• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2017.05a
• /
• pp.507-509
• /
• 2017

Medical tourism is a newly-prevailing industry accompanied by the change of lifestyle to a health-seeking life in the 21st century, which not only attracts foreigners using high-end medical technologies and equipments but also linking recuperation and leisure and cultural activities to the tour. many chinese tourists enter seeking both medical and tourism purposes. However, since the system for medical tourism is not well supported and there is no medical insurance for Chinese people, it is necessary to link safe hospitals and guides for these Chinese people and to develop systems that will provide proper information to Chinese people. This paper will introduce and propose a medical tour service system which effectively links hospitals, chinese tourists and brokers.

• Corrosion Science and Technology
• /
• v.10 no.2
• /
• pp.43-46
• /
• 2011

Zinc consumption in a continuous galvanizing line is one of the highest operating cost items in the facility and minimizing zinc waste is a key economic objective for any operation. One of the primary sources of excessive loss of zinc is through the formation of top dross and skimmings in the coating pot. It has been reported that the top skimmings, manually removed from the bath, typically consist of more than 80% metallic zinc with the remainder being entrained dross particles ($Fe_2Al_5$) along with some oxides. Depending on the drossing practices and bath management, the composition of the removed top skimmings may contain up to 2 wt% aluminum and 1 wt% iron. On-going research efforts have been aimed at in-house recovery of the metallic zinc from the discarded top skimmings prior to selling to zinc recycling brokers. However, attempting to recover the zinc entrapped in the skimmings is difficult due to the complex nature of the intermetallic dross particles and the quality and volume of the recycled zinc is highly susceptible to fluctuations in processing parameters. As such, an efficient method to extract metallic zinc from top skimmings has been optimized through the use of a specialized thermo-mechanical process enabling a continuous galvanizing facility to conserve zinc usage on-site. Also, through this work, it has been identified that filtration of discrete dross particles has been proven effective at maintaining the cleanliness of the zinc. Future efforts may progress towards expanded utilization of filters in continuous galvanizing.

• Journal of Korea Multimedia Society
• /
• v.24 no.8
• /
• pp.1101-1113
• /
• 2021

The rapid growth of sense-and-respond applications and the emerging cloud computing model present a new challenge: providing publish/subscribe middleware as a scalable and elastic cloud service. The publish/subscribe interaction model is a promising solution for scalable data dissemination over wide-area networks. In addition, there have been some work on the publish/subscribe messaging paradigm that guarantees reliability and availability in the face of node and link failures. These publish/subscribe systems are commonly used in information-centric networks and edge-fog-cloud infrastructures for IoT. The IoT has an edge-fog cloud infrastructure to efficiently process massive amounts of sensing data collected from the surrounding environment. In this paper. we propose a quorum-based hierarchical fault-tolerant publish/subscribe systems (QHFPS) to enable reliable delivery of messages in the presence of link and node failures. The QHFPS efficiently distributes IoT messages to the publish/subscribe brokers in fog overlay layers on the basis of proposing extended stepped grid (xS-grid) quorum for providing tolerance when faced with node failures and network partitions. We evaluate the performance of QHFPS in three aspects: number of transmitted Pub/Sub messages, average subscription delay, and subscritpion delivery rate with an analytical model.

• Annual Conference of KIPS
• /
• 2011.04a
• /
• pp.220-223
• /
• 2011

For successfully commercialized grid systems, it is required to provide an efficient scheduling scheme which is able to optimize benefits for three participants such as consumers, brokers, and providers so that every participant has sufficient benefit to maintain a sustainable market. In this paper, we define this job scheduling problem as an objective optimization problem for three participants. The three objectives are to maximize the success rate of job execution, total achieved profit, and the system utilization. To address the scheduling problem, we propose heuristics referred to as SLA-aware scheduling scheme (SA) for optimal resource allocation. The simulation results show that the improvement and the effectiveness of the proposed scheme and the proposed scheme can outperform well-known scheduling schemes such as first come first serve (FCFS), shortest job first (SJF), and earliest deadline first (EDF).

• International Journal of Computer Science & Network Security
• /
• v.23 no.5
• /
• pp.13-20
• /
• 2023

In connected vehicles, drivers are exposed to attacks when they communicate with unauthenticated peers. This occurs when a vehicle relies on outdated information resulting in interactions with vehicles that have expired or revoked certificates claiming to be legitimate nodes. Vehicles must frequently receive or query an updated revoked certificate list to avoid communicating with suspicious vehicles to protect themselves. In this paper, we propose a scheme that works on a highway divided into clusters and managed by roadside units (RSUs) to ensure authenticity and preserve hidden identities of vehicles. The proposed scheme includes four main components each of which plays a major role. In the top hierarchy, we have the authority that is responsible for issuing long-term certificates and managing and controlling all descending intermediate authorities, which cover specific regions (e.g., RSUs) and provide vehicles with short-term pseudonyms certificates to hide their identity and avoid traceability. Every certificate-related operation is recorded in a blockchain storage to ensure integrity and transparency. To regulate communication among nodes, security managers were introduced to enable authorization and access right during communications. Together, these components provide vehicles with an immediately revoked certificate list through RSUs, which are provided with publish/subscribe brokers that enable a controlled messaging infrastructure. We validate our work in a simulated smart highway environment comprising interconnected RSUs to demonstrate our technique's effectiveness.

