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- 저자 : Woo Sup Roh (검색결과 34 건)
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Dong-Woo Ha,Sang-Cheol Kim,Jae-Gun Oh,Hong-Soo Ha,Nam-Jin Lee,Kyu-Jeong Song,Tae-Hyung Kim,Rock-Kil Ko,Ho-Sup Kim,Seong-Kuk Park,Sang-Kil Lee,Yu-Mi Roh,Sang-Soo Oh IEEE 2007 IEEE transactions on applied superconductivity Vol.17 No.2
<P>The important merit of Bi-2212/Ag high T<SUB>c</SUB> superconducting wire is to apply cable as round wire geometry. Bi-2212/Ag wires were fabricated in order to develop Rutherford cable for SMES near the future. Various Ag ratio and various numbers of filaments for PIT (powder-in-tube) process were applied to investigate the workability during drawing and to improve critical current property of the wires. In order to find proper working process, we investigated the variation of drawing stress during working. Post-annealing of Bi-2212/Ag wires at various atmospheres was carried out after main heat-treatment in order to increase critical current density. The results of post-annealing in nitrogen were better than that of post-annealing in oxygen. J<SUB>c</SUB> of Bi-2212/Ag wire was increased as increased maximum temperature,T<SUB>m</SUB> , for partial melting until 890degC, and highest J<SUB>c</SUB> was over than 2000 A/mm<SUP>2</SUP>. The shape of grain was observed by SEM to investigate Bi-2212 phase formation in filaments. The critical current density increased in proportion to the increase of Bi-2212/Ag wire's filaments number.</P>
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노성우,정상섭,박용구,임승철,이규창 대한신경외과학회 1987 Journal of Korean neurosurgical society Vol.16 No.4
To preserve function of the acoustic nerve and brainstem during posterior fossa surgery, the authors monitored (brainstem auditory evoked potentials) in 42 cases of posterior fossa surgery who were operated at the Department of Neurosurgery of Yonsei University College of Medicine from March, 1983 to February, 1987. The results were summarized as followings : 1) There were 28 cases of hemifacial spasm, 13 cases of trigeminal neuralgia and 1 case of cerebello-pontine angel tumor. 2) Among the 41 cases of neurovascular decompression, there were 10 cases(24%) with hearing impairment postoperatively. But there was no postoperative auditory dysfunction in 13 cases of hemifacial spasm in which caudal approach was utilized. 3) There was no postoperative auditory dysfunction in the patients who showed intraoperative BAEPs of Types Ⅰ, Ⅱ and Ⅲ which were characterized by no loss of waves, but 10 cases(77%) who showed BAEPs of Types Ⅳ, Ⅴ and Ⅵ which were characterized by loss of the waves showed auditory dysfunction postoperatively.
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Roh, Young-Sup,Hur, Kye-Ong,Eom, Doo-Seop,Lee, Yeon-Woo,Tchah, Kyun-Hyon The Korea Institute of Information and Commucation 2005 Journal of communications and networks Vol.7 No.3
The smooth handoff supported by the route optimization extension to the mobile IP standard protocol should support a packet buffering mechanism at the base station (BS), in order to reduce the degradation in TCP performance caused by packet losses within mobile network environments. The purpose of packet buffering at the BS is to recover the packets dropped during intersubnetwork handoff by forwarding the packets buffered at the previous BS to the new BS. However, when the mobile host moves to a congested BS within a new foreign subnetwork, the buffered packets forwarded by the previous BS are likely to be dropped. This subsequently causes global synchronization to occur, resulting in the degradation of the wireless link in the congested BS, due to the increased congestion caused by the forwarded burst packets. Thus, in this paper, we propose an implicit priority forwarding (IPF) packet buffering scheme as a solution to this problem within mobile IP based networks. In the proposed IPF method, the previous BS implicitly marks the priority packets being used for inter-subnetwork handoff. Moreover, the proposed modified random early detection (M-RED) buffer at the new congested BS guarantees some degree of reliability to the priority packets. The simulation results show that the proposed IPF packet buffering scheme increases the wireless link utilization and, thus, it enhances the TCP throughput performance in the context of various intersubnetwork handoff cases.
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노창섭,최대균,우이형,최부병,Roh Chang-Sup,Choi Dae-Gyun,Woo Yi-Hyung,Choi Boo-Byung 대한치과보철학회 1992 대한치과보철학회지 Vol.30 No.3
This study was performed to investigate the phonetic alterations with upper anterior teeth were missing. To compare the changes of the phonations, before and after insertion of the temporary prosthesis, six subjects who lost their upper anterior teeth were selected (2-male, 4-female). Tested sounds (/ga(가), na(나), da(다), ra(라), sa(사), ja(자), cha(차), ta(타), pa(파), ha(하), gi(기), ni(니), di(디), ri(리), si(시), jl(지), chi(치), ti(티), pi(피), hi(히), seu(스), se(세), so(소), su(수)/were programmed into an IBM AT with and without temporary prosthesis. These experiments were analyzed by formants, consonants durations, and energy level changes with an LSI speech work station program. During the pronunciation of the tested sounds (with and without temporary prosthesis), mandibular movements were recorded to a Mandibular Kinesiogram and analyzed . The findings led to the following conclusions: 1. Objective differences could not be found. However, in every informant, subjective improvement could be noticed. 2. There were no persistant correlations of the formant's changes. And in every informant, phonetic changes were variable. 3. There were various changes of the consonant durations in every informant. By and large, those of /si(시), jl(지), chi(치), Pi(피), hi(히)/ were longer than other tested sounds. After insertion of the prosthesis, durations were shorter. Consonants with /i(ㅣ)/ were longer than with /a(ㅏ)/, with or without prosthesis. 4. With and without temporary prosthesis, mandibular movements were various in the frontal view. Mandibular movements showed lateral deviations, and mandibular positions with /si(시), ji(지), ti(티), seu(스), hi(히)/ were nearer to the mandibular rest position. 5. The kinds of temporary prosthesis and conditions of the missing teeth influenced every informant variously, so there were no correlation between informants. 6. Energy levels increased in all tested sounds with a fixed temporary prosthesis. And, there were no differences between before and after insertion of a removable temporary prosthesis. However, sibilant sounds, and consonants with /i(ㅣ)/ showed a little increased energy level.
