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Using Pulse-Front Tilt to Measure Laser Pulses Less Than 100 Picoseconds in Duration
Jeong, Hoon Optical Society of Korea 2015 한국광학회지 Vol.26 No.6
We demonstrate a frequency-resolved optical grating (FROG) device for measuring the intensity and phase versus time of several-tens-of-picoseconds laser pulses, using a thick nonlinear optical crystal. The huge pulse-front tilt generated by a holographic grating increases the temporal range of the device, which can make a single-shot measurement of laser pulses less than 100 ps in duration. To verify the measurement technique, we generate double pulses using a Michelson interferometer. The measured duration of a single pulse is about 300 fs and the measured maximum delay of two pulses is 60 ps, which implies that the proposed FROG device can measure laser pulses with maximum pulse width of about 120 ps.
The Design and Implementation of a DVB-RCS Modulator Using Single FPGA
Jeong, Hoon,Lee, Seung-Joon,Cho, Yong-Hoon 통신위성우주산업연구회 2001 Joint Conference on Satellite Communications Vol.2001 No.-
This paper presents the design and implementation of a DVB-RCS return channel modulator using FPGA. The DVB-RGS standard was finalized by DVB in 2000. It provides an efficient way for accessing Internet via satellite. In the DVB-RCS standard, the Multi-Frequency Time Division Multiple Access (MF-TDMA) is used for return channel.. To support the DVB-RCS standard, the return channel modulator has to operate differently timeslot by timeslot, since different timeslots may have different frequencies, transmit symbol rates, or channel codes. For implementation of a DVB-RCS modulator, just one XILINX VIRTEX-E 1600 FPGA is used with some peripherals. This FPGA is designed to have three functional modules, the Parameter store and management module, the Burst generation module, and the Modulation module. The results of this paper show the possibility of the one-chip solution for the DVB-RCS modulator.
이주(移住)의 서사(敍事)와 고려인 공동체의 미래 ― 광주 고려인마을 거주 고려인의 구술생애담을 대상으로 ―
한정훈 ( Han¸ Jeong-hoon ) 전남대학교 호남학연구원 2020 호남학 Vol.0 No.68
본 논문은 광주 고려인마을에 거주하는 이주민 고려인의 구술생애담을 대상으로 개인과 공동체의 문제를 다양한 층위에서 살펴보는 것을 목적으로 한다. 고려인은 강제 이주 후에 소비에트 체제에 철저히 동화하기 시작했다. 그리고 고려인은 ‘소비에트 인민’으로서 집단의 정체성을 구성하면서 구소련 사회에 나름의 입지를 구축했다. 구소련이 해체된 이후 중앙아시아 국가들은 정치·경제·사회적 측면에서 불안정이 계속되었고, 고려인은 기존의 정체성과 사회적 지위를 유지할 수 없었다. 경제 발전을 이룩한 한국은 고려인이 이주하기에 매력적인 장소였다. 하지만 한국은 낭만적으로 상상했던 ‘조상의 나라’가 아니었다. 신자유주의 체제와 각종 효율성이 일상을 지배하는 장소였다. 고려인은 외모가 비슷할 뿐, 현대의 한국인과 동일할 수 없는 위치에 있음을 깨닫는다. 끊임없이 접촉해 오는 타자적 시선은 한국 사회에서 나름의 사회적 정체성 정립을 고려인에게 요구했다. 고려인의 한국 이주가 시간이 지나면서 세대를 달리하며 이어지고 있다. 본 연구는 고려인의 한국 이주가 시간의 흐름 속에서 어떤 모습으로 진행되었고, 그 과정에서 고려인 개인과 그들의 공동체가 어떤 대응을 하였는가를 살펴보고자 한다. 나아가 고려인의 이주 세대가 바뀌어감에 따라 어떤 문제들이 새롭게 적층해 가고 있는 살펴보고자 한다. The purpose of this study is to examine the problems of individuals and communities from various levels focusing on oral life narratives of migrants, Goryeo people living in the Goryeo people village in Gwangju city. Goryeo people began to assimilate thoroughly into the Soviet system after the forced migration. And Goryeo people, as 'Soviet People', formed their own position in the former Soviet Union, establishing an identity of the group. After the dissolution of the former Soviet Union, Central Asian countries continued to be unstable in terms of politics, economy and society, and Goryeo people were unable to maintain their existing identity and social status. Korea, which achieved economic development, was an attractive place for Goryeo people to migrate. But Korea wasn't the ‘country of ancestors’ that was romantically imagined. The country is where the neoliberal system and various efficiencies were the dominance of everyday life. Goryeo people realize that their appearances are similar, and that they cannot be identical to modern Koreans. The constant contact with people with third-party eyes demanded Goryeo people to establish their own social identity in Korean society. Goryeo people's migration to Korea continues over generations as time goes. This study attempts to examine how Goryeo people's migration to Korea has progressed, and in the process, how Goryeo people and their communities responded. Furthermore, this study attempts to investigate what problems are newly stacked up as the migration generation of Goryeo people changes.
