• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.383-386
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• 2007

Under the circumstance of Ubiquitous Society, service should be provided according to the users' location and environment. When specific service is demanded by user, the technology, which can help to detect whether there are devices performing the requested service in the ubiquitous network, is mandatory. This technology also should guarantee that users have the appropriate service through the most suitable device which is selected by this technology. The priority is an essential factor when multi service are asked by multi users simultaneouslyin the ubiquitous network, The paper focuses on realization of Smart Classroom which provides multi users, such as the professor and the students, with active services based on the Zigbee network and the Mobile platform.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.4B
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• pp.424-434
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• 2004

Ubiquitous network consists of various devices using several heterogeneous protocols and requires seamless communication between devices. This paper proposes a new hierarchical event service and multiple event server architecture to implement the service under ubiquitous environment. The proposed event service classifies devices by logical and physical location to abstract the idiosyncrasy of used protocols, and reduces network load. Due to the design consideration, the proposed architecture removes transfer of duplicated event data effectively. As a result, we can guarantee the reliable event delivery. The prototype multiple event server architecture was implemented according to the proposed idea and evaluated its performance under a home network test bed.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.6 no.3
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• pp.886-905
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• 2012

Set-top Box (STB) has evolved from being a device just sitting on top of a TV shelf to a device providing a gateway to the Internet for a home network, receiving services from multiple content providers, and enabling and ensuring Quality of Service (QoS) for the streaming media. IP Multimedia Subsystem (IMS), with its promise to provide a converged access network for multimedia service delivery (such as Triple play & Quadruple play services), has to guarantee QoS support. To enable QoS in IMS-based networks, we have designed a set-top box which provides feedback to the service provider to ensure end-to-end QoS. Our set-top box is designed to provide virtual platforms such that it can support multiple service providers. Each service provider is able to manage its own multimedia streams and ensures the desired network performance for each flow. The set-top box also works as a Home Gateway and provides end-to-end QoS support to the client nodes.

• Journal of the Korea Safety Management & Science
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• v.19 no.3
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• pp.137-150
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• 2017

Logistic enterprises want to be competitive enterprises in fierce logistic market and worry about the securement of discriminative competitiveness for it. The standards for the judgement of logistic industry's maintenance of competitiveness are not only economic feasibility of logistic costs but also the satisfaction of users because well-established service system for variety and enhancement of logistic needs. Some of the quality attributes sufficiently satisfy expectation of customers, but not guarantee high-quality satisfaction. Therefore, it's difficult to grasp quality attributes with the existing approach of perceived service quality. Quality attribute model suggested by Kano is widely used as the concept is accurate, there is high possibility to be used at the stage of product/service planning, and it can be easily applied. Kano model has a limitation that quality attributes are classified with mode and the differences between strong property of the quality attribute and week property in quality attributes were ignored. Therefore, Timko calculated customer satisfaction coefficient with the result of Kano's survey and effects of customer satisfaction and unsatisfaction through relations between satisfaction coefficient and unsatisfaction coefficient. The purposes of this study are to use ASC, the average of satisfaction coefficient and unsatisfaction, as the satisfaction of quality characteristics, decide the importance of quality characteristics with TOPSIS, a representative multi-standard decision-making method, and calculate strategy improvement propriety of logistic service quality.

• KIPS Transactions on Software and Data Engineering
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• v.9 no.11
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• pp.332-338
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• 2020

The blockchain contains potential to contribute for the development of education, teaching and learning as it provides the basic technologies which can handle the data transparently and stably in reliability. Especially, blockchain technology can guarantee the transparency, stability and reliability on the data especially in managing longitudinal education data. This study designed the Badgechain service platform combining badges and blockchains. This service consists of Badgechain solution, Moodle LMS linked to Badgechain added with Badgechain service as a learning activity, and Badgechain Wallet site where badges issued by various agencies can be viewed and managed. This study was performed as a basic study on educational use of blockchain.

