강아지의 후두화학반사에 대한 실험적 연구

박한규,김광문,홍원표,김영호,김명상,김동영 대한이비인후과학회 1999 대한이비인후과학회지 두경부외과학 Vol.42 No.12

수소저장합금의 제조기술과 특성평가에 관한 연구

김광배,山川宏二,홍준표 한국항공대학교 1994 論文集 Vol.32 No.-

본 연구의 목적은 수소저장합금의 합금설계, 열처리방법과 특성평가를 연구하는데 있다. 시편은 플라스마 아크로로 용해한 후 1100℃에서 15시간 균질화처리한 후 분말로 제조해서 사용하였다. 수소저장 및 방출실험은 P-C-T 곡선을 통해서 평가하였다. 평가결과 Fe-Ti합금에 소량의 Mn을 첨가한 합금이 수소저장 및 방출 속도가 우수했고 수소활성화 속도도 양호했다. Fe-Ti-Mn 합금이 주로 사용되는 수소저장용 용기 및 열교환기등에 사용이 가능하다고 사료된다. The purpose of this study is fabrication method, alloy design, heat treatment and hydriding reaction, were studied on the hydrogen absorbing alloy, In case of the specimen which were held at 1100℃ for 15hr after melting in the plasma are furnace. Hydriding reaction of hydrogen absorbing alloy by Pressure-Consentration-Temperature(P-C-T_ curve, was investigated. When a small amount of Mn is Substituted for Fe in FeTi alloy, hydriding reaction rate were increased significantly. And the hydriding characteristics of the Fe-Ti-Mn alloy showed the best result at P-C-T curve.

三寶寺刹의 造景樹木 植栽現況에 관한 硏究

金南喆,洪光杓 동국대학교 사찰조경연구소 1992 寺刹造景硏究 Vol.1 No.-

This study was to analyze the planting status of woody landcape plants of three-treasure temples in Korea, Tongdo-sa, Haein-sa, Songgwang-sa, with the purpose to provide the fundamental informations which can be used to the landscape architecture of traditional or morden temple. The results obtained are as following ; 1. Landscape woody plants species of three temples was 92 species. Tongdo-sa had 58 species, 52 species in Songgwang-sa, 51 species in Haein-sa each. 2. The same species among these temples was 21 species. 3. The rate of the native species to the introduced species was 8:2.

압력에 따른 지르칼로이의 수증기내 고온산화

김광표,박광헌 慶熙大學校 材料科學技術硏究所 1998 材料科學技術硏究論集 Vol.11 No.-

To find the effect of pressure on the high temperature oxidation of zircaloy-4, an autoclave capable of measuring the degree of oxidation at high temperatures and high pressure was manufactured. The degree of high temperature oxidation of zircaloy-4 was measured at three different conditions, high pressure steam, high pressure Ar gas with small amount of steam, and 1 atm steam. All the measurements were done at 750℃. The oxide thickness is much thicker in high pressure steam, comparing to that in the 1 atm steam. And, the higher is the steam pressure, the thicker becomes the oxide. No effect was observed in the case of high pressure Ar containing small amount of steam. Many cracks exist on the surface of specimens oxidized at high pressure steam, which come from the enhanced tetragonal to monoclinic phase transformation due to high pressure steam. The enhanced oxidation seems due to oxide cracking.

