• Journal of the Korean Society of Hazard Mitigation
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• v.10 no.5
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• pp.1-7
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• 2010

Since subway fire disaster at Daegu, Korea smoke control system and passengers evacuation distance has been focused to reform. Existing smoke control facilities need to expand volume of ventilation capacity however, the complicate subway station structure can hardly react dispersion of smokes from massive subway cabin fire. Smoke flow at platform level move upward thought vertical stairway and passengers evacuation goes with same direction. The victims of evacuees from subway station fire mainly due to exposure of heat radiation and smoke. The study demonstration the effect of downward evacuates stairway system by separating evacuation route to smoke movement pass way including saving times of evacuation.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.7
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• pp.275-280
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• 2013

This paper presents an optimizing method for wireless charging system, specifically focused on the capsule endoscope applications. In order to increase the wireless power transfer efficiency of electro-magnetic resonance coupled coils, this paper investigates the impact factors of the power transfer efficiency in small battery capacity system and proposes a efficiency optimizing method based on frequency control. Simulation results show that the proposed efficiency optimal control method can effectively stabilize the wireless power transfer efficiency so as to successfully solve the main issue of transfer efficiency variation with distance and as well as parasitic element.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.05a
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• pp.230-232
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• 2011

Owing to the advent of digital devices which equipped with GPS, such as smartphone and tablet pc, a number of LBSNS applications have been released and even SNS applications serve various Location-Based Services. In twitter's case, the news of interesting area is provided to user not by being subscribed them automatically, but by being searched on web-site. This paper describes the system designed for users want to subscribe the local news without procedure like searching using operators. This system uses PBSM(Partition Based Spatial-Merge Join) which has no index for batch processing and against a massive query. The results from Spatial Join are stored in Materialized View then provided to user.

• The Transactions of the Korea Information Processing Society
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• v.3 no.5
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• pp.1229-1239
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• 1996

The increase of additional information broadcasting of TV demands a graphic overlay processor. This paper is about the design, implementation and testing of a graphic overlay processor called by KBPS decoder ASSP (Applicatio n Specific Standard Product) which is compliance with Korea Broadcast Programming System. KBPS decoder ASSP consists of embedded 8 bit microprocessor Z80, graphic overlay controller, KBPS schedule decoder, memory controller, priority interrupt controller, MIDI controller, infrared raccoon receiver, async scrial communication controller, timer, bus controller, universal parallel input-output port and serial-parallel interface. The 0.8 micron CMOS Sea of Gate is used to implement the ASSP in amount of about 31,500 gates, and it is running at 14.318MHz.

• Proceedings of the KIEE Conference
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• 2004.07d
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• pp.2685-2686
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• 2004

심자도(Magnetocardiography: MCG)는 심장에서 발생하는 자기신호로 크기가 수 pico Tesla에서 수 femto Tesla 정도로 지구 자기에 비하여 $10^{-6}{\sim}10^{-10}$ 정도로 매우 작기 때문에 보통 3층의 차폐 막 구조로 되어 있는 자기차폐실을 사용하여 외부 잡음을 줄인다. 그러나 자기차폐실의 비용이 크기 때문에, 자기차폐실의 비용을 줄이고 다양한 신호처리를 병행하여 신호대 잡음비를 높이고 있다. 본 논문에서는 1Giga FLOPS (FLoating point Operationals Per Second)의 부동 소숫점 연산능력을 가진 TMS320C6701을 사용하여 실시간 신호처리가 가능한 신호처리 시스템을 설계하였다. 개발된 DSP 보드는 PCI-bus 기반으로 설계하여 신호 측정 컴퓨터에 내장이 가능하도록 하였다. 프로그램과 데이터 처리를 위한 외부 메모리를 장착하였고, PCI 콘트롤러를 갖추어 PC 와의 대용량 메모리 공유가 가능하도록 하였다. 제작된 DSP 보드를 사용하여, 심자도 신호에서 실시간으로 적응 잡음 소거 및 필터링을 구현하여 신호대 잡음비의 향상을 확인할 수 있었다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.11 no.2
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• pp.111-116
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• 2012

