가야산 국립공원일대의 식생 및 식물상 연구 : 단지봉 지역을 중심으로 Especially on the Danji-bong Area

박광우,권영한,최경,오승환,김동갑,김주환 한국환경생물학회 2005 환경생물 : 환경생물학회지 Vol.23 No.1

본 조사지역인 가야산국립공원은 지리학적으로는 북위 35?5′00″~35?9′30″, 동경 128?2′30″~128?09′30″에 위치하고, 행적구역상으로는 경상남도의 합천군과 거창군, 경상북도의 성주군, 고령군에 걸쳐 있으며, 총면적은 57.81 km꼬?이른다. 가야산은 우리나라 기후지역상 온대남부에 위치하고, 식물구계학적으로는 남부아구에, 식생구계학상으로는 냉온대에 속하는 것으로 알려져 있다. 또한, 전체면적의 약 82.5%가 해발 600m 이상이며, 1,000m이상이 약 10.3%에 해당된다. 가야산의 해인사-극락골-토신골 지역은 잘 보존된 소나무림이 우점하고 있고, 부분적으로 노각나무가 산생하는 것이 관찰되었으며, 해인사-진대밭골-두리봉 지역은 계곡에는 소나무와 졸참나무가 고지대에는 신갈나무 등이 부분적으로 군락을 형성하고 있었다. 또한 남산제일봉과 북사면은 각각 등산로와 임도가 형성되어 있어 소나무와 졸참나무, 신갈나무 등이 혼재된 양상을 나타내었고, 백운동계곡 주변은 다른 사면과 달리 식생의 발달정도가 소나무와 관목위주로 매우 단순했다. 특기할만한 점은 상왕봉 주변에서 흰참꽃, 설앵초, 네귀쓴풀, 백리향, 솔나리, 구름송이풀 등의 희귀 또는 고산성 식물들이 분포하는 것이 확인되었다. 가야산국립공원지역에 분포하는 양치식물 이상의 관속식물을 대상으로 조사한 결과 91과 268속 373종 1아종 75변종 12품종 4잡종으로 총 465분류군이 조사 확인되었으며, 이는 우리나라 관속식물 4,071 분류군의 11.4%에 해당되었다. 한국특산식물은 11과 15속 15분류군으로 조사지역내 분포하는 465분류군중 약 3.2%이며. 식물구계학적 특정식물은 17과 21속 25분류군으로 이는 가야산 소산식물 465분류군의 5.4%이었고, 조사지역에 분포하는 귀화식물은 5과 7속 7분류군으로 우리 나라전체 귀화식물종 177종류의 4%이다. 또한 가야산 단지봉(1,028.5m)에서 새로 발견된 산간습지 (forested wetland)와 자란초 자생 군락지에 대해 식생 및 층위별 종조성을 토대로 현존 식생 구조를 분석하였다. This study aims to investigate the flora of Mt. Gaya National Park, especially focused on the forested wetland vegetation of Danji-bong area. The flora of Mt. Gaya was investigated from April in 2003 to October in 2004. Vascular plants of this area consist of total 465 taxa, 4 hybrids, 12 forma, 75 varieties, 1 subspecies, 373 species, 268 genera, 91 families. It corresponds to 11.4% of totally 4,071 taxa appeared in Korea. Korean endemic plants were composed 11 families, 15 genera, 14 species, 1 variety and totaling 15 taxa. And also actual vegetation structures were analyzed the newly founded forested wetland and natural population Ajuga spectabilis on the Danji- bong area using the vegetation and the species composition by tree layer.

하수슬러지의 유동층 소각 특성

한근희,박영성,류정인 대전대학교 산업기술연구소 1999 산업기술연구소 論文集 Vol.10 No.2

The incineration characteristics of sludge sample were investigated in a fluidized bed incinerator(φ 0.2m, 3.0m height). The sewage sludge with heating value of 2480kcal/kg, and 22% moisture content was used as sludge sample. The characteristics of sludge incineration in terms of combustion efficiency, axial temperature profile and heavy metal analysis of sludge and ash were studied. The combustion efficiencies were found to be no less than 99%, which indicates that the fluidized bed incinerator can be very effectively applied to sewage sludges. It was also found that the heavy metal components were remained in the sludge ash after incineration due to the relatively low combustion temperature of the fluidized bed incinerator.

