• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 추계학술대회
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• pp.981-984
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• 2014

IBASPM(Individual Brain Atlases using Statistical Parametric Mapping Software)를 이용하여 해마의 체적 측정시, Atlas의 종류(Atlas69, Atlas71, Atlas84, Atlas116)에 따른 체적의 변화를 평가하기 위해 20대 정상 성인 10명(남5/여5, $23.3{\pm}2.66$)으로부터 뇌 영상을 획득하였다. 1.5T MRI system(Siemens, Avanto, Erlangen, Germany)의 머리 격자코일(Head matrix coil)을 사용하여 3차원 경사에코 펄스 열(3-D gradient echo pulse sequence)인 MPRAGE(Magnetization Prepared Rapid Acquisition Gradient Echo)영상을 획득하였다. Atlas의 종류에 따라 획득된 해마의 체적을 이용하여 대응표본 t 검정(Paired t-test)을 수행한 결과, 좌측 해마옆이랑(parahippocampal gyrus - left) Atlas69-Altas84, Atlas69-Atlas116(p=0.729, 0.729), 우측 해마형성체(hippocampal formation - right) Atlas69-Atlas84, Atlas69-Atlas116(p=0.219, 0.219)는 유의한 차이가 없었으며, 이를 제외한 부분에서 유의한 차이가 있었다(p=0.000). 그러고 Atlas84와 Atlas116을 이용한 해마의 체적은 모두 동일한 값을 나타내어 유의한 차이가 없었다(p=0.000). Atlas영상과 원본 영상의 overlay를 이용한 영상분석에서는 Atlas71에서만 해마의 부위가 잘 못 정합되는 것을 발견할 수 있었다. 본 연구에 사용된 Atlas의 경우에는 서양인을 바탕으로 개발되었기 때문에 동양인의 뇌와는 차이가 있으며, 정확성 높은 체적의 측정을 위해서는 상황에 맞는 Atlas의 개발이 필요할 것으로 사료된다.

• 설비공학논문집
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• 제19권1호
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• pp.94-131
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• 2007

A review on the papers published in the Korean Journal of Air-Conditioning and Refrigerating Engineering in 2004 and 2005 has been done. Focus has been put on current status of research in the aspect of heating, cooling, air-conditioning, ventilation, sanitation and building environment. The conclusions are as follows. (1) Most of fundamental studies on fluid flow were related with heat transportation of facilities. Drop formation and rivulet flow on solid surfaces were interesting topics related with condensation augmentation. Research on micro environment considering flow, heat, humidity was also interesting for comfortable living environment. It can be extended considering biological aspects. Development of fans and blowers of high performance and low noise were continuing topics. Well developed CFD and flow visualization(PIV, PTV and LDV methods) technologies were widely applied for developing facilities and their systems. (2) The research trends of the previous two yews are surveyed as groups of natural convection, forced convection, electronic cooling, heat transfer enhancement, frosting and defrosting, thermal properties, etc. New research topics introduced include natural convection heat transfer enhancement using nanofluid, supercritical cooling performance or oil miscibility of $CO_2$, enthalpy heat exchanger for heat recovery, heat transfer enhancement in a plate heat exchanger using fluid resonance. (3) The literature for the last two years($2004{\sim}2005$) is reviewed in the areas of heat pump, ice and water storage, cycle analysis and reused energy including geothermal, solar and unused energy). The research on cycle analysis and experiments for $CO_2$ was extensively carried out to replace the Ozone depleting and global warming refrigerants such as HFC and HCFC refrigerants. From the year of 2005, the Gas Engine Heat Pump(GHP) has been paid attention from the viewpoint of the gas cooling application. The heat pipe was focused on the performance improvement by the parametric analysis and the heat recovery applications. The storage systems were studied on the performance enhancement of the storage tank and cost analysis for heating and cooling applications. In the area of unused energy, the hybrid systems were extensively introduced and the life cycle cost analysis(LCCA) for the unused energy systems was also intensively carried out. (4) Recent studies of various refrigeration and air-conditioning systems have focused on the system performance and efficiency enhancement. Heat transfer characteristics during evaporation and condensation are investigated for several tube shapes and of alternative refrigerants including carbon dioxide. Efficiency of various compressors and expansion devices are also dealt with for better modeling and, in particular, performance improvement. Thermoelectric module and cooling systems are analyzed theoretically and experimentally. (5) According to the review of recent studies on ventilation systems, an appropriate ventilation systems including machenical and natural are required to satisfied the level of IAQ. Also, an recent studies on air-conditioning and absorption refrigeration systems, it has mainly focused on distribution and dehumidification of indoor air to improve the performance were carried out. (6) Based on a review of recent studies on indoor environment and building service systems, it is noticed that research issues have mainly focused on optimal thermal comfort, improvement of indoor air Quality and many innovative systems such as air-barrier type perimeter-less system with UFAC, radiant floor heating and cooling system and etc. New approaches are highlighted for improving indoor environmental condition as well as minimizing energy consumption, various activities of building control and operation strategy and energy performance analysis for economic evaluation.