• Annual Conference of KIPS
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• 2013.11a
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• pp.1592-1595
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• 2013

최근 모바일 기기의 급속한 발전 및 보급으로 화상회의 그리고 Google의 Hangouts나 Apple의 FaceTime과 같은 화상 통신의 사용이 증가하고 있다. 그러나 기존의 화상통신 시스템은 사용자 PC나 모바일 단말기의 플랫폼 환경에 맞는 애플리케이션이나 플러그인을 설치해야 하는 단점이 있다. 따라서 본 논문에서는 WebRTC를 사용한 클라우드 기반의 다자간 화상 통신 시스템을 제안한다. 제시된 시스템은 PC나 모바일 단말기에 제약 받지 않고 HTML5를 지원하는 웹 브라우저 만을 이용하여 화상 통신을 제공하며, 화상 통신 서비스 제공자가 별도의 서버 환경을 구축할 필요가 없는 클라우드 기반의 서비스이다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.10a
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• pp.161-164
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• 2012

Location-Based Services(LBS) are a general class of computer program-level services used to include specific controls for location data as control features in computer programs. In recent years, the number of smart device(Smart Phone, Tablet PC etc.) users growth was exponential. For that reason, using rate of LBS has drastically increased. The most important thing of LBS is security. Personal information, especially private information likes illness, should not be disclosed. In this paper shows how to attack LBS and how to defense it.

• 한국정보교육학회:학술대회논문집
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• 2009.08a
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• pp.189-194
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• 2009

디지털교과서 시범사업은 미래교육의 시발점으로서 다양한 장점 및 교육적 효과를 제공할 수 있다. 한편 디지털교과서 환경에서는 현실세계와 유사한 태블릿 PC 기반의 펜 스케치를 메타포로 사용하고 있으며, 디지털 잉크 기반의 이러닝은 다양한 교육적 장점을 제공할 수 있다. 그러나 현재 보급되고 있는 디지털교과서 콘텐츠는 펜 기반의 메타포를 고려하지 않은 서책형 교과서의 멀티미디어 버전 형태이며 그 결과 태블릿 PC의 본연의 기능을 충분히 활용하지 못하고 있다. 따라서 본 연구에서는 학습자가 자기주도적으로 전자 펜 기반 스케치 입력방식을 통해 문제를 해결하고 학습의 결과물을 직접 확인할 수 있는 스케치 기반의 인터페이스를 설계 및 적용하여 교수자와 학습자간의 활발한 상호작용을 제공하고자 한다. 본 연구의 결과는 온라인 교육이나 전자 책, 지능형 교육 시스템 등 상호작용이 가능한 교육용 콘텐츠 개발에 확대 적용될 수 있을 것으로 기대한다.

• Annual Conference of KIPS
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• 2011.11a
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• pp.306-309
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• 2011

컴퓨터의 발전과 함께 음악 프로그램을 이용한 작곡 작업은 전문가부터 일반인에게 이르기까지 사용자의 폭을 넓혀왔다. 본 연구에서는 이러한 작곡 작업을 보다 효과적으로 하기 위하여 다양한 방안을 모색하였다. 단순한 텍스트 기반의 음악 검색이 아닌 미디(Midi) 분석엔진 기반의 다양한 검색방법을 설계하였으며 이를 기반으로 통합 음악제작/검색 솔루션을 구현하였다. 또한, 휴대성(Portability)을 위하여 MS 사의 WindowsPhone7 플랫폼 기반의 어플리케이션 구현을 통해 PC기반의 프로그램을 모바일 환경에서 작동 및 사용할 수 있도록 구현하였다.

• Journal of Institute of Control, Robotics and Systems
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• v.9 no.10
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• pp.768-773
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• 2003

Injection molding has been widely used for the mass production of a plastic product. With the development of the relative technique, various injection molding techniques have been developed and we could get more precise plastic product. The temperature of a melting resin is an important factor in the injection molding and this temperature has direct influence on the quality of a plastic product. In the present injection molding machine, the deriation of a temperature controlled by PID control method is within 2$^{\circ}C$ in the injection molding machine but PID control method takes too much time to stabilize after preheating and its overshoot is so big. We applied fuzzy control to alleriate the problem. In this research, we experimented the fuzzy temperature control with the usage of PC based PLC.

• Journal of the Korean Society for Precision Engineering
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• v.18 no.7
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• pp.65-71
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• 2001

The development process of the polishing system for the aspherical lens mold for opto-electronics industry is described. The system uses the method that polishing tool is scanned on the surface under PC-NC control for the aspherical lens mold. The two axes interpolation of the minimum translation mechanism is applied to give uniform working condition by motion analysis. An aspherical surface is divided into multiple sections and each dwell time is calculated from the polishing rate model based on the Preston equation. As result of form error compensation experiment, initial form error is decreased about 25% while an average value of surface roughness is also reduced successfully from 180nm to 19nm.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.7
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• pp.85-93
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• 1999

In this study, PC-based slicing machine and driving software were constructed for the purpose of automation of semi-conductor cutting process. The biggest feature of software is variation of parameter and include data base, signal monitoring, error report, corresponding action or automatic motion planing. Parameters were drawn and algorithms were developed to make software by GUI interface. The cutting experiment was done for sampled wafer to see the effectiveness of the soft automation. From the experimented and implemented results, it is shown that parameters for automation of slicing process could be drawn, then its algorithms constructed. It could be considered what is the merit of this slicing machine by comparing the PC-based and the NC-based.

• Journal of Korea Game Society
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• v.9 no.1
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• pp.85-91
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• 2009

In the recent development of 3D game, the importance of the game interface as well as the amusement and performance of the game is highlighted. Considering the fact that the flash can easily express the various multimedia contents will provide new possibilities and improve the presentation of game interfaces, the system using the flash in 3D PC game interface was designed and tested in this paper.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.8C
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• pp.771-781
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• 2002

Conventional command-based communication services are rapidly substituted by multimedia web-based communication services at most recent times. As the result, many valuable database and services developed by investing lots of human and material resources become to be useless. Therefore in this paper we researched the implementation methods and techniques for making the updates efficiently from the conventional command-based database services to a multimedia web-based database system that made users easily access to database and services.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.52 no.3
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• pp.116-123
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• 2003

This paper deals with an experimental study for on-line monitoring the performance of a universal motor for vacuum cleaner. Performance tests are conducted on the PC-based virtual instrumentation system designed using the graphical programming language LabVIEW. The proposed monitoring system is capable of performing real time measurement functions, including data acquisition, display, and analyses in the time and frequency domains, as well as data archiving. The measured mechanical and iron loss, voltage, current, input power, power factor, torque, and efficiency characteristics are presented as function of speed.