전기 방열기가 국화재배온실의 난방에 미치는 영향

서원명 ( Won Myung Suh ),임재운 ( Jae Woon Leem ),김영주 ( Young Ju Kim ),민영봉 ( Young Bong Min ),김현태 ( Hyeon Tae Kim ),허무룡 ( Moo Ryong Huh ),윤용철 ( Yong Cheol Yoon ) 경상대학교 농업생명과학연구원(구 경상대학교 농업자원이용연구소) 2010 농업생명과학연구 Vol.44 No.4

경상대학교 교내에 설치되어 있는 1-2W형 온실을 대상으로 전기 방열기를 이용하여 국화 재배온실의 난방효과를 검토한 결과는 다음과 같다. 실험기간동안 최고, 평균 및 최저 외기온은 각각 -3.8~21.3℃, -5.2~16.1℃ 및 -12.5~14.4℃ 정도의 범위로 나타났으며, 온실 내외의 평균상대습도 각각 43.5~98.6% 및 35.2~100%로 나타났다. 12월 중순부터 2월 상순까지 최저 외기온은 대략 -5.0~-10.0℃ 전후로 나타나 진주기상대의 최근 자료와 비교하면 상대적으로 최저기온이 낮게 나타나는 경향이 있었다. 야간의 경우, 방열기 직하부의 엽온이 방열기 중간 지점에서 측정한 엽온 보다 크게 2~3℃정도 높게 나타나거나 또는 미미하지만 약간 높게 나타나는 경향이 있었다. 근권부의 경우, 직하부나 중간 지점에서의 온도 차이는 거의 없는 것으로 나타났고, 근권부의 최고온도와 기타 최고 온도의 발생 시점을 보면, 약 2시간정도의 지체현상이 있음을 알 수 있었다. 그리고 실험기간동안 난방에 소요된 총 소비전력량, 공급에너지 및 총 난방비는 각각 2,800kWh, 2,408,000kcal 및 112,000won 정도였다. 화석연료인 경유로 난방할 경우, 총 난방비는 224,500won 정도였다. 방열기를 이용하여 난방할 경우, 난방비를 약 50% 정도 줄일 수 있을 것으로 판단되었다. An analysis in heating effects of an electric radiator located in a 1-2W type chrysanthemum (3 cultivars) cultivation greenhouse installed in Gyeongsang National University drew the following conclusions. During the experiment period, the highest, average, and the lowest outside temperatures were in the ranges of -3.8~21.3℃, -5.2~16.1℃ and -12.5~14.4℃, respectively, and the average relative humidity inside and outside the greenhouses were in the ranges of 43.5~98.6% and 35.2~100%, respectively. From mid-December to early February, the lowest outside temperature was recorded as approximately -5.0~-10.0℃, which showed that it tended to be relatively lower than the temperatures recorded at the Jinju Meteorological Observatory. During the night, the leaf temperature measured directly under the radiator tended to be higher by 2~3℃ than that those at the middle point of the radiator, or higher by anegligible amount. In the case of root zone temperature, it was found that there was almost no difference between temperatures of the part directly under and the middle point, and the time when the highest temperature of root zone and other highest temperatures took place showed that there was about a 2-hour delay phenomenon. The total electricity consumption, energy supply and total heating cost during the experiment period were 2,800 kWh, 2,408,000 kcal and 112,000 won, respectively. When diesel, a kind of fossil fuel, was used as heating oil, the total heating cost was around 224,500 won. It was estimated that the total heating cost could be reduced by around 50% if a radiator was used.

급성대동맥박리증에서 수술전 경식도심초음파도의 역할

박성훈,원태희,원용순,한재진,안재호,이귀용 梨花女子大學校 醫科大學 醫科學硏究所 1999 EMJ (Ewha medical journal) Vol.22 No.1

급성대동맥박리증은, 특히 상행대동맥을 침범한 경우, 응급수술을 요하는 질환으로서 수술전 대동맥판의 손상여부, 질환의 범위, 내벽파열부위의 위치 및 가지혈관의 상태등을 파악하여 수술계획을 수립하여야 한다. 저자들은 상행대동맥을 침범한 3례의 급성대동맥박리증 환자에서 전산화단층촬영과 함께 수술전 또는 필요에 따라 수술후 경식도심초음파도를 시행하여 환자의 치료에 도움을 받았기에 문헌고찰과 함께 보고하는 바이다. Acute type A arotic dissection is a condition which requires emergency surgery. Surgeons want to know not only the extent of the disease but also the exact site of intimal tear as well as the presence of side branch involvement to plan the extent of surgery. Various non-invasive diagnostic tools(transthoracic and transesophageal echocardiography, conventional and spiral computed tomography and magnetic resonance imaging) and invasive angiography are available for the evaluation of the extent of dissection, site of intimal tear and side branch involvement. Each technique has its advantage and disadvantage. Especially, MRI has been accepted as a gold standard for the diagnosis of aortic dissection, but it is immobile and sometimes it cannot give us the information about the small intimal tear site. Transesophageal echocardiography has the advantage of movability and high resolution in addition to the ability of providing comprehensive information about the cardiac function. Because of these advantages, it has been widely utilized for the evaluation of patients with aortic dissection. We performed preoperative transesophageal echocardiography in addition to computed tomography in 3 cases of acute type A aortic dissection and report these cases with the review of articles.

