AC/DC adapters mostly employ two-stage topology: Power Factor Correction (PFC) pre-regulation stage followed by an isolated DC/DC converter stage. Low power AC/DC adapters require a small size to be competitive. Among their components, the bulk DC-link capacitor is one of the largest because it should keep the output voltage with low ripple. Also, the size of this capacitor is penalized due to the universal line voltage application. Synchronization through employing leading edge modulation for the first PFC stage and trailing edge modulation for the second DC/DC converter stage can significantly reduce the ripple current and ripple voltage of the DC-link capacitor. Thus, a smaller DC-link capacitance can be used, lowering the cost and size of the AC/DC adapter. Benefits of the synchronous switching scheme were already demonstrated experimentally. However, no mathematical analysis was presented. In this thesis, detailed mathematical analyses in per-unit quantity are given to facilitate the calculation of the DC-link capacitor ripple current reduction with Leading/Trailing Edge Modulation strategies. One of the limitations of leading/trailing edge modulation is that the switching frequencies of the two stages need to be equal to achieve the best reduction of the DC-link capacitor ripple current. The DC-link capacitor ripple current will become larger if the switching frequency of the DC/DC converter is larger than that of the PFC pre-regulator, which blocks us to employ higher frequency for isolated DC/DC converter to reduce its transformer size. This thesis proposed a new Leading/Trailing Edge Modulation strategy to further reduce the DC-link bulk capacitor ripple current when switching frequency of DC/DC converter stage is twice the switching frequency of PFC stage. This proposed pulse width modulation scheme was verified by simulation. Experimental results obtained through digital control based on FPGA are also presented in this thesis.

Background: Forecasting is an instrument that the managers rely upon for their anticipations of the future. Subcontractors control their operations according to the forecast volumes provided by the telecom mobile network equipment suppliers. The information in the forecasts is however not sufficient. Purpose: The purpose of this thesis is to identify and test relevant and available market indicators for prediction of future demand fluctuations on the telecom mobile network equipment market. Realisation: During a number of interviews, factors that are driving the network equipment market were clarified. The aim of this part was to identify possible market indicators. Hypotheses were set up to test the chosen indicators. In the second part, the indicators were tested statistically. Finally, the theoretical and logical support of the results was discussed. Result: To predict future movements in network equipment demand, the market indicators should focus on the telecom mobile operators, and their ability, need, and willingness to make new investments. The market indicators proven to be of most importance after the regression analyses were long-term market interest rates and telecom corporate bond indices.

The contract is essential for the employment, the labor contracts standardize the right and duty for the employment, but the psychological contract is another type of contract. A psychological contract is an employee's belief about the mutual obligations, and it balances the relationship between the employee and his/her organization. In order to promote the corporation's competition, the corporation carries out the restructuring and downsizing strategies, but these strategies are contrary to the critical role that people play in successful organization. Under this condition, the employee's belief and loyalty become more important to maintain the balance of relationship between employee and his organization. When the psychological contract was violated, it may lead to reduce the employee's belief, loyalty, job satisfaction and performance, citizenship behavior, even the employees will turn- over. However, the react may be affected by the individual's discrepancy and external circumstances. The case study is based on the employees in Yueng Foong Yu Paper MFG. CO., LTD. so as to prove if the psychologial contract violation will reduce the employee's performance, and some factors deal with how to affect the violation of psychological contract and work performance. The result is shown as the following: 1. In different SEU(Strategic Entrepreneurial Units¡^, the performance of the employees in the general management office is better than the Fine Paper and Board SEU. 2. In the sexual difference, the task performance of the female employees is better than that of the male ones. 3. In the workage, the employees whose contextual performance are from 11 to 15 years are better than the ones whose workage are over 25 years. 4. The difference between psychological contract violation and work performance is insignificant. 5. When the employees whose orgnizational commitment is higher feel more satified with the organizational benefits, his/her task performance becomes worse. 6. The difference between employability, personal characteristics and work performance is significant. 7.The differecne between relationship of employers and employees and contextual performance is significant.

