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공기식 태양광/열 집열기 내 공기층에서 비균일 단면을 갖는 돌출부 설치 조건에 따른 전열 성능에 관한 분석
문광암(Moon Kwang-Am),최휘웅(Choi Hwi-Ung),김영복(Kim Young-Bok),손창효(Son Chang-Hyo),윤정인(Yoon Jung-In),최광환(Choi Kwang-Hwan) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.1
Air-type photovoltaic/thermal (PV/T) collectors attached to ducts beneath the solar panels are devices that can recover heat while the panel cools. By contrast, water-type PV/T is easily used because the air of an air-type PV/T has a lower heat capacity than water. A number of studies have been conducted on the installation of ribs as a way to increase the heat recovery capacity of air through ducts. In this study, a protrusion with a non-uniform cross-section was selected to increase the contact area of the air side as well as to promote turbulence. A computational fluid dynamics (CFD) analysis was conducted to confirm the heat transfer performance and the characteristics of the pressure drop according to different shape conditions. As a result, the heat transfer performance was improved by 1.3- to 1.9-fold depending on the conditions of the protrusion installation. However, the pressure drops also increased from 2.534- to 4.685-fold. It is therefore necessary to identify those factors of the thermal hydraulic performance that consider both the heat transfer and pressure drop. As a result, the maximum heat-recoverable shape condition achieved the largest performance coefficient value of 1.24 when e/H = 0.16, P/e = 20, and Wp/e = 5.
( Kwang Duck Ryu ),( Gwang Ha Kim ),( Seong Oh Park ),( Kwang Jae Lee ),( Jung Youn Moon ),( Hye Kyung Jeon ),( Dong Hoon Baek ),( Bong Eun Lee ),( Geun Am Song ) 대한소화기학회 2014 Gut and Liver Vol.8 No.4
Background/Aims: Helicobacter pylori eradication therapy has been used as a first-line treatment for H. pylori-positive gastric mucosa-associated lymphoid tissue (MALT) lymphoma. However, the management strategy for H. pylori-negative MALT lymphoma remains controversial. Therefore, the aim of this study was to examine the success rate of each treatment option for H. pylori-positive and H. pylori-negative gastric MALT lymphomas. Methods: In total, 57 patients with gastric MALT lymphoma diagnosed between December 2000 and June 2012 were enrolled in the study. The treatment responses were compared between H. pylori-positive and H. pylori-negative gastric MALT lymphomas. Results: Of the 57 patients, 43 (75%) had H. pylori infection. Forty-eight patients received H. pylori eradication as a first-line treatment, and complete remission was achieved in 31 of the 39 patients (80%) with H. pylori-positive MALT lymphoma and in five (56%) of the nine patients with H. pylori-negative MALT lymphoma; no significant difference was observed between the groups (p=0.135). The other treatment modalities, including radiation therapy, chemotherapy, and surgery, were effective irrespective of H. pylori infection status, with no significant difference in the treatment response between H. pylori-positive and H. pylori-negative MALT lymphomas. Conclusions: H. pylori eradication therapy may be considered as a first-line treatment regardless of H. pylori infection status. (Gut Liver 2014;8:408-414)
엄중섭 ( Jung Seop Eom ),김광하 ( Gwang Ha Kim ),송근암 ( Geun Am Song ),백동훈 ( Dong Hoon Baek ),류광덕 ( Kwang Duck Ryu ),이경남 ( Kyung Nam Lee ),박도윤 ( Do Youn Park ) 대한소화기학회 2011 대한소화기학회지 Vol.58 No.6
