• Title/Summary/Keyword: quality requirements

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Extension of ReInForM Protocol for (m,k)-firm Real-time Streams in Wireless Sensor Networks

  • Li, Bijun;Kim, Ki-Il
    • Journal of information and communication convergence engineering
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    • v.10 no.3
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    • pp.231-236
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    • 2012
  • For real-time wireless sensor network applications, it is essential to provide different levels of quality of service (QoS) such as reliability, low latency, and fault-tolerant traffic control. To meet these requirements, an (m,k)-firm based real-time routing protocol has been proposed in our prior work, including a novel local transmission status indicator called local DBP (L_DBP). In this paper, a fault recovery scheme for (m,k)-firm real-time streams is proposed to improve the performance of our prior work, by contributing a delay-aware forwarding candidates selection algorithm for providing restricted redundancy of packets on multipath with bounded delay in case of transmission failure. Each node can utilize the evaluated stream DBP (G_DBP) and L_DBP values as well as the deadline information of packets to dynamically define the forwarding candidate set. Simulation results show that for real-time service, it is possible to achieve both reliability and timeliness in the fault recovery process, which consequently avoids dynamic failure and guarantees meeting the end-to-end QoS requirement.

Strategies for Container Terminal Development and Operation for the Hub Port in Northeast Asia (동북아 중심항만 구축을 위한 컨테이너 터미널의 개발 및 운영전략)

  • 이철영;최재수;박진수;채양범;신창훈
    • Journal of Korean Port Research
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    • v.12 no.2
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    • pp.161-176
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    • 1998
  • This paper aims to suggest the strategies for Korea port, especially Busan to develope into a viable transhipment center and/or Hub port as the articulation points between mainline and feeder nets. To tackle this goal, the authors clarify the requirements for Korea port which will be critical in determining its position as Hub trough the careful analysis on competitiveness, environmental impact, port policy and capacity, transhipment traffic and inherent ability to generate traffic. The results are summerized as follows. (1) Coping with increasing container volumes, new investment is sustainedly necessary to increase the capacity and inherent ability of container port and create economies of scale. Moreover, increasing port capacity will increase the potential for the Korea port's inclusion into mainline rather than feeder networks. (2) Considering an increasing awareness of need for customer-oriented operations and service quality rather than simply a reliance on infrastructure-led efficiency, privatization of one sort or another and corporation of port have been key strategies in achieving greater efficiency in Korea containerport.

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New Model Course on Training in Operational Use of ECDIS

  • Weintrit, Adam
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.2
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    • pp.367-372
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    • 2006
  • The revision of SOLAS, Chapter V, which entered into force on 1 July 2002, has firmly established the electronic navigational chart as part of the international maritime safety system. Its possible recognition as a paper chart equivalent confirms the considerable safety benefits provided by the official Electronic Chart Display and Information Systems (ECDIS). Elaborated by the Author IAMU Model Course on operational use of ECDIS aims to provide answers to some of the most commonly asked questions regarding various types of electronic charts (ENC, RNC, DNC) and electronic chart systems (ECDIS, RCDS, ECS). Following the earlier adoption of the International Convention STCW 78/95 and IMO model training courses, e.g. IMO Model Course on ECDIS [2], to assist in the implementation of the Convention and the associated IMO Assembly resolutions, a number of IAMU Member Universities had suggested that IAMU should develop model training courses on higher academic level to assist in achieving a more rapid transfer of information and skills regarding new developments in marine technology. The provision of model courses could help instructors improve the quality of their existing courses and enhance their effectiveness in meeting the requirements of the IAMU. In this paper the Author presents the results of two IAMU research projects sponsored by Nippon Foundation, titled 'IAMU Model Course on Training in Operational Use of ECDIS' and 'IAMU Handbook on ECDIS'.

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Fairness-Based Service Admission Scheme for Downlink in Wireless Multi-Service WCDMA Networks (무선 멀티 서비스 WCDMA 네트워크에서의 형평성을 고려한 하향링크 서비스 수락 설계)

  • 노상현;김동우
    • Journal of KIISE:Information Networking
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    • v.30 no.1
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    • pp.65-74
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    • 2003
  • In this Paper, we propose a downlink service admission strategy that considers users QoS requirements by using a novel service quality prediction index for multi-service WCDMA mobile systems. The Proposed downlink service admission strategy is obtained by computing average received Power of each service, assuming a relative other-cell interference factor. With the proposed method we obtain a downlink service admission region where users of different services properly can be admitted. And adding the fairness at the proposed downiinh service admission strategy, we Propose another downlink service admission strategy. In the numerical examples, the downlink service admission region with fairness and the downlink service admission region without fairness of voice service and data services are obtained by proposed downlink service admission strategies, respectively.

Test Supporter for GUI of Mobile Application Software in J2ME Platform (J2ME 기반 모바일 응용 소프트웨어 GUI 자동화 테스트 지원기)

  • Hwang, Sun-Myumg
    • The KIPS Transactions:PartD
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    • v.16D no.3
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    • pp.361-370
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    • 2009
  • Recently, the most mobile application software developers are being faced by short developing time (fast time-to-market), various requirements and requirement changes. In order to overcome the environment, developer should support user friendly GUI and assure the quality from the early developing process using GUI test method. This paper proposes a test method and tool for mobile software GUI, which reduces test time and supports comfortable test environment by user oriented UI design. We implemented a tool based on test scenarios based image flow for high testing accuracy and test case reusability. And the results show the characteristics of the method compared to the existing tools.

