• 한국시뮬레이션학회논문지
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• 제14권3호
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• pp.91-100
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• 2005

Grid computing is widely applicable to various fields of industry including process control and manufacturing, military command and control, transportation management, and so on. In a viewpoint of application area, grid computing can be classified to three aspects that are computational grid, data grid and access grid. This paper focuses on computational grid which handles complex and large-scale computing problems. Computational grid is characterized by system dynamics which handles a variety of processors and jobs on continuous time. To solve problems of system complexity and reliability due to complex system dynamics, computational grid needs scheduling policies that allocate various jobs to proper processors and decide processing orders of allocated jobs. This paper proposes a service prediction-based job scheduling model and present its scheduling algorithm that is applicable for computational grid. The service prediction-based job scheduling model can minimize overall system execution time since the model predicts the next processing time of each processing component and distributes a job to a processing component with minimum processing time. This paper implements the job scheduling model on the DEVS modeling and simulation environment and evaluates its efficiency and reliability. Empirical results, which are compared to conventional scheduling policies, show the usefulness of service prediction-based job scheduling.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2005년도 춘계학술대회 논문집
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• pp.29-33
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• 2005

Grid computing is widely applicable to various fields of industry including process control and manufacturing, military command and control, transportation management, and so on. In a viewpoint of application area, grid computing can be classified to three aspects that are computational grid, data grid and access grid. This paper focuses on computational grid which handles complex and large-scale computing problems. Computational grid is characterized by system dynamics which handles a variety of processors and jobs on continuous time. To solve problems of system complexity and reliability due to complex system dynamics, computational grid needs scheduling policies that allocate various jobs to proper processors and decide processing orders of allocated jobs. This paper proposes the service prediction-based job scheduling model and present its algorithm that is applicable for computational grid. The service prediction-based job scheduling model can minimize overall system execution time since the model predicts a processing time of each processing component and distributes a job to processing component with minimum processing time. This paper implements the job scheduling model on the DEVSJAVA modeling and simulation environment and simulates with a case study to evaluate its efficiency and reliability Empirical results, which are compared to the conventional scheduling policies such as the random scheduling and the round-robin scheduling, show the usefulness of service prediction-based job scheduling.

• Journal of Astronomy and Space Sciences
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• 제26권4호
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• pp.635-642
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• 2009

This paper describes the Flight Dynamics Automation (FDA) system for COMS Flight Dynamics System (FDS) and its test result in terms of the performance of the automation jobs. FDA controls the flight dynamics functions such as orbit determination, orbit prediction, event prediction, and fuel accounting. The designed FDA is independent from the specific characteristics which are defined by spacecraft manufacturer or specific satellite missions. Therefore, FDA could easily links its autonomous job control functions to any satellite mission control system with some interface modification. By adding autonomous system along with flight dynamics system, it decreases the operator's tedious and repeated jobs but increase the usability and reliability of the system. Therefore, FDA is used to improve the completeness of whole mission control system's quality. The FDA is applied to the real flight dynamics system of a geostationary satellite, COMS and the experimental test is performed. The experimental result shows the stability and reliability of the mission control operations through the automatic job control.

• 한국산학경영학회:학술대회논문집
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• 한국산학경영학회 2005년도 추계학술발표대회 발표논문집
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• pp.1-9
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• 2005

Job search research has been criticized for failing to study the dynamics and change of the job search process. A lot of previous researches have used cross-sectional designs and treated job search as a static process. As a result, job search research has failed to examine how job seekers' behaviors change during the course of their search. This paper examined changes In job search behaviors(preparatory and active job search behavior, and job search intensity) and the effects of individual difference variables(self-esteem, self-efficacy, extroversion, agreeableness, conscientiousness, openness) on job search behaviors. Data were gathered from 404 university students who had not found employment at the time of beginning of second semester The results of t-test pairs indicated that job seeking students increased their preparatory job search behavior and active job search behavior, but didn't job search intensity. The results of multiple regression showed that self-efficacy had strong relationship with preparatory and active job search behavior, and job search intensity, but self-esteem had not any relationship with them. Among big-5 personality, extroversion had relationship with active job search behavior and job search intensity, and agreeableness only with job search intensity.

