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The paper discusses new scheduling algorithms that are modifications of classical cycle based scheme, named the cycle based algorithm with time alternating priorities and time guard. The classical cycle based algorithm assumes that a given packet stream can be served only in predefined periods while it is not entitled to receive service in the periods dedicated to serve other packet streams. This...
The rise of the network economy and E-commerce has pushed the rapid development of logistics market. The Multi-tier Shuttle Warehousing System (MSWS) as a new autonomous unit load storage/retrieval system, which flexibility and work efficiency is much-improved compared with the conventional AS/RS, has attracted more and more attention of logistics enterprises both at home and abroad. MSWS is composed...
Cooling systems consume around 40% of modern data centres' total energy consumption, thus reducing the energy waste in this sector will have positive environmental impact. There exist several cooling methods appropriate for particular conditions. Since environmental conditions, such as air temperature, change on seasonal bases, no single cooling method can be claimed to be the best. In contrast, data...
Thermal management is an important aspect in designing any telecommunication base stations. Cooling is traditionally counted for 25–50% of the total energy consumption for a typical base station. Accordingly, any effort to reduce the cooling load is a considerable merit for base stations' operators. Using outside fresh air directly as coolant, in a stand-alone unit or a combination with an air conditioning...
Existing data management and searching system for Internet of Things uses centralized database. For this reason, security vulnerabilities are found in this system which consists of server such as IP spoofing, single point of failure and Sybil attack. This paper proposes data management system is based on blockchain which ensures security by using ECDSA digital signature and SHA-256 hash function....
In Cognitive Radio Network (CRN) secondary users (SUs) opportunistically access the channel whenever it is not being used by primary users (PUs). The CRN Medium Access Control (MAC) protocol needs to sense the channel to find out the availability of spectrum. In this paper we propose a hybrid sensing mechanism for SUs to access the channel in CRN environment. In the proposed hybrid sensing mechanism...
Data acquisition systems for large-scale high-energy physics experiments have to handle hundreds of gigabytes per second of data, and are typically implemented as specialized data centers that connect a very large number of front-end electronics devices to an event detection and storage system. The design of such systems is often based on many assumptions, small-scale experiments and a substantial...
Efficient content retrieval is crucial for Named Data Delay Tolerant Networking (NDDTN). Previous studies have shown that using social properties reasonably can improve availability of forwarding data packets, reduce overhead and delay. In this paper, a forwarding strategy, called RIF based on Region of Interest (ROI), is proposed and put forward for NDDTN. RIF computes cumulative visiting time and...
Edge cloud computing is a trending paradigm, which extends cloud computing by additionally utilizing computing resources at the network edge, e.g., at mobile base stations. Especially personalized services can be instantiated or migrated close to end users, which improves the latency and supports user mobility. However, the placement of the service chains is crucial for the performance of the services...
In this paper, based on the dimethyl ether plant process and production process control system, the optimal design of DME control system is studied and the simulation system are established. First of all, the production equipment is regarded as the research object, and through the device operation requirements and device characteristics of structural analysis, and combined with the DCS control system...
Datacenter networks are becoming crucial foundations for our information technology based society. However, commercial datacenter infrastructure is often unavailable to researchers for conducting experiments. In this work, we therefore elaborate on the possibility of combining commercial hardware and simulation to illustrate the scalability and performance of datacenter networks. We simulate a Datacenter...
The main goal of this paper is to manage the switching on/off of servers in a data center during time to adapt the system with incoming traffic changes to ensure a good performance and a reasonable energy consumption. In this work, the system is modeled by a queue then, an optimization algorithm is designed to manage energy consumption and quality of service in the data center. For several systems,...
We present direct performance measurements for four popular scientific simulations on the Knights Landing (KNL) platform. Performance numbers for Broadwell processors are provided for contrast. The applications (NAMD, LAMMPS, GROMACS and CP2K) were selected from among the ten most used in the QCT developer cloud as well as best representative of workloads used by many users and, given their diversity,...
This paper studies how to consolidate Virtual Machines (VMs) on physical severs in order to minimize the energy consumption in Cloud data centers. In Cloud data centers, a major energy consumption component is the physical servers, and it is a way to save the energy by consolidating VMs onto fewer VMs and shut down the idle physical servers. However, executing more VMs on fewer physical servers should...
In this paper, we present an environment for the simulation of DRDoS attacks and protection mechanisms against them. The main difficulties of simulating attacks of this type are listed, the ways of their solution in the form of a system approach are shown.
Wikipedia is one of the most popular information platforms on the Internet. The user access pattern to Wikipedia pages depends on their relevance in the current worldwide social discourse. We use publically available statistics about the top-1000 most popular pages on each day to estimate the efficiency of caches for support of the platform. While the data volumes are moderate, the main goal of Wikipedia...
Fog computing is a model in which data and processing are concentrated on devices at the edge of the network, rather than almost entirely in the cloud. This new paradigm tries to solve the latency and bandwidth issues that the current cloud systems have to deal with, and also addresses the scalability problems caused by the exponential growth of the number of smart devices due to the success of the...
the aims of this study is to analyze staff scheduling in the Hotel X in Kuwait, as well as, reducing waiting time in queue and developing effective customer service through finding the optimal employees schedule without hiring new staff. The study will be approached by building a simulation model using Arena in order to optimize employees scheduling within reception and housekeeping department during...
We study a single location supply system for repairable spare parts. The system consists of a multi-server repair shop and inventory with ready-to-use spare parts. When a failed part is received, a new (or as-good-as-new) replacement part is sent back, and the failed part is forwarded to the repairshop. In the case of unavailability of spare parts, failed requests are backordered and fulfilled when...
Information-Centric Networking (ICN) has emerged as a promising way for the efficient content delivery over the Internet, and it can be seen as a super large-scale caching distributed system. However, as one of the most important problems, the cache consistency issue, which refers to whether cached contents in routers are outdated, is still not investigated thoroughly in ICN. Thus, in this paper,...
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