수요함수 접근법을 이용한 생활용수 공급편익 산정

여규동(Yeo Kyu Dong),이충성(Yi Choong Sung),김길호(Kim Gil Ho),이상원(Lee Sang Won) 대한토목학회 2012 대한토목학회논문집 B Vol.32 No.4B

기존에는 댐사업의 생활용수 공급편익 산정시 실무적으로 대체댐비용법을 적용하였다. 그러나 해당 댐의 대체시설로서 2순위의 댐을 적용하는 것은 논리적으로 적절하지 않다. 본 연구의 목적은 생활용수 공급사업의 효과에 대한 소비자의 효용을 지불의사액으로 측정하고, 수요함수를 도출하여 편익산정 방법을 제시하는 것이다. 이를 위해 수도권지역에서 1,000기구를 대상으로 생활용수의 사용량 변화에 대한 한계지불의사액을 측정하였다. 그리고 한계지불의사액을을 이용하여 가구별 수요함수를 추정하고, 최종적으로 용수공급 사업의 경제성분석에 적용할 수 있는 월평균 편익산정식을 도출하였다. 제시된 방법론은 적용방법 설명과 토론을 위해 예제로서 송리원댐(현 영주댐)에 적용하였다. 예제 적용 결과, 내용연수인 50년간 총 편익은 약 900억원으로 산정되었다. 본 연구에서 제시된 방법론은 향후 관련 연구 뿐 아니라, 댐 건설사업을 비롯한 생활용수 공급사업에서 경제성분석시 실무적 활용이 가능할 것으로 기대된다. In the past, the domestic water supply benefit of dam has been estimated by replacement dam cost approach. But it is logically inappropriate that we use the second priority dam as a replaced facility. Therefore, this study aims to suggest the estimation method of the domestic water supply benefit by using demand function, which is deduced from Willingness-To-Pay (WTP) of consumers. For this purpose, a survey concerning the marginal WTP is carried out according to the change of water use amount used, targeted 1,000 households in metropolitan area. And by using the marginal WPT, we estimated the demand function of a family. Finally, the monthly benefit equation is derived. The approach is demonstrated and discussed for an example, the Song-Li-Won dam project which is now renamed Young-Ju dam. From the example study, the total benefit for the durable years (50 years), was about 90 billion won. The method proposed herein is expected to be practical and useful in the economic analysis of the domestic water supply project including dam construction, as well as in further studies.

Analysis of lawsuit cases in the Department of Surgery in Korea

Ji Yun Jung,김소윤,Dong Gyu Kim,Choong Bai Kim,Kyong-Choun Chi,강원경,Won Lee 대한외과학회 2018 Annals of Surgical Treatment and Research(ASRT) Vol.94 No.3

Purpose: The aim of this study is to prepare medical staff in order to prevent medical malpractice litigation through analysis of litigation cases related to the department of surgery in Korea. Methods: A total of 94 litigation cases related to the department of surgery, where a certain amount of payment was ordered to the defendant between 2005 through 2010, were analyzed. We examined time of occurrence, amount claimed and awarded in damages, plaintiff claims, and court opinion. Results: An average of 3.2 years was spent from the date of the incident occurring to the end of the litigation procedures. The average amount awarded in judgments for damages was 59,708,983 ± 67,307,264 (range, 1,700,000–365,201,482) Korean won. Cases were found involving the following opinion of the court: violation of duty of care (49 cases), violation of informed consent (7 cases), violation of duty of care and informed consent (5 cases), and settlement, reconciliation, and others (32 cases). By analyzing defendants’ negligence in court opinions, diagnosis (30.8%) was the most common, followed by post-operation management (27.7%). Conclusion: Physicians have to conduct treatment and surgery based on exact diagnosis and be careful to observe patients’ conditions and symptoms after surgery. It is essential to identify the current status and characteristics of medical litigation for reducing further litigation and improving patient safety. In order to create a safe medical environment, national efforts should be made not only by individuals but also at the national level.

