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펄스레이저 증착법에 의해 성장된 ZnO 박막의 특성 관찰
최재완,지현진,정창욱,이보화,김규태,Choi, Jae-wan,Ji, Hyun-jin,Jung, Chang-Uk,Lee, Bo-Hwa,Kim, Gyu-Tae 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.2
The semiconducting material of ZnO in II-VI group was well known as its good application for photo electronics, chemical sensors and field effect transistors due to the remarkable optical properties with wide energy band gap and great ionic reactivities. Up to now the growth of a good quality of ZnO film has been issued for better performances. Even though there were many deposition methods for making ZnO films, pulse laser deposition methods have been preferred for high crystalline films. In this report, the ZnO film was also created by pulsed laser deposition technique which also showed high crystalinity. By controlling several factors when deposited, it was investigated that the optimal condition for ZnO film formation. Mainly, oxygen partial pressures and growth temperatures were changed when ZnO films were synthesized and followed the characterization by HRXRD and AFM.
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다양한 강우강도 및 패턴에 따른 WEPP 모형의 유출‧첨두유출‧토양유실량 평가
최재완,류지철,김익재,임경재,Choi, Jae-Wan,Ryu, Ji-Chul,Kim, Ik-Jae,Lim, Kyoung-Jae 한국수자원학회 2012 한국수자원학회논문집 Vol.45 No.8
Recently, changes in rainfall intensity and patterns have been causing increasing soil loss worldwide. As a result, the water ecosystem becomes worse and crops yield are reduced with soil loss and nutrient loss with it. Many studies have been proposed to estimate runoff and soil loss to predict or decrease non-point source pollution. Although the USLE has been used for many years in estimating soil losses, the USLE cannot reflect effects on soil loss of changes in rainfall intensity and patterns. The WEPP, physically based model, is capable of predicting soil loss and runoff using various rainfall intensity. In this study, the WEPP model was simulated for sediment yield, runoff and peak runoff using data of 5, 10, 30, 60 minute term rainfall, Huff's method and design rainfall. In case of rainfall interval of 5 minutes and 60 minutes, the sediment and runoff values decreased by 24% and 19%, respectively. The peak rate runoff values decreased by 16% when rainfall interval changed from 5 minutes to 60 minutes, indicating the peak rate runoff values are affected by rainfall intensity to some degrees. As a result of simulating using Huff's method, all values (sediment yield, runoff, peak runoff) were found to be the greatest at third quartile. According to the analysis under various design rainfall conditions (2, 3, 5, 10, 20, 30, 50, 100, 200, 300 years frequency), sediment yield, runoff, and peak runoff of 906.2%, 249.4% and 183.9% were estimated using 2 year to 300 year frequency rainfall data.
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대사증후군에 대한 사상체질별 허리둘레 및 체질량지수의 절단값에 대한 연구
최재완,유준상,Choi, Jae-Wan,Yu, Jun-Sang 사상체질의학회 2014 사상체질의학회지 Vol.26 No.4
Objectives This study was performed to investigate the cut-off values of abdominal circumference and Body Mass Index(BMI) according to Sasang Constitution. Methods A total of 1,773 persons, namely 440 male people and 1,333 female people, in ages from 40 to 69 years old, participated in this research. They are all included in the community based Genomic cohort in Wonju in years from 2006 to 2013. The diagnostic criteria of metabolic syndrome was used followed by the National Cholesterol Education Program in Adult Treatment Panel III (NCEP ATP III) and Asian pacific guideline for only abdominal obesity. Results The prevalence of metabolic syndrome was 34.8% for men and 37.6% for women in this research. Taeeumin was the highly significant risk type for the metabolic syndrome in both sexes. Cut-off values of abdominal circumference were 88.3 cm in men, 80.3 cm in women, and cut-off values of BMI were $24.2kg/m^2$ in men and $25.3kg/m^2$ in women. For men, cut-off values of abdominal circumference were 79.5cm in Soyangin, 88.8 cm in Taeeumin and 79.5 cm in Soeumin, and cut-off values of BMI were $23.2kg/m^2$ in Soyangin, $25.6kg/m^2$ in Taeeumin and $20.6kg/m^2$ in Soeumin. For women, cut-off values of abdominal circumference were 76.3 cm in Soyangin, 80.3 cm in Taeeumin and 76.8 cm in Soeumin, and cut-off values of BMI were $22.4kg/m^2$ in Soyangin, $24.9kg/m^2$ in Taeeumin and $21.3kg/m^2$ in Soeumin. Conclusions Although 90 cm in men, 80 cm in women as an Asian pacific guideline were regarded as quite approximate to the mean value of abdominal circumference and $25kg/m^2$ to BMI. But if the results could be allocated in terms of the Sasang constitutional method, the cut-off values for Soyangin and Soeumin should be lowered than now.