In this paper, we fabricate a WiFi based video transmitting equipment and establish a video transmitting system for realtime transmitting of accident scene on expressways. The transmitting equipment is based on the H.264 video codec and embed WiFi module. The transmitting equipment can transmit video and also meta data such as location positioning through the Wibro network using a Wibro terminal. From test results, it is clear that high density videos were transmitted while the vehicle carried by the video equipment was traveling with velocity of 80 km/h.

• Solar Energy
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• v.17 no.3
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• pp.59-66
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• 1997

The present study adopted the PTV method for the velocity acquisition. The system consists of an image grabber built-in a personal computer and a laser-based sheet light projector and particle identification softwares. Velocity vectors are obtained, by PTV and they are used as velocity components for Poisson equation for pressure. Related boundary conditions and no-slip condition at solid wall and the linear velocity extrapolation on the upper side of cavity are well examined for the present study. For calculation of pressure, resolution of grid is basically $40{\times}40$ and 2-dimensional uniform mesh using MAC staggered grid is adopted. The result of experiment reveal that, newly suggested measuring method is capable of estimating pressure and velocity distribution of flow field reasonably.

• Journal of the Korea Society of Computer and Information
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• v.16 no.10
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• pp.131-136
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• 2011

In this paper, we fabricate multi channel receiver for radar system. This receiver at X-band can be received 8 signal of an identical characteristic, dynamic range has more than 80[dB]. To process direct received signals, this system has the built-in two digital de-modulators which offer the minimum loss on the receiving signal path and has high stability by adding Built-In Test. The gain, noise figure, difference of amplitude and phase on the signal path is respectively 20${\pm}$2[dB], 19[dB], ${\pm}$2[dB], $10^{\circ}$ and below.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.950-953
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• 2013

본 논문은 헬스케어 서비스에 대한 소비자 인식의 변화에 따라 최근 대두되고 있는 웰니스 서비스에 관한 연구이다. 현재 많은 소비자들이 여러 가지의 홈 헬스케어 개인건강기기를 통해 자신의 건강을 관리하고 있지만 제조사 별 고유의 소프트웨어와 통신 프로토콜을 내장되어있어 개인건강기기마다 각기 다른 방식의 서비스가 제공되고 있다. 이처럼 현재 제공되고 있는 헬스케어 서비스를 보다 효율적으로 제공하기 위해서는 다양한 개인건강기기와 서비스 제공 시스템간의 표준화된 인터페이스를 지원하기 위해서는 통합 게이트웨이 솔루션이 필요하다. 특히, 각 시스템 구성요소 간에 IEEE11073 PHD(Pelsonal Health Devices), HL7(Health Level Seven) 등의 표준을 통하여 건강정보 데이터 센싱, 취합 및 전송, 분석 및 피드백이 표준적인 방법으로 운용되어야한다. 이에 본 논문에서는 스마트 TV 환경에서 ISO/IEEE11073 표준을 준용하여 다양한 통신 인터페이스를 통한 개인건강기기의 연결성을 지원하는 통합 게이트웨이 솔루션 및 헬스케어, 건강관리와 관련된 서비스를 위한 건강정보 모니터링 앱을 설계하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.5 no.3
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• pp.236-240
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• 2004

We have implemented image monitoring system on PXA255 processor based embedded board that is ported QT/Embedded 2.3.7 version. User is able to monitor camera's capture image for widely separated host PC at client PXA255 board target board by ethernet communication method. And we designed PCI interface card that control motor for camera's Pan & Tilt. Bitmap format's images of $320\times{240}$ size are displayed on PXA255 board's TFT-LCD and User is able to monitor wanted position's image by touch screen input method.