• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.183-184
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• 2014

• Journal of Service Research and Studies
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• v.7 no.1
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• pp.15-26
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• 2017

The current research investigates the strategies for fostering service industries from the service's nature perspectives. Because the service industry is broad and heterogeneous in nature, if service's nature is not considered in building strategies for developing service industries, it would have a limited perspective, and thus, it would be difficult to foster large growth in service industries. In addition, not considering service's nature would not encourage synergy among service sectors nor encourage innovative development among individual sectors. Therefore, we need to understand that different service sectors are all under the umbrella for service industries, and consider the service's nature. The current research considers the service's relational, bidirectional, horizontality, and harmonization nature of services, and also, intangibility, inseparability, heterogeneity, perishability were considered in suggesting strategies for fostering service industries. These results can be used to developing governmental policies for developing service industries.

• The Journal of the Korea institute of electronic communication sciences
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• v.7 no.3
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• pp.491-497
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• 2012

Network coding is that the nodes can combine and mix the packets rather than merely forward them. Therefore, network coding is expected to improve throughput and channel efficiency in the wireless network. Relevant researches have been carried out to adapt network coding to wireless multi-hop network. In this paper, we designed the network coding for bidirectional traffic service in routing layer and IP layer of Ad-hoc network. From the simulation result, the traffic load and the end to end distance effect the performance of the network coding. As end to end distance and the traffic load become larger, the gain of network coding become more increased.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.14 no.6
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• pp.2686-2708
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• 2020

This paper investigates the energy efficiency of energy harvesting (EH) bidirectional cooperative sensor networks, in which the considered system model enables the uplink information transmission from the sensor (SN) to access point (AP) and the energy supply for the amplify-and-forward (AF) relay and SN using power-splitting (PS) or time-switching (TS) protocol. Considering the minimum EH activation constraint and quality of service (QoS) requirement, energy efficiency is maximized by jointly optimizing the resource division ratio and transmission power. To cope with the non-convexity of the optimizations, we propose the low complexity iterative algorithm based on fractional programming and alternative search method (FAS). The key idea of the proposed algorithm first transforms the objective function into the parameterized polynomial subtractive form. Then we decompose the optimization into two convex sub-problems, which can be solved by conventional convex programming. Simulation results validate that the proposed schemes have better output performance and the iterative algorithm has a fast convergence rate.

• Journal of Information Technology Applications and Management
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• v.31 no.3
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• pp.71-92
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• 2024

This study investigates the contribution of customer knowledge to customer intention to adopt mobile banking by evaluating the interaction among knowledge, perceived risk and trust, and behavioral intentions. Analysis is conducted through structural equation modelling using SPSS and AMOS and data from 783 customers representing the seven largest banks in Vietnam. Our study is the first one to find the existence of the bidirectional perspective between objective and subjective knowledge. The study further shows that the attenuation effect in the heuristic-systematic model could be used to explain the stronger influence of objective knowledge on intention compered to subjective knowledge. Our findings suggest that customer knowledge, perceived risk and trust impact the intention of mobile banking users in different manners and to different degrees. Particularly, objective customer knowledge is the most influential predictor of mobile banking adoption. Having a greater understanding of these relationships can help firms in deciding the kind of intervention that is most likely to convince customers to adopt a service.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.2B
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• pp.361-371
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• 2010

To vitalize the terrestrial DMB market, we introduce a personalized DMB(PDMB) service model based on metadata, especially DMB ECG XML standardized by TTA, under the convergence of broadcasting and telecommunications. Also we introduce the personalized DMB service system developed to validate the conformance of DMB ECG XML standard and the usefulness of DMB ECG service. The personalized DMB service system is described in details from the authoring stage to the consumption stage of the contents. The results of experimental tests for the personalized DMB service system are also introduced in this paper. We finally address the possibility of making successful personalized DMB services in mobile multimedia broadcasting market.

