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나노임프린트 리소그래피를 위한 스케일 다운된 산화막 스탬프 제작과 패턴결함 개선에 관한 연구
박형석,최우범,성만영,Park, Hyung-Seok,Choi, Woo-Beom,Sung, Man-Young 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.2
We have investigated pattern scaling down of silicon stamps through the oxidation technique, During oxidizing the silicon stamps, silicon dioxide that has 300 nm and 500 nm thickness was grown, and critical deformations were not observed in the patterns. There was positive effect to reduce size of patterns because vertical and horizontal patterns have different orientation. We achieved pattern reduction rate of $26\%$. In addition, the formation of polymer patterns had been investigated with varied temperature and pressure conditions to improve the filling characteristics of polymers during nanoimprint lithography when pattern sizes were few micrometers. In these varied conditions, polymers had been affected by free space compensation and elastic stress relaxation for filling the cavities. Based on the results, defect control which is an important issue in the nanoimprint lithography were facilitated.
중증 무지외반증에서 원위 중족골 갈매기 절골술과 근위 중족골 갈매기 절골술의 결과 비교
박형석,이준영,고강열,류제홍,임재환,Park, Hyung Seok,Lee, Jun Young,Ko, Kang Yeol,Ryu, Jehong,Lim, Jae Hwan 대한족부족관절학회 2020 대한족부족관절학회지 Vol.24 No.4
Purpose: This study compared the results of proximal and distal chevron osteotomy in patients with severe hallux valgus. Several recent studies have shown that the indications for distal metatarsal osteotomy with a distal soft-tissue procedure could be extended to include severe hallux valgus. Materials and Methods: This study analyzed 127 severe hallux valgus surgeries. Of these, 76 patients (76 feet) were excluded for lack of adequate follow-up and additional procedures (Akin procedure), leaving 51 patients (51 feet) in the study. The mean age of the patients was 58 years (21~83 years), and the mean follow-up duration was 18 months (12~32 months). The patients were divided into two groups. Group 1 underwent distal chevron osteotomy, and group 2 underwent proximal chevron osteotomy performed sequentially by a single surgeon. The patients were interviewed for the American Orthopaedic Foot and Ankle Society (AOFAS) score before and one year after surgery. The anteroposterior weight-bearing radiography of the foot was taken before and one year after surgery. Results: There were no significant differences in pain and function after one year in either group. Both groups experienced significant pain reduction and an increase in the AOFAS score. Significant improvement of the hallux valgus and intermetatarsal angle corrections was observed in both groups, and the sesamoid position was similar in each group. More improvement in radiographic correction of intermetatarsal angle was noted in group 2. Both procedures gave similar good clinical and radiological outcomes. Conclusion: This study suggests that a distal chevron osteotomy with a distal soft-tissue procedure is as effective and reliable a means of correcting severe hallux valgus as a proximal chevron osteotomy with a distal soft-tissue procedure.
북한강 수계 대규모 탁수사상 발생에 의한 댐 저수지의 탁수 영향 분석
박형석 ( Hyung-seok Park ),정세응 ( Se-woong Chung ),정선아 ( Sun-a Choung ) 한국물환경학회 2017 한국물환경학회지 Vol.33 No.3
Persistent turbidity is defined as the long-term resuspension of small particles. It is one of the most important water qualities of the dam reservoir systems located in North Han River. Persistent turbidity results in aesthetic nuisance and harmful effect on the health of the ecosystem, in addition to elevated costs for water treatment for supplying drinking water supply to the Seoul metropolitan area. These harmful effects have been intensified with increasing strength and frequency of rainfall due to climatic changes in the basin. This study analyzed the effect of an extreme turbidity flow event that occurred in 2006, on the serial reservoir system (Soyang-Uiam-Cheongpyung-Paldang) located on the North Han River. The CE-QUAL-W2 model was set up and calibrated for the river and reservoir system, using the field data obtained in 2006 and 2007. The results showed that for 334 days, turbid water was released by the Soyang Reservoir, which was classified as having TSS concentration greater than 25 mg/L with peak TSS of 264.1 mg/L, after the extreme flood (592.7 mm) that occurred between 10th-18th July, 2006. The turbid water released by the Soyang Reservoir reached the most downstream Paldang Reservoir after about 20 days, and was sustained for 41 days, which was validated with water treatment plant data. Since the released water from Soyang Reservoir had low water temperature and high TSS, an underflow formed in the downstream reservoirs and vertically mixed at Paldang Reservoir due to dilution by sufficient inflow from the South Han River.
