• Journal of information and communication convergence engineering
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• 제7권2호
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• pp.135-140
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• 2009

The wide deployment of wireless access technologies and the integration of various access network interfaces into a single terminal, allows mobile end-users to be always connected to the IP network, and to use those interface simultaneously. In this paper the CTE provides various access network interfaces capabilities, allowing reception of data over multiple service providers with different characteristics. Considerations for multiple network and service provider environments are regarded as essential for the successful deployment of convergence services in Next Generation Network (NGN). Event Driven Service (EDS) is regarded as a typical convergence service converging different functions of multiple service providers. This paper first describes the deployment model of NGN convergence services for multiple service provider environments. It also covers the service scenario of EDS, a convergence service for multiple service provider environments in NGN. Multiple provider environments stimulates the unified identifier management, namely ubiquitous identification (U-ID), to enable users to be provided convergence services without awareness of multiple provides. Then the designed structure and procedures of U-ID based EDS are given. Finally, the implementation results tested on Korea Advanced Research Network (KOREN) are described.

• 한국IT서비스학회지
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• 제13권3호
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• pp.201-219
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• 2014

This paper considers service deployment and priority optimization for multiple service-oriented applications sharing reusable services, which are deployed as multiple instances in the cloud. In order to handle variations in the workloads of the multiple applications, service instances of the individual reusable services are dynamically provisioned in the cloud. Also service priorities for each application in a particular reusable service are dynamically adjusted. In this paper, we propose an analytic performance model, based on a queueing network model, to predict the expected sojourn times of multiple service-oriented applications, given the number of service instances and priority disciplines in individual reusable services. We also propose a simple heuristic algorithm to search an optimal number of service instances in the cloud and service priority disciplines for each application in individual reusable services. A numerical example is also presented to demonstrate the applicability of the proposed performance model and algorithm to the proposed optimal decision problem.

• 한국통신학회논문지
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• 제21권8호
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• pp.1958-1969
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• 1996

This paper proposed a new approach to adaptive call admission control based on a neural network for multiple service classes with different quality of service (QoS) in the ATM-based Broadband Integrated Services Digital Networks. the proposed method extend Hiramatsu's neural network based "leaky pattern table" method for the single QoS[1, 2, 3] to deal with multiple services with different QoS by constructing multiple pattern tables based on each service's acceptance or rejection at the call set-up requests, and by simultaneously controlling each service's QoS according to the target QoS of the service and the trunk capacity. Computer simulation results on two service classes with different traffic characteristics and different cell loss rates as QoS, highlight good performance and effectiveness of the proposed call admission controller for multiple service classes.e classes.

• 한국산학기술학회논문지
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• 제14권9호
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• pp.4478-4484
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• 2013

기존 모바일 커스터마이제이션 연구는 단일 디바이스의 서비스를 변경하려는 단일 커스터마이제이션 기법으로 수행되어왔다. 그러나, 변경하려는 모바일 서비스가 다중 디바이스에 일괄적으로 적용되기 위해서는 기존의 단일 커스터마이제이션 기법으로는 미흡하다. 본 논문에서는 모바일 서비스의 흐름제어 데이터를 공유하여 다중 디바이스를 커스터마이제이션하기 위한 기법을 제안 한다. 제안하는 다중 커스터마이제이션 기법은 푸시 서비스와 클라우드 서비스를 기반으로 한다.

• Journal of information and communication convergence engineering
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• 제8권5호
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• pp.502-507
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• 2010

Event driven service (EDS) is one of such services administrating different functions of multiple service providers according to the user situation. This paper first describes the service model of EDS, a User-centric Service for multiple service provider environments over the next generation networks. The multiple provider environments stimulates the unified identifier management, namely unified identification (U-ID), to enable users to be provided network services without awareness of multiple providers. Combining these two concepts, i.e., EDS and U-ID, the designed structure of EDS with U-ID and related procedures are given. Finally, the implementation results tested on Korea Advanced Research Network (KOREN) are described.

• 한국시뮬레이션학회논문지
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• 제13권1호
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• pp.41-50
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• 2004

The purpose of this paper is to analyse the manager's policy to maximize the profit in a multiple-server queueing facility with a limited queue capacity. We assume that the level of advertizing effects on the arrival rate of customers to the facility. The model without ‘word of mouth effect’ is assumed that the arrival rate is independent on the qualify of service level. We estimate the service quality by the balking rate of customers from system. We extend this to the model with ‘word of mouth effect’. To achieve the maximum profit, the most important factor is the considerably high utilization of facility for both models. Given service rate, we should maintain an effective arrival rate to some extent. To this end, among the available options, an increase of advertizing effort is more desirable than reducing the fee if the service value of customers remains unchanged. We also investigate whether the variability of service time has a significant impact on determining the optimal policy. The cost of service variability is not so expensive as that in a single server model due to the reduced variability of service times in a multiple-server model.