An Algorithm for Integrating Versions of Programs using Dynamic Slicing (동적 슬라이싱 기법을 이용한 프로그램 버전들의 통합 알고리즘)

  • Park, Sun-Hyeong;Jeong, Eun-Lee;Park, Man-Gon
    • The Transactions of the Korea Information Processing Society
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    • v.7 no.3
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    • pp.831-841
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    • 2000
  • For the operation of the practical software systems, the development, extension and modification phases are successively needed through the new requirements added and their errors debugging detected. Therefore, if it is possible to integrated the reusable software components and to reorganize them into the new software systems, we can improve the productivity, quality, and cost-effectiveness for he development of software systems. For these reasons, it will be required to research and develop methodology and tools for programs integration which make some programs merged effectively. In the process of merging two versions of a program into one, we can consider that some parts of the two versions are equivalent under the non-interference between them. According to the previous studies the program selected to determine the criterion of non-interference between them. According to the previous studies the program selected to determine the criterion of non-interference was very large, so we have difficulty in integrating many programs practically. In this paper, we propose a new improved algorithm which can reduce the related program size of non-interference criterion yb use of dynamic slicing techniques for integration of two versions of a program, and prove the efficiency of the proposed algorithm by showing some examples.

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Development of Operation Planning System for Worker's Productivity (작업자의 작업성향상을 위한 작업설계시스템의 개발)

  • Lim, Seok-Jin;Park, Byung-Tae;Park, Myon-Woong;Paik, Seung-Yeol;Jeong, Suk-Jae
    • Journal of the Korean Society of Safety
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    • v.22 no.6
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    • pp.74-80
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    • 2007
  • In manufacturing industry, machining technology for metal cutting processes has been considered traditional and economic dimensions such as production cost, production time and quality of a final product. However, owing to governmental regulations and the change of owner's cognizance, the safety of the workers becomes important in those fields. In this paper, the operation planning system developed as a key component of CAPP(Computer Aided Process Planning) system is introduced for milling operations. The main issue in the system is to determine the cutting conditions in achieving a balanced consideration of productivity and worker's safety. For this reason, the system performs the modification process of standard cutting conditions to satisfy those requirements. Related to machining safety in metal cutting, representative and habitual mistakes that operators perform without considering carefully the characteristic of machine or work piece are described and then the detailed algorithm and functions of the developed system is introduced and discussed.

UQoS Management Middleware Framework for Internet-Based Multimedia Application (인터넷 기반 멀티미디어 응용을 위한 UQoS 관리 미들웨어 프레임워크)

  • Yoon, Eun-Young;Ghim, Soo-Joong;Yoon, Yong-Ik;Kim, Sung-Hoon;Chang, Chul-Soo
    • The KIPS Transactions:PartB
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    • v.9B no.5
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    • pp.549-554
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    • 2002
  • This paper proposes a UQoSM (User Qualify of Service Middleware) framework for multimedia application systems. UQoSM system is extended the existing event service model added to the event monitoring, reflective event filtering and event dispatcher for supporting multimedia application systems. Especially, this paper is concentrated on providing suitable reflective event filtering function for multimedia application service system in order to meet various user requirements under inter-based environment. It means this system provides high QoS to users. In addition, it results in decreasing network traffic as unnecessary event information is filtered from network.

Minimum Variable Bandwidth Allocation over Group of Pictures for MPEG Video Transmission (MPEG 동영상 전송을 위한 GOP 단위의 최소 변경 대역폭 할당 기법)

  • Kwak, Joon-Won;Lee, Myoung-Jae;Song, Ha-Yoon;Park, Do-Soon
    • The KIPS Transactions:PartC
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    • v.9C no.5
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    • pp.679-686
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    • 2002
  • The transmission of prerecorded and compressed video data without degradation of picture quality requires video servers to cope with large fluctuations in bandwidth requirement. Bandwidth smoothing techniques can reduce the burst of a variable-bit rate stream by prefetching data at a series of fixed rates and simplifying the allocation of resources in the video servers and the network. In this paper, the proposed smoothing algorithm results in the optimal transmission plans for (1) the smallest bandwidth requirements, (2) the minimum number of changes in transmission rate, and (3) the minimum amount of the server process overhead. The advantages of the proposed smoothing algorithm have been verified through the comparison with the existing smoothing algorithms in diverse environments.

Study on Effective Management of Heterogeneous Networks (이기종 네트워크의 효율적 관리에 연구)

  • Cho, Sok-Pol
    • The Journal of Information Technology
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    • v.8 no.3
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    • pp.131-142
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    • 2005
  • The principles on which the Internet was designed and has evolved were first laid out in an explicit way 20 years age. The basic principle is that in layered communications network such as the Internet, functions should always be implemented at the end systems whenever the option exists. This applies to all functions that can be implemented either in the network or at the end systems. End-to-end arguments have recently been reexamined as the Internet and its uses have evolved, and a new set of requirements has begun to emerge. In addition to these, it add a new, and perhaps more important, requirement to this list in the case of heterogeneous networks: the proliferation of unpredictable wireless networks. Wireless networks must cope with dynamic link conditions not present in wired infrastructures, which place a heavy burden on quality of service management solutions. Managing QoS in the face of constantly changing operating conditions demands dynamic management approaches that span multiple layers in the protocol stack. Such as cross-layer design approaches have recently received attention in the context of cellular and mobile special networks. This article introduce the notion of network predictability and describe its relationship to achievable QoS. This relationship is used to propose a framework for cross layer design that can be used to guide development efforts and direct investment decisions for future networks.

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