Bi-계 고온초전도 선재의 Jc 향상에 관한 연구(Ⅰ)

정대영,오영우,한일용 慶南大學校 附設 工業技術硏究所 1992 硏究論文集 Vol.10 No.-

Ag가 피복된 Bi-계 고온 초전도 선재의 임계전류밀도(Jc)향상을 위하여 분말 충진법과 아울러 압연과 소결의 혼합공정의 반복법을 사용하였다. 선재에서 높은 Jc를 얻기 위한 요인으로는 높은 고온상(Bi-2223상)분율, 방향화된 미세조직, 입계에선의 강한 결합, 미립의 비 초전도상의 균일한 분포등이다. 압연을 통하여 유된 입자의 방향적 배열화에 의하여 weak-link는 상당히 제거될 수 있었다. 본 연구에서 얻어진 가장 높은 Jc는 77K와 OT에서 6,350 A/cm²의 값이었다. In order to improve the critical current density(Jc)by obtaining well grain-aligned morphology, Ag-sheathed Bi(Pb)-Sr-Ca-Cu-O superconducting tapes were prepared using the powder-in-tube method and a repeatition of the combined process of rolling and sintering. Key factors for obtaining high Jc in the tapes are known to be high content of hegh-Tc phase(Bi-2223 phase), well grain-aligned morphology, good bonding at grain boundaries and uniform dispersion of nonsuperconducting particles. The weak-links could be considerably eliminated by directional grain-alignment induced by rolling. The highest Jc obtained in the present study was 6,350 A/cm²at 77K and OT.

폐경기여성에서 시청각 교육이 호르몬대체요법의 시행과 골다공증관련 생활습관의 변화에 미치는 효과

정태흠,전태희,김문찬,김영일,전대준,양승오,함수연,고병균,김성률 大韓家庭醫學會 2000 Korean Journal of Family Medicine Vol.21 No.11

혈액투석 환자에게서 발생한 재생불량성 빈혈 1예

정지용,윤나라,강대웅,오종찬,장재현,선길홍,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

Aplastic anemia is a disease characterized by pancytopenia in the peripheral blood and hypocellular bone marrow with the fatty infiltration. The causes of the acquired aplastic anemia were usually related to drugs and immune-related diseases. A 34-years old man was admitted due to general weakness. He has been going hemodialysis for 2 years because of end stage renal disease (ESRD) due to chronic glomerulonephritis. At admission, laboratory tests showed hemoglobin 6.2 g/dL, hematocrit 18.0 %, WBC 5,710mm (neutrophil 71.8%, lymphocyte 19.1%, monocyte 5.9%), reticulocyte 1.9%, platelet 93,000/mm, Fe 12.8 ug/dL, TIBC 204 ug/dL, ferritin 941.47 ng /ml, haptoglobin 0.72 g/L, vitamin B12 508.17 pmol/L, folate 24 ng/mL, total protein 6.54 g/dL, albumin 3.76 g/dL, Alk. pohsphatase 79 IU/L, AST 30.0 IU/L, ALT 39.7 IU/L, total bilirubin 0.57 mg/dl, BUN 79.4 mg/dl and creatinine 10.18 mg/dl. Peripheral blood smear showed the normocytic normochromic anemia with anisocytosis. Anemia was diagnosed but it was irresponsive to the recombinant human erythropoietin (EPO) and blood transfusion. In the bone marrow aspiration smear were there the hypoplastic myeloid and erythroid precursors. The bone marrow biopsy section showed the hypoplasia of all components (10-20%) and the fatty infiltration. We have experienced one case of the idiopathic aplastic anemia in a patient going through hemodialysis and we just report it with documentary records. 저자들은 혈액 투석 중인 환자에서 약물, 면역계 이상등의 원인을 발견할 수 없었음에도 재생 불량성 빈혈이 발생한 1예를 경험하여 문헌 고찰과 함께 보고하는 바이다.

동일한 혈관 내에 발생한 이식형 약제 주입기 카테터의 위치이상

오대석,김영재,김명훈,조광래,임세훈,이정한,이근무,정순호,신치만 仁濟大學校 白病院 2010 仁濟醫學 Vol.31 No.-

저자들은 56세 여성 환자의 왼쪽 쇄골 하 정맥에 시행한 이식형 약제주입기 카테터의 삽입 후 발생한 비정상 위치에 대한 증례를 보고하고자 한다. 카테터의 끝은 환자의 늘 어진 가슴, 체위, 신체의 움직임, 카테터의 유동성 등의 영향으로 천자된 정맥 내에서 견인되고 뒤쪽으로 이동하였다. 환자는 어떠한 증상도 호소하지 않았지만 비정상 위치의 카테터는 심각한 합병증을 유발할 수 있기 때문에 제거되었다. 따라서 시술자는 약제주입기 삽입 전에 환자의 신체 상태와 단순 흉부 촬영상을 확인하고 카테터의 비정상 위치가 발생할 수 있는 위험 징후를 알아차려야 하겠다.

