• The Korean Journal of Pain
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• 제12권2호
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• pp.195-199
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• 1999

Background: At present, there is no reliable objective test for the diagnosis of myofascial trigger points (MFTP). We evaluated the usefulness of skin resistance point finder for the diagnosis of MFTP. Methods: 40 subjects with clinical MFTPs at the upper trapezius muscle were included in this study. Using skin resistance point finder (UNIQUE S-2010$^{(R)}$, Seik medical, Korea), we tried to find out the point of low skin resistance. At three different current level, sensitivity and specificity of this method for the diagnosis of clinically identified MFTP was evaluated. Pressure threshold for pain of low skin resistance point was measured using Pressure Threshold Meter$^{(R)}$ (Pain Diagnostics and Thermography, U.S.A.). 3 groups of point detected at different current were compared in mean pressure threshold. Results: Fixed single current of skin resistance point finder showed variable sensitivity and specificity. But, by adjusting current level, skin resistance point finder detected all of 40 clinically identified MFTPs. Although it is partially statistically significant, the mean pressure threshold of points detected at high current was high. Conclusion: Skin resistance finder can be used as objective diagnostic tool of MFTPs. There is possibility that it can be useful in evaluating treatment effect. However, more investigation is necessary.

• 한국융합학회논문지
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• 제7권4호
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• pp.25-32
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• 2016

본 논문에서는 무선 기지국에서 멀티캐스트 패킷 재전송을 담당하는 Agent를 설치하여 신뢰성있는 멀티 캐스트 프로토콜인 MFTP에서의 재전송률을 낮추고자 한다. 유무선 통합 환경에서 신뢰성 있는 멀티캐스트 프로토콜 사용 시, 무선 링크의 비트 에러와 단말의 이동성을 보장하기 위한 핸드오프로 오류가 많이 발생한다. 이런 오류때문에 멀티캐스트 그룹에 제어 및 재전송 패킷이 증가하게 되며, 또한 멀티캐스트 그룹 세션 전체 성능이 저하된다. 본 논문은 기지국에 무선 환경에 있는 단말의 복구 요구 패킷에 대한 복구 패킷 전송을 담당하는 Agent을 도입하는 방식을 제안하고 있다. MATLAB를 이용하여 제안한 방법이 멀티캐스트 세션에 복구 요구 및 복구 패킷의 수을 줄일 수 있고 멀티캐스트 그룹 세션 전체의 성능을 향상시킬 수 있음을 검증하였다.

• 센서학회지
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• 제26권6호
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• pp.408-413
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• 2017

In this paper, we newly developed a byte-inverted transmission method for flicker-free visible light communication (VLC). The VLC transmitter sends original data in the former half period of the clock, and inverted data and in the latter half period of the clock. The VLC receiver receives the original data in the in the former half period of the clock. In this system, we used 480Hz clock that was generated from the 60Hz power line. The average optical power of the LED array in the transmitter is constant, thus flicker-free, in the observation time longer than the period of the clock that is about 2ms. This period is shorter than the maximum flickering time period (MFTP) of 5ms that is generally considered to be safe. This configuration is very useful in constructing indoor wireless sensor networks using LED light because it is flicker-free and does not require additional transmission channel for clock transmission.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 통신소사이어티 추계학술대회논문집
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• pp.145-148
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• 2003

A lot of institutes have proposed RMT (Reliable Multicast Transport) techniques over IP multicast environment which provides only best-effort services. The ECTP (Enhanced Communications Transport Protocol) is a kind of RMT technique and an international standard of ITU-T and JTC1/SC6. It is a protocol that provides reliability fer IP multicast environment. In this paper, we tested ECTP applications which are MFTP (Multicast file transport protocol) and WB (white Board) on the APAN (Asia-Pacific Advanced Network) with the Kyushu University in Japan. We measured ECTP traffic using a packet capture tool that programmed by Pcap library that is developed in Lawrence Berkeley institute. In according to the result, we think that ECTP is an efficient protocol in transporting files to many receivers simultaneously.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2003년도 추계종합학술대회
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• pp.916-919
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• 2003

신뢰적으로 멀티캐스트 데이터를 전달하는 메커니즘을 설계하기 위해선 1:1 유니캐스트 환경과는 달리 고려되어야 할 주요한 사항들이 있다. ECTP-1은 IP멀티캐스트 데이터 전송과정에 신뢰성을 제공해 주는 트랜스포트 계층의 프로토콜로써, 계층적 제어 트리를 구성하여 신뢰적 데이터를 전송한다. ECTP-1은 현재 리눅스 환경에서 구현되었으며, mftp(multicast ftp) whiteboard 응용 프로그램을 사용하여, APAN 망 환경에서 성능을 검증하였다.