• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2003년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
• /
• pp.213-215
• /
• 2003

The continuing need for more compact and reliable switching power supplies have aroused a renewed interest in a well founded control technique the Magnetic Amplifier(Magamp). Magamp have some advantages of higher power density simple control circuit, good regulation, high frequency and high performance. The control method with magamp become attractive solutions for high current post regulated output applications. In this study, it is proposed that the magamp technique in flyback converters with multiple output windings. Operation principle of the proposed approach is described and a description of magamp control loop behavior is given first from a circuit level point of view. Then the focus is shifted to look at the same issue from the block diagram point of view. Experimental verifications on 50W multiple output flyback converter are conducted. Simulations and experimental results show that the proposed approach is high efficiency and voltage regulation of the auxiliary output is excellent.

• 한국IT서비스학회지
• /
• 제6권3호
• /
• pp.209-224
• /
• 2007

Currently, the world has experienced a mass exodus of workforce from the manufacturing industry to service related industry. In addition, the changes of industry structure toward service industry have been gradually accelerated. We have felt that it is time to conduct researches about IT service systematizing and discovering the essence of service itself with scientific and synthetic ways based on Service Science. For Service Science researchers, service identification is regarded as a difficult activity when they contact it for the first time and they want to apply it real environment. In reality, there exist mismatches between business and IT service to identify service since service is identified from the business point of view in Service Science area and it is identified from the technical point of view in IT service area. In this paper, we have conducted researches about service identification placed on the first priority and regarded as difficult area in service-oriented business area. To lessen aforementioned difficulties, we propose procedures and methods for extracting and identifying service in the viewpoint of business process. We conducted case study and comparison with existing researches to verify the applicability and the excellence of our proposal.

• 산업공학
• /
• 제14권2호
• /
• pp.164-171
• /
• 2001

We suggest a Business Performance Information System with Knowledge Discovery in Databases(KDD) as a key component of integrated information and knowledge management system. The proposed system measures business performance by considering both VA(Value-Added), which represents stakeholder's point of view and EVA(Economic Value-Added), which represents shareholder's point of view. In modeling of Business Performance Information System, we apply the following KDD processes : Data Warehouse for consistent management of a performance data, On-Line Analytic Processing(OLAP) for multidimensional analysis, Genetic Algorithms for exploring and finding dominant managing factors and Analytic Hierarchy Process(AHP) for applying expert's knowledge and experience. To demonstrate the performance of the system, we conducted a case study using financial data of Korean automobile industry over 16 years from 1981 to 1996, which is taken from database of KISFAS(Korea Investors Services Financial Analysis System).

• 한국컴퓨터산업학회논문지
• /
• 제9권2호
• /
• pp.77-82
• /
• 2008

The diversity reception and the equal gain combining technique are applied to the compensation of the distortion of channel, which occurs in transmission of data at rapid speed. DSSS BPSK system which has the receiving structure with the compensation algorithm is formed on the diversity branch, and the characteristics of the system are evaluated at the view point of the average bit error rate due to the SNR. In addition, the multi-tap update algorithm which is superior for the data compensation is suggested. Moreover, using the American Joint Technical Committee PCS RF channel characterization and system deployment model standard, the suggested multi-tap update algorithm is compared and analyzed with the view-point of the average bit error rate and convergence speed for evaluating the realistic efficiency of the system.

• Journal of Information Science Theory and Practice
• /
• 제5권3호
• /
• pp.6-14
• /
• 2017

Workplace knowledge sharing is a complex process and there are a large number of studies in the area. In this article three theoretical approaches in library and information science are used to discuss knowledge sharing in the workplace. The approaches are information behavior, social capital, and information culture, and they bring important insights that need to be considered from a holistic management point of view when it comes to knowledge sharing. The individual's relation to different levels of context is important, meaning both in relation to work roles, work tasks, situations, organizational structures, and culture. The frameworks also shed light on where and how knowledge sharing activities are present in the organization. From a knowledge management point of view, it is important to acknowledge that when knowledge is valued, there is also an awareness of the knowledge sharing activities. Also, in addition to more traditional views of context, the frameworks bring forward different views on context, such as time and space as contextual factors.

