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동시 경화 제작기법을 적용한 이종 수지 복합재의 열적/기계적 특성에 관한 실험적 연구
윤진영,최지덕,박철용,김영규,Yoon, Jin-Young,Choi, Jiduck,Park, Cheolyong,Kim, Younggyu 한국군사과학기술학회 2020 한국군사과학기술학회지 Vol.23 No.5
Individual curing process of each layer in two resin composites can be caused the separation between two layers. In this study, co-curing process for two resin composites is suggested to improve the inter-layer bonding. Glass fiber reinforced composites with phenolic and epoxy resins were manufactured by co-curing process, and several types of glass/phenolic composites were considered to confirm the application on two resin composites. Experiments for smoke resistance, scratch resistance and flexural strength were carried out to verify requirements corresponding to thermal and mechanical environments. It was validated that two resin composites with phenolic resin impregnated prepreg exhibits good thermal and mechanical characteristics, and it can serve as highly effective composite structures in aerospace and many industry areas.
윤진영,최덕균,Yoon, Jin-Young,Choi, Duck-Kyun The Korea Association of Crystal Growth 1997 韓國結晶成長學會誌 Vol.7 No.1
본 연구는 수소로 희석된 $B_2H_6$를 도판트 소스 가스로 사용하여 이온 질량 주입(ion mass doping)을 하였을 때 다결정 박막의 전기적 특성과 도판트의 활성화시 방사 손상(radiation damage)의 효과에 대하여 고찰하였다. 다결정 박막에서 보론(boron)의 SIMS 분석과 컴퓨터 시뮬레이션인 TRIM92를 비교해서 가장 주입 확률이 높은 이온의 종류는 $B_2H_x\;^+$(x=1, 2, 3‥‥) 형태의 분자 이온임을 알았다. 높은 에너지의 질량 이온 주입 결과 시간에 따라 변화하는 비정질화된 층의 분율이 다결정 박막 내에 연속적인 비정질 충으로 존재하였다. 주입 이온의 질량 분리가 일어나지 않는 이온 질량 주입법(ion mass doping technique)에 의해 비정질화는 유발된다. 손상된 시편의 중간 열처리 온도 범위에서 도판트 활성화 거동과 역 열처리(reverse annealing) 효과가 관찰되었다. 이와 같은 연구의 결과 p-채널 다결정 박막 트랜지스터의 오프 스테이트(off-state) 전류는 방사 손상(radiation damage)에 의존한다. The electrical properties of polysilicon thin films implanted with $B_2H_6$ diluted in $H_2$ as dopant source using ion mass doping technique and the effect of radiation damage on the dopant activation behavior were investigated. Comparing the SIMS profiles of boron in polysilicon films with that obtained from computer simulation using TRIM92 the most probable ion species were $B_2H_x\;^+$(x=1, 2, 3‥‥) type molecular ions. As a result of the Implantation of energetic massive ions, a continuous amorphized layer was created in polysilicon films where the fraction of amorphized layer varied with doping time. This amorphization comes from the fact that mass separation of implanting species is not employed in this ion mass doping technique. In the dopant activation behavior, reverse annealing phenomenon appeared in the intermediate annealing temperature range for a severely damaged specimen. The experimental result showed that the off-state current of the p-channel polysilicon thin film transistor is dependent on the degree of radiation damage.
윤진영,임범수,Yoon, Jin-Young,Lim, Beom-Soo 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.6
If the flow of booster gas which is exhausted to the rear part of a canister is properly restricted in the canister of a hot-launch system, the resultant pressure built up in the canister provides additional force to accelerate the missile to a required launch velocity. These thrust augmentation performances can be controlled through the configuration design of baseplate orifices. In this paper, the simple technique to analyze the thrust augmentation performances of baseplate orifices is suggested and the thrust augmentation characteristics by its various configurations are compared. According to the initial displacement of a missile, the inner pressure of a canister is measured from scaled cold flow tests, and the discharge coefficient of baseplate orifices is calculated. Then the thrust augmentation in a canister is simulated by applying these discharge characteristics to the AMESIM software for launch dynamics.
윤진영 ( Jin Young Yoon ),김도경 ( Do Kyung Kim ),천재희 ( Jae Hee Cheon ),문창모 ( Chang Mo Moon ),박재준 ( Jae Jun Park ),정주원 ( Joo Won Chung ),김은영 ( Eun Young Kim ),김태훈 ( Tae Hoon Kim ),이찬주 ( Chan Joo Lee ),박은영 ( 대한장연구학회 2010 Intestinal Research Vol.8 No.1
Post-radiation soft tissue sarcomas are recognized as rare complications of radiation therapy. The most common type of post-radiation soft tissue sarcoma is a malignant fibrous histiocytoma (MFH), which originates from mesenchymal cells with a predominance of histiocytes and fibroblasts. The two most common sites of occurrence for post-radiation soft tissue sarcomas are the chest wall and pelvic cavity. Post-radiation colorectal MFHs are extremely rare and all of the reported cases of post-radiation sarcomas have occurred >3 years after radiation therapy. Recently, we managed a case of colorectal MFH which developed in a 48-year-old male who had undergone a low anterior resection for rectal adenocarcinoma and had received chemoradiotherapy as adjuvant treatment. Twelve months after radiotherapy, a 4 cm mass was detected 8 cm superior to the anastomosis site on colonoscopic examination. A soft tissue sarcoma was suspected on pathologic examination of the biopsy specimen. Therefore, he underwent a Hartmann’s operation and the final pathologic finding revealed MFH with a storiform pattern of tumor cells composed of pleomorphic, multinucleated giant cells. This is the first case of MFH that had a latency period <3 years (i.e., 1 year) between the time of radiotherapy and diagnosis. (Intest Res 2010;8:75-79)
윤진영 ( Jin Young Yoon ),차재명 ( Jae Myung Cha ),진윤태 ( Yoon Tae Jeen ) 대한소화기학회 2018 대한소화기학회지 Vol.71 No.1
Colonoscopy is currently regarded as the gold standard and preferred method of screening for colorectal cancer (CRC). However, the benefit of colonoscopy screening may be blunted by low participation rate in population-based screening program. Harmful effects of population-based colonoscopy screening may include complications induced by colonoscopy itself and by sedation, psychosocial distress, potential over-diagnosis and socioeconomic burden. In addition, harmful effect of colonoscopy may increase with age and comorbidity. As the adverse event risk in population-based colonoscopy screening may offset benefit of the screening colonoscopy, the adverse events associated with screening colonoscopy should be well managed and monitored. To adopt population-based colonoscopy screening, consensus for the risk and benefits of screening colonoscopy should be formed for its potential harms, patient preference, socioeconomic considerations, quality improvement of colonoscopy as well as its efficacy for CRC prevention. As the suboptimal colonoscopy quality is a major pitfall of population-based colonoscopy screening, adequate training and provider regulation for screening colonoscopists should be the first step to minimize the variation of quality between colonoscopists. Gastroenterologists should lead quality improvement, auditing, and training associated with colonoscopy in a population-based colonoscopy screening program. (Korean J Gastroenterol 2018;71:3-9)