박형석 ( Hyung Seok Park ) 대한소화기기능성질환·운동학회 2004 Journal of Neurogastroenterology and Motility (JNM Vol.10 No.2
요약: 과민성 장 증후군을 가진 환자는 정상인보다 높은 수술 빈도를 보인다. 저자들은 건강 검진을 받은 사람을 대상으로 하여 과민성 장 증후군을 포함한 여러 독립적인 수술의 요인을 살펴보았다. 89,008명을 대상으로 독립적 요소에 대한 다단계 로기스틱 회귀 분석을 시행하여 6종의 수술 빈도에 대한 인자를 분석하였다. 설문지와 의무 기록만으로 과민성 장 증후군의 진단이 가능한지를 알기 위해 3년 이상의 기록을 가진 과민성 장 증후군 환자 201명과 그들
박형석 ( Hyung Seok Park ),정세웅 ( Se Woong Chung ),윤성완 ( Sung Wan Yoon ),류인구 ( In Gu Ryu ) 한국물환경학회 2011 한국물환경학회지 Vol.27 No.6
One of the most important water management issues of Soyang Reservoir, located in North Han River in Korea, is a long term discharge of turbid water to downstream during flood season. Installation of a selective withdrawal structure (SWS) is planned by the reservoir management institute as a control measure of outflow water quality and associated negative impacts on downstream water use and ecosystem. The objective of the study was to explore the effectiveness of the SWS on the control of outflow turbidity under two different hydrological years; one for normal flood year and another for extreme flood year. A two-dimensional (2D), laterally averaged hydrodynamic and water quality model (CE-QUAL-W2) was set up and calibrated for the reservoir and used to evaluate the performance of the proposed SWS. The results revealed that the SWS can be an effective method when the θ value, the ratio between the amount of turbid water that containing suspended sediment (SS) greater than 25 mg/L and the total storage of the reservoir, is 0.59 during the normal flood year. However, the effectiveness of the SWS could be marginal or negative in the extreme flood year when θ was 0.83. The results imply that the SWS is an effective alternative for the control of turbid water for moderate flood events, but not a sufficient measure for large flood events that are expected to happen more often in the future because of climate change.
불투수면 저감기법의 유출량 및 오염부하량 저감 효과 분석
박형석 ( Hyung Seok Park ),최환규 ( Hwan Gyu Cho ),정세웅 ( Se Woong Chung ) 한국환경영향평가학회 2015 환경영향평가 Vol.24 No.1
Impervious covers(IC) are artificial structures, such as driveways, sidewalks, building’s roofs, and parking lots, through which water cannot infiltrate into the soil. IC is an environmental concern because the pavement materials seal the soil surface, decreasing rainwater infiltration and natural groundwater recharge, and consequently disturb the hydrological cycle in a watershed. Increase of IC in a watershed can cause more frequent flooding, higher flood peaks, groundwater drawdown, dry river, and decline of water quality and ecosystem health. There has been an increased public interest in the institutional adoption of LID(Low Impact Development) and GI(Green Infrastructure) techniques to address the adverse impact of IC. The ohjectives of this study were to construct the modeling site for a samll urban watershed with the Storm Water Management Model(SWMM), and to evaluate the effect of various LID techniques on the control of rainfall runoff processes and non-point pollutant load. The model was calibrated and validated using the field data collected during two flood events on July 17 and August 11, 2009, respectively, and applied to a complex area, where is consist of apartments, school, roads, park, etc. The LID techniques applied to the impervious area were decentralized rainwater management measures such as pervious cover and green roof. The results showed that the increase of perviousness land cover through LID applications decreases the runoff volume and pollutants loading during flood events. In particular, applications of pervious pavement for parking lots and sidewalk, green roof, and their combinations reduced the total volume of runoff by 15~61 % and non-point pollutant loads by TSS 22~72 %, BOD 23~71 %, COD 22~71 %, TN 15~79 %, TP 9~64 % in the study site.