• Journal of Korean Society of Industrial and Systems Engineering
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• v.46 no.2
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• pp.109-115
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• 2023

This paper studied the problem of determining the optimal inventory level to meet the customer service target level in a situation where the customer demand for each branch of a nationwide retailer is uncertain. To this end, ISR (In-Stock Ratio) was defined as a key management indicator (KPI) that can be used from the perspective of a nationwide retailer such as Samsung, LG, or Apple that sells goods at branches nationwide. An optimization model was established to allow the retailer to minimize the total amount of inventory held at each branch while meeting the customer service target level defined as the average ISR. This paper proves that there is always an optimal solution in the model and expresses the optimal solution in a generalized form using the Karush-Kuhn-Tucker condition regardless of the shape of the probability distribution of customer demand. In addition, this paper studied the case where customer demand follows a specific probability distribution such as a normal distribution, and an expression representing the optimal inventory level for this case was derived.

• Journal of Korea Port Economic Association
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• v.18 no.1
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• pp.85-106
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• 2002

Across many industries, benchmarking is considered useful method to improve their service quality and achieve competitive advantage. Benchmarking, especially, has emerged as an increasingly important approach to improving the performance of logistics system and enables successful logistics services and doing good business in logistics services. There are no, however, literature approach for the relationship between benchmarking and port. It is the highest worth researching the application of benchmarking method on the port, since port is the most important component in supply Chain. Therefore, this paper tries to demonstrate the application of the benchmarking method on the port. To do this study, the literature approach developed by several researchers for logistics benchmarking is used as the basic framework. In addition, the following studies are executed: First, the survey of previous studies on logistics benchmarking. Second, finding the indicator and selecting the target in the port benchmarking. Third, the systematic execution schemes of the port benchmarking. Finally, based on the above studies, this paper provides a background for discussions on the future prospects for the application of the benchmarking method on the port.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.20 no.9
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• pp.954-960
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• 2009

In this paper, Indoor Positioning System based on Wi-Fi system which is one of the key technology in LBS(Location Based Service) is proposed. The proposed system estimates distance between MS(Mobile Station) and AP(Access Point) using RSSI(Received Signal Strength Indicator). RSSI is affected by outlier that originate from indoor environment complexity and obstacle. In this paper, we introduce a Robust outlier Extended Kalman Filter that can ignore, real-time outlier in the observations. To demonstrate performance of proposed indoor positioning system, we used a PDA as the MS.

• Journal of Information Management
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• v.41 no.3
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• pp.45-66
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• 2010

The purpose of this study is to develop service quality measurement model(DL-SQI model) which are able to measure objectively service quality of digital libraries in Korea and to measure user perceived service quality performance with DL-SQI model. This study also investigates the influence of service quality on customer satisfaction and customer loyalty. Before measurement, two principal rules and indicator formula were made to measure the service quality. Finally service quality of three digital libraries selected as samples was measured and analyzed in various points of view. It was developed a DL-SQI Consequences Model and testified it through path analysis using structural equation model.

• Journal of Information Technology Services
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• v.22 no.6
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• pp.37-53
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• 2023

With the development of the 4th industrial revolution, companies are trying to introduce new AI technologies and improve their performance. In particular, chatbot technology has developed and can not only communicate smoothly with humans, but also perform many complex tasks, so it has high market potential. However, there is still little research on chatbots in the field of e-commerce. Accordingly, this study aims to suggest ways to improve corporate performance through chatbot user satisfaction analysis. With the rapid development of China's e-commerce platform, In this study, through previous studies, the characteristics of chatbots were classified into accessibility, accuracy, empathy, reliability, and intimacy as factors influencing perceived usefulness, perceived ease, and perceived enjoyment of the Technology Acceptance Model (TAM). Five were selected and used as independent variables, and a model that affects customer satisfaction was set up. This paper sets user satisfaction as an important indicator of chatbot service and analyzes the path that affects user satisfaction, thereby improving chatbot service technology. It is important in that it provides a way to improve the smart chatbot service by understanding the degree of user acceptance in depth.

