경락(經絡)의 기화체계(氣化體系)에 대한 연구(硏究)

손창수 ( Chang Su Son ),김윤태 ( Yon Tae Kim ),김길훤 ( Gil Whon Kim ),신흥묵 ( Heung Mook Shin ) 대한경락경혈학회 2004 Korean Journal of Acupuncture Vol.21 No.1

Objectives and methods: This research aims to study about conversion system of channels. In the present study, we investigated the movement and conversion of channels on the base of three step theory(三才論), Yeak(易), Hado.Laksea(河圖洛書) and five elements motion and six kinds of factors(Six-Qi). Results and Conclusions: The organization of meridian is composed of the following three parts: hand and foot, Yin and Yang, and the viscera and bowals. It is play an important role in energy flow and its conversion. The law governing energy conversion is divided into three groups i.e. taiyin-yangming channel, shaoyin-taiyang channel and jueyin-shaoyang channel group. Those are composed of Deadea(對待) of Six-Qi, making the body homeostasis. Taken together, we suggest that the conversion system of meridian is founded on the unity between the human body and nature which provides the medical workers with a necessary method of thinking in treating diseases.

경락(經絡)의 기화체계(氣化體系)에 대한 연구(硏究)

손창수,김윤태,김길훤,신흥묵,Son, Chang-Su,Kim, Yon-Tae,Kim, Gil-Whon,Shin, Heung-Mook 경락경혈학회 2004 대한침구의학회지 Vol.21 No.1

Objectives and methods : This research aims to study about conversion system of channels. In the present study, we investigated the movement and conversion of channels on the base of three step theory(三才論), Yeak(易), Hado.Laksea(河圖洛書) and five elements motion and six kinds of factors(Six-Qi). Results and Conclusions : The organization of meridian is composed of the following three parts: hand and foot, Yin and Yang, and the viscera and bowals. It is play an important role in energy flow and its conversion. The law governing energy conversion is divided into three groups i.e. taiyin-yangming channel, shaoyin-taiyang channel and jueyin-shaoyang channel group. Those are composed of Deadea(對待) of Six-Qi, making the body homeostasis. Taken together, we suggest that the conversion system of meridian is founded on the unity between the human body and nature which provides the medical workers with a necessary method of thinking in treating diseases.

임펄스 응답 신호를 이용한 인체 채널 분석

강태욱,이재진,오왕록 한국전기전자학회 2022 전기전자학회논문지 Vol.26 No.1

This study presents an analysis of the human body channel as an electric signal path using body impulseresponse (BIR). The human body communications (HBC) has recently emerged as an effective signal transmissionmethod to create wireless body area networks (WBAN). We provide body channel characteristics based onmeasured BIR in a proper experimental environment for the HBC using capacitive coupling with a customizedchannel sounding device, which can be applied as a guideline for the HBC system design. The frequency responseof the BIR, extracted by a customized signal processing for the measure signals, shows the channel path loss (CPS)between 0 MHz and 100 MHz with an average CPS of approximately 46.8 dB. In addition, the relative noise powerdistributions can provide estimations on the signal to noise ratio at the HBC receiver in terms of capacitor andresistor values in the measured frequency band and the frequency band lower than 3 MHz considering thebaseband signal detection. 본 연구에서는 전기 신호 경로로서의 인체 채널에 대해 임펄스 응답 신호를 이용한 분석 결과를 제시한다. 최근, 인체 통신(human body communications)은 착용형 또는 임플란트형 센서 디바이스 간의 통신 방법으로 인체 영역 통신망(wireless bodyarea networks)을 구성하는 효과적인 접근방법으로 제시되고 있다. 인체 통신 시스템 설계에 중요한 지침인 인체 채널 특성 제공을위해, 자체 제작한 채널 응답측정장치를 사용하고 용량성 커플링(capacitive coupling) 특성에 적합한 실험환경을 구축하여 측정을수행하고 그 분석한 결과를 제시한다. 측정 신호에 대한 신호처리 과정으로 임펄스 응답을 효과적으로 추출하여, 0 MHz에서 100MHz 사이의 주파수 분석을 통해 평균 경로 손실 약 46.8 dB를 제시하고 주파수별 경로 손실 특성을 확인할 수 있다. 또한, 본 연구는 인체 통신 시스템의 수신기 신호 대 잡음비(signal-to-noise ratio) 예측을 위한 수신기 필터의 커패시터와 저항값 변화에 따른전체 측정 주파수와 기저 대역 신호의 검출 성능 결정에 영향을 주는 3 MHz 이하 대역에서의 상대적인 잡음 전력을 제시하였다.