Duplication cysts are uncommon congenital malformations that may occur anywhere throughout the alimentary tract. The stomach is an extremely rare site of occurrence. Here, we report a case of gastric duplication cyst initially presenting with a gastric submucosal tumor. A 28-year-old man complained of dyspepsia lasting 1 year and upper endoscopy revealed an ellipsoid submucosal tumor at the greater curvature of the antrum. We intended to use the injection-and-cut technique: however, after saline injection, the lesion was dented and impossible to grasp with a snare. Therefore, we decided to perform endoscopic submucosal dissection and removed the tumor without complication. Histopathology revealed a 0.6×0.6 cm-sized duplication cyst, and there has been no recurrence in 2 years. (Korean J Gastroenterol 2011;58:346-349)
Lee, Kwang Jae,Kim, Jin Il,Park, Ju Sang,Moon, Byung Sik,Kim, Sang-Gyun,Chun, Jae Hee,Jung, Hoon-Yong,Choi, Chang Hwan,Chun, Seong Woo,Song, Geun Am,Choi, Myung Gyu,Chun, Hoon Jai The Korean Academy of Medical Sciences 2011 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.26 No.12
<P>The objective of the study was to document practice pattern of gastroenterologists for the management of gastroesophageal reflux disease (GERD) under the minimal influence of the insurance reimbursement guideline. Data on management for 1,197 consecutive patients with typical GERD symptoms were prospectively collected during 16 weeks. In order to minimize the influence of reimbursement guideline on the use of proton pump inhibitors (PPIs), rabeprazole was used for the PPI treatment. A total of 861 patients (72%) underwent endoscopy before the start of treatment. PPIs were most commonly prescribed (87%). At the start of treatment, rabeprazole 20 mg daily was prescribed to 94% of the patients who received PPI treatment and 10 mg daily to the remaining 6%. At the third visits, rabeprazole 20 mg daily was prescribed to 70% of those who were followed and 10 mg daily for the remaining 30%. Continuous PPI treatment during the 16-week period was performed in 63% of the study patients. In conclusion, a full-dose PPI is preferred for the initial and maintenance treatment of GERD under the minimal influence of the insurance reimbursement guideline, which may reflect a high proportion of GERD patients requiring a long-term treatment of a full-dose PPI.</P>
Su Chan Lee,Kwang Am Jung,Chang Hyun Nam,Soong Hyun Jung,Seung Hyun Hwang 대한정형외과학회 2010 Clinics in Orthopedic Surgery Vol.2 No.1
Background: This study examined the results of open wedge high tibial osteotomy with using an Aescula open wedge plateand an allogenic bone graft as a surgical technique for the patients who suffer from osteoarthritis of the knee with a genu varumdeformity. Methods: From March 2007 to August 2007, 33 patients (37 cases) with osteoarthritis of the knee and a genu varum deformityunderwent a high tibial osteotomy with using an Aescula open wedge plate and an allogenic bone graft. The patients werefollowed up for more than 1 year. Before and after surgery, the correction angle of the genu varum was measured by the lowerextremity scannogram and the posterior tibial slope, the joint space distance and the time to bone union were evaluated. Thefunctional factors were evaluated using the Knee Society Score. Results: The average knee score and function score improved from 52.19 ± 11.82 to 92.49 ± 5.10 and 52.84 ± 6.23 to 89.05 ± 5.53,respectively (p < 0.001). According to the lower extremity scannogram, the mean preoperative varus angle was -1.86 ± 2.76°, andthe average correction angle at the last follow-up was 10.93 ± 2.50° (p < 0.001). The tibial posterior slope before surgery and atthe last follow-up were 8.20 ± 1.80° and 8.04 ± 1.30°, respectively (p = 0.437). The joint space distance increased from 4.05 ± 1.30mm to 4.83 ± 1.33 mm (p < 0.001). The average time to complete bone union was 12.69 ± 1.5 weeks. Conclusions: An open wedge high tibial osteotomy using an Aescula open wedge plate and an allogeneic bone graft to treatosteoarthritis of the knee with a genu varum deformity showed good results for the precision of the correction angle, the time tobone union and the functional improvement.
