• 한국농공학회논문집
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• 제66권1호
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• pp.49-66
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• 2024

Extreme rainfall will become intense due to climate change, increasing inundation risk to agricultural land. Hydrological and hydraulic simulations for the entire watershed were conducted to analyze the impact of climate change. Rainfall data was collected based on past weather observation and SSP (Shared Socio-economic Pathway)5-8.5 climate change scenarios. Simulation for flood volume, reservoir operation, river level, and inundation of agricultural land was conducted through K-HAS (KRC Hydraulics & Hydrology Analysis System) and HEC-RAS (Hydrologic Engineering Center - River Analysis System). Various scenarios were selected, encompassing different periods of rainfall data, including the observed period (1973-2022), near-term future (2021-2050), mid-term future (2051-2080), and long-term future (2081-2100), in addition to probabilistic precipitation events with return periods of 20 years and 100 years. The inundation area of the Aho-Buin district was visualized through GIS (Geographic Information System) based on the results of the flooding analysis. The probabilistic precipitation of climate change scenarios was calculated higher than that of past observations, which affected the increase in reservoir inflow, river level, inundation time, and inundation area. The inundation area and inundation time were higher in the 100-year frequency. Inundation risk was high in the order of long-term future, near-term future, mid-term future, and observed period. It was also shown that the Aho and Buin districts were vulnerable to inundation. These results are expected to be used as fundamental data for assessing the risk of flooding for agricultural land and downstream watersheds under climate change, guiding drainage improvement projects, and making flood risk maps.

• 로봇학회논문지
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• 제5권3호
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• pp.262-269
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• 2010

This paper presents a probabilistic head tracking method, mainly applicable to face recognition and human robot interaction, which can robustly track human head against various variations such as pose/scale change, illumination change, and background clutters. Compared to conventional particle filter based approaches, the proposed method can effectively track a human head by regularizing the sample space and sequentially weighting multiple visual cues, in the prediction and observation stages, respectively. Experimental results show the robustness of the proposed method, and it is worthy to be mentioned that some proposed probabilistic framework could be easily applied to other object tracking problems.

• 한국기후변화학회지
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• 제2권4호
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• pp.221-235
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• 2011

이 논문에서는 우리나라의 기후변화를 연구한 기존 논문 결과를 정리했다. 필요한 경우, 주변 국가 및 전지구 기후변화를 연구한 논문도 참고했다. 현재까지 축적된 우리나라 기상관측 자료를 분석한 연구를 종합해 보면, 지난 100년간 한반도에 나타난 기온상승은 자연적 변화 범위를 넘어선 것으로 판단된다. 특히, 전구 평균 해수면 온도상승보다 큰 한반도 주변 해역의 온도상승과 연관되어 우리나라 강수량이 많아졌고, 접근하는 태풍 활동도 강해졌다. 이들 기상 요소뿐 아니라 대규모 대기순환장의 변화가 한반도와 주변지역의 기후에 영향을 끼쳐서 여름 몬순인 장마와 겨울 몬순인 한파의 시공간적 특성에 변화를 가져왔다. 이 연구에서는 짧은 준비기간과 지면의 한계, 그리고 저자들의 한정된 지식으로 인하여 관련된 모든 연구를 정리하지 못했지만, 향후 연구자들이 우리나라와 주변지역 기후변화 연구를 하는 데 있어서 도움을 줄 것으로 기대한다.

