Eder 10 February 2006 (has links)
Made available in DSpace on 2016-04-04T18:36:19Z (GMT). No. of bitstreams: 1 Eder Cassiola 1.pdf: 774978 bytes, checksum: 866687d30e76cc8deb843d7ba5ae7f61 (MD5) Previous issue date: 2006-02-10 / This research work is related to the effectiveness of Software Manuals for Library, as a tool for information transfer. The elements that potentially can play a role and assure the user the access to the Software relay on the fields of the Information Science and Technical Communication. In this work the basic requirements for the building of the Software Manuals according to the IEEE 1063 Standard and also to the complete model proposed by Galv?o (2003) are presented. From the integration of the two models the model here proposed is created, which is expected to satisfy small developers and the Free-Software community, incorporating both the printed and the Manual built-in formats. Once the reduced model is accomplished, it follows the empirical-exploratory study where a sample of the Software Manuals for Library is applied with the aim of identifies the presence (or not) of the model elements. Considering the key role of the technological advent in the information transfer, this work considers both supporting formats, establishing a comparison that indicates the trend and advantages from each one. / Pesquisa sobre a efici?ncia dos Manuais de Software para Bibliotecas como meio de transfer?ncia de informa??o. Conceitua-se no ?mbito da Ci?ncia da Informa??o e da Comunica??o T?cnica os elementos que possam influenciar e garantir ao usu?rio o acesso ao Software. Apresentam-se os requisitos b?sicos para a constru??o de Manuais de Software segundo a Norma IEEE 1063 e tamb?m o modelo completo proposto por Galv?o (2003). Da integra??o dos dois modelos surgir? o modelo reduzido por n?s proposto, que busca atender as necessidades de pequenos desenvolvedores e da comunidade de Software Livre, contemplando o formato impresso e o formato incorporado do Manual. Uma vez consolidado o modelo reduzido, seguimos com o estudo emp?rico-explorat?rio onde iremos aplicar a uma amostra dos Manuais de Softwares para Bibliotecas com o objetivo de identificar a presen?a ou n?o dos elementos do modelo. Dada a import?ncia da influ?ncia dos adventos tecnol?gicos na transfer?ncia de informa??o, este estudo contempla os dois formatos deste suporte, estabelecendo um comparativo que aponta as tend?ncias e as vantagens de cada formato.
29

Serviço de informação especializado como elemento de mediação: um estudo a partir da transferência de tecnologias no contexto da agricultura familiar brasileira / -

