• Title/Summary/Keyword: reserve service

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A Reservation-based HWMP Routing Protocol Design Supporting E2E Bandwidth in TICN Combat Wireless Network (TICN 전투무선망에서의 종단간 대역폭을 보장하는 예약 기반 HWMP 라우팅 프로토콜 설계)

  • Jung, Whoi Jin;Min, Seok Hong;Kim, Bong Gyu;Choi, Hyung Suk;Lee, Jong Sung;Lee, Jae Yong;Kim, Byung Chul
    • Journal of the Korea Institute of Military Science and Technology
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    • v.16 no.2
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    • pp.160-168
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    • 2013
  • In tactical environment, tactical wireless networks are generally comprised of Tactical MANETs(T-MANETs) or Tactical WMNs(T-WMNs). The most important services in tactical network are voice and low rate data such as command control and situation awareness. These data should be forwarded via multi-hop in tactical wireless networks. Urgent and mission-critical data should be protected in this environment, so QoS(Quality of Service) must be guaranteed for specific type of traffic for satisfying the requirement of a user. In IEEE 802.11s, TDMA-based MAC protocol, MCCA(MCF Controlled Channel Access), has a function of resource reservation. But 802.11s protocol can not guarantee the end-to-end QoS, because it only supports reservation with neighbors. In this paper, we propose the routing protocol, R-HWMP(Reservation-based HWMP) which has the resource reservation to support the end-to-end QoS. The proposed protocol can reserve the channel slots and find optimal path in T-WMNs. We analyzed the performance of the proposed protocol and showed that end-to-end QoS is guaranteed using NS-2 simulation.

Comparison on the education effects of cardiopulmonary resuscitation application using smart-phone -Focused on animation CPR and modified pocket CPR- (스마트폰을 활용한 심폐소생술 어플리케이션의 교육 효과 비교 -애니메이션을 활용한 심폐소생술과 변형된 포켓 심폐소생술을 중심으로-)

  • Park, Hee;Cho, Keun-Ja
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.1
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    • pp.480-489
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    • 2015
  • This study aimed to compare the education effect of easily accessible cardiopulmonary resuscitation (CPR) applications on smart-phones. The differences of performance and accuracy of CPR between animation CPR group and modified Pocket CPR group in Reserve Officers' Training Corps students of K university were evaluated by 2010 AHA guidelines. Data were collected from May 19, 2012 to May 20, 2012. There was no statistically significant difference between both of group in the performance and accuracy of CPR. However, the modified Pocket CPR group showed significant increase in the accuracy of chest compression depth (26.4%, p<.05), while the animation CPR group showed significant increase in the accuracy of chest compression location after the education (25.2%, p<.01). In conclusion, the methods using advantage and complementing disadvantage of animation CPR application and Pocket CPR application could help that people could easily access and perform to CPR.

A Study on the Verification of Heavy Overhaul Maintenance Allowances for the Maintenance Shop (시뮬레이션과 BPR을 응용한 Layout 기반의 철도차량기지 중정비 검수 여유율 검증)

  • Choi, Sung-Hwan;Lee, Hi-Sung
    • Journal of the Korean Society for Railway
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    • v.13 no.1
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    • pp.9-15
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    • 2010
  • When designing the size of a heavy maintenance shop for rolling stock, it is required to arrange buildings and facilities in the minimum site so as to improve the maintenance efficiency. However, the fluctuation rate (hereinafter "allowance rate") on which factors such as service and maintenance fluctuation should be applied when estimating the size of the maintenance shop has been used without verification. The objective of the study is to calculate a reasonable allowance rate and to review its appropriateness through the analysis of the facilities layout and process simulation to absorb the above elements into the staying time in the heavy maintenance shop. Since the working time, in this study, is assumed to be average working time, 10~20% was given to the standard deviation of working time in consideration of difference between workers, and possible allowance rate was drawn by analysis of the simulation results. In the future, it is required to optimize the size of the shop by applying appropriate allowance rate through scientific review of such factors as O&M plan, R/S reserve rate, capability of the shop, outsourcing rate, standard work amount, and so on.

