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남광현,오위영,Nam, Kwang-Hyun,Oh, Wee-Yeong 한국해양과학기술원 2003 Ocean and Polar Research Vol.25 No.4
The purpose of this paper is to investigate economic feasibility of creating artificial tidal flats using cost-benefit analyses. We assumed that the cost factors are associated with designing, construction and monitoring, and the benefit factors are associated with fisheries production, habitation, prevention of disasters, water purification, aesthetic value and existence value. First, for analyzing economic feasibility, the scenario suggests that a design can be made in a year, construction can be completed in three years and monitoring must be made for 20 years. Assuming the discount rate of 7.5%, economic feasibility analyses showed that B/C was 2.26 and IRR was 14.50. This study indicated there is economic validity of implementing creation of artificial tidal flat. In addition, we carried out a sensitivity analysis at the change of discount rate and restoration rate. The result of sensitivity analysis clearly showed that economic validity is low when discount rate is over 15%, and changes in restoration rate did not significantly effect on the economic validity.
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南光鉉,李大澈 한밭대학교 건설안전기술연구소 2003 건설안전기술논문집 Vol.3 No.-
This study is to determine the formula for river width of small streams in Sabgyo River Basin by looking into hydrological and topographical characteristic factors. This study also is to examine the feasibility of the formula for the actual practice comparing with the existing formulas. The design flood discharge, drainage area and stream length for the small streams in the Sabgyo River basin are shown the relationships as L=3.116+0,130*A and Q=623.087+192.648*A. The formulas for the design-width of small streams in Sabgyo River basin are suggested, on the basis of the flood discharge, drainage area, and bed slope, as B_(Q)=20.723+0.005(Q/√(I)) and B_(A)=30.747+0.035(A/√(I)), respectively. The newly set-up-formula in this study is more accurate and applicable in deciding the flood discharge and drainage than the existing formulas. Therefore, I argue that this equation can be applied to determine the design-width of small streams in fluvial river basin.
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南光鉉 서울大學校 保建大學院 1973 公衆保健雜誌 Vol.10 No.1
The prevalence of the major psychoses was studied by means of an intensive census visiting method in a Korean rural village (Wa-chon Myun) which is located 24km from Taegu city. All the residents in the village were 6,846 in number and majority of them(87%) were below the middle school in educational level. The study was performed in September 1972 and the following results were obtained. 1. Twenty-three cases of schizophrenia, 2 cases of manic depressive psychoses, 11 cases of epilepsy and none of general paresis were observed from the total population of 6,846. Thus the prevalence rate was 0.336% for schizophrenia, 0.029% for manic depressive psychoses, 0.16% for epilepsy. 2. The corrected prevalence rate calculated by Weinberg's method was 0.873% (age 16-40) for schizophrenia, 0.1% (age 21-50) for manic depressive psychoses, and 0.264% (age 5-30) for epilepsy. 3. The age of the onset of each disorder was rather coincident with the age range of susceptibility ordinarily adopted by other investigators. 4. In more than two third of patients, they were left alone without any treatment or interest and a hopeless chronic course. 5. Religion does not influence upon the prevalence of psychoses in this study. 6. Marital lives of patients were relatively not disturbed by the psychotic state and the divorce problem is taken rather out of question by the parther in most cases.
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남광현,권석재,오위영 한국해양과학기술원 2004 Ocean and Polar Research Vol.26 No.2
The purpose of this paper is to investigate economic feasibility of manganese nodules in the area obtained by Korea (Clarion-Clipperton Fracture Zone). We assumed that the production scale of manganese nodules were 3.0 MT (million ton(dry)) or 1.5 MT, and estimated the capital costs and operating costs by sectors such as exploration, mining, transportation, and metallurgical process. The capital cost and operating cost evaluation reflects the latest technical practices. First, for analyzing economic feasibility, the scenario suggests that the production of 4 metals can be made for 25 years. It is assumed that the discount rate, equity capital, and tax rate are each 8.0%, 50%, and 27%. 3.0 MT of manganese nodule were mined, economic feasibility analyses showed that IRR was 12.8 and pay-back period was 9.2 years, and when 1.5 MT of manganese nodule were mined, economic feasibility analyses showed that IRR was 4.0 and pay-back period was 11.8 years. This study shows that there exists economic feasibility when 3.0 MT of manganese are produced. In addition, we carried out a sensitivity analysis at the change of cobalt price on mining 1.5 MT. The result of sensitivity analysis shows that economic feasibility goes up as increase of cobalt price (50% up).