Chitosan 및 Chitosan Lactate를 이용한 Glipizide의 서방형 제제설계

김상희,박승현,김하형,이광표 중앙대학교 약학연구소 1996 약학 논총 Vol.10 No.-

Glipizide(GPZ) is a second generation non-halogenated sulphonylurea hypoglycemic agent in maturity onset diabetes mellitus which stimulates the secretion of endogenous insulin from pancreatic β-cells. GPZ is almost completely absorbed with peak serum concentration being attained 1 to 3 hours after an oral administration. However, administration of GPZ at a high dose can occasionally induce the severe hypoglycemia, especially in the patients with renal impairment as well as impaired liver function due to some of the administered dose being excreted in the urine as unchanged drug and first-pass hepatic metabolism. Therefore, in order to develop an oral sustained-release preparation which reduces the side effect, chitosan and chtosan lactate were employed as a matrix for sustained-release tablet of GPZ in this experiment. Chitosan is a natural, biocompatible and biodegradable polymer, showing extrmemly low toxicity and it has been used as a vehicle for sustained felease preparations of drugs. Chitosan and chitosan lactate tablets of GPZ were prepared by directed compression using Hydraulic Lab. Press. at 340kg/cm^2 for 30sec. The tablet formulation of GPZ with chitosan alone ded not show sustained release properties at any concentrations(30-80%) of chitosan, but the release of GPZ from chitosan tablet containing citric acid shiowed prolonged characteristics. Chitosan readily forms a gel at lower pH, but shows poor gel-forming ability at higher pH. The effect of contents of chitosan lactate(10, 30 and 50%) or GPZ (5,10, 30 and 40%) on GPZ release profiles was studied. As the contents of chitosan lactate or GPZ increased, the release of GPZ decreased. And chitosan lactate showed sustained release properties even at lower concentration. In general, on the basis of dissolution kinetics, the release of GPZ from chitosan and chitosan lactate matrix tablet were followed Higuchi's square root of time equation and Bambe's equation. Therefore in conclusion, it might be possible to design the sustained release formulation of GPZ using chitosan and chitosan lactate.

터널汚染度와 그 影響因子에 關한 硏究

金光洙,鄭長杓 慶星大學校 環境問題硏究所 1992 環境硏報 Vol.2 No.1

In this study, air poillution level (SO₂NOx CO THC) in T-tunnel and its influencing factors; the concentrations of air pollutants, meteorological factors(wind speed, direction, relative humidity etc.), traffic volurr.e, velocity of vehicle in T-tunnel, were measured during December in 1990 and November in 1991 to investigate the pollution level and the future (2000yr) concentration of each pollutant in T-tunnel by statistical prediction model. Results obtained in this study were as follows. 1. The minimum, maximum, mean concentration of each pollutant, SO₂ NOx CO THC showed 0.032,0.260, 0.129± 0.057, 0.910, 2.315, 1.650±0.317, 6.9000, 11.4000, 7.603±2.067 and 4.980, 9.901, 7.754±1.417ppm respectively. Among them, the concentrations of SO and CO satisfied underground space environmental standards, concentration of MO exceeded that stadrd. 2. Correlatiojnn coefficients between SO₂, NOx, CO, THC concentration and each of the influencing factors, rvalue was appeared as 0.032-0.66, 0.14-0.44, 0.11- 0.79, 0.18-0.63. But coefficient of determination of multi-regression analysis, R²value was appeared as 0.54, 0.48, 0.93, 0.78, respectively, and each was proved to have a significant meaning in statistical analysis. 3. Multi-Regression-Equations of SO₂ NOx CO THC concentrations obtained in this study, were as follows Yso₂= -0.08639 + 6.266E- 05X₂+ 3.586E- 03X₄- 0.02533X7 Ynox= -0.92335 + 3.970E- 04X₂+ 0.33168X6 Yco = - 5.47869 + 2.566E- 03X₂+ 0.91038X₃- 0.1295X₄+ 0.39637X5 Y THC = -1.32104- 0.05092X₁+ 0.16210X₃+ 0.10172X₄+ 1.60304X5 4. The concentrations of SO₂, NOx, CO, THC in 2000 year were predicted as 0.44, 3.57, 21.41 and 11.07 ppm. 5. Judgig from the results of this study, comprehensive and proper tunnel pollution control programs and plans should be established.

