• Journal of the Korea Society of Computer and Information
• /
• v.13 no.1
• /
• pp.45-54
• /
• 2008

As mobile Web technology becomes more increasingly applicable. the mobile contents market. especially the music downloading for mobile phones, has recorded remarkable growth. In spite of this rapid growth, customers experience high levels of frustration in the process of searching for desired music contents. It affects to a re-purchasing rate of customers and also. music mubile content providers experience a decrease in the benefit. Therefore, in aspects of a customer relationship management (CRM), a new way to increase a benefit by providing a convenient shopping environment to mobile customers is necessary. As an solution for this situation, we propose a new music recommender system to enhance the customers' search efficiency by combining collaborative filtering with mobile web mining and ordinal scale based customer preferences. Some experiments are also performed to verify that our proposed system is more effective than the current recommender systems in the mobile Web.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.28 no.1
• /
• pp.36-44
• /
• 2014

The conventional central photo voltaic inverters have several problems. First, shadow problem in each solar panel, and high DC voltage problem from each panel because of concentration to one central inverter. Therefore, module integrated inverter is proposed to solve these problems. The inverter should be small and cost effective. The cost and size in the inverter depend on the inductor. So the switching frequency should be increased to reduce the inductor and total size, but there is a problem in efficiency because of the losses in turn-on and turn-off. In the paper, the critical conduction mode(CRM) switching method is adopted to reduce the switching loss and interleaving method is proposed to increase the efficiency in Flyback converter. Finally, the validity of the proposed scheme is investigated with simulated and experimental results for a prototype system rated at 200W.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2010.02a
• /
• pp.347-347
• /
• 2010

We designed a new experimental set-up for measuring activity of heterogeneously catalyzed reactions. Using this set-up, we studied reduction of carbon dioxide by carbon dioxide reforming of methane (CRM) using nickel powder as catalyst. The properties of the catalysts were characterized by X-ray diffraction (XRD), Brunauer, Emmett & Teller (BET) surface area and X-ray photoelectron spectroscopy (XPS) techniques. The reactivity experiments were performed in the temperature range of $300\;-\;500^{\circ}C$. At reactivity experiment, result showed consumption of $CO_2$ and $CH_4$ with a 1:1 stoichiometry. At the same time, carbon monoxide and hydrogen were produced, which could be used for synthesizing fuels such as methanol. During the reaction, deposition of carbon on Ni was observed, which caused deactivation of the catalyst.

• Food Science of Animal Resources
• /
• v.28 no.3
• /
• pp.301-305
• /
• 2008

This study was carried out to develop an accurate and rapid analysis method to measure the contents of iodide and chloride in infant formula using an ion selectivity electrode. The infant formula SRM 1846 (Standard Reference Material 1846, NIST, USA) was used as a CRM (Certified reference material). Samples were dissolved in water with 3% acetic acid and filtered through filter paper and adjusted to pH 7.0 with 0.1N NaOH. At pH 7.0, the iodide content of the CRM was $1.04{\pm}0.03\;mg/kg$ compared to the specification of $1.11{\pm}0.1\;mg/kg$ of CRM, and the recovery was $93.7{\pm}2.7%$. The chloride content was $5114.3{\pm}240\;mg/kg$ compared to the specification of $4,920{\pm}300mg/kg$ of CRM, and the recovery was $103.9{\pm}4.9%$. Ion selectivity electrodes could be successful1y used to determine the concentration of iodide and chloride ions in infant formula by a simple and rapid pretreatment of sample matrixes.

• Analytical Science and Technology
• /
• v.18 no.6
• /
• pp.552-558
• /
• 2005

A type of dimethyl sulfide gas CRM in the ppb level was developed for the analysis of trace-level odorous gas in environmental atmosphere. The concentration of dimethyl sulfide ($(CH_3)_2S$) was 10 umol/mol level in the cylinder filled with nitrogen, 1500 psi. And the variability of the concentration for 3 years was about 0.1% due to the adsorption or instability of $(CH_3)_2S$. The gas standards produced simultaneously in 4 bottles and examined by GC-FID were shown with 0.4%, reproducibility of preparation and 0.25%, standard uncertainty due to weighing and purity. The relative expended uncertainty of 1.1% (95% of confidence level, k=2) was assigned to the certified value of 10 umol/mol level of $(CH_3)_2S$ after quantitative evaluation on the purity, mixing, weighing, analysis, adsorption and stability of dimethyl sulfide gas.

