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허성우,김석중,김영주,최남용,전영준,박인주,Asode Ananthram Shetty 한국조직공학과 재생의학회 2014 조직공학과 재생의학 Vol.11 No.2
Recently, many clinical studies have been published regarding platelet-rich plasma (PRP) injection for early degenerative joint disease. We evaluated the cartilage repair potential of platelet-rich plasma when injected into the knee joint. Articular, cartilage defects 4mm in diameter and circular in shape were made in the trochlear region of 20 knees in 10 New Zealand white rabbits who were divided into two groups. The left knees in the control group underwent microfracture, and the right knees in the experimental group underwent microfracture with subsequent injection of platelet-rich plasma. At week 12 following the surgery, the cartilage was observed macroscopically and histologically compared in the two groups. The control group showed incomplete and irregular fibrous tissue formation in the defect. The experimental group showed nearly complete defect coverage with neo-cartilage. In the histologic scoring, comparison of the control group and the experimental group differed significantly (p<0.05).Therefore, injection of platelet-rich plasma used to treat articular cartilage defects of the knee appears to have some effect forcartilage regeneration.
허성우 동아대학교 공과대학 부설 한국자원개발연구소 1987 硏究報告 Vol.11 No.2
This study investigated three algorithms in terms of both computing times and storage requirements for 0/1 knapsack problems. These algorithms use different methods, one uses dynamic programming method, another uses backtracking method and the other uses least cost branch- and-bound method. Theoretical analysis shows that these algorithms have the same complexity. But empirical results indicate that the least cost branch- and-bound algorithm to be generally superior to the others and the backtracking algorithm is highly faster than the dynamic algorithm. Also empirical result show how the computing time required by these algorithms varied with changes in the profits and weights and also with change in the number of objects.
허성우 이화여자대학교 아시아여성학센터 2013 Asian Journal of Women's Studies(AJWS) Vol.19 No.3
This paper attempts to expand the political spaces of South Korean feminist politics of reproduction, which demands women’s biological reproductive rights from the state in the context of the developmental hegemony of Korean society. The case study of SMCs (Saemaul Mothers’ Clubs) shows that a long, deep, and continuous mobilization of women’s biological reproduction has been undertaken by the state within the frame of economic and socio-political development. In this process women have embodied developmentalism, creating strong consent for the associated state-led development policies. The feminist politics of reproduction calls for a shift from the politics of women’s biological reproductive rights with a strategy for engaging with the state in a struggle to deconstruct the developmental hegemony of reproduction that is simultaneously entrenched in people’s bodies, sexuality, mindsets, behavior patterns and in civil society groups, state institutions, and economic sectors at local, national, and global levels.
허성우,배재호,송주현,이주엽,Huh, Sung-Woo,Bae, Jae-Ho,Song, Joo-Hyoun,Lee, Joo-Yup 대한미세수술학회 2012 Archives of reconstructive microsurgery Vol.21 No.2
Purpose: To report the clinical results of the perforated-based propeller flap for lower extremity soft tissue reconstruction. Materials and Methods: Between January 2010 and June 2012, a total of 16 defects in the lower extremities were covered with perforator-based propeller flaps. Retrospective data for location and size of the defect, flap dimension, pedicle artery, pedicle rotation, complications were obtained. Results: Peroneal artery-based perforator flap were used in eleven cases, posterior tibial artery-based perforator flap in two cases, anterior tibial artery-based perforator flap in one case and medial plantar artery-based perforator flap in two cases. The average size of the flaps was $63cm^2$. The marginal skin necrosis of the flaps as a complication was developed in two cases, one of which was covered with split-thickness skin graft. There were no functional deficits from the donor site. Conclusion: For the reconstruction of lower extremities, the perforator-based propeller flap could be a reasonable alternative as it is a simple, safe and versatile technique.
