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Date 24-25 April 2003

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Displaying Results 1 - 25 of 3615287
  • Virgina's critical infrastructure protection study

    Publication Year: 2003 , Page(s): 177 - 182
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (478 KB) |  | HTML iconHTML  

    Virginia's Critical Infrastructure Protection (CLP) study implements risk assessment and management methodologies upon eight case studies located in the commonwealth of Virginia. Research was undertaken because of a growing national concern involving infrastructures that are so vital that their incapacity or destruction would jeopardize the security of the United States. Furthermore, the project's pertinence is palpable in the wake of 9-11. The report demonstrates the efficacy of the risk assessment and risk management methodologies and its output will be utilized in the development of a computer-based tool for use by Virginia Department of Transportation (VDOT) employees. The net result of the project's analysis extends beyond the immediate benefits of the risk management output generated by individual case studies. Rather, the analysis below helped highlight errors and highlight commonalities that will be utilized in the development of a more robust and more effective computer-based risk management tool. View full abstract»

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  • Dynamic stability of off-road vehicles

    Publication Year: 2004 , Page(s): 1849 - 1853 vol.2
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (625 KB)  

    This paper offers a unified measure for dynamic stability of off-road vehicles that accounts for the tendency to tipover, slide, or loose contact with ground during static equilibrium and in motion. The contacts between the vehicle and ground are assumed rigid, and all wheels are assumed active. The dynamic stability measure is determined by computing the range of velocity and acceleration of the vehicle's center of mass that satisfies a set of dynamics constraints. The upper velocity limit serves as a dynamic stability measure, whereas the acceleration limit at zero speed serves as a static stability measure. In this paper, we demonstrate the approach for a four-wheel drive planar vehicle. View full abstract»

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  • Toward spreadsheet-based data management in distributed enterprise environment

    Publication Year: 2004 , Page(s): 578 - 581 Vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (527 KB) |  | HTML iconHTML  

    We propose a feasible approach on managing the heterogeneous data in distributed enterprise environment, which leverages the born data presentation and calculation ability of spreadsheet to unify the enterprise information access to heterogeneous data sources through its core component: universal distributed data interchanging middleware (UDDIM). Afterwards, we focus on the problem of unifying all kinds of heterogeneous data sources from heterogeneous OS in Intranet through CORBA and Internet through SOAP into one single "Spreadsheet World". And this "Spreadsheet World" is bridged to and fro other information worlds through information gateway technology. XML technique is used to achieve data exchanging regardless of the differences of low-level communication mechanisms. As a result, all clients can access and utilize information from one single "Spreadsheet World" in variety of ways, both powerfully and easily. View full abstract»

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  • Reed-Muller universal logic module networks

    Publication Year: 1993 , Page(s): 105 - 108
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (220 KB)  

    Describes Reed-Muller universal logic modules (RM-ULMs) and their use for the implementation of logic functions given in Reed-Muller (RM) form. A programmed algorithm is presented for the synthesis and optimisation of RM-ULM networks. The level-by-level minimisation procedure is based on the selection of control variables at different levels with the aim of maximising the number of discontinued branches and hence minimising the number of modules required to implement a given function. The algorithm is programmed in Fortran and can be used to realise fixed-polarity generalised Reed-Muller (GRM) expansions of any polarity and any number of variables. View full abstract»

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  • Nonlinear control methods for planar carangiform robot fish locomotion

    Publication Year: 2001 , Page(s): 427 - 434 vol.1
    Cited by:  Papers (30)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (641 KB) |  | HTML iconHTML  

    Considers the design of motion control algorithms for robot fish. We present modeling, control design, and experimental trajectory tracking results for an experimental planar robotic fish system that is propelled using carangiform-like locomotion. Our model for the fish's propulsion is based on quasi-steady fluid flow. Using this model, we propose gaits for forward and turning trajectories and analyze system response under such control strategies. Our models and predictions are verified by experiment. View full abstract»

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  • Matrix formulation of frequency transformation for 2D nonseparable denominator state-space digital filters

    Publication Year: 2004 , Page(s): II-73 - II-76 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (447 KB) |  | HTML iconHTML  

    This paper proposes matrix formulation of frequency transformation for 2D digital filters in terms of the state-space equations. In order to derive the formulation, we extend Mullis and Roberts' matrix formulation of 1D frequency transformation to 2D case. The proposed formulation is very suitable for both analysis and realization of the transformed state-space digital filters since the resultant state-space filter has smaller dimension than that of the filters obtained by conventional formulation and consists of simple algebraic operations such as matrix addition, multiplication, inverse and so on. Moreover, our formulation can be easily implemented in MATLAB without any complicated algorithm. View full abstract»

