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 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.

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.

5종의 식물표면에서 분리한 Pseudomonas syringae의 빙핵활성

이영근,이정민 安東大學校 農業科學技術硏究所 1997 農業科學技術 硏究論文集 Vol.4 No.-

경상북도 안동시 안동대학교 인근에 자생하는 쑥, 냉이, 개나리, 벚나무 및 사과나무의 새싹표면에 서식하는 빙핵활성세균이 분리되었다. 이 세균현탁액의 supercooling point는 -4℃내지 -6℃였으며, 빙핵활성세균이 형태 및 생리적 특성을 조사한 결과 Pseudomonas syringae로 동정되었다. Ice nucleation active bacteria were isolated from the shoots or young leaves of altemisia princeps, Capsella brusa-pastoria, Forsythia koreana, Prunus sp. and Malus pumila var. ducissima nearby Andong National University, Kyeongbuk, Korea. The isolates were identified as Pseudimonas syringae based on their morphological and physiological characteristics.

노안수술후 각막형태검사 변화

박근성,고길환,김용선,이재림,민병무,최시환 충남대학교 의학연구소 2001 충남의대잡지 Vol.28 No.2

We prospectively analyzed the corneal topography of 26 eyes in 26 patients who had undergone scleral expansion for correcting presbyopia. We examined 26 eyes of 26 patients which were devided into 2 groups (mean age: 51 years, range 40-60 years) according to type of scleral expansion band, with computerized corneal topographic analysis system. Preoperatively and 5 times postoperatively (1day, 1week, 2weeks, 1month, 2months), quantitative descriptors of corneal topograpgy such as Sim K (simulated keratometry value), SRI(surface regularity index), and SAI(surface asymmetry index) were measured at each visit. The mean follow-up period was 43 days. Sim K of the operative eyes ranged from 0 to 2.5 (mean, 0.93) before operation, and mean 2.24 at postoperative 1 day in group Ⅰ. In group Ⅱ, Sim K was mean 2.20 at postoperative 1 day and decreased thereafter. SRI was from 0.54 to 1.39 and SAI was from 0.09 to 0.45 before operation. After operation, mean SAI was maximum at postoperative 2 week and mean SRI was maximum at postoperative 1 day and decreased thereafter. After two months, it became minimum. This study demonstrates that quantitative topographic change after scleral expansion for correcting presbyopia were great during first 1 week after surgery but this change diminished thereafter. Further long studies are in progress to evaluate the long term effects of this procedure.