Jeonghoon Ha(Jeonghoon Ha) J-INSTITUTE 2022 International Journal of Terrorism & National Secu Vol.7 No.2
Purpose: In Korea's industrial sites, the state standardizes the skills required to perform duties and supports to foster the field-oriented talents, yet the use of the National Occupational Competency Standards in the security industry is very inadequate. Method: In this study, the current status of the security industry and the operation of the National Occupa-tional Competency Standards are reviewed, and the National Occupational Competency Standards for the devel-opment of the security industry are conducted based on the interviews with the experts applying to the security industry using the National Occupational Competency Standards towards the efficient use of the Standards. Results: In the security industry, the National Occupational Competency Standards are not functioning properly given the dual contents provided by the existing Security Services Industry Act and the new National Occupational Competency Standards. Accordingly, it is required to change the legislative system which can more actively utilize the Security Services Industry Act and National Occupational Competency Standards and further improve the National Occupational Competency Standards. Conclusion: For the development of the security industry, this study presents the following conclusions. First, in the security industry and the NCS-based education system, the curriculum of the Security Services Industry Act and the education system of the NCS must be unified to reestablish the curriculum. Second, the classification of the duties of the Security Services Industry Act and the level of the NCS according to the occupational rating must be reestablished in a systematic and progressive direction by comprehensively examining the industrial reality and foreign cases. Third, it must be redeveloped as a comprehensive and efficient model by collecting the opin-ions of experts in each field for the inspection of the security industry and the NCS-based system.
Development of Integrated Dynamics Control System of SUV Vehicle with Front and Rear Steering System
Jeonghoon Song(송정훈) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.6
In order to improve stability and controllability of SUV vehicle, Integrated Dynamics Control system with Steering system (IDCS) was developed. Eight degree of freedom vehicle model and front and rear steering system model were used to design IDCS system. It also employs Fuzzy logic control method to design integrate control system. The performance of IDCS was evaluated with two road conditions and several driving conditions. The result shows that SUV vehicle with IDCS tracked the reference yaw rate under all tested conditions. IDCS reduced the body slip angle also. It represents IDCS improves vehicle stability and steerability.
Nonlinear Observer and Robust Controller Design for Enhancement of Vehicle Lateral Stability
Jeonghoon Song,Kwangsuck Boo,Dae Hee Lee 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.1
This paper describes the design of a sliding mode controller to control wheel slip. A yaw motion controller (YMC), which uses a PID control method, is also proposed for controlling the brake pressure of the rear and inner wheels to enhance lateral stability. It induces the yaw rate to track the reference yaw rate, and it reduces a slip angle on a slippery road. A nonlinear observer is also developed to estimate the vehicle variables difficult to measure directly. The braking and steering performances of the anti-lock brake system (ABS) and YMC are evaluated for various driving conditions, including straight, J-turn, and sinusoidal maneuvers. The simulation results show that developed ABS reduces the stopping distance and increases the longitudinal stability. The observer estimates velocity, slip angle, and yaw rate very well. The results also reveal that the YMC improves vehicle lateral stability and controllability when various steering inputs are applied. In addition, the YMC enhances the vehicle safety on a split-μ. road.