AC/DC adapters mostly employ two-stage topology: Power Factor Correction (PFC) pre-regulation stage followed by an isolated DC/DC converter stage. Low power AC/DC adapters require a small size to be competitive. Among their components, the bulk DC-link capacitor is one of the largest because it should keep the output voltage with low ripple. Also, the size of this capacitor is penalized due to the universal line voltage application. Synchronization through employing leading edge modulation for the first PFC stage and trailing edge modulation for the second DC/DC converter stage can significantly reduce the ripple current and ripple voltage of the DC-link capacitor. Thus, a smaller DC-link capacitance can be used, lowering the cost and size of the AC/DC adapter. Benefits of the synchronous switching scheme were already demonstrated experimentally. However, no mathematical analysis was presented. In this thesis, detailed mathematical analyses in per-unit quantity are given to facilitate the calculation of the DC-link capacitor ripple current reduction with Leading/Trailing Edge Modulation strategies. One of the limitations of leading/trailing edge modulation is that the switching frequencies of the two stages need to be equal to achieve the best reduction of the DC-link capacitor ripple current. The DC-link capacitor ripple current will become larger if the switching frequency of the DC/DC converter is larger than that of the PFC pre-regulator, which blocks us to employ higher frequency for isolated DC/DC converter to reduce its transformer size. This thesis proposed a new Leading/Trailing Edge Modulation strategy to further reduce the DC-link bulk capacitor ripple current when switching frequency of DC/DC converter stage is twice the switching frequency of PFC stage. This proposed pulse width modulation scheme was verified by simulation. Experimental results obtained through digital control based on FPGA are also presented in this thesis.

<p>Background: Forecasting is an instrument that the managers rely upon for their anticipations of the future. Subcontractors control their operations according to the forecast volumes provided by the telecom mobile network equipment suppliers. The information in the forecasts is however not sufficient. </p><p>Purpose: The purpose of this thesis is to identify and test relevant and available market indicators for prediction of future demand fluctuations on the telecom mobile network equipment market. </p><p>Realisation: During a number of interviews, factors that are driving the network equipment market were clarified. The aim of this part was to identify possible market indicators. Hypotheses were set up to test the chosen indicators. In the second part, the indicators were tested statistically. Finally, the theoretical and logical support of the results was discussed. </p><p>Result: To predict future movements in network equipment demand, the market indicators should focus on the telecom mobile operators, and their ability, need, and willingness to make new investments. The market indicators proven to be of most importance after the regression analyses were long-term market interest rates and telecom corporate bond indices.</p>

XX amžiuje Lietuvos įstatymų leidėjas nesukūrė savo nacionalinio civilinio proceso kodekso, o 2003 m. sausio 1 d. įsigaliojo naujasis Lietuvos Respublikos civilinio proceso kodeksas, įtvirtindamas socialinio civilinio proceso modelį bei įnešdamas naujoves, pokyčius Lietuvos visuomenei. Pasirinkta magistro baigiamojo darbo tema „Teismo vaidmens pokyčiai XXI amžiuje“ yra aktuali tiek teorine, tiek praktine prasme, nes šios temos kompleksinio ištyrimo ir išnagrinėjimo nėra nei Lietuvos, nei užsienio specialistų darbuose. Šio darbo objektas yra teismo vaidmuo nacionaliniame civiliniame procese ir jo pokyčiai. Darbo tyrimo dalykas yra teisės aktai, reglamentuojantys teismo vaidmenį civiliniame procese, sąlygojantys teismo vaidmens pokyčius naujajame XXI amžiuje bei nustatantys civiliniame procese dalyvaujančių asmenų ir teismo teises ir pareigas. Magistro baigiamuoju darbu siekiama išanalizuoti teismo vaidmens nacionaliniame civiliniame procese pokyčius XXI amžiuje. Pirmoje dalyje teoriniu aspektu atskleidžiama teismo vaidmens samprata. Antroje dalyje identifikuojami civilinio proceso rungimosi ir tardomojo modelių skirtumai, apibrėžiama socialinio civilinio proceso modelio esmė, lyginamas teismo vaidmuo Lietuvos civiliniame procese prieš ir po naujojo civilinio proceso kodekso įsigaliojimo, atskleidžiant senojo kodekso trūkumus ir naujojo privalumus bei apibrėžiant naujojo civilinio proceso kodekso tikslą ir principus, nustatant rungimosi ir dispozityvumo principų įtaką teismo... [toliau žr. visą tekstą] / There was no national Code of Civil procedure in the 20th century in Lithuania but on 1 January 2003 the new Code of Civil procedure of the Republic of Lithuania came into force. It established the model of social civil procedure and brought innovations and changes for the society of Lithuania. The chosen subject of the master’s thesis Changes of the role of court in the 21st century is actual both in theoretic and practical sense as there is no complex analysis or research of this theme in the works of specialists not only from Lithuania but also from the foreign countries. The object of this work is the court’s role in the national civil procedure and changes of this role. The legal acts which regulate the role of the court in the civil procedure, which cause the changes of the court’s role in the new 21st century and establish the rights and duties of the persons who participate in the civil procedure, is the subject of research. The aim of the final paper is to analyze the changes of the court’s role in the national civil procedure in the 21st century. The conception of the Court’s role from the theoretic point of view is revealed in the first part of the work. In the second part of the paper the differences between the investigating and competing models are identified, the essence of the model of civil procedure is described, the Court’s role in the Lithuanian civil procedure before and after the new Code of Civil procedure came into force is compared while revealing the... [to full text]

