• Communications for Statistical Applications and Methods
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• v.18 no.6
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• pp.687-696
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• 2011

Customer Lifetime or Customer Lifetime Value is a essential metric of differentiated CRM marketing and differentiated marketing strategy as a company core competency. However, customer lifetime used in companies is easily obtained from a confined simple customer attrition rate at some specific time point regardless of customer characteristics. In this study, in order to overcome the constraints of previous simple methods and to make practical use of it in industries, we suggest a method that estimates a customer lifetime using a customer segment based survival analysis with the censored data of customers; in addition, we apply this method to A mobile telecom company data. A method using customer segment based survival analysis is suggested in this study 1) includes all customers having different subscription dates, 2) reduces individual error, 3) can reflect trends after the observed time point and is more realistic.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2011.04a
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• pp.808-813
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• 2011

There are hundreds of thousands call center workers wearing acoustic device. However, researches and noise exposure measurements on the noise transmitted from acoustic devices have seldom been performed due to the difficulty of measurement and to the absence of the measuring method in Korea. The aim of this study is to set up management measures to protect hearing loss on the call operator by acquiring measurement data of noise transmitted from the headset Noise exposure measurements of 17 operators were performed in 7 call centers and Head and Torso Simulator method in compliance with the ISO Standard 11904-2 was used for the measurement of noise transmitted from the headset Sound pressure levels(SPL) transmitted from the headset were 73.2~86 dB(A). The operator exposed to the highest SPL set up his volume control at 9 which was the highest volume level. The volume control level, adjustable from 1 to 9, could be identified 12 out of 17 operators and the range of volume levels was 4.5~9. As a result of Pearson Correlation Analysis, the correlation between volume level and SPL transmitted from the headset showed high relation as significance at the 0.672 level(p<0.05). To protect hearing loss of call center operators, it is more practical and effective measure to limit the volume level below the noise exposure level, i.e. 85 dB(A), rather than to carry out noise monitoring considering cost-effective aspect.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.11C
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• pp.1081-1089
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• 2002

In these days many Organizations recognize risk of information asset by rapid change of information system environments, and need suitable management for that. Also many organization which operate important information-communication infrastructure take interest in threat, vulnerability and risk analysis of important asset by enforcement of Act on protection of information and communication infrastructure. But, it is most that methodology and tools that analyze risk for organization's information asset are developed in abroad up to now, domestic research of this field is insufficient stage. An research of this field is necessary in domestic because it can't reflect domestic actuality by depending on most foreign methodology or a tool. In this paper we proposed design and implementation for the risk analysis methodology, a prototype and important modules that considers the user convenience. We expect that the result of this paper will for step improvement of domestic risk analysis methodology and tool development.

• Journal of Korean Society on Water Environment
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• v.28 no.6
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• pp.804-812
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• 2012

This study contemplated domestic and other country's effluent limitation standards and suggested a methodology to establish technology-base limitation value. Current effluent limitation regulates industrial point sources discriminated by discharge flow rate and by regional distinction in Korea. Discharged $BOD_5$ load from large-scale plants(flow rate above $2,000\;m^3/day)$ exceeds 50% of overall industrial wastewater, which present rationale for discrimination based on plant size. However, regional distinction and pollutant- specific regulation might be insufficient to meet practical effectiveness of wastewater management policy, due to the nearly same limitation. Water quality data and treatment methods were investigated in hospital industry. And their distribution of effluent $BOD_5$ concentrations was statistically analyzed to suggest limitation value. Effluent $BOD_5$ concentrations showed lognormal distribution and $95^{th}$ percentile was corresponded to 87.9 mg/L, which could be suggested as tentative effluent limitation in hospital industry. The $95^{th}$ percentile of log-transformed distribution showed similar value of 86.5 mg/L. This study demonstrated reasonable methodology for establishing effluent limitation reflecting wastewater characteristic and treatment technology in separately categorized industry.

• Journal of Fashion Business
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• v.16 no.4
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• pp.166-185
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• 2012

This study aims to examine the effects of talent types and appearance affect perception on the clothing consumption values in 367 adults(female and male). The present study is the first to consider both talent types and the appearance affect perception on the clothing consumption values correlates to appearance management behaviour. As a results, the talent type of 367 respondents was mean=3.324. The highest talent of 367 respondents was interpersonal talent, the lowest talent was logical-mathematical talent among 8 talent types. The effects of 8 talent types on 5 clothing consumption values were significant on the regression analysis, specifically the results showed that the effects of linguistic, musical, interpersonal and intrapersonal talents among 8 talent factors on the clothing consumption value were significant. Regression results showed that if the practical and the inner-directed appearance affect perception factors among 3 appearance affect perception factors increase by one standard deviation, the social, political, aesthetic, and emotional clothing consumption values increase by each standardized efficient ${\beta}$. The effects of 8 demographic factors on 5 clothing consumption values were significant on the regression analysis, specially, occupation, monthly clothing allowance, income, and sex variables were significant, the results revealed that if the occupation factor(specialist and administrator) increases by one standard deviation, the social, political, aesthetic, and emotional clothing consumption values increase by each standardized efficient ${\beta}$. Finally, this study suggests that the 3 independent variables(talent types, appearance affect perception factors, and demographic factors) were predictors related to clothing consumption values. The higher the score, it was concluded that the independent variables were more active in clothing consumption behaviour.