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  • Passive microwave remote sensing for estimation of rice water content in Vietnam

    Publication Year: 2003 , Page(s): 905 - 907 vol.2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1349 KB) |  | HTML iconHTML  

    Rice is one of the world's major staple foods that accounts for 15% of the world's total cultivated area. In Asia where 94% of the world's rice is produced, rice is the main source of food and a significant source of income. In Vietnam, rice cultivated area occupies 47% of agricultural land of the country. Rice growing conditions are essential for crop monitoring and yield prediction while rice water content decides the evolutional process and yield per year of the crop. A model for passive microwave emission from water-rice fields, i.e. rice planted on a water layer, is presented in the paper. Field experiments carried out by scientists of Space Technology Application Centre (STAC), Institute of Physics, National Centre for Natural Science and Technology of Vietnam (NCST) using L- and C-band radiometers on water-rice fields are described. An estimation of the rice water content was made that well agreed to ones received by direct measurements. The results are interesting and useful for crop monitoring of agricultural services. View full abstract»

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  • Microcoils for biosensors fabricated by focused ion beam (FIB)

    Publication Year: 2005 , Page(s): 209 - 212
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (343 KB) |  | HTML iconHTML  

    Microcoils integrated with standard CMOS technology show an increasing interest in biosensor applications, as they allow very high sensitivity and selectivity. Simulations of the electromagnetic behaviour of the microcoils suggest the way for optimizing their properties. The sensitivity can be improved essentially by decreasing the external radius of the device, and the inductance variation increases with the number of rings, so the optimum configuration corresponds to a small coil with the highest number of rings. Focused ion beam (FIB) shows optimal capabilities to achieve these design rules, as it is a very versatile and precise direct-write technique. In this work, the fabrication process of reduced-size coils using FIB is described, as well as their preliminary characterization, showing the ability of this technique for achieving optimized sensing devices. View full abstract»

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  • Independent lightweight 3D graphics for mobile phones

    Publication Year: 2004 , Page(s): 562 - 567
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (278 KB) |  | HTML iconHTML  

    Most mobile phones have embedded 3D graphics engines that are not compatible with one another. This paper suggests a method for the implementation of a lightweight, compatible three dimensional graphics engine for all mobile phones. Constraints for 3D graphics on mobile phones are evaluated and analyzed. Based on this analysis, a basic, lightweight graphics engine and library, similar in concept to OpenGL and independent of any given mobile phone hardware, are developed using the Java programming language and implemented with a lower end mobile phone model series, the 503i by NTT, as the test case. View full abstract»

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  • A computational efficient SLAM algorithm based on logarithmic-map partitioning

    Publication Year: 2004 , Page(s): 1041 - 1046 vol.2
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (703 KB) |  | HTML iconHTML  

    Simultaneous localization and map building (SLAM) is a fundamental and complex problem in mobile robot research. In SLAM, Kalman-filter-like implementations are widely adopted to localize a mobile robot and build a map simultaneously and incrementally. However, this approach requires extensive computations of order O(N2), where N is the total number of landmarks. To make the computations more manageable, we propose a logarithmic map partitioning algorithm that partitions the global map into one local region and several sub-maps. The size of each sub-map is based on its distance from the mobile robot, and in each sub-map, a centroid landmark is selected to represent all the landmarks in the sub-map for SLAM computations. With this logarithmic-map partitioning, it maintains correlation updates with each sub-map and provides an efficient suboptimal solution to the SLAM problem. The number of landmarks reduces from N to a logarithm-based function of N, and the computational requirement reduces from O(N3) to O(N2), where NL is the number of local landmarks. Furthermore, utilizing the compressed extended Kalman filter, the real-time computational complexity reduces to O(NL2). Computer simulation results showed that the proposed algorithm is consistent and efficient for a large number of landmarks. View full abstract»

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  • Combined searching of Web and OAI digital library resources

    Publication Year: 2004 , Page(s): 343 - 344
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (235 KB)  

    We describe an experiment in combined searching of Web pages and digital library resources, exposed via an open archives metadata provider and Web gateway service. We utilize only free/open source software components for our investigation, in order to demonstrate feasibility of deployment for all institutions. View full abstract»

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  • Integration of Web-based techniques and business strategies into the development of a network supported system for supplier selection

    Publication Year: 2004 , Page(s): 599 - 604 Vol.2
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (797 KB) |  | HTML iconHTML  