Performance Improvement on MPLS On-line Routing Algorithm for Dynamic Unbalanced Traffic Load

  • Sa-Ngiamsak, Wisitsak;Sombatsakulkit, Ekanun;Varakulsiripunth, Ruttikorn
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.1846-1850
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    • 2005
  • This paper presents a constrained-based routing (CBR) algorithm called, Dynamic Possible Path per Link (D-PPL) routing algorithm, for MultiProtocol Label Switching (MPLS) networks. In MPLS on-line routing, future traffics are unknown and network resource is limited. Therefore many routing algorithms such as Minimum Hop Algorithm (MHA), Widest Shortest Path (WSP), Dynamic Link Weight (DLW), Minimum Interference Routing Algorithm (MIRA), Profiled-Based Routing (PBR), Possible Path per Link (PPL) and Residual bandwidth integrated - Possible Path per Link (R-PPL) are proposed in order to improve network throughput and reduce rejection probability. MIRA is the first algorithm that introduces interference level avoidance between source-destination node pairs by integrating topology information or address of source-destination node pairs into the routing calculation. From its results, MIRA improves lower rejection probability performance. Nevertheless, MIRA suffer from its high routing complexity which could be considered as NP-Complete problem. In PBR, complexity of on-line routing is reduced comparing to those of MIRA, because link weights are off-line calculated by statistical profile of history traffics. However, because of dynamic of traffic nature, PBR maybe unsuitable for MPLS on-line routing. Also, both PPL and R-PPL routing algorithm we formerly proposed, are algorithms that achieve reduction of interference level among source-destination node pairs, rejection probability and routing complexity. Again, those previously proposed algorithms do not take into account the dynamic nature of traffic load. In fact, future traffics are unknown, but, amount of previous traffic over link can be measured. Therefore, this is the motivation of our proposed algorithm, the D-PPL. The D-PPL algorithm is improved based on the R-PPL routing algorithm by integrating traffic-per-link parameters. The parameters are periodically updated and are dynamically changed depended on current incoming traffic. The D-PPL tries to reserve residual bandwidth to service future request by avoid routing through those high traffic-per-link parameters. We have developed extensive MATLAB simulator to evaluate performance of the D-PPL. From simulation results, the D-PPL improves performance of MPLS on-line routing in terms of rejection probability and total throughput.

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A Method on the Realization of QoS Guarantee in the Grid Network (그리드 네트워크에서의 QoS 보장방법 구현)

  • Kim, Jung-Yun;Na, Won-Shin;Ryoo, In-Tae
    • Journal of Digital Contents Society
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    • v.10 no.1
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    • pp.169-175
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    • 2009
  • Grid computing is an application to obtain the most efficient performance from computing resources in terms of cost and convenience. It is also considered as a good method to solve a problem that cannot be settled by conventional computing technologies such as clustering or is requiring supercomputing capability due to its complex and long-running task. In order to run grid computing effectively, it needs to connect high-performance computing resources in real-time which are distributed geographically. Answering to the needs of this grid application, researchers in several universities with Argonne National Laboratory in the USA (ANL) as the main axis have developed Globus. It is noticed, however, that the quality of service (QoS) is not guaranteed when certain jobs are exchanged through networks in the context of Globus. To tackle with this problem, the ANL has invented Globus Architecture for Reservation and Allocation (GARA). The researchers of this paper constructed a testbed for evaluating the ability to reserve resource in the GARA system and implemented the GARA code for it. We analyzed the applied results and discussed future research plans.

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Domestic current situation and Improvement plan Consideration of Electricity Design & Supervision System (전기설계.감리제도의 합리적인 운영방안에 관한 고찰)

  • Jeong, Yeon-Hae;Nam, Ki-Beom;Sin, Hwa-Yeong;Jeong, Hyeong-Yong;Lee, Jong-Hyuk;Jun, Young-Su
    • Proceedings of the KIEE Conference
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    • 2007.04b
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    • pp.10-15
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    • 2007
  • For the introduction of the electricity of the special design and supervision system to Protect the faulty-workmanship of the electricity equipment and to reserve the electricity safety, last 1995 "Electricity Technology Management Act" were carried out enactment. March 2002, we introduced the pre-Qualification system that is selected the competent company about the electricity design and supervision service over so much capacity which is ordered by the Public institution such as the nation, local autonomous entity, government investment institute and so on. December 2005, the electricity equipment over so much capacity was taken the housing construction plan's approval by the housing act in case, the municipal or district governor with the authority to approve who selected the electricity supervision company according to the pre-Qualification system. Due to the introduction of the system, we could expect the rights and interests increase of the consumer by eradicating dumping of the close relationship between supervision company and the builder, reduction and concurrent position of the supervisor, according to confirm the quality of the electricity equipment and electricity safety. In spite of introducing of the system, the problems occured as reducing the electricity designer's task range compared with different field, modifing the supervisor's rank system rationally, because of researching about the electricity design and supervision technique lacks. Also, KEEA(Korea Electric Engineers Association) manage the caller of the electricity design and supervisor(company or people), but the problems occured as opening to the public about the curler management, introducing automatic bidding system and We need the solution plan about this. Consequently, we consider the present situation of the domestic and outside and problem about the electricity design and supervision system in this paper, try to present rational operation plan through this.

