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이종형,최성대,정선환,권현규,양성현,Lee, Jong-Hyung,Choi, Seong-Dae,Cheong, Seon-Hwan,Kwon, Hyun-Kyu,Yang, Seong-Hyeon 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.4
High manganese steel was maintained stability of Non-Magnetics performance. Fatigue tests were carried out under constant stress amplitude, using a non-magnetic high manganese steel. The fatigue crack growth mechanism of the high manganese steel was clarified from results such as observation of crack growth path and fracture surface. The result of getting this study was shown as following: 1) Remarkably ${\Delta}Kth$ of the high manganese steel is big with about 3 times of the general steel product. 2) In the low ${\Delta}K$ value region, da/dN is dependent on Kmax, and in the high ${\Delta}K$ value region, it is dependent on ${\Delta}Keff$. The reason of this behavior is crack closure due to fracture surface roughness and fretting oxide. 3) It seems to ease the stress concentration of crack tip crack growth behavior in the ${\Delta}Kth$ vicinity by the generation of the secondary crack.
이종형,Lee, Jong-Hyeong 한국과학기술단체총연합회 1970 과학과 기술 Vol.3 No.3
1.서 2.한의학의 유래 3.한의학의 원리 4.한의학의 질병관 5.결어
이종형,최병호,김정,Lee, Jong-Hyung,Choi, Byung-Ho,Kim, Jeong 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.1
In a study on the development of Cu-based sintered friction materials, the specimens pressed with various compacting pressures $(3-6 ton/cm^2/)$ have been evaluated to find the optimum condition of compacting pressure. As compacting pressure increased up to $(5 ton/cm^2/)$, mechanical properties such as density, hardness, bending strength, wear and coefficient of friction, etc. improved remarkably, but up to 6 ton/cm$^{2}$, decreased slightly because of traps of gases and water vapors in specimen. Disk assembly composed of 12 pieces of Cu-based friction materials has been compared with one of asbestos-and nonasbestos-based friction materials. In dynamic and driving tests to find burst spin strength, corrosion area rate and friction properties, etc., Cu-based sintered friction materials showed better properties than the others, especially in severe conditions because oxides such as $Cu_2O; and; SnO_2$ in the friction surface of friction materials were formed.
이종형,이종수,Lee, Jong-Hyeong,Lee, Jong-Su 한국전자통신연구원 1988 전자통신동향분석 Vol.3 No.3
손으로 쓴 필화정보를 음성과 함께 전달하는 텔리라이팅 단말기의 국제 표준화동향을 소개하였다. 필화정보 압축부호화 방법으로 CCITT에서 권고하고 있는 Zone Coding 방법과 Differential Chain Coding 방법을 비교 분석하였다.
이종형,윤석환,Lee, Jong-Hyeong,Yoon, Seok-Hwan 한국농공학회 2005 한국농공학회논문집 Vol.47 No.6
Accurate estimation of the spatial distribution of rainfall is critical to the successful modeling of hydrologic processes. The objective of this study is to evaluate the applicability of spatially distributed rainfall data. Spatially distributed rainfall was calculated using Kriging method and Thiessen method. The application of spatially distributed rainfall was appreciated to the runoff response from the watershed. The results showed that for each method the coefficient of determination for observed hydrograph was $0.92\~0.95$ and root mean square error was $9.78\~10.89$ CMS. Ordinary Kriging method showed more exact results than Simple Kriging, Universal Kriging and Thiessen method, based on comparison of observed and simulated hydrograph. The coefncient of determination for the observed peak flow was 0.9991 and runoff volume was 0.9982. The accuracy of rainfall-runoff prediction depends on the extent of spatial rainfall variability.
Optimization of 40 Gb/s WDM Systems Using Super-Gaussian RZ Pulses
이종형,Dae-Hyun Han,Yong-Jae Lee 한국광학회 2008 Current Optics and Photonics Vol.12 No.4
40 Gbps WDM Systems using super-Gaussian RZ pulses have been studied by numerical simulation to optimize their performance. The assumption of standard single mode fiber is valid when existing WDM systems are required to upgrade their performance to 40Gbps. It is shown that the standard single mode fiber can transmit optical signals over 720 km (Q > 10) by optimizing optical and electrical filter characteristics at the receiver and by compensation of dispersion. However, it is also shown that ±0.3% dispersion compensation tolerance per span (80 km) could prohibit transmitting over 320km (Q > 10). In addition, a duty cycle of less than 0.4 degrades system performance significantly.
NRZ 방식을 이용한 40Gbps WDM 시스템의 최적화
이종형,한대현,이용재,최병윤,Lee, Jong-Hyung,Han, Dae-Hyun,Lee, Yong-Jae,Choi, Byeong-Yoon 한국정보통신학회 2008 한국정보통신학회논문지 Vol.12 No.10
40Gbps로 동작하는 WDM시스템의 성능 최적화를 위해 그 특성을 numerical simulation 을 통해 알아 보았다. 이때 광섬유는 가장 널리 사용되고 있는 표준 단일 모드로 가정하였으며, 변조 방식 역시 가장 간단하면서 널리 사용되고 있는 NRZ 방식을 사용하였다. 이는 40Gbps의 새로운 시스템을 설치하는 경우보다 기존의 시스템에서 각 채널의 전송율을 40Gbps로 증가시킴으로써 최종 전송용량을 향상시킬 경우를 고려하였기 때문이다. 수신단의 필터(optical 및 electrical) 특성을 최적화하고 색분산 보상 및 입력신호 크기의 최적화를 통해 기존에 매설된 단일 모드광섬유로 약 480km (BER < 10-15)까지 전송할 수 있음을 알았다. 또한 시스템의 성능이 EDFA의 ASE 노이즈 특성에 의해 크게 제한 될 때, 수신단의 광 필터는 삽입 손실이 5dB 이상 크지 않다면, Gaussian모양보다는 Flattop 모양의 광 필터가 성능개선에 더 유리함을 알 수 있었다. 40Gbps WDMSystems have been studied by numerical simulation to optimize their performance. Standard single mode fiber is assumed, and the most popular modulation format, NRZ, is used for the study. These assumptions are valid when existing WDM systems are required to upgrade their performance to 40Gbps. It is shown that the standard single mode fiber can transmit optical signals over 4800 (BER < 10-15) by optimizing optical and electrical filter characteristics at the receiver and by compensation of dispersion. In addition, when the system performance is mainly limited by ASE noise of EDFAs, it is found that flattop-shaped optical filter at the receiver gives a better result than Gaussian-shaped filter unless the insertion loss of the optical filter is larger than 5dB.