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기업이 생존하고 경쟁우위를 획득하기 위해서는 전통적인 조직운영의 방식에서 탈피하여 조직 구성원 모두가 가치사슬을 강화시키는 혁신과정에 참여하고 몰입할 수 있는 대안적 조직운영 방식의 실천이 요구된다. 셀프리더십은 치열한 경쟁적 환경 속에서 경쟁우위의 지속가능성을 담보해 주는 혁신행동과 혁신과정의 추동요인이라고 할 수 있으며, 혁신행동과 가치혁신과정에의 참여는 조직 구성원 개개인 스스로가 작업과정에서 창의적인 아이디어의 창출을 하는 주도자임과 동시에 실행자로서 자발적인 의지와 능력을 갖추고 있어야 효과적일 수 있는데, 이러한 과정은 곧 셀프리더십이라고 할 수 있다. 이에 본 연구는 중소기업의 종업원을 대상으로 셀프리더십이 직무성과에 미치는 영향과 그 사이에서 의미성의 조절효과를 검증하고자 하였다. 분석결과 셀프리더십은 직무성과를 촉진하는 원인 변인으로 확인되었으며, 의미성은 셀프리더십과 직무성과의 관계에서 조절효과가 있는 것으로 확인되었다. 본 연구의 시사점은 연구모델의 측면에서는 셀프리더십을 하위요인으로 구분하여 결과변인과 조절변인의 효과를 검정하였다는 것이며, 연구결과의 측면에서는 직무성과 향상을 위한 셀프리더십 개발의 실천적 방향을 제시하였다는 것이다. To survive and gain a competitive edge, an alternative organizational operation method is required to participate and engage in an innovative process that strengthens the value chain, away from the traditional organizational methods. Self-contained innovation practices and the pursuit of innovation processes that ensure the sustainability of competition in a competitive environment. This study examined and analyzed the results of self-leadership on job performance and the moderating effect of meaning aimed at the employees of SMEs. In the research results, Self-leadership was identified as a causal factor promoting job performance and meaning was found to have a moderating effect on the relationship between self-leadership and job performance. The purpose of this study is to examine the theoretical implications of presenting a new model studying the moderating effects of job performance on the sub-dimensions of self-leadership and to suggest the role of self-leadership of employees to improve job performance.
Hydraulic generator plays more important roles as a renewable clean energy in improving stability. As hydraulic generator enjoys strong nonlinear properties, traditional linearized control method may holds worse adaptability for vary disturbances. In order to solve the problem, a Nonlinear Equivalent Input Disturbance Coordinated Control (NEIDCC) method is proposed in this paper. The objective functions related to system control performance are frstly determined. Then the multi-objective equations satisfying the Brunovsky normal form are derived, by which the nonlinear control problem is transformed to linear space to be solved. The nonlinear equivalent control law is obtained from the linear law by calculating the Γ derivative of the objective functions. When the system is subjected to diferent disturbances, the designed NEIDCC control law supports dynamic damping by observing the disturbance to stabilize the oscillations. As a result, the control system holds good performance. The simulation results of the designed hydraulic turbine generator control system demonstrate the efectiveness of the NEIDCC method.
This paper presents a series of physical modelling tests of jacked-pile penetration into sand, combining the transparent soil and incremental reliability-guided particle image velocimetry, which provides a non-intrusively internal deformation measurement approach to monitor the internal movement of soil caused by jacked-pile penetration. The difference between the full-model test and the half-model test was analyzed quantitatively for the first time. This paper aims to provide some new insight into the penetration mechanisms of different shapes of pile tip. In addition, the phenomenon of meta-stable sand plug in the process of jacked-pile penetration was studied by means of the method of partial replacement with dyed particles. Experimental evidence has shown that the boundary and interaction effect causes the experimental phenomenon of the half-model test to be different from the true condition. The shape effect of pile tip on the governing penetration mechanisms was discussed, and the disturbance effect of different shapes of pile tip was evaluated and compared based on a large number of model tests and published literatures. The paper intuitively demonstrates that the different penetration mechanism of flat-ended pile and cone-ended pile is mainly due to the formation of the meta-stable sand plug beneath the pile tip.
To study the cylinder motion characteristics, cylinder and shaft sleeve stress characteristics of cylinder stroke and return process influenced by different shaft sleeve structure, the cylinders with non-chamfering shaft sleeve, C0.3 chamfering shaft sleeve and R0.3 round corner shaft sleeve were used for simulation of cylinder stroke and return process. The results show that the piston velocity curves of three kinds of shaft sleeve are identical. Maximum stress of different shaft sleeves fluctuates and maximum stress elements of C0.3 and R0.3 shaft sleeve are similar. When cylinder strokes, maximum stress of cylinder occurs at the end of piston rod connected to the load; the stress of C0.3 shaft sleeve is the lowest. When cylinder returns, maximum stress of cylinder occurs at the shaft sleeve; the stress of C0.3 and R0.3 shaft sleeve differ little and are both lower than that of non-chamfering shaft sleeve. It provides a reference for structure optimization and service life improvement of the cylinder shaft sleeve.
A large-scale shaking table test system and corresponding numerical model are designed to study the seismic characteristics of crossing tunnels. The calculated results are in good agreement with experimental data, both the results suggest that: Loading the El-Centro seismic wave, the maximum acceleration in upper tunnel's crossing center section is located in the crown, the maximum strain is located in the haunch; meanwhile, the maximum acceleration and strain in underpass tunnel's cross center section are both located in the crown. Affected by the underpass tunnel, at the side wall bottom of the upper tunnel, tests data reveal that the crossing center's maximum acceleration is reduced for 30.9% and the strain was enlarged 170% than the normal section. Affected by the upper tunnel, at the haunch of the underpass tunnel, tests data reveal the crossing center's maximum acceleration is enlarged by 10.0% and the strain is 27.2% reduced than the normal section.
The human foot complex kinematic has been widely investigated for understanding the foot mechanism. This study aims to quantify the arthrokinematics on the mid-foot during normal walking by using a bi-planar fluoroscopic (BPF) system. Computed tomography images were acquired from eighteen healthy subjects to reconstruct three-dimensional (3D) models of the talus, calcaneus, navicular and cuboid. Bi-plane fluoroscopic images of the foot were taken during ground walking and 2D/3D registration was performed to quantify the arthrokinematics. Relative velocity vectors on articular surfaces were computed based on the movement of each bone to represent the interaction in the mid-foot joints. In terminal stance, the internal rotation and inversion patterns were observed in the subtalar and talo-navicular joints, respectively. Those rotational patterns were consistent between subjects and occurred at period of 80-90% of stance phase.
Conventional grinding fluid is widely used in grinding process, which results in high consumption and impacting the environment. The promising alternative to conventional dry and fluid coolant application is minimum quantity lubrication (MQL). It is known that the cooling and lubrication performance of the grinding fluid is the key technical area for the success application of MQL grinding process. In this study, Water based Al2O3 nanofluid was applied to grinding process with MQL approach for its excellent convection heat transfer and thermal conductivity properties. The grinding characteristics of hardened AISI 52100 steel were investigated and compared with those of wet, dry and pure water MQL grinding. Experimental results show that water based Al2O3 nanofluid MQL grinding can significantly reduce the grinding temperature, decrease the grinding forces, improve the ground surface morphology and reduce the surface roughness in comparison to pure water MQL grinding. Furthermore, the cooling and lubricating mechanism for nanofluid MQL grinding was discussed in detail.