• Annual Conference of KIPS
• /
• 2021.11a
• /
• pp.125-127
• /
• 2021

본 논문에서는 기존의 산업 및 서비스 변화에 따라 발생하는 빅데이터 분석 서비스 처리를 위한 빅데이터 분석 서비스 브로커 시스템을 제안한다. 기존의 빅데이터 분석 시스템은 분석하는 시간 동안 지속적으로 자원을 점유하고 있어야 하며, 이러한 서비스를 이용하기 위해 내부에 대규모의 시스템을 구축하고 지속적으로 운영해야하는 단점이 존재한다. 본 논문에서는 빅데이터 분석에 필요한 자원을 효과적으로 사용하기 위해 클라우드 기반의 자원 관리와 연계하고 서비스 이용을 용이하게 하기 위해 단일 엔드포인트 기반의 빅데이터 분석 서비스 호출 구조를 설계하였다. 이를 통해 빅데이터 서비스 분석에 소요되는 자원 점유에 따라 동적으로 자원을 생성 관리하여 자원을 보다 효과적으로 이용할 수 있는지 테스트베드를 구축하여 서비스 이용 및 자원 사용을 효과적으로 하는지 확인하였다. 또한, 이를 통해 대규모 자원을 지속적으로 점유해야하는 빅데이터 분석 플랫폼의 자원사용에 대한 한계를 일부 해소하여 자원을 효과적으로 이용할 수 있는 것을 확인하였다.

• Korean Business Review
• /
• v.17
• /
• pp.137-151
• /
• 2004

Wrap accounts are customized financial services for which investment companies and stock brokers manage investors assets based on their preferences. The success of wrap accounts depend upon the accurate understanding of investment risk propensity and the proper designing of financial portfolio. To this end investment companies should accurately measure investors investment risk propensity with calibrated measures. There, unfortunately, exist few highly calibrated measures of investment risk propensity. Therefore the practices of marketing strategies and customer management often turn out to be less effective and fragile to competition. The purposes of this present study aim to understand the investment risk propensity of wrap accounts customers, to help classify the customers based on the degree of the investment risk propensity, and to implement relevant marketing strategies for different groups of customers. Based on previous studies, two hypotheses were delineated and verified. The findings of the study should help differentiate prospective customers into unique and accessible segments for further targeting and positioning wrap account markets.

• KIISE Transactions on Computing Practices
• /
• v.20 no.12
• /
• pp.664-669
• /
• 2014

As the prevalence of cloud computing increases, various cloud service types have emerged, such as IaaS, PaaS, and SaaS. The growth and diversification of these cloud services has also resulted in the development of technology for cloud service brokers (CSBs), which serve as intermediate cloud services that can assist cloud tenants (users) in deploying services that fit their requirements. In order to broker cloud services, CSBs require the specification of structural models in order to facilitate the analysis and search for cloud services. In this study, we propose a variability-based service analysis model (SAM) that can be used to describe various cloud services. This model is based on the concept of variability in the software product line and represents the commonality and variability of cloud services by binding variants to each variation point that exists in the specification, quality, and pricing of the services. We also propose a virtual cloud bank architecture as a CSB that serves as an intermediate to provides tenants with appropriate cloud services based on the SAM.

• The Journal of the Korea Contents Association
• /
• v.17 no.12
• /
• pp.49-63
• /
• 2017

Interdisciplinary convergence research is widely seen as a collaborative research between different disciplines, which is often driven by common agenda or problems in pursuit of a particular common objective. Thus, the purpose of interdisciplinary cooperation in convergence research is to bring each discipline's unique perspective together with the academic expertise of researchers in order to share common problems that cannot be solved effectively without research partnership. We present empirical evidence on how interdisciplinary research relationships are formed to facilitate research networking in convergence relations. In particular, we used network analysis to investigate how interdisciplinary linkages and convergence research networks has formed over time. We found that the convergence research networks were implemented by the interdisciplinary convergence research support program as intended. We did find that research field with high indegree and outdegree in a network played critical roles on the dynamics and degree of interdisciplinarity. Finally, we could find evidence that the role of liaison brokers triggered relational dynamics in interdisciplinary research collaboration.

• Journal of Arbitration Studies
• /
• v.26 no.4
• /
• pp.111-128
• /
• 2016

Trade between nations has been considered as exchange for material things. According to recent changes in the paradigm of global trade, trade is shifting focus on the exchange of an immaterial being. Among them, the service sector is growing fast and the health service has shown exceptional growth as the healthcare market is consistently expanding. It is also part of the global service targeting people all around the world. People visiting other countries for medical service tend to spend more money and stay longer than a traveler. For these reasons, global medical service is in the spotlight as a promising and higher value-added business. The global medical service industry has been developed around Asia, specifically Thailand, Singapore, India, etc. Compared to them, Korea has come late into the market of global healthcare and the Korean government is striving to attract foreign patients. Nevertheless, there is a lack of effort to make foreign patients visiting Korea revisit Korea. Regarding foreign patients' medical disputes, these are not yet a problem officially; however, the government cannot leave the matter as it is. Medical dispute related with foreign patients is a highly complex issue due to different languages, nationalities, cultures, etc. Particularly, Korea's medical tourism is developed with Chinese visiting Korea for plastic surgery and cosmetic procedure. Thus, the Korean medical tourism market can be crowded with a lot of minor medical agencies, so-called brokers, getting foreign patients connected to the medical institutions. Consequently, Korea has received a large number of complaints and dissatisfaction. No one can predict and know what's supposed to happen in the future. Efforts of the Korean government and medical institute attracting foreign patients could be in vain. In order to take a step forward, this paper will do research on present conditions and look for strategies of improving this industry, focusing on the part of medical agency and contributing to the improvement of the Korean medical tourism industry.