• Health Policy and Management
• /
• v.16 no.1
• /
• pp.54-72
• /
• 2006

This study was conducted as the primary work to develop a customer relationship management (CRM) system to improve the performance of health screening programs. The specific aims of the study was to identify and classify the characteristics of the people who did not receive their health screening using decision trees and to propose management strategies according to their characteristics identified. The data on a total of 5,102,761 subjects of health screening provided by the National Health Insurance Program in the year of 2002 were used. The target variable was whether they underwent their health screening. The input variables included a total of 27. The SAS 9.1 version was used for data preprocessing and statistical analyses. SAS Enterprise Miner was used to develop the decision trees model. The decision trees identified the factors greatly affecting the health screening. In the non-disease group, the highest rate of non-examinees was characterized by: no experience of receiving a health screen, household's age, non-insured episode for the last one year, and patients' age. In the disease group, the one showing the highest rate of non-examinees was characterized by: no experience of receiving a health screening, no experience of going to public health center or midwife clinic for the last one year, and examinees' age. Developing CRM systems for health screening management taking into account the individual characteristics would be considerably helpful to increase the rate of receiving health screening.

• Korean Management Science Review
• /
• v.22 no.1
• /
• pp.127-148
• /
• 2005

This study aims at identifying the motive and infra that can satisfy them and enable them to succeed by coming out of existing customers control method focused on data and acquiring and applying the knowledge customers have. It also aims at enabling corporations to carry out more developed customer relations. This study will prove that acquiring and applying customers' knowledge is effective and will come up with a stepping-stone to get rid of dangerous factors by having competitiveness in a competitive environment and extending and changing the corporation. For this, the study have identified knowledge-oriented infra that corporations know and customer relations by conducting a poll of local corporations and have presented motives that can effectively carry out knowledge-based customer relations.

• International Journal of Human Ecology
• /
• v.6 no.1
• /
• pp.41-59
• /
• 2005

In this paper, the e-grocery sector of the U.S. is used as an illustrative example of how to assess consumers' demands for customer relationship management and to investigate whether these demands coincide with effective Customer Relationship Management (CRM) strategies suggested by academic researchers and provided by practitioners. Surveys evaluating the perceived importance of CRM items were administered accordingly. The findings show that, overall, consumers' did not differ considerably to the experts. The results of descriptive analyses showed that academicians had a more closely in-lined view with consumers than did practitioners. Although not statistically significant, practitioners perceived loyalty programs to be more important than did consumers or academicians. This might suggest that loyalty programs are primarily serving as a way of data mining, and are thus failing to provide benefits to consumers. Overall, items related to technology deployment were perceived to be more important by practitioners than consumers or academicians.

• Journal of Internet Computing and Services
• /
• v.9 no.1
• /
• pp.69-78
• /
• 2008

Finance, Securities, banking system provides information through Internet, DM SMS, IVR, E-mail and FAX for customer. Customers can use multi channel. Enterprise requires Host transaction and transparency for DB processing, This paper provides two contributions to the study. First, we discuss Server of Fire insurance (finance, securities and capital, bank system) in Enterprise. Second, we present Real time monitoring system for customer transparency. Finally, we design and implement the proposed system. These techniques can be efficiently supported in CRM(Customer Relationship Management).

• Journal of Information Technology Applications and Management
• /
• v.10 no.1
• /
• pp.19-34
• /
• 2003

Identifying customer repurchase intention is very Important for the Internet shopping mall to activate CRM (customer relationship management) in B2C (Business to Customer) eCommerce. In this paper, the experienced buyer's repurchase intention Is analyzed by using the approach of customer segmentation. Total of 979 samples, which had already experience of Internet shopping, are analyzed to demonstrate that the degree of repurchase Intentions differs from each segmented group. The benefit segmentation is performed by identifying private benefits for which consumers can seek among 14 services. The results show that the different group has a significant difference in the repurchase Intention. The results of repurchase intention can lead to practical recommendations for CRM in B2C eCommerce.