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Surface smoothing of poly(methyl methacrylate) film by laser induced photochemical etching
Kang, JoonHyun,Lee, Song-ee,Park, Joon-Suh,Kim, Young-Hwan,Han, Il Ki IOP Publishing 2017 Japanese journal of applied physics Vol.56 No.9
<P>The surface of poly(methyl methacrylate) (PMMA) film was etched by laser irradiation under O-2 and vacuum conditions. By activating the O-2 molecules near the rough surface, oxygen radicals will preferably etch the protrusions on the PMMA surface. Three lasers of different wavelengths were used for comparison. Laser irradiation at a short wavelength such as 325 nm resulted in high etch rates whereas a long wavelength such as 532 nm resulted in no effect on the surface profile. The PMMA surface was not etched under the vacuum condition, indicating the necessity of O-2 molecules in etching. (C) 2017 The Japan Society of Applied Physics</P>
한국인 두개안면부 계측치 : 119개 항목의 성별 및 연령별 정상치 및 표준 편차와 표준화 형판
강진성,조준현,한기환 大韓成形外科學會 1993 Archives of Plastic Surgery Vol.20 No.5
Craniofacial surgeons view syndromic patients with variants in form of face and cranium. Syndrome identification has become a sophisticated science that requires a precise knowledge of dysmorphology for correct cataloging. The need for accurate general population baseline data on the growing human face and cranium has become even more evident. We undertook study to record craniofacial anthropometric measurements in 1,300 normal healthy Koreans, age ranged from 6 to 18 years. Twenty-six groups, each composed of 50 peoples of each sex who residents in downtown areas(Taegu and Andong)were included in this study. One hundred and nineteen measurements have been made by one person, using meticulous and constant techniques. The measuring techniques, results and analysis of data are described in the paper. In addition to obtaining normal anthropometric values, we developed 78 standardized templates that were drawn from normal data. Our study supplies the plastic surgeon and others with specialized interests in the craniofacial surgical area with fundamental normative population data that will help them decide what is abnormal. And corrective surgery of the face and cranium is becoming so precise that the techniques and data detailed in this paper are essential to its further development.
조준현,송중원,강진성 大韓成形外科學會 1993 Archives of Plastic Surgery Vol.20 No.5
The rate of thumb injury increases with the development of mechanical industry. Aesthetically, hand is a critical part of body image and activity of hand is greatly dependent upon the thumb, which accounts for 40-50 percent of hand function, so every effort should be made to restore aesthetic as well as functional deficits of the thumb in traumatic thumb loss; careful consideration of functional requirements of the thumb including adequate length, mobility, stability, sensation, and aesthetics is important when planning a reconstructive procedure. The development of microvascular techniques makes traditional techniques nearly obsolete, many patients, however, opt not to choose microvascular techniques which sacrifice a toe or other uninjured tissues in order to regain a new thumb and will be best served by more conservative measures. The choice of the optimal reconstruction among many reconstructive methods should be governed by the level and type of injury as well as the needs and general condition of the patient and surgeon's technical training. The authors experienced 21 cases of parital thumb loss in which replantation was, impossible from April 1989 to February 1991. The majority of patients wee active aged male. The type and cause of injury was mainly crushing by press machine. The level of thumb loss was distal one third in 12 cases, middle one third in 9 cases and none in proximal one third. Reconstructive methods were 4 palmar advancement flaps, 3 radial sensory innervated cross finger flaps, 4 neurovascular island flaps, 4 osteoplastic thumb reconstruction, 2 Gillies' "cocked hat" flaps, 2 phalangizations, and 2 wrap around procedures.
Software-Based Selective Validation Techniques for Robust CGRAs Against Soft Errors
Ko, Yohan,Kang, Jihoon,Lee, Jongwon,Kim, Yongjoo,Kim, Joonhyun,So, Hwisoo,Lee, Kyoungwoo,Paek, Yunheung Association for Computing Machinery 2016 ACM transactions on embedded computing systems Vol.15 No.1
<P>Coarse-Grained Reconfigurable Architectures (CGRAs) are drawing significant attention since they promise both performances with parallelism and flexibility with reconfiguration. Soft errors (or transient faults) are becoming a serious design concern in embedded systems including CGRAs since the soft error rate is increasing exponentially as technology is scaling. A recently proposed software-based technique with TMR (Triple Modular Redundancy) implemented on CGRAs incurs extreme overheads in terms of runtime and energy consumption mainly due to expensive voting mechanisms for the outputs from the triplication of every operation. In this article, we propose selective validation mechanisms for efficient modular redundancy techniques in the datapaths on CGRAs. Our techniques selectively validate the results at synchronous operations rather than every operation in order to reduce the expensive performance overhead from the validation mechanism. We also present an optimization technique to further improve the runtime and the energy consumption by minimizing synchronous operations where a validating mechanism needs to be applied. Our experimental results demonstrate that our selective validation-based TMR technique with our optimization on CGRAs can improve the runtime by 41.0% and the energy consumption by 26.2% on average over benchmarks as compared to the recently proposed software-based TMR technique with the full validation.</P>
김덕현(Dukhyun Kim),강동기(Donggi Kang),이형진(Hyoungjin Lee),조준현(Joonhyun Cho),정해영(Haeyoung Jung) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.12
초소형 유도무기에 대한 개발 필요성이 부각되고 있는 상황에서 본 연구를 통해 초소형 열가소성 추진기관을 적용한 비행체를 개발함으로써 추후 실제 초소형 유도무기 추진기관 개발 가능성을 확인하고자 하였다. 추진기관 성능 분석을 통하여 초소형 추진기관의 요구 성능을 도출하였으며 요구조건을 만족하기 위한 저 연소속도 추진제 조성을 개발 및 공력 형상 설계를 수행하였다. 지상연소시험를 통하여 추진제 성능 및 추진기관의 성능을 확인하였고, 실제 비행 시험을 통해 성능 분석 결과와 일치하는 것을 확인함으로써 초소형 추진기관 개발 가능성을 확인하였다. In a situation that a needs of subminiature guided missile development is being magnified, an unguided missile appled thermoplastic propellant was developed to confirm a possibility of development on subminiature guided missile rocket motor. A requirement of rocket motor was derived by conducting performance analysis. A propellant composition having low burning rate was developed and an aerodynamic configuration design was conducted to satisfy the requirement. The performance of propellant and rocket motor was confirmed through ground firing test. The possibility of development subminiature rocket motor was confirmed by ascertaining the fact that the simulation results was in close agreement with the flight test results.