• Proceedings of the Korean Operations and Management Science Society Conference
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• 2003.11a
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• pp.358-361
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• 2003

As the information and communication technology has been developed, demand for internet and multimedia is increased and customer's needs becomes diverse. Therefore, the convergence of fixed and mobile networks has emerged. Fixed - Mobile Convergence (FMC) service means that it provides users with one type of services from network access to billing regardless of networks and terminal. FMC service is expected to provide an advanced value with both networks providers and users. Wireless local area network (WLAN) and 2.3㎓ HPi are promising services that will generate enormous demands among FMC services. For that reason, this paper investigates the trend of WLAN and HPi in Korea and abroad and suggests future deployment based on reviewing the literature.

• Proceedings of the IEEK Conference
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• 2003.11c
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• pp.117-120
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• 2003

PON (Passive Optical Network) is an emerging local subscriber access architecture that provides more bandwidth and services to subscriber than DSL (Digital Subscriber Line and HFC (Hybrid-Fiber Coaxial) network. A PON is a point-to-multipoint optical network with no active elements in the signals' path from source to destination. Advantages of using PON for a subscriber access network include large coverage area, reduced fiber deployment, multicast and broadcast capabilities, reduced cost of maintenance (due to devices being passive), and ease of upgrades to higher bit rate or additional wavelengths. PON uses WDM (Wavelength Division Multiplexing) technique that transmits the downstream and upstream data at each different wavelength. For transmitting the CATV (Community Antenna television) service through PON network, we give out additional wavelength. This study shows the available TPS (Triple play service) architecture using CATV overlay EPON (Ethernet PON) architecture and analyzes the effects of EPON-based CATV transmission by measuring the power loss fur each wavelength and the power range of the available analog wavelength and RF.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.990-993
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• 2006

NGN(next generation network)망에서는 기존의 통신 서비스 및 인터넷 서비스들이 통합된 형태로 망이 구성됨과 동시에 서비스가 이루어 질것이다. 현재는 각자 독립적인 시스템으로 독립적인 서비스를 제공하지만, 향후에는 이러한 서비스들이 통합 및 융합과정 거처 통합된 형태로 서비스되고, 사용자 입장에서 언제 어떤 네트워크를 통해서도 동일한 서비스를 제공 받을 수 있을 것이다. 또한 여기에 그치지 않고 새로운 서비스의 창출이 예상되는바 본 논문에서는 이러한 서비스의 일환으로 텔레매틱스 서비스에 대한 NGN망과의 연계를 위한 새로운 구성도를 제시하고 및 적용을 위한 시나리오를 제안할 것이다. 텔레매틱스 기술은 이미 여러 표준화 단체에서 표준 작업이 수행되고 있으며, 산업체에서는 부분적인 위치정보제공 등의 서비스를 시작하고 있다. 그러나 아직 초기단계이며 NGN 망에서의 적용에 대한 사항은 이루어지고 있지 않은 실정으로 본 논문에서 향후 NGN 환경에서는 텔레매틱스 적용을 위한 시나리오를 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.10a
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• pp.122-125
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• 2018

최근 다양한 네트워크 서비스에 대한 수요가 증가함에 따라 Service Function (SF)의 동적 구성을 위한 유연한 모델이 요구된다. Service Function Chaining (SFC)은 일련의 SF로 구성된 새로운 네트워크 서비스 배포 모델을 정의한다. Software Defined Networking (SDN)은 제어 평면을 중앙 집중화함으로써 네트워크 트래픽 제어를 단순화하여 SFC동작에 중요한 역할을 한다. SDN 기반 SFC(SD_SFC)는 SF 장애를 감지하기 위한 모니터링 시스템이 필요하다. 그러나 기존의 모니터링 방식은 모든 SF에 Monitoring Agent(MA)를 배치하기 때문에 높은 시그널링 비용을 가진다. 본 논문에서는 최소한의 SF에 MA를 배치함으로써 시그널링 비용을 줄이는 SFC모니터링 방식을 제안한다. 제안하는 SF selection 알고리즘은 최적화된 SF 집합을 사용하여 오버로드된 SF를 반환하여 MA를 배치한다. 우리는 제안 시스템의 효율성을 평가하기 위해 테스트베드 구현을 통해 실험하였다. 실험 결과에 따르면 우리는 기존 방식에 비해서 시그널링 비용을 59.2% 절감하였다.

