• Title/Summary/Keyword: Resource Evaluation

Search Result 1,520, Processing Time 0.035 seconds

Improved Resource Allocation Scheme in LTE Femtocell Systems based on Fractional Frequency Reuse

  • Lee, Insun;Hwang, Jaeho;Jang, Sungjeen;Kim, Jaemoung
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • v.6 no.9
    • /
    • pp.2153-2169
    • /
    • 2012
  • Femtocells provide high quality indoor communications with low transmit power. However, when femtocells are applied in cellular systems, a co-channel interference problem between macrocells and femtocells occurs because femtocells use the same spectrum as do the macrocells. To solve the co-channel interference problem, a previous study suggested a resource allocation scheme in LTE cellular systems using FFR. However, this conventional resource allocation scheme still has interference problems between macrocells and femtocells near the boundary of the sub-areas. In this paper, we define an optimization problem for resource allocation to femtocells and propose a femtocell resource allocation scheme to solve the optimization problem and the interference problems of the conventional scheme. The evaluation of the proposed scheme is conducted by System Level Simulation while varying the simulation environments. The simulation results show that the proposed scheme is superior to the conventional scheme and that it improves the overall performance of cellular systems.

Towards Resource-Generative Skyscrapers

  • Imam, Mohamed;Kolarevic, Branko
    • International Journal of High-Rise Buildings
    • /
    • v.7 no.2
    • /
    • pp.161-170
    • /
    • 2018
  • Rapid urbanization, resource depletion, and limited land are further increasing the need for skyscrapers in city centers; therefore, it is imperative to enhance tall building performance efficiency and energy-generative capability. Potential performance improvements can be explored using parametric multi-objective optimization, aided by evaluation tools, such as computational fluid dynamics and energy analysis software, to visualize and explore skyscrapers' multi-resource, multi-system generative potential. An optimization-centered, software-based design platform can potentially enable the simultaneous exploration of multiple strategies for the decreased consumption and large-scale production of multiple resources. Resource Generative Skyscrapers (RGS) are proposed as a possible solution to further explore and optimize the generative potentials of skyscrapers. RGS can be optimized with waste-energy-harvesting capabilities by capitalizing on passive features of integrated renewable systems. This paper describes various resource-generation technologies suitable for a synergetic integration within the RGS typology, and the software tools that can facilitate exploration of their optimal use.

Resource Demand and Price Prediction-based Grid Resource Transaction Model (자원 요구량과 가격 예측 기반의 그리드 자원 거래 모델)

  • Kim, In-Kee;Lee, Jong-Sik
    • Journal of KIISE:Computing Practices and Letters
    • /
    • v.12 no.5
    • /
    • pp.275-285
    • /
    • 2006
  • This paper proposes an efficient market mechanism-based resource transaction model for grid computing. This model predicts the next resource demand of users and suggests reasonable resource price for both of customers and resource providers. This model increases resource transactions between customers and resource providers and reduces the average of transaction response times from resource providers. For prediction accuracy improvement of resource demands and suggestion of reasonable resource price, this model introduces a statistics-based prediction model and a price decision model of microeconomics. For performance evaluating, this paper measures resource demand prediction accuracy rate of users, response time of resource transaction, the number of resource transactions, and resource utilization. With 87.45% of reliable prediction accuracy, this model works on the less 72.39% of response time than existing resource transaction models in a grid computing environment. The number of transactions and the resource utilization increase up to 162.56% and up to 230%, respectively.

A Study for DHRMIS S/W Quantitive Quality Evaluation (국방 인사정보 S/W체계의 정량적 품질평가 연구)

  • Rho, Seung-Dam;Park, Dea-Woo
    • Journal of the Korea Society of Computer and Information
    • /
    • v.13 no.4
    • /
    • pp.273-280
    • /
    • 2008
  • This paper is thing for a quantitive quality evaluation in national Defense Human Resource Management Information S/W system development. Apply a quantitive quality evaluation way to be based on an international standard to admonish at ISO/IEC 9126. Proposed 6 basis of count, and set up sub 27 items detailed functionality, reliability, use anger, efficiency, maintenance anger, a transplant result, and inspection of quality table wrote the Matrix measured S/W quality to a chart. Studied a quantitive evaluation plan of a Defense Human Resource Management Information S/W system to see weight by the priority order that reflected a characteristic of a national defense business to a Purpose of a subject user, and Presented. It is 80% in quantitive quality evaluation application satisfied under 8, Very Satisfied 7(87.5%) Satisfied 1(12.5%) of Defense Human Resource Managers and judgment worked as marked so that satisfaction of reliability and a user regarding functionality was high and there will be contribute to an elevation of defense capabilities as analyze efficient national defense S/W use and effect.

  • PDF

Performance Evaluation of the Internet Phone based on Resource Reservation Protocol (자원 예약 프로토콜에 기반한 인터넷 폰의 성능분석)

  • 조재만
    • Proceedings of the Korea Society for Simulation Conference
    • /
    • 1998.03a
    • /
    • pp.27-31
    • /
    • 1998
  • The growing usage of multimedia communication applications with specific bandwidth and real-time delivery requirements has created the needs for quality of service(QoS). In response to the growing demand for an integrated services, the Reservation Protocol(RSVP) has been designed to exchange resource reservation among routers in the internet. RSVP protocol provides the quality of service for real-time applications but the network efficiency is reduced because of the limited bandwidth. In order to use network resources efficiently. We compare the resource efficiency of traditional reservation methods with that of the proposed method and evaluate the performance of the internet phone.

