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저고도 운용 항공기를 위한 기상정보의 필요성에 관한 연구
조영진,김수로,Cho, Young-Jin,Kim, Su-Ro 한국항공운항학회 2020 한국항공운항학회지 Vol.28 No.1
According to the Ministry of Land, Infrastructure and Transport press release ('18.12.21.) The amendment of the Aviation Business Act will reduce the capital requirements for aviation leisure operators and make it easier to enter aviation leisure businesses by improving regulations on small air transportation business. In addition, as the scale of the UAV(Unmanned Aerial Vehicle) sector is expected to increase globally, the dramatic increase in low altitude operating aircraft, including this, must be taken into account. The low altitude aircraft category is divided into small airplanes, helicopters, light aircrafts and ultra-light aircrafts, and instructors include school instructor pilots and student pilots, military and national helicopter pilots, and aviation leisure operators. In case of low altitude aircraft, there are cases of canceling operations due to low visibility and low clouds, and aircraft accidents due to excessive operation and sudden weather phenomenon. Therefore, in order to prevent low-altitude aircraft accidents, a safe flight plan based on weather conditions and weather forecasts and more accurate and local weather forecasts and weather forecast data are needed to prepare for the rapidly changing weather conditions.
항공전문인력 양성을 위한 교육 시스템 개선에 관한 연구
조영진,최연철,Cho, Young-jin,Choi, Youn-Chul 한국항공운항학회 2015 한국항공운항학회지 Vol.23 No.4
Recently due to shortage of pilots from aviation developed countries such as America, Japan and etc, not even regional airlines but also major airlines are facing difficulties of pilot shortage. Through statistic data, ICAO and Boeing Company are predicting that roughly 8 thousands of new pilots will be short per year. Therefore, to solve this pilot shortage, countries are searching solutions like reducing air route, and extending regular retirement. This study analyzes domestic pilot supply market and compares systems of pilot training between the domestic system and the system of America and Japan. From the comparison, the study has deducted improvements for the role of domestic certification system, ATO(Approval of Training Organizations) operation, and related organizations including the government.
조영진,Cho, Young-jin 한국항공운항학회 2017 한국항공운항학회지 Vol.25 No.3
A flight simulator is an instrument which lets pilots attain proficiency of handling various emergency situations, and the sense of flying. In this thesis, current status of domestic simulators will be stated, and after showing the problems with the present management of these simulators, comparisons of how and what kind of facilities they are managed around the globe will be made. After comparing and analyzing the difference in the way the simulators are ran, measures of improvement in domestically appropriate simulators and increase of operating facilities will be drawn.
조영진,임지형,이용주,남인철,Cho, Young-Jin,Lim, Ji-Hyung,Lee, Yong-Joo,Nam, Inn-Chul 대한후두음성언어의학회 2016 대한후두음성언어의학회지 Vol.27 No.1
Percutaneous dilatational tracheostomy (PDT) has become an increasingly popular method of establishing an airway for patients in need of chronic ventilator assistance. We report a rare case of a 42-year-old female who developed extensive subcutaneous emphysema, bilateral pneumothoraces, pneumomediastinum, and pneumoperitoneum after percutaneous dilatational tracheostomy. The patient suffered from amyotrophic lateral sclerosis, and underwent PDT after a period of mechanical ventilation. During PDT, tracheostomy tube was inserted into the paratracheal space. Follow-up chest radiography and computed tomography of chest and abdomen revealed extensive subcutaneous emphysema, bilateral pneumothoraces, pneumomediastinum, and pneumoperitoneum. The patient was treated successfully with insertion of the thoracostomy tube and conservative care.