• Electronics and Telecommunications Trends
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• v.36 no.4
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• pp.1-12
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• 2021

The competition to lead the next generation of mobile technologies, 6G, is underway while the deployment of 5G has not been implemented worldwide. ITU-R plans to develop technical requirements and standards after completing the 6G Vision by 2023. It can be considered too early to have a concrete view of the 6G core network architecture from this timeline. However, major stakeholders have started making their presence felt by publishing their views. From updated analysis on the technology and service trends proposed, we present a list of research directions on 6G core network from several perspectives: distribution of network functions to nearer edge locations; future fixed-mobile convergence, including low earth orbit satellites; highly-precise QoS guarantee; supporting an extremely wide variety of service requirements; AI-native automation and intelligence; and aligning with the evolution of radio access network.

• International journal of advanced smart convergence
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• v.12 no.4
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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.

• The Journal of Korean Institute of Next Generation Computing
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• v.14 no.5
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• pp.7-18
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• 2018

Recently, serverless computing is spotlighted. Because it supports the development of application based on micro-service. Micro-service means a small-scale service that can operate independently. Applications with micro-service units have the advantage of enabling individual updates, easy and fast deployment. In addition, it has the advantage of supporting various languages and platforms for each service. Therefore many enterprise are trying to change from monolithic architecture to micro-service based architecture. However, there is a lack of research on methods and baseline for micro-service construction. In this paper, a method is proposed to construct the micro-service unit by analyzing UML design in monolithic application. It also shows the proposed approach can reconstruct monolithic application into micro-service based unit by implementing the constructed micro-services in a real serverless platform environment. In addition, the results of the comparative evaluation with the related studies are presented.

• Journal of the Korea Society of Computer and Information
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• v.10 no.6 s.38
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• pp.355-364
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• 2005

Ubiquitous environment can be supported by various service on networked appliance, sensors and devices. In home network and telematics, open service gateway is widely used for ubiquitous environment and Present environment for service installation, deployment and execution. Service gateway is a middle layer which is located between service and various devices in ubiquitous environment and offers a unique opportunity for pervasive computing as a potential framework for achieving interoperability between various sensors, home appliances. and networked devices. In ubiquitous environments, these services must support the mobility among service gateway because users and devices has a mobility characteristic. However the OSGi framework supports only a remote installation of a bundle, which is a unit that installs and deploys services. This paper develops a system that can manage bundles for supporting this dynamic bundle's mobility between service gateway. This system we are proposing implements a bundle form which can perform in an OSGi framework as well as manage the mobile services. As a result, mobility in a ubiquitous computing environment will be supported more efficiently.

• Journal of Navigation and Port Research
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• v.35 no.3
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• pp.243-251
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• 2011

The container ports have been increasingly changed according to the industry structure and differentiated customer's needs. So it seems to need the differentiated service strategies to have their competitiveness. To assess the customer requirements objectively, this paper associated the service process of container ports with the service quality scale by using the Quality Function Development(QFD). This paper analysed the service process of Busan port and then compared it with those of Shanghai port and Tokyo port which are the typical port of the northeast asia. Also, after drawing the importance of the service process as well as its priorities by representing the relation between service quality scale and processes of the container ports, this paper proposed the House of Quality(HOQ) for service quality improvements.

• The KIPS Transactions:PartC
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• v.18C no.1
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• pp.23-30
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• 2011

Recently internet protocol television (IPTV) service is becoming a typical emerging service enabled on broadband networks. Through the Internet which cannot support quality of service (QoS) beyond best-effort (BE) policy, how to manage and maintain its service quality is an important and essential issue for successful deployment and settlement of IPTV service. In particular, the current measurement scheme that mostly depends on specific equipments should be replaced with one that supports realtime and constant measurement achieved on a user's own will. Therefore, this paper proposes a scheme so-called 'user centric realtime measurement' of IPTV service. The developed software, which is installed in a set-top box (STB) at a user's premise, measures and reports the quality of IPTV service in realtime. In order to verify the performance and accuracy of the developed software, a number of tests are performed comparing to the measurement values from two major measurement equipments. The result of the tests shows that the measurement by the implemented software is significantly reliable.