하수에서 분리한 합성세제 분해균의 특성

정민선,전진경,정영건,이해경,권오진,지원대,김관배 嶺南大學校 環境問題硏究所 1993 環境硏究 Vol.13 No.1

대구시와 경산시의 하수에서 음이온계 합성세제인 sodium dodecyl sulfate(SDS)와 sodium dodecylbenzene sulfonate(SDBS)를 유일한 탄소원으로 이용하는 균주 289종을 분리하고 이중 합성세제 분해력이 강한, 그람음성 간균으로 운동성인 8균주를 선정하여 그 선정균들의 특성을 조사하였다. 선정균은 40℃ 이상에서는 생육하지 못하였으며 생육 최적 pH는 균주간에 다소 차이가 있었으며 pH 4.0 이하에서는 선정균 모두 생육치 못하였다. 질소원으로는 SDS분해균의 생육에는 potassium nitrate가, SDBS 분해균의 생육에는 soytone이 좋았다. SDS 분해균인 DS-3, 6, 8, 24 및 SDBS 분해균인 BS-7, 8은 세제농도가 5.0% 이상에서도 생육이 가능하였다. 선정균들은 tetracycline에 감수성이 강한 것으로 나타났지만 penicillin에는 강한 내성을 띠는 것으로 나타났고, ??와 ??금속이온은 모든 선정균들의 생육을 억제하는 것으로 나타났다. On purpose to isolate the organisms, which would utilize detergents(sodium dodecyl sulfate, SDS and sodium dodecylbenzene sulfonate, SDBS) as a sole carbon source, from the waste water of Kyungsan and Taegu city 289 strains were isolated. Among them 8 strains, which are gram negative rods with motility and produce strong enzyme to biodegrade the synthetic detergents, were selected. The characteristics of them were investigated as follows, 8 strains were failed to grow above the temperature of 40℃ and below the pH 4.0 even though they have variable optimum pH. Potassium nitrate was very effective for the growth of SDS-biodegradable strains and soytone was effective for the growth of SDBS-biodegradable strains as a sole nitrogen source. Among 8 strains especially DS-3, DS-6, DS-8 and DS-24(SDS-biodegradation strains) and BS-7 and BS-8(SDBS-biodegradation strains) could grow above 5.0% of detergent concentration. All of 8 strains were very sensitive to tetracycline but resistant to penicillin. Selected 8 strains were inhibited by metal ions of ??(0.156mg/㎖) and ??(0.156mg/㎖).

맥반석의 물리화학적 특성 : 수안보 맥반석을 중심으로

한오형,정대석 조선대학교 동력자원연구소 1997 動力資源硏究所誌 Vol.19 No.1

The factory wastes, polluted air and water by a industrial development have been contaminated our living environment in the change processing to join the ranks of advenced countries. In order to improve this environment using the Makban-stone which known to be useful in human body, the experiment of mineralogical property survey and heavy metal adsorption is done. Summarized results are as follows : 1. The major minerals of the Makban-stone through microscopic survey and X-ray diffraction analysis are quartz, plagioclase, microcline, amphibole, and biotite : minor minerals are chlorite, epidote, sericite, montmorillonite, and opaque minerals. 2. The Makban-stone is similar to the samples from Japan, according to chemical component survey, and compared with domestic granite, it shows that the content of SiO₂ is low, and the content of Al₂O₃ high. 3. According to the SEM analysis, most of feldspars have so many pores ranging 1∼10μ, and the shape of pores is a cylindrical one ranging 7∼14A˚. The result of an opening volume measurement by particle analysis is shown that the pores have very good structures needed to be adsorpted. 4. Regardless of pH value, it is confirmed that the Makban-stone absorbed heavy metals(Cd^2+, Zn^2+, Pb^2+, Cu^2+, and Cr^6+). 5. The adsorption of heavy metals by the Makban-stone quoted the Freundlich's isotherm equation. A inclination of Pb, Zn, and Cd, by the least-square methods is 0.2, 0.068, and 0.37, but Cr and Cu with inclination more than 2 cannot use for absorbent.

