• Journal of Electrical Engineering and Technology
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• 제13권5호
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• pp.1886-1900
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• 2018

This paper proposes a confronting feedback control structure and controllers for positive output elementary super lift Luo converters (POESLLCs) working in discontinuous conduction mode (DCM). The POESLLC offers the merits like high voltage transfer gain, good efficiency, and minimized coil current and capacitor voltage ripples. The POESLLC working in DCM holds the value of not having right half pole zero (RHPZ) in their control to output transfer function unlike continuous conduction mode (CCM). Also the DCM bestows superlative dynamic response, eliminates the reverse recovery troubles of diode and retains the stability. The proposed control structure involves two controllers respectively to control the voltage (outer) loop and the current (inner) loop to confront the time-varying ON/OFF characteristics of variable structured systems (VSSs) like POESLLC. This study involves two different combination of feedback controllers viz. the proportional integral controller (PIC) plus sliding mode controller (SMC) and the fuzzy logic controller (FLC) plus SMC. The state space averaging modeling of POESLLC in DCM is reviewed first, then design of PIC, FLC and SMC are detailed. The performance of developed controller combinations is studied at different working states of the POESLLC system by MATLAB-Simulink implementation. Further the experimental corroboration is done through implementation of the developed controllers in PIC 16F877A processor. The prototype uses IRF250 MOSFET, IR2110 driver and UF5408 diodes. The results reassured the proficiency of designed FLC plus SMC combination over its counterpart PIC plus SMC.

• 수산해양교육연구
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• 제13권1호
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• pp.99-116
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• 2001

Testing is a procedure used to measure a sample of behaviour in order to discover how well a seafarer performs, usually in comparison with others, or compared with identified performance criteria. In this context It is important that the test, in whatever form it is being used, yields consistent results by being valid, reliable and practical. Whilst we can only take a sample of a person's knowledge or comprehension about topic in this way, testing methods do provide a more reliable estimate of performance than most other observational techniques; unsystematic or irregular observation being too unreliable. The method of examination has been specified in the provisions of Regulation 12 of the Decree of the ship officers act as followings. Other necessary matters for conducting oral and written examinations have been set out by the Minister. But written examination is too shortage of period and small number of question to cover the qualification of each level and oral test is just simple and namely Traditionally, written examinations have been provided as the only means for determining the acquisition of knowledge by the mariner. Typically, the examination formats have taken the format of either an essay or multiple choice examinations. Essay items, used in the vast majority of subject examination(not in Korea), consisted of three basic types: situational, descriptive and computational. The level of certificate being examined determined the number and mix of the type of essay questions selected. Oral question has again been used by assessors of seafarer in a wide variety of contexts. Also, oral questioning is often used when observation of performance is undertaken to ask why a certain action has been taken, or to be broaden the scope of what has been observed. At end, Each techniques have their own advantage and disadvantage, so we have to choose some or all of the following techniques, depending upon the certificate, qualification or job for which the trainee is aiming. But in high lank, we have to use both of essay type and multiple choice and with enough time of oral test at least 30 minutes. Who would be the assessor? According to the STCW Code Section A-I/6, instructors, supervisor and assessors are appropriately qualified for particular types and levels of training or assessment of competence of seafarers either on board or ashore, as required under the Convention, in accordance with the provisions of this section.

• 유통과학연구
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• 제16권7호
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• pp.77-86
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• 2018

