• Proceedings of the Korean Society for Information Management Conference
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• 1998.08a
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• pp.61-64
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• 1998

인터넷은 단순한 하나의 테크놀로지가 아닌 생활의 전 분야에 걸쳐 새로운 패러다임을 창출하고 있다. 전 세계로 연결된 인터넷은 정보 전달의 통신수단으로 대체되고 있으며, 최근 푸시기술을 응용한 새로운 형식의 소프트웨어가 솔루션으로 각광받고 있다. 본 연구에서는 이론적인 배경으로 푸시기술의 전반적인 개념 및 응용을 살펴보았고, 실제적으로 어떻게 응용되고 있는지, 특히 가상서점에서의 응용 사례를 들어보면서 앞으로 이 기술이 어떻게 발전해 가야 할지 도서관에서의 활용 방안을 모색해 보았다.

• The Journal of Information Systems
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• v.6 no.1
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• pp.27-45
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• 1997

멀티미디어를 사용하는 인간의 측면에서 기술에 대한 이해부족, 고객들의 혼란, 컴 퓨터 산업의 멀티미디어에 대한 잘못된 이해는 멀티미디어 미래를 깊이 생각하게 하고 조사 하게 된다. 멀티미디어 기술이 누구를 위한 것인가라는 질문 없이 무엇을 할 수 있는가라고 묻는 것은 적절한 질문이 아니다. 본 논문은 미디어기술 채택에 관한 과거의 경향에 초점을 맞춰 인간에게 적합한 기술이 어떻게 개발되고 인간의 선택이 어떻게 이루어지는지 조사한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.4C
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• pp.329-337
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• 2012

Capsule Endoscope(CE) is a capsule-shaped electronic device which can examine the lesions in digestive tract of human body. Recently the medical procedure using capsule endoscope is receiving great attention to both doctors and patients, since the conventional push-typed endoscope using cables brings great pain and fear to the patients. The technique was firstly available in 2000 and is based on a convergence techniques among BT(Bio Technology), IT(Information Technology), and NT(Nano Technology). The device consists of an optical parts including LEDs(Light Emitting Diodes), an image sensor, a communication module and a power module. Capsule endoscope is the embodiment of the state-of-the art technology and requires key technologies in the various engineering fields. Therefore, in this paper, we introduce the composition of the capsule endoscope system, and compare the communication method between RF(Radio Frequency) communication and HBC(Human Body Communication), which are typically used for data transmission in the capsule endoscope. Furthermore, we analyze the specification of commercialized capsule endoscopes and present the future developments and technical challenges.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.9
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• pp.454-463
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• 2017

Advancement of science and technology have led to development of the media, which has evolved election campaign strategies. Nowadays, media development has made communication more important, and it is a growing trend where smart-device applications are widely used to facilitate communication with electors. Based on Google's Fire base Cloud Messaging (FCM) push service, which keeps up with the fast-changing election trends and supports election campaigns systematically, this research aims to help accomplish the goals of an election campaign by developing an information system and performing empirical analysis of the variables that the information system affects. The system consists of an elector's application and a management system. The management system includes browsing and management of received-and sent-message history, and direct management of the application. By managing the push system in more progressive ways, this system will help to improve the effectiveness of election campaigns and accomplish election goals.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.8
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• pp.5051-5059
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• 2015

Structural behaviour of the front loader for an agricultural tractor was analyzed for three impact test conditions: drop and catch, corner pull, and corner push. Rigid-body dynamic, transient structural, and static structural analyses were conducted using a commercial finite element software. Analysis of the drop and catch test dealt with the case that the bucket located at the maximum elevation was dropped and catched through three steps. Analysis of the corner pull test dealt with the case that the bucket constrained to the ground by a chain at its corner was raised suddenly. Analysis of the corner push test dealt with the case that the corner of the bucket collided with an obstacle. Results of analyses of the three test conditions showed that maximum stress occurs at the geometrically discontinuous location in the mount and is caused from local stress concentration. Results of the present research can be utilized as a guideline to achieve more reliable and safe structural design of the front loaders.

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

• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.1A
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• pp.91-97
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• 2006

This paper presents the results of push-out test conducted for the perfobond rib shear connectors welded onto steel-concrete composite deck. Push-out test specimen consists of profiled steel sheeting, perfobond rib, reinforcement, and concrete. To provide longitudinal shear resistance between the profiled sheeting and the concrete, perfobond rib with a number of holes was used. The parameters considered in the design of perfobond rib were the spacing and location of holes, and effect of reinforcing bars placed in the holes. To validate the effectiveness of the proposed system, twelve specimens were fabricated and tested. Although the scope of test was limited in nature, the results of test have shown that the perfobond ribs can be effectively used for shear connection in the steel-concrete composite decks.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10c
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• pp.91-93
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• 2004

인터넷의 정보가 많아짐에 따라 인터넷에서 원하는 정보를 얻어 효과적으로 사용하기는 더욱 힘들어지고 있다. 그러므로 관련된 정보에 쉽게 접근하기 위해 얻고자 하는 정보를 인터넷에서 자동적으로 전달해 주는 푸쉬 기술은 중요한 인터넷 기술로 주목받고 있다. 하지만 푸쉬 기술은 정보 전달 방식으로 인해 네트웍 대역폭을 너무 많이 소요하기 때문에 푸쉬 서버의 가용성이 급격히 떨어질 수 있다는 단점을 가지고 있다. 따라서 본 논문에서는 메시지 폭주로 인한 시스템 고장에 대처하고 부하를 분산시킬 수 있는 복제에 기반한 푸쉬 서버를 설계하고, Erlang/OTP로 구현하였다. 성능을 분석하기 위하여 단일 푸쉬 서버론 사용한 결과와 본 논문에서 제안된 구조를 사용한 결과론 비교.분석하였다.

• Proceedings of the KIPE Conference
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• 2013.11a
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• pp.29-30
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• 2013

본 논문에서는 수중통신용 Parametric Array Transducer를 구동하기 위한 고효율 전력증폭기를 제안한다. 수중전력증폭기는 증폭부와 전원부로 나뉘며 증폭부는 Class B push-pull type의 전력증폭기를 사용하며 전력증폭기 구동을 위한 전원부는 기존의 일정전압이 아닌 가변전압을 얻는 Phase-shifted PWM AC/DC 컨버터를 사용하여 고효율로 동작한다. 증폭부는 Class B push-pull type 증폭기를 사용함으로써 뛰어난 선형성이 보장되며 전원 또한 ET(Envelope Tracking)기술을 적용한 가변전압 AC/DC컨버터를 사용하여 고효율로 동작한다. 본 논문에서는 고 효율 수중전력증폭기와 가변전압 AC/DC컨버터의 전력회로를 제시하고 시뮬레이션과 실험을 통하여 특성을 확인하였으며, 수중음향센서를 위한 전력증폭기로 유용하게 사용 될 것을 예상한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.24 no.7A
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• pp.955-963
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• 1999

In this paper, in other to analyze the performance of efficient key distribution protocol, we evaluate the key distribution processing method of push model like the Kerberos and pull model such as X.9.17 used in wired network. Also, we evaluate the procedure of key distribution protocol in satellite network. Besides, we analyze the performance of key distribution protocol procedure in view of delay and throughput in the case that key distribution protocol is processed based on Inband/Outband channel.