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상온 및 고온환경에서 단조강의 피로수명 향상을 위한 최적피닝강도 탐색
조병진,김태형,정성균 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-
Fatigue Characteristics of shot peened SF50A was investigated in this paper. Optimum-peening intensity was examined and fatigue test was accomplished under room and high temperature environment. The fatigue test was performed by rotary bending fatigue machine, and applied stress was 358MPa. Experimental results show that the optimum-peening intensity is 0.35mmA~0.41mmA at room temperature. The fatigue life of SF50A specimens under the room temperature was increased about 42% by shot peening. The fatigue strength of shot peened and unpeened specimens was greatly reduced under the high temperature condition.
조병진,오경환,박기민 경상대학교 환경보전연구소 1993 環境保全硏究所報 Vol.1 No.1
The actual administrative conditions of the environment research institutes attached to the universities and colleges were investigated by means of the questionnaire to propose the reference data for the reasonable and effective management of them. The majority of them were established after 1981, and half of them are unregistered. The retention rates of the full-time researchers and the attendants was 55%, and that of the official facilities was high, but the equipments for analysis and measurement were poorly furnished as 15%. Annual mean amounts of the fund for management and research are less than ten million and more than thirty million won, respectively. Therefore their major roles are limited to consultations, supervising academic conferences, and collecting research materials because of the fund limitations. Half of them distribute their own publications, and subscribe for few scientific journals regularly. There are many obstracles in the management of institutes such as lack of funds, deficient administrative support of the college authorities, deficiencies of full-time researchers, attendants, and equipments for analysis and measurement.
趙炳辰,河池利彦,倫忠燮 경상대학교 환경보전연구소 1994 環境保全硏究所報 Vol.2 No.1
A method for predicting the salt water exclusion process or the time-varying salinity in an estuarine reservoir system is presented, which may be a powerful tool when the reservoir flow is well mixed and predominently one-dimentional. The method that views the reservoir as a one-dimentionally distributed system is a great improvement over the one based upon the salt balance equation for a lumped system. Coupling the open channel flow equations with the convection-dispersion equation, the flow of water and the transport of water density are simultaneously analyzed in terms of the interaction between water movement and density. The quasilinealized basic equations to be solved are cast into numerical versions by use of the finite element method and the implicit time integration scheme to build a versatile and tough model for salinity and flow prediction. Inclusion of time-dependent local injection of withdrawal of water and salt in the model is done by boundary and lateral flow treatments. The method presented in this paper is applied to the new Man-Keum estuarine reservoir in Korea, now under construction. The result of 5 year consecutive analysis after the construction of the polder dikes shows that the predicted salinity is allowable for irrigation at the sites of pumping stations located far downstream of the two main rivers, Man-Kyeong and Dong-Jin.