• The Korean Journal of Health Service Management
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• v.12 no.3
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• pp.1-11
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• 2018

Objectives: The purpose of this study is to evaluate patient experience assessment of inpatients, and to prepare measures to improve the quality level of medical services and guarante patient rights. Methods: The study was conducted among 199 patients admitted to hospitals and general hospitals in the metropolitan area. The analysis method used was crossover analysis, including a comparison of means, and logistic regression analysis. Results: The overall average score of satisfaction with healthcare service was 3.39 for nurses, 3.35 for hospitals and 3.42 for general hospitals. Age at the time of hospitalization affected satisfaction. The overall average score of healthcare service satisfaction was 3.09 for doctors, 3.14 for hospitals, and 3.04 for general hospitals. The factors affecting hospital satisfaction were gender and subjective health status. The factors affecting satisfaction in general hospitals were education, medical department, and hospitalization route. Conclusions: Hospitals should also introduce a systematic management system of general hospitals and strengthen the guarantee of the rights of patients who can improve the quality of medical care through positive communication between medical personnel and patients.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.5
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• pp.714-724
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• 2022

The spread of mobile devices comes to increase explosive data traffic and then results in various types of service demands. In order to satisfy the increment of traffic and the requirements for various services, optical internet technologies that transmit several Tbps through only a single optical fiber have been actively studied. Because of the large bandwidth, an optical link can accommodate a large number of service types. Therefore, new technologies are required to guarantee the survivability of optical internet and handle the requirements of each service. So, in this article, a new scheme based on GMPLS technologies is proposed to deal with the various service demands and survivability issues in IP over WDM networks.

• Information Systems Review
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• v.13 no.1
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• pp.13-32
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• 2011

As the ubiquitous technology has been widespread, the u-service development in the private sector is increasing these days. Especially, consisting of various life spaces, a mixed-use complex started actively utilizing the ubiquitous technology in order to provide users with differentiated services. In this paper, a new development methodology of the u-service for a mixed-use complex is proposed. Because the ultimate purpose of the u-service in a mixed-use complex is to guarantee profitability, the u-service must accelerate commercial activities among various users in the complex. The u-service development methodology of a mixed-use complex proposed in this paper firstly defines various perspectives for the u-service and identifies specific u-service elements in cross points of the perspectives. Then with those u-service elements, the methodology generates a u-service pool. Finally, after evaluation process, target u-serviced to develop are selected. Having designed the u-service development methodology, we expect the methodology to contribute the successful implementation of u-service model for a mixed-use complex.

• The KIPS Transactions:PartA
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• v.10A no.6
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• pp.691-700
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• 2003

Due to the fast development of wire&wireless internet and computer hardware, more and more internet services are being developed, such as Internet broadcast, VoD (Video On Demand), etc. So QoS (Qualify of Service) is essentially needed to guarantee the quality of these services. Traditional Internet is Best-Effort service in which all packets are transported in FIFO (First In First Out) style. However, FIFO is not suitable to guarantee the quality of some services, so more research in QoS router and QoS protocol are needed. Researched QoS router and protocol are high cost and inefficient because the existing infra is not used. To solve this problem, a new QoS control method, named Network Adaptive QoS, is introduced and applied to client/server-based streaming systems. Based on network bandwidth monitoring mechanism, network adaptive QoS control method can be used in wire&wireless networks to support QoS in real-time streaming system. In order to reduce application cost, the existing streaming service is used in NAQoS. A new module is integrated into the existing server and client. So the router and network line are not changed. By simulation in heavy traffic network conditions, we proved that stream cannot be seamless without network adaptive QoS method.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.2B
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• pp.250-262
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• 2004

In IPv6 environment, the Internet Telephony, VoD(Video on Demand) and high capacity file exchange service will be more increased than IPv4. Therefore, the strict guarantee of QoS based on End-to-End and differentiated quality control schemes are simultaneously required. This paper proposes the flow control schemes on IPv6 network that the traffic is identified by flow and the QoS of multi-service is improved by QoS information in IPv6 hop-by-hop option header. The object of flow control includes not only non-default QoS traffic, which uses the flow label, but also best-effort or encrypted traffic. Therefore, the guarantee of real-time service is strengthened and the flow, which abuses unnecessarily the network resources, is effectively controlled. Also, this paper proposes the mapping scheme between the flow and MPLS by reflecting the minimum change of the existed network resource and the status of backbone network of ISP(Internet Service Provider). In the simulation result, It is shown that the proposed scheme is effective in the side of QoS on real-time services and utilization of backbone resources.