1회선 분기점을 갖는 병행 2회선 송전선로의 고장점 표정 알고리즘

강상희,권태원,최면송,이승재 明知大學校 産業技術硏究所 2000 産業技術硏究所論文集 Vol.19 No.-

This paper presents a fault location algorithm of a single phase-to-ground fault on a parallel transmission line which contains a teed circuit. The method uses only the local end voltage and current signals. Zero sequence currents of other lines are calculated by distribution factors. Instead of zero sequence current, negative sequence current is used to remove the effect to load current and to calculate the voltage of a fault resistance. There are two distance equations in this algorithm. One of them is to calculate inner part fault location of the tap distance and the other equation is for outer part fault location of the tap distance, Correct fault distance is selected by the condition of each solution. Extensive simulation studies using EMTP have verified that the proposed algorithm can calculate an accurate fault distance in spite of effects of various error sources.

Fe^(3+)-Thiourea Redox 계에서 Nylon 66에 Vinyl계 Monomer의 Graft 공중합에 관한 연구(第1報) : Methyl methacrylate의 graft 공중합

강성구,권순채 영남이공대학 1982 論文集 Vol.11 No.-

The graft copolymerization of methylmethacrylate onto nylon 6.6 fibers was investigated in aqueous solution using the ferric chloride - thiourea redox system as the initiator. The rate of grafting was determined by varying the monomer, initiator, and thiourea, the acidity of the medium. The graft yield increases with increasing the initiator concentration up to 2.0×10^-3M/L and thereafter it slows down. The rate of grafting increases with on increase of thiourea concentration. The percentage of grafting increases with on increase of the monomer concentration.

점증적 최대운동이 항산화 효소의 혈중 농도에 미치는 영향

강신범,이상우,김상권,서해근,김준모 東亞大學校附設스포츠科學硏究所 1999 스포츠科學硏究論文集 Vol.17 No.-

The purpose of this study is to examine how exercise stimulus effects on the boold concentration of antioxidant enzymes. And then, the results of analysing the boold concentration of antioxidant enzymes before and after graded maximal exercise based on high school's 7 males, are as follows: 1. The blood concentration of SOD is found to have a significant increase before and after graded maximal exercise. 2. The blood concentration of CAT is found to have a significant increase before and after graded maximal exercise. 3. The blood concentration of CAT is found to have a significant change. As the above results, the severe exercise of short time is found to increase the blood concentration of SOD as well as CAT. And then, the blood concentration of GPX is found not to have a significant exchange. To examine the mechanism of the above results manifestly, it is considered that the deep study based on exercise style, duration time and exercise intensity, should be continued.

사과 열과(裂果)의 원인과 그 방지에 관한 연구

권병규,강영호,이우승,성민웅,한강원 경북대학교 1971 生産技術 Vol.5 No.-

On the basis of our hypothesis about the causes of cracking has obtained in our 1969's study, we investigated the relations among the cracking and the microelements, the environmental factors, and the treatment of IAA and GA in two selected orchards. We analyzed and compared with the contents of microelements (Mn, B, zn, and Cu) in leaves and soils of two test orchards (Taegu and Yungju). The results of the study which the causes of cracking of apples are examined through the above three procedures, are as follows: 1. The contents of Mn in soil of Taegu test orchard were total Mn 435.9 ppm, soil sol'n Mn 6.2ppm, and total Mn 284.6 pm in leaves. That of Yungju test orchard were total Mn 595.1ppm, soil sol'n Mn 6.2ppm and total Mn 144.2ppm in leaves. Comparing with Mn optimum contents in leaves Mn contents of Taegu test orchard were higher than the optimum concentration, while those of Yungju were approximately satis-factory. 2. The contents of B in leaves were 3.7ppm in Taegu and 4.6ppm in Yungju. These contents were lower ten times than the optimum contents and were the same deficiency in both test orchards. 3. The contents of Zn in leaves were 5.7ppm in Taegu and 3.8ppm in Yungju. Those contents were both the same deficiency as comparing with the optimum contents. 4. The contents of Cu in leaves were 29.3ppm in Taegu test orchard and 10.6ppm in Yungju test orchard. Comparing with the optimum contents, the contents of Cu were excess in Taegu test orchard, while that of Cu were approximately satisfactory in Yungju 5. The diameter of Ralls apple fruits were increased 1.1% in IAA spraying treatment and 3.1% in GA spraying treatment as comparing with control group 6. The thickness of cuticle layer of Ralls apple fruits were highest and the cuticle treated with IAA and GA was thinner than the control group. 7. New branches of tree with higher cracking rate tended to decrease in length, in figure and size of leaves. 8. The change of diameter in fruits were decreased in higher cracking fruits during day and night. The change of that in IAA and GA group were increased 6.1% and 1.2% respectively compared with the control group. 9. The application of IAA and GA solution slowed the cracking rate by 2.2 and 0.8% respectively compared with the control group 10. In 1970 year the cracking rate of Ralls apple fruit were 6.53% in Taegu and 4.31% in Yungju test orchard. 11. We obtained linear regression of rate of cracking and the summation of temperature during May to August in Taegu area. The summation of temperature was 2428.1℃ during June to August in 1970. When the summation of temperature was increased more than above that of tempera ture, we could expect that it was possible to increase the rate of cracking Ralls apple. An equation in the summation of temperature and the rate of cracking fruits during May to August were obtained y=0.074x-157.50. 12. The investigation indicates that a method of preventing the cracking of Ralls apple is: a. to spray at the optimum time growth hormone which increases the elasticity and elongation of cell wall. b. to alter the composition of soil by putting the organic fertilizer deeply in the ground. c. to replace Ralls apples with new varieties which is strong against cracking and have high quality and economical productivity.

