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Kang, Geum-Chun,Kim, Yeong-Jung,Yu, Yeong-Seon,Baek, Lee 한국농업기계학회 2002 바이오시스템공학 Vol.27 No.6
In order to control the root-zone temperature of greenhouse crops in the hydroponics at hot and cold season, heat pump system for cooling and heating was built and tested in this work. The system was air-to-water type and vapour compression type. The heating and cooling mode was selected by the four way valve. Capacity of the compressor was 3.75㎾ and heat transfer area of the evaporator and the condenser were 3.05㎡ and 0.6㎡, respectively. According to the performance test, it could supply heat of 42,360 to 64,372kJ/h depending on the water circulation rate of 600 to 1,500ℓ/h, respectively, when indoor air temperature was 10∼20$\^{C}$. COP of heat pump system was 3.0 to 4.0 in the heating mode. But, COP of the cooling mode was 1.3 to 2.1 at indoor temperature of 20∼35$\^{C}$. The feasibility test in the greenhouse the developed heating and cooling system was installed, showed that the heating cost of the developed system was only about 13% of that of the conventional heating system. The heating cost of the developed system was 367won/day(electric consumption 9.7㎾h/day), while that of the conventional system was 2,803won/day(oil consumption 7.7ℓ/day) at the same heating mode.
Kang, Youn Ku,Ryou, Young Sun,Jang, Jae Kyung,Kim, Young Hwa,Kim, Jong Goo,Kang, Geum Chun Korean Society for Agricultural Machinery 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 for cooling agricultural facilities, especially for horticultural facilities, was analyzed. It was intended to suggest performance criteria and performance improvement for the effective cooling system. Methods: The measuring instruments consisted of two flow meters, a power meter and thermocouples. An ultrasonic and a magnetic flow meter measured the flow rate of the water, which was equivalent to heat transfer fluid. The power meter measured electric power in kW consumed by the heat pump system. T-type thermocouples measured the temperature of each part of the heat pump system. All of measuring instruments were connected to the recorder to store all the data. Results: When the water temperature supplied into the evaporator of the heat pump system was over $20^{\circ}C$, the cooling Coefficient Of Performance(COP) of the system was higher than 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 $15^{\circ}C$, the cooling COP was lower below 2.5. Conclusions: In order to maintain the cooling COP higher than 3.0, we suggest that the water temperature supplied into evaporator from the thermal storage tank should be maintained above $20^{\circ}C$. Also, stratification in the thermal storage tank should be formed well and the circulating pumps and the pipe lines should be arranged in order for the relative low-temperature water to be stored in the lower part of the thermal storage tank.
임상 ; 미숙아에서 태변 장폐색의 임상적 특징 및 예후
김천수 ( Chun Soo Kim ),김은하 ( Eun Ha Kim ),이상락 ( Sang Lak Lee ),강경지 ( Kyung Ji Kang ),이금채원 ( Geum Chae Won Yi ) 대한주산의학회 2012 Perinatology Vol.23 No.4
목적 : 태변 장폐색은 점착성의 농축된 태변이 회장 말단과 대장에 축적되어 발생하는 일시적 장폐색으로 알려져 있다. 이 연구는 미숙아에서 발생하는 태변 장폐색의 임상소견과 예후를 알아보고자 시행하였다. 방법 : 2009년 1월부터 2011년 12월까지 일개 대학병원 신생아 집중치료실에 입원했던 미숙아를 대상으로 의무기록과 방사선 영상소견을 통하여 후향적으로 연구하였다. 태변 장폐색의 진단은 임상증상과 gastrografin 관장 검사의 이상 소견 둘 다 있는 경우로 하였다. 대조군은 출생연도와 재태연령을 동일한 조건으로 맞춘 미숙아 중에서 2배수 무작위 추출하였다. 결과 : 연구 대상으로 합당한 태변 장폐색군 환아는 43명이었다. 주산기 임상소견 중 산모의 고혈압증과 황산마그네슘 사용 빈도는 장폐색군에서 더 높았으나 통계적 유의성은 없었고, 부당 경량아의 빈도는 장폐색군이 대조군보다 더 높았 다(14% 대 3.5%; P<0.05). 수유장애의 동반율도 장폐색군이 대조군보다 더 높았다(86% 대 24.4%; P<0.001). 1례를 제외 한 모든 환아에서 gastrografin 관장은 1회 시행하였고, 영상소견상 소결장은 7예(16.3%)에서 동반되었다. 전례에서 관 장의 합병증 발생은 없었다. 태변 장폐색을 가진 환아에서 조영관장 후 폐색의 호전은 방사선 영상소견상 6.5±10.0일에 이루어졌고, 이는 임상증상의 호전 시기인 7.5±9.4일보다 더 빨랐다(P<0.05). 완전 장관영양의 도달 시기는 장폐색군이 25.4±14.3일로 대조군(16.4±9.3일)보다 더 느렸고, 재원기간도 장폐색군에서 더 길었다(P<0.001). 결론 : 미숙아에서 수유장애는 태변 장폐색을 시사하는 소견이 된다. 태변 장폐색은 완전 장관영양의 도달 시기를 지연 하거나 재원기간을 연장하는 요인이 된다. Purpose : This study was undertaken to investigate the clinical features and outcomes of meconium intestinal obstruction (MIO) in preterm infants. Methods : A retrospective analysis of medical records and radiologic images was conducted in a neonatal intensive care unit over a 3-year period (2009-2011). In addition, birth year- and gestational age-matched babies were selected by random sampling with twice the number as the control group. Results : There were 43 infants with MIO who were appropriate as subjects. In perinatal factors, a maternal history of hypertension and the use of magnesium sulfate were more frequent in patients with MIO, but not significant. Feeding intolerance was more common in the MIO group than the control (86% vs. 24.4%; P < 0.001). The frequency of gastrografin enema was once in all but one of the patients, and the microcolon was detected in 7 cases (16.3%). Radiographic change after enema was seen earlier than clinical improvement (P < 0.05).The patients with MIO took longer to achieve full enteral feeding, and had a more prolonged hospital stay (P <0.001). Conclusion : Feeding intolerance in preterm infants may be an early clinical finding of MIO. Meconium obstruction causes a delay of full enteral feeding and extension of hospital stay.