• 노동경제논집
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• 제19권2호
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• pp.175-194
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• 1996

• 한국시스템다이내믹스연구
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• 제3권2호
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• pp.49-68
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• 2002

The intent of this study is to develop system dynamics model for assessment of organizational and human factors in nuclear power plant which can contribute to secure the nuclear safety. Previous studies are classified into two major approaches. One is engineering approach such as ergonomics and probability safety assessment(PSA). The other is social science approach such like sociology, organization theory and psychology. Both have contributed to find organization and human factors and to present guideline to lessen human error in NPP. But, since these methodologies assume that relationship among factors is independent they don't explain the interactions among factors or variables in NPP. To overcome these limits, we have developed system dynamics model which can show cause and effect among factors and quantify organizational and human factors. The model we developed is composed of 16 functions of job process in nuclear power, and shows interactions among various factors which affects employees' productivity and job quality. Handling variables such like degree of leadership, adjustment of number of employee, and workload in each department, users can simulate various situations in nuclear power plant in the organization side. Through simulation, user can get insight to improve safety in plants and to find managerial tools in the organization and human side. Analyzing pattern of variables, users can get knowledge of their organization structure, and understand stands of other departments or employees. Ultimately they can build learning organization to secure optimal safety in nuclear power plant.

• 인터넷정보학회논문지
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• 제17권4호
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• pp.161-172
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• 2016

본 연구는 IT 전문가들이 행복하게 직무를 수행함에 있어 필요한 요인들이 무엇인지를 동태적이고 구조적인 Causal Loop Diagram을 통해 파악하고 개인적, 조직적, 정부 차원의 행복 촉진 요인들을 제시하였다. 본 연구에 적용한 시스템 다이내믹스 방법론은 수치적인 정확성을 추구하는 대신에 상식적 피드백 구조의 CLD를 통해 행태의 개연성을 추구하는 질적 연구기법이다. 6개의 CLD에서 직무만족, 조직몰입, 긍정감성, 부정감성, 우호적 관계, 직무지속의도 등의 핵심요인들과 그들에 영향을 미치는 다수의 원인요인들이 IT 전문가들의 직무 행복을 파악하기 위한 통합적 시각으로 조명되었다. 본 연구는 변수간의 단편적인 관계를 살펴보는 양적 연구에서 나아가 전체 요인들을 상호 구조적이고 현실적인 시각으로 살펴보는 탐색적 연구로서 의미가 있다.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2006년도 PARALLEL CFD 2006
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• pp.116-120
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• 2006

• 디지털융복합연구
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• 제14권6호
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• pp.219-235
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• 2016

본 연구는 융 복합 시대의 중소기업 성과요인이 근로자의 직급에 따라 어떻게 다르게 나타나는지를 연구해 보고자 하였다. 또한 성과요인이 개별적으로 어떤 조직성과에 영향을 미치는가에 대한 많은 연구와는 다르게 통합적으로 접근하고자 하였다. 특히나 벤처기업 성과의 요인을 변혁적 역동성 요인과 교환적 역동성 요인으로 구분하고 그중 변혁적 역동성 요인이 조직몰입과 직무만족에 미치는 영향에 관한 관점으로 접근하였다. 변혁적 역동성 요인으로는 사명 및 전략, CEO리더십, 관리자리더십, 조직문화등 4가지를 변인으로 하여 하였다. 연구는 Burke와 Litwin(1992)의 조직개발모형 이론을 토대로 하였다. 근로자를 관리직과 생산직으로 구분하였다. 총 9개의 제조업체에 종사하는 근로자 630명으로부터 자료를 취득하여 분석하였다. Burke와 Litwin(1992)이론에 근거한 조직 변인의 평균은 변혁적 변인은 조직몰입 및 직무만족에 유의한 것으로 나나났다. 상관분석 결과 변혁적 역동성 변인이 조직몰입 및 직무만족에 영향을 미치데 있어 직급은 조절효과가 있는 것으로 나타났다.

• 동력기계공학회지
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• 제7권3호
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• pp.61-68
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• 2003

Steering characteristics is an important factor in the evaluation of vehicle quality. To estimate steering characteristics in the vehicle conceptual design stage, vehicle dynamics simulation methods are very efficient. However, it is often difficult to simulate vehicle dynamics for the specific driving scenarios in open-loop driving environment. An efficient driver-in-the-loop vehicle model will be efficient for this job. A good tire model is also very important for the accurate vehicle dynamics simulation. In this research, a driver model is used to simulate vehicle steering dynamics for a 8-dof vehicle model with STI(Systems Technology, Inc.) tire model. For the demonstration of this model, a SUV(sports utility vehicle) and a sedan were simulated.