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토공수로(土工水路)의 도수손실(導水損失) 및 통수능(通水能)에 관한 조사분석(調査分析)
주석훈 ( Joo Seok Hun ),고재군 ( Koh Chae Kun ),박승우 ( Park Seung Woo ) 한국농공학회 1987 韓國農工學會誌 : 전원과 자원 Vol.29 No.1
The objectives of this study were to determine the water delivery losses from earth canal irrigation systems and to evaluate the conveyances. Five irrigation districts near Ansung, Kyungki-do were chosen to be the study areas. They are Yidong, Madum, Yongdam, Gosam, and Keumkwang. For those districts, field measurement for discharge, infiltration rates, canal geometry, and watergrass density were made during irrigation periods in 1983 and 1984. The results from field data can be summarized as follows: 1. Infiltration losses per unit area of wetted perimeter at the mains and at the laterals in Keumkwang district were 3.333×10<sup>-7</sup> and 9.956×10<sup>-6</sup>㎥/s/㎡, respectively. In Gosam district they varied from 1.114×10<sup>-6</sup>㎥/s/㎡ to 5.833×10<sup>-6</sup>㎥/s/㎡ respectively. Infiltration losses per unit length of canal at laterals were generally more than those at the mains in those districts. 2. Infiltration losses increased with soil permeability at the measured points. The results suggested that the infiltration losses of a canal depend much upon the soil property. 3. The average water delivery losses per unit area of wetted perimeter from Songduk, Mogok, Yongdam, Antak, and Keumkwang canals were 7.200×10<sup>-5</sup>㎥/s/㎡ at the mains, and 9.496×10<sup>-5</sup>㎥/s/㎡ at the laterals. And the average water delivery losses per unit length of canal at the mains, laterals, and ditches were 2.414×10<sup>-4</sup>, 1.649×10<sup>-4</sup>, and 4.170×10<sup>-6</sup>㎥/s/m respectively. 4. The average rates of water losses from Songduk, Mogok, Yongdam, Antak, and Keumkwang canals were 21.25% at the mains, 31.15% at the laterals, and 6.97% at the ditches. 5. Operational losses per unit length of canal were 4.282×10<sup>-4</sup>㎥/s/m in the Keumkwang district, and 2.515×10<sup>-4</sup>㎥/s/m in the Gosam district. 6. Operational losses amounted to about 31 times as much as infiltration losses in the Keumkwang district, and about 5times in the Gosam district. 7. Watergrass densities and Manning’s roughness coefficients of Keumkwang and Gosam districts showed a close relationship between them.
정재운,윤광식,주석훈,최우영,이용운,류덕희,이수웅,장남익,Jung, Jae-Woon,Yoon, Kwang-Sik,Joo, Seuk-Hun,Choi, Woo-Young,Lee, Yong-Woon,Rhew, Doug-Hee,Lee, Su-Woong,Chang, Nam-Ik 한국농공학회 2009 한국농공학회논문집 Vol.51 No.6
In this study, pollutant loads delivery ratio by flow duration in Hwangryoung A watershed was estimated. The delivery ratio was estimated with measured data by Ministry of Environment(MOE) and the regression equation based on geomorphic parameters. Eight day interval flow data measured by the MOE were converted to daily flow to calculate daily load and flow duration curve by correlating data of neighboring station which has daily flow data. Regression equation developed by previous study was tested to study watershed and found to be satisfactory. The delivery ratios estimated by two methods were compared. For the case of Biochemical oxygen demand(BOD), the delivery ratios of low flow condition were 7.6 and 15.5% by measured and regression equation, respectively. Also, the delivery ratios of Total phosphorus(T-P) for normal flow condition were 13.3 and 6.3% by measured and regression equation, respectively.
