• 한국콘텐츠학회논문지
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• 제8권7호
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• pp.233-242
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• 2008

종사원의 선발, 교육, 보상, 그리고 평가 등과 같은 영업사원의 관리의 실행은 영업력 관리시스템에 있어서 중요한 위치를 차지하는데, 이는 종사원의 역할 모호성, 직무만족, 그리고 성과 등에 지대한 영향을 미치기 때문이다. 이러한 중요성에도 불구하고 호텔의 영업력 관리시스템에 대한 연구가 미진한 형편이다. 따라서 본 연구에서는 영업력 관리시스템(STD, 교육, 보상, 상사지원 등), 직무태도, 그리고 성과와의 영향 관계를 보다 자세히 파악하고자 하였다. 이를 위해 경로모형과 가설을 설정하고 제시하였다. 본 연구를 통하여 호텔의 영업사원과 이들의 관리를 위한 몇 가지 중요한 사항을 제시하는데 공헌하였다. 즉, 이번 연구는 호텔의 실무책임자들과 연구자들에게 새로운 관점과 시사점을 제시할 수 있었다. 먼저, 학술적 측면에서는 영업력 관리시스템에 관한 새로운 접근 방식을 제시하였다. 둘째로, 실무적 측면을 보면, 종사원의 영업성과와 직무만족을 향상시키고, 역할모호성을 감소시키기 위하여, 관리자는 종사원을 대상으로 격려, 영업에 대한 지도, 그리고 영업 노하우 등에 교육과 행동을 취해야 한다.

• Structural Engineering and Mechanics
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• 제53권3호
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• pp.537-573
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• 2015

Multiple-step beams carrying intermediate lumped masses with/without rotary inertias are widely used in engineering applications, but in the literature for free vibration analysis of such structural systems; Bernoulli-Euler Beam Theory (BEBT) without axial force effect is used. The literature regarding the free vibration analysis of Bernoulli-Euler single-span beams carrying a number of spring-mass systems, Bernoulli-Euler multiple-step and multi-span beams carrying multiple spring-mass systems and multiple point masses are plenty, but that of Timoshenko multiple-step beams carrying intermediate lumped masses and/or rotary inertias with axial force effect is fewer. The purpose of this paper is to utilize Numerical Assembly Technique (NAT) and Differential Transform Method (DTM) to determine the exact natural frequencies and mode shapes of the axial-loaded Timoshenko multiple-step beam carrying a number of intermediate lumped masses and/or rotary inertias. The model allows analyzing the influence of the shear and axial force effects, intermediate lumped masses and rotary inertias on the free vibration analysis of the multiple-step beams by using Timoshenko Beam Theory (TBT). At first, the coefficient matrices for the intermediate lumped mass with rotary inertia, the step change in cross-section, left-end support and right-end support of the multiple-step Timoshenko beam are derived from the analytical solution. After the derivation of the coefficient matrices, NAT is used to establish the overall coefficient matrix for the whole vibrating system. Finally, equating the overall coefficient matrix to zero one determines the natural frequencies of the vibrating system and substituting the corresponding values of integration constants into the related eigenfunctions one determines the associated mode shapes. After the analytical solution, an efficient and easy mathematical technique called DTM is used to solve the differential equations of the motion. The calculated natural frequencies of Timoshenko multiple-step beam carrying intermediate lumped masses and/or rotary inertias for the different values of axial force are given in tables. The first five mode shapes are presented in graphs. The effects of axial force, intermediate lumped masses and rotary inertias on the free vibration analysis of Timoshenko multiple-step beam are investigated.

• 한국산학기술학회논문지
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• 제19권11호
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• pp.182-190
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• 2018

많은 제약기업에서 영업사원들을 위하여 SFA 시스템을 운영하고 있다. SFA 시스템은 영업사원들의 다양한 행동에 활용되고 있는데 국내에서는 SFA 활용성과에 대한 실증분석 연구가 부족한 실정이다. 본 연구에서는 제약회사 영업사원을 대상으로 SFA 시스템의 활용도와 그에 따른 비재무적 성과를 설문을 통해 조사하였다. 조사대상은 제약 영업사원으로 구성된 제약 커뮤니티 회원 347명을 대상으로 2018년 3월 13일부터 4월 30일까지 18일 동안 온라인으로 조사하였다. 유효 응답률은 23.1%(80/347)이었다. 분석 결과 SFA 시스템 활용 수준이 높을수록 비재무적 성과가 높은 것으로 나타났다. 회사 구분별로는 국내 기업보다는 외국계 기업이 활용 수준이 높았다. SFA 활용 수준 항목 중 지원 서비스 항목에 대해 외국기업이 국내 기업보다 1.47점(3.65, 2.18) 높게 나타났고, SFA 성과 항목 중에서는 고객만족도 항목에 대해 외국기업이 국내 기업보다 1.47점(3.16, 1.69) 높게 나타났다. 이는 국내사의 SFA 개발 및 운영방식이 영업사원에 대한 지원 서비스 및 고객만족 중심이 아닌 관리 통제에 중심을 두는 것을 시사한다. 이번 연구를 통하여 국내 기업의 경우 SFA 시스템 운영 시 영업사원 지원 및 고객만족 정보제공 기능이 강화되어야 할 것으로 사료되었다.

