간경변증 환자에서 도플러 초음파를 이용한 신저항 계수(RI)의 임상적 의의

홍영선,박사영,심기남,김도영,문일환,유정현 梨花女子大學校 醫科大學 醫科學硏究所 1996 EMJ (Ewha medical journal) Vol.19 No.1

Cirrhotic patients may exhibit circulatory derangement and renal dysfunction during the clinical course. Renal dysfunction on cirrhosis can occur without specific causative factors. This functional renal failure in cirrhosis is considered as a consequence of renal vasoconstriction. These alteratons of renal hemodynamics are already present in the early phase of the disease, even in the condition that the conventional kidney function tests are normal. A new method for noninvasive evaluation of arterial tone is duplex Doppler sonography. Among the various sonographic indices proposed, the renal resistive index(RI) is the most widely used for the estimation of intrarenal arteriolar vascular resistence. This study was performed to evaluate the role of Doppler sonography in early detection of renal dysfunction and to assess the clinical significance of RI. In 25 cirrhotic patients without overt kidney failure and ten control subjects, the RI of the acurate artery in both kidneys was measured by Doppler sonography. The mean RI of cirrhotic group was significangly higher than that of control subjects(0,68±0.08 vs -0.62 ±0.05,p<0). Accordiing to Child class, the RI showed increasing tendency from A to C, through witout statistical significance. In this study, the RI was significantly inversely correlated with 24hr urinary sodium amount(r=-0.39, p<0,05)and correlated with serum creatinine(r=6.60,p<0.01). This study indicates that the measurement of RI is a sensitive method to assess intarenal hemodynamics and to detect early changes of the renal dysfunction in cirrhotic patients.

東海岸汽水湖의 陸水學的 硏究

洪思澳,羅圭煥 成均館大學校 1975 論文集 Vol.20 No.-

1. The quality of water and distribution of plankton were investigated of the 6 brackich lakes. Namely Hyang lake, Kwang po lake., Mai lake, Young rang lake, Song ji lake and Hwajin po lake, those which were situated in the east shore during May to December in 1972 and was studied limnological features of those 6 brackish lakes. 2. The average value of Cl'content, hardness and conductivity which had closely influence on the brackish water was measured in those 6 lakes. In the Hwa jin po lake, it found most high value of Cl'content, hardness and conductivity than the other 5 lakes and in the Kwang po lake, it found most lower value of those than the others. 3. From view point of monthly variation of the quality of water, the average value of Cl^-content, hardness and conductivity were a little higher during May and December than during August and October. Compared with the quality of water during May and during Deumber, during May it was substantially higher than during December. In all of the examined lakes except Song ji and Young rang it was substantially higher during August than during September but in Kwang po and Mai lakes, the average value of Cl￣content, hardness during September were higher than during August. 4. 29 sepecies of zooplankton and 82 species of phytoplankton were found in those 6 brackish lakes and so the total 111 species of plankton were confirmed. The dominant phytoplankton species were Lyngbya majuscula, Cocconeis placentula and Spyrogyra sp. and dominant zooplankton species were Sinbcalamus tenellus, Nauplius of Copepoda and Brachionus calyciflorus in those brackish lakes.

感潮河川水의 陸水學的 硏究 : 漢江下流 金浦大橋附近水域의 水質變動에 관하여 Variation of Water Qualities Near the Kimpo Bridge in the Down Area of Han River

洪思澳,羅圭煥,慶春浩 成均館大學校 1980 論文集 Vol.28 No.-

The variation of water qualities in Kimpo of Han river was surved according to the tidal change and also investigated seasonal and regional variation of water qualities in june on summer season and in cotober on autumn season during 1979. Between the surface and the bottom in this Kimpo of Han river the water qualities didn't found any significant difference and also didn't found any difference in periodically. Considering from the value of Cl^-, SO^-_4^2, Na and total hardness the water qualities in Kimpo of Han river may be influenced by a little of the tidal water. The content of nitrogen, Cl^-, phosphate as a pollutant was foung in autumn on dry seaon higher more than in summer on rainy season. Judging from the seasonal variation of water qualities it was more polluted in autumn on dry season than in summer on rainy season. Especially in the drying season on autumn it was considered to be influenced from the sewverly polluted waste water of Bulgwang river and Anyang river. Compared with the water qualities in each site which have deviced 3 sampling points site 1, 2 and 3. Site 1 is north side of this area in which the waste water of Bulgwang river flow down mainly, site 2 is middle of this ares and site 3 is south side in which the waste water of Anyang river flow down mainly. In generally, the water quslities of all those sampling sites were remarkably polluted and especially in site 3 under the influence of Anyang river was found severly pollution than in site 2. The plankton of saprobic species such as Oscillatoria sp., Vorticella sp., Spirogyra sp. and Mougeotia scalaria, which was indicated for the pollution were found much in this area. So it could recognized that the water quality of Kimpoin Han river were remarkably polluted. Also it found some brackish species of planktons such as Brachionus sp., Sinocalanus tenellus and Alona guttata in this area so it considered to be influenced more or less by tidal water.