건강보험통계를 활용한 간편고지 상품의 담보별 최적 언더라이팅 기준 산출
황지연,이상엽,주석훈 한국보험학회 2020 保險學會誌 Vol.124 No.-
In this paper, we calculate the optimal underwriting criteria by coverage of simplified issue product by using National Health Insurance Service Sample Cohort 2.0 dataset. This dataset enable us to trace comprehensive prehistory of each pateints in the long term period. This can make more detailed anaysis than existing silmplified risk rate with experience data. For analysis, we generate around 92 thousand vitural underwriting questionnaires and underwrite virtually 1 mil candidates. By using this result, we optimized underwriting questionnaires to minimize the cost function signifying trade-off between market size and risk rate. The analysis proves that the optimal questionnaires consis of major disease prehistory in 5 years not treament records in 5 years. Especially cancer question can enhance efficiency of questionnaire of products covering stroke and acute myocardial infarction. For comprehensive health product, major disease prehistory is the effective questions. On contrast, simplifed issue products in non-life insurers only questioning treatment history within 1 and 2 year shows higher risk than expected market growth. 이 연구는 국민건강보험 표본코호트 2.0 데이터를 사용하여, 간편고지 상품의 담보별 최적 언더라이팅 기준을 산출하였다. 표본코호트 2.0 데이터는 개별 대상자에 대한 장기간의 통합적 병력을 관찰할 수 있어, 기존 경험통계를 기준으로 산출되던 간편고지 위험률의 한계점을 보완해줄 수 있다. 분석을 위해, 9만2천여건의 가상의 청약서를 조합하였고 만들어진 청약서를 기준으로 통계 대상자 100만명에 대한 언더라이팅을 진행하였다. 이후 가입자수와 위험률 사이의 관계를 반영한 목적함수를 설정하고 가입자수는 늘리면서 위험률은 낮추는 최적화 조건을 반영한 언더라이팅 기준을 담보별로 산출하여, 담보별 최적 질문지를 도출하였다. 분석결과 암과 뇌출혈, 급성심근경색 등의 중대질환의 진단을 보장하는 상품의 경우 입원·수술 등 치료 이력이 아닌 5년 내의 해당 질병 이력을 묻는 질문지가 최적인 것으로 판단되었다. 특히, 뇌졸중과 급성심근경색을 보장하는 2대 진단 중심의 상품의 경우, 뇌혈관 심혈관 계통의 질병 병력만 충분히 체크한다면 표준청약서와 상대위험도가 통계적으로 차이가 없도록 청약서를 줄일 수 있었다. 개별 담보 단위가 아닌 종합적인 건강보험 상품을 기준으로 보더라도, 5년 내의 치료이력을 위주로 최적 질문지가 구성되었다. 반면 현재 손해보험사를 중심으로 판매되고 있는 31, 32 등 치료 이력만으로 위험을 제어하는 변형 간편고지 상품의 경우 고객확장에 비해 위험도가 현저하게 높아 효율성이 낮은 것으로 보인다. 따라서 해당 상품은 손익측면에서 판매에 각별한 유의가 필요한 것으로 보인다.
정재운,윤광식,최우정,최우영,이수형,장남익,홍순강,주석훈 한국습지학회 2008 한국습지학회지 Vol.10 No.3
본 연구에서는 논에서의 영양물질 제거능력에 대하여 평가하였다. 논을 인공습지라는 관점으로 보고 전라남도 함평군 엄다면 화양리의 논 지구(이하 학야지구)를 시험지구로 선정하여 2004년 5월부터 9월까지 영농기 기간동안 조사하였다. 학야지구를 대상으로 물수지 및 물질수지를 조사하여 논에서의 T-N, T-P의 제거능력을 조사한 결과 지표유출 부하로 T-N, T-P가 각각 20.82 kg/ha, 1.55 kg/ha로 나타났으며, 이는 연구대상 논에 총 투입된 T-N, T-P의 13.2%와 6.4%에 해당되는 양이다. 연구 결과는 투입된 대부분의 영양물질이 논에서 처리됨을 보여주었다. In this study, the nutrient removal capacity of paddy field was investigated. Paddy field was considered as a constructed wetland. The present study was conducted during a cropping period in a rice cultivation area located in Hampyung-gun, Jeollanamdo, Korea. Water balance and mass balance of nutrients were estimated after intensive field monitoring. The surface runoff losses of T-N and T-P were 20.82 kg/ha and 1.55 kg/ha, respectively. The losses were 13.2% and 6.4% of T-N and T-P input into paddy fields, respectively. The results showed that the paddy fields have nutrient removal function.