열화상 정보를 이용한 온실 환경 모니터링 및 환경제어 시스템 개발

류관희 서울대학교 농업개발연구소 1999 농업생명과학연구 Vol.3 No.-

This study was carried out to investigate a plant-growth monitoring system using infrared thermography which can detect plant responses to improper environment. The experimental system for measuring leaf temperature using thermography consisted of a thermal camera, image processor, personal computer, and plant growth chamber. Under the N-deficiency or excess stress, the leaf temperatures of cucumber and lettuce were 2℃ and 1℃ lower than controls, respectively. Under the N deficiency stress the leaf temperature of hot pepper was 1℃ lower than control. Under the N excess stress, however, the leaf temperature of hot pepper did not change. Under the potassium deficiency or excess stress, the leaf temperatures of cucumber and hot pepper were 2℃ lower than controls, respectively. Under the potassium excess stress, the leaf temperature of lettuce was 2℃ lower than control. Under the potassium deficiency stress, the leaf temperature of lettuce did not change. Under the phosphorous deficiency stress, the leaf temperatures of cucumber and hot pepper were 2℃ and 1.5℃ than controls, respectively. However the leaf temperature of lettuce did not change. Under the water deficiency stress, the leaf temperatures of cucumber and lettuce were 2℃ and 1℃ higher than controls, respectively. However, the temperature of hot pepper was 1℃ lower than control. It was possible to detect the changes in leaf temperature by infrared thermography when subjected to nutrition or water stress. Since the changes in leaf temperatures were different each other for plants and kinds of stress, however, it would be necessary to add a nutrient measurement system to a plant-growth monitoring system using thermography.

청정채소 공정생산 자동화 시스템 개발

류관희 서울대학교 농업개발연구소 2000 농업생명과학연구 Vol.4 No.-

The purpose of this study was to develop an automated vegetable production system for plant factory from transplanting to harvesting. The system was designed to be able to have consistent automatic processes of operation such as transplanting, complementary transplanting for the cells with missed or bad seedling, transferring growing troughs into the cultivation benches, automatic spacing at growth stages, harvesting and packing. The design criteria for the automated vegetable production system were set up, the individual units of the system were tested separately, and the integrated system was also tested through lettuce growing experiment. The automated vegetable production system functioned well, but the work capacities and accuracies of the some units such as the harvesting unit should be further improved.

첨단온실의 원격 생육환경 감시 시스템 개발

류관희 서울대학교 농업개발연구소 2001 농업생명과학연구 Vol.5 No.-

This study was carried out to desing, construct, and test a greenhouse monitoring system for supervising the greenhouse environment from a remote site, by using internet. The measurement items selected among many environmental factors were temperature, humidity, solar radiation, CO_2 concentration, SO and NO concentration of atmosphere, EC, pH of nutriend solution, the state of control devices, and images of the inside of greenhouse. The greenhouse monitoring system was composed of a network system and a measurement module.

光陽地域 金屬鑛床에 대한 岩石學的 및 鑛物學的 硏究

金熙南,柳官善 조선대학교 기초과학연구소 1986 自然科學硏究 Vol.9 No.1

The studied area is lobated in the central part of Kwang-Yang, Chullanamdo, which is in the south west of the Gyeongsang basin, The geology consists of the Pre-Cambrian Jirisan gneiss complex as its country rock, covered with the Gyeongsang system sedimentary rock giving unconformity in the Cretaceous period, and is intruded by volcanic rocks and plutonic jgneous rocks. These deposits are fissure filling hydrothemal ore deposits which were formed through fissure with the strike N 20^˚~50^˚E and the dip 70^˚~85^˚SE in the Pre-Cambrian Jirisan gneiss complex. They consist of gold, silver, and quartz veins. Ore minerals are chalcopyrite, arsenopyrite, pyrrhotite, pyrite, galena, sphalerite, native gold, bornite, and covellite. The source rock of the ore minerals is granite porphyry, plutonic igneous rocks intruded in the late Cretaceous period. The method of study is as follows: 150 pure rock samples and 50 ore samples were picked up around the deposits and outcrops, and classified according to the distributed areas and their kinds. 80 thin sections out of 150 rock samples and 40 polished sections out of 50 ore samples were made and a modal analysis were made of them each. And 10 out of the thin sections were made chemical analysis. 5 out of the polished sections were made X-Ray diffraction analysis, which made a verification of what kind of ore minerals are contained in them. As a result of the modal analysis, the granite rocks ill the studied area are plotted by quartz monzodiorite, and have the similarity of the Bulgugsa granite rocks, and its gneiss is plotted by granodiorite and is similar to the Hongjesa granite gneiss. From the results to the Hongjesa granite gneiss but are poor in SiO_2 and rich in FeO, MgO and MnO, For this reason, it is thought that these rocks contain the minerals of the garnet group. These rocks belong to the alkali-calcic rock series in the alkali lime index composed by Peacock. By the I-S type classification by White, Chappell(1977) and Hine(1978) and by the A C F diagram and the normative’s Qu-Or-Ab triangular diagram, these rocks originated from sedimentary rocks. The Proportion of the alk:fm of the Niggli mean value is 19:46, and these rocks were possibly generated from before the Bulgugsa granite and Masan granite age. From the AMF diagram these rocks are coincident with the Gyeongsang basin trend in granite and similar to the Hyndmann trend in gneiss. In the AKF diagram and normative Or-Ab-An diagram, the rocks in the studied area are rich in albite, and compared with S.R. Nockold’s world rock mean value, they belong mostly to tonalite and diorite.

