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조진호,김기태,Jo, Jin-Ho,Kim, Gi-Tae 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.3
Densification behaviors of mixed metal powder under high temperature were investigated. Experimental data of mixed copper and tool steel powder with various volume fractions of Cu powder were obtained under hot isostatic pressing and hot pressing. By mixing the creep potentials of McMeeking and co-workers and of Abouaf and co-workers originally for pure powder, the mixed creep potentials with various volume fractions of Cu powder were employed in the constitutive models. The constitutive equations were implemented into a finite element program (ABAQUS) to compare with experimental data for densification of mixed powder under hot isostatic pressing and hot pressing. Finite element calculations by using the creep potentials of Abouaf and co-workers agreed reasonably well with experimental data, however, those by McMeeking and co-workers underestimate experimental data as observed in the case of pure metal powders.
조진호,백호종,장조원,Cho, Jin Ho,Baik, Ho Jong,Chang, Jo Won 한국항공운항학회 2020 한국항공운항학회지 Vol.28 No.1
A significant growth in local air traffic volume is leading to airway congestion and flight delays especially for Incheon-China and Incheon-Europe sectors. A key method to increase the airway capacity is to place a supplemental airway parallel to the existing one and in cooperation between the aviation authorities between China and Korea, a dual airway track was implemented on December 6, 2018. Here, we use airline A's flight data to analyze the congestion change effect of the new airway. Results show total delay time to Europe is reduced 51% (13.4 to 6.6 minutes) as the delay distribution for 16-30 minutes, 31 minutes and greater decreased from 23.2% to 8.2% and 8.7% to 1.0% respectively. The delay to China also decreased but the drop is not as significant as flights to Europe. This is caused by the difference in flight distance, traffic volume, and characteristics of flights landing and transiting China. Flights to Europe show a broad distribution in altitude allocation and reduction in aircraft separation demonstrating the effectiveness of a dual airway track.
The Communication Satellite Transponder Testing by EGSE System
조진호,이성팔,Jo, Jin-Ho,Woo, Hyung-Je,Lee, Seong-Pal Korea Society of Satellite Technology 2007 한국위성정보통신학회논문지 Vol.2 No.2
EGSE is used to check out satellite payload during the development prior to launch. The EGSE represented in this paper is a test system for Ka band communication transponder of COMS. The EGSE consist of two subsystems as CTS subsystem and PCTS subsystem. Communication Test subsystem (CTS) performs satellite transponder RF performance testing, data analysis and trending. Most of transponder RF performances are automatically tested by the CTS subsystem. Power, Command & Telemetry subsystem (PCTS) monitor telemetry messages from the transponder and send tele-commands to satellite transponder for the configuration change. PCTS also provide simulated S/C power to the transponder during the ground validation testing. The EGSE test functions are verified by the transponder simulator testing and will be used for the flight model transponders testing.
자건대멸의 색택, 어취 및 in vitro 칼슘 흡수율에 미치는 주정과 유기산 처리의 효과
조진호(Jin-Ho Jo),장해진(Hae-Jin Jang),조승목(Seung-Mock Cho),이양봉(Yang-Bong Lee) 한국식품영양과학회 2005 한국식품영양과학회지 Vol.34 No.9
자건대멸분말의 색택 개선을 위한 주정 처리의 최적화를 ΔE값을 종속변수로 하여 반응표면분석법으로 알아본 결과, 멸치의 건조중량 대비 7배의 주정을 50℃에서 9시간동안 처리하는 것이 최적조건으로 설정되었고, 그 조건에서 제조되어진 자건대멸분말을 soxhlet법과 SPME와 GC로 지방과 TMA를 측정한 결과, 무처리구에 비해 각각 81.1, 77.4% 제거되었다. 자건대멸분말의 TMA에 유기산들을 1% 농도로 실온에서 20분간 처리한 결과, citric acid가 가장 효과가 높았다. 주정과 citric acid를 병행처리한 결과, 90%의 제거율을 보여 가장 좋은 효과를 나타내었다. In vitro 칼슘 흡수율에서는 병행처리구의 칼슘 흡수율이 12.3%로 무처리구 2.9%에 비해 흡수율이 많이 증가하는 것으로 나타났다. The optimization of ethanol treatment was carried out by response surface methodology (RSM) which was expressed through change of ΔE value for improvement of color of dried large anchovy. The optimum condition was shown as treatment with 7 volumes (v/m) of ethanol at 50℃ for 9 hrs. At this condition, the removal rates of trimethylamine (TMA) and fat considered as fishy odor-causing materials were 81.1 and 77.4%, respectively, when analyzed by solid phase microextraction (SPME)/gas chromatography and soxhlet method, respectively. The effect of citric acid on the removal rate of TMA was the highest one among organic acid treatments. The removal rate of TMA was affected greatly by the concentration of organic acid rather than the temperature and time of treatment. 73% of TMA was removed by treatment of 1% of citric acid at 20℃ for 20 min. Specially, above 90% of TMA could be removed by the combination of alcohol and citric acid treatment. In vitro absorption rate of calcium was also increased to 12.3% by the combination of alcohol and citric acid treatment compared with 2.9% of control.
論文(논문) : 태양폭풍이 항행안전시설에 미치는 영향분석
조진호 ( Jin Ho Jo ),박재우 ( Jae Woo Park ),정철오 ( Cheol Oh Jeong ),김재훈 ( Jae Hoon Kim ),김기현 ( Gye Hyeun Kim ),박형택 ( Hyeung Tak Park ) 한국항공운항학회 2012 한국항공운항학회지 Vol.20 No.2
The solar storm generated by solar activity can be impact on earth in various area. If solar storm impact on Navaids system, it will be a serious problem for aviation and human safety. The impact analysis of solar strom on Navaids system are performed in three area, ILS, GPS navigation and radio communication for aviation. Analysis result show that Instrument Landing System(LLZ, GP, MB) and Navaids system(VOR, DME, Radar) are not impacted by the solar storm, but GPS system is impacted by solar storm. Also analysis result show that VHF/UHF radio system are not impacted by solar storm, but HF radio system is impacted by solar storm.