• 융복합기술연구소 논문집
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• 제3권1호
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• pp.19-23
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• 2013

This study is concerned with air-conditioning system in use of thermoelectric device. It is introduced that the well designed structures for better cooling & heating performance with high efficiency. And also it is performed that the system performance test of four types trial products for the use of hybrid commercial vehicle. System performance is affected by many component parts, especially heat sink design & power control method. It is applied that dual extrusive fin tube with buffer zone for the effective radiating of circulating liquid in tube. And also it is applied that power supply method with constant-current system. It is attained that system cooling capacity is 1.2kW, COP is 0.95.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.67-68
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• 2015

This paper describes humanoid eye drive system. The eye drive system has been developed by using more than two motors for operating 2 degree-of-freedom. It needs to accomplish purpose for operating the robot eye like movement of the human eye. However it makes problems that it increases energy consumption and requires relatively large space of operating system. Thus it needs technology to minimize and have high efficiency. This paper introduces the adequacy of perviously eye drive system. And it shows research value of the spherical motor system.

• 한국IT서비스학회지
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• 제19권2호
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• pp.83-92
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• 2020

The current technology drain at small and medium-sized enterprises in Korea is very serious. According to the National Intelligence Service's survey data, 69 percent of technology leaks are made through employees of small and medium-sized enterprises. A document security system was introduced to compensate for the problem. However, small and medium-sized enterprises are not doing well due to their poor environment. Therefore, it proposes a document security system suitable for small businesses by developing a location information machine learning system that automatically creates a document security Green Zone through learning, and an ECM-based electronic document leakage prevention system that manages generated Green Zone information by reflecting it into the document authority system. And step by step, propose a universal solution through cloud services..

• 대한안전경영과학회지
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• 제10권1호
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• pp.129-137
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• 2008

The studies on the logistics has been mainly centered on the logistics information system and logistics performance on the supply chain for the enterprise's profit making. For sustainable development, it's being required the construction of recycling-oriented system, and it's also necessary to construct the efficient system not only in forward but in reverse channel. In addition, it's required to construct information system for supporting reverse logistics smoothly. In this study of manufacturing enterprises, recognition on the environmental problems is set as the adaptation degree to the national environmental regulations and enterprise's concern to the environmental logistics, and it presents the direction through analyzing the effects of such environmental logistics recognition on reverse logistics information system and performance. In order to achieve these aims, it was performed through combining philological and positive studies.

• 한국시스템다이내믹스연구
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• 제14권1호
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• pp.89-104
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• 2013

This study aims to explore the potentials of System Dynamics as a tool to understand the community welfare practice by paying attention to the strengths of System Dynamics to complement the weaknesses of the theories and studies of the community welfare practice. The contents of this study are as follows. First, it draws the limitations of its theories and studies by reviewing the literatures related. Second, it outlines the characteristics of the community welfare practice process as well as the strengths of System Dynamics as a tool to understand the community welfare practice. Third, it presents a causal loop model of System Dynamics applied to the community welfare practice process. Lastly, it concludes with the suggestions and implications of the key research findings. This study is expected to be a basic study to highlight the potentials of System Dynamics as a tool to understand the community welfare practice.

• 한국IT서비스학회지
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• 제5권2호
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• pp.39-58
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• 2006

The e-business strategies ultimately pursue creating the maximal value for customers through the competitive advantages and business opportunities newly created on the basis of information technologies. For the realization of e-business strategies, the successful implementation and operation of e-business system must be the crucial activities in and out of an organization. Therefore, in physical world, there were lots of interests that what kind of key factors can lead the success of e-business system. Moreover, in the field of academia also, there have been many research results for investigating and finding out the key success factors for e-business system. However, the perceptual level of the significance of key success factors that organization members perceive can be changed over each phase of system life cycle such phases as introduction, growth, maturity, and decline. This study investigated that there might be significant differences in the perceptual level regarding importance of success factors among phases of system life cycle.

