• Journal of the Korean Mathematical Society
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• v.38 no.5
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• pp.955-970
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• 2001

Two compact Riemannian manifolds are said to be isospectral if the associated Laplace-Beltrami operators have the same eigenvalue spectrum. We describe a method, based on the used of Riemannian submersions, for constructing isospectral manifolds with different local geometry and survey examples constructed through this method.

• Journal of the Korean Society for Library and Information Science
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• v.58 no.1
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• pp.53-82
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• 2024

The purpose of this study is to prepare basic data for establishing a mid-to long-term comprehensive development plan for Gangdong-gu libraries by analyzing the results of a perception survey conducted on local residents, librarians and operators. To achieve the research purpose, a survey was conducted targeting 1,224 library users and non-users in Gangdong-gu. To collect more in-depth opinions, focus group interviews were also conducted with local residents, librarians at public libraries and book cafe libraries, and operators of small libraries. As a result, for the efficient operation of the Gangdong-gu library, it is necessary to establish the role of each library to adjust and reorganize specialization to form an ecosystem, to introduce services and programs without time and space restrictions required in the information society, and to actively promote and attract non-users to the library. The conclusion drawn is that it is necessary to establish a system and support system that can encompass various types of libraries.

• East Asian Journal of Business Economics (EAJBE)
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• v.7 no.2
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• pp.31-41
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• 2019

Purpose - This paper examines the major antecedents of customer loyalty for mobile operators in a developing country in Africa especially in Nigeria. This study tests 5 hypotheses about the relationships among service quality, customer satisfaction, trust, and customer loyalty. Research design and methodology - In order to collect the sample data, online survey was conducted via email and social media network. The samples were collected from 415 random respondents. The statistical analyses were done for both assessing the reliability and the validity and testing 5 hypotheses of this study. SPSS version 21 was used for empirical analysis. Results - Service quality has a significant effect on customer satisfaction and service quality has a significant effect on trust also. Customer satisfaction has a significant effect on trust and customer satisfaction has a significant effect on customer loyalty also. Trust has a significant effect on customer loyalty. All of 5 hypotheses were supported. Conclusions - The results of the study show that it is important for marketing managers to manage service quality, customer satisfaction, and trust for improving customer loyalty in mobile service industry. This study also provides some implications for mobile service managers about the importance of customer retention and customer loyalty.

• Journal of Agricultural Extension & Community Development
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• v.27 no.2
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• pp.65-74
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• 2020

The study aims to identify the factors affecting business performance of rural tourism operators. For this study, 1,004 questionnaires were collected by field survey of rural tourism operators. The linear multiple regression analysis were used to identify factors affecting performance of rural tourism business. The result indicate that the factors influencing the sales of rural tourism business were in order of owning sales facilities, perception of multi-functional value of agriculture and rural, group promotion, number of rooms, and gender. In the case of gender, it was found that females had a high probability of positively affecting sales. The factors influencing the satisfaction of the rural tourism business were in the order of management strategy, number of days of operation, perception of multi-functional value of agriculture and rural, and business career. In the case of management strategy, it was found that the differentiation strategy have a positively affecting the satisfaction of the rural tourism business. As for the business career, the shorter the career, the higher the probability of positively affecting the satisfaction of the rural tourism business. The results of this study would be useful for establishing strategies to improve the management performance of the rural tourism business.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.263-264
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• 2018

The quality of service provided by Vessel Traffic Services depends on the tasks characteristics and the work environment of Vessel Traffic Service operators. In this paper, the working conditions of Vessel Traffic Service operators are analyzed in order to propose methods to improve the working environment of Vessel Traffic Services and to provide high quality service through them. The questionnaire survey was conducted for Vessel Traffic Service operators working at 20 Vessel Traffic Service centers. It is expected that it might be used as the basic data for improvement of work environment and organization of Vessel Traffic Service center in the future.

