Two-way Communication Network Research Articles

A Demand Response and Battery Storage Coordination Algorithm for Providing Microgrid Tie-Line Smoothing Services

This paper presents a demand response (DR) and battery storage coordination algorithm for providing microgrid tie-line smoothing services. A modified coordinating control strategy is implemented through two-way communication networks to manage distributed heat pumps in a microgrid for smoothing the tie-line (connect the microgrid to the main grid) power fluctuations. A total of 1000 residential electric heat pumps and a battery storage system are modeled to demonstrate the effectiveness and robustness of the proposed algorithm. The impact of outdoor temperature changes and customer room temperature preferences is considered in the simulation. The results show that coordinating with DR programs can significantly reduce the size of conventional energy storage systems for large-scale integration of renewable generation resources in microgrids and improve the power quality.

Semi-blind two-way AF relaying over Nakagami-m fading environment

In this paper, we investigate semi-blind opportunistic amplify-and-forward (AF) selection relaying in two-way dual-hop cooperative communication networks on independent Nakagami-m fading channels. This system is compared to channel state information (CSI)-assisted opportunistic AF selection relaying (CSIA-OAF) where the relays use variable gains for the amplification. In semi-blind opportunistic AF scenario (SB-OAF), the relays use partial CSI-fixed gains to amplify the received signals. In this work, we first derive the expression of the signal-to-noise ratio (SNR) in the case of SB-OAF selection relaying. The obtained SNR is used to process the bounds of average sum-rate, outage probability, and average symbol error rate (SER). Numerical results are used to show the performance of the proposed SB-OAF system compared to the CSIA-OAF relaying. The comparison shows that the cost of the significant reduction of the proposed SB-OAF complexity is obtained for a slight loss in performance compared to CSIA-OAF scenario.

An Communication and Battery Performance Evaluation of the Demand Response and Battery Storage Coordination System Potential for Providing Microgrid Tie-Line Smoothing Services

In this paper, an communication and battery performance evaluation is discussed for a demand response and battery storage coordination algorithm, which provides a new way of microgrid tie-line smoothing service. A battery storage system and a total number of 1000 heat pumps are modeled to demonstrate the algorithm. A temperature priority list (TPL) model is used to describe the behavior of the heat pumps. Besides, a control strategy via a two-way communication networks is implemented to smooth the tie-line fluctuations. Then considering in a no ideal communication environment, the impacts of the unexpected changes of the on/off status of the heat pumps on the simulation results are studied. Meanwhile, the impacts of different numbers of batteries and batteries with different charging rates are also referred. The results show that coordinating the heat pumps and batteries can significantly smooth the fluctuations brought by the integration of the renewable resources such as the wind and solar power. The switching status changes of the heat pumps, the numbers and charging rate of the batteries also have great influence on the proposed smoothing performance.

Design Considerations of a Centralized Load Controller Using Thermostatically Controlled Appliances for Continuous Regulation Reserves

This paper presents design considerations for a centralized load controller to control thermostatically controlled appliances (TCAs) for continuous regulation reserves (CRRs). The controller logics for setting up the baseline load, generating priority lists, issuing dispatch commands, and tuning the simplified forecaster model using measurement data are described. To study the impacts of different control parameter settings on control performance and device lifetimes, a system consisting of 1000 heating, ventilating, and air-conditioning (HVAC) units in their heating modes is modeled to provide a CRR 24 hours a day. Four cases are modeled to evaluate the impact of forecasting errors, minimum HVAC turn-off times, response delays, and consumer overrides. The results demonstrate that a centralized TCA load controller can provide robust, good quality CRRs with reduced communication needs for the two-way communication network and inexpensive load control devices. Most importantly, because the controller precisely controls the aggregated HVAC load shapes while maintaining load diversity, the controllable and measurable load services that it provides can be used for many other demand response applications, such as peak shaving, load shifting, and arbitrage.

스마트 그리드용 통신망 아키텍처 시뮬레이션 방법

본 논문은 최근 다양하게 진행되고 있는 스마트그리드 관련 연구개발에 있어 양방향 정보 전송을 위한 통신망 아키텍처 시뮬레이션 방법에 관한 것이다. 제주에서의 실증 사업 및 다양한 기기별 시범사업을 통해 대두되는 스마트미터를 비롯한 다양한 스마트그리드 구성용 전력설비들의 정보전송 트래픽 시뮬레이션을 위한 방법론을 제시함으로서 스마트그리드 통신망 아키텍처 설계에 대한 기반을 제공하고자 한다. This paper shows the method for simulating the two-way communication network to transmit information in Smart Grid, which is currently investigated by many researchers. The simulation method can be basically applied to analysis of data traffic for various electric devices such as smart meters, which were tested in Jeju island and massively deployed with nationwide scale.

Energy Sensing and Monitoring Framework with an Integrated Communication Backbone in the Energy Efficient Intelligent Buildings

Building environments are significant sources of global energy consumption. To create energy efficient buildings, the first step is to sense and monitor all the energy-consuming appliances in the buildings and record all the energy consumption information. After that, appropriate energy saving policies can be decided and the instructions can be sent to the control devices to apply the energy saving adjustments. To do that, in-building two-way communication networks are needed to connect all the sensors to collect information as well as to send control instructions. However, most of the current devices are provided by separate manufacturers and with separate network infrastructures and so there is not much integration and interaction among different subsystems. In this paper, we envision a new energy sensing and monitoring framework with integrated communication backbone in the intelligent building environments. Specifically, through comprehensive comparisons and investigations, we study different candidate communicating media and protocols like wireline, wireless, and power-line communications technologies that potentially can be used in the intelligent buildings to realize the goals of coordination, integration, and energy efficiency. Also, we propose an extension "smart box" for integration of the devices before the maturity of the standardization process. Cloud computing and smart phone technologies are also introduced to realize the goals of improving energy efficiency and promote global sustainability.