• The Journal of Information Systems
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• v.17 no.4
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• pp.79-98
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• 2008

FTTH(Fiber to The Home), a next generation communication service, is expected to boost up the growth of the whole IT industry and to creating new businesses by enabling the convergence of the broadcasting and communication technologies. It will consequently contribute to improve the quality of our life. The purpose of this study is to evaluate the performance of EPFSD using the Balanced Scorecard(BSC) model with five perspectives which are known to have inherent relationship: regional economy, regional customer, regional process, innovation and growth in the region, and regional infrastructure. 16 critical success factors(CSFs) and 37 key performance indicators(KPIs) are developed based on the BSC model to measure the performance indicators of the EPFSD.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.41 no.11
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• pp.1481-1489
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• 2016

A art from the typical data services based on 1:1 data communications, various new services based on 1:N communications have recently appeared. These services are becoming to require advanced 1:N communication schemes which can transfer the same data to many receivers efficiently and in high-performance. Especially, a Push-To-Talk (PTT) service, which is an important service in public safety communication system, requires a service server to disseminate the same voice media data to multiple receivers in a group in real-time and low latency. In this paper, we propose an efficient scheme to disseminate the same data to multiple receivers in low latency. In addition, we provide an analysis which gives a guide the performance of the 1:N communications in practical wired/wireless system environments in the perspective of the PTT service index.

• Journal of Korean Clinical Nursing Research
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• v.16 no.1
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• pp.131-143
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• 2010

Purpose: The purpose of this survey was to identify a set of performance indicators for Korean APNs (Advanced Practice Nurses). Methods: A convenience sample of 78 APNs working in 2 leading hospitals in south Korea participated in the three-round Delphi survey. In the first round, subjects were asked to propose performance indicators to evaluate the effectiveness of their practice. They rated the relevancy of each indicator during the second round. In the final round of survey, subjects rated the relevancy of indicators again in the light of second round's overall results and they also were asked to check on current and future use of indicators. Results: After 5 months of three-round Delphi survey, 60 performance indicators were identified. In regard to relevancy, the 10 highly ranked indicators were patient satisfaction, self-care ability, expertise of service, family satisfaction, nurse satisfaction, satisfaction in nursing education, advanced nursing service count, education for patient/ family, education for nurse, and compliance. Advanced nursing service count, education for patient/ family, and education for nurse are currently used as indicators by more than 70% of respondents. Conclusion: Additional research is needed to identify subsets of performance indicators for specialized areas and to determine the validity and sensitivity of indicators.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2008.10b
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• pp.684-690
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• 2008

FTTH(Fiber to The Home), a next generation communication service, is expected to boost up the growth of the whole IT industry and to creating new businesses by enabling the convergence of the broadcasting and communication technologies. It will consequently contribute to improve the quality of our life. The purpose of this study is to evaluate the performance of EPFSD using the Balanced Scorecard(BSC) model with five perspectives which are known to have inherent relationship: regional economy, regional customer, regional process, innovation and growth in the region, and regional infrastructure. 16 critical success factors(CSFs) and 37 key performance indicators(KPIs) are developed based on the BSC model to measure the performance indicators of the EPFSD.

• Journal of the Korean Society for Railway
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• v.15 no.3
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• pp.278-285
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• 2012

The Service Availability (SA) in the viewpoint of passenger is used as the key performance indicator (KPI) of quality of service in Light Rail Transit (LRT) Public-Private Partnerships projects. But there are many disputes on the target value of SA because of the lack of experience in SA. The target value of SA should be set at an early stage of the project to be specified on the system specifications and operation plan. Therefore, this paper developed the quantitative prediction model of SA to set the reasonably achievable target value of SA at an early stage of the LRT project. Also this paper analyzed the relationship and differentiation of SA and Train Punctuality (TP) that is mostly compared with SA.