• 대한전기학회논문지:전력기술부문A
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• 제54권10호
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• pp.500-506
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• 2005

With the advent of electric power systems moving to a deregulated retail electricity market environment, calculating distribution service tariffs has become a challenging theme for distribution industries and tariff regulators. As distribution business remains as a monopoly, it is necessary to be regulated. And as multiple distribution companies compete with each other, it would be efficient to adopt competition to the determination of distribution service tariffs. This paper proposes a method to calculate distribution service tariffs using yardstick regulation, which can lead to competition among multiple distribution companies. The proposed method takes into account not only recovering revenue requirements but also the advantages of the yardstick regulation based on long-term marginal costs of distribution network expansion algorithms. A computer simulation is carried out to illustrate effectiveness of the proposed method and it is estimated that the algorithm can be applied to compute the distribution service tariffs under retail electricity markets.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 하계종합학술대회논문집
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• pp.86-89
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• 1998

Multiple types of information in a multimedia service are delivered though multiple virtual connections on ATM network, while each virtual connection may be controlled independently. A multimedia service requires an associative relationship among multiple information streams to provide required harmonization. There may be required additional traffic descriptors to guarantee the required harmonization among multiple information streams in a multimedia service. For buffering of large bandwidth information stream(e.g., video), extremely large buffer size is necessary, but this approach should not be efficient way to compensate a severely delayed cells/blocks experienced at network. The best way to solve this problem will be minimization of relative-delayed-transfer of cells/blocks to application processes through ATM network control. To minimize a delayed transfer the mapping between relative delay parameter(i.e., associative Group QoS parameters) and per-VC traffic descriptor will be necessary. This paper is present additional functions and parameters to interpret the mapping between relative delay parameters(i.e., associative Group QoS parameters) and per-VC traffic descriptors in ATM API for multimedia application services.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권3호
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• pp.891-910
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• 2021

Previous QoS-aware service composition methods mainly focus on how to generate composite service with the optimal QoS efficiently for a single request. However, in the real application scenarios, there are multiple service requests and multiple service providers. It is more important to compose services with suboptimal QoS and maintain the load balance between services. To solve this problem, in this paper, we propose a service composition method, named as dynamically change and balancing composition method (DCBC). It assumes that the QoS of service is not static, and the services can adjust the value of QoS to gain more opportunities to be selected for composition. The method mainly includes two steps, which are the preprocessing step and the service selection step. In the preprocessing step, a backward global best QoS calculation is performed which regarding the static and dynamic QoS respectively; then guided by the global QoS, the feasible services can be selected efficiently in the service selection step. The experiments show that the DCBC method can not only improve the overall quality of composite services but also guarantee the fulfill ratio of requests and the load balance of services.

• 한국과학교육학회지
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• 제31권6호
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• pp.887-900
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• 2011

생물교사는 자신의 글과 말을 활용하여 지식을 논리적인 과학적 설명의 형태로 변환하여 학생들을 지도한다. 그러므로 생물 예비교사들이 과학적 설명을 구성하는 능력을 확인할 수 있는 개방형 검사가 요구 될 것이다. 하지만 채점자간 일치도, 늦은 피드백과 같은 개방형 검사가 가진 문제로 선택형 검사가 대체 될 수 있을 것이다. 이 연구는 생물 예비교사들의 과학적 진화 설명 구성 능력을 확인함과 동시에 선택형 진화 개념 검사가 개방형 검사 결과를 어느 정도 예측하는지 두 가지를 조사하였다. 생물 예비교사 124명이 참여하였으며 20문항의 진화 개념 선택형 검사도구와 3문항의 실제 사례를 활용한 개방형 검사 문항을 모든 참여자에게 투입하였다. 연구 결과 생물 예비 교사는 선택형 검사 도구에 더 높은 능력을 보였으며 최상위(0 ~ 25%)의 참여자를 제외하고 선택형 검사 도구는 개방형 검사 도구 검사 결과를 예측하지 못하였다. 진화 설명의 일관성, 오개념이 포함되지 않은 순수성, 과학적 설명의 양을 측정한 결과, 선택형 검사 결과는 최상위 집단을 제외하고 다른 집단을 구분하지 못하였다. 또한 이 결과들은 생물 교사들이 과학적 설명의 구성 능력이 지식의 양에 비하여 상대적으로 낮은 것을 확인할 수 있었으며 일부 예비교사들은 오개념과 과학적 개념을 혼합하는 등의 세련되지 못한 과학적 설명을 가지고 있었다. 이 결과는 생물 예비교사들의 개념 평가는 선택형보다 개방형이 더 많은 정보를 제공할 수 있음을 보여주며, 생물 예비교사들을 위한 교사양성 프로그램은 과학적 설명 능력의 신장에 더욱 더 초점을 맞출 것을 제언한다.