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히트펌프를 이용한 농산물 건조 및 저온저장 시스템(II)- 사과의 저온저장 성능 -
강연구,한충수,금동혁 한국농업기계학회 2007 바이오시스템공학 Vol.32 No.2
攀This study was conducted by the research fund supported by Ministry of agriculture and forest. The article was submitted for publication in January 2007, reviewed in February 2007, and approved for publication by the editorial board of KSAM in April 2007. The authors are Youn Ku Kang, KSAM member, Post-Doctoral Researcher, National Institute of Agricultural Engineering(NIAE), Chung Su Han, KSAM member, Professor, Dept of Bio System Engineering, Chungbuk National University, Cheoungju, Korea, and Dong. Hyuk. Keum, Professor, Dept of Bio-Mechatronic Engineering, SungKyunKwan University, Suwon, Korea.Corresponding author; Y. K. Kang, Energy and Resources Engineering Laboratory, NIAE, Suwon, 441-100, Korea; Tel : +82-31-290-1902; Fax : +82-31-290-1945; E-mail: <ykk0977@rda.go.kr>.攀攀Heat pump systems are recognized to be heating and cooing systems. In this study, to check the practical application possibility of heat pump systems as low temperature storage systems and get basic data, apples of a long term storage items were stored and performance of low temperature storage and quality changes of apples were evaluated.Cooling coefficient of performance of the system was from 1.1 to 1.3. Although ambient air temperature varied widely from -13℃ to 29.6℃ during low temperature storage period from January to June, the average temperature of low temperature storage chamber was 1.1℃ at setting temperature of 1.5℃.Sucrose of apples stored by the heat pump decreased from initial sucrose of 15.4%(Brix number) to final sucrose of 14.3%. Weight loss ratio of apples was 9.7% and internal and external view of apples after low temperature storage were very satisfactory with the naked eye.
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규사와 액상형 고화제를 혼입한 황토모르타르의 특성에 관한 연구
강연구,조창희,이병호 대한건축학회지회연합회 2015 대한건축학회연합논문집 Vol.17 No.1
황토를 현대건축재료로 이용하기 위해서는 황토가 갖고 있는 장점과 현대 건축기술의 장점을 최대화하기 위한 것으로 시멘트를 100% 치환 할 수 있는 고화제를 이용해 황토모르타르에 대한 특성 등의 실험 결과에 따라 최적 배합을 통해 건축물의 구조재 및 마감재료로 사용 가능성을 확인하고 촉진시킴으로써 에너지 사용저감에 따른 환경보전에 기여함을 목적으로 한다. Loess is having to use a modern building material ocher Using a solidifying agent which can be replaced 100% of the cement is intended to maximize the benefits and advantages of the modern construction techniques used to determine the possibility of building and finishing materials with the optimal structural combination, depending on the experimental results, such characteristics of the yellow soil mortar an object of the present invention, and to contribute to environmental protection by promoting in accordance with the reduction of energy use.
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강연구,정훈,이상평,최기환,여형태,이정길 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.9
Four cases of intracerebral hemorrhage remote from the site of initial supratentorial craniotomy are presented. Traumatic cases are excluded in this report and all cases developed after uneventful elective craniotomy. Two patients had ruptured aneurysm and the other two had giant supratentorial tumors, one craniophayrngioma and one ependymoma. All patients were operated on supine position and no patient had preoperative hypertension. Two had hematoma in the subcortical white matter, one in the cerebellar hemisphere and the other one showed hematoma both in the cerebellar hemisphere and the supratentorial subcortical area. The size of hematoma ranged from 8-20㏄ in volume. No definite cause could be found except one in which the blood pressure was transiently elevated during induction of anesthesia. A possible cause might be the sudden changes of blood pressure during induction and recovery from anesthesia, overdrainage of CSF, continuous CSF drainage and sudden changes in intracranial dynamics by removal of a huge intracranial mass. One patient with intracerebellar hemorrhage needed emergency suboccipital craniectomy for removal of the hematoma. One patient with intracerebellar hemorrhage needed emergency suboccipital craniectomy for removal of the hematoma. One patient with intracerebellar hemorrhage needed emergency suboccipital craniectomy for removal of the hematoma. One patient shows no improvement due to aspiration pneumonia and subsequent lung abscess. Although rare these conditions may occur after any craniotomy and surgeons should always be alert to the possibilities of such comlications, especially when intracranial pressure (ICP) was elevated.
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강연구,박소현,서민석,변석수,채동완,이원우 대한핵의학회 2017 핵의학 분자영상 Vol.51 No.4
Purpose We propose a q u a n t i t a t i v e Tc-99m diethylenetriaminepentaacetic acid (DTPA) singlephoton emission computed tomography/computed tomography (SPECT/CT) for glomerular filtration rate (GFR) measurement. Methods Quantitative SPECT/CT data obtained at 2–3 min post-Tc-99m DTPA injection (370 MBq) were used to determine % injected doses (%IDs) for individual kidneys. The reproducibility of %ID measurement was tested and compared with planar scintigraphy. Cr-51 ethylenediaminetetraacetic acid (EDTA) GFR was used as reference standard. Nine young volunteers, representing normal GFR, and ten older volunteers, reflecting impaired GFR, were enrolled. The established GFR equation derived from these volunteerswas applied to 19 renal tumor patients post-partial nephrectomy. Results At 2−3 min, %ID was most reproducible with the highest intraclass correlation (ICC) (0.9379) and lowest % coefficient of variation (CV) (6.5259%), which were more reliable than the ICC (0.9368) and %CV (6.7689%) of planar scintigraphy. Cr-51 EDTA GFR (93.16 ± 24.81 ml/min) correlated significantly with %ID (7.66 ± 2.15%, r = 0.7906, p = 0.0001), yielding an equation: Cr-51 EDTA GFR (ml/ min) = (%ID × 9.1462) + 23.0653. This equation revealed significant decreases in total and nephrectomized kidney GFR (p = 0.0012 and p < 0.0001, respectively) from preoperative to 3-month postoperative measurements. Conclusions Quantitative Tc-99m DTPA SPECT/CT produces reliable and clinically applicable %ID estimates that translate to the GFR of individual kidneys.
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강연구,류영선,장재경,김영화,김종구,강금춘 한국농업기계학회 2014 바이오시스템공학 Vol.39 No.1
Purpose: In this study, the performance of cooling system with the water-water heat pump system of 100kW scale made forcooling agricultural facilities, especially for horticultural facilities, was analyzed. It was intended to suggest performancecriteria and performance improvement for the effective cooling system. Methods: The measuring instruments consisted oftwo flow meters, a power meter and thermocouples. An ultrasonic and a magnetic flow meter measured the flow rate of thewater, which was equivalent to heat transfer fluid. The power meter measured electric power in kW consumed by the heatpump system. T-type thermocouples measured the temperature of each part of the heat pump system. All of measuringinstruments were connected to the recorder to store all the data. Results: When the water temperature supplied into theevaporator of the heat pump system was over 20°C, the cooling Coefficient Of Performance(COP) of the system was higherthan 3.0. As the water temperature supplied into the evaporator, gradually, lowered, the cooling COP, also, decreased,linearly. Especially, when the water temperature supplied into the evaporator was lower than 15°C, the cooling COP waslower below 2.5. Conclusions: In order to maintain the cooling COP higher than 3.0, we suggest that the water temperaturesupplied into evaporator from the thermal storage tank should be maintained above 20°C. Also, stratification in the thermalstorage tank should be formed well and the circulating pumps and the pipe lines should be arranged in order for the relativelow-temperature water to be stored in the lower part of the thermal storage tank.
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