Purpose - In the insurance distribution channel, the salespeople plays a role of representing the company, and recognizes the needs of the customers and plays a role in responding to them. Therefore, their turnover can have a great influence on the company performance. The purpose of this study is to investigate the structural relationship between salespeople's personal - environmental fit and organizational commitment and turnover intention. Research design, data, and methodology - Data collection was conducted a self-filling questionnaire for salespeople for about one month from July 24, 2017 to August 30, 2017. The subjects of the questionnaire were the insurance salespeople who work in the sales line such as K life, S fire. A total of 450 copies were distributed and 432 copies of the questionnaire were used for final analysis. The analysis program used SPSS 22.0 and AMOS 22.0 programs. Analysis method was Frequency Analysis, Reliability & Confirmatory Factor Analysis, Correlation Analysis and Structural Equation Model(SEM). Results - As a result of Hypothesis 1, Person-Supervisor Fit had significant influence only on Continuance Commitment. Person-Job Fit did not have a significant effect on Organizational Commitment. Person-Coworker Fit had a significant effect on Continuance Commitment and Affective Commitment. Person-Organization Fit had a significant impact on Affective Commitment. Therefore, only , , , , were adopted. As a result of Hypothesis 2, Continuance Commitment had a significant effect on turnover intention. Therefore, only was adopted. Conclusions - This study suggests that it is necessary to manage the human resources in the sales field through studies related to salespeople's extension of the research scope and salespeople's turnover intention. Based on the results of this study, the conclusion suggests some implications for the efficient human resources management of insurance companies in sales channels. It is expected that it will be helpful for the salespeople to find out what kind of Person-Environment Fit affects the organizational commitment and how to manage the organizational commitment among the three dimensions of organizational commitment to reduce turnover intention.

• 벤처창업연구
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• 제4권1호
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• pp.89-111
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• 2009

점점 높아져 가는 프랜차이즈 사업에 대한 관심과 상반되게 프랜차이즈 사업에 관한 연구는 고객만족을 위한 연구와 단편적 운영 지침서들에 머무를 뿐 운영자 시각에서 성공요인을 분석하고, 창업단계 및 운영단계로 나눠 실증한 연구는 찾아보기 어렵다. 또한, 식품분야의 프랜차이즈 사업에 대한 연구가 주를 이루고 었어 식품과 비식품 프랜차이즈 사업에 영향을 미치는 요인에 관한 비교연구는 지금까지 제대로 이뤄져 오지 못했다. 이에 본 연구는 프랜차이즈 사업의 단계별 업종별 성과에 영향을 미치는 요인을 분석하고 이를 토대로 국내 프랜차이즈 사업을 준비하는 예비창업자들이 실천해야 할 성공전략을 제시하였다. 연구결과 창업단계의 성장요인으로 사업적성의 여부, 사업조직의 여부, 사업아이템의 적합성, 경쟁구도와 본사자문의 여부가 선별되었고, 운영단계의 성공요인으로는 슈퍼바이저의 능력, 본사와 가맹점의 마케팅 능력, 본사지원의 유무, 고객관리능력, 직원만족이 도출되었다.

• 한국조경학회지
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• 제41권1호
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• pp.60-70
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• 2013

본 연구는 조경공사 표준시방서 식재공사의 분류체계, 기술방식, 품질기준의 개정시기별 변화특성을 분석하고, 국외 사례와의 비교를 통하여 개선방향을 제시하고자 하였다. 이에 본 연구의 결과 및 제언은 다음과 같다. 1. 개정을 통해 다양한 세부공종이 신설 수정되었으나 상 하위분류가 맞지 않아 시방내용이 상충되고 있으므로 비슷한 공사끼리의 재분류가 필요하다. 2. 시방서 내용을 용이하게 전달하기 위한 기술방식으로 수정이 이루어졌다. 그러나 구체성이 떨어지는 애매모호한 표현과 용어로 유지되고 있는 굴취시 뿌리분의 깊이, 지주재 강도에 관한 내용은 수정이 필요하다. 또한 표토의 채취시기, 약제 살포시기 등은 계량화될 필요가 있으며, 시방규정의 공정성을 고려하여 감독자의 지시에 따르도록 작성된 기준은 수정되어야 한다. 3. 시대적 패러다임과 사용자의 요구를 반영한 품질기준이 제 개정되었으나 구체적이지 않아 수정이 필요하며, 관련 기준들의 국외 사례를 참고하여 수목재료의 품질수준, 식재적기, 굴취시 뿌리분의 크기, 성능기준 등을 개선해야 한다. 개정을 통해 식재공사의 세부공종별 재료 및 시공방법에 대한 내용은 갖춰졌다. 그러나 구체성이 떨어지고 명확하지 않은 기준들로 시방서의 현장 활용을 저해하고 있다. 이에 표준시방서의 분류체계, 기술방식, 품질기준의 문제점 도출과 개선방향의 제시가 필요하며, 이는 향후 표준시방서 개정시 참고자료가 될 수 있다.