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Kwangsik Jang,조현민,Kyung Mi Shim,김세은,강성수 한국임상수의학회 2022 한국임상수의학회지 Vol.39 No.2
A dog aged two years and seven months and a cat aged seven years were referred owing to fractures of long bones. Preoperative radiographs revealed comminuted bone fractures close to joints. Conventionally, long-bone fractures are treated using intramedullary pins, plate and screw systems, or an external fixator system. In cases of non-reducible fractures, various graft materials have been used in fracture treatments to stimulate bone repair. Here, recombinant human bone morphogenetic protein-2 (rhBMP-2) and a collagen membrane were applied. Four weeks after surgery, fractured bone fragments began to unite and the bone union was observed using radiography four months after surgery. No complications occurred related to grafted materials. We successfully applied rhBMP-2 and collagen membranes in two different species to support the healing process of comminuted fractures, according to the concept of guided bone regeneration.
Successful Surgical Treatment of Severe Lower Lip Avulsion in Two Cats
Kwangsik Jang,Yangwon Chae,Euisin Yang,조현민,Kyung Mi Shim,Chun-Sik Bae,강성수,김세은 한국임상수의학회 2022 한국임상수의학회지 Vol.39 No.5
Two Korean short-haired cats were admitted to the Veterinary Med- ical Teaching Hospital, Chonnam National University, with severe lower lip avulsion. In the first case, the treatment was performed using the tension-free suture technique with rubber tube stents. The second case was treated using the tension-free suture technique with rubber tube stents for lip avulsion and using the cerclage wiring technique for alveolar fracture. The teeth around the alveolar fracture were extracted and bone graft and collagen membrane were applied at the alveolar fracture site to stabilize the mandibular alveolar fracture. Thereafter, the cerclage wire was placed circumferentially around the mandible. In both cases, normal function of the oral cavity was successfully recovered by repairing the anatomic abnormality. In conclusion, tension-free suture technique can be a treatment option for bilateral lower lip avulsion in cats.
장원석(Wonseok Jang),김광식(Kwangsik Kim),정갑주(Karpjoo Jeong) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.1
오늘날 공학 분야에서 한 분야에서만 이뤄지던 연구가 다분야 통합 연구로 바뀌어 가고 있다. MDO(Multi-Disciplinary Optimization) 프레임워크는 각 분야의 설계 도구들 간의 데이터 공유 및 효율적 관리를 위한 기술과 여러 분야가 분산된 환경 하에서 병렬로 작업할 수 있는 컴퓨팅 환경을 말한다. 기존의 MDO 프레임워크는 여러 분야의 설계 도구들을 통합 관리하는 표준 인터페이스가 없고, 이것들의 작업 흐름을 자동으로 통합 관리할 환경이 없다는 문제점이 있다. 본 논문에서는 웹 서비스를 사용하여 각 설계도구 간의 표준 인터페이스를 제공하고, 워크플로우를 사용하여 이것들을 자동으로 통합 관리하는 웹 서비스 기반 통합 설계 프레임워크를 구현한다.
Ryu, Jichul,Jang, Won Seok,Kim, Jonggun,Lee, Gwanjae,Yoon, Kwangsik,Kim, Yong Seok,Lim, Kyoung Jae IWA PUBLISHING 2018 WATER SCIENCE AND TECHNOLOGY -WATER SUPPLY- Vol.18 No.4
<P>The Long-term Hydrologic Impact Assessment Model with Asymptotic Curve Number Regression Equation and Water Quality model (L-THIA ACN-WQ) has been developed to simulate streamflow as well as instream water quality using fewer parameters, compared to other watershed models. However, since model input parameters (i.e. hydraulic response unit (HRU) map, stream network, database (DB), etc.) should be built by user manually, it is difficult to use the model for a nonprofessional or environmental policy decision-maker. In addition, it is difficult to analyze model outputs in time and space because the model does not provide geographic information system (GIS) information for the simulation results. To overcome the limitations, an advanced version of L-THIA ACN-WQ system which is based on ArcGIS interface was developed in this study. To evaluate the applicability of the developed system, it was applied to the Banbyeon A watershed in which total maximum daily load (TMDL) has been implemented. The required model input datasets were automatically collected in the system, and stream flow, T-N and T-P pollutant loads were simulated for the watershed. Furthermore, flow duration curve (FDC) and load duration curve (LDC) were generated to analyze hot spot areas in the system through automatic processes included in the system. The system can establish the model input data easily, automatically provide the graphs of FDC and LDC, and provide hot spot areas which indicate high pollutant loads. Therefore, this system can be useful in establishing various watershed management plans.</P>
Yangwon Chae,Kwangsik Jang,Yesol Jo,Shamshik Shin,Sohi Kang,SeEun Kim,Kyung Mi Shim,Seong Soo Kang 한국실험동물학회 2021 한국실험동물학회 학술발표대회 논문집 Vol.2021 No.7
Introduction Radio frequency technology has been developed as a noninvasive method to reduce subcutaneous fat. This study aimed to measure the safety and effectiveness of the radiofrequency fat reduction system (RF system). We evaluated the efficiency of heat transfer to the subcutaneous layer by using ex vivo model. And then, we tried to verify the safety of the RF system by measuring skin surface temperature changes and the effectiveness by evaluating histological changes in subcutaneous lipocytes in pigs. Materials & Methods The RF system was developed and manufactured by PolyBioTech co., Ltd., Gwangju, Republic of Korea. In ex vivo model, fresh pork containing skin, subcutaneous, and muscle layer was treated with the RF system at 43℃ or 40℃ for 15 minutes. The temperature changes in the cut section of the pork were measured during treatment. In in vivo model, a dorsal skin of pig was also treated with the RF system at 45℃ for 30 minutes. The skin surface temperature of the pig was measured before and after treatment. Moreover, the treated sites were biopsied and evaluated histologically immediately, 1 day, and 7 days after treatment. Results In ex vivo model, the skin surface temperature of the pork did not exceed the set temperature value for most of the treatment time. And as the treatment time progressed, the heat gradually transferred to the deep layer. In in vivo model, the skin surface temperature of the pig remained below the set for the entire treatment time. In histological evaluation, no skin damage was observed and the sizes of subcutaneous lipocytes in pigs had shrunken by 27.87% immediately after, 30.83% 1 day after, and 34.81% 7 days after treatment. Conclusion The RF system used in this study effectively reduced subcutaneous fat without side effects such as skin damage. Based on this, it is expected that safe and effective use of this system will be possible for non-invasive fat reduction.