Vadovavimas švietimo įstaigai įgauna vis didesnę svarbą ir įtaką veiklos rezultatams, bei įstaigos prestižui. Švietimo įstaigos vadovai turi būti pasirengę įstaigos veiklos kaitai, kuri užtikrintų mokslo pažangą, atitiktų darbuotojų, mokinių ir studentų lūkesčius, patenkintų poreikį įgyti pačias naujausias žinias ar įgūdžius ir sudarytų tam sąlygas bei galimybes. Tokiame kontekste naujai suprantama švietimo įstaigos vadovo, kaip vadybininko vaidmuo ir veikla. Vadovai skatinami keisti savo veiklos stilių ir formas: gebėti dirbti komandoje, priimti švietimo įstaigos kaitai reikšmingus sprendimus, atlikti įvairias papildomas užduotis, veiksmingai bendrauti, stebėti ir vertinti išorės ir vidaus aplinką, užtikrinti teikiamų paslaugų kokybę, siekti efektyvios veiklos ir kt. Todėl lyderystės savybės svarbios visų lygių vadovų veikloje. Darbo objektas: Lyderystės savybės ir gebėjimai švietimo įstaigų vadovų veikloje Darbo tikslas: Atskleisti švietimo įstaigos vadovams reikalingas lyderių savybes ir gebėjimus. Darbe apžvelgta lyderystės samprata, išskirti visų lygių švietimo įstaigų vadovams reikalingi gebėjimai ir būdingos savybės, aptarta visų lygių vadovų lyderių įtaka švietimo įstaigų veiklai, išskirtos pedagogų vadybinės funkcijos, kompetencijos ir jiems reikalingos lyderių savybės, pateikta pedagogų kompetencijų struktūra ir kiekvienai kompetencijų grupei priskirtos lyderiams būdingos savybės ir gebėjimai. Atliktas empirinis tyrimas, kuriuo buvo siekiama išsiaiškinti visų lygių... [toliau žr. visą tekstą] / Managing educational institution is taking on a more important role and influence on the activity results and prestige of the institution. Pupils and students have to adapt to the changes of educational system, which seek to create an appropriate educational environment for teaching / learning. Teachers must become educated and versatile leaders who will show the right way for the future generations. The heads of educational institutions must be ready for the changes of the institution's activities which should ensure scientific progress, meet staff and students’ expectations, satisfy the need for acquiring the most current knowledge and skills and create conditions and opportunities to achieve them. In such a context there is a new understanding of the head of an educational institution, as a manager’s and leaders are encouraged to change styles and forms of their actions – be able to work in team, accept significant decisions due to the changes in educational institutions and perform various additional tasks - communicate effectively, monitor and evaluate the external and internal environment, ensure quality of service, achieve effective actions etc. Therefore, leadership characteristics are important for all levels of management activities. Object of the work: Leadership qualities and skills in the management activities of educational institution. Aim of the work: To reveal leadership qualities and skills needed for the managers of educational institutions. A performed... [to full text]

Many papers have been presented on the study of change points detection.　Nonetheless, we would like to point out that in dealing with the time series with switching regimes, we should also take the characteristics of change periods into account.　Because many patterns of change structure in time series exhibit a certain kind of duration, those phenomena should not be treated as a mere sudden turning at a certain time. In this paper, we propose procedures about change periods detection for nonlinear time series.　One of the detecting statistical methods is an application of fuzzy classification and generalization of Inclan and Tiao’s result.　Moreover, we develop the genetic-based searching procedure, which is based on the concepts of leading genetic model.　Simulation results show that the performance of these procedures is efficient and successful.　Finally, two empirical applications about change periods detection for Taiwan monthly visitors arrival and exchange rate are demonstrated.

