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대역확산 통신시스템에서의 동기 알고리즘 설계에 관한 연구
강병권 순천향대학교 부설 산업기술연구소 2004 순천향 산업기술연구소논문집 Vol.10 No.2
In this paper, a spread spectrum baseband modem is designed considering short range one-to- multi point communication system. QPSK modulation scheme is used with I channel for synchronization and Q channel for information transmission. In this method, a kind of base station modem continuously or periodically transmits a synchronization signal and other modems obtain and hold the synchronization using this signal. In the transmitter, the microprocessor sends the data from a computer to a FPGA and the spectrum spreading is performed in the FPGA. And in the receiver, the transmitted data is recovered by spectrum despreading and can be shown on a display device by the microprocessor.
강병권 순천향대학교 부설 산업기술연구소 2000 순천향 산업기술연구소논문집 Vol.6 No.2
최근 초고속 멀티 미디어 통신망을 경제적으로 구성할 수 있는 하나의 방안으로서 성층권 통신 시스템에 대한 관심이 증가하고 있다. 성층권 통신 시스템이란 대류권(Troposphere, 지상 10-20 km)위에 존재하는 성층권(Stratosphere, 지상 20-50 km)에 통신 탑재체를 싣고 있는 비행선을 체공시켜 각종 무선 통신 서비스를 제공하는 시스템이다. 본 논문에서는 실측 데이터를 이용한 채널 모델을 적용하여 성층권 통신 채널을 섀도우잉이 포함된 라이시안 채널로 모델링하였으며, 이러한 채널에서의 BPSK시스템의 성능을 분석하였다.
최승연,서지연,황우진,이진희,강병권 순천향대학교 부설 산업기술연구소 2021 순천향 산업기술연구소논문집 Vol.27 No.1
Through the development of transportation technology, we have many options for transportation. In recent years, electric bicycles and kick-boards moved by the power of electric motors have been popularized. Solutions to decrease accidents should also be prepared for these technological developments, but few system has been suggested including driver awareness or policy. In the case of automobiles, communication systems for emergencies such as telematics services are being established and released, but they are not equipped with all vehicles, and in the case of electric kick-boards, the system is not built due to costs and operation. In this paper, a system is proposed in which the location and damage information is automatically transmitted to the designated recipient’s side in case of an emergency. It was designed as a small size to make it easier to mount on the electric kick-board, and attached a vibration and pressure sensor. Through this module and sensor, the designated rescue center, which monitors the server, can minimize accident damage by quickly moving to the location where the accident occurred.
IoT 기술을 활용한 스마트 쇼핑 도우미 구현에 관한 연구
고찬민,이정수,이윤수,이동엽,이진희,강병권 순천향대학교 부설 산업기술연구소 2021 순천향 산업기술연구소논문집 Vol.27 No.1
In this paper, we propose ‘Smart Shopping Cart’ based on Arduino system. We used the ‘Mega Board’ in Arduino series because this cart system use various sensors and devices. The proposed system can contribute to solve social problems, especially demographic cliff and aging society, and can be considered as a solution for decrease in consumption at aging society. The software part of the system was made in the Arduino source format and the APP Inventor algorithm. Also we used bluethooth module for communication with users who want to know intuitive information from the cart.
Counteractions against Changes of Logistics Environment in Northeast Asia
Byeong-Gwon Roh,Hui-Su Kim,Chang-Gwon Yoo,Gi-Pyoung Kim 한국유통과학회 2015 유통과학연구 Vol.13 No.5
Purpose – This study investigated competitive counteractions necessary for continuous growth in a rapidly changing logistics environment in Northeast Asia. Research Design, Data, and Methodology – Using a time series analysis, the study first investigated Northeast Asian trade scale and volume by examining online and offline material from the Ministry of Ocean and Fisheries, Busan Port Authority, and other government agencies. A literature survey was done to investigate the state and prospect of the logistics environment in Northeast Asia including changes in freight volume at major ports in the three Northeast Asian countries. Result – The results of the study suggest using the Trans-Korean Railroad (TKR), as well as promoting the North Pole and South Pole routes, to compete against changes in trade volume and the logistics environment in Northeast Asia. A SWOT analysis was done to examine the effectiveness of these strategies. Conclusions – The findings indicate that the TKR impact, using the Busan Port connecting the Trans-China Railway (TCR), the Trans-Siberian (TSR), and the North Pole Route, may be uncertain in practice considering the uncertainty in international politics.
( Byeong-gwon Yun ),( Seung-joo Lee ),( Hyun-jeong So ),( Won-seob Shin ) 물리치료재활과학회 2017 Physical therapy rehabilitation science Vol.6 No.1
Objective: There are many types of exercises with upper and lower-limb action for activation of abdominal muscles for trunk stabilization. A comparison of the different exercise methods been very useful to enhance the result from the exercise for treatment. The purpose of this study was to investigate through surface electromyography (EMG) the changes in abdominal muscle activity during the performance of three different dead-bug exercise methods performed at three different speeds. Design: Cross-sectional study. Methods: The subjects were 30 healthy adults (13 males and 17 females). We instructed the subjects to perform three different dead-bug exercises. We also applied three different speeds to the dead-bug exercises; 60 bpm, 90 bpm, and 120 bpm with use of a metronome. The assessment of EMG was percentage of maximal voluntary isometric contraction on the rectus abdominis (RA), external oblique (EO), and internal oblique (IO). Results: EMG activation of the RA, EO and IO muscles was significantly greater at the higher speed (p<0.05). There was a significant increase in abdominal muscle activity during the dead-bug exercise performed with both the upper and lower extremities compared to that with only the upper extremity or the lower extremities (p<0.05). Conclusions: These findings demonstrate that the performance of the dead-bug exercise with both the upper and lower extremities combined at a high speed is more effective compared to other exercises. Therefore, it is suggested that more favourable and effective outcomes may occur when the type and speed of the exercise is chosen appropriately.