젊은 성인에서 흡연에 의한 상완동맥 내피기능의 부전에 관한 연구

이상철,권영주,방덕원,이선해,이보영,김지욱,김영훈,온영근,현민수,김성구 순천향의학연구소 2002 Journal of Soonchunhyang Medical Science Vol.8 No.1

Background and Objectives : Cigarette smoking is a major factor and the most modifiable risk factor for atherosclerosis. Endothelial dysfunction is an early event in atherosclerosis, before the structural change of the systemic arteries. We hypothesized that endothelial dysfunction might be present in the systemic arteries of young adult smokers and that this might be dose-dependent phenomenon. Therefore, we try to certify that smoking is associated with endothelial dysfunction in healthy young adults without other risk factor of atherosclerosis. Subjects and Methods : we studied noninvasively 29 subjects aged 3 to 4 decades without other risk factor of atherosclerosis, they were composed of the two groups, current smokers(n=15) and nonsmokers(n=14). Smoking history varied from 3 to 20 pack years. Using high-resolution ultrasound, vessel diameter and mean flow rate were measured at rest, during reactive hyperemia(with flow-mediated endothelium-dependent dilation), and after sublingual nitroglycerin(NG-induced endothelium-independent vasodilation). Result : Flow mediated endothelium dependent dilation was observed in the control subjects (9.4±3.44%) but was impaired in the smokers(5.8±2.51%)(p=0.004). NG-induced endothelium independent dilation is no difference in all subjects. Conclusion : Cigarette smoking is associated with endothelial dysfunction in healthy young adults.

Effects of hydrogen plasma treatment on SnO2:F substrates for amorphous Si thin film solar cells

Min-Seung Choi,Young-Ju Lee,Jung-Dae Kwon,Yongsoo Jeong,Ju-Yun Park,강용철,Pung Keun Song,Dong-Ho Kim 한국물리학회 2013 Current Applied Physics Vol.13 No.8

We investigated the effects of hydrogen plasma treatment on the physical and electrical properties of fluorine-doped tin oxide (FTO) films used for amorphous silicon (a-Si) thin film solar cells. A slight increase in carrier concentration by the hydrogen doping effect was observed for the FTO film exposed to the hydrogen plasma for 5 min. For further exposure to the plasma, the chemical reduction became prominent and resulted in deterioration of the electrical and optical properties of the film. XPS analysis revealed that the chemical reduction of SnO2 to Sn metallic state occurs on the surface region. It was found that the defects formed by hydrogen plasma act as recombination centers at the interface between FTO electrode and p-layer of a-Si solar cells. This phenomenon resulted in the deterioration of the cell performance. The averaged conversion efficiency (6.82%) of the cells on pristine FTO hydrogen substrate was decreased to 5.81% for the cells on FTO treated for 5 min, which is mainly attributed to the decrease in short-circuit current density.

생체분해성 안과제형의 안구내흡수정도와 안독성

민병무,김용백,박근성,송규상,양준묵,이성복,조항진,길숙종,김승영,김학용 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1

An improved retinal tack can be used to fix the retina in complicated retinal detachment and proliferative vitreoretinopathy. We used the retinal tack made by biodegradable polyglycolic acid, polylactic acid and copolymers. The tacks with polyglycolic acid were placed in the retina the right eyes of 10 rabbits as group 1, with polylactic-polyglycolic acid copolymers as group 2 in each left eyes. We examined the absorption rates and degree of intraocular inflammation at 1 day, 1, 2, 4, and 8 weeks and compared both eyes. The tacks were absorbed with time in both eyes, but more rapid in copolymers. And there was no inflammation in both eyes. Now, this study will be a base on the drug delivery system in intraocular pharmacological and surgical management.

생체분해성 고분자를 이용한 사시수술용 제형개발 및 효용성에 대한 연구

민병무,김용백,김승영,김창식,박근성,길숙종,조항진,이성복,노승무,송규상,강대영,조준식,양준묵,정경수,최선웅,이진호,김학용,인현빈 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1

A new device, muscle clamping system was developed to facilitate exact quatifying technique A strabismus surgery, and reduce the risk of complications. The device is composed of a lower fixing body with three jaws and an upper supporting body. They are used to clip an extraocular muscle and fix it to the sclera with a single bite. Superior rectus recession on 16 rabbit eyes were performed with this new device. Conjunctival injection, muscle adhesion strength, and light microscopic findings were examined at 1, 2, 4 and 8 weeks postoperatively. The Conjunctival injection were minimal, adhesion power ranged from 420 to 600 gram gravity, which is sufficient in withstand the normal pull of human extraocular muscle. In microscopic exam, some Inflammatory cells and fibrosis were found. The new device was technically easy, fast, and accurate, so it may be useful in stabismus surgery.