    Supplier selection plays a vital role in the process of product development. The purpose of this research is to integrate Web-based technologies with business theories to establish a network supported system for supplier selection. A Web-based multi-possibility supplier selection system has been developed, which helps manufacturers to make decisions for selecting supplier more effectively and accurately. The business theories and analytic hierarchy process approach have been applied in combination with Java technology in the system. The problems that exist in supplier selection are addressed first, followed by the presentation of the methodologies employed in this research, and then the structure and main feature of the system are described together with an example. View full abstract»

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  • An multi-agent approach to protection relay coordination with distributed generators in industrial power distribution system

    Publication Year: 2005 , Page(s): 830 - 836 Vol. 2
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (622 KB) |  | HTML iconHTML  

    This paper presents new explorations into the use of agent technology applied to protection coordination of power systems. The impact of distributed generators on protection coordination is firstly discussed. Then a coordination multi-agent system is proposed with the functions of the agents described. In the proposed system, communication plays an important role to provide more information for the relay coordination besides the relay settings. Communication simulation has been carried out on the Java agent development framework (JADE) platform. The information communication process shows that adaptive coordination can be achieved. View full abstract»

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  • TEC storm on November 6, 2001, derived from dense GPS receiver network and ionosonde chain over Japan

    Publication Year: 2004 , Page(s): 359 - 362
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1890 KB) |  | HTML iconHTML  

    Ionospheric disturbances during a magnetic storm on November 6, 2001 were analyzed using total electron content (TEC) calculated from measurements made with a dense GPS receiver network, GEONET, which covers the whole of Japan and F-layer peak parameters obtained by a meridional ionosonde chain. Maps of TEC as a function of latitude and time were compared with NmF2 and hpF2. A weak to moderate ionospheric positive storm in terms of foF2 was associated with the magnetic storm. On the other hand, TEC was nearly doubled at all latitudes during the daytime. The significant difference in storm signatures between NmF2 and TEC was interpreted as increased upward plasma diffusion, which worked as a sink for the plasma at the F layer peak. The increase in TEC in the plasmasphere, however, was the order of 10 TEC units, which is insufficient to cause the large observed TEC enhancement but was responsible for maintaining the nighttime TEC enhancement. On the bottom side, the plasma-distribution departed significantly from the photo-chemical equilibrium due to the upwelling, and the photo-chemical production tended to adjust it, providing the major source of the great increase in TEC. View full abstract»

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  • The Back Story: He Delivers

    Publication Year: 2005 , Page(s): 7
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  • Integrating power quality sensors in a wireless network

    Publication Year: 2004 , Page(s): 153 - 157 vol.1
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (264 KB) |  | HTML iconHTML  

    Due to the present continuous development of more and more power efficient electronic devices, a comprehensive analysis of the power quality within an energy distribution area is a difficult task. Since filtering and compensation devices for power factor are no longer a solution, the continuous monitoring and control of power quality for each device in an energy distribution network becomes mandatory. A better solution is to integrate power quality sensors in each electronic device and to implement a control solution for continuous network surveillance. The large number of electronics devices targeted for power quality surveillance usually raises the problem of integrating the sensors in a control network. The paper presents a model of a power quality control system consisting of a distributed network of sensors integrated in a wireless network in order to reduce wire harnesses and to implement a fast communication link with each sensor or controller device. The main challenges of such a design along with its benefits are detailed. The proposed system allows a better energy control along with efficient communication architecture, increasing the power quality "awareness" of the energy distribution network. View full abstract»

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  • Designing human-robot interaction via physical world objects

    Publication Year: 2005 , Page(s): 155 - 159
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (271 KB) |  | HTML iconHTML  

    This paper proposes a new communication model based on physical world objects. In usual human-robot interaction a human looks on the robot's behaviors without responding to them and seldom immerses him/herself in the interaction. The communication model achieves human's immersion in interaction with two types of behaviors. The first draws human's attention to a physical world object or a physical world state. The second stimulates a human's feeling under the attention. The novel idea of the model is to employ the actual physical objects to mediate the human-robot interaction. In particular, since the second behavior relates directly to a sort of human's sensory perception, it is easy for a human to become aware of the referent of the robot's behavior. As a result of the two behaviors, he/she begins to infer robot's intentions and immerses him/herself in the interaction. View full abstract»

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  • Hardware implementation of a new adaptive 1D wavelet coding algorithm

    Publication Year: 2004 , Page(s): 681 - 685
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1039 KB) |  | HTML iconHTML  

    First Page of the Article
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  • Urban growth of Hefei, Anhui, east China, using multitemporal satellite data

    Publication Year: 2005 , Page(s): 1507 - 1510
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (182 KB) |  | HTML iconHTML  