허리 근육의 근전도 신호 안정성이 주파수 분석에 미치는 영향
조영진(Young?Jin Cho),김정룡(Jung?Yong Kim) 대한인간공학회 2010 大韓人間工學會誌 Vol.29 No.2
The purpose of this study is to investigate the stationarity of the electromyographic signal in various flexion angles, loads, and window sizes, which influence the result of the mean power frequency (MPF) and median frequency (MNF) analysis. Six healthy subjects participated in the experiment. They were tested in the combination of 3-level flexion angles (0 degree, 22.5 degree, 45 degree) and 3-level loads (0Nm, 30Nm, 60Nm). Electromyographic data were collected for 20 seconds during isometric contraction. The stationarity of collected data were analyzed with four different window sizes including 250, 500, 1000 and 2000㎳. Two test methods for stationarity such as Reverse Arrangements Test and Modified Reverse Arrangements Test were used. In order to show the effect of nonstationarity, the increasing/decreasing trend of MPF and MNF trend were discussed. In results, the stationarity of the electromyographic signal decreased as flexion angle increased and load decreased while window size decreased based on Reverse Arrangements Test. The highest stationarity was shown at 500 ㎳ window in Modified Reverse Arrangements Test. The inclination of MNF and MPF indicated 3.6-6.3%, 3.8-5.1% discrepancy compared to the result from stationary data.
Non-Profiling Singular Spectrum Analysis 전처리 기법
조영진(Young-Jin Cho),원유승(Yoo-Seung Won),박애선(Ae-Son Park),한동국(Dong-Guk Han) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
Side Channel Analysis is powerful attack to recover the secret key by using an extra source of information such as timing, power consumption and electromagnetic leakage. Pre-processing scheme is used to retrieve the secret key in the restricted traces in order to improve the attack performance. One of the pre-processing schemes is Singular Spectrum Analysis, which makes the original traces can be split into main signal traces and noise signal traces. In order to diminish cost of SSA, the adversary should choose the criteria to split actual power consumption into two groups according to degree of noise. In previous paper, the criteria is selected as Signal-to-Noise Ratio (SNR) which is one of profiling schemes. In this paper, in order to use SSA practically, we propose that Normalized Inter-Class Variance (NICV) which is adopted as the criteria is non-profiling scheme doesn"t need to secret key. More precisely, we can distinguish the main signal with the scale of NICV. We demonstrate that our proposal attack method yields significantly similar results with another method using SNR through actual experiments on MSP430 microcontroller unit.
유기된 보이드 공간의 전화(轉化)를 통한 공동체 조성계획 - 배다리 산업도로 부지를 중심으로 -
조영진(Cho, Young-Jin),구영민(Koo, Young-Min) 대한건축학회 2019 대한건축학회 학술발표대회 논문집 Vol.39 No.2
Despite the fact that Baedari village is the very Historio-Cultural Preservation Areas exhibiting the modernization of Incheon, the area has been divided into two and remained as a no man’s land with trace of discontinued development by thoughtless urban plan. Having the unexpected void a new strategic turning point by which a mediate platform is to be made for creating a new relationship with neighboring context, the study purpose to generate a new cultural community that succeeds the continuity of daily life by patching the void with the potential of residential and cultural urban fabric.
런 검정을 사용한 근전도 신호의 안정성 평가 시 분할 크기가 신호의 안정성에 미치는 영향
조영진(Young?Jin Cho),김정룡(Jung?Yong Kim) 대한인간공학회 2010 大韓人間工學會誌 Vol.29 No.4
Runs test is a mathematical tool to test the stationarity of electromyographic (EMG) signals. The purpose of this study is to investigate the effects of segmentation size on the stationarity of EMG signals in runs test. Six subjects participated in this experiment and performed isometric trunk exertions for twenty seconds at the load level of 25% and 50% MVC. The signals extracted from the erector spinae muscles were divided into the intervals of 1000ms and the stationarity of the signal in each interval was tested by the runs test. In this test, seven segmentation sizes such as 1.0, 2.0, 3.9, 7.8, 15.6, 31.3 and 62.5ms were applied. Additionally, two stationarity tests of reverse arrangements test and modified reverse arrangements test were used to verify the results of the runs test. In results, the segmentation size of 62.5ms showed the similar results with the other stationarity tests. However, the stationarity values among there tests were different each other when segmentation sizes other than 62.5ms were used. These results indicated the effect of segmentation size in runs test that needs to be considered to have consistent and sensitive result in stationarity test.