신경섬유종증 환자에게서 발생한 특발성 혈소판 감소증 1예

권세훈,김형호,강지인,장재혁,원경준,장재현,김상용,배학연 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.3

Idiopathic thrombocytopenic purpura is a disease characterized by thrombocytopenia in peripheral blood with positive anti-platelet antibody titer, no splenomegaly, the presence of megakarocyte. The causes of idiopathic thrombocytopenic purpura were usually related to autoimmune disease, infection and drugs. A 46-years-old man was admitted for evaluation of abdominal mass. He has many cafe-au-lait spots and nodules in almost skin for 30 years. Several years ago, he palpated mass in Lt. inguinal area. hIe has known the abdominal mass after checking abdomen CT in local clinic and visited our hospital for evaluation of abdominal mass. At admission, laboratory tests showed hemoglobin 12.5 g/dL, hematocrit 38.4 %, WBC 5,460 /㎣ (neutrophil 64.5%, lymphocyte 21.7%, monocyte 4.1%, eosinophil 5.4%), reticulocyte 0.7%, Platelet 52,000 /㎣, total protein 6.51 g/dL, albumin 3.80 g/dL, alkaline pohsphatase 161 IU/L, AST 110.7 IU/L, ALT 64.9 IU/L, total bilirubin 0.44 ㎎/dL, BUN 18.4 ㎎/dL, creatinine 0.79 ㎎/dL. Peripheral blood smear showed normocytic normochromic anemia, thrombocytopenia. Bone marrow aspiration smear showed normoplastic myeloid and erythroid precursor. The bone marrow biopsy section shows normocellular marrow (35%) for his age and mildly increasing myeloid cell lineage. We have experienced a case of idiopathic thrombocytopenic purpura in a patient being in neurofibromatosis and therefore reporting it with documentary records. 저자들은 신경섬유종증 환자에서 특별한 원인을 발견할 수 없었음에도 특발성 혈소판 감소증이 발생한 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다.

工團地域 小河川의 底泥中 重金屬 含量

權五億,梁成鎬,姜善泰 대구산업정보대학 1992 논문집 Vol.6 No.-

This study was carried out to investigate the contents of six heavy metals (Cd, Cr, Cu, Mn, Pb and Zn) in sediment collected at seven sites of 3-Gongdan stream receiving industrial wastewater. The mean Zn, Cu, Mn, Pb, Cr and Cd contents in sediment of all sites investigated was 1496.6mg/kg, 764.4mg/kg, 562.0 mg/kg, 231.6 mg/kg, 37.3 mg/kg and 9.5 mg/kg, respectively. It can be esteimated that the high amount of heavy metals is possibly due to the industrial wastewater, and alkaline pH water when most of the heavy metals are precipitated.

관상동맥질환 환자에서 스텐트 시술 후 재협착에 관한 연구

강진환,권영주,박상호,한대희,이상철,김명구,변정득,최병조,심규혁,온영근,현민수,김성구 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2

