본 연구는 현장에서 사용된 리더십의 다면평가에서 평가자 수준(상사, 동료, 부하)별로 리더십의 평가에서 사용하는 평가조망을 탐색하였다. 150명의 경영자 후보를 피평가자로 하고 각자의 상사 1명, 동료 2명, 그리고 부하 10명이 평가자로 참여하였다. 피평가자의 리더십은 리더십 경쟁가치모델(Quinn, 1988)에서 사용된 네 가지 리더 행동 즉 성과지향 행동, 관계지향 행동, 안정지향 행동, 그리고 혁신지향 행동의 준거에서 평가되었다. 연구 결과, 리더 행동의 평가에서 평가자 수준간 상관이 매우 낮게 나타났으며, 그 원인이 평가자 수준에 따라 범하는 평정오류의 차이와 평가자 수준에 따라 채택하는 리더십 준거가 다르다는 결과를 관찰하였다. 상사는 성과와 혁신 조망을, 부하는 관계와 안정 조망을, 그리고 동료는 네 가지 조망을 모두 채택하는 경향이 있었다. 이 결과를 기초로 다면평가의 연구에서 심리측정적 접근뿐만 아니라, 사회-조직적 접근의 필요성을 논의하였다.
The applicability of rice husk fiber as a raw material for eco-friendly pulp mold was evaluated in this study. The higher demand of environmental friendly packaging material resulted in the more interest for the natural fiber based pulp mold. The rice husk which is an abundant agricultural byproduct in Asia could be defiberized by an alkaline digestion process. The changes in the pulp mold making process and the properties of pulp mold by the addition of the rice husk were investigated. The addition of rice husk fiber to the pulp mold made with OCC or UBKP resulted in the increase in drainage at the pulp mold forming process. In case of UBKP pulp mold, the addition of rice husk fiber increased the drying efficiency after pulp mold forming since the structure of pulp mold became more bulkier by the addition of the rice husk fiber. Those results showed the rice husk fiber could be applied to the pulp mold manufacturing as one of the eco-friendly natural fiber resources.
It is prescribed in the KRTA Design Specifications(2010) that the allowable stress of HSB800 is 55% of the yield strength due to the absence of the criteria regarding structural performance evaluation and residual stress, though the allowable stress of HSB500 and HSB600 is standardized to 60% of the yield strength in the specification. However, taking the difference of the initial deflection and residual stress between HSB and conventional structural steel into account, the assessment of the load-carrying capacity for compressive and lateral-torsional buckling is strongly demanded. In this study, the assessment of load-carrying capacity for lateral-torsional buckling was conducted with finite element analysis and the experimental tests of two girders. Consequently, the usability of HSB800 with 55% of yield strength ratio has been validated based on the assessment of load-carrying capacity.
New high strength bolts are required due to the development of the high strength steel, the ultra-thick steel plates, and the long-span bridge, though high strength bolts with tensile strength of 1,000 ㎫ are mainly used in construction site of every country. Consequently, in this study, we estimated the fatigue strength by performing fatigue test of slip-resistant splices with slip coefficients applying the newly developed F13T high strength bolts. The fatigue test satisfied the Category B requirements with the fatigue strength of slip-resistant splices. Also we analyzed the fatigue fracture characteristics of slip-resistant splices.
The ER-Valve characteristics are evaluated by changing the intensity of the electric field and the number of electrode. The ER-Valves and pressure drop check method are considered to be applied to the fluid power industry. The ER-Valves and pressure drop check method are considered to be applied to the mechatronics system. Using the manufactured pressure control valve, a one-link manipulator with FHA(Flexible Hydraulic Actuator) is driven. As a result, it is experimentally confirmed that the pressure control valve using ER fluids is applicable to use in driving actuator.
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