갑상선 초음파검진의 유용성

배오근,김재권,강명순,조영익,김임봉,신유진,임성규,서민호 한국건강관리협회 2000 건협 Report Vol.3 No.-

산삼 배양액 급여가 돈육의 이화학적 특성에 미치는 영향

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

Berkshire를 이용하여 70일간 산삼 배양액 급여 시 육의 이화학적 특성에 미치는 영향은 다음과 같다. 산삼 배양액의 급여에 의해 육의 수분, 조단백, 조지방, 회분, pH, 가열감량, 콜레스테롤 함량, 육색, 조직감의 응집성과 검성, 포화지방산 및 불포화지방산의 비율은 차이를 보이지 않았다. 보수력, 지방색 L^(*)값, 지방산 중 linoleic acid(18:2), arachidonic acid(20:4), 필수지방산의 함량, 아미노산 중 threonine, glutamic acid, valine, isoleucine, leucine, histidine, lysine 및 총아미노산 함량은 산삼 배양액의 급여에 의해 감소하였다. 전단가, 조직감의 표면경도, 경도, 씹힘성, 지방산 중 stearic acid(18:0), oleic acid(18:1) 함량, 아미노산 중 serine, glycine, cystine, methionine, tyrosine 및 phenylalanine의 함량은 산삼 배양액의 급여에 의해 증가하였다. 본 연구결과를 종합하면 산삼 배양액의 급여는 돈육의 경도를 증가시키는 효과 외에 뚜렷한 이화학적인 차이를 나타내지 않았다. 이러한 이유는 급여된 산삼 배양액 내에 함유된 생리활성 물질의 함량이 낮고, 급여수준이 낮은 결과로 사료되어진다. A total of 60 pigs (Berkshire) were used to investigate the effect of dietary artificial culture medium of wild ginsengs (CMG) on physico-chemical characteristics of pork. About 60 kg pigs were randomly alloted into one of two experimental diet groups (C:commercial diet feed; T:commercial diet + 1 L CMG per day for 70days). Pigs were slaughtered at approximately 110 kg live weight, and chemical composition and physico-chemical characteristics were measured in pork loin. Moisture, crude protein, crude fat and ash were not significantly different by dietary artificial culture medium of wild ginsengs. Water-holding capacity was decreased by dietary artificial culture medium of wild ginsengs, while shear force was increased. However, pH, cooking loss and cholesterol contents were not significantly different between two different treatments. In color, L^(*) of fat was decreased by dietary artificial culture medium of wild ginsengs. Brittleness, hardness and chewiness were increased in dietary artificial culture medium of wild ginsengs group. In fatty acid, stearic acid (18:0) and oleic acid (18:1) were higher in dietary artificial culture medium of wild ginsengs group, whereas linoleic acid (18:2) and arachidonic acid (20:4) were higher in control group. In amino acid, serine, glycine, cystine, methionine, tyrosine and phenylalanine were higher in dietary artificial culture medium of wild ginsengs group, whereas threonine, glutamic acid, valine, isoleucine, leucine, histidine and lysine were higher in control group.

'퇴원설명문'에 의한 72시간내 부적절한 응급센터 재방문의 감소

박하영,심민섭,송형곤,송근정 한국의료QA학회 2005 한국의료질향상학회지 Vol.12 No.1

Background : Patients who were discharged from the emergency department(ED) may revisit. These patients are divided into two groups; one is expected scheduled condition, the other is unexpected condition. These patients of inappropriate revisits to the ED would be unsatisfied, difficult to make rapport and take legal action as a result of additional medical charges. The purpose of this study was to reduce inappropriate revisits to the ED with a new method which was developed by analyzing inappropriate revisits in 2002. Methods : This study was conducted in a tertiary hospital consisting of 1,278 beds. The most common cause of inappropriate revisits was the medical team's lack of explanation about a disease. Thus we decided that the effective method was to offer full explanations to patients to understand the clinical pathway of a disease. We made four types of stickers to explain most common 4 diseases in 2003. An emergency physician completed 'discharge explanation report' and explained it to patients in 2004. Results : In 2002 inappropriate revisited patients were 164, patients with four diseases were 79. During the same period of 2003, inappropriate revisited patients were 56 (-65.9%), four disease patients were 6 (-92.4%) and in 2004 inappropriate revisited patients were 52, four disease patients were 19. Causes of revisits were lack of explanation about a disease in 35 patients (44.3%) in 2003, and 5 patients (83.3%) in 2003, and 16 patients (84.2%). Conclusions : Application of 'explanation stickers' at discharge reduced inappropriate revisits from 34.5% in 2002 to 15.9% in 2003. Application of 'Discharge explanation report' by emergency physician reduced inappropriate revisits from 15.9% in 2003 to 13.5% in 2004. Reduction of inappropriate revisits elevated the quality of medical treatment, and decreased patients' dissatisfaction in ED.

