• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권5호
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• pp.1267-1285
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• 2012

Wireless Body Area Networks (WBANs) deal with variety of healthcare services with diverse Quality of Service (QoS) requirements. However, QoS handling is a challenging problem in such networks. In general, QoS related problems can be addressed from different layers in the networking protocol suite. Design of an efficient QoS aware Medium Access Control (MAC) protocol can address this problem in MAC layer. This paper analyzes the QoS requirements of WBAN, identifies the requisites of QoS handling system, and outlines the trends that are being followed for its advancement with focus on QoS issues at MAC layer. We review some prior works, compare them, and analyze the current research concerned with problem of providing QoS in WBAN. We also explore some open issues and discuss them.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 ICEIC The International Conference on Electronics Informations and Communications
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• pp.57-60
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• 2004

Next generation wireless network is evolving toward IP-based network that can various provide multimedia services. A challenge in wireless mobile Internet is support of quality of service over wireless access networks. DiffServ architecture is proposed for evolving wireless mobile Internet. In this paper we propose an algorithm for optimal buffer partitioning which requires the minimal channel capacity to satisfy the QoS requirements of input traffic. We used a partitioned buffer with size B to serve a layered traffic at each DiffServ router. We consider a traffic model with a single source generates traffic having J $(J\geq2)$ quality of service (QoS) classes. QoS in this case is described by loss probability $\varepsilon_j$. for QoS class j. Traffic is admitted or rejected based on the buffer occupancy and its service class. Traffic is generated by heterogeneous Markov-modulated fluid source (MMFS).

• 전자통신동향분석
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• 제19권1호통권85호
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• pp.9-21
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• 2004

차세대 통신 시스템은 다양한 IP 멀티미디어 응용을 지원하고, 유비쿼터스 서비스를 제공할 수 있도록 다양한 유무선 통신 시스템들이 IP 기반의 멀티네트워크로 통합될 것이다. 이러한 차세대 통신 시스템에서 IP 기반 멀티미디어 응용을 효율적으로 지원하기 위하여 종단간 QoS 제공이 중요한 문제가 된다. 본 고에서는 3세대 이동통신과 차세대 백본 네트워크(NGN)에서 연구되고 있는 QoS 제공 방안을 살펴본다. 그리고, 3세대 이후의 통신 시스템을 위하여 IP 네트워크에 기반을 두고 이질적인 무선 시스템들의 통합에 대해 연구하고 있는 프로젝트에서 All-IP화에 따른 종단간 QoS 제공 방안을 살펴본다. 그리고, 다양한 통신 시스템들이 IP 기반의 백본 네트워크로 통합되어 All-IP화된 차세대 통신 시스템의 개략적 구조를 제시하고, 이를 기반으로 종단간 QoS 제공을 위하여 연구되어야 할 주요 사항들을 살펴본다.

• 한국컴퓨터정보학회논문지
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• 제20권10호
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• pp.53-59
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• 2015

In this paper we propose a resource management scheme which allocates hierarchical resources stepwise based on the users' QoS requirement of each service in the macro-femtocell overlaid LTE-Advanced network. Our proposed scheme adjusts the transmission rate to the minimum which guarantees the allowable minimum requirement of delay for each user service. In this way it minimizes the interference on the adjacent channels and it is able to increase the resource utilization efficiency. Simulation results show that our scheme provides better performances than the conventional one in respect of the outage probability and data transmission throughput.

• 한국IT서비스학회:학술대회논문집
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• 한국IT서비스학회 2006년도 추계학술대회
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• pp.366-371
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• 2006

To compensate the loss of leased-line subscribers and the excessive increase of residential xDSL (Digital Subscriber Line) ones of KT (Korea Telecom), the paper proposes the service model by which it can reinstate the subscription ratio status through employing next generation OSS (Operations Support System) and highquality MPLS (Multiprotocol Label Switching) VPN (Virtual Private Network). It also describes diverse modules comprising NeOSS (New OSS) of KT, followed by detailed accounts regarding the service delivery process of KT VPN. Shortly visited are the primary constituents as well as configuration parameters of MPLS VPN. Finally the network topology along with a feasible service model case is presented.

