• Journal of Information Technology Services
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• v.8 no.2
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• pp.229-245
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• 2009

The Korean mobile telecommunication service market is faced with a tremendous competitive period, in which the market is entering into the maturity stage with launching of the 3rd generation service and with introduction of mobile number portability. In general, it is more important to sustain the old customers than to attracting new customers, as the life cycle of an industry is entering the maturity stage in which the growth rate of new customers is decreasing gradually or becoming stagnant. Thus, mobile telecommunication business has to seek a way to maintain the existing customers instead of promoting new customers. So this study investigates whether the service quality of mobile telecommunication could have effects on the switching barrier of the industry. In order to test the hypothesis on the effects of service quality of mobile telecommunication in Korea on switching barrier, this study collected the questionnaire response data of students including middle and high school students and undergraduates, who are regarded as the major customers in that mobile telecommunication industry.

• Journal of Information Technology Services
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• v.17 no.2
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• pp.35-47
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• 2018

An electronic receipt (e-receipt) is a receipt issued electronically in place of a traditional paper receipt. This e-receipt, which can be accessed on a smartphone or online, allows for the exchange of goods, refunds, and other services without a paper receipt. The government is focusing on widespread dissemination of e-receipts to realize a society without paper by 2020. Introduction of the e-receipt has begun in mainly large marts and coffee shops, and recently, major franchise convenience stores. As a result, individual customer's transactions are being converted into electronic transactions, and the payment methods are changing to card-based electronic payment services or prepaid electronic payment services. The number of non-paper commercial transactions are also on the increase. In this paper, we try to identify the e-receipt industry ecosystem by analyzing the industries and markets participating in the process of receipt issuance from the perspectives of storage, management and disposal, and to analyze the domestic industrial and social economic effects expected from the spread of electronic receipts.

• YAKHAK HOEJI
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• v.54 no.4
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• pp.309-315
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• 2010

The Positive List System was newly introduced in South Korea as of January 2007. This study aims to survey and compare perception of and attitudes toward the Positive List System in the process of new drug listing that health professionals and pharmaceutical companies have. 50 professionals and 52 companies answered the questionnaire regarding health policy environments, policy decision/enforcement process, policy effects and satisfaction related to introducing the Positive List System. SAS 9.1 was used for statistical analyses. The results showed that participants had the general sympathy with health policy environments for the introduction of the Positive List System into South Korea. However, the response rates of policy decision/enforcement process and effects were negative and these tendencies were more striking in pharmaceutical companies. As for policy satisfaction, participants marked positive responses more than negative ones. It is necessary to remedy and supplement problems with policy decision/enforcement policy and effects revealed in this study and to improve the Positive List System through gathering opinions among groups and organization concerned.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.10 no.2
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• pp.55-65
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• 2011

The city of Suwon has introduced various ITS services between 2001 and 2006 as an alternative to solve chronic traffic congestion in the city. After the successful implementation, there was an effort to evaluate effects from the ITS deployments. However, the effects caused from ITS implementations may be realized in many different ways. Therefore, this research effort was aimed at evaluating the effectiveness of ITS implements through the first and second phases in Suwon using reasonable and scientific methods. Based on results from the analysis of variables presenting traffic condition, surveys and economic evaluation, the implementation of ITS services in Suwon can be concluded successful. However, there is a need for efforts to maintain the effects produced from the successful introduction of ITS services through continuous upgrading the systems, intensive maintenance, and efficient operations.

• Korean Journal of Childcare and Education
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• v.12 no.3
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• pp.99-119
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• 2016

The purpose of this study is to develop art activities using famous painting parodies in hopes of enhancing the creativity of 5-year old children. A total of 11 program activities were developed consisting of a preliminary activity (understanding the notion and ideas behind parody), introduction (view and analysis of famous paintings), development (theme selection, idea construction, and parody production), and conclusion (view and review of parody). Participants were 50 (24 in the experimental group and 26 in the comparative group) 5-year old children from a kindergarten located in G city. TTCT of Creative Thinking (TTCT: Figure A and B) was used as a research tool, and the listening abilities paintings test tool was applied to teachers of the groups. First, excluding accuracy, which is considered to be an unimportant factor in determining one's creativity, results showed positive effects on fluency, originality, abstractness, and persistence. Second, the program also showed positive effects on children's overall ability in appreciation of paintings as well as the sub factors including observation and expression, understanding painter's intention, atmosphere, materials and techniques, art elements, and attitude towards art piece.