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MAC Protocol based on Resource Status-Sensing Scheme for Integrated Voice/Data Services (음성/데이타 통합 서비스를 위한 자원 상태 감지 기법 기반 MAC프로토콜)

  • Lim, In-Taek
    • Journal of KIISE:Information Networking
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    • v.29 no.2
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    • pp.141-155
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    • 2002
  • A medium access control protocol is proposed for integrated voice and data services in the packet CDMA network with a small coverage. Uplink channels are composed of time slots and multiple spreading codes for each slot. This protocol gives higher access priority to the delay-sensitive voice traffic than to the data traffic. During a talkspurt, voice terminals reserve a spreading code to transmit multiple voice packets. On the other hand, whenever generating a data packet, data terminals transmit a packet based on the status information of spreading codes in the current slot, which is received from base station. In this protocol, voice packet does not come into collision with data packet. Therefore, this protocol can increase the maximum number of voice terminals.

The Study on Satisfaction of the Damage Compensation Caused by the Released Asiatic Black Bear (반달가슴곰 피해에 대한 보상 만족도 연구)

  • Kim, Bo-Hyun;Kim, Young-Geun;Yang, Doo-Ha;Skripova, K.V.;Lee, Kyong-Jae
    • Korean Journal of Environment and Ecology
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    • v.22 no.5
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    • pp.536-543
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    • 2008
  • This study was carried out to review the satisfaction with compensation for damage caused by the released Asiatic Black Bears into the whole area of Jirisan National Park and to offer basic data for reasonable conflict management with local community. A questionnaire survey was conducted from Jun. 2007 to Dec. 2007 on 93 subjects who got their compensations for the bear damage from 2004 until 2007. The results stayed at a middle level of satisfaction with the proper damage indemnity program with as mean $3.14{\pm}0.85$ points on the basis of 5 point scale. The satisfaction with compensation was found to have a significant correlation with the factors, such as income levels, whether to agree to restoration project, compensation money and compensation procedures. The compensation plan through the Animal Damage Compensation Consultation Committee was accepted positively(mean: $3.3{\pm}0.9$); however, to the compensation plan for the 80% compensation of actual amounts of bear damage, was acknowledged negatively(mean: $2.6{\pm}1.11$).

A Study on Legal Argument to the Overstorage Charge on the Long Storage Containers (장기체화 화물에 대한 경과보관료 적용에 관한 법률쟁점 - 부산지방법원 2011. 8. 18. 2009가합14442 판결 평석 -)

  • Ji, SangGyu
    • Journal of Korea Port Economic Association
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    • v.28 no.4
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    • pp.275-298
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    • 2012
  • Terminal operators have provided special services such as loading, discharging, stowage of cargo to the owner, and carriers of the sea, which contribute the domestic and international logistics. For smooth flow of logistics, container terminal should reserve spaces for inbound and outbound logistics. However, if it is unable to provide the spaces, which can be caused by labour strikes or terminal lockouts and so on, national logistic system and financial management of terminal operators can be seriously affected. In order to minimize these kinds of problems, terminal operators impose high rate of charges ("overstorage charge") to the accumulated cargoes and/or containers, which are stipulated in terminal service agreement. Nevertheless, if there is no terminal service agreement with an owner of cargo and/or container, any kind of charge can cause legal problems (conflict ??) between the cargo and terminal operator. In this regard, I would like to study on the definition of overstorage charge and the legal issue of it based on the Busan district court's judgment. In particular, I will propose a special right of commercial lien and public auction for terminal operators to settle accumulated cargoes in container terminal.

A Wireless Traffic Load-Balancing Algorithm based on Adaptive Bandwidth Reservation Scheme in Mobile Cellular Networks (셀룰러 망에서 적응적 대역폭 예약 기법을 이용한 무선 트래픽 부하 균형 알고리즘)

  • 정영석;우매리;김종근
    • Proceedings of the Korea Institute of Convergence Signal Processing
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    • 2001.06a
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    • pp.21-24
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    • 2001
  • For very large multimedia traffic to be supported successfully in wireless network environment, it is necessary to provide Quality-of-Service(QoS) guarantees between mobile hosts(clients). In order to guarantee the Qos, we have to keep the call blocking probability below target value during handoff session. However, the QoS negotiated between the client and the network may not be guaranteed due to lack of available channels for traffic in the new cell, since mobile clients should be able to continue their on-going sessions. In this paper we propose a efficient load-balancing algorithm based on the adaptive bandwidth reservation scheme for enlarging available channels in a cell. We design a new method to predict the mobility of clients using MPT(mobility profile table). This method is then used to reserve a part of bandwidths for handoff calls to its adjacent cells and this reserved bandwidth can be used for handoff call prior to new connection requests. If the number of free channels is also under a low threshold value, our scheme use a load-balancing algorithm with a adaptive bandwidth reservation. In order to evaluate the performance of our algorithm, we measure the metrics such as the blocking probability of new calls and dropping probability of handoff calls, and compare with other existing schemes.

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