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In this work, a hierarchical bin-based legalization approach, HiBinLegalizer, is developed to legalize standard cells with minimal movement. First, a chip is divided into several bins with equal size. Then, starting with the most crowed unlegalized bin, a merging procedure for bins is used to integrate bins into a cross-shape region or a square-shape region until the cell density in that region is...
In this paper, we suppose a new system called MIMO-OCWDM system which combines MIMO with orthogonal complex wavelet division multiplexing (OCWDM). The results are simulated using V-BLAST architecture with different transmit and receive antennas; their performance are analyzed in terms of bit error rate (BER). We evaluate that the performance of MIMO-OCWDM system is much better than that of MIMO-OFDM...
Initialization is an indispensable process for wireless sensor networks since newly deployed sensors lack a reliable infrastructure for communication. Many efforts have been made to address the problem on initialization. However, most of them fall into the category of energy efficiency. In mission-critical scenarios, it is vital to reduce the initialization time in order to gather information as early...
We consider a practical application of intelligent vehicles for intersection traffic control. Specially, we study the intersection traffic control problem using reservation-based intersection traffic control system, which utilizes the information exchange between intelligent vehicles and management agents around the intersections to direct traffic, instead of traffic lights. We focus on how to design...
This article addresses a new area of sensor networks - the anti-sensornet. Though the term anti-sensornet is scattered throughout literature, there is no systematic description of the anti-sensornet. In this article, we provide an introduction to anti-sensornet by analyzing the behaviors of intelligent intruders and the methods used to confront them including hiding sensor networks, enhancing detection...
In this paper we propose a flexible 4-moduli set (2p+k, 2p+1, 2p-1, 22p+1) which is profitable to construct a high-speed residue number system (RNS). We derive a simple reverse conversion algorithm for the proposed moduli set by using Chinese remainder theorem (CRT). The resulting converter architecture mainly consists of simple adders which are suitable to realize an efficient VLSI implementation...
Due to the strict time constraints, the real-time services for multimedia applications in wireless networks are difficult to deal with as a packet scheduler schedules the related packets. The system performance of a base station (BS) mainly also depends on the packet scheduler policy. So far as our knowledge, the relatively existing packet scheduler schemes arrange the packets based on the corresponding...
Currently, vehicles are equipped with forward facing cameras to assist the forensic investigations of events by proactive image capturing from streets and roads. With content redundancy and storage imbalance in this in-network distributed storage system, how to maximize its storage capacity is a challenge. In other words, how to maximize the average lifetime of sensory data (i.e. images generated...
Coverage is a fundamental problem in Wireless Sensor Networks (WSNs). Existing studies on this topic focus on 2D ideal plane coverage and 3D full space coverage. The 3D surface of a targeted Field of Interest is complex in many real world applications; and yet, existing studies on coverage do not produce practical results. In this paper, we propose a new coverage model called surface coverage. In...
This paper focuses on the control redundancy problem due to the increase of control effectors of advanced aircrafts. Based on the current control allocation research, this paper further puts forward the concept of control allocation and management system. The bases sequenced control allocation method is proposed firstly, and then some management strategies are introduced to the control allocation...
Driving is a complex man-machine process, color signal is an important factor for affecting driving fatigue. In the course of driving simulation, using different color signals to stimulate the drivers, through subjective questionnaires and measuring the changes in drivers?? physiological parameters, to research the changing law of the drivers?? heart rate, respiratory rate and other physiological...
Currently, vehicular sensor network (VSN) has been paid much attention for monitoring the physical world of urban areas. We have studied VSNs by utilizing about 4000 taxies and 1000 buses equipped with GPS-based mobile sensors in Shanghai to constitute a virtual vehicular sensor network. The communication-connection intermittence makes the routing issue nontrivial when delay-tolerant applications...
We study mechanism designs for resource management in service overlay, where services are provided by strategic agents. Usually, resources in distributed systems are limited. However, the current mechanism design does not take the capacity of agents into consideration. Traditionally, the Vickrey- Clarke-Groves (VCG) mechanism has been the only method to design protocols so that each strategic agent...
In this paper, we propose one grouped-iterative framework to generate a family of the MIMO detection algorithms. The presented framework not only includes the conventional iterative, grouped, and Chase detection algorithms, but also derives a new low-complexity MIMO detection algorithm. The proposed detection can adjust some parameters to achieve a range of trade-offs between performance and complexity...
We present a mobile sensor system for traffic monitoring (GSSTM), which is a typically Grid application in ShanghaiGrid to provide accurate realtime traffic status information. Several issues and challenges in GSSTM are discussed, such as Grid architecture design, data processing for traffic status estimation, storage strategy of massive data, etc. We implemented a prototype system of GSSTM and carried...
The existing vehicular sensors of taxi companies in most of cities can be used for traffic monitoring, however sensors are always set with a long sampling interval because of communication cost saving and network congestion avoidance. In this paper, we focus on the traffic data processing in vehicular sensor networks providing sparse and incomplete information. A performance evaluation study has been...
Dynamic channel assignment is attracting more and more attentions since it can greatly alleviate the problem of interference in wireless networks. Efficient broadcasting, however, is one of the main problems facing dynamic channel assignment. It is easy to send broadcast packets in a network that is always connected due to the broadcast property of wireless channel. The broadcast property, however,...
The capacity and flexibility of wireless mesh networks (WMNs) can be greatly improved by adopting dynamic channel assignment. However, dynamic channel assignment brings new challenges such as switching overheads and dependency problems. We propose a channel assignment protocol, called the hybrid channel assignment protocol (HCAP) for infrastructure WMNs (I-WMN). To find out a reasonable tradeoff between...
The capacity of wireless ad hoc networks is affected by two key factors: the interference among concurrent transmissions and the number of simultaneous transmissions on a single interface. Recent studies found that using multiple channels can separate concurrent transmissions and greatly improve network throughput. However, those studies only consider that wireless nodes are equipped with only omnidirectional...
Data-intensive Grid applications require huge data transferring between multiple geographically separated computing nodes where computing tasks are executed. For a future WDM network to efficiently support this type of emerging applications, traditional approaches to establishing lightpaths between given source destination pairs are not sufficient because a computing task may be executed on any one...
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