• Journal of Advanced Marine Engineering and Technology
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• 제36권7호
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• pp.919-926
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• 2012

In order to control a LTI(Linear Time Invariant) system subjected to system noise and measurement noise, first of all, it is necessary to estimate the state of system with reliability. Kalman filtering technique has been widely used to estimate the state of the stochastic LTI system with stationary noise characteristics because of its estimation ability versus algorithm simplicity. However, it often fails to estimate the state of the LTI system of which system parameter uncertainty exists partly and/or input uncertainty exists. In this paper, a new estimation technique based on Kalman filter is suggested for stochastic LTI system under parameter uncertainty and/or input uncertainty. A fuzzy estimation algorithm against uncertainties is introduced so as to compensate the state estimate filtered by Kalman filter. In order to verify the state estimation performance of the suggested technique, several simulations are accomplished.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 추계학술대회 논문집(I)
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• pp.156-161
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• 2003

Korean High Speed Train (KHST) has been tested on high speed line in JungBu site since it was developed in 2002. The data acquisition system was used to test successfully the on-line test for proving the dynamic performance of KHST. The recognition of system vibration mode for railway vehicle is essential to understand the characteristics of design for dynamic system and diagnose the dynamic problems of vehicle system during test and operation. But, up to now, there are the efforts to know the system vibration mode within limit of theoretical field only, not experimental approach with systematic method. The theoretical results are too reliable to apply to real design problem, because it is theoretically based on the homogeneous linear system although the real system have the nonlinear characteristics and vary the environmental conditions. Therefor, in this paper, it is proposed the efficient method of vibration analysis for rail vehicle system and this method apply to KHST to recognize the vibration mode characteristics of it. The results show that this method is able to make the system vibration modes for KHST clear.

• 기술혁신학회지
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• 제11권4호
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• pp.565-591
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• 2008

산업혁신체제론과 공급체인분석을 분석방법론으로 하는 본 연구는 대만과의 비교 관점에서 국내 IT SoC산업의 혁신체제 발전방안을 분석했다. 대만 IT SoC산업은 정부의 국내기업 육성정책하에서 신죽과학산업단지의 조성 이후 급속한 성장을 했다. 대만 IT SoC산업의 공급체인 내에서 파운드리업체와 팹리스업체 간 장기적인 협력네트워트는 양자의 동반 성장을 이끌고 있다. 이를 토대로 해서 대만 IT SoC산업은 다양성 창조와 선택의 과정을 거쳐, 공진화의 가능성을 열어놓고 있다. 반면 국내 IT SoC산업은 공급체인 내에서 팹리스업체와 파운드리업체 간 협력네트워크가 구축되지 않은 가운데, 최근 팹리스업체와 시스템업체 간 협력네트워크도 붕괴되고 있기 때문에 공진화의 가능성은 제약되어 있다. 이를 시스템 실패의 관점에서 보면, 국내 IT SoC산업은 행위자들의 협력 부족으로 보완적 자산이 활용되지 않고 상호보완적 학습이 저지되는 상호작용 실패가 나타나고 있음을 의미한다. IT SoC산업에서는 공급체인의 효율화가 경쟁력의 핵심이기 때문에 상호작용 실패를 보정하는 것이 국내 IT SoC산업의 핵심과제로 제기되고 있다. 국내 현실을 고려해 볼 때, 파운드리업체들의 경쟁력이 워낙 취약하기 때문에 팹리스업체와 파운드리업체 간 협력 네트워크 구축은 상당기간 불가능할 것이다. 그러므로 상호작용 실패의 보정은 팹리스업체와 시스템업체 간 협력네트워크의 강화에 초점을 맞추어야 한다. 이를 위한 구체적인 방안으로서 공동개발의 확대, 가교 조직의 활성화, 지분참여의 세 가지가 제시될 수 있다.

• 한국IT서비스학회지
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• 제12권1호
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• pp.33-50
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• 2013

As having analyzed an advance research that had looked into how characteristics of information system affect use and success of the concerned system, the study determined that system quality, information quality and service quality are the fundamental requirements for a good accounting information system. In addition, based on perceived usefulness and perceived ease of use that have been selected as major variables related to information system acceptance proposed by Davis[10], the study conducted an empirical analysis on how such factors would influence performance of the accounting information system. According to the results from the analysis, the system quality one of the characteristics of the accounting information system was observed to have a significant influence on the perceived ease of use while both the information quality and the service quality would positively affect the perceived usefulness. Not only that, the perceived ease of use and the perceived usefulness were confirmed to be a significant factor to the performance, and with those results, all the theses of the study have been selected. As proved even with the information system success model, the system quality, the information quality and the service quality are definitely the most necessary elements for business management, and it also turned out that those elements would play an important role in several stages of the information system.