야뇨증 환아들의 심리사회적 특성에 대한 다기관 연구 : 행동 및 정서 문제를 중심으로

조수철,김재원,신민섭,황준원,한상원,박관현,이상돈,김경도,김건석,서홍진,이유식,정재용,김영균,문두건,남궁미경,한창희,조원열,김영식,배기수,이종국,정우영,신의진 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.6

Objectives : The aim of this study was to examine the behavioral and emotional problems associated with nocturnal enuresis in Korean children. Methods : Three hundred eighteen children with nocturnal enuresis, together with their parents, completed the Child Behavior Checklist (CBCL), Disruptive Behavior Disorder Scale according to DSM-IV (DBDS), Children's Depression Inventory (CDI), State-Trait Anxiety Inventory for Children (STAIC), and Piers-Harris Children's Self-Concept Scale (PHCSC). Ninety-three normal students were selected as the control group. Results : Compared to the normal control group, the mean scores with regard to the withdrawn, social problems, attention problems, delinquent behavior, aggressive behavior, externalizing problems and total problems profiles were significantly higher in the nocturnal enuresis group according to the CBCL results. The nocturnal enuresis group also scored significantly higher in the ADHD and ODD profiles of the DBDS. The nocturnal enuresis group was more depressed and anxious than the control group according to the results of the CDI and STAI. The mean score of the PHCSC was significantly lower in the nocturnal enuresis group when compared to the normal control group. Conclusion : The results of this study suggest that children with nocturnal enuresis in Korea have clinically relevant behavioral and emotional problems. The findings support the link between nocturnal enuresis and psychopathology in Korean children.

우심방을 침범한 거대 비호지킨씨 림프종 1예

강상범,진승원,이은경,박용현,최용호,김용주,박준철,김재형,홍순조,최규보,권종범,원용순,박건,이은희 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.4

복강경을 이용한 대장 부분 절제 시행 1예

박재갑,서경석,정회원,김선회,오용석,송인성,박용현 대한대장항문학회 1993 Annals of Coloproctolgy Vol.9 No.1

고관절 전치환술시 응용프로그램을 이용한 수술 전 계획

원중희,김용민,최의성,손현철,박경진,남기세,정재중 대한고관절학회 2003 Hip and Pelvis Vol.15 No.3

Nortriptyline 제제의 생물학적 동등성에 관한 연구

신재국,차인준,장인진,정원석,김용식,박찬웅,신상구 大韓臨床藥理學會 1993 臨床藥理學會誌 Vol.1 No.1

2個의 對稱表面龜裂의 相互干涉擧動 解析과 龜裂形狀變化 豫測 解析

崔鎔湜,金在元 成均館大學校 科學技術硏究所 1991 論文集 Vol.42 No.1

2個의 對稱表面龜裂에 대한 應力擴大係數는 아직 數式化된 形態가 存在하지 않기 때문에, 먼저 2個의 對稱表面龜裂을 갖는 PMMA 板材를 試驗片材料로 選擇하여 一定振幅 引張-引張形 疲勞試驗을 遂行한 後, 表面龜裂이 成長함에 따라 隣接한 두 龜裂의 間隔變化에 의한 干涉擧動을 解析하여, 單獨表面龜裂의 應力擴大係數에 대한 2個의 對稱表面龜裂의 應力擴大係數의 比로 定義되는 相互作用係數(Interaction Factor)를 9次 多項式으로 數式化하였다. 이때 表面龜裂의 疲勞成長擧動을 適切하게 單純化시켜서, 두 表面龜裂間에 相互干涉效果가 있는 最近點에서의 相互作用係數를 구하였는데, 이 相互作用係數는 다른 硏究者들의 解析結果와 比較되어 妥當性이 立證되었다. 單獨表面龜裂材에 대한 龜裂形狀變化 豫測 모델이 이 相互作用係數에 適用되어 2個의 對稱表面龜裂을 갖는 材料의 龜裂形狀變化를 豫測하는 節次를 設定하였다. 이 節次에 따라 2個의 對稱表面 龜裂을 갖는 PMMA 板材試驗片에 대하여 龜裂形狀變化를 豫測하여 實驗結果와 比較하였다. 2個의 對稱表面龜裂의 形狀變化 豫測節次過程에서는 두 表面龜裂間의 相互干涉效果와 合體條件 등이 單純化되어 適用되었으며, 이러한 單純한 假定에 의하여도 상당히 精密度 좋게 龜裂의 形狀變化가 豫測되었다. 또한 單獨表面龜裂의 形狀變化 豫測에서, 낮은 應力水準 즉, σ_max<0.2σ_YS의 範圍에서 龜裂形狀變化를 精密度 좋게 豫測하기 위하여 導入된 補正係數 F_s의 有效性이, 2個의 對稱表面龜裂의 形狀變化 豫測에서도 立證되었다. An analysis scheme for predicting the crack aspect pattern of materials which contain twin surface cracks was developed. Fatigue tests were performed on twin surface cracked PMMA plate specimens to obtain the interaction factor accounting for the interference effect of adjacent cracks. Here, the interaction factor is defined as the ratio of the stress intensity factor for twin surface cracks to that for a single surface crack. From the analysis of the fatigue test results, the interaction factor was presented as the ninth-order polynomial expression having a function of dimensionless crack spacing ratio. Then the polynomial expression was incorporated into the prediction program of the crack aspect pattern for twin surface cracked materials. And, the interaction effect and the coalescence condition of adjacent cracks were simplified in the newly developed prediction scheme of the crack aspect pattern. The predicted crack growth pattern using the prediction scheme was compared with test data from PMMA specimen. The predicted pattern agreed well with the test data.