• International journal of advanced smart convergence
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• 제12권4호
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• pp.126-133
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• 2023

Recent advancements in cloud service virtualization technologies have witnessed a shift from a Virtual Machine-centric approach to a container-centric paradigm, offering advantages such as faster deployment and enhanced portability. Container orchestration has emerged as a key technology for efficient management and scheduling of these containers. However, with the increasing complexity and diversity of heterogeneous workloads and service types, resource scheduling has become a challenging task. Various research endeavors are underway to address the challenges posed by diverse workloads and services. Yet, a systematic approach to container orchestration for effective cloud management has not been clearly defined. This paper proposes the DRA-Engine (Dynamic Resource Allocation Engine) for resource scheduling in container orchestration. The proposed engine comprises the Request Load Procedure, Required Resource Measurement Procedure, and Resource Provision Decision Procedure. Through these components, the DRA-Engine dynamically allocates resources according to the application's requirements, presenting a solution to the challenges of resource scheduling in container orchestration.

• 대한임베디드공학회논문지
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• 제19권3호
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• pp.141-149
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• 2024

This paper proposes a configuration automation technique to minimize service interruption time in the event of a corporate network access layer switch failure. The automation is achieved without the need for a separate external system, as the network setting information is stored in a container inside the switch, enabling rapid recovery without requiring separate storage. This approach ensures the continuity of network services and demonstrates the efficiency of configuration automation. The proposed technique improves corporate network stability by providing a quick response in the event of a failure.

• Asia pacific journal of information systems
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• 제30권1호
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• pp.94-119
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• 2020

Digital platforms characterized by network effects enable provisioning of various types of services and provide a mechanism for linking producers and consumers. Identifying the key Quality of Service attributes of such platforms is vital for their continued success and growth. In this paper, a set of quality attributes for platforms is first extracted from different extant quality models. Then actual user feedback data from three platform providers are analysed and mapped against the set of quality attributes to determine the key attributes that are relevant. These findings are corroborated with qualitative data from interviews of different stakeholders. The results show that service quality characteristics are important to the success of platforms. Functional characteristics of platforms assume importance where the digital contributions of the platform is higher. Apart from these, 'fitness for use' as a major determinant of quality is also important in digital platforms.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권5호
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• pp.1567-1587
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• 2014

Virtual Machine (VM) resource management is crucial to satisfy the Quality of Service (QoS) demands of various multimedia services in a media cloud platform. To this end, this paper presents a VM resource allocation model that dynamically and optimally utilizes VM resources to satisfy QoS requirements of media-rich cloud services or applications. It additionally maintains high system utilization by avoiding the over-provisioning of VM resources to services or applications. The objective is to 1) minimize the number of physical machines for cost reduction and energy saving; 2) control the processing delay of media services to improve response time; and 3) achieve load balancing or overall utilization of physical resources. The proposed VM allocation is mapped into the multidimensional bin-packing problem, which is NP-complete. To solve this problem, we have designed a Mixed Integer Linear Programming (MILP) model, as well as heuristics for quantitatively optimizing the VM allocation. The simulation results show that our scheme outperforms the existing VM allocation schemes in a media cloud environment, in terms of cost reduction, response time reduction and QoS guarantee.

• 한국시뮬레이션학회논문지
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• 제20권1호
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• pp.61-67
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• 2011

스마트 TV 시스템은 차세대 핵심 네트워크 서비스 중의 하나로서 통신과 미디어 산업에 급격한 변화를 가져올 것이다. 하지만, 스마트 TV 시스템은 동시접속자가 증가하면 서비스 품질이 급격하게 저하되는 문제가 발생하고 있다. 콘텐츠를 수많은 사용자에게 동시에 전송하는 것은 서버와 네트워크에 큰 부담으로 작용하기 때문이다. 서버의 수용능력의 한계는 서버 클러스터를 구성함으로써 어느 정도 해결할 수 있지만 네트워크의 수용능력의 한계는 부하와 혼잡의 발생 위치를 파악하고 추가적인 자원을 설치하여 해결하는데 어려움이 있다. 이를 해결하기 위해 현재까지 많은 기법들이 제안되었지만 기존의 연구들의 성능분석은 대부분 왕복시간(round-trip time), 다운로드 시간, 패킷 손실 비율과 같은 사용자 중심의 성능척도에만 초점이 맞춰져 있고 스마트 TV 서비스 품질에 중요한 영향을 미치는 동시접속과 전체 네트워크의 부하와 혼잡을 무시하는 경향이 있다. 본 논문에서는 실제 인터넷 테스트베드인 PlanetLab을 이용하여 스마트 TV 서비스 폼질에 중요한 영향을 미치는 사용자 그룹핑 알고리즘을 네트워크의 혼잡도와 부하중심으로 성능분석을 한다.