• Proceedings of the Korea Association of Information Systems Conference
• /
• 1996.11a
• /
• pp.110-123
• /
• 1996

Misunderstanding of multimedia in the computer industry, the confusion of consumers, and the lack of understanding of technology in the human context provide an impetus for examining and speculating on the future of multimedia. "What can a multimedia technology do ?" is not a sufficient question for consumers until we add "for whom." Both how the relevant technology is likely to develop and how human choices would be made are examined with a focus on historical trend in media technology adoption.

• Proceedings of the Korea Society for Industrial Systems Conference
• /
• 1996.10a
• /
• pp.110-123
• /
• 1996

Misunderstanding of multimedia in the computer industry , the confusion of consumers, and the lack of understanding of technology in the human context provide an impetus for examining and speculating on the future of multimedia. "What can a multimedia technology do?" is not a sufficient question for consumers until we add " for whom" . Both how the relevant technology is likely to develop and how human choices would be made are examined with a focus on historical trend in media technology adoption.

• 한국정보통신설비학회:학술대회논문집
• /
• 2005.08a
• /
• pp.27-29
• /
• 2005

본 논문은 유무선 IP단말기에 다양한 컨텐츠를 제공하는 푸시 서비스 제공 솔루션을 설계하고, 이를 이용하는 네 가지 응용서비스 모델을 제시함으로써 IP-PBX/IP-Centrex와 같은 기업용 통신 솔루션[1]과 연계하여 신규 서비스를 제공할 수 있는 방안을 제시한다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.17 no.7
• /
• pp.1602-1608
• /
• 2013

PoC (Push-to-Talk over Cellular) provides one-to-one as well as one-to-many communications with VoIP technology based on SIP over cellular networks. According to above property, PoC is considered as perscrptive technology for public protection for disaster relief networks. For this networks, group communication is the essential function. However, since current standardization process takes into general scenarios account without any consideration for mentioned networks, it have some problems in the point of adaptability. To solve above problem, in this paper, we propose how to reduce the overhead on the PoC server to reduce the transmission delay. Simulation results are shown to evaluate the improved performance.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.14 no.10
• /
• pp.5290-5298
• /
• 2013

In order to apply a mechanical deck joint to the prefabricated steel grid composite decks, shear resistance of a joint composed of concrete shear key and high-tension bolt is experimentally evaluated by the push-out test. Shear resistance evaluated by the test is compared with resistance estimated by empirical and design equations based on the shear friction theory. Test results show that joint specimens bonded by epoxy have about 10% more shear resistance than specimens with strengthened shear key by steel plates, but in the case of specimens with strengthened shear key there is smaller resistance deviation than specimens bonded by epoxy. In comparison with resistances estimated by empirical and design equations, the deck joint can be safely designed. But because the existed shear resistance of deck joint is underestimated by the ACI-318, application of the LRFD design equation could be more reasonable.

• Proceedings of the KIPE Conference
• /
• 2003.07a
• /
• pp.345-351
• /
• 2003

Single winding self driven synchronous rectification(SWSDSR) scheme is based on an additional winding in the power transformer (auxiliary winding). It allows for maintaining the synchronous rectifiers on even when the voltage in the transformer is zero, which is impossible to do in traditional self-driven approaches. Its technique is verified to improve the efficiency by experiment. In this paper, there are compared self driven synchronous rectification(SDSR) with SWSDSR about the efficiency

• Proceedings of the Korea Information Processing Society Conference
• /
• 2017.04a
• /
• pp.721-724
• /
• 2017

Designing the User-Based Voluntary Service Recommendation Program proposed in this study was motivated by the fact that it is not easy for volunteers to find a place for their services. Even though there are many volunteer centers or organizations, volunteers often experience difficulty in where and how they should apply for their work as those places are not well promoted. Thus, this program has been designed by applying the mobile push services along with location technology. The authors plan to introduce the program to the public as an open source by implementing the program with both Android and Python - hoping that the program will be useful to the users and volunteer organizations.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2011.07a
• /
• pp.164-166
• /
• 2011

스마트폰은 항상 사용자가 휴대하고 있으며 필요에 따라 적절한 어플리케이션을 내려 받아 기능을 확장할 수 있다. 이에 많은 서비스 업체들은 사용자가 언제 어디서나 자사의 서비스를 이용할 수 있도록 스마트폰용 어플리케이션을 개발하고 있다. 본 고에서는 현재 스마트폰 플랫폼인 iOS, 안드로이드, MS 에서 제공한 푸시 서비스에 대해 분석한다. 다음으로 국가의 재난경보서비스를 위해 이 기술을 활용할 경우의 문제점 찾아 보았다. 본 연구의 결과 현재의 푸시 기술은 많은 문제점을 가지고 있기 때문에 정부에서 본격적으로 푸시 기술을 활용한 스마트폰 재난경보서비스를 시작하기엔 아직 이른 것으로 판단된다.

• Korean Journal of Computational Design and Engineering
• /
• v.5 no.2
• /
• pp.184-195
• /
• 2000

MDO (Multidisciplinary Design Optimization) methodology is an emerging new technology to solve a complicate structural analysis and design problem with a large number of design variables and constraints. In this paper MDO methodology is adopted through the use of computer aided systems such as Geometric Solid Modeller, Mesh Generator, CAD system and CAE system. And this paper introduces MDO methodology as a new method for structural analysis and design through the application to the structural design of flap drive system. In a MDO methodology application to the structural design of flap drive system, kinetodynamic analysis is done using a simple aerodynamic analysis model for the air flow over the flap surface instead of difficult aerodynamic analysis. Simultaneously the structural static analysis is done to obtain the optimum structural condition. And the structural buckling analysis for push pull rod is also done to confirm the optimum structural condition (optimum cross section shape of push pull rod).

• 한국지구물리탐사학회:학술대회논문집
• /
• 2003.11a
• /
• pp.122-128
• /
• 2003

Rock bolts are widely used as a supplementary roof support system in hard-rock mining since a long time. Since the performance of fully grouted passive bolts depends on bond strength, in the present investigation extensive laboratory pull-out as well as push-out tests were conducted varying the bolt diameter, length and cement-water mixing ratios of grout. The load-displacement curves were developed and were verified with the numerical results obtained from finite element analysis using ALGOR software. Numerical models were validated for push-out tests and a detailed analysis was carried out to know the displacement, stress, strain distribution along the bolt.