對稱 二重 板狀 表面龜裂의 相互干涉에 對한 硏究

崔鎔湜,梁源鎬,金永鎭,金在元 成均館大學校 科學技術硏究所 1988 論文集 Vol.39 No.2

In this paper, the authors experimentally investigated interaction effects of twin surface cracks on crack growth rate in the process of fatigue fracture. Because of convenience of measuring crack length toward the thickness direction, transparent PMMA plate specimens with twin circular arc type notches were used for the experiments. Fatigue tests were performed on the specimens with crack aspect ratio b/a=0.267 varying the width and thickness of the specimen. From the test results, the interaction effects of twin surface cracks on fatigue crack growth rate were evaluated, and crack growing aspects during fatigue crack growth process were examined as well. The followings were obtained fromm the experimental analyses. Regardless of the specimen thickness, it was found that the crack growth rate around the surface crack tip increased in the region of crack distance ratio λ{=(a + a*) /e} ≥ 1.0 according to the interaction effect of the twin surface cracks. The magnitude of the fatigue crack growth rate became larger in the following order; (1) the internal crack-tip points, (2) the deepest points of the crack-tip, and (3) the external crack-tip points. During the fatigue process, the varying crack aspect ratios (b/a) of colinear surface cracks appeared to be smaller than those of the single surface crack.

Oxalate와 Enrofloxacin투여한 랫트신장에 대한 병리조직학적관찰

오원석,이차수,오규실,정원일,정재용,정다히,정규식 한국임상수의학회 2003 한국임상수의학회지 Vol.20 No.4

To investigate the renal effects of enrofloxacin administration on rats induced with dehydration or hyperoxaluria, male rats were treated with enrofloxacin of 50 mg to 500 mg/kg b.w.. The microscopical observations of kidney and urine sediment were carried out in the experimental groups. The result obtained were as follows; The male rats deprived of water for 72 hours and administered with enrofloxacin. As enrofloxacin administration dose was increased, clinical signs such as loss of appetite, depression, weakness, and loss of urine output became more severe. In the histopathological findings, there were hyperemia and hemorrhage in renal cortex, vacuolation and necrosis of renal tubular epithelia, proteinous casts within renal tubules. The male rats were orally administered with sodium oxalate and injected with enrofloxacin for 7days. As enrofloxacin administration dose was increased, clinical signs such as the loss of appetite and water consumption, and weakness became more severe. In the histopathological findings, there are hemorrhage of glomeruli and cortical hyperemia, vacuolation and necrosis of tubular epithelia, proteinous casts in renal tubules. In the microscopical findings of urine sediment, there are calcium oxalate crystal (diamond-like type) and magnesium ammonium phosphate crystals (rhomboid). The male rats were intraperitoneally injected with sodium oxalate and administered with enrofloxacin for 7days. As enrofloxacin administration dose was increased, clinical signs such as the loss of appetite and water consumption, weakness were more severe. In the histopathological findings, there were hyperemia and hemorrhage in both glomeruli and renal cortex. Severe necrosis of renal tubular epithelia, bluish materials within renal tubules were also found. In the microscopical findings of urine sediment, there were many calcium oxalate crystals. The present results suggest that enrofloxacin has some injurious effects in rats having dehydration or hyperoxaluria, and clinically, we should consider these renal injury effects when we use enrofloxacin in patients accompanied renal disease, dehydration and hyperoxaluria conditions.