• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
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• pp.719-724
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• 2001

In this study, wedge splitting tensile test(WST) using dye penetration method was carried out to investigate cracking criterion and fracture characteristics of concrete. For the this purpose, three levels of compressive strength of 180, 300 and 600 kgf/$\textrm{cm}^2$ and five testing age of 1, 3, 7, 14 and 28 days were selected as test variables. The specimen was loaded in a controlled manner and then dye was inserted at the load of 40%, 70% of the presumed peak load and at the load of 90% just after peak load. The fracture process zone was measured at each load step of a specimen. Test results were compared with analytic results by linear elastic fracture mechanics(LEFM) and numerical results through fictitious crack model(FCM) and finite element method(FEM).

• 터널과지하공간
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• 제5권4호
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• pp.308-317
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• 1995

The stability study on the rock slope where have produced failures in Boryung dam site was evaluated using the streonet analysis techniques. SMR(Slope Mass Rating) approach which is suitable for preliminary assessment of slope stability in rock was also carried out for rating rock mass. The 3-4 major discontinuity sets are distributed and all type of failure(plane, wedge and toppling failure) are presented in this slope face. The dip of slope must be lowered to friction angle(26degree), otherwise the possibility of plane and toppling faiue will always exist in this slope.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2005년도 추계 학술대회논문집
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• pp.195-199
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• 2005

Wave breaking phenomenon near the fore body of a ship is numerically simulated. The ship advance with uniform velocity in calm water. For the simulation, incompressible Navier-Stokes equations and continuity equation are adopted as governing equations. The simulation is carried out in staggered variable mesh system with finite difference method. Marker and Cell(MAC) method and Marker-Density method are employed to track the free surface. Body boundary conditions are satisfied with the adoption of porosity method and no-slip condition on the hull surface. The ship model has a wedge type fore-body, and the computational domain is an appropriate region around the fore-body. The computation results are compared with some experimental results. Also the difference of the free surface tracking methods are discussed.

• 한국정밀공학회지
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• 제22권1호
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• pp.103-108
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• 2005

In this study, to develop a flash-less mold for forming of shoe-outsole, experiments and forming analysis were carried out. In order to reduce the extra-materials, offset method and mass distribution method are used in the preform design. The vertical mold structure pressing the preform was introduced to produce a flash-less shoe-sole. To measure the contact status of parting surface of mold, the pressure film has been used. The guide-gutter system and the continuous pressing mold have been developed for the discharge of extra-materials and re-pressing. By the investigation, flash of shoe-outsole was considerably reduced.

• Journal of Chest Surgery
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• 제25권10호
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• pp.1141-1145
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• 1992

A rare syphilitic abdominal aortic aneurysm associated with pulmonary embolism and deep vein throbosis is reported. We have experienced a huge infrarenal syphilitic abdominal aortic aneurysm which caused venous compression at left common iliac vein. A 29 year-old female was admitted via emergency room due to several episodes of hemoptysis. Clinical evaluation for this patient revealed a couple of small ill-defined masss densities on the both lung field and abominal aortic anuerysm. Emergency wedge resections of left upper and lower lobes were performed because of a massive hemoptysis. Pathologic diagnosis showed pulmonary infarction. 20 days after thoracotomy an elective operation on abdominal aortic anuerysm was successfully carried out and post operative pathology finding showed syphilitic aortitis.

• Journal of Chest Surgery
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• 제26권3호
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• pp.204-208
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• 1993

The review of 68 patients, who were diagnosed as spontaneous pneumothorax during the period from Dec, 1991. to Jul, 1992. were performed thoracoscopy of 70 cases under local anesthesia with 1% lidocaine at the department of thoracic & cardiovascular surgery, HanYang University Hospital. Clinical data on distribution of Age & Sex, Location, Frequency of Reccurrence and other aspects of pneumothorax were summerized.37 cases were treated by thoracoscopic management and closed thoracostomy. As thoracoscopic management, Electrocauterization of bullae or blebs[37 cases], Endo-clip application [2 cases], Removal of foreign body[1 case] were performed. 31 cases were cured by open thoracotomy. The thoracotomy indications under thoracoscopic finding were followed as: 1. Severe pulmonary adhesion and destroyed lung parenchyme 2. multiple bullae or blebs on several areas 3. finding of pulmonary tuberculous caseous lesion 4. persistant air leakage after 7 days from thoracoscopic management Excision, wedge resection of bullae or blebs was performed in most cases [22 cases], 2 cases by median sternotomy and Segmentectomy of 7 cases were carried out depending on the pathologic change of lung.There was no operative mortality and Follow-up for all patients were showed good results.

• 한국전산유체공학회지
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• 제20권1호
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• pp.26-31
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• 2015

A grid generation program for specific problems is introduced. The program allows users to easily generate grid system for specific geometry such as an airfoil, cylinder, wedge, flat plate, and nozzle. Generating grid system for those problems can be proceeded with minimum user inputs such as geometry-defining parameters and grid-defining parameters. By using this program learning stage for preprocessing of CFD application can be efficiently shorten and novice students can learn and acquire experience by trying out grid generation and CFD solution by themselves.

• Journal of Chest Surgery
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• 제33권7호
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• pp.597-600
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• 2000

폐실질에 발생하는 자궁내막증은 월경시마다 반복되는 특징적인 증상을 갖는 드문 질환이다. 저자는 유산 및 출산 경험이 없는 3개월의 월경성 각혈의 증상을 가진 19세의 여자 환자를 흉부 전산화 단층촬영으로 확진 하였으며 우측 병변은 흉강경을 이용한 쐐기 절제술, 연이어 좌측 병변은 개흉술을 통한 상분엽절제술을 시행하였다. 수술 전에 시행하였던 투시경(fluoroscopy) 도음하의 hooking이 일측폐 마취에서의 병변의 확인에 도움을 주었다.

• 수산해양기술연구
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• 제13권1호
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• pp.1-5
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• 1977

A series of echo-sounding and current measurements as well as the drogue and the drift bottle experiments were carried out in Asan Bay since November 1974. Several sand bars or sand flats covered by silts were developed at ebb tide in the bay. Sand waves and sand ripples were seen on the surface of the sand bars, around which sea channels of 8~ 12 meters in depth are formed. The main stream axis of the flood current which is separated into east and west branch flows southward. A cyclonic and an anticyclonic eddy are developed at the early stage of flood tide. They are transformed into a clockwise eddy before the slack water. The maximum tidal current speed observed was 3.1 ~ 3.2 knots at the entrance of the bay, while it was 1.O ~ 2.8 knots in the bay. The location of the main stream axis of the tidal current coincides well with the sea channel. A salt wedge was observed at the estuary of the Sabgyo-cheon River.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2018년도 춘계 학술논문 발표대회
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• pp.316-317
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• 2018

Thailand and other Southeast Asian countries are experiencing frequent floods due to heavy rainfall and are using the Flood Rapid Defense System(FRDS) for an emergency. However, they are expensive and has a wedge-shaped panel suitable for the dirt bank, making it unsuitable for applications in Southeast Asia, a relatively underdeveloped country. In this study, the direction of development of FRDS was derived through domestic and overseas case analysis. Future studies should be carried out to develop the actual FRDS according to the development directions presented here. These results will be effective in preventing flooding of buildings in Southeast Asia as well as in Korea.