Background and aims : In the coronary artery disease, a rate of restenosis was much decreased by placement of coronary stent than when percutaneous transluminal coronary angioplasty has been applied, but there are still important clinical problems of restenosis. There has been many progressive studies about various factors contributed to this restenosis. So, we studied a relation between restenosis after placement of coronary stent in the coronary artery disease and many clinical factors, characteristics of stenotic lesion and procedural factors, and also assessed the restenosis rate of various coronary stents. Methods : Total 58 lesions(46 cases of patients ; man 30, woman 16) were evaluated, which has been performed a follow-up coronary angiography after 6 months (mean 188 days) since coronary stent had been placed. Various stents were implanted and assessed a relation between restenosis and many factors. Results : Of 58 lesions were target stenotic studies, there were 22 of restenotic lesions(37.9%), and the restenosis rate wes statistically significant difference in the relation with diabetes mellitus(p<0.05), group of acute myocardial infarction(p<0.05) among clinical diagnosis of ischemic heart disease(stable angina, unstable angina and acute myocardial infarction) in clinical factors and with high dilation pressure of stent(p<0.05) in procedural factors. When the rate of restenosis was evaluated among implanted stents, it was lowest in the Multilink^(®) stent and highest in the Nir Royal^(®) stent(60%). Conclusion : In this study of restenosis and various factors after placement of stents in the coronary artety disease, factors such as diabetes mellitus, group of acute myocardial infarction and a dilation pressure of stent were significant related with restenosis and the restenosis rate of Multilink^(®) stent was lowest and the highest restenosis rate was of Nir Royal^(®) stent.

Ti첨가 및 균질화 처리가 원심주조한 Cu-Zn-Al계 고력황동의 기계적 성질에 미치는 영향

권영한,허성강,김창규,윤재홍 國立 昌原大學校 産業技術硏究所 1997 産技硏論文集 Vol.11 No.-

Effects of Ti addition and homogenizing treatment on the mechanical properties in Cu-Zn-Al system high strength brass were investigated. Grain refinement was successfully achieved by Ti addition: The microstructure, which was composed of island or fine feather-like branched Ti compounds was changed to feather-like eutectic microstructure as the content of Ti increased. The highest hardness values was obtained for 0.5wt% Ti specimen and the second was Ti non-added specimen in as-cast conditions. Maximum tensile strength was obtained for 0.5wt% Ti specimen. Dueing to the presence of cast defects and worse castability, tensile strength decreased as the content of Ti increased. Elongation was increased with increasing homogenizing time and temperature: remarkable increase was obtained for 400℃ homogenizing temperature in the 0.5wt% Ti specimen. For 500℃ and 600℃ homogenizing temperature, high elongation was obtained in 2 and 4wt% Ti specimen.

Garcin 증후군으로 발현된 연골육종 1예

강성수,김명권,박현미,류근신,신동진 대한신경과학회 1999 대한신경과학회지 Vol.17 No.2

교합성 골수강내 금속정으로 치료한 대퇴골 골절의 치료

권칠수,안종국,김용욱,김진혁,정병현,성열보,강재철 인제대학교 1995 仁濟醫學 Vol.16 No.4

대퇴골 간부 골절시 교합성 골수강내 금속정을 이용한 견고한 고정은 조기 관절 운동과 조기 체중부하가 가능한 보편적인 수술적 치료방법으로 그 사용이 증가하고 있다. 그리고 최근에는 골수강내 금속정이 대퇴골 간부 골절 뿐만 아니라 대퇴골의 근위부나 원위부에 치우친 골절이나 청소년기의 대퇴골 간부 골절의 치료에도 확대되고 있다. 본 논문은 대퇴골 골절 환자 54례를 대상으로 금속정 삽입술의 적응증의 확대와 그에 수반되는 문제점에 관하여 증례 분석 및 결과를 문헌 고찰과 함께 보고하고자 한다. The rigid internal fixation of femur shaft fracture with intramedullary nailing enables early joint motion and weight bearing. This procedure has been used with wide popularity because it is possible simultaneously to preserve the range of motion and to obtain the bone union. But in the proximal and distal femur fracture, the interlocking screws are too close to the fracture site, the rigid fixation cannot be achieved and when early weight bearing is permitted, failure of the metal is possible. Also, when femur fractures in the adolescence be treated with traction followed by casting, sometimes angular deformity and shortening may develope. These problems have solved to the use by intramedullary nailing. The authors reviewed and analyzed 54 cases of the fractures of femur treated by interlocking nails at Sang-Gye Paik Hospital from August 1989 to July 1992. The results were as follows ; 1.Among the 54 patients, male were 42 and female were 12. 2.The mean time of bone union was 19.3 weeks. 3.The authors usually used the closed locked nailing technique to fix the mid-shaft fracture of femur. In cases such as mid-shaft fracture combined wish proximal or distal femoral fracture, for the stability of fracture and the early mobilization, a reconstruction nail or modified nailing technique was used and an excellent bone union was obtained without any complication. 4.In a mid-shaft fractures of the femur in adolescents or young adult, the authors used interlocking nails of proper length or diameter by cutting-off the distal portion of the nail or by over-reaming of the too narrow medullary canal, and the outcome was favorable.