• Proceedings of the KIEE Conference
• /
• 2007.10c
• /
• pp.223-225
• /
• 2007

The contact-less inductive power transformer (IPT) uses principle of electromagnetic induction. Generally, there were many methods to improve the transfer performance of traditional transformer. But, though the principle of IPT is similar to that of general transformer, it is impossible to apply the methods because of large air-gap. Consequently, many linear numerical formulas for analysis of performance and design of traditional transformer cannot be used in development of IPT. The concept of the IPT for vehicle like PRT(Personal Rapid Transit) system is suggested and some suggestions for power collector(core & winding) design of IPT to improve power transfer performance arc presented in this paper. The characteristic of power delivery with these novel methods in design is presented by simulation and examination.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2003.10a
• /
• pp.78-82
• /
• 2003

The cooling mechanism for a regenerative cooling liquid rocket engine of 10tf-thrust using kerosene as a fuel was studied from the viewpoint of curtain cooling. Based on the concept of a highly-stratified gas flow in the combustion chamber, the cross section of the combustion chamber was spilt into 2 independent parts, core and exterior part. Additional fuel is injected into the exterior section and gas temperature can be reduced in the exterior section. Consequently, the heat flux into the coolant and wall temperature are reduced and the thermal stability of a liquid rocket engine could be improved.

• Journal of architectural history
• /
• v.10 no.2 s.26
• /
• pp.7-19
• /
• 2001

Ip-am valley, located at the eastern remote part of Korean peninsular was the place where a remarkable Confucian scholar Chang Hyon-gwang spent his secluded days. A large upright stone, called Ip-am, and undulating streams nearby were surrounded by mountains, which formed a large enclosed valley. After selecting 28 natural and artificial places, Chang named each of them. Chang compared the relationship between Ip-am and the 28 places with that of the Polestar and 28 Lunar Lodgings, which were known as the ancient Chinese astronomical concept. Also, Chang regarded the valley as a place where the Taoistic Deity could stay. Chang, who had deep knowledge of astronomy, wrote some books on it. It could be said that the comparison of his hermitages with the Polestar and the 28 Lunar Lodgings resulted from his deep passion for astronomy. He considered the Ip-am valley to be the core of the universe like the Polestar is the core of the celestial world. Some stars like the Polestar or the Dipper were regarded as the Deities of Taoism. We can find that Confucian scholars of the middle Choseon, like Chang Hyon-gwang, also tended to have some concern about Taoism.

• Journal of the Korean Society of Costume
• /
• v.63 no.7
• /
• pp.148-163
• /
• 2013

The purpose of this study is to examine the attributes and internal structure of fashion brand authenticity, which is a new concept of brand association. For quantitative research, a total of 591 samples of consumer survey were taken from 24th of August to 7th of September, 2009. The results of this study were as follows: 1) The scale for the fashion brand authenticity was developed, which consisted of 33 questions. These questions estimated a total of 8 dimensions, including heritage, authority, relationship to place, consistency, non-popularity, trend leading, originality, and ethics. 2) The internal structure of the fashion brand authenticity was confirmed. The internal structure was constituted into core attributes and promoted attributes. 3) The relationship between the fashion brand authenticity and consumer related variables were found. The core attributes of authenticity were putting positive influence directly on brand loyalty. However, paths through brand attachment or brand commitment were not found. The promoted attributes showed that it had a direct negative influence on brand loyalty, but it has also showed positive influence on paths, which underwent brand attachment and commitment.

• The Magazine of the IEIE
• /
• v.25 no.5
• /
• pp.31-41
• /
• 1998

With the advent of portable electronic systems, power consumption has recently become a major issue in circuit and system design. Furthermore, the sophisticated fabrication technology makes it possible to embed more functions and features in a VLSI chip, consequently calling for both higher performance and lower power to deal with the ever growing complexity of system algorithms than in the past. VLSI designers should cope with two conflicting constraints, high performance and low power, offering an optimum trade off of these constraints to meet requirements of system. Historically, VLSI designers have focused on performance improvement, and power dissipation was not a design criteria but an afterthought. This design paradigm should be changed, as power is emerging as the most critical design constraint. In VLSI design, low power design can be accomplished through many ways, for instance, process, circuit/logic design, architectural design, and etc.. In this paper, a few low power design examples, which have been used in 8 bit micro-controller core, and can be used also in 4/16/32 bit micro-controller cores, are presented in the areas of circuit, logic and architectural design. We first propose a low power guidelines for micro-controller design in SAMSUNG, and more detailed design examples are followed applying 4 specific design guidelines. The 1st example shows the power reduction through reduction of number of state clocks per instruction. The 2nd example realized the power reduction by applying RISC(Reduced Instruction Set Computer) concept. The 3rd example is to optimize the algorithm for ALU(Arithmetic Logic Unit) to lower the power consumption, Lastly, circuit cells designed for low power are described.

