• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.5
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• pp.2075-2080
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• 2013

A Coolant core for Range Extender engine has been developed using CFD technique. Coolant by-pass has been added to the improved model to reduce temperature near and between exhaust valve. Due to the increased coolant flow-rate both around the second cylinder block and between exhaust valves, improved model shows no significant stagnant flow compared with base model. Finally, the improved model shows improved heat transfer coefficients near exhaust valves, and 5% reduced pressure-drop through the coolant core. Reduced pressure-drop may increase the fuel efficiency by reducing the load of a coolant pump.

• Clinical and Experimental Pediatrics
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• v.49 no.6
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• pp.696-699
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• 2006

Tolosa-Hunt syndrome is a rare disease in children characterized by dull, persistent pain around the affected eye and ophthalmoplegia caused by granulomatous inflammation in the cavernous sinus, superior orbital fissure, or orbit. Although spontaneous remission can occur, corticosteroids frequently have a dramatic response; however, recurrence can transpire after complete remission. We report an 11-year-old girl with Tolosa-Hunt syndrome who responded to corticosteroid promptly, without complications, but suffered three recurrences of headache and retro-orbital pain and required maintenance on a low dose of steroid.

• Proceedings of the KIEE Conference
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• 2000.11d
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• pp.845-847
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• 2000

깊은 생체 조직에서 전자기 에너지의 일부가 피부로 전달되는데, 이때 생체 내부에서 피부로 전달되는 전자기 에너지의 세기는, 주파수 대역과 전자기파를 흡수, 반사, 투과시키는 인체의 매질에 따라 다르다. Microwave Radiometry는 인체 내부 조직에서 방출되는 1-6 GHz 대역의 전자기 에너지 일부를 피부 표면에서 측정하여 일정한 체적내의 인체 내부 온도 평균온도를 추정하는 방법이다. 이러한 Radiometry로 암이나 종양 등의 이상 조직을 진단하는 의학적 가설은, 암이 진행시 악성 종양의 세포의 신진대사가 정상 세포보다 활발하게 되고 또한 종양 세포 주위로 혈액의 유입이 증가하게되어, 주위의 정상 세포 보다 열을 보다 더 방출하는 데 있다. 이때 발생된 열은 일정한 주파수 대역의 마이크로파 에너지를 방출하게 되고, 이에 Radiometry로 인체에 무해하고(passive), 비침습적(non-invasive), 방사능의 영향이 없는 (non-ionizing) 방법으로 인체 내부에서 전달되는 전자기 에너지 강도를 측정하여 종양 부위와 주위 정상부위의 온도 차이를 추정 의학진단에 응용할 수 있다. 본 논문에서는 이러한 Microwave Radiometry의 의학적 응용과 생리학적 특성을 고려한 인체모델용 팬텀에 대하여 살펴본다.

• Journal of the Society of Naval Architects of Korea
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• v.36 no.1
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• pp.70-81
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• 1999

To predict the viscous boundary layers and wakes around a ship, the CFD techniques are commonly used. For the efficient application of CFD tools to practical hull farms, a 3-D field grid generating system is developed. The present grid generating system utilizes the solution of Poisson equation. Sorenson's method developed for 2-D is extended into 3-D to provide the forcing functions controling grid interval and orthogonality on hull surface, etc. The weighting function scheme is used for the discretization of the Poisson equation and the linear equations are solved by using MSIP salver. The trans-finite interpolation is also employed to assure the smooth transition into boundary surface grids. To rove the applicability, the field grid systems around a container ship and a VLCC with bow and stem bulb are illustrated, and the procedures for generating 3-D field grid system are explained.