APEX 모형을 이용한 유기농경지에서의 질소 부하량 저감을 위한 지표피복 효과
소현철 ( So Hyunchul ),장태일 ( Jang Taeil ),김동현 ( Kim Dong-hyeon ),설동문 ( Seol Dong-mun ),윤광식 ( Yoon Kwangsik ) 한국농공학회 2018 한국농공학회논문집 Vol.60 No.5
The objectives of this study were to monitor organic farming upland compared with conventional upland field and to evaluate nutrient loads reduction of surface cover effect with long-term historical climate data. APEX(Agricultural Policy Environmental eXtender) model was validated with experimental data and used for assessing surface cover scenarios for 30-year simulation periods. The validated values of RMSE(Root Mean Square Error), RMAE(Root Mean Absolute Error), R2 and E(Nash-Sutcliffe efficiency) for runoff were 1.17-1.37 mm/day, 0.28-0.45 mm/day, 0.88-0.90 and 0.82-0.94 in two treatments, respectively. Those for water quality (nitrogen) were 0.05-0.16 kg/ha, 0.52-0.75 kg/ha, 0.67-0.72 and 0.32-0.70 in two treatments, respectively, and therefore the validated model showed good agreement with the observed runoff and nitrogen load for the study period. When decreasing the surface cover rate of organic farming field to 75%, 50%, 25%, and 0% (conventional field), average annual runoff increased by 7%, 15%, 23% and 31%, respectively. Under same condition of decreasing the surface cover rate, average annual nitrogen loads increased by 1.4 times, 1.7 times, 2.0 times, and 2.3 times compared with organic farming field, respectively. This study showed that it is possible to present an appropriate surface cover ratio to maintain conventional production and minimize nonpoint sources pollution for organic farming system, although long-term monitoring is needed to determine its effects on environmental concerns, crop competition, and other uncertainty.
Evaluation of Porcine Hybrid Bone Block for Bone Grafting in Dentistry
KIM, SE EUN,LEE, EUNSEOK,JANG, KWANGSIK,SHIM, KYUNG MI,KANG, SEONG SOO ANTICANCER RESEARCH 2018 IN VIVO -ATHENS- Vol.32 No.6
<P> Background/Aim: The purpose of this study was to develop hybrid bone blocks using porcine-derived collagen and low crystalline porcine-derived hydroxyapatite to overcome the disadvantages of commonly used bone grafts in dentistry. Materials and Methods: Collagen was added to hydroxyapatite particles to increase the spatial integration of particulate bone grafts. Physicochemical examination and in vivo tests were performed to analyze scaffold’s characteristics and evaluate bone regeneration. Results: Porcine hybrid bone block had an irregular and interconnecting macroporous structure that was adequate for bone regeneration and bone ingrowth, and showed a good space-occupying ability to become well positioned. In addition, it showed higher angiogenesis and biodegradability than Bio-Oss Collagen<SUP>®</SUP>, a commercialized bone graft used in dental clinics. Conclusion: Our results suggest that improved collagen hybrid bone block can be generated when porcine cancellous bone particles and collagen were reasonably mixed. This hybrid bone block was easy in handling had flexibility, good biodegradability and provided bone regeneration. </P>
이민호(Lee, Minho),김성우(Kim, Sungwoo),김정환(Kim, Jeonghwan),김기호(Kim, Kiho),정충섭(Jung, Choongsub),노경완(Rho, Kyungwan),장광식(Jang, Kwangsik) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
The fuel economy estimates essentially serve two purposes : to provide consumers with a basis on which to compare the fuel economy of different vehicles, and to provide consumers with a reasonable estimate of the range of fuel economy they can expect to achieve. The current fuel economy label values utilize measured fuel economy over city driving cycles. However, this test driving mode can not be evaluated the variety factor of the real-world. These factors include differences between the way vehicles are driven on the road and over the test cycles, air conditioning use, widely varying ambient temperature and humidity, widely varying trip lengths, wind, precipitation, rough road conditions, hills, etc. The purpose of this paper is to account for three of these factors on the fuel economy : 1) on-road driving patterns (i.e. higher speeds and more aggressive driving (higher acceleration rates)), 2) air conditioning, and 3) colder temperatures. The new test methods will bring into the fuel economy estimates the test results from the five emissions tests in place today : CVS-75, HWFET, US06, SC03 and Cold CVS-75. Based on these new test methods, this paper discusses the characteristics of driving condition on Hybrid electric vehicle (HEV). And this paper assesses the fuel economy label of HEV.