• 대한금속재료학회지
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• 제46권12호
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• pp.800-808
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• 2008

Heat treatment is an important step for tool manufacture, but unavoidably generates dimensional distortion. This study investigated the continuous dimensional change and the anisotropic behavior of STD11 tool steel during austenitizing and tempering heat treatment especially using quenching dilatometer. Dilatometric results represented that the dimensional change along longitudinal direction was larger than that along transverse direction. Anisotropic phase transformation strain was produced in forged STD11 tool steel during heat treatment. Anisotropic dimensional change increased with increasing austenitizing temperature. After tempering, anisotropic distortion was partially reduced. FactSage thermodynamic equilibrium phase simulation and microstructural observation (FE-SEM, TEM) showed that large ($7{\sim}80{\mu}m$) elongated $M_7C_3$ carbides could be formed along rolling direction. The resolution of elongated carbides during austenitizing was found to be related with the change of martensite transformation temperature after heat treatment. Anisotropic size change of STD11 tool steel was mainly attributed to large elongated carbides produced during rolling process. Using dilatometric and metallographic examination, the possible mechanism of the anisotropic size change was also discussed.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2005년도 춘계학술대회
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• pp.516-519
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• 2005

The pilot tidal current power plant is to be constructed at the Uldolmok between Chindo and Haenam, during next year. and extensive coastal engineering research works have been carried out. In this paper we describes some observation results of the tide and tidal current. as well as modeling work in order to investigate the tide and tidal current regime change in relation to the tidal current power plant (TCPP) construction. The special modeling skill in order to consider the turbine operation in the TCPP is developed and applied to the estimation for the flow regime change by the simple layout of the tidal current power plant.

• 신재생에너지
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• 제1권2호
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• pp.73-78
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• 2005

The pilot tidal current power plant is to be constructed at the Uldolmok between Chindo and Haenam, during next year, and extensive coastal engineering research works have been carried out. In this paper we describes some observation results of the tide and tidal current, as well as modeling work in order to investigate the tide and tidal current regime change In relation to the tidal current power plant [TCPP] construction. The special modeling skill in order to consider the turbine operation in the TCPP is developed and applied to the estimation for the flow regime change by the simple layout of the tidal current power plant.

• 대한한의학원전학회지
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• 제33권3호
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• pp.21-36
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• 2020

Objectives : This paper aims to understand the meaning of '少陰人 心之範圍' and to determine its clinical implication. Methods : First, the meaning of the verb '範圍' was examined in 『IChing·XiCi(周易·繫辭傳)』 from where it originated. Based on the findings, the meaning of '心之範圍' in the context of the nature and emotion[性情] of So-eumin as explained in the 『DongUisusebowon(東醫壽世保元)』 was further investigated. Moreover, the clinical significance of the observation of '心之範圍' in relation to determining prognosis was discussed in regards to 'visceral syncope[藏厥]' and 'exuberating yin separating yang[陰盛隔陽]' which come under the severe symptoms[危證] category in the disease pattern of So-eumin. Results : '範圍' as mentioned in 『IChing·XiCi(周易·繫辭傳)』 refers to the process of creating a framework that takes after the tendencies of the patterns of change of the external world that influences mankind. The objective of this process is to prepare for the excessiveness and insufficiency of the change that happens in the external world so as to ultimately protect all existences. The workings of '範圍' could be assumed on a personal level as well. As the nature and emotion of So-eumin is closely related to the purpose and object of '範圍', Yi Jema suggested that through observing whether the So-eumin exhibits '心之範圍' or not, that it could be determined whether his/her innate nature is being properly exercised or not. Conclusions : Whether one's agitation calms down or not even for a moment is the criteria for determining prognosis of the entire disease, while its calming-down relies on proper functioning of '心之範圍'. The way to determine this is through observation of the manifest attitude of the So-eumin. If the So-eumin displays a poised and autonomous[綽綽卓卓] attitude even for a moment, it could be understood as the '心之範圍' process being properly functioning, indicating the overall direction to be heading towards relief of the sense of instability, allowing for a positive outlook on treatment.