허성우,오은경 한국정보과학회 2003 정보과학회논문지 : 시스템 및 이론 Vol.30 No.10
This paper presents an efficient hybrid techniques for a standard cell placement. The prototype tool adopts a middle-down methodology in which an n×m grid is imposed over the layout area and cells are assigned to bins forming a global placement. The optimization technique applied in this phase is based on the Relaxation-Based Local Search (RBLS) framework [12] in which a combinatorial search mechanism is driven by an analytical engine. This enables a more global view of the problem and results in complex modifications of the placement in a single search "move." Details of this approach including a novel placement legalization procedure are presented. When a global placement converges, a detailed placement is formed and further optimized by the optimal interleaving technique[13]. Experimental results on MCNC benchmarking circuits are presented and compared with the Feng Shui's results in [14]. Solution qualities are almost the same as the Feng Shui's results. 본 논문은 표준 셀을 효율적으로 배치하는 하이브리드 기법을 제시한다. 제시한 기법에서는 레이아웃 영역을 n×m 그리드로 분할하고, 분할된 그리드의 각 빈에 셀을 배치함으로 광역 배치를 얻는다. 광역배치를 얻은 후 Relaxation-Based Local Search (RBLS)라 불리는 해석적 최적 기법[12]을 사용하여 배치를 개선시킨다. 이 기법을 사용하면 배치 전체를 개괄적으로 볼 수 있게 되어 배치가 국부 최적에 빠지지 않도록 할 수 있다. 이 기법의 핵심은 중복을 해결하기 위한 매우 효율적인 적법화 알고리즘이라고 볼 수 있는데, 이에 대해 본 논문은 자세히 설명한다. 광역배치가 더 이상 개선되지 않으면 이를 상세 배치로 변환시킨다. 상세 배치를 얻은 후 “최적 인터리빙”이라 불리는 기법[13]을 사용하여 이를 더욱 개선시킨다. MCNC 벤치마킹 회로에 대한 실험 결과는 [14]에서 보여준 Feng Shui의 결과와 필적할 만하다.
허성우,Asode Ananthram Shetty,김장묵,조미라,김선애,양시영,김영주,Palaksha Kanive Javaregowda,최남용,강진,김석중 한국조직공학과 재생의학회 2016 조직공학과 재생의학 Vol.13 No.2
Healthy and high quality of life has become the main issue with increasing human life span. Many biological treatments for osteoarthritis of the knee have been tried with limited success. We compared data from 7 patients who underwent total knee arthroplasty and 46 patients who underwent autologous bone-marrow mesenchymal cell induced chondrogenesis (MCIC) for osteoarthritis of grade IV of the Kellgren-Lawrence classification and grade IV of modified Outerbridge classification from 50 to 65 years of age. Clinical evaluation of the 2 groups showed significant improvement in the mean telephone Knee Society Scoring system (tKSS)-A (pain) and tKSS-B (function) scores throughout the postoperative follow-up period. There was no difference in the patients’ satisfaction between the 2 groups. MCIC is a treatment option at least for delaying disease progression of osteoarthritis of the knee.
차량의 횡방향 각속도를 고려한 실시간 장애물 회피 동작계획
허성우,박태형 제어·로봇·시스템학회 2019 제어·로봇·시스템학회 논문지 Vol.25 No.2
This paper proposes a method for motion planning of a vehicle considering lateral angular velocity constraints. Motion planning is very important for the safe travel of an autonomous vehicle. In this work, the steering angle of the vehicle is included in the cost function in order to achieve smooth operation of the vehicle. and path optimization uses dynamic programming to select the paths that satisfy the constraint with the least cost. After selecting the optimal path, the longitudinal velocity profile is determined using a fuzzy speed controller. The steering input of the vehicle and the distance from the obstacle to follow the path are used as the input of the fuzzy speed controller, and the controller provides longitudinal acceleration and deceleration of the vehicle as the output. Experiments were conducted for three scenarios using vehicles equipped with Lidar, IMU, GPS, and cameras. Experimental results show that the proposed motion plan generates a path within the steering constraint condition of the vehicle and runs effectively.