Made available in DSpace on 2016-12-23T14:00:38Z (GMT). No. of bitstreams: 1 FOLHA DE ROSTO A SUMARIO.pdf: 114961 bytes, checksum: 8ff6dbc0edc8b0f0942b2113ba85fdfd (MD5) Previous issue date: 2008-05-01 / Leading indicators are a method based on the examination of a cycle as an empirical phenomenon; the concept of business cycles appeared in middle of the 20th century by Wesley Mitchell and Arthur Burns. It is one technique that searchs to anticipate the behavior of one given serie (reference). Diverse methods exist for its construction. In this study it is considered a construction of an indicator for Produção Industrial Brasileira (Brazilian Industrial Production) with the objective of calculating the probabilities of the turning point. For this, the series have been filtered and standardized. The Granger criterion gave basis for the selection. A balance with cross correlograms of the chosen sequencies (series) occurs for the composition of the indicator and for the calculation of the probability of reversion the methodology of Neftçi (1982) was used. Around 290 sequencies (series) were analyzed and only 9 were selected for the construction of the indicator. Some samples periods of time have been studied from January of 1992 to December of 2006 for the calculation of the probabilities, these also have been calculated by another method (probit) to compare with the methodology of Neftçi. The results demonstrate the great utility of this tool for forecasting of the cyclical movements of economic series. It is a technique that can be used to help with public politics and private policy making. / Indicadores antecedentes é um método baseado no exame do ciclo como um fenômeno empírico; surgiu do conceito de ciclos de negócio em meados do século XX por Wesley Mitchell e Arthur Burns. É uma técnica que busca antecipar o comportamento cíclico de uma dada série (referência). Existem diversos métodos para sua construção. Neste estudo propõe-se a construção de um indicador para a Produção Industrial Brasileira com o objetivo de calcular as probabilidades de mudança de fase ou reversão dos ciclos (turning point). Para isto as séries foram filtradas e padronizadas. A seleção se deu por um critério de causação (Causalidade de Granger). Para a composição do indicador, foi realizada uma ponderação com a correlação cruzada das séries escolhidas devidamente defasadas e, por fim, para o cálculo da probabilidade de reversão foi utilizada a metodologia de Neftçi (1982). Analisou-se cerca de 290 séries e somente nove foram selecionadas para a construção deste indicador. Estudaram-se alguns períodos amostrais, entre 01/1992 a 12/2006, para o cálculo das probabilidades, estas também foram calculadas por outro método (probit) para confronto com a metodologia de Neftçi. Os resultados demonstram a grande utilidade de tal ferramenta para previsão dos movimentos cíclicos de séries econômicas. É uma técnica que pode ser utilizada como orientação para políticas públicas e decisões privadas.

Submitted by Liliane Ferreira (ljuvencia30@gmail.com) on 2018-10-22T12:54:06Z No. of bitstreams: 2 Dissertação - Gabriela Peixoto Vieira Silva - 2014.pdf: 1666300 bytes, checksum: e696737b500c4db63727f87491433167 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2018-10-22T14:17:06Z (GMT) No. of bitstreams: 2 Dissertação - Gabriela Peixoto Vieira Silva - 2014.pdf: 1666300 bytes, checksum: e696737b500c4db63727f87491433167 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2018-10-22T14:17:06Z (GMT). No. of bitstreams: 2 Dissertação - Gabriela Peixoto Vieira Silva - 2014.pdf: 1666300 bytes, checksum: e696737b500c4db63727f87491433167 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2014-09-15 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / This work purpose to investigate the female participation in leading positions on political parties. The hypothesis that guides the research is that this participation is low, corroborating the existence of a under representation of women in leading positions on the analyzed political parties. This under representation is analyzed on two directions: the function/position in the party which identify or not the inclusion of women in the elite party and the identification of elements that shape this participation. The research is divided in two different parts one is documental, which it will be approached positions occupied by women, and finally the analysis of the interviews with male and female leadership from the parties analysed: PMDB, PSDB, DEM, PT and PCdoB. / O objetivo deste trabalho é investigar a participação e a representação feminina nos cargos de direção de partidos políticos em Goiás. A hipótese que norteia a pesquisa é que a intensidade desta representação é baixa, corroborando a existência de uma sub-representação feminina política nos cargos de direção dos partidos políticos analisados. Essa sub-representação é analisada em duas dimensões: funções/cargos dentro do partido que identifiquem ou não a inclusão de mulheres na elite partidária e a identificação de elementos que moldam essa participação. A pesquisa está dividida em duas etapas – documental, em que se abordará cargos e funções ocupados pelas mulheres; e por fim, análise das entrevistas em profundidade com lideranças masculinas e femininas dos partidos analisados: PMDB, PSDB, DEM, PT e PCdoB.