Aortic Valve Involvement in Behcet`s Disease. A Clinical Study of 9 Patients

(Choong Won Lee),(Ji Soo Lee),(Won Ki Lee),(Chan Hee Lee),(Chang Hee Suh),(Chang Ho Song),(Yong Beom Park),(Soo Kon Lee),(Yong Soon Won) 대한내과학회 2002 The Korean Journal of Internal Medicine Vol.17 No.1

N/A Objectives : To assess the clinical features, pathologic findings, postoperative results and the effects of immunosuppressive therapy in patients with Behget's disease (BD). Methods : We reviewed the postoperative course of the 9 BD patients who underwent a total of 17 aortic valve replacement procedures with prosthetic valves. Results : Histological examination of the aortic valve commonly revealed diffuse myxoid degeneration (75 percent). Of 17 valve replacement surgeries, 13 surgeries resulted in complications, such as detachment of the prosthetic valve with perivalvular leakage and dehiscence of the sternotomy wound, within an average of 5 months (range from 1 month to 14 months). The rate of prosthetic valve detachment was 76 percent (13 of 17 surgeries). Four of the 9 patients (44 percent) who underwent aortic valve replacement procedures died of heart failure or infection associated with the detachment of the prosthetic valve, and perivalvular leakage within an average of 9 months. Aortic insufficiency associated with dehiscence of the prosthetic valve developed in 11 of 12 surgical cases (92 percent) with a mechanical valve and 2 of 5 surgical cases (40 percent) with tissue valves. Thirteen of 15 surgeries (87 percent) which were not given postoperative immunosuppressive therapy developed complications, while none of 2 surgeries that used postoperative immunosuppressive therapy with prednisolone (1 mg/kg/day) and azathioprine (100 mg/day) had these complications. Conclusion : The rates of prosthetic valve detachment in BD involving aortic valve were higher than those of other diseases. Aortic valve involvement was also one of the poor prognostic factors in BD. Intensive postoperative immunosuppressive therapy and surgical methods may be important factors for postoperative results.

A Retrospective Study on the Comparison of Outbreaks of Food Poisoning for Food Hygiene in Korea and Japan

Won-Chang Lee,Choong-Il Chung 한국식품위생안전성학회 1996 한국식품위생안전성학회지 Vol.11 No.4

Retrospective study on the comparison of outbreaks of food poisoning for food hygiene in Korea and Japan. The average value of morbidity rate by year in Korea during the period of 1971 to 1992 was 2.9 per 100,000 population, and that of Japan was 29.1. The mean value of mortality rates in case of food poisoning by year in Korea was 2.33%, and that of Japan was 0.07%. When compared the rates of morbidity and mortality between Korea and Japan during the same period, the morbidity rates of Japan were much higher than those of Korea (p$lt;0.0l). However, mortality rate of patients in Korea were much higher then those of Japan (p$lt;0.01). Resulting from comparative observation of food poisoning by preparing facilities between Korea and Japan. The highest list the places where the outbreaks occurred was home-made foods accounted for 48.8% of the total cases in Korea and that of Japan was restaurants accounted for 33.0%. Causative foods in Korea, the most common incrimination vehicles were seafood, meat and animal products and grain and vegetables, including mushroom. However, in the case of the common incrimination vehicles Japan were unknown and other foods, seafood, vegetables and meat and animal products etc.. Food poisoning of pathogenic substance in Korea were 60.9% of bacterial food poisoning of the total cases showing that Vibrio species, Salmonella spp., Staphylococcus app., pathogenic E. coli, Clostridium app. and other app. were 33.3%, 26.2%, 16.3%, 5.3%, 0.4% and 18.5%, respectively. On the other hand, in Japan, major causes were Vibrio app. (45.7%), Staphylococcus app. (23.7%), Salmonella app. (16.8%), pathogenic E. coli (3.8%), Clostridium app. (0.2%) and other app. (9.6%).