유동층내 설치된 수평관의 마모 특성

한근희,박영성,류정인 대전대학교 산업기술연구소 1998 산업기술연구소 論文集 Vol.9 No.2

유동층내에 설치된 수평관에 대한 마모실험을 수행하였다. 유동층 연소로의 크기는 단면적 0.15×0.2m이며 높이는 1m에 해당된다. 유동층내 유동물질로는 모래와 무연탄회재를 사용하였으며 충진층의 높이는 0.45m를 적용하였다. 마모실험용 시편은 아크릴 관이 사용되었으며 위치는 수직방향으로 15, 30, 45cm 위치에 세 개씩 그리고 60cm 위치에 1개를 설치하였다. 유동화속도, 수직높이, 층물질 종류에 따른 마모속도와 관의 원주방향에 대한 마모특성을 고찰하였다. 실험결과 마모속도는 유동화속도와 관의 수직높이가 증가할수록 늘어남을 보였으며, 시계방향으로 4∼8시간, 특히 5∼7시간 방향으로 커다란 마모율을 나타냈다. The erosion characteristics of horizontal tubes immersed in a fluidized bed cold mode combustor were investigated. The combustor has a cross sectional area of 0.15×0.2m and a height of 1m. The anthracite ash and river sand were used as a bed material. The static bed height was 0.45m. The wear specimens were made of acrylic tube. Test tubes were located inside the bed with three tubes in a low at 15, 30, 45cm and with a single tube at 60cm above distributor plate, respectively. The test was performed to investigate the effect of fluidization velocity, distance above distributor plate on the erosion rate, and the erosion trend of tube surface with radial direction. The result shows that the erosion rate increases with fluidization velocity, with distance above the distributor plate. The trend with radial direction shows severe erosion at the 4-8 o'clock clockwise compare to other area, especially 5 and 7 o'clock clockwise.

1, 2 차원 수치해석에 따른 기존 세굴심 산정식 편차 산정

최한규,박태현,이영섭 江原大學校 産業技術硏究所 2008 産業技術硏究 Vol.28 No.B

This study tried the 1st, 2nd dimensional numerical analysis according to the pier's shape, size and installing method in order to compare the depth of scour calculation method using the variables calculated by using the 2nd dimensional numerical analysis with the calculated depth of scour value by using the calculated variables by using the 1st dimensional numerical analysis. And then verified the problems occurring when the depth of scour is calculated by using the calculated values by using the 1st dimensional numerical analysis, as calculating the deviation depending on it.

치과용 임플란트로 적용을 위한 스테인리스강 표면의 Ti/TiN film 증착

최한철,고영무,백대화,박영록,박지윤 대한치과기재학회 1999 대한치과재료학회지 Vol.26 No.1

A study on Ti/TiN film coating on stainless steels for application as dental implants have been investigated. The stainless steels containing Ti were solutionized 1050℃ for 1hr. Then the surface was deposited with Ti and TiN by using electron-beam deposition method. The deposited layer and microstructure were analyzed by using XRD, WDX, XPS and SEM. The hardness and wear resistance of deposited surface were examined and corrosion behavior were investigated by using potentiostat, XPS and SEM. The results were as follows: 1. Some defects showed on the deposited surface, such as crater and microdroplet, and surface roughness increased in all specimen after TiN deposition. 2. Ti/TiN deposited layer showed columnar structure which nucleated and grew on the special crystalline direction and plane: Ti/TiN layer TiN(220) and TiN(200). 3. The hardnesses of Ti/TiN layer was higher than that of TiN layer. 4. In case of stainless steel containing high Ti content, Ti/TiN layer showed better wear resistance than that of TiN layer. 5. Pitting potential of TiN film in NaCl solution increased as Ti content increased, but pitting potential of Ti/TiN film were not affected by the Ti content of substrate. Pitting potential of Ti/TiN film showed high value than that of TiN film in NaCl solution. The number and size of pits were apparently decreased by Ti/TiN film deposition on the stainless steel.

기관골 신생증 1예

오영상,이은우,정종혁,문승원,김수현,김동한,양혁승,박정환,박경옥,강성수,이영직 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.2

Tracheobronchopathia osteoplastica is a rare disorder of unknown cause characterized by the projection of numerous bony or cartilaginous submucosal nodules into the tracheobronchial lumen with sparing of the posterior membranous portion of tracheobronchial tree. In the past, most of the cases were diagnosed as secondary finding at autopsy. Nowaday, the key component of the evaluation is flexible fiberoptic laryngoscopy and bronchoscopy, which typically demonstrates irregular spicules of subrnucosal bone and cartilage projecting into the tracheobronchial lumen and causing various degrees of airway obstruction. A 45 years old man was visited Sunchon St. Carollo hospital due to discomfort on throat. We saw several nodules just below vocal cord via laryngoscope. The computed tomography revealed multiple small calcified nqdules on trachea and both main bronchi. Pathologic finding of bronchoscopic biopsy showed abnormal proliferation of bony and cartilagious nodules in the tracheal submucosa. These fingdings were consistent with tracheobronchopathia osteoplastica. We report here on a case of tracheobronchopathia osteoplastica with review of literature.

