• Proceedings of the Korea Society for Simulation Conference
• /
• 1998.03a
• /
• pp.50-55
• /
• 1998

In this paper we use discrete simulation method to get the criteria of system evaluation required in the case of designing the complicated probabilistic event system having discrete probabilistic variables and to search the effective and reliable alternatives to satisfy the objective value of the given system through on-line, single run within the short time period. If we find the alternative we construct the algorithm which change values of decision variables and determining alternative by using the stopping algorithm which end the simulation in the steady state of system. In order to prevent the loss of data when we analyze the acquired design alternative in the steady state we provide the background of the estimation of the autoregressive model and mean and confidence interval for evaluating correctly the objective function obtained by the small amount of output data through the short time period simulation.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 2001.04a
• /
• pp.223-232
• /
• 2001

This paper describes Genetic Algorithm-Based Relay Search Method, RS-GA, which is developed in this study to search the multiple design variables in the design space. The RS-GA based on Simple-GA consists of some functions to search many variables from some wide variable space. It repeats a Simple-GA, that is the convergence process of the Simple-GA, which makes many time reiteration itself. From the results of the numerical studies, it was actually found that RS-GA can search all peak-variable from the 2D functions including 5 peaks. Finally, RS-GA applied for design-strengthening problems in composite plate girder bridges using the external prestressing technique is also verified.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 1997.10a
• /
• pp.171-178
• /
• 1997

This paper describes the application of discretized continuum-type optimality criteria (DCOC) for the multispan partially prestressed concrete beams. The cost of construction as objective function which includes the costs of concrete, prestressing steel, non-prestressing steel and formwork is minimized. The design constraints include limits on the maximum deflection, flexural and shear strengths, in addition to ductility requirements, and upper and lower bounds on design variables as stipulated by the design code. Based on Kuhn-Tucker necessary conditions, the optimality criteria are explicitly derived in terms of the design variables-effective depth, eccentricity of prestressing steel and non-prestressing steel ratio. The prestressing profile is prescribed by parabolic functions. The self-weight of the structure is included in the equilibrium equation of the real system, as is the secondary effect resulting from the prestressing force. Two numerical examples of multispan PPC beams with rectangular cross-section are solved to show the applicability and efficiency fo the DCOC-based technique.

• Journal of Family Resource Management and Policy Review
• /
• v.19 no.4
• /
• pp.141-161
• /
• 2015

The purpose of this study was to explore the differences in time perspective by socio-demographic variables and to investigate the effect of time perspective on time management and life satisfaction for college students. Questionnaires including time perspective, time management, and life satisfaction scales were used for this study. The survey data from 382 college students were analyzed by frequency, percentage, mean, standard deviation, t-test, ANOVA, Duncan test, Pearson's correlation analysis, and stepwise regression. The time perspective, composed of four factors future insensibility and present, past, and future orientation, differed according to the sex, academic grade, and specialty of the college students. The time perspective of the college students and the socioeconomic status of their households were investigated as effective variables on time management and life satisfaction. Based on these results, the implications for research and policy on the time perspective of college students were discussed.

• Korean Management Science Review
• /
• v.24 no.2
• /
• pp.73-80
• /
• 2007

Robust Design(RD) is a cost-effective methodology to determine the optimal settings of control factors that make a product performance insensitive to the influence of noise factors. To better facilitate the robust design optimization, a dual response surface approach, which models both the process mean and standard deviation as separate response surfaces, has been successfully accepted by researchers and practitioners. However, the construction of response surface approximations has been limited to problems with only a few variables, mainly due to an excessive number of experimental runs necessary to fit sufficiently accurate models. In this regard, an innovative response surface approach has been proposed to investigate robust design optimization problems with larger number of variables. Response surfaces for process mean and standard deviation are partitioned and estimated based on the multi-level approximation method, which may reduce the number of experimental runs necessary for fitting response surface models to a great extent. The applicability and usefulness of proposed approach have been demonstrated through an illustrative example.