  • PDF

Resource-constrained Scheduling at Different Project Sizes

  • Lazari, Vasiliki;Chassiakos, Athanasios;Karatzas, Stylianos
    • International conference on construction engineering and project management
    • /
    • 2022.06a
    • /
    • pp.196-203
    • /
    • 2022
  • The resource constrained scheduling problem (RCSP) constitutes one of the most challenging problems in Project Management, as it combines multiple parameters, contradicting objectives (project completion within certain deadlines, resource allocation within resource availability margins and with reduced fluctuations), strict constraints (precedence constraints between activities), while its complexity grows with the increase in the number of activities being executed. Due to the large solution space size, this work investigates the application of Genetic Algorithms to approximate the optimal resource alolocation and obtain optimal trade-offs between different project goals. This analysis uses the cost of exceeding the daily resource availability, the cost from the day-by-day resource movement in and out of the site and the cost for using resources day-by-day, to form the objective cost function. The model is applied in different case studies: 1 project consisting of 10 activities, 4 repetitive projects consisting of 40 activities in total and 16 repetitive projects consisting of 160 activities in total, in order to evaluate the effectiveness of the algorithm in different-size solution spaces and under alternative optimization criteria by examining the quality of the solution and the required computational time. The case studies 2 & 3 have been developed by building upon the recurrence of the unit/sub-project (10 activities), meaning that the initial problem is multiplied four and sixteen times respectively. The evaluation results indicate that the proposed model can efficiently provide reliable solutions with respect to the individual goals assigned in every case study regardless of the project scale.

  • PDF

Virtual Network Embedding based on Node Connectivity Awareness and Path Integration Evaluation

  • Zhao, Zhiyuan;Meng, Xiangru;Su, Yuze;Li, Zhentao
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • v.11 no.7
    • /
    • pp.3393-3412
    • /
    • 2017
  • As a main challenge in network virtualization, virtual network embedding problem is increasingly important and heuristic algorithms are of great interest. Aiming at the problems of poor correlation in node embedding and link embedding, long distance between adjacent virtual nodes and imbalance resource consumption of network components during embedding, we herein propose a two-stage virtual network embedding algorithm NA-PVNM. In node embedding stage, resource requirement and breadth first search algorithm are introduced to sort virtual nodes, and a node fitness function is developed to find the best substrate node. In link embedding stage, a path fitness function is developed to find the best path in which available bandwidth, CPU and path length are considered. Simulation results showed that the proposed algorithm could shorten link embedding distance, increase the acceptance ratio and revenue to cost ratio compared to previously reported algorithms. We also analyzed the impact of position constraint and substrate network attribute on algorithm performance, as well as the utilization of the substrate network resources during embedding via simulation. The results showed that, under the constraint of substrate resource distribution and virtual network requests, the critical factor of improving success ratio is to reduce resource consumption during embedding.

A Secure and Efficient Cloud Resource Allocation Scheme with Trust Evaluation Mechanism Based on Combinatorial Double Auction

  • Xia, Yunhao;Hong, Hanshu;Lin, Guofeng;Sun, Zhixin
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • v.11 no.9
    • /
    • pp.4197-4219
    • /
    • 2017
  • Cloud computing is a new service to provide dynamic, scalable virtual resource services via the Internet. Cloud market is available to multiple cloud computing resource providers and users communicate with each other and participate in market transactions. However, since cloud computing is facing with more and more security issues, how to complete the allocation process effectively and securely become a problem urgently to be solved. In this paper, we firstly analyze the cloud resource allocation problem and propose a mathematic model based on combinatorial double auction. Secondly, we introduce a trust evaluation mechanism into our model and combine genetic algorithm with simulated annealing algorithm to increase the efficiency and security of cloud service. Finally, by doing the overall simulation, we prove that our model is highly effective in the allocation of cloud resources.

A Study on the Evaluation of the Long-Term Avoided Generation Cost (장기 회피 발전비용 계산에 관한 연구)

  • Kim, Jong-Ok;Park, Jong-Bae;Kim, Kwang-In;Lee, Sang-Chul
    • Proceedings of the KIEE Conference
    • /
    • 1996.07b
    • /
    • pp.878-882
    • /
    • 1996
  • This paper discusses the definition and concepts, approach methodologies, capable application areas in electricity business, and tentative calculation of avoided generation costs based on the Korea's official long-term generation expansion plan. The objective to evaluate avoided costs of a resource is to supply decision makers with the breakeven cost of a targeting avoided resource. For the evaluation of avoided costs of the Korea's generation system, we consider the pseudo-DSM option which has 1,000MW peak savings, load factor with 70 percent, and life-time With 25 years as the avoided resource. The DSM resource can save the fuel and capacity additions of a electric utility during its life time. The capacity and fuel savings are evaluated from the two different cashflows with and Without the DSM option, which are generated on the basis of the generation system optimization model(WASP-II), independently. The breakeven kWh costs of the DSM option over this 25-year period is projected to be 34.1[won/kWh], which is composed of generation-capacity and fuel avoided costs with 101.139[won/kW] and 17.6[won/kWh], respectively.

  • PDF