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10th World Conference on Timber Engineering 2008

作者： Tsuwa, Iuko Koshihara, Mikio Fujita, Kaori Sakamoto, Isao Graduate School of Engineering University of Tokyo Tokyo Japan Institute of Industrial Science University of Tokyo Tokyo Japan Department of Architecture University of Tokyo Tokyo Japan Department of System Design Engineering Science and Technology Keio University Yokohama Japan

ISBN: (纸本)9781615670888

This paper presents the results of dynamic loading tests performed on three sizes of bracket complexes used in traditional timber structures. The aim of this research is to identify the relationship between the size of bracket complexes and their vibration characteristics. In the experiment, a horizontal load was applied with a dynamic actuator to three specimens of the same form and different sizes. The size proportions of the three specimens were 2/3:1:3/2. The stiffness of the hysteresis curve of each specimen was also evaluated by applying the Merikomi theory, the theory for calculating the theoretical stiffness of timber perpendicular to the grain. The theoretical analysis results are compared with the experimental ones for all sizes.

关键词： Stiffness

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A special case of DOAV estimation in white Gaussian noise

A special case of DOAV estimation in white Gaussian noise

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MILCOM, Military Communications Conference

作者： W. Montlouis System Architecture Design and Integration Directorate Raytheon Company Sudbury MA USA Northeastern University Boston MA USA

Estimating the location of a point source at the output of an array system can be challenging, especially when one needs to make the tradeoff between accuracy and computational complexity. Using a rectangular array, the most widely studied parameter estimation problem is the azimuth and elevation only case. Even in this two parameter case, it usually requires a two-dimensional search in order to obtain the desired information. The problem formulated in this paper is a four parameter estimation problem of significant importance. To accomplish this, the movement of the point source is modeled in a small window of observation to generate the azimuth, elevation and angular velocities. Often it is easier to develop an algorithm for the Uniformly Distributed Linear Array (ULA) case due to the well-behaved properties of this linear array structure. This paper presents a new search free approach to simultaneously estimate azimuth, elevation angles and respective angular Velocities (DOAV) of moving sources using a rectangular array of antennas.

关键词： Gaussian noise Signal processing algorithms Parameter estimation Array signal processing Azimuth Angular velocity Antenna arrays Planar arrays Monte Carlo methods Linear antenna arrays

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architecture of Timing Synchronization for MIMO-OFDM WLAN systems

Architecture of Timing Synchronization for MIMO-OFDM WLAN Sy...

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IEEE International Conference on Circuits and systems for Communications (ICCSC)

作者： Jongmin Cho Huynh Trong Anh Jinsang Kim Won-Kyung Cho Computer System Architecture & VLSI Design Laboratory Department of Electronics and Radio Engineering Kyung Hee University Yongin si Kyunggi South Korea

In this paper, we present a timing synchronization scheme of the next generation IEEE *** wireless LAN standard which is based on MIMO-OFDM technique. The proposed timing synchronization method takes two steps which consist of two modified auto-correlators. For coarse timing synchronization, a sliding window differentiator is used after a conventional auto-correlation in order to avoid plateau problem. The conjugate symmetry property of L-LTS is used for fine timing synchronization. Since cross-correlation based methods are not required, the computational complexity and the number of multiplier can be reduced. In order to reduce the hardware complexity, we have used sign comparators (SC) instead of using multipliers. Based on simulation results, the proposed method outperforms a conventional method. The proposed scheme can be applied to IEEE 802.1 In systems and can easily be expanded to frequency synchronization scheme.

关键词： Timing Wireless LAN Frequency synchronization OFDM Autocorrelation Hardware MIMO Computer architecture Very large scale integration Laboratories

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The value of modem decision-making support services to fusion projects

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FUSION ENGINEERING AND design 2007年第15-24期82卷 2713-2721页

作者： Pascal, Claude Blanchet, Christian Ollivier, Jean-Marc [a]System Architecture Department AREVA TA [b]Head of LMJ Design Integration Unit AREVA TA [c]LMJ Design Integration Unit AREVA TA