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Yoon, Seo-Yeon,Woo, Jiwan,Park, Joon-Oh,Choi, Eui-Ju,Shin, Hee-Sup,Roh, Dae-Hyun,Kim, Key-Sun International Anesthesia Research Society 2015 Anesthesia and analgesia Vol.120 No.3
<P>The regulator of G-protein signaling protein type 4 (RGS4) accelerates the guanosine triphosphatase activity of G(αi) and G(αo), resulting in the inactivation of G-protein-coupled receptor signaling. An opioid receptor (OR), a G(αi)-coupled receptor, plays an important role in pain modulation in the central nervous system. In this study, we examined whether (1) spinal RGS4 affected nociceptive responses in the formalin pain test, (2) this RGS4-mediated effect was involved in OR activation, and (3) the ?-OR agonist-induced antinociceptive effect was modified by RGS4 modulation.</P>
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콜레스테롤 投與 흰쥐에 있어서 乳酸菌 醱酵乳의 飮用效果
李容旭,盧宇燮 서울大學校保健大學院 1992 國民保健硏究所硏究論叢 Vol.2 No.1
This study was performed to investigate the long term effect of fermented milk in drink in rats fed by hypercholesterolemic diet for 12 months. In order to attain the object, 150 of 3-week-old male rats of Sprague-Dawley strain were divided into six groups according to diet and content of fermented milk in drink. This first group served as normal control group fed by standard diet. The second, cholesterol control group, was treated with standard diet containing 1% of cholesterol and 500,000 IU/㎏ of vitamin D₂. The other four groups, fermented milk groups, FM-25, FM-50, FM-75 and FM-100 were treated with standard diet containing 1% of cholesterol and 500,000 IU/㎏ of vitamin D₂ and supplied simultaneously with 25%, 50%, 75% and 100% of fermented milk in drink, respectively. The animals were sacrificed for analysis in 3,6,9 and 12 months. The results were as follows: 1. Rats in all groups treated with cholesterol and vitamin D₂ showed significantly lower food intake than did that of normal control (p<0.05). The drink consumption of fermented milk groups were significantly higher than those of normal control and cholesterol control groups(p<0.05). 2. Rats in all groups treated with cholesterol and vitamin D₂ lost weight in 6 months. The body weight of the rats in fermented milk groups increased after 6 months while all the rats in the cholesterol control group died. The more percentage of fermented milk in drink increased, the more they gained weight. 3. Food and protein efficiency ratios of each group showed a tendency similar to that of body weight change. The ratios in fermented milk groups increase in 12 months while that became blunted in normal control group. 4. The relative weights of liver, kidney, heart, spleen, and adrenal gland in cholesterol were higher than those in normal control group (p<0.05). No tendency of the relative organ weight among fermented milk groups and feeding period was observed. 5. The content of calcium in serum by feeding period significantly decreased in all groups (p<0.05). In case of the content of inorganic phosphorous in serum, no significant difference among groups or feeding periods was observed though that was the highest in the cholesterol control group. 6. The fermented milk groups showed significantly lower total cholesterol than did the cholesterol control group(p<0.05). The more percentage of fermented milk in drink increased, the lower the content got. The ratio of HDL-cholesterol to total cholesterol in fermented milk groups was significantly higher than that in cholesterol control group though it showed a tendency of decreasing by feeding periods. No tendency of content of serum protein and glucose among groups and feeding periods was observed.
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한국산 전통 간장과 된장의 숙성 중 Aflatoxin의 변화와 그 특징 : 제 2 보 Part 2
김종규,노우섭 대한보건협회 2000 대한보건연구 Vol.26 No.1
The changes of aflatoxins of traditional Korean soy sauce (kan-jang) and soybean paste (doen-jang) during ripening and storage for 12 months and the characteristics of the changes were investigated. All of the preparation methods for meju cakes (soybean cakes), soy sauce, and soybean paste followed the recommendations of the Korea Food Research Institute. Food components and aflatoxins were analyzed at 0, 3, 6, 9, and 12 months. At the initial stage aflatoxins were detected at a trace level (below the detection limit, 2 ppb), 7.2 ppb, 2.8 ppb, and 3.9 ppb in soybeans, meju cakes, soy sauce and soybean paste, respectively. We suspect that the process of making and fermenting meju cakes was mainly responsible for the aflatoxin contamination in the soy sauce and soybean paste. Parts of the toxins in the soybean paste were degraded during ripening and storage and showed only a trace level in 6 months. Although the aflatoxin content of soy sauce increased over 1 year of storage time, it was still far below the 10 ppb safety limit of the Standards and Specifications of Korea; furthermore we could expect destruction of parts of toxin in the soy sauce when we boil it in cooking. It was strongly suspected that these changes in the soy sauce and soybean paste were due to the difference in their crude fat and fatty acid content. This study indicates that soy sauce and soybean paste are quite safe to eat; although more research should be conducted to discover how to eliminate even the low levels of aflatoxin found especially in the soy sauce.
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