돈육의 지방산과 아미노산 조성 및 관능 특성에 미치는 미생물제제 및 고구마 사일리지 급여 효과

진상근,김일석,송영민,박기훈,정기종,김동훈,이정일 진주산업대학교 산업과학기술연구소 2006 산업과학기술연구소보 Vol.- No.13

3원교잡종(LY×D) 돼지를 이용하여, 60일 동안 미생물제제 K를 3% 급여한 A 처리구와 O를 3% 급여한 B 처리구 및 가고시마흑돼지에게 10% 고구마 사일리지를 급여한 C 처리구로 각 처리구별로 30두씩 공시하여 사양 시험 후 돈육의 지방산, 아미노산 조성 및 관능적 특성에 미치는 효과를 분석하였다. 가열육의 관능검사에서는 B 처리구가 다른 처리구들에 비하여 유의적으로 높은 값을 보였다(p<0.05). 처리구 간에 지방산 조성 변화를 보면 palmitic과 palmitoleic acid 함량은 C 처리구가 다른 처리구들에 비하여 유의적으로 높았다(p<0.05). Aspartic, threonine, serine, glutamic, isoleucine과 phenyl alanine 함량은 C 처리구가 다른 처리구들에 비하여 유의적으로 높았다(p<0.05). Proline, alanine, cystine, valine, methionine, leucine과 histidine 함량은 B 처리구가 다른 두 처리구들에 비하여 유의적으로 낮은 아미노산 함량을 보였다(p<0.05). A total of 90 pigs were used to investigate the effect of feeding microbes and sweet potato silage on physico-chemical characteristics of pork loin. About 60 kg pigs were randomly alloted into one of three experimental diet groups (A: Supplemented with 3% K microbe; B: Supplemented with 3% O microbe; C: Supplemented with 10% sweet potato silage). Pigs were slaughtered at approximately 110 kg live weight and fatty acid, amino acid and sensory characteristics were measured in pork loin. In cooked meat, sensory evaluation was significantly higher in B compared to other treatments (p<0.05). The palmitic and palmitoleic acid content of C treatment were significantly higher than those of other treatments (p<0.05). In amino acid composition, aspartic acid, threonine, serine, glutamic acid, isoleucine and phenyl alanine level were significantly higher in C treatment compared to other treatments (p<0.05).

원발성 조기 위 소세포암

송근영,강길,박정희,김경종,민영돈,박치영,임성철 朝鮮大學校 附設 醫學硏究所 2002 The Medical Journal of Chosun University Vol.27 No.2

Gastric small cell carcinoma(SCC) is defined as poorly-differentiated neuroendocrine tumor of the stomach, and their morphologic and biologic features arc similar to those of the lung. It is known that this tumor has poor prognosis even in early pathologic stage, It acounts for only 3% of all gastrointestinal SCC. that has been reported only 33 cases outside and 6 cases inside of the comitiy. Most of these reports are related to advanced gastric SCC. as pathologic stage IIIb or IV. This report describes a case of early gastric SCC. pathologic stage Ib.

우리나라 대학교 관광관련 전공 재학생의 교육기대수준에 관한 연구 : 6개 대학교 재학생을 중심으로 : 강릉대학교, 경주대학교, 세종대학교, 숙명여자대학교, 순천향대학교, 한양대학교

최영민,이성근 한국문화관광학회 2001 문화관광연구 Vol.3 No.2

The main aim of this paper is to examine education expectation level of students majoring culture and tourism at universities in Korea. From the previous studies, Authors drew three general factors of educations of students (knowledge/humanity/ professional way). This study identifies the relation between three education factors mentioned and education environment of students(year/ sex/ major operation system). The data were collected from survey questionnaires on six universities for 3 month from late March to early July 2001. The empirical test is focused on discovering following points; - the efficiency of actual education operation system of universities - the differences of education expectation according to different academic year/ sex - the comparison of characteristics related to education expectation of university students

골유착성 치과 임플란트의 성공률에 대한 임상적 연구

김영석,이동근,민승기,이준,문철 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.2

The purpose of this study is to review the prognosis of the endosteal osseointegrated dental implants placed in the total and partial edentulous area of mandible and maxilla and to suspect the possible causes leading to failure. 301 osseointegrated dental implants that had been inserted between 1992 thru 2000 were followed up for over one year (average follow up : three years) in function. Medical records and radiographs included CT were evaluated and analyzed by the overall success rate, gender and age factor, general disease, implant fixture length and diameter, surface status of implant, bone density, and the stage of removal. Chi squire test was used statistically. Of the 301 osseointegrated dental implants, 18 dental implants (6.0%) were removed and cumulative survival rate was 94%. No significant difference in the failure rate were found between male (5.4%) and female (6.5%). The failure rate were 8.0% in the fifties, 7.3% in the forties, 5.2% in the thirties, 4.6% in the sixties. Patients who had systemic disease were highly related with failure rate (25%), and cumulative survival rate was 75%. Success rate was the highest in the premolar area than anterior and molar area (p<0.05). The failure rate was highest in the D4 bone (12.5%). High failure rate was found in the wide diameter implant (9.7%) and 7∼9㎜ short implant (12.5%). No significant difference in the failure rate were found between implant surface condition. Stages of removal were pre-prosthetic (16 implants) and post-prosthetic (2 implanrs) stage. The failure rate in the conventional technique was 5.1%, 19.1% in the GBR, 10% in the sinus lifting. Marginal bone resorption around the implants were found 0.15㎜ in the 3 months. 0.4㎜ in the 6 months. 0.71㎜ in the 1 year, 0.9㎜ in the 2 years and 1.06㎜ in the 3 years.