활성탄을 이용한 휘발성 유기화합물(VOCs-BTX)의 흡착특성

김한수,장효섭,박영성 大田大學校 環境問題硏究所 1998 환경문제연구소 논문집 Vol.3 No.-

Adsorption characteristics of volatile organic compounds(VOC) by activated carbon were investigated using a continuous generation system for VOC. As samples of VOC, benzene, toluene, and xylene were adopted. The pelletized activated carbon prepared by Hanil Green Tech. Company was used as a adsorbent. As operating variables, adsorption temperature(25∼45℃) and partial pressure of VOC(0.25∼22.5mmHg) were applied. Adsorption characteristics such as adsorption rate, adsorption equilibrium capacity, and breakthrough curve were studied. The experimental results show that the adsorption rate increases with increasing temperature and partial pressure. Also, the adsorption equilibrium capacity increases with increasing pressure. and decreases with increasing temperature.

Horseshoe Appliance를 이용한 III 급 부정교합의 치험례

홍한영,박재홍,최영철,김광철 大韓小兒齒科學會 2008 大韓小兒齒科學會誌 Vol.35 No.2

성장기 아동의 치열은 대부분 혼합 치열로,이 시기에는 유치 탈락 또는 계승치 미맹출로 인해 치열에 빈 공간이 많아 지고,계승치가 맹출되었다 하더라도 고정성 장치를 부착시키고 강한 호선을 적용시키기는 매우 어렵다. 이런 치료 진행의 문제점을 해결하기 위해 horseshoe 장치가 유용하게 사용될 수 있다. 이 장치는 치열에 빈 공간이 있는지의 여부에 관계없이 장치 제작이 가능하며,치열 상태와 무관하게 전 치열을 하나로 묶어준다. 그리고 구강내에 이미 맹출된 치아의 모든 치면을 피개하므로 치아의 정출과 회전이 발생하지 않으면서 악간 고무줄의 힘에 의해 치조골의 골개조가 상악과 하악 치궁에서 서로 반대 방향으로 유도된다. 경희대학교 치대병원 소아치과에 내원한 환아에서,Horseshoe Appliance를 이용하여 III급 부정교합에서 양호한 결과를 얻었기에 보고하는 바이다. In mixed dentition there exists many empty spaces in the arch due to eruption of permanent teeth and exfoliation of primary teeth. The empty spaces makes it difficult to apply fixed orthodontic appliances. Horseshoe Appliance can be used effectively at this stage, holding the whole dentition in one piece, It covers every surface of erupted teeth and prevents extrusion and rotation of single tooth. By using intermaxillary elastic force, remodeling of the alveolar bone is opposite in each arch. In patients who were treated with horseshoe appliance, forward growth of maxilla, labioversion of maxillary incisors and linguoversion of mandibular incisors were obtained. Minimum downward and clockwise rotation of mandible was shown, so increasing anterior facial height was minimized.

고정 흡착층에서 벤젠과 톨루엔의 단일 및 이성분 흡착특성

김한수,박영성 대전대학교 환경문제연구소 2001 환경문제연구소 논문집 Vol.5 No.-

The effects of various parameters, such as adsorption temperature, interstital velocity, concentration of adsorbates and sapect ratios(L/D) of the fixed bed, on the adsorption characteristics referring to single and binary component were studied in a fixed bed of an activated carbon. For the single component, the break point decreased with increasing the adsorption temperature, interstitial velocity and concentration of adsorbates. Interstitial velocity, concentration of adsorbates and adsorption temperature had considerable influence upon the MTZ and LUB that obtained through the breakthrough curves. An adsorption isotherm of benzene and toluene was determined with single component, Langmuir, Freundlich and Langmuir-Freundlich isotherm agreed with experimental data fairly well. For the binary component, the adsorption breakthrough curve of key component(toluene) was sigmoidal as in the case of the single component system. However, the breakthrough curve of non-key component(benzene) was entirely different from that of the single component adsorption process. The mageitude of roll up increased with increasing concentration of adsorbates and aspect ratio of the fixed bed, and decreased with increasing interstitial velocity.

동결속도제어에 의한 동결건조기 성능개선 및 동결건조품의 물리적 특성에 관한 연구

김정한,신영우,김민용,박기원,강정길 여수대학교 1998 論文集 Vol.12 No.2

It is essential to establish optimum operating condition in order to decrease freeze drying time and energy cost on freez-drying process. In this study freezing point, thermal condutivity and permeability of vapour on freeze-drying process of coffee solution were measured. The results of abtained were summarized as follows: 1) thermal conductivity were not affected by freezing rate but were increased with increasing concentration of coffee solution 2) permeability of vapour was increased with decreasing freezing rate and concentration of coffee solution These result suggested that freezing temperature of freeze-drying material must be determined through measuring freezing point of material for the purpose of saving energy cost and ahortening freezing time 1) thermal conductivity depend on solids porosity and was not concerned with size and shape of pore 2) permiability decrease with lowering freezing temperature beacuse radius of freeze drying layer was smaller and permiability decrease with higher concentration because of porosity was decreased