• Korean Journal of Social Welfare
• /
• v.68 no.1
• /
• pp.169-191
• /
• 2016

The purpose of this study was to understand social enterprise business operations experience converted from a self-sufficient enterprise. In-depth interviews with representatives of the 4 recycling social enterprises from self-sufficient enterprise which located in Chungbuk province were performed to collect data and analyzed by grounded theory method. As a result, configured 88 concepts and classified into 28 sub-categories 12 categories. According to a paradigm model, Core category, conditions, strategies and consequences were derived from the grounded theory. Especially, the core concept of enterprise management experience of the participants was 'An effort to overcome the harsh business conditions by pursuing sense of community and trying to secure its own competitiveness'. Based on the result, practical and policy proposal for management of the social enterprises were suggested.

• Journal of the Korean Society of Safety
• /
• v.31 no.6
• /
• pp.129-134
• /
• 2016

Standard design of APR+(advanced power reactor plus) was certified at 2014 by Korea regulatory body. Based on the experience gained from OPR1000 and APR1400, the APR1400 was being developed as a 1,500MWe class reactor using Korean technologies for design code, reactor coolant pump, and man-machine interface system. APR+ has been basically designed to have the seismic design basis of safe shutdown earthquake (SSE) 0.3g, a 4-train safety concept based on N+2 design philosophy, and a passive auxiliary feedwater system (PAFS). Also, safety issues on the Fukushima-type accidents have been extensively reviewed and applied to enhance APR+ safety. APR+ provides higher reliability and safety against tsunami and earthquake. The purpose of this paper is to implement probabilistic safety assessment considering these design features and to analyze sensitivity of core damage frequency for large loss of coolant accident of APR+.

• Journal of the Korean Society of Costume
• /
• v.62 no.4
• /
• pp.181-194
• /
• 2012

The purpose of this study is to examine the attributes and internal structure of fashion brand authenticity, a new concept of brand association. For qualitative research, a total of 22 samples of consumers and professional groups were selected to implement in-depth interviews and focus group interviews. The results of this study were as follows: 1) the authenticity of fashion brand included various sub-dimensions. Attributes that constituted the authenticity of fashion brand, consisted of these following 8 dimensions: heritage, authority, relationship to place, consistency, non-popularity, trend-leading, originality and sustainability. 2) sub-dimensions of the fashion brand authenticity were once again categorized into core attributes and promoted attributes. Dimensions such as heritage, authority, relationship to place, consistency and non-popularity dimensions were inherent attributes of the brand, formed at a comparatively long time. Subsequently, these were categorized as core attributes of the authenticity of fashion brand. The trend-leading, originality and sustainability can form in a relatively short period of time by accepting the change, so it was categorized as promoted attributes which were created at the front stage with the consumers.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.31 no.10
• /
• pp.66-72
• /
• 2003

The cooling mechanism for a liquid rocket engine of 10tf-thrust using kerosene as a fuel was studied from the viewpoint of both the regenerative and curtain cooling. Based on the concept of a highly-stratified gas flow in the combustion chamber, the cross section of the combustion chamber was spilt into 2 independent parts, core and exterior part. Additional fuel is injected into the exterior section and gas temperature can be reduced in the exterior section. Consequently, the heat flux into the coolant and wall temperature are reduced and the thermal stability of a liquid rocket en g i.ne could be improved.

• Journal of the Korean Society for Precision Engineering
• /
• v.22 no.7 s.172
• /
• pp.146-154
• /
• 2005

Recently, the high-speed and intelligence technology of machine tools are developed for the high efficiency of productivity Under the operating condition from the high-speed of machine tools, the various failure modes can occur in core units of manufacturing system. Therefore it is for the reliability concept of machine tool to be required in a design level. And the above-stated technology must be accommodated in the feeding and spindle subsystem, etc those are the core units of machine tools. In this study, we are developed the test-bed of sliding cover (C-plate) in order to evaluating reliability and estimating failure modes of feeding subsystem under operating conditions. The reliability experiment using the developed test-bed and the additional structural analysis executed on single and double structure. We found out the weak parts of sliding cover and were able to predict a life cycle from the experiment results. In this study, we propose the new C-plate model with double link structure to apply the high-speed machine tool in the fundamental guideline.