Regardless of the power generation process, whether fission or fusion, a nuclear power plant (NPP) is a complex system of thousands of components and equipment. It is also subject to stringent requirements in terms of safety, environmental impacts, schedule and cost-competitiveness. Operating experience from test and propulsion reactors recently designed and built by AREVA TA - more than 10 reactors with 4 different designs in the past 12 years - and from NPPs recently built in Asia and the AREVA NP EPR under construction at the Okiluoto site in Finland highlight the added value of the latest engineering methods. These methods meet project management standards issued in the past five years and are based on a global approach and continuous improvement of the process. They significantly minimize risk for the customer, the public and the environment. The scientific and technical complexities are significantly higher in the case of a new fusion power plant project. There is very little operating experience from previous scientific machine projects, especially in the fields of nuclear facility integration, nuclear safety culture, human factors, integrated logistics support, nuclear operations and decommissioning requirements to be factored in at the design and construction stages. Examples are provided from AREVA group experience to show the versatility of the engineering approach and present some successful adaptations of these methods in a variety of technical fields with varying levels of engineering responsibility. This paper focus on decision-making support services in the following areas: performance management, interface management (including physical as well as functional interfaces) and integration management. The contribution of CAD and PDM (Product Data Management) is discussed. This paper describes how the fusion community can benefit from the best engineering practices of nuclear companies. (C) 2007 Elsevier B.V. All rights reserved.

关键词： engineering performance interface virtual mock-up

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Exploring architectural options for a space based missile defense layer

Exploring architectural options for a space based missile de...

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AIAA Space 2007 Conference

作者： Blaha, George A. Pendergraft, Thomas C. Riley, Frederic A. Raytheon Company Integrated Defense Systems Arlington VA 22202 United States System Architecture Design and Integration Directorate Strategic Concepts and Initiatives

ISBN: (纸本)1563479079

The concept of using space-based interceptors to defend the United States and its allies from ballistic missile attack has been explored since the 1960s. Significant progress toward the deployment of such a system was made during the late 1980s and early 1990s, but development was abandoned for political reasons. Since then, the United States Missile Defense Agency has deployed an operational ballistic missile defense system consisting of land and sea-based elements capable of negating offensive ballistic missiles in their mid-course and terminal phases of flight. However, the continued growth in the number of hostile nations seeking ballistic missiles and the proliferation of missile technology has once again highlighted the need for boost-phase defense. Terrestrial boost-phase defense systems are currently under development, but the greatest potential for effective boost-phase defense lies in space, where interceptors would enjoy persistent and survivable basing close to offensive missile launch sites. This paper explores the foundations of providing a space-based layer to the United States ballistic missile defense system to complement the currently-deployed ground and sea-based elements. The architecture design problem is introduced by examining the allocation of system functions to space-based platforms, exploring architecture options, and suggesting appropriate measures of system effectiveness.

关键词： Space applications

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A system for the Measurement of the Amazon

A System for the Measurement of the Amazon

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IEEE National Conference on Radar

作者： Paul B. Ferraro Mark Bauersachs John Burns Gary Bataller Analysis and Integration Directorate (SADID) System Architecture Design Analysis and Integration Directorate (SADID) Raytheon's Integrated Defense Systems (IDS) Raytheon Company

The system for the Vigilance of the Amazon (SIVAM) is a $1.4 billion dollar project of Brazil aimed at the development and deployment of a high-technology system-of-systems to perform monitoring, protection and control of the land, air and water resources of the Brazilian Amazon region. The primary challenge of the SIVAM project is to perform remote sensing and communications over a vast and undeveloped land area. The SIVAM network meets this challenge through an extensive network of air traffic control/surveillance radars, environmental sensors, communications systems, airborne sensor systems and coordination centers. Now fully operational, the SIVAM system is the world's largest fully integrated remote monitoring system of the environment and provides critical information on a timely basis to the Brazilian government, law enforcement agencies, and to commercial, educational and research groups.

关键词： Remote monitoring Sensor systems Protection Communication system control Control systems Water resources Air traffic control Surveillance Airborne radar Radar remote sensing

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Decentralized Control using Global Optimization (DCGO)

Decentralized Control using Global Optimization (DCGO)

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2007 AIAA InfoTech at Aerospace Conference

作者： Flint, Matthew Khovanova, Tanya Curry, Michael L. BAE Systems Burlington MA 01803 United States Raytheon Company Andover MA 01810 United States Advanced Information Technologies 6 New England Executive Park Burlington MA 01803 United States AIAA United States System Architecture Design and Integration Directorate 50 Apple Hill Drive Tewksbury MA 01876 United States