• Journal of Ginseng Research
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• v.34 no.3
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• pp.160-167
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• 2010

Asian ginseng (Panax ginseng) and American ginseng (Panax quinquefolius L.) are the two most recognized ginseng botanicals. It is believed that the ginseng saponins called ginsenosides are the major active constituents in both ginsengs. Although American ginseng is not as extensively studied as Asian ginseng, it is one of the best selling herbs in the US, and has garnered increasing attention from scientists in recent years. In this article, after a brief introduction of the distribution and cultivation of American ginseng, we discuss chemical analysis of saponins from these two ginsengs, i.e., their similarities and differences. Subsequently, we review pharmacological effects of the saponins, including the effects on the cardiovascular system, immune system, and central nervous system as well as the anti-diabetes and anti-cancer effects. These investigations were mainly derived from American ginseng studies. We also discuss evidence suggesting that chemical modifications of ginseng saponins would be a valuable approach to develop novel compounds in drug discovery.

• Journal of Navigation and Port Research
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• v.31 no.10
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• pp.891-896
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• 2007

This paper is the empirical study results on the introduction effects of safety management system(SMS) for the shipping company. First of all, we take a brief look at the present Korean situations after the SMS induction Next, we analyse the effect of the SMS induction. We divided the effect of induction in 21 factors. The result was 3.5 out of 5 perfect points, which shows the high preference. Higher points were scored with international companies than domestic ones, the companies accepted before 1998 than the ones after 1998, and large enterprises than smaller ones.

• Steel and Composite Structures
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• v.32 no.6
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• pp.731-741
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• 2019

Shear deformation effects are neglected in most structural system identification methods. This assumption might lead to important errors in some structures like built up steel or composite deep beams. Recently, the observability techniques were presented as one of the first methods for the inverse analysis of structures including the shear effects. In this way, the mechanical properties of the structures could be obtained from the nodal movements measured on static tests. One of the main controversial features of this procedure is the fact that the measurement set must include rotations. This characteristic might be especially problematic in those structures where rotations cannot be measured. To solve this problem and to increase its applicability, this paper proposes an update of the observability method to enable the structural identification including shear effects by measuring only vertical deflections. This modification is based on the introduction of a numerical optimization method. With this aim, the inverse analysis of several examples of growing complexity are presented to illustrate the validity and potential of the updated method.

• Advances in nano research
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• v.12 no.3
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• pp.231-251
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• 2022

Dynamic behavior of temperature-dependent Reddy functionally graded (RFG) nanobeam subjected to thermomagnetic effects under the action of moving point load is carried out in the present work. Both symmetric and sigmoid functionally graded material distributions throughout the beam thickness are considered. To consider the significance of strain-stress gradient field, a material length scale parameter (LSP) is introduced while the significance of nonlocal elastic stress field is considered by introducing a nonlocal parameter (NP). In the framework of the nonlocal strain gradient theory (NSGT), the dynamic equations of motion are derived through Hamilton's principle. Navier approach is employed to solve the resulting equations of motion of the functionally graded (FG) nanoscale beam. The developed model is verified and compared with the available previous results and good agreement is observed. Effects of through-thickness variation of FG material distribution, beam aspect ratio, temperature variation, and magnetic field as well as the size-dependent parameters on the dynamic behavior are investigated. Introduction of the magnetic effect creates a hardening effect; therefore, higher values of natural frequencies are obtained while smaller values of the transverse deflections are produced. The obtained results can be useful as reference solutions for future dynamic and control analysis of FG nanobeams reinforced nanocomposites under thermomagnetic effects.

• The Bulletin of The Korean Astronomical Society
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• v.42 no.1
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• pp.46.2-46.2
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• 2017

Atmospheric propagation effects at millimeter wavelengths can significantly alter the phases of radio signals and reduce the coherence time, putting tight constraints on high frequency Very Long Baseline Interferometry (VLBI) observations. In previous works it has been shown that non-dispersive (e.g. tropospheric) effects can be calibrated with the frequency phase transfer (FPT) technique. The coherence time can thus be significantly extended. Ionospheric effects, which can still be significant, remain however uncalibrated after FPT, as well as the instrumental effects. In this work, we implement a further phase transfer between two FPT residuals (i.e. so-called FPT2) to calibrate the ionospheric effects based on their frequency dependence. We show that after FPT2, the coherence time at 3 mm can be further extended beyond 8 hours, and the residual phase errors can be sufficiently canceled by applying the calibration of another source, which can have a large angular separation from the target (> $20{\circ}$). Calibrations for all-sky distributed sources with a few calibrators are also possible after FPT2. One of the strengths and uniqueness of this calibration strategy is the suitability for high frequency all-sky survey observations including very weak sources. We discuss the introduction of a pulse calibration system in the future to calibrate the remaining instrumental effects and allowing the possibility of imaging the source structure at high frequencies with FPT2, where all phases are fully calibrated without involving any sources other than the target itself.