都市固形廢棄物의 堆肥化 前處理工程上의 最適條件에 관한 硏究

金丙泰,李光杓 대진대학교 1993 大眞論叢 Vol.1 No.-

The present study is investigated physical composition and chemical quality of urban solid wastes in Korea which are various compounds and severe seasonal variance, and it is showed optimum condition of pretreatment for composting, the result are following. 1. Optimum range of C/N ratio is 35-45 O₂ consumption and CO₂ production is measured to judge the degree of degradation. The degradation rate of C / N ratio 35 and 45 samples are 3 times higher than 10 and 25 samples. 2. Optimum range of water content is 50-70%. Because of the different quality of initial sample and laboratory condition, the samples with various C/N ratios are showed different optimum moisture content. 3. For the purpose of maintaining optimum condition of pretreatment, the bulking agent is selected properly, and also, it must be considerd the regional and seasonal producing character for the selection of the bulking agent.

폴리머 콘크리트를 이용한 전기,통신관련 제품 개발에 관한 연구

김남호,김광호,한욱표 강원대학교 석재복합신소재제품연구센터 1996 석재연 논문집 Vol.1 No.-

본 연구에서는 고성능의 폴리머 콘크리트를 이용하여 현재 콘크리트나 강재로 만들어져 있어 내구성 및 시공에 문제가 있는 전기, 통신 설비제품을 새롭게 개발하고자 개발타당성을 검토하였다. 폴리머 콘크리트가 전기, 통신설비의 측면에서 갖는 장점은 높은 절연성, 불투수성, 내구성, 사용의 용이성 등이 이점이라고 하겠다. 본 연구에서 조사 연구한 바로는 전기, 통신설비와 관련한 기존 콘크리트 구조물의 대부분을 대체할 수 있으리라 여겨지며 특히 전기 설비에서 필요로 하는 애자, 금구등과 같은 절연체의 대체가 유망하리라 여겨진다. In this research works, we considered and verified the feasibility for developments of the electric and telecommunication equipments using polymer concrete, which have some demerits until now because of using concrete or steel. In the view points of developmetns of electric and telecommunication equipments, polymer concrete has some advantages, such as high insulating characteristics, high strength, convenience for handling. Therefore, polymer concrete can replace most of all the electric and telecommunication equipments made by conventional concrete, especially it can be a promising material for high voltage insulator in electrical power industry.

치수 치근단 병소의 전구 위험요인으로서의 제 2 형 당뇨의 역할에 관한 소고

김진희,배광식,서덕규,홍성태,이윤,홍삼표,금기연 大韓齒科保存學會 2009 Restorative Dentistry & Endodontics Vol.34 No.3