Field Control of Phytophthora Blight of Pepper Plants with Antagonistic Rhizobacteria and DL-$\beta$-Amino-n-Butyric Acid

Lee, Jung-Yeop,Kim, Beom-Seok,Lim, Song-Won,Lee, Byung-Kook,Kim, Choong-Hoe,Hwang, Byung-Kook The Korean Society of Plant Pathology 1999 Plant Pathology Journal Vol.15 No.4

Treatment with antagonistic rhizobactera Burkholderia cepacia strain N9523 or an inducer of resistance DL-$\beta$-amino-n-butyric acid (BABA) effectively inhibited Phytophthora capsici infection on pepper plants in artificially infested pots. Treatment with BABA alone at $1,000\mu\textrm{g}$/ml or together with B. cepacia in combination induced a strong protection from the Phytophthora disease in the greenhouse. In artificially infested field, protection of pepper plants against the Phytophthora epidemic by BABA treatment was maintained at a considerable level. In contrast, soil drench with the antagonist B. cepacia alone, or in combination with BABA did not suppress the Phytophthora epidemic in the field. Mortality of pepper plants caused by P. capsici infection was significantly reduced by treatment with the antagonist Pseudomonas aeruginosa strain 950923-29 and BABA (12-29% plants diseased) relative to the untreated control (41-91% plants diseased) in the naturally infested field. Treatment with the antagonist Ps. aeruginosa strain 950923-29 and BABA also resulted in high levels of protection against Phytophthora blight in pepper plants. In the plastic filmhouse test, the average percentage of plants diseased was significantly low relative to the naturally infested field. Treatment with the antagonist Ps. aeruginosa strain 950923-29 and BABA in combination was most effective in suppressing the Phytophthora disease in field and plastic filmhouse.

Spray and Combustion Characteristics of a Dump-type Ramjet Combustor

Choong-Won Lee,Hyun-Jin Youn,Su-Yeon Moon,Chang-Hyun Sohn 대한기계학회 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.12

Spray and combustion characteristics of a dump-type ram-combustor equipped with a V­gutter flame holder were experimentally investigated. Spray penetrations with a change in airstream velocity, air stream temperature, and dynamic pressure ratio were measured to clarify the spray characteristics of a liquid jet injected into the subsonic vitiated airstream, which maintains a highly uniform velocity and temperature. An empirical equation was modified from Inamura's equation to compensate for experimental conditions. In the case of insufficient penetration, the flame in the ram-combustor was unstable, and vice versus in the case of sufficient penetration. When the flame holder was not equipped, the temperature at the center of the ram-combustor had a tendency to decrease due to the low penetration and insufficient mixing. Therefore, the temperature distribution was slanted to the low wall of the ram­combustor. These trends gradually disappeared as the length of the combustor became longer and the flame holder was equipped. Combustion efficiency increased when the length of the combustor was long and the flame holder was equipped. Especially, the effect of the flame holder was more dominant than that of the combustor length in light of combustion efficiency.

Spray Characteristics of a Liquid-fueled Ramjet Engine under High Pressure Air-stream Conditions

Choong-Won Lee,Hyun-Jin Youn,Tae-Hee Lee,Geun-sun Lee 한국추진공학회 2004 한국추진공학회 학술대회논문집 Vol.2004 No.5

BOOTSTRAPPING GENERALIZED LINEAR MODELS WITH RANDOM REGRESSORS

Lee, Kee-Won,Kim, Choong-Rak,Sohn, Keon-Tae,Jeong, Kwang-Mo The Korean Statistical Society 1992 Journal of the Korean Statistical Society Vol.21 No.1

The generalized linear models with random regrssors case are studied for bootstrapping. Only the natural link functions are considered. It is shown that the bootstrap approximation to the distribution of the maximum likelihood estimators is valid for almost all sample sequences. A slight extension of this model is also considered.

N-Region Addition in Immunoglobulin Kappa Light Chains in B Cell Subsets in Rheumatoid Arthritis

Choong Won Lee,S. Louis Bridges, Jr 대한면역학회 2003 Immune Network Vol.3 No.2

N Region Addition in lmmunoglobulin Kappa Light Chains in B Cell Subsets in Rheumatoid Arthriris Evidence for Over-expression of TDT in B lineage

Lee, Choong Won,S.Louis Bridges,Jr. 침례병원 2003 浸禮病院學術誌 Vol.19 No.-