• Proceedings of the Korean Society of Computer Information Conference
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• 2024.01a
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• pp.355-358
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• 2024

본 논문에서는 기존 재난문자의 원리인 CBS(Cell Broadcast Service)의 한계를 극복하는 알고리즘을 제안한다. 재난 상황에서 CBS는 단방향으로 사람들에게 정보를 전달할 수 있으나 양방향 소통이 불가능하여, 어떤 사람이 어디에서 문제를 겪고 있는지를 파악할 수 없다. 재난 상황 시 효율적으로 정보를 관리하고, 요구조자에 대한 구조를 진행할 수 있다. 본 논문에서 제안하는 방법은 상황 설명과 위치 등을 생략하는 등 재난 피해 신고를 간편화하여 재난 상황으로 인한 피해를 추정하기 힘들다는 문제를 개선할 수 있다. 또한 이전에는 위치와 상황을 구체적으로 알려야 신고가 접수되었지만, 사용자가 위치와 상황을 구체적으로 알리지 않더라도 문자로 구조 요청이 가능해진다. 더 나아가, 재난 상황 시 음성을 추적할 수 있게 하여 직접 구조요청을 하지 못하는 상황에 대한 대처도 가능하다.

• Convergence Security Journal
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• v.21 no.3
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• pp.75-80
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• 2021

This study provided personnel and recruitment information related to job offer and job hunting, and proposed a non-face-to-face platform that can facilitate matching of one-time services as well as periodic services. The existing recruitment and job search method for personal assistant of the disabled is a one-way matching method in which a person in charge of the service providing centers assigns an activity assistant belonging to the institution when a consumer requests an personal assistant service, so the choice of job seekers is very weak. The job matching platform of the activity assistant for the disabled can be logged in separately by dividing users and separating them into the interface of the disabled or the disabled family members (job seekers) and activity assistants for the disabled (job seekers). Search for job offer and job seekers that meet their respective conditions, and real-time bidirectional decision-making through the chat function, and when the activity assistance service is completed, recruiters and job seekers can write service reviews and evaluations from their own point of view. The real-time interactive decision-making matching platform will also help minimize blind spots where it is difficult to provide services when short-term or one-time assistance is needed.

• Journal of Satellite, Information and Communications
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• v.8 no.4
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• pp.117-123
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• 2013

The development of the latest emotional recognition and multimedia technology has changed the traditional broadcasting system. The previous broadcasting system, which was operated by the terrestrial broadcasters, is now transformed to the viewer-centered and bidirectional broadcasting through the convergence of internet, mobile and smart TV. In this paper, smart-phone application for estimating human emotion(sadness, anger, depression) has been developed and emerged with smart TV, thereby we can present broadcasting service for enhancing the sense of common humanity among people of same group. If there is friend in the depression, we can bring comfort to him by inviting one for TV program what I watch and having a honest talk with facial avatar or emoticon. The proposed emotional broadcasting service inter-working with smart-phone application can give feeling of belonging and happiness to the people suffering from the blues, and it can prevent him from attempting suicide. In addition, smart-phone based emotional broadcasting service can be expended to program recommendation service customized to user's emotion, emotional LED lighting service to maximize the sense of reality and home shopping service taking advantage of the mood of customer.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.23 no.2
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• pp.157-168
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• 2013

The social network service is the bidirectional media that all of the users are be able to directly produce, process, and distribute the information without distinction of the producer and consumer. Over increasing the users rapidly, the users are be able to obtain and share the various information, but the problems occur due to the spread of unreliable information on the service. Moreover, it is spreading the problems violating the privacy and decreasing the reliability of the users by exploiting the open environment. Therefore, sensitive information can be delivered only to users which information producer can trust, and the users should get the information from the trustworthy users. Due to this necessity, it needs the efficient method can evaluates the reliability of the users. In this paper, we define the reliability in the service, make the trust parameter by using the function of the service, and propose the dynamic user reliability evaluation scheme evaluating the reliability of users. We draw the trust range on the reliability of users by analyzing the proposed reliability evaluation scheme.