• Journal of the Korean Institute of Navigation
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• v.20 no.4
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• pp.7-44
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• 1996

The purpose of this study is to develop the training programme for VTS operators in Korea. The methodology used are literature and questionnaire survey. The literature, proceedings of international symposia and letters from Canada, USA, Japan and other countries were properly used and analyzed in order to compare their contents. Through the results of this study, I proposed the basic training programme for VTS operators in Korea as followings. First, the number and level of Korean VTS should be properly decided. Second, the training organization and staff should be built and appointed. Third, the VTS trainee should selected, and the training level & period should be established according to their qualification and experience. Fourth, the training should be acted by the VTS training curriculum. Fifth, The VTS operator certificate should be issued through proper test. This paper concluded as followings through the analysis of the questionnaire regarding to VTS training programme in Korea. First, the proposed curriculum were properly constructed and the independence among them was existed through the reliability and correlation analysis. Second, the difference of the curriculum importance among the questionnaire group was nearly not found through the Analysis of Variance(ANOVA). Third, the required days per each curriculum was limited to maximum 5days.

• Kyungpook Mathematical Journal
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• v.60 no.1
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• pp.73-116
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• 2020

The subject of fractional calculus (that is, the calculus of integrals and derivatives of any arbitrary real or complex order) has gained considerable popularity and importance during the past over four decades, due mainly to its demonstrated applications in numerous seemingly diverse and widespread fields of mathematical, physical, engineering and statistical sciences. Various operators of fractional-order derivatives as well as fractional-order integrals do indeed provide several potentially useful tools for solving differential and integral equations, and various other problems involving special functions of mathematical physics as well as their extensions and generalizations in one and more variables. The main object of this survey-cum-expository article is to present a brief elementary and introductory overview of the theory of the integral and derivative operators of fractional calculus and their applications especially in developing solutions of certain interesting families of ordinary and partial fractional "differintegral" equations. This general talk will be presented as simply as possible keeping the likelihood of non-specialist audience in mind.

• Journal of the Korea Safety Management & Science
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• v.24 no.1
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• pp.91-98
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• 2022

Since cranes are a kind of complex human-machine systems, it is almost impossible to completely secure safety with current technologies. Therefore, managerial interventions to prevent human errors are needed for safely operating a crane. The Occupational Safety and Health law states that cabin-type crane operators should have crane drivers' licence and crane-related operators (e.g., pendent-type crane operators, slinging workers) should take a special safety training. However, statistics on industrial accidents showed that fatalities due to crane accidents (185 accidents occurred during 2013~2017) were the highest among hazardous machinery and equipment. To effectively control the crane-related accidents, voices of crane workers need to be analyzed to investigate the current status. This study surveyed perceived causes of crane accidents and status of special safety training for crane workers of 387. The survey revealed that 24.3% of the respondents experienced crane accidents and 31.4% eye-witnessed crane accidents. 79% of the respondents pointed human errors such as improper crane operation and improper slinging as the first cause. Lastly, only 16.7% of the respondents took a professional special safety training; but the rest took lecture-based or incomplete education. The findings of the present study can be applied to improve crane-related policies and special safety training systems.

• Journal of Forest and Environmental Science
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• v.29 no.4
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• pp.307-313
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• 2013

Forest Survey consists of road survey, topographic survey, tree mapping survey, stream survey and also ridge survey. Information from forest survey is important and become essential in preparing base map to be used for forest harvesting planning and control. With the current technologies technique of data processing and mapping from traditionally hand drawn method had shifted to a computer system particularly the use of Computer Aided Design (CAD). This gives great advantages to the forest managers and logging operators. However data processing and mapping duration could be further reduced by integrating CAD with other established software such as Microsoft Excel. This time study to show that there is significance difference in term of duration for data processing and efficiency using AutoCAD in combination with Microsoft Excel program as compare to the use of AutoCAD program alone. From the study, it shows that the integration of AutoCAD and Microsoft Excel is able to reduce 70% of duration for data processing and mapping as compared to the use of AutoCAD program alone.

• Proceedings of the KSR Conference
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• 2005.05a
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• pp.97-102
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• 2005

As the railroad-base is an important factor to maintenance the rolling stocks, it is essential to improve the current problems of the environment pollution, nose, vibration, welfare, work condition and to applicate the performance betterment cases to the new base construction and pre-base maintenance. When the new base construction and pre-base maintenance is proceeded, it is necessary to construct the optimized system which includes the user's opinions enough to prevent the waste of the budget ,in that some part of the budget is spent to improve convenience, work condition, and the fault of base system after the construction. Therefore, this research intends to present the problem of the pre-constructed facilities, the testing operators' opinions, the analysis and the investigation of facilities' improvement, thorough the indication of provisions and the analysis of the result of the survey of testing operators.