온톨로지 기반 최적 리모델링 대안선정 방법

지현서,조규만,김태훈 한국건설관리학회 2023 한국건설관리학회 논문집 Vol.24 No.1

Due to economic or environmental reasons, green remodeling projects for old buildings are being actively carried out. Meanwhile, in the process of performing the green remodeling, the plan of green remodeling including passive and active elements has been decided based on the subjective experience and knowledge of engineers currently. Therefore, in this study, an ontology-based green remodeling decision-making support model, which can analyze the properties of old buildings and suggest appropriate remodeling plans, was established. In the developed model, once the basic properties of a building are entered, an appropriate remodeling plan composed of passive and active elements can be provided. By utilizing the results developed through the research, it is expected that it will be possible to support decision-making on more objective and appropriate remodeling alternatives development through web-based meta data search in accordance with the accumulation in remodeling cases.

사과농가의 위험태도 분석

지현서(Hyun-Seo Ji),김태균(Tae-Kyun Kim) 한국농업경제학회 2010 農業經濟硏究 Vol.51 No.2

This paper analyzes two major approaches to measuring risk attitude focused on apple farmers in Korea . In the literature, two major measurement approaches can be identified: those from the expected utility framework, and those constructed using psychometrics. The results show that the mean of Arrow-Pratt coefficients of absolute risk aversion is 0.3529×10-5. The results also indicate that the statements with the highest level of agreement addressed the following risk management tools: familiarity with neighborhood, management of damages by harmful insects, adequate period of farming operation, maintaining a low debt-to-asset ratio, and making necessary preparations for a flood. The test with actual market behavior shows that more risk-averse farmers are more likely to buy crop insurance. The results show that greater risk aversion is significantly related to buying crop insurance. In contrast, the psychometric scale is less significantly related to buying crop insurance. The findings of this study could be an important information to manage agricultural risk.

강우유출수 관리시설의 설계를 위한 강우사상 특성 분석

김학관,지현서,장선숙,Kim, Hak Kwan,Ji, Hyun Seo,Jang, Sun Sook 한국농공학회 2017 한국농공학회논문집 Vol.59 No.6

The objective of this study is to investigate whether the daily rainfall depth derived from daily data represents the event rainfall depth derived from hourly data. For analysis, the 85th, 90th, and 95th percentile daily rainfall depths were first computed using daily rainfall data (1986~2015) collected at 63 weather stations. In addition, the storm event was separated by the interevent time definition (IETD) of 6, 12, 18, and 24 hr using hourly rainfall data. Based on the separated storm events, the 85th, 90th, and 95th percentile event rainfall depths were calculated and compared with the using hourly rainfall data with the 85th, 90th, and 95th percentile daily rainfall depths. The event rainfall depths computed using the IETD were greater than the daily rainfall depths. The difference between the event rainfall depth and the daily rainfall depth affects the design and size of the facility for controlling the stormwater. Therefore, the designer and policy decision-maker in designing the stormwater best management practices need to take into account the difference generated by the difference of the used rainfall data and the selected IETD.

제23장 과채 수급 동향과 전망

김수림,지현서,김종규,정호근 한국농촌경제연구원 2011 한국농촌경제연구원 기타연구보고서 Vol.- No.-

제22장 과채 수급 동향과 전망

김수림,지현서,이형용,유정애,정호근 한국농촌경제연구원 2012 한국농촌경제연구원 기타연구보고서 Vol.- No.-

제26장 과채 수급 동향과 전망

정은미,김수림,지현서,김종규 한국농촌경제연구원 2010 한국농촌경제연구원 기타연구보고서 Vol.- No.-

추적자 실험 및 3차원 수치모의를 이용한 저수지 수처리 장치의 영향반경 평가

박형석,이은주,지현서,최선화,정세웅 한국수처리학회 2018 한국수처리학회지 Vol.26 No.6

The objective of this study was to evaluate the radius of influence of effluent of water treatment system developed for the purpose of improvement of reservoir water quality using fluorescent dye (Rhodamine-WT) tracer experiment and 3-D numerical model. The tracer experiment was carried out in a medium-sized agricultural reservoir with a storage capacity of 227,000 m3 and an average depth of 1.6 m. A guideline with a total length of 160 m was installed at intervals of 10 m in the horizontal direction from the discharge part, and a Rhodamine measurement sensor (YSI 6130, measurement range 0-200 μg/L) was used to measure concentration changes in time, distance, and depth. Experimental design was established in advance through Jet theory and the diffusion process was simulated using ELCOM, a three dimensional hydraulic dynamics model. As a result of the study, the direct effect radius of the jet emitted from the applied water treatment system was about 50-70 m, and the radius of physical effect by the advection diffusion was judged to be 100-120 m. The numerical simulations of effluent advection-diffusion of the water treatment system using ELCOM showed very similar results to those of the impact radius analysis using the tracer experiment and jet flow empirical equations. The results provide valuable information on the spatial extent of the water quality improvement devices installed in the reservoir and the facility layout design.

부하지속곡선을 이용한 비점오염원 우선관리 지역 선정 및 관리목표 설정 연구

장선숙 ( Jang Sun Sook ),지현서 ( Ji Hyun Seo ),김학관 ( Kim Hak Kwan ) 한국농공학회 2018 한국농공학회논문집 Vol.60 No.5

The objective of this study is to identify the priority area where the nonpoint source pollution (NPS) management is required and to set up the load reduction goals for the identified priority area. In this study, the load duration curve (LDC) was first developed using the flow and water quality data observed at 286 monitoring stations. Based on the developed LDC, the priority area for the NPS pollution management was determined using a three-step method. The 24 watersheds were finally identified as the priority areas for the NPS pollution management. The water quality parameters of concern in the priority areas were the total phosphorus or chemical oxygen demand. The load reduction goals, which were calculated as the percent reduction from current loading levels needed to meet target water quality, ranged from 67.9% to 97.2% during high flows and from 40.3% to 69.5% during moist conditions, respectively. The results from this study will help to identify critical watersheds for NPS program planning purposes. In addition, the process used in this study can be effectively applied to identify the pollutant of concern as well as the load reduction target.