• Journal of Korea Society of Industrial Information Systems
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• v.18 no.6
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• pp.113-125
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• 2013

Outsourcing is used as one of the effective methods while many companies have to start to innovate everything because of increased fierce global competition, low-growth economy, and varied customers' requirements. Under these conditions, a lot of firms are introducing outsourcing for cost savings, risk reduction, management efficiency, strengthen core competence. The purpose of this study is to analyze the effect of between outsourcing success by outsourcing strategy and factors for selecting outsourcing partners and BSC success in the Korea manufacturing. This study was intended to make it possible to get a practical approach on evaluation and compensation of the outsourcing manufacturing enterprises by identifying outsourcing success factors and BSC performance factors. When an outsourcing partner of enterprise is selected, detailed assessment will be possible in terms of partner's competence, financial factors, institutional factors, and operational factors.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.18 no.1
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• pp.67-73
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• 2000

The water quality of inland stream is polluting with industrialization and urbanization, and with that water quality of lake also deteriorated, to manage water quality pollution problem of lake, new water quality management method is needed. As a pilot study of the method that manage water quality of lake using GSIS(Geo-Spatial Information System), we study the method which automatically extract the hydraulic characteristic informations of lake in GSIS environment. Also, as an example of practical use of the extracted hydraulic characteristic information of lake, we carry out the characteristic analysis of waterbody flow using finite different method. With the automation the extraction procedure of hydraulics characteristic information needed in characteristic analysis of waterbody flow, we carried out the analysis efficiently. Particularly, with the extraction of section information on lake not in layout form, in analyzable form, we make the analysis that section information of lake was indispenably required(e.g. stratification analysis) possible in GSIS environment.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.27 no.4
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• pp.485-493
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• 2009

The u-City offers diverse u-services, which are integrated with information and GIS technologies, by utilizing an integrated management platform for controlling the city efficiently, increasing convenience of city lift, and improving the quality of lives. An urban control system is a core element of the u-City to connect organically and expand all kinds of information through various u-interfaces. This study presents the implementation of a GIS service module based on the urban control system for the efficient development of u-services, which contributed to the successful execution of GIS service scenarios that include processes of unexpected events, air pollution monitoring, and emergences. The results of the study can be used as basic data for the design and operation of practical u-City services.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.6
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• pp.2688-2699
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• 2013

The purpose of this study is to present the components about well-being in-flight meal associated with increased customers' interest on health, to empirically analyze the impact on customer's satisfaction and to propose the methods to establish the strategy of in-flight meal of airlines in the future. The results are as follows: First, it was shown that the environment-oriented in-flight meal and sanitation services of flight crew among components of well-being in-flight meal significantly affected the customer's satisfaction. Second, it was shown that healthy in-flight meal and sanitation services of flightcrew significantly affected the customer's loyalty and satisfaction. This study has the practical significance, since it presents the compoents of well-being in-flight meal affecting customer's satisfaction and loyalty and proposes the measures.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2008.04a
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• pp.19-24
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• 2008

Recently, the buildings have gradually become higher, more massive and more complex with high growth of economy and varieties of the patterns of people's living. Therefore we study a performance and Improving Methods of the fire compartment as a measure to minimize the damage of the people and property from the fire. Currently, under the economic crisis situation, we do not consider about prevention of disaster safety enough; safety investment evasion, safety carelessness, and management relaxation etc. Also in the aspect of regulation system, industrial technology and plan engineering, Korean techniques of preventing fire disasters are far behind of other advanced nations. At this point, we are in need of improving about it. When considering like this situation, we need more studies on the practical improvement in order to assure fire prevention for buildings. The fire compartment prevent from magnifying the fire to the wide area by compartment into specific area. From this, it is possible to minimize fire damage and property and secure emergency exit for life safety. This fire compartment has primary function to extinguish fire easily, and the openings and penetrations are important passage which makes the smoke and fire go away from the fire area to the contiguous space. This study suggests improving methods of domestic fire compartment efficiency standard through comparative analysis of overseas advanced provision and domestic provision about base element of the building fire prevention.