Jeong, Geum-Cheol,Song, Minchul,Park, Hee Jeong,Min, Jung-Joon,Bom, Hee-Seung,Cho, Sang-Geon,Park, Ki Seong,Kang, Sae-Ryung,Kim, Jahae,Song, Ho-Chun,Kwon, Seong Young The Korea Society of Nuclear Medicine 2016 핵의학 분자영상 Vol.50 No.4
Purpose Serum thyroglobulin (Tg) level is frequently elevated shortly after radioactive iodine (RAI) ablation therapy. The authors studied the relationship between the elevation of serum Tg after RAI therapy and iodine uptake pattern on post-ablation whole body scans (RxWBSs) in patients with papillary thyroid carcinoma (PTC). Materials and Methods The study subjects were patients with PTC that had undergone first RAI therapy with thyroid hormone withdrawal after total thyroidectomy. Patients with a high level of serum anti-Tg antibody (TgAb, ${\geq}60U/mL$), possible regional or distant metastasis as determined by pre-ablation or post-ablation studies, and negative iodine uptake of the anterior neck on RxWBS were excluded. Serum Tg was checked twice, that is, 7 days after (post-ablation Tg) and on the day of RAI therapy (pre-ablation Tg). Ratio of pre-ablation Tg to post-ablation Tg (Tg ratio) was used to assess changes in serum Tg levels after RAI therapy. Patients were classified into two groups according to the presence of midline uptake above the thyroidectomy bed on RxWBS (negative (group 1) or positive (group 2) midline uptake). Variables were subjected to analysis to identify differences between the two groups. Results Two hundred and fifty patients were enrolled in this study; 101 in group 1 and 149 in group 2. Based on univariate analysis, post-ablation Tg ($8.12{\pm}11.05$ vs. $34.12{\pm}54.31$; P < 0.001) and Tg ratio ($7.81{\pm}8.98$ vs. $20.01{\pm}19.84$; P < 0.001) were significantly higher in group 2. On the other hand, gender, tumor (T) stage, lymph node (N) stage, size, multiplicity or bilaterality of primary tumor, dose of $^{131}I$, serum TgAb and thyroid-stimulating hormone (TSH) level (before or after RAI therapy) were not significantly different in the two groups. Variables with P values of < 0.25 by univariate analysis were subjected to multivariate analysis, which showed post-ablation Tg (OR 1.060, 95 % CI = 1.028-1.092; P < 0.001) and Tg ratio (OR 1.059, 95 % CI = 1.028-1.092; P = 0.001) were significantly higher in group 2. Conclusion Serum Tg level after RAI therapy was significantly higher in patients with midline uptake on RxWBS, compared with patients without midline uptake on RxWBS. Further investigations are needed to reveal the correlation between serum Tg elevation and clinical outcome according to the presence of midline uptake.
목분-폴리프로필렌 복합재의 수분흡수율: 목재수종, 충진제 입자크기 및 상용화제의 영향
강인애 ( In Aeh Kang ),이선영 ( Sun Young Lee ),도금현 ( Geum Hyun Doh ),전상진 ( Sang Jin Chun ),윤승락 ( Seung Lak Yoon ) 한국목재공학회 2010 목재공학 Vol.38 No.4
The effects of wood species, chemical components, filler loading level, filler particle size, and coupling agent on the water absorption property of the wood flour filled polypropylene (PP) composites were investigated in this study. After 500, 1,000, 1,500, 2,000, 2,500 and 3,000 hr water immersion, Quercus (Quercus accutisima Carr.) and Maackia (Maackia amuresis Rupr. et Maxim) showed significantly lower water absorption properties compared to Larix (Larix kaempferi Lamb.). As wood flour loading increases from 10 to 50 wt%, most wood species showed increased water absorption after a given immersion period. Particle size of wood flour proved to have very significant effects on water absorption of the composites. The effect of coupling agent was positive in terms of lowering water absorption of the composites. As the treatment level of coupling agent increases, the water absorption of the composites decreases. The lowest water absorption was obtained at the lower wood flour loading (Maackia), smaller particle size and by the addition of coupling agent. Thickness swelling of the composites shows close dependency on water absorption.