수심이 얕은 저수지에서 용존산소 동적 모니터링을 통한 인 내부부하 평가

박형석,최선화,정세웅,지현서,오정국,전항배 한국환경영향평가학회 2017 환경영향평가 Vol.26 No.6

In these days, agricultural reservoirs are considered as a useful resource for recreational purposes, tour and cultural amenity for vicinity communities as well as irrigation water supply. However, many of the agricultural reservoirs are showing a eutrophic or hyper-eutrophic state and high level of organic contamination. In particular, about 44.7% of the aged agricultural reservoirs that constructed before 1945 exceed the water quality criteria for irrigational water use. In addition to external loading, internal nutrient loading from bottom sediment may play an important role in the nutrient budget of the aged reservoirs. The objectives of this study were to characterize variations of thermal structure of a shallow M reservoir (mean depth 1.7 m) and examine the potential of internal nutrient loading by continuous monitoring of vertical water temperature and dissolved oxygen (DO) concentration profiles in 2015 and 2016. The effect of internal loading on the total loading of the reservoir was evaluated by mass balance analysis. Results showed that a weak thermal stratification and a strong DO stratification were developed in the shallow M Reservoir. And, dynamic temporal variation in DO was observed at the bottom of the reservoir. Persistent hypoxic conditions (DO concentrations less than 2 mg/L) were established for 87 days and 98 days in 2015 and 2016, respectively, during the no-rainy summer periods. The DO concentrations intermittently increased during several events of atmospheric temperature drop and rainfall. According to the mass balance analysis, the amount of internal PO4-P loading from sediment to the overlying water were 37.9% and 39.7% of total loading during no-rainy season in 2015 and 2016, respectively on August when algae growth is enhanced with increasing water temperature. Consequently, supply of DO to the lower layer of the reservoir could be effective countermeasure to reduce nutrient release under the condition of persistent DO depletion in the bottom of the reservoir. 최근 농업용 저수지는 용수공급과 함께 지역의 관광, 문화, 위락시설 등으로 활용되고 있다. 그러나 많은 농업용 저수지들은 부영양호로 분류되며 높은 유기물 오염도를 보이고 있다. 특히, 1945년 이전에 준공된 노후화된 농업용 저수지의 44.7%는 농업용수 수질 환경기준을 초과하고 있다. 노후화된 저수지의 경우 외부기원 오염부하 이외에 누적된 퇴적물로부터 발생하는 내부부하는 영양염류 공급에 중요한역할을 한다. 본 연구의 목적은 수심이 얕은 M 저수지(평균 수심 약 1.7 m)를 대상으로 2015년과 2016년에 수심별 수온과 저층 용존산소(DO) 농도를 연속 측정하여 저층 수환경의 동적변화를 모니터링함으로써영양염류의 내부 부하 가능성을 조사하는데 있다. 또한, 물질수지해석을 통해 내부 인부하가 저수지 전체인부하량에 미치는 영향에 대해 평가하였다. 연구결과 수심이 얕은 M 저수지에서 약한 수온성층과 강한DO 성층 현상이 나타났다. 그리고, 저수지 저층에서 DO의 동적변화를 관찰한 결과, 여름철 무강우 기간동안 지속적인 저산소 (DO 2 mg/L 미만) 상태가 2015년과 2016년에 각각 87일과 98일간 발생하였다. DO 농도는 대기온도 강하와 강우발생 기간 동안 간헐적으로 증가하였다. 물질수지분석결과, 수온상승과함께 조류성장이 촉진되는 8월에는 PO4-P 내부 부하량이 무강우시 전체 부하량 대비 2015년과 2016년 에 각각 37.9%와 39.7%로써 큰 비중을 차지하였다. 따라서 지속적인 저층 저산소 상태가 유지되는 경우에는, 퇴적층의 영양염류 용출을 억제하기 위한 DO 공급 대책이 유효 할 것으로 판단된다.

지표유출률과 하천 수질과의 상관관계분석

장선숙 ( Sunsook Jang ),지현서 ( Hyeunseo Ji ),박준오 ( Junoh Park ),최지용 ( Jiyong Choi ),김학관 ( Hakkwan Kim ) 한국농공학회 2018 한국농공학회 학술대회초록집 Vol.2018 No.-

The purpose of study is to investigate the relationship between the surface runoff rate defined as a proportion of annual surface runoff to annual average precipitation and stream water quality. For this, the surface runoff rate was first estimated in the Han River basin located in South Korea using the calibrated and validated HSPF model, and the statistical analysis was then performed to investigate correlation between computed surface runoff rate and observed water quality. In addition, the applicability of surface runoff rate as indicators to measure the impacts of land development on stream water quality was evaluated by using the receiver operating characteristics (ROC) analysis. The results of the statistical analysis and ROC analysis indicated that there were the significant relationships between surface runoff rate and higher proportions of surface runoff could lead to higher concentrations of BOD, COD, and T-P in streams. In addition, the results from this study suggest that it is needed to manage and control the surface runoff rate within about 15% for prevent the degradation of stream water quality.