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사상체질음성분석기(四象體質音聲分析機)(PSSC)를 통한 한국인 성인남성(成人男性)의 체질별(體質別) 음향특성연구(音響特性硏究) - 단문(短文)을 중심으로 -
최재완,송학수,한동윤,조성언,왕향란,전종원,김달래,유준상,Choi, Jae-Wan,Song, Hak-Soo,Han, Dong-Youn,Cho, Sung-Eon,Wang, Hyang-Lan,Jeon, Jong-Weon,Kim, Dal-Rae,Yoo, Jun-Sang 사상체질의학회 2006 사상체질의학회지 Vol.18 No.3
1. Objectives and Methods A Study on the Characteristics of the Korean Adult Male Sound according to Sasang Constitution using PSSC with a Sentence. Sasang Constitutional Medicine(SCM) is the one of the traditional Korean Medicine. It classifies people into four categories like Taeyangin, Soyangin, Taeumin and Soeumin. The rule to classify is Appearance and Body Shape, Facial Appearance and Speech, Character and Talents and Diseases and Medications. This study was done to investigate the relationships between Voice and Sound parameters using PSSC(Phonetic System of Sasang Constitution) in a sentence. Experimental Participants were 195 Korean adult males including 1 Taeyangin, 37 Soyangin, 105 Taeumin and 52 Soeumin. Sasang Constitutional specialist used PSSC and Korean Medical Diagnosis to classify participants into four constitution. 2. Results In Pitch segment, Soyangin's Center freq.(4) was significantly high compared with Taeyangin and Taeumin groups. Soyangin's and Soeumin's Center freq.(6) was significantly high compared with Taeyangin and Taeumin groups. In APQ segment and Octave segment, there were no significant differences among four groups. In Shimmer segment, Taeumin's F Shimmer(1) and F Shimmer(2) were significantly high compared with Taeyangin and Soyangin groups. In Energy segment, Taeyangin's 2k-4k total sum, 2k-4k dev., C dev., C# dev. and D S.D. were significantly high compared with other groups. In Recording time segment, there was no significant difference among four groups. More Taeyangin cases and the other parameters are needed to determine constitution using PSSC and to make PSSC effective. 3. Conclusions From above result, there is the possibility of efficiency standard guide for constitution diagnosis by analyzation og voice.
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섬유주절제술 후 생체 분해성 콜라겐 기질의 섬유성 피막형성 1예
홍소진, 이종락, 김연덕, 최진영, 최재완Sojin Hong MD Jong Rak Lee MD Yeon-Deok Kim MD Jin Young Choi MD Jaewan Choi MD PhD 대한안과학회 2010 대한안과학회지 Vol.51 No.4
Purpose: Recently, biodegradable collagen matrix has been used as a possible substitute for anti-metabolite in trabeculectomy in order to control the responsiveness of the wound healing process. This paper reports a case of encapsulation of the biodegradable collagen matrix after trabeculectomy. Case summary: We conducted a fornix-based trabeculectomy on a 58-year-old man with medically uncontrollable steroid-induced glaucoma. We implanted biodegradable collagen matrix onto the sclera flap beneath the conjunctiva. Immediately after the surgery, we observed a localized bleb with high elevation. In the three months of follow-up, the bleb became encapsulated, and an increase in intraocular pressure was noted. During the wound revision, encapsulated material surrounded by thick fibrous membrane was found and removed from the subconjunctival space, followed by biopsy. Biopsy results demonstrated that amorphous collagenous material was surrounded by spindle and inflammatory cells. Conclusions: It is important to note that the fibrous encapsulation of collagen material is a possible complication of biodegradable collagen matrix-augmented trabeculectomy. J Korean Ophthalmol Soc 2010;51(4):631-635
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최재완 ( Jaewan Choi ),이성준 ( Sung Jun Lee ),천세억 ( Se Uk Cheon ),임경재 ( Kyung Jae Lim ) 한국농공학회 2011 한국농공학회 학술대회초록집 Vol.2011 No.-
골프산업은 매년 증가추세에 있으며, 이에 따라 국내 골프장 수도 늘어나고 있다. 골프장은 비료사용으로 인한 유기 화합물의 유출로 수생태계에 악영향을 미칠 수 있는데, 이는 주로 강우유출수로부터 발생된다. 환경적 측면 뿐만이 아니라, 골프장은 저류지를 이용하여 강우유출수를 한 곳으로 모아 잔디의 관수로 사용되므로 골프장 운영 측면에서도 강우유출 특성을 파악하는 것이 중요하다. 따라서 본 연구에서는 WEPP 모형을 이용하여 골프장 잔디성장을 고려한 강우유출수 특성을 평가하였으며, 예초 및 관수에 따른 잔디성장과 강우유출수 예측을 통하여 골프장에서 발생하는 유출특성 및 골프장 운영에 대한 기초자료를 제시하고자 한다. WEPP 모형의 유출 정확성 평가 결과 보정시 %diff.는 1.15%, NSE는 0.92, R2는 0.93으로 산정되었고, 검증시 %diff.는 18.12%, NSE는 0.82, R2는 0.88로 산정되었다. 따라서 WEPP 모형이 골프장에서 발생하는 강우유출수를 정확히 예측할 수 있는 것으로 판단되었다. 예초 유ㆍ무에 따른 유출량 예측결과 총 2774.5m3이 차이나는 것으로 나타났으며, 이는 예초를 한 경우보다 예초를 안한 경우에 27% 유출이 감소하는 것이다. WEPP 모형을 이용하여 관수에 따른 골프장 잔디의 생육과 유출특성을 비교한 결과 관수를 하는 경우 잔디의 생육을 촉진시키는 것으로 나타났다. 관수 유ㆍ무에 따른 유출량은 총 11.8% 차이가 나는 것으로 나타났으며, 가장 차이가 많이 나는 경우 27.4% 정도로 나타났다. 강우유출수는 골프장에서 사용하는 물의 상당부분을 차지하고 있으므로 관수량을 적절히 조절하여 골프장을 효율적으로 운영할 수 있을 것으로 판단된다.
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