• 한국정밀공학회지
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• 제19권12호
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• pp.64-69
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• 2002

In this study, the optimal dynamic isolation system for gas operated combat weapon has been investigated. For this purpose, firstly, the dynamic behavior of human induced by firing operations has been analyzed through a series of experimental works using the devised test setup. The characteristics of linear impulse has been compared under some conditions of support system. In order to design the optimal dynamic isolation system, parameter optimization process has been performed based on the simplified isolation system under constraints of moving displacement and transmitted force. Finally, the performance of the designed dynamic absorbing system has been evaluated by simulation.

• 전기학회논문지
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• 제65권2호
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• pp.365-369
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• 2016

The 350[km/h] catenary system was successfully opened in Honam high speed line. This 350[km/h] catenary system is firstly constructed in South Korea. Therefore the current collection performance of this system should be tested and evaluated by the authority. This paper describes the testings by running of HEMU-430X train and the evaluation criteria and result analysis to determine whether the performance of the catenary is good or not as a verification of catenary-pantograph interface. In detail, the contact force by pantograph, arcs by loss of contact and uplift amount of the catenary support were measured and discussed as a category of the current collection performance.

• Smart Structures and Systems
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• 제19권4호
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• pp.431-439
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• 2017

This investigation is aimed to develop a model of experimental-computation determination of a support moment of a cantilever beam loaded with concentrated force at its end including the optimal choice of coordinates of deflection data points and parameters of transformation of deflection data in case of insufficient accuracy of the assignment of initial parameters (support settlement, angle of rotation of the bearing section) and cantilever beam length. The influence of distribution and characteristics of sensors on the cantilever beam on the accuracy of determining the support moment which improves in the course of transition from the uniform distribution of sensors to optimal non-uniform distribution is shown. On the basis of the theory of inverse problems the method of transformation reduction at numerical differentiation of deflection functions has been studied. For engineering evaluation formulae of uncertainty estimate to determine a support moment of a cantilever beam at predetermined uncertainty of measurements using sensors have been obtained.

• 전기학회논문지
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• 제64권12호
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• pp.1782-1788
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• 2015

In this paper, analysis of the effects for construction tolerances on the current collection performance of high speed catenary system. The height of the contact wire is the geometrical position of the cantilever directly affects the current collection performance. Contact force when the height of the contact wire exceeds the construction tolerance were analyzed. As a result, the maximum contact force was analyzed to more than 350[N] that are recommended by EN50119. And when the geometrical position of the cantilever to exceeds the construction tolerance, the analysis results of uplift at the mast support points, it becomes 127[mm] that are recommended by UIC 799. If the construction tolerances exceeds the reference value, the current collection performance is deteriorated. Therefore, catenary system require high precision construction. In the future, there is a need for continuing research on the tolerance of catenary system in the actual operating state.

• 한국소음진동공학회논문집
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• 제23권10호
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• pp.869-877
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• 2013

Tension force of hanger ropes has been recognized and utilized as an important parameter for health monitoring of suspension bridges. Conventional vibration method based on string theory has been utilized to estimate tension forces of relatively long hanger ropes without any problem, however it is convinced that the vibration method is not applicable for shorter hanger ropes in which the influence of flexural stiffness is not ignorable. Therefore, as an alternative of vibration method, a number of feasibility studies of system identification(SI) technique considering flexural stiffness of the hanger ropes are recently performed. In this study, the influence of support condition of the finite element model utilized for the SI method is investigated with numerical examples. The numerical examples are prepared with the specification of the Kwang-Ahn bridge hanger ropes, and it is revealed that the estimation result of the tension force can be varied from -21.6 % to +35.3 % of the exact value according to the consideration of the support condition of FE model. Therefore, it is concluded that the rotational stiffness of the support spring should be included to the list of the identification parameters of the FE model to improve the result of tension estimation.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 1997년도 제26회 추계학술대회
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• pp.232-238
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• 1997

In this paper, a theoretical method is presented to design a hydraulic control valve system that consist of an important component in the hydraulic snubber. The hydraulic snubber is used essentially to support the piping systems at power plants. To calculate the force due to pressure drop and flow rate in the valve orifice and by-pass hole, Bernoulli equation is used. The Reynolds equation are numerically analyzed in the clearance gap between the valve cone and valve seat to estimate the friction force and leakage flow rate. Based on the detailed theoretical data, we developed successfully the hydraulic snubber for power plants.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1999년도 추계학술대회 논문집 - 한국공작기계학회
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• pp.440-445
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• 1999

One of the important technical issues is how to decrease thermal expansion of ballscrew in proportion to the increase of machining speed. When measuring force of stretch of ballscrew, since not only actual expansion and the value of bending have to be considered, it's impossible to definite the exact value of expansion. In addition, support bearings of ballscrew gain considerable force in axial direction. It also generates thermal expansion on the ballscrew, and deteriorates the bearings. In conclusion, it's impossible to give the pretension enough to absorb the all elongation due to thermal expansion generated during machine running. If gave, bed, column and saddle are all bent to change machine accuracy, and the pretension of support bearing of ballscrew in machine tool.