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손민 亞州大學校 1990 論文集 Vol.13 No.-
We are faced with decisions almost continuously in our personal lives and in business. The accounting has traditionally supplied useful informations for the people who have interest in the accouting entity to make economic decisions. Actually,accounting informations have been provided to the stockholders(investors),creditors,tax authorities and managers as the main information users in Korea. The informations which are useful for reasonable wage level decision and necessary to solve conflicts on distribution of profits in labor relations have not been included in the accounting reports. "The informations of value-added accounting"are valuable to the all kinds of information-users,especially for employees and union representatives because of afore mentioned information needs. This study starts with literature survey and emprical study with questionare obtained from union representatives and managers of enlisted companies to The Korea Stock Exchange Market. This study emprically examines the opinions of the two groups regarding the importance and the need of reporting the value-added accounting informations.It is suggested as well from the analysis of accounting data and financial statements that subtracting method for the calulation of value-added amount is more useful compared to adding method in the predictive ability. The most important assertion of this study is that the value-added accounting information should be inclued in the financial reports in Korea.
손민,김도헌,구자예,장홍빈,강문중,Son, Min,Kim, Dohun,Koo, Jaye,Chang, Hongbeen,Kang, Moonjung 항공우주시스템공학회 2014 항공우주시스템공학회지 Vol.8 No.3
An inner flow of a porous cylinder with partial slots was visualized to study fluidic phenomena in a solid rocket motor. A high-pressure chamber and an air supply system for high flow rate were used. In order to visualize the inner flow, the smoke generator with a cam-driven pump and heaters and high speed camera were adopted. The results of the cylinder type and the partial slot type were compared. As a result, the injected smoke flow in the partial slot type had circumferential fluctuations unlike the cylinder type. It was found that the circumferential flow induced from the partial slots could be the cause of combustion instability and roll torque.
손민,문현구,김양균,이승아 한국자원공학회 2017 Geosystem engineering Vol.20 No.1
This paper suggests a way to evaluate the subsidence risk applicable to abandoned mines. For the subsidence risk evaluation, a diagram modified from Sakurai’s tunnel stability evaluation diagram was developed. To check the feasibility of the modified diagram, two typical mines to represent Korean mines, one gold mine including one steep goaf and one coal mine including two gently sloped goafs were selected and 3-D numerical analyses for the sections in which actual subsidence was occurred were performed. In the numerical analyses, the variation in relative displacement strain between the observation point and reference point placed over the goafs according to the location of the points was analyzed, and the strain was applied to the modified diagram to evaluate the subsidence risk. The results show that the critical factors in the subsidence risk evaluation are the relative locations of the observation and reference points from the goafs as well as joints existing between goafs and the ground.
손민,문현구 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.6
In this study the effects of the stress path on the hydraulic conductivity characteristics during excavation are analyzed using a 2-D discrete element method. The variation of the stress path of the joints at specific locations (the bottom and wall) and around the periphery of an underground opening have been analyzed. The hydraulic stability of the opening is evaluated using the new concept of the trend distance ratio and trend orientation angle. The results from the analysis of the stress path at the bottom and wall of the opening are as follows: Firstly, most of the stress paths of the joints normal to the excavation surface are within the stable zone, and the hydraulic conductivity of the joints is decreased by 21% in average. Secondly, all of the stress paths of the joints parallel to the excavation surface are within the unstable zone, and the hydraulic conductivity is increased to 2.2 times in average. And the variation of the stress path and hydraulic conductivity is further analyzed for those joints having various distances from the opening. The joints parallel to the excavation surface showed the normal stress decreased by 38% and the hydraulic conductivity increased up to 1.9 times in average. This study makes it possible to determine the hydraulic stability of the underground opening excavated in a jointed rock mass.