• Journal of Applied Tourism Food and Beverage Management and Research
• /
• v.15 no.2
• /
• pp.99-122
• /
• 2004

The purposes of this study and to develop the model to prove the structural relationship between service orientation and customer satisfaction, to find out the mediation variables between them, to survey and analyze their roles empirically, and to prove the probability of applying the strategic frame to all hotels in Korea. For these purposes, the author developed a structural model which consists of six variables. The data were collected from 7 hotels and analyzed with AMOS program. The findings can be summarized ad follows : First, the higher customer expectation, the lower customer satisfaction. Second, the higher customer expectation, the higher customer perceived quality. Third, the higher customer perceived qualify, the higher customer satisfaction. Fourth, the higher customer perceived quality, the higher customer perceived value. Sixth, the higher customer satisfaction, the lower customer complaint. Seventh, the higher customer satisfaction, the higher customer loyalty.

• Journal of Family Resource Management and Policy Review
• /
• v.3 no.2
• /
• pp.17-32
• /
• 1999

The purpose of this study is to investigate bases on the employed wives’family financial management types according to family financial management types according to family financial management project and performance. And it’s related variables will provide the basic information for the program which aids in the improvement of the employed wives’family financial management skills and family financial counseling. The major findings were as follows: 1) The total mean score of respondent’s family financial management was 3.54 out of 5. And the mean score of project and performance was respectively 3.42 and 3.62. 2) Among family financial management types, effective type, project-centered type, performance-centered type, ineffective type were respectively 38.7%, 16.4%, 13.2%, 31.7%. 3) The family financial management type of the employed wives was affected by information utilization the degree of communication, type of occupation, and job attitudes.

• Journal of Electrical Engineering and Technology
• /
• v.7 no.1
• /
• pp.46-50
• /
• 2012

The current paper presents an effective methodology for assessing the reliability of electromagnetic designs when considering uncertainties of design variables. To achieve this goal, the reliability index approach based on the first-order reliability method is adopted to deal with probabilistic constraint functions, which are expressed in terms of random design variables. The proposed method is applied to three different designs of a superconducting magnetic energy storage system that corresponds to initial, deterministic, and roust designs. The validity and efficiency of the method is investigated with reference values obtained from Monte Carlo simulation.

• English Language & Literature Teaching
• /
• v.11 no.2
• /
• pp.91-110
• /
• 2005

Many Korean EFL (English as a Foreign Language) students do not have sufficient opportunity to develop cultural knowledge and information in their classrooms. EFL teachers also tend to ignore the teaching of culture. Even though culture is taught, it simply tends to deliver "fact-only" information from the viewpoint of a "tourist level rather than cultural awareness by comparing native with target cultural references. Teaching target cultural knowledge and information should be delivered within the native cultural frame, and teaching of culture must be an integral part of teaching and learning English. The research methodology was quantitative. Quantitative data was gathered from 83 Korean EFL teachers and 286 EFL students by questionnaire. Findings indicated that three of these independent variables (cultural inequality, English-only instruction, and Unoism) were significantly and inversely related to integration of culture.

• Computers and Concrete
• /
• v.1 no.1
• /
• pp.31-46
• /
• 2004

A methodology is presented for computing stresses in structural concrete members exposed to fire. Coupled heat and moisture migration simulations are used to establish temperature, pore pressure, and liquid-saturation state variables within near-surface zones of heated concrete members. Particular attention is placed on the use of coupled heat and multiphase fluid flow simulations to study phenomena such as moisture-clogging. Once the state variables are determined, a procedure for combining the effects of thermal dilation, mechanical loads, pore pressure, and boundary conditions is proposed and demonstrated. Combined stresses are computed for varying displacement boundary conditions using data obtained from coupled heat and moisture flow simulations. These stresses are then compared to stresses computed from thermal analyses in which moisture effects are omitted. The results demonstrate that moisture migration has a significant influence on the development of thermal stresses.