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권혁동 空軍士官學校 1989 論文集 Vol.27 No.-
Carefully machined cylinder-to-two-cylinder shell was tested and the erperimentally determined stresses were compared with theoretical predictions obtained from a thin-shell finite-element analysis. The model was idealited structure consisting of cylindrical shells interesting at right angle and nozzles paralleled. The experimental results were compared to the finite-element predictions and these data can be utilized to the design and production of the elastic shells.
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권혁동,서기열,박계각,Kwon, Hyuk-Dong,Seo, Ki-Yeol,Park, Gyei-Kark 해양환경안전학회 2004 해양환경안전학회지 Vol.10 No.1
Many lighthouses have been built for safety navigation of vessel, but the management of lighthouses had to paid for maintenance costs. For that reason, the remote control system for the lighthouse is to be used, but the communication expense is very expensive because of the use of satellite communication network or the RF communication network Also, the state of lighthouse is difficult to analyze as transmit only measured data. Therefore, this paper embodied the remote control system for the lighthouse using CDMA method, that was extended to island area and we verified the effectiveness of the proposed system.
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로란-C 시스템의 현황과 효율적인 활용방안에 관한 연구
권혁동,서기열,박계각,Kwon, Hyuk-Dong,Seo, Ki-Yeol,Park, Gyei-Kark 해양환경안전학회 2004 해양환경안전학회지 Vol.10 No.2
The development motive and maintenance of navigation system were military strategy purpose since middle of 20th century. During cold war period between the United States and the Soviet since the Second World War, advanced navigation system that two countries are responded individually have done development competitively. These systems are exhibited on general except military purpose gradually and are taking charge of point role in economy transport activity such as transportation of logistics between the country. Navigation system can divide into ground system and satellite system. Representative system of ground system is Loran-C(Long Range Navigation), and representative system of satellite system is GPS(Global Position System). Loran-C system is a system that use much in all the world country sea and ground, but GPS and DGPS that present is a satellite navigation system are used much. According to development of satellite system, examine about actual conditions of Loran-C navigation system and practical use plan in this paper because there is controversy about role of Loran-C navigation device along with Loran-C's operation and user decrease, and discusses for Loran-C's development direction.
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향상된 보안의 닌텐도 스위치 행렬 형태 보안 키패드 제안
권혁동,권용빈,최승주,서화정,Kwon, Hyeok-dong,Kwon, Yong-bin,Choi, Seung-ju,Seo, Hwa-jeong 한국정보통신학회 2019 한국정보통신학회논문지 Vol.23 No.9
The Nintendo Switch(NSW), which appeared as an 8th generation console, has succeeded worldwide as a hybrid gaming console. The NSW has E-shop itself, users can sign in to their account and purchase games. The keypad built in the NSW is similar to QWERTY keyboard. In the password input field the input information is hidden, but it's possible to get the value entered from the keypad with shoulder surfing attack. Because of the NSW with many party or family games, there is a high probability that someone else is watching the screen nearby, which acts as a vulnerability in account security. Thus we designed the new keypad which improve from this issue. In this paper, we check the problem about the keypad which built in the NSW, we present the proposed keypad and the compared to the built in keypad by showing the test result of unspecified individuals use.
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視覺訓練이 反應速度에 미치는 影響 : 13歲 女學生을 中心으로
權赫東 釜山水産大學校 1982 論文集 Vol.29 No.-
Physical activity is the reaction against stimulus. If the reaction speed is high, activity effectiveness can be raised. So, it is necessary to reduce the reaction speed. In order to lessen the reaction speed, the trainings of removing columns were performed to 10 schoolgirls, thirteen years old, for 4 weeks once a day. Followings are the method. The experience board was covered with 60 pieces of red, yellow, and green columns.(20 pieces each color. one column, 1.2cm in height, 1.5cm in diameter.) After the examiner directed the examine to transfer one by one, each color in turn, with eyesight removing he measured the whole time from beginning to end. And then he compared the record before experience with after experience. The results are as follows; 1. The result after experience had 24.8 sec. decrease than the average. 2. The rate to the result after experience revealed the decrease of 35.4% than the average speed. 3. 't' inspection showed very significant result. (tc:0.05) 4. In speed 6 year-old-girls had 1.92% decrease than 13 year-old-girls did.
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