FAH-전지의 효율파라미터에 대한 광세기 및 온도특성

장지근,김장기,김민영 단국대학교 신소재기술연구소 1991 신소재 Vol.1 No.-

위성전원용 태양전지로 사용할 수 있는 새로운 구조의 FAH-전지로부터 효율파라미터 특성이 입사 광전력의 세기(I=20∼1000 mW/㎠)와 온도 (T=0∼140℃)에 따라 어떻게 변화되는가를 측정하고 이 결과를 분석하였다. 일정한 온도(T=30℃)에서 광세기가 증가할 때 FAH-전지의 개방전압(V_oc)은 20∼200 mW/㎠ 범위에서 v_oc=0.66+0.067·log(I/20) [V]로, 200∼600mW.㎠ 에서는 V-oc=0.727+0.04·log(I/200) [V]의 관계로 증가하는 특성을 나타내고 600 mW/㎠ 이상에서는 0.75 [V]로 포화되었다. 충실도(F·F)는 100mW/㎠ 이하에서 F·F=0.815∼0.0858·log(I/20)으로, 300 mW/㎠이상에서는 F·F=0.65∼0.5164·log(I/300)의 관계로, 광세기에 따라 감소하는 특성을 보였다. T=30℃일 경우 전지의 효유(EFF.)은 100mW/㎠이하의 광세기에서 거의 일정한 값으로 나타나고(EFF.≒EFF_*ref=EFF.|I=100 mW/㎠) 300mW/㎠ 이상의 광세기에서는 EFF.=Eff_*ref·[0.9-0.412·log(I/300)]로 효율이 급격히 저하되었다. 또한 일정한 광세기(I=100 mW/㎠)에서 단락전류(I_se는 온도가 증가함에 따라 단조증가하며 T<30℃에서 dI_se/dT=0.0006 mA/℃로 나타났다. 개방전압의 감소율은 전체 측정온도 범위(T=0∼140℃)에서 dV_oc/dT=-0.002 V/℃로 나타났으며, 충실도(F·F)는 T=0∼20℃, 20∼90℃, 90∼140℃의 각 영역에서 -0.275%/℃, -0.1357%/℃, -0.1 %/℃의 율로 감소하였다. 전지의 효율은 T=30℃의 갑(EFF. |T=30℃=EFF.ref)을 기준할 때 T<20℃에서 EFF.=EFF.ref·[1-0.0034·(T-30)]의 관계로 나타나고 그 이하의 온도에서는 효율이 1.05·EFF.ref의 값으로 포화되는 현상을 보였다. The effect of light intensity(I=20∼1000mW/㎠) and temperature(T=0∼140℃) on the efficiency parameters of a new FAH-solar cell is exeprimentally and theoretically investigated n this paper. Under the constant temperature(T=30℃), the increase of light intensity gives the open circuit voltage(V_oc) varing with the relation of 0.66+0.067·log(I/20) [V] and 0.727+0.04·log[I/200] [V] in each range of I=20∼200[mW/㎠] and I=200∼600[mW/㎠]. The open circuit voltage is, however, nearly saturated to 0.75[V] above 600[mW/㎠]. The fill factor is decreased with the relation of 0.815∼0.0858·log[I/20] below 10[mW/㎠ and 0.65-0.5164·log[I/300] above 300[mW/㎠]. The conversion efficiency(EFF.) shows the constant value of EFF-*ref=EFF.|_I=100mW/㎠ below 100[mW/㎠], but decreases with the relation of EFF.=EFF_*ref·(0.9-0.412·log[I/300]) above 300[mW/㎠]. Under the constant light intensity(i=100mW/㎠), the increase of temperature gives the short circuit current increasing with the rate of dI_sc/dT=0.0225[mA/℃] below 30[℃], and dI_sc/dT=0.006[mA/℃] in the range of 30∼140[℃]. The open circuit voltage is decreased with the rate of dV_oc/dT=-0.002[V/℃] The fill factor is decreased with the rate of -0.275[%/℃], -0.1357[%/℃], and -0.1[%/℃] in the ranges of 0∼20[℃], 20∼90[℃], and 90∼140[℃], respectively. The conversion efficiency is decreased with the relation of EFF.=EFF_*ref'·[1-0.0034·(T-30)] above 20[℃], and saturated to 1.05 EFF_*ref' below 20[℃].