Extensions of an integrated approach for multi-resource shop scheduling

In a previous work, we proposed an integrated approach for a rather general shop scheduling problem, with multiresource, flexibility, and nonlinear routings. In this paper, we want to overcome some of the limitations of the approach. In particular, an operation that needs several resources might not need all the resources during its entire processing time. Our first extension allows a resource to be released before the end of the operation. The second extension considers the fact that, for a given operation, one might have to prevent a set of incompatible resources to be chosen.     

基于树形规则的网络安全事件关联分析方法

为了解决网络安全管理中海量数据,误报严重,报警零散的问题,提出了一种基于树形关联规则的网络安全事件关联分析方法.该方法通过对告警出现率与相似度的计算来聚合网络安全事件,并通过对告警可信度的计算来识别误报警.同时,通过树形规则中树节点之间的关系来定义同一类告警,算法能有效地将零散存在的告警组织成为一个完整的攻击.初步的试验表明该方法能够有效地减少告警数量,识别误报和关联安全事件.     

COATES GRAPH APPROACH FOR GENERATING SYMBOLIC NETWORK FUNCTION

In this paper, symbolic code matrix ,constant matrix and count matrix are defined .The first twomatrices are used to describe the elemental expression of augmented matrix and the nede admittance equa-tion is thus obtained. The third matrix is used to obtain the incoming degree matrix, and according to thematrix all the 1- factors of the Coates graph are given. By using the data code, the determinant is expandedand the same items in the expansion are merged. Thus the symbolic network function in which no term can-cellation occurs is generated.     

Distributed self-learning scheduling approach for wireless sensor network

Energy constraints pose great challenges to wireless sensor network (WSN) with battery-powered nodes. But the reduction of energy consumption often introduces additional latency of data delivery. In this paper, a new distributed scheduling approach, self-learning scheduling approach (SSA), is presented in order to reduce energy consumption and to achieve low latency for WSN. This approach, extending the Q-learning method, enables nodes to learn continuous transmission parameter and sleep parameter through interacting with the WSN. We compare SSA with S-MAC protocol and DW-MAC protocol using simulations. The results show that the SSA can make nodes to learn the optimal scheduling policy gradually. The results under different work loads also exhibit that SSA performs much better than S-MAC protocol and DW-MAC protocol in terms of energy consumption and throughput. With regard to latency and maximum queue length, SSA also outperforms the other two MAC protocols in the scenarios, where the collision is serious and the work load is heavy.     

A connectionless approach to integrated network management

As computer networks become more complex and more heterogeneous (often involving systems from multiple vendors), the importance of integrated network management increases. This paper proposes a model to represent an integrated network management environment (INME) combining the emerging Web-based management standards with the proven-and-tried network management solutions promoted by the Internet Activities Board, and centred around the Simple Network Management Protocol. © 1998 by John Wiley & Sons, Ltd.     

基于CIM事件模型的网络管理系统事件机制的实现

基于Web的企业管理(WBEM)技术体系,包括一系列用来统一企业级计算管理环境的管理技术和Internet标准技术,它为企业提供了一种能力,使得企业能开发出一系列集成良好、能与日益兴起的网络技术同步的标准管理工具。WBEM核心标准包括一个数据模型——CIM标准、一个编码规     

综合网管体系结构研究及信息模型建立

通过分析综合网管建设的必要性及当前各种解决方案存在的问题，采用从上至下的思想，提出了一种实用的开放性管理框架，实现了业务管理层和网络管理层之间的无缝融合，可以完成多专业网管系统的综合管理，同时采用LML语言定义了管理信息模型。     

Distributed integrated circuits: an alternative approach tohigh-frequency design

Distributed integrated circuits are presented as a methodology to design high-frequency communication building blocks. Distributed circuits operate based on multiple parallel signal paths working in synchronization that can be used to enhance the frequency of operation, combine power, and enhance the robustness of the design. These multiple signal paths usually result in strong couplings inside the circuit that necessitate a treatment spanning architecture, circuits, devices, and electromagnetic levels of abstraction     

InSyn: integrated scheduling for DSP applications

We present the InSyn algorithm for high-level synthesis of DSP applications. InSyn combines allocation and scheduling of functional, storage, and interconnect units into a single phase and uses the following unique optimizations. (i) The concept of register states (free, busy, and undecided) is used for optimizing registers in a partial schedule where lifetimes of data values are not yet available. (ii) Reusable data values and broadcast are used to alleviate bus contention. (iii) InSyn can alternate between performance-guided and resource-guided measures. For example, InSyn can forgo its priority in favor of completing partially evaluated paths when the availability of allocated registers becomes low. (iv) InSyn ran selectively increase execution time of noncritical operations to alleviate bus contention. (V) InSyn can optimize and trade off distinct (functional units, interconnect, and registers) resource sets concurrently leading to more area-delay efficient designs. (vi) InSyn utilizes estimation tools towards resource allocation, design space pruning, and evaluation of synthesized designs. The experiments show that the features incorporated in inSyn result in very good designs     

基于攻击图模型的网络安全评估研究

介绍了利用攻击图模型方法分析计算机网络攻击行为的基本原理,给出了攻击图生成算法。研究了利用攻击图对网络系统安全性进行风险分析的方法。通过一个虚拟的网络环境对攻击图生成算法和网络系统的安全性分析评估方法进行了验证。     

Resource management in an integrated optical network

We propose a novel integrated optical network switching architecture. The proposal offers an approach to signaling for the purpose of transport on an all-optical network of optical and nonoptical legacy network traffic. In order to provide effective end-to-end control and efficient transport services, new signaling and control techniques are required. Standard organizations such as Optical Interworking Forum (OIF) and Internet Engineering Task Force have developed interface methods between client and transport networks, as well as signaling processes for resource allocation. We propose a network controller, which implements interfaces for such integration in the intermediate future, as well as provides a feasible path for the long-term objective of all optical networking. Performance and capacity issues for these systems introduce new dimensions to the existing set of networking problems, since optical paths can now be set up in real-time. There are two main contributions in this paper: (1) functional composition of a network controller, which translates legacy signaling to optical connection signaling and path establishment and (2) determining when to issue an optical connection request based on the current network conditions such as link utilization, so that the integrated optical network can operate efficiently. Analytical approximations, as well as simulation results for call blocking performance are also presented.     