골격성 Ⅲ급 부정교합자의 악교정 수술후 경·연조직 변화율에 관한 연구

이대희,김정기,김오환 全北大學校 齒醫學硏究所 1992 전북치대논문집 Vol.10 No.1

The purpose of this study was to examine the soft tissue and hard tissue changes following orthognathic surgery in patients with skeletal Class Ⅲ malocclusion and to provide an improved data base for predicting the soft tissue change that accompanys mandibular set back surgery. 25 patients were selected for this study, who had received mandibular sagittal split ramus osteotomy only Statistical analysis was performed with the SPSS package. The results were as follows. 1. There was a posterosuperior movement of the mandible and posteroinferior movement of LI ans LS. 2. The ratio of horizontal changes of soft tissue to hard tissue at Me, Gn, Pog, Pm, B, C was 0.98, 0.97, 0.90, 1.02, 1.01, 0.99 with high correlation. 3. The ratio of vertical changes of soft tissue to hard tissue at Me, Gn, Pog, Pm, B was 0.65, 0.60, 0.82, 0.72, 0.41 with high correlation. 4. 1㎜ of horizontal change at pog resulted in 0.90㎜ at Gns, 0.90㎜ at Pogs, 1.00㎜ at Pms, 1.05㎜ at Bs, 1.08㎜ at Cs. 5. 1㎜ of vertical change at Pog resulted in 0.95㎜ at Gns, 0.82㎜ at Pogs, 0.68㎜ at Pms, 0.67㎜ at Bs, 0.23㎜ at Cs. 6. The ratios of reduction at LS to 1 and LI to 1 were 15% and 96% also ratios of reduction at LS to Pog and LI to Pog were 16% and 112%.

친환경농산물의 경제성분석

정대수,이종성,김기영,오주성,정원복,정순재 東亞大學校 大學院 2002 大學院論文集 Vol.27 No.-

In this study, questionnaire were made to environment- friendly producers of rice, lettuce and persimmon regarding farm management methods in low-input production method utilizing organic materials. The average gross revenue of environment-friendly production of rice was about \2,510, and their average yield was 389㎏/10a, which are 22% and 34% lower, respectively, than the conventional rice production case. lettuce was about \3,280/㎏, and their average yield was 4,299㎏/10a, persimmon was about \1,170㎏, and their average yield was 1,645㎏/10z. In order to improve the environment- friendly productions of rice, lettuce and persimmon industry, active cooperation is needed among the producers, govermment ad researchers more than ever. Among other things, production cost reduction and quality improvement with lower chemical residues are part of the urgent matters to be done.

Bi-계 고온 초전도 선재의 Jc향상에 관한 연구((II)

한일용,정대영,오영우 慶南大學校 附設 工業技術硏究所 1993 硏究論文集 Vol.11 No.-

Powder in tube 방법과 pressing 및 소결의 혼합공정의 반복법을 이용하여 Ag로 피복된 Bi(Pb)-Sr-Cu-O선재를 만드는데 있어서 2223상의 서로 다른 두가지 분말을 사용하였다. 보다 낮은 2223상을 함유하는 분말을 사용해서 만든 선재는 77.3K와 OT에서 Jc가 1*10⁴A/㎠임을 보여주었다. 두 선재의 XRD patterns의 비교, 미세구조, 전기적 성질에 의해서 얻어진 결과는 소량의 2212상의 존재와 최종 pressing후 소결 과정 동안 얻어진 Ca, Cu-rich액상을 형성하는 상은 잘 배열된 2223상의 입자들간의 향상된 결합과 pressing공정 중에 생긴 미세균열의 제거는 치밀한 미세조직과 높은 Jc를 나타내었다. Two powders different in the 2223 phase content were used to prepare Ag-sheathed Bi(Pb)-Sr-Ca-Cu-O tapes by using the power-in-tube method and a repitation of the combined process of pressing and sintering. The tapes prepared using the power with lower 2223 phase content showed a Jc of 1*10⁴A/㎠ at 77.3K and O T. The results obtained by comparing XRD patterns, micromorphology, electrical properties in both tapes, indicated that the presence of a little amount of 2212 phase and Ca, Cu-rich liquid forming phase during the sintering after the final pressing is critical in connecting and eliminating the well aligned 2223 phase grains and microcracks induced by the pressing process, respectively, resulting in a highly densified morphology and a high Jc.

온쓸개관을 묶은 집토끼 위날문점막의 미세구조 연구. : Ⅰ. 날문부 표면점액세포 Ⅰ. Pyloric Surface Mucous Cell

박경호,오승종,고정식,안의태,박대균,정은주 순천향대학교 교수학습개발센터 2004 Journal of Soonchunhyang Medical Science Vol.10 No.3

The purpose of this study was to examine the ultrastructural characteristic of the normal pylorus mucosa, and their structural changes induced by the ligation of common bile duct of the rabbit. Common bile duct ligation probably causes the dysfunction of the pyloric surface mucous cells that results in delayed mucous formation and secretion, but recovered mucous secretory activity is recovered on the late stages.