Diabetes Mellitus (DM) is a syndrome accompanied with the abnormal secretion or function of insulin, a hormone that plays a vital role in controlling the blood glucose level (BGL). Type 1 and 2 DM are most common form and the prevalence of the latter is recently increasing. The aim of this article was to assess whet her Type 2 DM could act as a predisposing risk factor on the pulpo-periapical pathogenesis. Previous literature on the pathologic changes of blood vessels in DM was thoroughly reviewed. Furthermore, a histopathologic analysis of artificially-induced periapical specimens obtained from Type 2 diabetic and DM-resistant rats was compared. Histopathologic results demonstrate that the size of periapical bone destruction was larger and the degree of pulpal inflammation was more severe in diabetic rats, indicating that Type 2 DM itself can be a predisposing risk factor that makes the host more susceptible to pulpal infection. The possible reasons may be that in diabetic state the lumen of pulpal blood vessels are thickened by atheromatous deposits, and microcirculation is hindered. The function of polymorphonuclear leukocyte is also impaired and the migration of immune cells is blocked. leading to increased chance of pulpal infection. Also, lack of collateral circulation of pulpal blood vessels makes the pulp more susceptible to infection. These decrease the regeneration capacity of pulpal cells or tissues, delaying the healing process. Therefore, when restorative treatment is needed in Type 2 DM patients, dentists should minimize irritation to the pulpal tissue under control of BGL. 당뇨(Diabetes Mellitus)란 혈당을 조절하는 인슐린의 분비나 기능에 장애를 야기하는 질환으로 인슐린 의존성 여부에 따라 제 1 형과 제 2 형으로 분류된다. 본 종설은 최근 증가 추세에 있는 제 2 형 당뇨가 치수 치근단 병소의 병인 과정에 전구 위험 요인으로 작용할 수 있는지를 평가 하고자 문헌고찰을 통해 당뇨의 병인 과정에서 특징적으로 나타나는 혈관 합병증에 관해 알아보고, 부가적으로 제 2 형 당뇨 쥐 모델에서 인위적인 치수감염 후 얻은 치근단 조직의 조직병리학적 분석을 시행하였다. 조직학적 관찰 결과 제 2 형 당뇨 쥐에서 대조군에 비해 치수 치근단 병소의 크기가 증가하였고, 치수 염증 반응도 심하게 나타난 것으로 보아 당뇨 자체가 숙주를 감염에 취약한 상태로 만드는 전구 위험요소로 작용하였음을 알 수 있었다. 이러한 이유로는 첫째, 당뇨 시 전반적으로 나타나는 혈관 내 죽상 침착(atheromatous deposits)에 의해 혈관 내벽의 두께가 두꺼워져 미세 순환의 장애는 물론 탐식 세포의 기능 저하, 면역 세포의 혈류 이동이 차단되어 치수 감염 시 쉽게 치근단 병소로 이환될 가능성이 높고, 둘째 치수 혈관에서 특징인 측부 순환(collateral circulation)의 부재에 따른 살균성 다형핵 백혈구의 활동 억제를 포함한 미세 혈관계의 취약성으로 인해 치수 조직의 재생능이 저하되어 추가적인 감염원의 공격에 대한 방어 및 치유 저하를 더욱 심화시키기 때문인 것으로 사료된다. 따라서 제 2 형 당뇨 환자의 수복치료 시 치과의사는 당뇨 조절 하에서 치수 조직의 자극을 최소화하기 위한 세심한 처치가 필요하다.

유색미에 관한 연구 : Ⅲ. 유색미 유망계통에 대한 주요 생육 특성

김광수,최윤표,김선택,최현구,정종태,김보경,유지홍,이희봉 충남대학교 농업과학연구소 2007 농업과학연구 Vol.34 No.2

국내외 유색미 수집종을 돌연변이원에 의해 유기된 우수 계통과 수집종간 상호교배에 의해 선발된 CNU 20계통을 파종하여 얻어진 주요 작물학적 특성을 살펴보면 다음과 같다. 1. 간장은 유색 메벼인 CNU126 계통이 대조품종인 동진벼와 같이 가장 컸고 메성인 CNU 128계통에서 가장 작았다. 2. 주당 분얼수는 CNU3, CNU50. CNU56, CNU112 계통에서 가장 많았고 대조품종과 CNU 128 계통에서 10개 미만으로 가장 적게 나타났다. 3. 수장은 육성 계통 중 CNU88 계통에서 가장 길었으나 대조구보다 짧고, 육성계통 중에서는 CNU 126 계통이 가장 짧았다. 4. 주당 영화수는 대조구인 동진벼보다 CNU50 계통에서 2배 이상 많았고, CNU158 계통에서 가장 적게 나타났다. 5. 천립중은 CNU113 계통에서 30g이상으로 대조구와 같이 가장 무거웠고, CNU128 계통에서 20g으로 가장 적었다. 6. 주당 수량은 대조구의 26.6g에 비해 CNU50, CNU112 계통에서 두배정도 높았고, CNU128, CNU158, CNU200 계통에서 가장 낮게 타나났다. Aims of this study were carried out to develop the useful lines induced from mutation and pedigree breeding methods among the collected genetic resources from national and domestic areas. In this study, Stem height of CNU126 line and check among them were high, while CNU128 was lower than other lines. Spiklet length of CNU88 was longer, but that of CNU126 was shorter than check. Number of spiklets per plant of CNU50 among lines have twice time than check. 1,000 grains weight of CNU113 was higher than check. In yield per plant, CNU50 and CNU112 were higher than check, Dongjinbyeo.