Analsysis on Co-channel Interference of Human Body Communication Supporting IEEE 802.15.6 BAN Standard

황정환,강태욱,김윤태,박성욱 한국전자통신연구원 2015 ETRI Journal Vol.37 No.3

Human body communication (HBC) is being recognized as a new communication technology for mobile and wearable devices in a body area network (BAN). This paper presents co-channel interference experienced by HBC supporting the physical layer in the IEEE 802.15.6 BAN standard. To analyze the co-channel interference, a co-channel interference model is introduced, and space-domain and time-domain parameters representing an interference environment are generated using the co-channel interference model. A new signal-to-interference ratio (SIR) parameter depending on the peak amplitudes of the data signals causing co-channel interference is defined; co-channel interference can be easily analyzed and modelled using the newly defined SIR. The BER degradation model derived using the co-channel interference model and SIR in this paper can be effectively used to estimate the performance.

인체 통신에 따른 인체 주변에서의 전기장 분포 계산 및 전송 손실 연구

주영준(Young-Jun Ju),김윤명(Youn-Myoung Gimm) 한국전자파학회 2012 한국전자파학회논문지 Vol.23 No.2

인체 통신이란 사람의 몸통이나 피부를 전송 매질로 하여 데이터를 송수신하는 통신 방식을 의미한다. 본 논문에서는 인체 피부 표면에 닿아 있는 자유 공간을 전송 매체로 하여 데이터를 전달하는 전송 방식에 대하여, 10~30 MHz 주파수 범위에서 5 MHz 간격으로 5개의 주파수에 대하여 송수신부 사이의 전기장 분포에 대하여 수치 해석하였다. 채널 손실 계산은 총 29종의 조직으로 구성되어 있는 한국형 남성 표준 인체 모델에 상용의 툴을 사용하여 실행하였다. 계산 주파수에 따른 인체 조직의 도전율과 비유전율을 해석 파라미터로 입력하여 송수신부로 간주되는 손등 위에서 전기장 분포를 계산하였다. 손등에 부착된 송신기에 의한 전자파比흡수율(SAR: Specific Absorbtion Rate) 값을 계산한 후, 국제비전리복사방호위원회(ICNIRP: International Commission on Non-Ionizing Radiation Protection) 인체 보호 기준과 비교하였다. 또한, 수치 해석으로 구한 전기장을 선(線)적분하여 인접한 극판들 사이의 전압들을 계산하였고, 송신부와 수신부의 전압의 비(比)를 채널 손실로 정의하였다. 수치 해석 결과, 10~30 MHz 주파수 대역에서 채널 손실의 범위는 약 (75 ± 1) dB로 주파수에 따른 채널 손실의 변화가 크지 않았다. Human body communication means transmitting and receiving data through human body medium or through free space along with the human body skin. Electric field distribution around the human body between the transmitter and the receiver were calculated at five different frequencies with 5 MHz interval between 10 MHz and 30 MHz. Commercial electromagnetic simulation tool was used for the calculation of E-field distributions applying the Korean standard male model including 29 different kinds of human tissues. After calculating specific absorption rate(SAR) values on back of the hand, it was compared with International Commission on Non-Ionizing Radiation Protection(ICNIRP) human protection guideline. While conductivities(σ) and relative permittivities(εr) of the human tissues for each frequency were input as the analyzing parameters, electric field intensities near both hands were integrated along the integral line between the nearby electrodes for the calculation of the transmitting and receiving voltages whose ratio was defined as channel loss. The calculated channel losses were about (75 ± 1) dB and showed nearly flat response all through the evaluated frequencies.

Review of capacitive coupling human body communications based on digital transmission

강태욱,오광일,박형일,강성원 한국통신학회 2016 ICT Express Vol.2 No.4

Human body communications (HBC) have been studied as an enabling technology to meet the recently increased demands for low-power and high-simplicity in wireless body area networks for wearable-device applications. Previous works on HBC focused mainly on channel modeling with a measurement method, signal transmission scheme, and transceiver implementation. In particular, the digital transmission, invented as a customized approach for the human body channel, has contributed to develope low-complexity HBC systems. This paper addresses on-going research on capacitive coupling HBC based on digital transmission by exploring recent literature.

Modeling of UWB Channel With Population Density in Indoor LOS Environments

Young-Hoon Kim,Jae-Hyun Lee,Seong-Cheol Kim IEEE 2016 IEEE antennas and wireless propagation letters Vol.15 No.-

<P>This letter deals with the effect of multiple human bodies on an ultrawideband (UWB) channel in indoor line-of-sight (LOS) environments. To assess this, we choose four environments and consider four scenarios that have a different number of people in each environment. A distance-dependent path-loss model, a frequency-dependent path-lossmodel, and time dispersion parameters are considered. We found that the distance-dependent pathloss exponent increases as population density increases, while the frequency-dependent path-loss exponent decreases. The time dispersion parameters decrease as population density increases. The results suggest that the effect of the presence of people on UWB channels should be considered when assessing the performance of UWB systems.</P>