정충현(Chung-hyun Jung),오암석(Am-Suk Oh),김광백(Kwang-Baek Kim) 한국멀티미디어학회 2007 한국멀티미디어학회 학술발표논문집 Vol.2007 No.1
콘크리트 표면의 균열은 영상 획득 과정에서 빛이나 외부 환경에 의해 훼손되는 경우가 발생한다. 또한 콘크리트 표면이 고르지 않은 영상이나 많은 잡음이 있는 콘크리트 영상은 기존의 균열 추출 방법으로 균열 검출이 어렵다. 따라서 본 논문에서는 형태가 왜곡되지 않은 균열뿐만 아니라, 잡음과 유사한 미세 균열까지 효과적으로 추출하고 분석할 수 있는 방법을 제안한다. 본 논문에서 제안한 콘크리트 균열 추출 및 분석 방법은 전처리 과정으로 히스토그램 기반 영상 대비강조 과정을 수행하여 균열의 후보 영역을 검출한다. 검출된 균열의 후보 영역에서 균열의 특징을 이용하여 잡음을 제거하는 과정을 수행한 후, 최종 균열 영역을 정의하고 정의된 균열 영역의 특징을 분석한다. 실제 콘크리트 표면 균열 영상을 대상으로 실험한 결과, 제안한 방법이 기존의 방법보다 균열의 검출 성능이 개선됨을 확인 할 수 있었고 미세 균열에 대한 분석 또한 효과적으로 이루어 졌음을 확인 할 수 있었다.
HVDC 변환설비 PT전원 상실방지 자동절체기 개발 및 운영
조규홍(Gyu-hong Jo),배정현(Jung-hyun Bae),김도암(Do-am Kim),임홍배(Hong-bae Lim),주광복(Kwang-bok Chu),김재준(Jai-jun Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.11
본 논문은 해남-제주간 직류송전설비(HVDC)의 운영 중 변환설비 제어에 사용되는 PT전원 상실에 의한 설비 불시 정지의 해결 방안으로 한국전력공사에서 연구 개발 및 운영 중인 고속도 PT자동절체기에 관한 사항이다. 특히, PT전원 상실시 HVDC가 설비 정지되는 것을 예방하기 위해 반도체소자(TRIAC)를 이용한 고속도 PT 자동절체기를 개발하여 설비 신뢰성을 확보한 내용에 대하여 고찰하였다.
손욱진,이동철,박철현,Won Ho Kim,Kwang Am Jung 대한정형외과학회 2010 Clinics in Orthopedic Surgery Vol.2 No.2
Background: This study evaluated the clinical results of arthroscopically assisted single and double bundle tibial inlay reconstructions of an isolated posterior cruciate ligament (PCL) injury. Methods: This study reviewed the data for 14 patients who underwent a single bundle tibial inlay PCL reconstruction (Group A) and 16 patients who underwent a double bundle tibial inlay PCL reconstruction (Group B) between August 1999 and August 2002. The mean follow-up period in groups A and B was 90.5 months and 64 months, respectively. Results: The Lysholm knee scores in groups A and B increased from an average of 43.3 ± 7.04 and 44.7 ± 5.02 preoperatively to 88.1 ± 7.32 and 88.7 ± 9.11 points at the final follow-up, respectively. In group A, stress radiography using a Telos device showed that the preoperative mean side-to-side differences (SSDs) of 9.5 ± 1.60 mm at 30° of flexion and 9.8 ± 1.70 mm at 90° of flexion were improved to 2.8 ± 1.19 mm and 3.0 ± 1.1 mm, respectively. In group B, the preoperative SSDs of 10.4 ± 1.50 mm at 30° of flexion and 10.7 ± 1.60 mm at 90° of flexion improved to 2.7 ± 1.15 mm and 2.6 ± 0.49 mm, respectively. There was no significant difference in the clinical scores and radiologic findings between the two groups. Conclusions: Single bundle and double bundle PCL reconstructions using the tibial inlay technique give satisfactory clinical results in patients with an isolated PCL injury, and there are no significant differences in the clinical and radiological results between the two techniques. These results suggest that it is unnecessary to perform the more technically challenging double bundle reconstruction using the tibial inlay technique in an isolated PCL injury.