• Proceedings of the KIEE Conference
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• 1998.07a
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• pp.205-208
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• 1998

영구자석형 하이브리드 스텝모터는 저가이며 개루프 제어 장치와 더불어 기계적인 제어시스템분야에서 광범위하게 이용되어 왔다. 서보모터 기술의 발달에 따라 영구자석형 스템모터는 고토크, 정밀제어의 응용분야에 있어 중요한 위치를 계속 점유하고 있다. 스텝모터는 외란으로서 작용하는 부하의 영향에 대해 안정한 견고성을 가지며, 적당한 속도와 양호한 분해능의 조합으로 신뢰도가 높고, 구조상 단순한 특징을 갖고 있다. 최근 저가의 개루프 위치제어 장치에 2상 스텝모터와 5상 스텝모터 중에서 어느 것이 더 적합한가에 대한 기술적인 주제가 주목할 어느 것이 더 적합한가에 대한 기술적인 주제가 주목할 만한 문제로 대두되고 있다. 이 두 기기의 구조는 거의 유사하며 같은 원리로 동작한다. 본 논문에서는 이 두 기기의 동작이 명백히 비교될 수 있는 기본적인 수준으로 돌아가서 두 모델을 고찰했다.

• Annual Conference of KIPS
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• 2013.05a
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• pp.121-122
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• 2013

스마트폰 시장의 급격한 성장으로 기업 업무들이 모바일 환경으로 이전되는 추세와 함께 다양한 모바일 운영체제들의 등장으로 개발 환경의 파편화가 발생하였고 이는 응용 프로그램의 개발 및 유지 보수를 저해하는 요소로 작용하였다. 이러한 문제를 해결하기 위한 모바일 환경의 크로스 플랫폼 기술로 하이브리드 앱이라는 방법론이 제시되었다. 하지만 하이브리드 앱이 가지고 있는 성능적 제약과 기능적 제약으로 시장에서의 주력 기술로 사용되지 못하고 있다. 이러한 단점들을 극복하기 위해 네이티브 환경의 장점을 활용할 수 있도록 하는 범용실행엔진, 자동변환 저작엔진 등의 시도들이 있다. 이 논문에서는 해당 문제를 또 다른 방법으로 접근한 개방형 모바일 클라우드 플랫폼을 소개한다. 모바일 클라우드 환경을 구성하여 모바일 사용자들에게 단말의 하드웨어나 운영체제와는 무관하게 다양한 모바일 환경을 제공할 수 있고 기존 모바일 환경에 비해 고성능의 컴퓨팅을 제공할 수 있게 하는 동작 메커니즘과 기술 특징을 설명한다.

• Journal of Korean Library and Information Science Society
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• v.32 no.3
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• pp.353-395
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• 2001

Academic libraries presently are confronting the issues of organizational viability and relevance. Academic libraries are not the sole owners of the information gateway. The purpose of this study is modeling of university library's information service for effective implication of its role in order to ensure organizational viability and relevance in internet environment. New information service model of university library needs to be design according to four Principles. Firstly, building of web based library petals. Secondly, provision of web front-end with hybrid functions. Thirdly, provision of information literacy program Fourthly, extension resource sharing.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.42 no.6 s.336
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• pp.17-22
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• 2005

Organic-inorganic hybrid type thin films are the next generation candidates as low-k materials. SiOC films are analyzed the bonding structure by the red and blue chemical shift using the fourier transform infraredspectra. Conventional chemical shift of organic chemistry is a red shift, but hybrid type SiOC films were observed the red and blue shift. The chemical shift originates from the interaction between the C-H bond and high electronegative atoms, and the blue shift in SiOC films is caused by the porosity due to the increase of the electron rich group such as much methyl radicals. The bonding structures of SiOC films are also divided into the Si-O-C cross-link structure and the Si-O-C cage-link structure due to the chemical shifts. The Si-O-C cross-link structure progressed the adhesion attributed to the C-H bond elongation in the reason of the red shift, and the dielectric constant also decreases.

• Composites Research
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• v.26 no.1
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• pp.66-71
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• 2013

As a fundamental structural element of construction, a pile is constructed to transfer loads from superstructure to foundation. In general, since the pile foundation is constructed in the ground or ground under water, it is difficult to protect from the damages due to moisture and/or salt which create corrosive environment and it is even more difficult to estimate its durability. In this study, in order to enhance the durability and constructibility of the pile foundation, FRP-concrete hybrid composite pile (HCFFT) is suggested. Moreover, equation for the prediction of load carrying capacity of HCFFT circular members under compression is suggested and discussed based on the results of analytical and experimental investigations. In addition, we also conducted the finite element simulation for the structural behavior of new HCFFT composite pile and the result is compared with those of experimental and analytical studies. In addition, the axial loading capacity of new HCFFT composite pile is compared with those of existing PHC pile and hollow circular steel pipe pile, and it was found that the new HCFFT composite pile has advantages over conventional PHC and steel pipe piles.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.40 no.10
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• pp.901-906
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• 2016

The purpose of this study is to improve productivity by implementing one-pass full penetration welding using laser-arc hybrid welding for AH36. On increasing the thickness of the plate, a higher power of laser and arc was required to obtain full penetration. However, increasing the power of heat source caused undercut defects at both ends of the bead. This undercut was prevented by controlling the parameters of welding voltage and pulse correction. Hardness measurement and tensile test were conducted to apprehend the mechanical properties of weld. Also, by carrying out the microstructure observation for laser and arc regions, microstructural properties were understood.

