• Journal of Korean Institute of Industrial Engineers
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• v.11 no.2
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• pp.87-99
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• 1985

The purpose of this study is to analyze the changes in centers-of-gravity (COG), acceleration and body posture and their associated effects both on EMG and on the maximum capability of weight lifting during Clean & Jerk and Snatch motions. Displacement, velocity, acceleration of joints were obtained from film analysis. Also levels of exertions on 11 major muscle groups were obtained from EMG analysis during a lifting cycle. The EMG data were measured from Telemetry System which is useful in field experiments. Magnitude and direction of force, change in center-of-gravity were extracted from COG data which were measured from force platform. The results of this study can be to be useful both to coaches and to athletes in weight-lifting.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2017-2019
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• 2003

열악한 환경에서 동작해야 하거나 물리적 접근이 어려운 곳에 장착되는 센서 시스템의 경우, 유선에 의한 정보전달이 어려울 뿐만 아니라 센서 내 전원설비가 제한적인 수도 있다. 따라서 본 논문에서는 이러한 문제점에 대한 해결책으로서 밧데리없이 유도결합에 의하여 원격 센서로부터 정보 취득이 가능한 한 방법을 제안하였다. 이 방법은 전원공급에 의한 유도 결합식의 원격 센서 시스템과는 달리, 원격 센서의 정전용량을 변 복조 과정 없이 재귀적 최소 자승 추정법에 의해 센서의 정전용량을 고정도로 추정하는 것이다. 이를 위하여 시 스템의 유도결합 모델을 사용하였으며, 모델 파라미터가 시간에 따라 변화하는 경우에는 망각률을 사용하여 정확도가 높은 원격 센서 시스템을 구현할 수 있었다.

• Proceedings of the KOSOMBE Conference
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• v.1993 no.11
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• pp.190-193
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• 1993

본 연구에서는 개인용 컴퓨터(PC), 모델(MODEM), 그리고 공중회선망(PSTN)을 이용하여 다수의 환자와 병원사이에 환자 정보 및 처방정보를 주고 받을 수 있는 시스템을 구성하였다. 시스템의 구성은 환자에게서 측정된 아나로그 신호를 Analog to Digital Converter에 의해 디지탈 신호로 변환 시킨후 공증회선망을 이용하여 의사 컴퓨터에 측정된 정보를 전해주고 의사의 처방등을 다시 공중회선망을 통해 서어비스받는 형식을 취했다. 본 논문에서는 크게 두가지 점에 초점을 두었다. 첫째로 아나로그신호인 심전도 (ECG:Electrocardiogram)를 컴퓨터에서 사용가능한 화일로 생성하고, 전송해서 치사의 모니터에 본래의 파형과 비교해 왜곡이 적은, 신호로 출력해 주는데 있고, 둘째는 거의 모든 메세지를 한글화 하였고, pull down menu 구동 방식을 채택하여 컴퓨터사용에 초보적인 사람들도 쉽게 사용할 수 있게 하였다.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1680-1681
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• 2007

This paper deals with RLS algorithm using Newton-Raphson method based adaptive forgetting factor for a passive telemetry RF sensor system in order to estimate the time variant parameter to be included in RF sensor model.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.73-76
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• 2014

현재 네트워크 시스템은 유선에서 무선으로 발전하면서 많은 업무가 모바일 기반의 업무로 변화되고 있다. 그 중 대표적인 것이 모바일 오피스 시스템으로 중요 구성요소 중 하나인 커뮤니케이션은 구성원간의 단문 메시지 서비스(SMS)이다. 그러나 최근 무선 환경의 발전으로 단문 메시지 전송 방식이 SMS에서 모바일 메신저로 변화하고 있으나 그에 대처하지 못한 시스템들이 있다. 이에 본 논문에서는 모바일 오피스 시스템에서 사용되고 있는 SMS를 대체하여 MQTT(Message Queuing Telemetry Transport) 프로토콜을 이용한 협업 메신저 시스템을 설계 및 구현한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.1
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• pp.212-221
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• 2001

This paper deals with the design techniques for underwater acoustic basin. An underwater acoustic basin is needed for test and calibration of acoustic sensors, acoustic digital communication system, acoustic measurement system, and underwater image data telemetry system. KRISO(Korea Research Institute of Ships and Ocean Engineering) have planned the construction of an underwater acoustic tank from 1999 to 2001 through internal project. We studied about absorbtion characteristics of a porous re-cycled rubber which is selected as a absorption materials and designed absorption plate with wedge shape. The simulation of reflection analysis along the wedge angle for wedged type plate was presented.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2000.05a
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• pp.371-377
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• 2000

This paper deals with the design techniques for underwater acoustic basin. An underwater acoustic basin is needed for test and calibration of acoustic sensors, acoustic digital communication system, acoustic measurement system, and underwater image data telemetry system. KRISO(Korea Research Institute of Ships and Ocean Engineering) have planned the construction of an underwater acoustic tank from 1999 to 2001 through internal project. We studied about absorbtion characteristics of a porous re-cycled rubber which is selected as a absorption materials and designed absorption plate with wedge shape. The simulation of reflection analysis along the wedge angle for wedged type plate was presented.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.39 no.9
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• pp.896-903
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• 2011

In this paper, a co-design method for JPEG2000 video compression system using DSP and FPGA is presented. By profiling the complexity of JPEG2000 algorithm, it is noticed that a MQ-coder is the most complex part. Thus, we implement the MQ-coder on FPGA for the parallel processing using VHDL to reduce the complexity. In order to verify the performance of the MQ-coder, JBIG2 standard test vector and images are used. The experimental results show that the proposed MQ-coder enhances the processing time approximately 3 times compared with the previous software MQ-coder.

• Journal of Sensor Science and Technology
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• v.21 no.5
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• pp.352-358
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• 2012

A sensor network system can be an efficient tool for healthcare telemetry for multiple users due to its power efficiency. One drawback is its limited data size. This paper proposed a real-time application of data compression/decompression method in u-Health monitoring system in order to improve the network efficiency. Our high priority was given to maintain a high quality of signal reconstruction since it is important to receive undistorted waveform. Our method consisted of down sampling coding and differential Huffman coding. Down sampling was applied based on the Nyquist-Shannon sampling theorem and signal amplitude was taken into account to increase compression rate in the differential Huffman coding. Our method was successfully tested in a ZigBee and WLAN dual network. Electrocardiogram (ECG) had an average compression ratio of 3.99 : 1 with 0.24% percentage root mean square difference (PRD). Photoplethysmogram (PPG) showed an average CR of 37.99 : 1 with 0.16% PRD. Our method produced an outstanding PRD compared to other previous reports.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.32 no.7
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• pp.83-90
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• 2004

This paper describes on-board decentralized data acquisition system that acquires and encodes the numerous sensor data distributed on the big flight vehicles efficiently. The system's sub-units which have one encoder unit and several remote units were designed and simulated according to the communication protocols and the control, sequence logics based on the FPGA chip. And we have made the functional verification of the acquisition, collection and formatting of remote analog and digital data for the manufactured hardwares.