Valuation of ecosystem services in the organic carbon of the Pinus densiflora forest at Mt. Namsan, Seoul Metropolitan City

Lee, Eung-Pill,Lee, Soo-In,Jeong, Heon-Mo,Han, Young-Sub,Lee, Seung-Yeon,Park, Jae-Hoon,Jang, Rae-Ha,Hong, Youg-Sik,Jung, Young-Ho,Kim, Eui-Joo,Lee, Sang-Hun,You, Young-Han The Ecological Society of Korea 2019 Journal of Ecology and Environment Vol.43 No.4

Background: Standing biomass, litter production, rate of litter decomposition, amount of litter on forest floor, and amount of soil organic carbon distribution were investigated from March 2016 to November 2018 in order to evaluate the ecosystem value through organic carbon distribution in the Pinus densiflora forest at Namsan, Seoul Metropolitan City. Results: The amount of organic carbon in the Pinus densiflora forest was 261.09 ton C ha^-1 during the research period, and fixed organic carbon in plant through net photosynthesis was 3.2 ton C ha^-1 year^-1. The organic carbon in plant was 62.77 ton C ha^-1 (24.04%), in litter on the forest floor was 3.65 ton C ha^-1 (1.40%), and in soil was 194.67 ton C ha^-1 (74.56%). The value of plant, litter on forest floor, and soil organic carbon distribution were each 6,277,000 won ha^-1, 365, 000 won ha^-1, and 19,467,000 won ha^-1. The value per ton of fixed organic carbon in plant through net photosynthesis was 320,000 won ha^-1 year^-1 and the value of ecosystem services stored in carbon in the Namsan forest ecosystem was about 26.1 million won ha^-1 for 3 years. Conclusions: The results of this study suggest that the pine forests of Namsan rapidly decompose leaves due to the high atmospheric temperature and accumulate a large amount of organic carbon in the soil to provide climate control regulatory service function.

생쥐 중이와 상기도 점막의 섬모세포운동

정하원,오승하,유원석,이강수,모지훈,전상준,김인상,김종선 대한이비인후과학회 1999 대한이비인후과학회지 두경부외과학 Vol.42 No.9

부비동 내시경 재수술 환자에서의 전산화 단층촬영 소견

정승규,하병석,동헌종 대한이비인후과학회 2000 대한이비인후과학회지 두경부외과학 Vol.43 No.10

강선 이음형 PC 보-기둥 내부 접합부의 구조적 거동에 관한 실험적 연구

하상수,김승훈,문정호,이리형,임주혁 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

In this study, new moment-resisting precast concrete beam-column joint is proposed for moderate seismic regions. it is attempt to devise connection detail which makes workability improve and confirm effective stress transfer in the region of connection. It has the connection details which help working process simplified and construction cost reduced. as replace 9.3㎜, 7strand for reinforcement. Fore specimens for partial tension test and three specimens for beam-column interior joint test were producted. An experimental study was carried out to investigate the joint behavior subjected to reverse cyclic loading and constant axial compressive load. The test variables was transverse reinforcement in joint. Structural performance of joint is evaluated on the basis of connection strength, stiffness, energy dissipation, and drift capacity. Based on the test results, the precast connection is capable of matching or exceeding the performance of the monolithic connection and thereby provides the sufficient moment-resisting behavior to be applicable for moderate seismic regions.

자화-생물처리에 의한 염색폐수의 처리

이선하,차승훈,김재현 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(A)

The purpose of this study is to investigate treatment efficiency in dyeing wastewater treatment by the high rate aeration system(HRA) and a combination of the HRA with manetized wastewater treatment system(MWS). At the hydraulic retention time of 16hr, 24hr, 30hr, BOD removal efficiencies of HRA system were 93%, 96% and 98%, combination of the HRA with MWS system were 94%, 96.8% and 98.2%, resoectively. In case of COD, at the hydraulic retention time of 16hr, 24hr, 30hr, COD removal efficiencies of HRA system were 66%, 77.1% and 83.1%, combination of the HRA with MWS system were 70.2%, 80.1% and 86.6%, resoectively. The comparison of the HRA and combination of the HRA with MWS, effluent BOD of the former was 22.7㎎/ℓ and the latter was 19.4㎎/ℓ, therefore biological treatment efficiency identified to increase by the MWS

위선암에서 E-cadherin, a-catenin 및 p53의 표출

신영훈,양승하 순천향대학교 교수학습개발센터 2004 Journal of Soonchunhyang Medical Science Vol.10 No.3

