• Journal of Communications and Networks
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• v.11 no.3
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• pp.306-317
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• 2009

We consider the problem of architecting a reliable content delivery system across an overlay network using TCP connections as the transport primitive. We first argue that natural designs based on store-and-forward principles that tightly couple TCP connections at intermediate end-systems impose fundamental performance limitations, such as dragging down all transfer rates in the system to the rate of the slowest receiver. In contrast, the ROMA architecture we propose incorporates the use of loosely coupled TCP connections together with fast forward error correction techniques to deliver a scalable solution that better accommodates a set of heterogeneous receivers. The methods we develop establish chains of TCP connections, whose expected performance we analyze through equation-based methods. We validate our analytical findings and evaluate the performance of our ROMA architecture using a prototype implementation via extensive Internet experimentation across the PlanetLab distributed testbed.

• The Korean Journal of Franchise Management
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• v.6 no.2
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• pp.67-85
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• 2015

This study attempts to measure the performance of franchise brands using the Enterprise Contract Management(ECM) and Franchise Contract Management Leverage(FCML). The data were collected from 14 chicken franchise brands and 16 coffee franchise brands. This research suggests some implications as follows. Chicken franchise brands are confronted with the slow growth, but coffee franchise brands still have the potential growth. According to FCML, as well, it shows that chicken franchise brands should focus on qualitative performance through franchise store management to achieve sustainability, and coffee franchise brands need the managerial strategies to maximize franchisees' sales profit, which leads increasing franchisor's business performance ultimately.

• Proceedings of the Society of Korea Industrial and System Engineering Conference
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• 2002.05a
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• pp.125-132
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• 2002

We study clustering algorithm for sequences of categorical values. Clustering is a data mining problem that has received significant attention by the database community. Traditional clustering algorlthms deal with numerical or categorical data points. However, there exist many important databases that store categorical data sequences. In this paper we introduce new similarity measure and develope a hierarchical clustering algorithm. An experimental section shows performance of the proposed approach.

• Journal of Biomedical Engineering Research
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• v.9 no.2
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• pp.179-184
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• 1988

In this study, we improve the performance of telemetry ECG modem using acoustic coupler. The results are as follows : (1) General active filter is replaced by SCF(switched capaciror filter) improving the LPF and BPF characteristics. (2) ECG Pre-amplifier is installed in ECG modem. (3) The interface circuit is designed to store the ECG waveform in casette recorder.

• Journal of Distribution Research
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• v.3 no.1
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• pp.31-54
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• 1998

The purpose of this research is three-fold; 1, establish the causal model of market-orientation, customer satisfaction, employee satisfaction and firm's perfor-mance. 2. testify the hypothesis derived by the model on a service industry of fastfood franchise. 3. develop the diagnostic tool for managing the service firm from the perspective of CS. The results show us; 1. customer satisfaction increases the performance of franchise store. 2. employee satisfaction does not necessarily increases customer satisfaction in a short-run, however the long-run impact of employee satisfaction on customer satisfaction is conjectured to be increased. 3. Satisfaction Portfolio Analysis can be utilized as management tool to improve the customer satisfaction and employee satisfaction for service industry.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.18 no.34
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• pp.129-137
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• 1995

Recently the recognition of Logistics becomes important to enterprises as a means for improving their competition, but the Korea enterpries falls for far behind in management techniques for analyzing realities and problems in the logistic compare to the advanced countries. In describing a distribution network, we have stated that it is basically a system or a set of locations that ship, receive or store material plus the routes that connect these locations. Using a Dynamic Programming on logistics, we can decrease the inventory level and increase the service level on logistics and the management performance.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.26 no.1
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• pp.17-21
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• 2003

We study clustering algorithm for sequences of categorical values. Clustering is a data mining problem that has received significant attention by the database community. Traditional clustering algorithms deal with numerical or categorical data points. However, there exist many important databases that store categorical data sequences. In this paper, we introduce new similarity measure and develop a hierarchical clustering algorithm. An experimental section shows performance of the proposed approach.

• Journal of Industrial Technology
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• v.9
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• pp.101-107
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• 1989

The magnetic forming system must be able to store very important electric energy, several tens kilojoules, and flow this energy through the forming coil within some hundreds microseconds. So several hundreds kiloamperes of current can flow through the branch conductor. For the good performance of this type of machine, internal impedance must be minimized. By the computation of distribution of current inside the conductors using integral equation method, we can obtain the inductance and resistance of some dispositions of branch conductors and by comparison obtain some principles for the design of branch conductors in the high power magnetic pulse generator.

• Journal of Fashion Business
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• v.11 no.2
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• pp.1-13
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• 2007

The purpose of this study is to confirm Customer Voluntary Performance as a new strategy that contributes to Service Quality and maintains customer Relationship, and to understand how Service Quality and Relationship Benefits on Customer Voluntary Performance. To pursue the above purposes, the experimental model showing the working process was designed like this: Service quality - Relationship Benefits - Customer Satisfaction - Relationship Quality - Customer Voluntary Performance. To accomplish the experimental study, questionnaire method was chosen and targeted women living seoul. 721 questionnaires were used in last analysis. SPSS 8.0 was used in analysis of data. The results show that (1)Customer satisfaction was affected by Service Quality and Relationship Benefits affirmatively; (2)Relationship Quality was affected by Customer Satisfaction, Service Quality, Relationship Benefit; (3)Customer Voluntary Performance was affected by Relationship Quality and Customer Satisfaction; (4)Service Quality and Relationship Benefits influenced on Customer Voluntary Performance. This study has a important meaning that it provides marketing strategy on satisfied relationship maintenance and customer satisfaction creation.

• Journal of the East Asian Society of Dietary Life
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• v.24 no.5
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• pp.680-690
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• 2014

This study investigated the performance of hygiene management according to the capacity and food cost of foodservice in kindergartens as a measure of kindergartens foodservice hygiene management. Dietitians from the education office visited 50 kindergartens under the control of Dongbu District Office of Education during January, 2011. Kindergartens were 11 public and 39 private institutions. Over half of kindergartens (n=27) provided foodservice to 50~99 children. About 21 kindergartens had a foodservice cost per student per day of 2,000 won. Regarding personal hygiene, 'whether to wear an accessory or have a manicure' showed the best performance. 'Whether to have their health examined once every 6 months or keep their health records in 2 years' was rarely performed. For food materials, 'whether to buy food appropriate for the quality control standard of food materials' showed the highest performance. The highest performances for storage management of food materials and handling of food was 'whether to store goods within butlery at intervals more than 30 cm from the ground' and 'whether to heat and cook food more than $74^{\circ}C$', respectively. The highest performance for distribution of food and management of facilities was 'the hygienic management of cooking tools and facilities' and 'the proper installation of air-conditioning, heating and ventilation facilities', respectively. The results of this study show that capacity and food cost had the strongest effects on performance of personal hygiene. Especially, smaller facility size could increase performance of foodservice management.