The SSD graph: a tool for project scheduling and visualization

A graphic tool, the SSD (structure, states and deviation) graph, is proposed for three important phases of project management; planning and scheduling, control, and evaluation. The SSD graph represents the structure, states (scheduled and actual states), and deviation of a system. A project management system using the SSD graph is developed, and it visualizes the actual state of a project and keeps the historical record of the project performance. This system allows a project manager to see the overall status and to review the project performance. Several applications have shown its usefulness for scheduling and control of project systems     

Systolic algorithms for some scheduling and graph problems

We consider a simple model of a linear systolic array with serial input/output and one-way data communication. We show that such an array can be used to solve some scheduling and graph problems efficiently. The systolic algorithms are developed in two stages. First an algorithm on a restricted type of sequential machine is constructed. Then the sequential machine algorithm is transformed into a systolic algorithm. The transformation can be done automatically and efficiently.This research was supported in part by NSF Grants DCS-8304756, DCR-8420935, and DCR-8604603.     

Time and power scheduling in an ad hoc network with bidirectional relaying and network coding

Network coding (NC) is a technique that allows intermediate nodes to combine the received packets from multiple links and forwarded to subsequent nodes. Compared with pure relaying, using NC in a wireless network, one can potentially improve the network throughput, but it increases the complexity of resource allocations as the quality of one transmission is often affected by the transmission conditions of multiple links. In this paper, we consider an ad hoc network, where all the links have bidirectional communications, and a relay node forwards traffic between the source and the destination nodes using NC. All transmissions share the same frequency channel, and simultaneous transmissions cause interference to each other. We consider both digital NC and analog NC strategies, referred to as DNC and ANC, respectively, and schedule transmission time and power of the nodes in order to maximize the overall network throughput. For DNC, an optimum scheduling is formulated and solved by assuming that a central controller is available to collect all the link gain information and make the scheduling decisions. Distributed scheduling schemes are proposed for networks using DNC and ANC. Our results indicate that the proposed scheduling scheme for DNC achieves higher throughput than pure relaying, and the scheduling scheme for ANC can achieve higher throughput than both DNC and pure relaying under certain conditions. Copyright © 2013 John Wiley & Sons, Ltd.     

An integrated network management approach for managing hybrid IP and WDM networks

Pacing toward converged voice and data networks, the IP over WDM/OTN network architecture supported by MPLS satisfies the advanced next-generation network requirements to provide fast, reliable and flexible connectivity services. Acknowledging the advantages of networks that utilize the above technologies, operators evolve their networks in that direction, while continuously working to provide new services to attract customers. In their effort to facilitate such services in a flexible and cost-effective way, an integrated network management system for IP and WDM technologies is a prerequisite. This article proposes a management architecture that provides for this integration. Different approaches to integrating multilayer networks are briefly described covering both the control and management planes. The adopted solution is based mainly on the management plane utilizing the control plane wherever possible. Additionally, preliminary results from the evaluation of the configuration management functionality of the proposed system in a testbed environment are presented, concluding with future extensions that also cover fault and performance management.     

一种用于光网络的高效业务疏导辅助图及动态业务疏导算法

利用辅助图,研究了光网络中的业务疏导技术。为解决传统的辅助图存在着模型复杂、波长通道的带宽利用率不高等问题,提出一种新的业务疏导辅助图,能够更有效地利用已有波长通道,避免低效的路由;为了降低动态业务疏导算法的复杂度,提出了一种简化的k最短路径算法,并以此为基础提出了多种疏导策略。仿真结果表明,本文提出的辅助图及其业务疏导算法,可以有效地减少阻塞率。     

适用于波长交换光网络（WSON）的波长旋转图模型设计

将网络虚拓扑链路及关联波长均匀分布到旋转球体的表面,建立了新型的波长交换光网络(WSON)的波长旋转图模型,并基于旋转图模型提出了路由波长分配(RWA)新策略及算法.仿真结果表明,每条链路的总波长数分别为4和8时,新策略算法的阻塞率平均降低5.03%和9.71%,资源利用率平均提高3.3%和1.54%.该模型用于解决具有波长转换能力的RWA问题效果明显.     

Virtual engineering: an integrated approach to agile manufacturing machinery design and control

A virtual manufacturing approach for designing, programming, testing, verifying and deploying control systems for agile modular manufacturing machinery are proposed in this paper. It introduces the concepts, operations, mechanisms and implementation techniques for integrating simulation environments and distributed control system environments so that the control logic programs that have been programmed and verified in the virtual environment can be seamlessly transferred to the distributed control system environment for controlling the real devices. The approach looks to exploit simulation in a much wider range of applications with great advantages in the design and development of manufacturing machine systems. In particular, it facilitates the verification of the runtime support applications using the simulation model before they are applied to the real system. Mechanisms that allow runtime data to be collected during operation of the real machinery to calibrate the simulation models are also proposed. The system implemented delivers a powerful set of software tools for realising agile modular manufacturing systems.