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남광현,이승수 충북대학교 건설기술연구소 2003 建設技術論文集 Vol.22 No.1
An enactment of Korean Standard Design Loads for Buildings in 2000 by Ministry of Construction and Transportation has renovated wind load standard in many aspects; the refinement of much of fundamental data on more robust and theoretical foundations and the consideration of diverse cases for wind-to-building situations. At the stage of building design, many parameters are variable, which affect the estimation of wind loads. However, the procedure of wind load estimation from the standard is very tedious and troublesome, even erroneous. Hence, the automation of the wind load estimating procedure is of importance to increase both efficiency and accuracy in engineering and business. This paper present the development of online system to estimate wind loads on buildings. The web-based program has been developed in two part: one for server side using ASP and the other for client side using HTML and Javascript. A client’s request accompanied with necessary information invokes the server-side program through network and the wind load estimation computed in the server returns in tabulated forms. Most of the fundamental data in the standard are stored in a database using Microsoft. Access, which is repeatedly used in the wind load estimation using SQL. With the developed online system for wind load estimation, it is expected that work efficiency and accuracy is increased and cost is reduced.
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盧明來,南光鉉 순천향대학교 1981 논문집 Vol.4 No.1
The Korean Standard MMPI was performed on both the 1027 violent criminal acting boys among the other delinquent boy groups who were institutionalized to the Seoul Juvenile Detention and Classification Center and the 317 normal high school boys sellected as normal control group. These 1027 violent criminal boys were classified into 4 groups according to their nature of criminals, such as, 1) more than 2 delinquent boy's forceful robber group(robber group) : 144 subjects. 2) violent robber and injured group: 119 subjects. 3) violent acting group: 656 subjects. 4) commit rape group : 108 subjects. In addition, 1347 subjects of Ro and Nam's stealing group subject were included in above mentioned violent criminal acting group and then pattern analysis of MMPI was performed on total 2401 subjects comparing with the normal control group. Also. the delinquent scales of robber group, violent acting group, commit rape group and other total delinquent group were extracted by the method of item analysis. The results were as follows: 1) The subscale of L, K, Hs. D, Hy, Pd, are statiscally higher in all violent criminal acting groups compared with the normal control group. Above findings revealed a great difference in Re and Nam's study of stealing group (In stealing group, Pa, Pt. Sc, Si, scales were elevated compared with the normal control group) . 2) 19.56% of the normal control group, 28.47% of the robber group, 25.21 % of the violent robber and injured group, 28.20% of the violent acting group, 30.56% of the commit rape group. 32.44% of the total delinquent group revealed neurotic or psychotic traits. 3) No significant differences were noted between the total violent criminal acting group and normal control group on their anxious state. This result revealed that all the violent criminal's anxious state was same as the normal control group or the anxiety threshold of the violent criminals was higher compared with the normal control group. 4) The internalization ratio was higher on the all violent criminal acting groups compared with the normal control group. This trait was interpreted that both groups act out their anxiety and tension state to the external world, but the degree of acting out was lower in violent criminal acting group. Meanwhile, the commit rape showed no significant differences compared with the normal control group. 5) On item analysis concerned with the- delinquent scale, 46 delinquent stales in robber group. 50 scales in commit rape group, 38 scales in violent acting group, and 27 scales in all violent criminal acting group were obtained.
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