牙山人工湖의 理化學的水質調査

沈英燮,羅圭煥,洪思澳 成均館大學校 1978 論文集 Vol.25 No.-

The surface and bottom of the water quality in the Asan artificial reservoir have investigated in 6 sites according to the geographycal view points during 3 seasons, summer, autumn and winter. As compared the water quality of two areas near the dike with upper area at 4km distance from dike, it was not found any difference. Vertical variation of water quality was not found certainly difference between the surface and the bottom. Because the depth of this reservoir was no more than 3m, the water temperature was 1℃ high in the surface than bottom in summer, the conductivity increase 7.5μ? high in surface but in autumn and winter the conductivity increase in the bottom especially 12μ? and 13.2μ?. The another items of water quality didn't found any difference. According to the seasonal variation of water quality, the water temperature was 25.6℃ in summer, 17.4℃ in autumn and 4℃ in winter. The concentration of Cl^- was 26.6ppm in summer and gradually increase in autumn and winter especially 103.6ppm and 267.9ppm. The total hardness exhibit much the same tendency with Cl^- and most high in winter as 134.9 ppm. The content of K and Na was lower in summer but most high in winter especially 10.0 ppm and 159.3 ppm. The water quality of the Jin wi river which is one of the water source in this reservoir was severely polluted with industrial waste water. The content of total hardness 152ppm, conductivity 565μ?, the content of COD 6.7ppm, the content of Na 550ppm and the content of Fe 1.4ppm.

Experimental Study on Impact Loads Acting on Free-falling Modified Wigley

Hong, Sa-Young,Kim, Young-Shik,Kyoung, Jo-Hyun,Hong, Seok-Won,Kim, Yong-Hwan Korean Society of Ocean Engineers 2012 International journal of ocean system engineering Vol.2 No.3

The characteristics of an impact load and pressure were experimentally investigated. Drop tests were carried out using a modified Wigley with CB = 0.56. The vertical force, pressures, and vertical accelerations were measured. A 6-component load cell was used to measure the forces, piezo-electric sensors were used to capture the impact pressure, and strain-gauge type accelerometers were used to measure the vertical accelerations. A 50-kHz sampling rate was applied to capture the peak values. The repeatability of the measured data was confirmed and the basic characteristics of the impact load and pressure such as the linearity to the falling height were observed for all of the measurements. A simple formula was derived to extract the physical impact load from the measured force based on a simple mass-sensor-mass diagram, which was validated by comparing impact forces with existing data using the mathematical model of Faltinsen and Chezhian (2005). The effects of the elasticity of the model and change in acceleration during the water entry were investigated. It is interesting to observe that the impact loads occurred and reached peak values at the same time duration after water entry for all drop heights.

Effects of the Crystalline Properties on the Dielectric Performances in Ba0.5Sr0.5TiO3 Thin Films

Sa Hwan Hong,박배호,Dal-Hyun Kim,In Rok Hwang,Jin Ho Lee,Jin Sik Choi,Sang Ho Jeon,Sang Hoon Kim,Seung Eon Moon,강성웅,Vadim Yalishev,Young ill Kim 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.2

The ferroelectric material Ba0.5Sr0.5TiO3 (BST) is a most interesting material due to its large dielectric-constant change with the applied DC electric field. In order to apply BST films to tunable devices compatible with conventional Si-based electronic devices, we need BST films with high tunability, low dielectric loss, and low temperature coefficient of capacitance (TCC). We deposited epitaxial BST thin films on LaAlO₃(LAO) single-crystal substrates at 750℃ by using pulsed laser deposition (PLD). Then, we treated the BST films by using a rapid thermal process for 3 min at 750℃ in an O₂ atmosphere. After the annealing process, the BST films showed enhanced dielectric properties, such as increased tunability values and decreased dielectric loss. These annealing effects on the dielectric performances are ascribed to an elongated in-plane lattice constant accompanying a strain relaxation and increased grain size. The ferroelectric material Ba0.5Sr0.5TiO3 (BST) is a most interesting material due to its large dielectric-constant change with the applied DC electric field. In order to apply BST films to tunable devices compatible with conventional Si-based electronic devices, we need BST films with high tunability, low dielectric loss, and low temperature coefficient of capacitance (TCC). We deposited epitaxial BST thin films on LaAlO₃(LAO) single-crystal substrates at 750℃ by using pulsed laser deposition (PLD). Then, we treated the BST films by using a rapid thermal process for 3 min at 750℃ in an O₂ atmosphere. After the annealing process, the BST films showed enhanced dielectric properties, such as increased tunability values and decreased dielectric loss. These annealing effects on the dielectric performances are ascribed to an elongated in-plane lattice constant accompanying a strain relaxation and increased grain size.

Region-specific changes of CAMKⅡ in cannabinoid receptor type 1 knockout mice

HONG Sa-Ik,YOU In-Jee,KWON Seung-Hwan,JUNG Yang-Hee,KIM Min-Jung,MA Shi-Xun,JOO Hyun-Joong,HWANG Ji-Young,OH Ji-Hwan,KIM Hyoung-Chun,LEE Seok-Yong,JANG Choon-Gon 大韓藥學會 2012 大韓藥學會 總會 및 學術大會 Vol.2012 No.1

Studies on Venerupin Shellfish Poison in Korea

Hong, Sa Suk,Kim, Won Joon,Kim, Kyung Hwan,Lee, Yoo Bock 大韓消化器病學會 1975 大韓消化器病學會雜誌 Vol.7 No.2

Effect of Bile Acids on Biliary Excretion of Cholesterol in Rabbits

Hong, Sa Suk,Kim, Kyung Hwan,Kim, Won Joon Yonsei University, College of Medicine 1973 Yonsei medical journal Vol.14 No.-

Comparative Study of Water-Impact Problem for Ship Section and Wedge Drops

Hong, Sa Young,Kim, Kyong-Hwan,Hwang, Sung Chul International Society of Offshore and Polar Engine 2017 International journal of offshore and polar engine Vol.27 No.2

<P>A comparative study of a water-entry problem was conducted as a focused session of ISOPE-2016, Rhodes by the International Hydrodynamic Committee (IHC) of ISOPE. Thirteen institutions participated, and twenty different numerical results were investigated and compared with one another and with model test data. Some promising results were obtained even though there is still a long way to go to draw general conclusions. Four numerical cases were investigated, and several measures of comparison have been discussed.</P>