조기위암의 임상적 연구

박태준,양은수,류종철,박태군,이희승,신원창,이진호,김관엽 인제대학교 1994 仁濟醫學 Vol.15 No.1

1989년 9월부터 1993년 7월까지 인제대학교 의과대학 상계백병원에서 실시한 위내시경 소견이 조기위암이며 내시경 직시하 생검결과 선암으로 판명되어, 근치적 위절제술을 시행받은 23명의 환자에서 임상적 특징을 알아보고, 문헌고찰과 함께 보고하는 바이다. The incidence and mortality rate of stomach cancer ranks well ahead of all malignancies in Korea. The prognosis is excellent in early gastric cancer of which the overall 5 years survival rate of 85∼95% is comparative with that of advanced gastric cancer of 15∼49%. So early detection with very sensitive mordality of gastroscope and surgery is the only premise to decrease the mortality rate of gastric cancer. This report deals with the clinical aspects of 23 cases of early gastric cancer, which were confirmed with histopathologic examination of resected stomach during the 4 years from September 1989 to July 1993 at Sanggye Paik hospital, Seoul, Korea. Out of 23 cases of early gastric cancer, 14 cases were male, 9 cases were female, and the male to female ratio was 1.6 : 1. The most common type of early gastric cancer was talc type(43.5%), IIc and its combined type comprised most of them(87.0%). The most prevalent sloe of lesion was gastric angle(43.5%) and the most common direction was lesser curvature(73.9%) 19 cases of 23(78.3%) were between 1∼3cm in size, and there was no statistical significance between the size of the lesion and lymph node metastasis. Of the 9 cases with mucosal lesion, there were 2 cases with lymph node metastasis(22.2%), but 7cases(50.0% ) of 14 cases with submucosal lesion presented lymph node metastasis. Diagnostic accuracy of endoscopy on detection of early gastric cancer was 17 cases(73.9%) of total 23 cases in our study. As with other report, histopathulogic examination of resected stomach revealed adenocarcinoma, tubular type as the most common type. Frequent complaint of patients with early gastric cancer was epigastric pain(65.2%), and duration of the symptom was less than 12 months in 17 cases(73.1%) of 23 patients with early gastric cancer.

다구역 재배용 양액 자동 조제ㆍ공급 시스템 개발

Ryu Kwan-Hee(류관희),Kim Gi-Young(김기영),Cheon Sung-Pil(전성필) (사)한국생물환경조절학회 2000 시설원예‧식물공장 Vol.9 No.1

기계시각을 이용한 육묘용 로봇 이식기의 개발

류관희(Ryu Kwan Hee),김기영(Kim Gi Young),이희환(Lee Hee Hwan),한재성(Han Jae Seong),황호준(Hwang Ho Jun) (사)한국생물환경조절학회 1997 시설원예‧식물공장 Vol.6 No.1

전기비저항을 이용한 철탑 기초 제원 예측

류희환(Hee-Hwan Ryu),김태균(Tae-Kyun Kim),연관희(Kwan-Hee Yun),김경열(Kyoung-Yul Kim),조선아(Seon-Ah Jo),한세진(Se-Jin Han) 대한전기학회 2019 대한전기학회 학술대회 논문집 Vol.2019 No.7

증착각도에 따른 비정질 Se₇₅Ge₂₅박막의 광유기 효과에 관한 연구

柳熙寬(Hee-Kwan Ryu),許?(Hyee Huh),金榮浩(Young-Ho Kim),鄭鴻倍(Hong-Bay Chung) 대한전기학회 1987 전기학회논문지 Vol.36 No.2

혈액투석중인 말기신부전 환자에서 Fludrocortisone acetate (FCA) 투여 후 혈청 칼륨 저하 효과

류봉관,강대웅,정지용,윤나라,신병철,박경희,정종훈,김현리 朝鮮大學校 附設 醫學硏究所 2005 The Medical Journal of Chosun University Vol.30 No.1

Background: Hyperkalemia is a commonly encountered problem in dialysis patients with end-stage renal disease. In this study we evaluated the effect of mineralocorticoid therapy (fludrocortisono acetate) on serum potassium level in the serum of hyperkalemic end-stage renal disease patients. Methods: Fourteen patients on hemodialysis receiving fludrocortisone acetate (FCA) 0.1 mg/day were observed for 2 months periods. Consecutive monthly biochemical profiles were compared for the druration of the pre-and post-treatment of FCA. Result: Fourteen patients with mean age (±SE) of 51.5 years (4 males and 10 females) and mean hemodialysis period of 51.9 months were studied. Mean serum potassium levels significantly fell (p<0.05) during the post-FCA period (5.2±0.66 mEq/L) compared with potassium levels during the pre-FCA (5.8±0.43 mEq/L) period. Pre-and post-FCA values were not different for sodium, chloride, protein, albumin, AST/ALT, glucose, blood nitrogen, creatinine, phosphate and calcium. Conclusions: FCA appears to decrease serum potassium value in patients with end-stage renal disease. These results suggested that FCA could be effective to treat hyperkalemia without any adverse effect in patients undergoing hemodialysis.