• Journal of the Society of Naval Architects of Korea
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• v.36 no.3
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• pp.8-14
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• 1999

The flor characteristics around the KRISO 3600TEU container ship model have been experimentally investigated in a subsonic wind tunnel. The mean velocity and turbulence characteristics in the stern and wake regions were measured using an x-type hot-wire probe. The flow characteristics in the stern and near wake regions revealed a complicated three-dimensional flow pattern. The measured results showed clearly the formation of longitudinal vortices and their effect on the flow pattern in the wake region. The shear layer developed along the ship model expands showly to the downward direction. The turbulence statistics measured can be used as comparative data of numerical simulations and provide insights into development of accurate turbulence models for the ship design.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.41 no.6
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• pp.73-80
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• 2004

In this paper, we propose a medical image processing method for detection of periodontal disease. The proposed method is the method of an automatic image alignment and detection of minute changes, to overcome defects in the conventional subtraction radiography by digital image processing technique, that is necessary for getting subtraction image and ROI(Region of Interest) focused on a selection method using the structured features in target images. And the method services accuracy, consistency and objective information or data to results. In result, easily and visually we can identify minute differences in the affected parts whether they have problems or not, and using application system.

• Transactions of the Korean Society of Mechanical Engineers
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• v.8 no.2
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• pp.127-132
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• 1984

In this paper, stress concentration factor and distribution of slotted or notched plate which is subjected to uniaxial tensile load are studied. The experimental measurements have shown the following; (1)The stress around slot or notch of slotted or notched plate which is subjected to uniaxial tensile load is state of biaxial stress, which is mainly varied to notch radius and depth. (2)The stress concentration factor around slot or notch is mainly influenced by the .sigma.$_{yy}$ , it is varied with notch radius and depth. (3)For the notched specimen, there is a notch depth where stress concentration factor is maximum. On the other hand, for the slotted specimen, stress concentration factor increases as the notch depth increases. An investigation of the relationship between fracture and stress concentration factor due to the slot or notch will be presented on the later paper, for reference.

• Transactions of the Korean Society of Mechanical Engineers
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• v.12 no.4
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• pp.721-729
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• 1988

Recently, the precision required by precision manufacturing and machinery related to electronics is within the domain of submicron that it is difficult to evaluate them by traditional measuring equipments and methods. Accordingly, precision of sub 0.1.mu.m super precise position-decision-apparatus and straight-guide air bearing have been researched and they are almost ready to be used. In utilizing straight-guide-table for super-precision-measurement which used externally pressurized porous air bearing as a way of externally pressurized air bearing, the high-precision-straight movement is the most crucial. In this study, the researcher conducted the experimental study with trial manufacture to see how the surrounding temperature and support condition influenced the selection and allocation of the machine composing element which is important to the high-precision-straight movement. The researcher finding showed that when the property of the rail part and support part of the semi-closed slider form is different, the heat generation of the working motor and surrounding temperature influence the high-precision-straight movement significantly and the researcher showed the influence of the condition of central load and eccentric load to the straight movement precision when the support stand of the straight-table was supported by numerical values.

• Investigative Magnetic Resonance Imaging
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• v.12 no.2
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• pp.197-200
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• 2008

Intracapsular and paraarticular chondroma is a rare benign lesion of the large joints (mostly the knee). We report a case of intracapsular and paraarticular chondroma in the infrapatellar Hoffa’s fat pad that presented as a painful palpable mass in 15-year-old woman. A physical examination revealed a firm, movable and tender mass in the infrapatellar area. Magnetic resonance images showed an ovoid, well-defined, soft tissue mass with focal calcification in the infrapatellar fat pad. The final pathology revealed an intracapsular and paraarticular chondroma.

• Neonatal Medicine
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• v.15 no.2
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• pp.172-175
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• 2008

Hemangioma is the most common benign tumor of infancy. Greater than 60% of hemangiomas occur on the head and neck, and have an uncomplicated course. In contrast, most complicated hemangiomas develop in the urogenital or anogenital areas. These lesions are frequently associated with pain, bleeding, recurring infections, and ulcerations. Sometimes, perianal ulcerative hemangiomas are difficult to treat with multiple therapies, such as laser and steroid therapy. We managed a case of a severe perianal ulcerative hemangioma in a male newborn who did not respond to conservative management. He was successfully treated after a colostomy.