• 한국정밀공학회지
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• 제17권10호
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• pp.186-191
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• 2000

We use so many plastic products in everyday. Because polymer materials have a lot of merits including low cost and easiness of forming, they are widely using at many manufacturing industries. Microcellular foaming process appeared at MIT in 1980's to save a quantity of material and increase mechanical properties. The information about the thickness of cavity plays an important role in appling microcellular foaming process to the conventional injection molding process. It is essential to make an effective foam. The goal of this research is to measure the relation between the change of cavity's thickness and foaming magnitude made after inserting a gas. R/t is a conception that indicate proportion between radius and thickness of cavity in mold system. By means of SEM observation of side surface of cavity sample, foaming magnitude of cavity is mold system. By means of SEM observation of side surface of cavity sample, foaming magnitude of polymer in microcellular foaming process is decreasing gradually as the value of R/t is increasing. The proposed foaming magnitude changes data of polymer in relation to mold system can be applied in more extensive injection molding process, such as optimum design of mold for microcellular foaming process.

• 생약학회지
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• 제23권2호
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• pp.96-105
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• 1992

The studies were attempted to evaluated the therapeutic effects of various fractions(ether, methanol, butanol) of Caragana chamlagu roots on the hyperlipemia induced by feeding the diet containing 1%, cholesterol and 0.5%, cholic acid in rats, and on the hyperglycemia induced by streptozotocin in rats. Also the preventive effects of these fractions were studies on the liver damage in $CCl_4-intoxicated$ rats. The followings were obtained as the results: 1.The butanol fraction was significantly shown to down the serum lipid level in 1%, cholesterol and 0.5%, cholic acid diet-feeding rats and streptozotocin-induced hyperglycemic rats. Cholesterol level in $CCl_4-intoxicated$ rats was reduced in the case of all pre-treated groups. 2.The serum glucose level of streptozotocin-induced hyperglycemic rats was significantly decreased by the administration of various fractions of C. chamlagu roots, and the lipid-peroxidation of pancreas was significantly decreased in the case of administration of these fractions. 3.The activates of s-GOT and s-GPT were decreased by the administration of various fractions, especially in butanol fraction, of C. chamlagu roots in the $CCl_4-intoxicated$ rats. The liver lipid-peroxidation was decreased by administration of 200mg/kg of these fractions in the $CCl_4-intoxicated$ rats. In histological observation, hepatic cellular necrosis and fatty acid deposit were increased remarkably by $CCl_4-intoxication$, but the pretreatment of various fractions of C. chamlagu roots improved the pathological change of parenchymatous cell necrosis and fatty change around centrilobular area of the control.

• Advances in pediatric surgery
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• 제14권2호
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• pp.134-143
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• 2008

Infantile hepatic hemangioendothelioma (IHHE) is the most common benign vascular hepatic tumor in children. We analyzed the 17-year experience of IHHE. The medical records of 16 patients (M:F=8:8) treated at the Department of Pediatric Surgery and the Department of Pediatrics Seoul National University Children's Hospital between January 1991 and January 2008 were reviewed retrospectively. Mean age at presentation was 87 days (1 day - 551 days). Seventy five percent of patients were diagnosed with imaging study and 25 % with biopsy. Major symptoms were hepatomegaly (N=5), palpable abdominal mass (N=4) and congestive heart failure (N=3). Six patients had no symptoms. Kasabach-Merritt syndrome was combined in one patient. Nine patients (56.3 %) underwent operation and 2 patients (12.5 %) underwent only medical treatment. Clinical observation was tried on 5 patients (31.3 %) without any treatment. Operation was performed on the patient with clinical symptoms or on patients where the differentiation between begin and malignant could not be determined. Patients who had clinical symptoms but tumor was unreresectabile were treated medically. Among the 5 patients who had been observed for their clinical course, 2 patients showed complete regression and the tumors of the remaining 3 patients were regressing. Clinical symptoms, the age at presentation, the size of tumor and ${\alpha}$-FP, all had no significant statistical relationship with the time required for complete tumor regression. There was no relationship between the size change of the tumor and the change of ${\alpha}$-FP level. Only the size of tumor was related with clinical symptoms. One patient died of post-operatvie bleeding. Treatment plan was determined by the extent of the tumor and the presence of clinical symptoms. Observation was enough for the patients without clinical symptoms and complete resection was curative for patients with clinical symptoms. Medical treatment is an alternative for the patient whose tumor is unresectable.