Gastric adenocarcinoma is the most common malignant tumor in Korea. There is many reports many oncogens related to progression and metastasis of tumor. Among these oncogene, E-cadhering and a-catenin are important to maintain normal structure by cellular adhesion, The changed expression of of these genes affect to invasion and metastasis of the tumor and relate to prognosis of patients. p53 regulate cellular porliferation and over expression of p53 relates to malignant trasformation and poor prognosis of patients. To evaluate The expressing of E-cadherin, a-catenin, and p53 according to histopathologic features and the relation between these antigens and prognosis in gastric adenocarcinoma, we have performed immune staining for 91 cases. The results were as follows; 1) E-cadherin and a-catenin showed loss or reduction of expression in 50.5% and 87.9% of gastric adenocarcinoma, respectively, and the expression rates of p53 was 49.5%. 2) The frequency of the loss or reduction of E-cadherin expression in diffuse type of gastric adenocarcinoma was more high than intestinal type. 3) The frequency of the loss or reduction of a-catenin expression in cases invaded to serosa and sourrounding tissue in gastric adenocarcinoma was more high than cases to muscle layer. 4) The frequency of the loss or reduction of both E-cadherin and a-catenin was more high in diffuse type than intestinal type of gastric adenocarcinoma, and in cases invaded to serosa and surrounding tissue and in cases showing metastasis to lymph node than suscle layer and non-metastasis in advaced carcinoma 5) The expression of p53 in advanced carcinoma was more high in cases invaded to serosa and surrounding tissue and in cases showing metastasis to lymph node than muscle layer and non-metastasis. 6) The loss or reduction of both E-cadherin and a-catenin in cases showing p53 expression showed more high frequency than in p53 non expression. Abov results indicated that the loss or reduction of E-cadherin expression in gastric adenocarcinoma may be related to diffuse type, and a-catenin in advanced carcinoma to invasion depth. The expression of p53 may be related to metastatic cancer to lymph nodes and depth of depth in advanced carcinoma.

인버터 구동용 유도전동기 고정자 권선의 절연특성 연구

황돈하,김동희,이광식,정원영,김영훈,오승훈 영남대학교 공업기술연구소 1999 工業技術硏究所論文集 Vol.27 No.2

Inverters with high speed switching and advanced PWM techniques are widely used for variable speed applications. But some adverse effects on the stator winding insulation are reported due to excessive voltage stress, which results in the premature insulation breakdown. This is aggravated by the high switching speed of modem switching devices such as IGBT (Insulated Gate Bi-polar Transistor) with which the rate of rise in voltage (dv/dt) increases considerably. In this paper, the test results for evaluation on the stator winding insulation of 310V induction motors are presented. Also, the insulation characteristics are presented in order to analyze the insulation strength under high voltage due to high switching speed of IGBT PWM inverter. 26 induction motors of 6 types with different wires and insulation techniques are built and thoroughly tested. The maximum partial discharge (PD) magnitude (Qm) and the discharge inception voltage (DIV) are obtained by PD test. Under AC current test, the rate of change in AC current (ΔI) and the change in dissipation factor (Δtanδ) are measured. From the above test data, the effects due to different wires and insulation techniques on the insulation characteristics of low-voltage induction motors are compared and analyzed. The insulation technique to enhance the insulation strength is suggested from the test results.