Pinto, Daniela Maciel 01 October 2015 (has links)
Desde os tempos mais remotos, a agricultura se faz presente na história da humanidade. Formalmente, no Brasil, esta atividade teve início durante a colonização por Portugal, no final do século XV, e exerce importante papel no desenvolvimento econômico brasileiro até os dias atuais. Em termos econômicos, em particular neste setor, a Agricultura Familiar destaca-se pela produção de alimentos e geração de empregos. Apesar disto, esta modalidade passou a integrar as políticas públicas agrícolas apenas em meados dos anos 1990, com o Programa Nacional de Fortalecimento da Agricultura Familiar (Pronaf). Com a estruturação deste programa, diversas instituições que desenvolvem pesquisas agrícolas foram estimuladas a criar soluções tecnológicas, objetivando melhorias dos processos produtivos na agricultura de base familiar. Percebe-se, entretanto, dificuldades para que as tecnologias geradas nessas instituições cheguem aos agricultores familiares e possam ser plenamente utilizadas. Conjectura-se que uma das possíveis causas está relacionada à comunicação, em especial, à forma e o conteúdo das informações produzidas e disseminadas pelas instituições de pesquisas. Assim, tendo em vista que os serviços de informação são meios auxiliares do processo de comunicação da informação, na medida em que seu objetivo maior é manter um acervo dos documentos, onde estão registrados os conhecimentos gerados no desenvolvimento de atividades de pesquisa associadas à agricultura, para acesso daqueles a quem esse conhecimento possa interessar e/ou ser necessário, este trabalho teve como objetivo sistematizar um conjunto de elementos necessários à criação e manutenção de um serviço de informação, destinado a viabilizar a transferência/comunicação da informação tecnológica, no contexto da Agricultura Familiar. Trata-se de uma pesquisa de natureza exploratória, onde buscou-se explicação dentro do contexto histórico, com vistas a situar a Agricultura Familiar brasileira. A partir desta explicação e utilizando-se referenciais da Ciência da Informação, estudou-se Informação Tecnológica, Mediação da Informação, Transferência de Tecnologias e Serviços de Informação Especializados. Como resultado, foi proposto um modelo conceitual de Serviço de Informação Tecnológica, que integra todos os atores do processo de Transferência de Tecnologias, situando o serviço como um meio estratégico para a Gestão da Pesquisa Agropecuária. Apresenta, ainda como resultados, a síntese dessa proposta conceitual, a qual é composta por um conjunto de oito elementos para a estruturação do Serviço de Informação Tecnológica. / Since ancient times, agriculture is present in human history. Formally, in Brazil, the activity started during colonization by Portugal in the late fifteenth century, playing an important role in the Brazilian economic development to the present day. In economic terms, particularly in this sector, Family Farming stands out for food production and job creation. Nevertheless, this mode was integrated with agricultural policies only in the mid-1990s, with the National Programme for Strengthening Family Agriculture (Pronaf). With the structure of this program, a number of institutions that develop agricultural research have been encouraged to create technological solutions, aiming improvement of production processes in family-based agriculture. It is clear, however, there are difficulties for technologies generated in these institutions to reach the farmers and be fully used. It is conjectured that one possible cause is related to communication, in particular the form and content of the information produced and disseminated by research institutions. Thus, given that the intelligence services are auxiliary means to the information communication process, to the extent that its main objective is to maintain a collection of documents, which registered the knowledge generated in the development of research activities related to agriculture, access to those whom this knowledge may concern and / or be required, this study aimed to systematize a set of elements necessary to create and maintain an information service designed to facilitate the transfer / communication of technological information within the context of Family Farming. This consists of a research exploratory nature, which sought to explain, within the historical context, and to situate the Brazilian Family Agriculture. From this explanation and by using benchmarks of Information Science, we studied Information Technology, Information Mediation, Technology Transfer and Specialized Information Services. As a result, we proposed a conceptual model of Technological Information Services, which includes all stakeholders in the Technology Transfer process, situating the service as a key vehicle for Agricultural Research Management. It also presents as a result the synthesis of this conceptual proposal, which consists of a set of eight elements for structuring the Technological Information Service.
30

Efficient Message Passing Decoding Using Vector-based Messages

Grimnell, Mikael, Tjäder, Mats January 2005 (has links)
<p>The family of Low Density Parity Check (LDPC) codes is a strong candidate to be used as Forward Error Correction (FEC) in future communication systems due to its strong error correction capability. Most LDPC decoders use the Message Passing algorithm for decoding, which is an iterative algorithm that passes messages between its variable nodes and check nodes. It is not until recently that computation power has become strong enough to make Message Passing on LDPC codes feasible. Although locally simple, the LDPC codes are usually large, which increases the required computation power. Earlier work on LDPC codes has been concentrated on the binary Galois Field, GF(2), but it has been shown that codes from higher order fields have better error correction capability. However, the most efficient LDPC decoder, the Belief Propagation Decoder, has a squared complexity increase when moving to higher order Galois Fields. Transmission over a channel with M-PSK signalling is a common technique to increase spectral efficiency. The information is transmitted as the phase angle of the signal.</p><p>The focus in this Master’s Thesis is on simplifying the Message Passing decoding when having inputs from M-PSK signals transmitted over an AWGN channel. Symbols from higher order Galois Fields were mapped to M-PSK signals, since M-PSK is very bandwidth efficient and the information can be found in the angle of the signal. Several simplifications of the Belief Propagation has been developed and tested. The most promising is the Table Vector Decoder, which is a Message Passing Decoder that uses a table lookup technique for check node operations and vector summation as variable node operations. The table lookup is used to approximate the check node operation in a Belief Propagation decoder. Vector summation is used as an equivalent operation to the variable node operation. Monte Carlo simulations have shown that the Table Vector Decoder can achieve a performance close to the Belief Propagation. The capability of the Table Vector Decoder depends on the number of reconstruction points and the placement of them. The main advantage of the Table Vector Decoder is that its complexity is unaffected by the Galois Field used. Instead, there will be a memory space requirement which depends on the desired number of reconstruction points.</p>

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