• 가정과삶의질연구
• /
• 제11권1호
• /
• pp.1-11
• /
• 1993

The purpose of this study is to review histoiral development of Gye from the home welfare point of view. The origin of gye can be found ancient primative society but it was widely organized middle of{{{{ {Y }_{1 } }} }} D ynasty of Gye was originally wellfare o r ganization but changed to financial organization later. Gye can be classified as an organization 1) to realize common purpose as a whole community & 2) to realize common purpose as a household or individual Home wellfare function of Gye are studied on 8 areas,. In order to revitalize original Gye spirit in he modern society following was suggested: 1) For the rural village to be unified under Durae's spirit and organize Farming Company; 2) For the urban community to link needy people's Gye and above middle class people's Gye and utilize as civil wellfare organization ; 3) For financial organizaton to develop a pool financial product.

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 1998년도 추계종합학술대회
• /
• pp.165-168
• /
• 1998

Re-oxidized nitrided oxides which have been investigated as alternative gate oxide for Metal- Oxide -Semiconductor field effect devices were grown by conventional furnace process using pure NH$_3$ and dry $O_2$ gas, and were characterized via a Fowler-Nordheim Tunneling electron injection technique. We studied Ig-Vg characteristics, leakage current, $\Delta$Vg under constant current stress from electrical characteristics point of view and TDDB from reliability point of view of MOS capacitors with SiO$_2$, NO, ONO dielectrics. Also, we studied the effect of stress temperature (25, 50, 75, 100, and 1$25^{\circ}C$). Overall, our results indicate that optimized re-oxidized nitrided oxide shows improved Ig-Vg characteristics, leakage current over the nitrided oxide and SiO$_2$. It has also been shown that re-oxidized nitrided oxide have better TDDB performance than SiO$_2$ while maintaining a similar temperature and electric field dependence. Especially, the Qbd is increased by about 1.5 times.

• 한국정보통신학회논문지
• /
• 제9권4호
• /
• pp.811-815
• /
• 2005

We theoretically studied synchronization of chaotic oscillation in semiconductor lasers with chaotic light injection feed-back induced chaotic light generated from a master semiconductor laser was injected into a solitary slave semiconductor laser. The slave laser subsequently exhibited synchronized chaotic output for a wide parameter range with strong injection and frequency detuning within the injection locking scheme. We also analytically examined chaos synchronization based on a linear stability analysis from the view point of synchronization based on a linear stability analysis from the view point of modulation response of injection locked semiconductor lasers to chaotic light signal.

• 유통과학연구
• /
• 제14권3호
• /
• pp.31-38
• /
• 2016

Purpose - This paper reviews the change of steel export-import structure between Japan and China by the courtesy of international business reference index and stress to analyze comparative advantage under the circumstance of time-series evaluating database by 3 indexes. Research design, data, methodology - Per economic phase, both China-Japan have mutually a complementary base. Under this kind of view point, the reason why to conduct this study is to realize how this 2 country's trade competitiveness should be improved and strengthened. Results - Under this research data and analysis outcomes, bilateral intra-economy's potential supplementation is enormous. Additionally, expected benefits from here are so sufficiently assured as we compare them with any other regional economic integrated society. Conclusions - When we review our economic point of view, Northeast economic cooperations between China and Japan can provide a chance for industrial technological cooperations not only in steel business but also in other business areas. Come to think of the circumstance to accelerate competitions between 2 country's industries past time and acknowledge concrete resource supplier including expanding export market and diversification.

• 대한수학교육학회지:학교수학
• /
• 제12권1호
• /
• pp.61-77
• /
• 2010

수학 학습에서 수학 용어의 의미를 이해하는 것은 그것과 관련된 학습 내용을 이해하고 활용하는데 중요한 역할을 한다. 수학 용어의 의미를 잘 이해하기 위해서는 용어를 학생의 이해 수준과 언어 능력에 맞도록 적절하게 제시하여 일관성 있게 사용하고 표현하는 것이 필요하다. 본 연구에서는 초등학교 수학 교과서에 나타난 용어의 의미를 서술하여 사용하는 방식과 표현이 부적절한 사례를 수학적 관점과 일관성 관점에서 고찰하여 용어 사용과 표현의 적절성에 대한 시사점을 얻고자 한다.