성견에서 표면처리된 교정용 마이크로임플랜트의 골 접촉률 및 동요도

박승현,김성훈,류준하,강윤구,정규림,국윤아 대한치과교정학회 2008 대한치과교정학회지 Vol.38 No.6

The purpose of this study was to evaluate the mobility and ratio of the bone-implant contact (BIC) of a sandblasted, large grit and acid-etched (SLA) orthodontic micro-implant. Methods: Ninety-six micro-implants (48 SLA and 48 machined) were implanted in the upper and lower buccal alveolar bone, and palatal bone of four beagle dogs. Two weeks after surgery, orthodontic force (150 - 200 g) was applied. Two beagles were sacrificed at 4-weeks and the other two at 12-weeks. Histomorphometric comparisons were made between the SLA experimental group and the machined micro-implant as a control group to determine the ratio of contact between the bone and implant. Micro-implant mobility was also evaluated using Periotest. Results: Periotest values showed no statistically significant difference in the upper alveolar and palatal bone between groups except for the lower buccal area. BIC in the upper buccal area showed no significant difference between groups both at 4-weeks and 12-weeks. However, both the groups showed a significant difference in BIC ratio in the rest of the experimental areas between 4 weeks and 12 weeks. The experimental group showed active bone remodeling around the bone-implant interface compared to the control group. Conclusions: There were significant differences in the BIC and the Periotest values between the surface-treated and machined micro-implants according to bone quality in the early stage. 본 연구는 비글견에 식립된 sandblasted, large grit and acid-etched (SLA) 표면처리된 교정용 마이크로임플랜트와 평활면 마이크로임플랜트에 교정력을 가한 후 시간 경과에 따른 동요도와 골접촉률의 차이를 규명하기 위해 시행되었다. 비글 성견 네 마리를 이용하여 상, 하악 협측과 구개측 골에 대해 SLA 표면처리된 표면처리군 48개, 평활면의 비처리군 48개의 마이크로임플랜트 96개를 식립하고 2주의 치유기간 후 교정력(150 - 200 g)을 지속적으로 가했으며 식립 4주 후에 두 마리를 희생시키고, 12주 후에 나머지 2마리를 희생시켰다. 표면처리군과 비처리군 간의 마이크로 임플랜트의 동요도와 골과 임플랜트 간 접촉률을 조직학적인 측면에서 측정 비교하여 다음과 같은 결과를 얻었다. 상악 협측과 구개측에서는 표면처리군과 비처리군의 동요도에서 유의성 있는 차이가 없었으나 하악협측에서는 표면처리군이 유의하게 안정적인 동요도를 보였다. 마이크로임플랜트와 인접골 간 접촉률은 상악 협측에서는 4주와 12주 모두 표면처리군과 비처리군 간에 유의한 차이가 없었으나 하악 협측과 구개측의 경우 4주와 12주 모두 표면처리군이 비처리군에 비해 유의하게 높은 접촉률을 보였다. 표면처리군은 비처리군에 비해 임플랜트 주변에서 활발한 골개조가 관찰되었으며 모든 군에서 이물반응은 관찰되지 않았다. 본 연구를 통해 SLA 표면처리된 마이크로임플랜트는 평활면 마이크로임플랜트에 비하여 식립 초기에는 식립 부위에 따라 유의하게 높은 인접골 간 접촉률과 동요도의 안정성을 보임으로써 다양한 크기와 방향의 교정력의 적용이 가능할 것이라 생각한다.

진피내 모반, 경계 모반 및 악성 흑생종에서 p53과 Ki-67의 발현 양상

이정훈,양승하,오미혜,김의한 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.1

The authors analyzed immunohistochemical expression of mutant p53 and Ki-67 in eleven cases of intradermal nevus, 7 cases of junctional nevus and 6 cases of malignant melanoma, so following results were obtained. Results: 1. The positive reaction of p53 protein was 0%(0/11) in intradermal nevus, 43%(3/7) in junctional nevus and 83%(5/6) in malignant melanoma. 2. The positive reaction of Ki-67 was 9%(1/11) in intradermal nevus and 14%(1/7) in junctiona nevus, but the labelling index were below 10% in both nevi. In malignant melanoma, the positive reaction of Ki-67 was appeared in 50% (3/6). but the labelling index were below 20% in all positive cases Above results suggested that the p53 expression was stronger in poor differentiated tumors, so the p53 protein expression appeared to be related to the histological differentiation degree. But the Ki-67 expression appeared to be more related to the prognosis according to tumor growth rate than histological differentiation degree Because the Ki-67 labelling index was low in malignant melanoma as expected, it was difficult to justify the idea that the growth and prognosis of malignant melanoma were justified only by the Ki-67 positive reaction and labelling index. But the Ki-67 positive cells were not almostly observed in intradermal nevus and junctional nevus, So the differnetial diagnosis between benign and malignant melanocytic tumors were appeared to be possible by Ki-67 positive reaction and labelling index.

수소화된 비정질 규소에서 바이어스에 의한 실리사이드 형성

梁承勳,金鐵河,李原鎭 慶北大學校 1990 論文集 Vol.49 No.-

We show that biased annealing of a-Si:H contacted with metal gives rise to silicide growth and the creation of metastable states that can be to some extent removed by unbiased annealing. This paper gives the first report of a direct correlation of Ⅰ-Ⅴ characteristics to silicide growth in a-Si: H. Variations of Ⅰ-Ⅴ characteristics with annealing biases are analysed by the two series-connected diodes model.