ISBN: (纸本)1563478935

The coordination of a team of distributed air vehicles requires a complex optimization, balancing limited communication bandwidths, non-instantaneous planning times and network delays, while at the same time trying to allocate limited resources to spatially diverse locations in a near-optimal fashion in a dynamic and uncertain environment. Given that, in this environment, the optimality of a given plan will not last very long when the information state is constantly changing and being updated, a new approach is proposed in this paper. Global-scope plans for the team are generated and distributed using the principle of emergent leadership to provide efficient plan generation and execution with minimal performance degradation compared to a centralized controller under delayed communications. This type of protocol is labeled the Decentralized Control Global Optimization (DCGO) protocol, and is discussed in this paper, along with some simulation results showing that this premise can produce good results in a realistic environment.

关键词： Global optimization

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InterActive Cruise Control - A new driver interaction concept for Adaptive Cruise Control systems

InterActive Cruise Control - A new driver interaction concep...

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2006 SAE World Congress

作者： Mayser, Christoph Naab, Karl Kagerer, Walter BMW Group Driver Assistance and Active Safety Systems / System Development 80788 Munich Germany BMW Group System Architecture and Design / Driver Assistance Systems 80788 Munich Germany

Already established driver assistance systems like Cruise Control or Adaptive Cruise Control are based on the delegation of a part of the driving task to the system. Instead of keeping a suitable speed the driver is just monitoring the correct function of the assistance system. In situations when the system is fulfilling the task in a way the driver doesn't accept she / he has to deactivate it. Adding a new input element the driver gains the possibility to create additional inputs in terms of acceleration or deceleration to the assistance system. This allows the driver to modify the system behavior in different driving situations without deactivating the system. The relationship between driver and system shifts from "delegation" to "co-operation". This paper explains principal aspects of the technical realization and presents the results of a study regarding the first contact of subjects with an enhanced Adaptive Cruise Control. Copyright © 2006 SAE International.

关键词： Adaptive cruise control

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Study on the structural performance of traditional timber houses based on a static lateral loading test of a farmhouse in Japan

Study on the structural performance of traditional timber ho...

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9th World Conference on Timber Engineering 2006, WCTE 2006

作者： Sato, Hiromi Matsuda, Masahiro Fujita, Kaori Koshihara, Mikio Sakamoto, Isao Graduate School of Engineering Tokyo Metropolitan University Tokyo Japan Institute of Industrial Science University of Tokyo Japan Dept. of Architecture Tokyo Metropolitan University Japan Dept. of System Design Eng. Science and Technology Keio University Japan

ISBN: (纸本)9781622762859

This paper presents the results of static lateral loading test performed on a traditional timber farmhouse in Japan. The aim of this research is to understand the horizontal load carrying capacity and the failure mode of this type of house using a full-scale experiment. In the experiment, the maximum horizontal load was 45 kN. The results of this test are discussed in comparison with results of other previous research. Static analysis using a theoretical model considering the structural performance of joints and the deterioration of timber is also performed.

关键词： Timber

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Application of the refined mesh method for the strength estimation around openings

Application of the refined mesh method for the strength esti...

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作者： Lee, Kyung-Seok Song, Jae-Young Kim, Kyung Su Kim, Sung Chan Kim, Jung Hee Dept. of Structure Design DSME Okpo Geoje Kyungnam 656-714 Korea Republic of SESTEK Inha University Incheon 402-751 Korea Republic of Dept. of Naval Architecture and Ocean Engineering Inha University Incheon 402-751 Korea Republic of Dept. of Ship and Ocean System Inha Technical College Incheon 402-752 Korea Republic of

It is not easy to solve the troubles around the openings at the detail design stage, because there are a lot of concerning locations. There are not also clear design rules of classification societies. For more detailed strength analysis around holes on the longitudinal girder or transverse web below deck plate, it is also very difficult to decide the boundary condition (B.C) at both ends. Grillage analysis, which considers B.C and more detailed member arrangement, is used in simple analysis. Furthermore, refined mesh method, which use a part of member in the strength analysis, is used to decide *** around holes. Component loads are applied to a refined mesh model separately and *** according to component loading are calculated. S/F and B/M are decided from the grillage analysis and S.I.F for a given hole location is deduced from database and the results of grillage analysis.

关键词： Strength of materials

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