Optimal Channel and Relay Assignment in OFDM-Based Multi-Relay Multi-Pair Two-Way Communication Networks

Efficient utilization of radio resources in wireless networks is crucial and has been investigated extensively. This letter considers a wireless relay network where multiple user pairs conduct bidirectional communications via multiple relays based on orthogonal frequency-division multiplexing (OFDM) transmission. The joint optimization of channel and relay assignment, including subcarrier pairing, subcarrier allocation as well as relay selection, for total throughput maximization is formulated as a combinatorial optimization problem. Using a graph theoretical approach, we solve the problem optimally in polynomial time by transforming it into a maximum weighted bipartite matching (MWBM) problem. Simulation studies are carried out to evaluate the network total throughput versus transmit power per node and the number of relay nodes.

A Two-Way Communication Network to Meet the Needs of the Infection Prevention & Control and Hospital Epidemiology During Times of Crisis and Routine Events Through Surveys and Technical Advances: The SHEA APIC Communication Network 2007

A Two-Way Communication Network to Meet the Needs of the Infection Prevention & Control and Hospital Epidemiology During Times of Crisis and Routine Events Through Surveys and Technical Advances: The SHEA APIC Communication Network 2007

Slotted idle signal multiple access scheme for two-way centralized wireless communication networks

We propose a random multiple access scheme named S-ISMA/CD (slotted idle signal multiple access with collision detection) for a centralized wireless communication network where upstream and downstream traffic are transmitted over separate channels. Two versions of the scheme, S-ISMA/CD1 and S-ISMA/CD2, are studied in this paper. The S-G (throughput versus offered load) performance of both schemes are evaluated. We also study the dynamic behavior of the system with finite population of terminals on the upward channel. By using EPA (equilibrium point analysis), a fluid approximation method, the throughput and delay performance is evaluated. As a result, it is shown that both schemes have high channel efficiency although S-ISMA/CD1 has a little better performance on the downward channel while S-ISMA/CD2, is easier in implementation and more reliable in operation.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Hoapital closure: a review of the research into the attitudes and feelings of hospital staff and the implications for managers facing run-down and closure

In this paper the available research on staff attitudes and feelings of hospital staff facing the closure of their long-stay hospital is presented. A simple model focusing upon frequent managerial problems during the process of closure is proposed and discussed. Good two-way communication networks, regular supervision/support, ongoing staff training, and the compilation of a personal portfolio are considered. Some tentative research-based suggestions for managers embarking upon closure are presented.

Gainsharing: A technique to improve management-employee relations and mine productivity

The intent of this article is to discuss a potentially cost-effective means of increasing mine production through improved management-employee relations. This article will specifically examine one particular technique—gainsharing. This involves two fundamental elements. The first is a working committee of personnel from the workforce and management whose primary purpose is to evaluate suggestions from employees on ways of improving the work or production process. An additional and equally important objective is to develop a trusting relationship between the employees and management through this two-way communication network. The second element of the gainsharing technique is a bonus plan in which employees are paid a bonus based on the amount of production increase over a base level for a prescribed time period. The key to a successful gainsharing plan, or to any other human factor management program or technique, is to establish a trusting and open relationship between employees and management. This technique must be “a way of life” for management and not just an attempt to increase productivity. The gainsharing plan is an excellent initial technique for developing this trusting relationship because it develops a communication network which shows employees that they have an input into the company's success, and that management is willing to listen and reward them as a group for their ideas and efforts.

Teletext-like information delivery using broadcast polling

Teletext is an information system that uses the continuous one-way broadcast of information pages as a delivery mechanism. Teletext systems are simple to operate and, because their performance is insensitive to user loads, can accomodate an unlimited number of users. This, however, is achieved at the expense of having to undertake superfluous transmissions, i.e., page broadcasts that do not satisfy any outstanding requests. In this paper, we first derive an expression representing the proportion of superfluous transmissions in a teletext system for any given cyclic sequence of page broadcasts. Next, we propose a broadcast polling information delivery scheme. This scheme insures that no superfluous transmissions take place, at the expense of requiring a two-way communication network, and incurring a polling overhead. We investigate, through the use of simulation, the response time performance of the broadcast polling scheme and how it relates to that of a teletext system.

Efficiency of dissemination of information in one-way and two-way communication networks

Efficiency of dissemination of information in one-way and two-way communication networks

Traffic flow information for minimum cost routing procedures

For a two-way communications network in which each link is assigned a cost per traffic unit, a minimum cost routing policy (MCR) routes the required traffic between two nodes along the path with least cost. This paper describes a new technique for computing the Composite Flow Requirement between any two nodes. This is the sum of the traffic requirement between the two nodes and all other traffic requirements whose paths pass through both of the nodes. Knowing the Composite Flow Requirement between any two nodes gives vital planning information about the traffic flow patterns in the network. The technique of this paper brings practical utility to the concept of Composite Flow Requirement by substantially reducing computation effort.