• Journal of Korea Multimedia Society
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• v.11 no.1
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• pp.117-128
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• 2008

Recently, as the increase in interaction between the person and the person, the people plentifully use the business card to exchange personal information. So, the people have many business cards. Thus, the people are liable to lose the business cards and finding a wanted business card is very difficult in the huge business cards in offline. And, the people think the business card is a way, which can express individuality. So, the people want to have the business card, which has individuality. Thus, this paper proposes the card system, which is satisfied to solve many problems of the card system in offline and express individuality. The proposed business card system can produce various business cards and puts contents such as video, photo, voice into business cards via mobile devices in anywhere, anytime. Also, this business card system follows the vCard format, which is a file format standard for personal data interchange. Finally, we provide with content-based business card retrieval using video and photo inserted into business cards. Thus, this paper proposes the hybrid business card system, which is satisfied to produce business cards expressed individuality and follows the vCard format.

• Applied Chemistry for Engineering
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• v.32 no.4
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• pp.467-471
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• 2021

A ladder-like polysilsesquioxane (LPMA64) functionalized with a crosslinkable group was synthesized and used for the preparation of organic-inorganic hybrid gel polymer electrolytes through a thermal crosslinking process of the liquid electrolytes. A small weight percent of LPMA64 polymer crosslinker (5 wt%) was able to form a well-developed network structure, resulting in good dimensional stability with high ionic conductivity. The lithium-sulfur batteries fabricated with organic-inorganic hybrid gel polymer electrolytes exhibited stable C-rate and cycling performance with excellent Coulombic efficiency due to the alleviated lithium polysulfide shuttling effect during prolonged cycling. The result demonstrates that the organic-inorganic hybrid gel polymer electrolytes could be a promising candidate electrolyte for application in lithium-sulfur batteries.

• Archives of design research
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• v.18 no.4 s.62
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• pp.185-194
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• 2005

In the perspective of hybrid, design contains confused forms and styles. Thus, the question is what 'decisively affects' on life, happiness and peace of human beings: In the past scientific ecology that tries to solve the problem in the aspect of functional design was important. Now the question is beyond the scientific ecology because human has a different way of environmental adaptation from animals. From this point of view, design is defined as something beyond materialistic standard. Terry Eagleton said, 'Creative ability deviating oneself and transcending is the very standard to measure human beings' A tendency to hybridize one's own section off genre or pursuing dismantlement is found on such creative perspective. In other words, it focuses on making a space of human's cultural behavior by unifying creatively natural environment and architecture space in the organic aspect. Such phenomenon provides a new chance and possibility in environmental design through a new molding experiment according to the development of digital technology. As experiments of environment design using digital technology are actively implemented, ecological and cultural views hybridize to create a new cultural space of various functions and features. Such experiment in environment design highlights the connections of ecological view, recognition of value, and relation-centered ideas, and enables a tool pursuing a new cultural development. This study focuses on the paradigm of such digital hybrid design and purposes to set the system by analyzing the application styles and principles of environment design through theoretical and case studies. In addition, it promotes a new possibility to develop environment design in the history of civilization.

• Journal of the Korean Geotechnical Society
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• v.26 no.7
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• pp.117-133
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• 2010

A hybrid system of soil-nailing and compression anchor is proposed in this paper; the system is composed of an anchor bar (installed at the tip) with two PC strands and a steel bar. After drilling a hole, installing proposed hybrid systems, and filling the hole with grouting material, prestress is applied to the anchor bar to restrict the deformation at the head and/or to prevent shallow slope failures. However, since the elongation rate of PC strand is much larger than that of steel bar, yield at the steel bar will occur much earlier than at the PC strand. It means that the yield load of the hybrid system will be overestimated if we simply add yield loads of the two - anchor bar and PC strands. It might be needed to try to match the yielding time of the two materials by applying the prestress to the anchor bar. It means that the main purpose of applying prestress to the anchor bar should be two-fold: to restrict the deformation at the nail head; and more importantly, to maximize the design load of the hybrid system by utilizing load transfer mechanism that transfers the prestress applied at the tip to the head through anchor bar. In order to study the load transfer mechanism in a systematic way, in-situ pullout tests were performed with the following conditions: soil-nailing only; hybrid system with the variation of prestress stresses from 0 kN to 196 kN. It was found that the prestress applied to the anchor system will induce the compressive stress to the steel bar; it will result in decrease in the slope of load-displacement curve of the steel bar. Then, the elongation at which the steel bar will reach yield stress might become similar to that of PC strands. By taking advantage of prestress to match elongations at yield, the pullout design load of the hybrid system can be increased up to twice that of the soil-nailing system.