    First Page of the Article
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  • Nanocantilevers with integrated CMOS: effects of electron beam lithography on NMOS transistors

    Publication Year: 2005 , Page(s): 213 - 216
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (180 KB) |  | HTML iconHTML  

    The effect of electron beam lithography for patterning to the nanoscale a polysilicon layer electrically connected to the gate of an NMOS transistor is studied. Different acceleration voltages ranging from 4 to 35 kV have been considered. The effect has been evaluated by measuring the transistor electrical characteristics before and after electron beam exposure. The obtained results indicate that when processing at high acceleration voltages a severe degradation of the transistor characteristics is caused that would lead to the loss of circuit performance when using this technology for the fabrication of nanocantilevers with integrated CMOS. View full abstract»

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  • Cellular multimedia network management by optimizing efficiency, QoS level and capacity

    Publication Year: 2004 , Page(s): 99 - 104
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (468 KB) |  | HTML iconHTML  

    Growth in the usage of mobile Internet services has complicated quality of service (QoS) management in cellular multimedia networks due to four objectives: maximum system efficiency in bandwidth utilization; enhanced user-perceived QoS level in terms of system protection ratio; maximum system capacity for accommodating ever increasing traffic load; least handoff rate because every handoff interrupts the negotiated QoS parameters and thus affects the application performance to an extent that depends on the period of induced interruption and type of application. Considering a GSM 900 based cellular multimedia network model, the dependency of system efficiency on the diversity of multimedia calls and handoff rate is first established; then, having determined an optimized value of protection ratio, it is established that, regardless of protection ratio value, the system's capacity depends upon the employed MAC (medium access control) protocol and handoff rate. Having confirmed numerical results by using LABVIEW 6.0 simulation software, it is concluded that, for any desired QoS level, the cellular multimedia network management requires intelligent optimization of the system efficiency and the system capacity that also depends on the employed MAC protocol and handoff rate. View full abstract»

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  • The impact of inter-/intra-functional technological learning on new product development outcomes

    Publication Year: 2004 , Page(s): 1023 - 1027 Vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (665 KB) |  | HTML iconHTML  

    This research is part of a larger study of 105 project teams from 9 electrical and electronics' multinational companies in Malaysia. It assesses the extent and effectiveness of inter-/intra-functional technological learning (i.e. comprising knowledge acquisition, information distribution, information interpretation and organizational memory) that occurs within and between new product development project teams/functional groups. Additionally, it investigates the impact of the above four processes on the new product development outcomes (i.e. project success, development speed and product entry timeliness). With the exception of organizational memory, knowledge acquisition, information distribution and information interpretation jointly exert positive influence on project success. Knowledge acquisition and information distribution were found to significantly impact development speed, unlike information interpretation and organizational memory. Knowledge acquisition had a positive impact on product entry timeliness. View full abstract»

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  • Economy-class ion-defying ICs in orbit

    Publication Year: 1998 , Page(s): 36 - 41
    Cited by:  Papers (6)  |  Patents (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2536 KB)  

    Space can be hostile in the extreme to the electronics in the hundreds of satellites now being readied for launch into low orbit. This paper describes how, now more than ever, satellite designers need an economical method of protecting their circuits from permanent damage and transient failure caused by the radiation belts that surround the Earth. View full abstract»

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  • Equalization of 10 GbE multimode fiber links

    Publication Year: 2003 , Page(s): 169 - 170 vol.1
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (236 KB) |  | HTML iconHTML  

    This study reports the use of electrical equalization strategies on 10-Gb/s MMF links. Specifically, the use of feed-forward equalization and decision feedback equalization (DFE) methods, to reduce ISI and thereby extend the reach of 10 GbE. Due to the complex behavior of MMF, measured impulse responses are used for a number of fibers. This study demonstrates that 300 m reach is possible for 500 MHz-km fiber, nearly quadrupling the 10 gigabit Ethernet (10 GbE) standard. View full abstract»

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  • The implementation of a proactive wireless intrusion detection system

    Publication Year: 2004 , Page(s): 581 - 586
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3682 KB)  

    WLAN is susceptible to attacks due to the use of radio frequency which incurs data exposure. Though IEEE defined WEP as an enhancement to security, it is recently proved vulnerable in that the keys can be speculated. With the primary protection becomes void, there is a pressing need for alternative security measures. This research devised an innovative solution by developing a proactive wireless intrusion detection system (WIDS) by utilizing short message service (SMS) and proactive techniques. The proposed WIDS is capable of preventing common wireless attacks such as WEP cracking, MAC address spoofing and war-driving. View full abstract»

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