식이 오일과 토코페롤 급여가 돈육의 지방산, 아미노산, TBARS, VBN 및 관능적 품질에 미치는 영향

진상근,김일석,송영민,하경희 한국동물자원과학회 2003 한국축산학회지 Vol.45 No.2

우지가 5% 첨가되어 있는 일반적인 비육후기사료를 급여한 돈육(C), 우지 함량 중 2%를 들깨유로 대체 급여한 돈육(T1), 들깨유 2%에 비타민 E를 250ppm 첨가한 돈육(T2), 오징어유 2%를 대체 급여하 돈육(T3), 오징어유 2%에 비타민 E를 첨가 급여한 돈육(T4), CLA를 2% 대체 급여한 돈육(T5)의 육질특성을 조사한 결과는 다음과 같다. 지방산 조성에 있어서 오일간에는 T5가 다른 세 처리구들(C, T1, T3)에 비하여 SFA와 EFA는 높은 반면 UFA, MUFA, UFA/SFA MUFA/SFA는 낮았다. 총아미노산 함량은 오일간에는 T3가 다른 세 처리구들 (C, T1, T5)보다 높았으며, 동일한 오일에서는 비타민 첨가에 따라 높게 나타났다. TBARS의 경우 오일간에는 C와 T1에 비하여 T3와 T5가 높았고, VBN은 C<T1<T3<T5 순이었으며, 총세균수, 유산균수 및 대장균군의 경우 오일간에는 차이가 없었다. 신선육의 관능평가에서 전체적인 기호도는 C와 T1에 비하여 T3와 T5가 낮게 나타났으며, 가열육의 관능평가에서 경도는 T3가 다른 세 처리구들(C, T1, T5)에 비하여 낮아 전체적인 기호도는 높았다. TBARS, VBN, 총세균수, 유산균수, 대장균군, 신선육 및 가열육의 관능평가에서 동일한 오일에서 비타민 첨가에 따른 차이는 없었다. 이상과 같은 결과를 요약해 볼 때 우지 대신 들깨유와 오징어유를 첨가 급여시에 육질에는 뚜렷한 차이가 없었으나 비타민 첨가급여로 아미노산 함량이 증가되는 등 육질개선에는 다소 영향을 미치는 것으로 나타났다. Subjective pork quality was determined on the six groups of the following treatments. Meat samples were obtained from pigs which had been fed with finishing pig diets containing 5% beef tallow(C), 3% beef tallow and 2% perillar seed oil(T1), 250ppm vitamin E(α-tocopheryl acetate) in T1(T2), 3% beef tallow and 2% squid viscera oil(T3), 250ppm vitamin E in T3(T4), 3% beef tallow and 2% CLA(Conjugated linoleic acid, T5). In the fatty acid composition, SFA(Saturated fatty acid) and EFA(Essential fatty acid) were higher in T5 than in the rest of three treatments such as C, T1, T3 groups, while UFA(Unsaturated fatty acid), MUFA(Monounsaturated fatty acid), UFA/SFA, MUFA/SFA were low. The total content of amino acid in the T3 were higher those for the rest of rest of C, T1, T5 the content for vitamin added treatment(T2, T4) groups higher than non treated one. T3 and T5 showed higher TBARS(Thiobarbituric acid reactive substance) values than the C and T1 groups VBN(Volatile basic nitrogen) values were higher in the order of T5>T3>T1>C. There was no difference in total plate counts, number of lactic acid bacteria and number of E. coli. In sensory property, the C and T1 showed a higher acceptance than the T3 and T5. In cooked meats, the T3 showed a lower hardness than that of control(C), T1 and, with a higher acceptance. In TBARS, VBN, total counts, lactic counts, and E. coli counts sensory test of cooked meat and raw meat, there was no significant difference between vitamin supplement groups within each oil treatment.

고주파 마그네트론 스퍼터링 방법에 의해 MgO(100) 기판위에 증착된 (Pb, La) TiO_3 박막의 제작과 특성연구

張志根,張鎬廷,金敏寧,嚴于鎔 단국대학교 1995 論文集 Vol.29 No.-

Pyroelectric (Pb, La) TiO_3 (PLT) thin films have been prepared on Pt coated MgO(100) substrate by RF magnetron sputtering method in an atmosphere of mixed gas of Ar and O_2. PLT file deposited at 580℃ showed perovskite single phase with prominent C-axis orientation perpendicular to the substrate surface. The full width at half maximum (FWHM) of the PLT film was 0.45 degree indicating good crystallinity. From the RHEED observation, the PLT film showed spotty pattern, indication a single crystal phase with rough film surface. The relative dielectric constant(ε_r) and dielectric loss(tanδ) of the perovskite PLT film deposited at 580℃ were 75 and 0.006 at 1kHz, respectively. From the hysterisis loop analysis using sawyer-tower circuit, the remanent polarization(P_r) and coercive field(E_c) were about 10μC/㎠ and 160kV/㎝, respectively.