检索结果-内蒙古大学图书馆

Reflectance-field-based separation of surface reflection components

Kyokai Joho Imeji Zasshi/Journal of the Institute of Image information and Television Engineers 2006年第4期60卷 609-617页

作者： Zhang, Xiaohua Kobayashi, Kiichi Saito, Suguru Nakajima, Masayuki Hiroshima Institute of Technology 2-1-1 Miyake Saeki-ku Hiroshima 731-5193 Japan NHK Engineering Services Inc. 1-10-11 Kinuta Setagaya-ku Tokyo 157-8510 Japan Tokyo Institute of Technology 2-12-1 Ookaya Meguro-ku Tokyo 152-8550 Japan Department of Computer Science Faculty of the Graduate School of Information Science and Engineering Tokyo Institute of Technology Tokyo Japan Department of Imaging Science and Engineering Tokyo Institute of Technology Yokohama Japan

Light reflected from an object to a camera is a mixture of light from specular and diffuse reflection. This has important implications for many computer vision tasks, such as image matching and understanding. Many applications, for example, digital contents production, photorealistic image synthesis, and motion analysis, may require the diffuse and specular reflection to be separated. We present an approach for separating the diffuse and specular components of object surface reflection. This approach is based on the well-known dichromatic reflection model, however it separates reflections from reflectance fields constructed for every point on a 3-D object surface. Our method can prevent having to segment image into several uniformly-colored areas. Our method can thus separate reflection from an object surface with a complicated texture. We analyzed the properties of the reflectance field constructed from original frames and showed how to separate reflection components for each 3-D point. Experiments on real scenes showed that our method was successful.

关键词： Optical variables measurement

来源：评论

学校读者我要写书评

暂无评论

Development of a virtual needle biopsy simulation system for the virtual prostate

引用

Systems and computers in Japan 2006年第1期37卷 93-104页

作者： Deguchi, Daisuke Mori, Kensaku Mekada, Yoshito Hasegawa, Jun-Ichi Toriwaki, Jun-Ichiro Noguchi, Masanori Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan School of Computer and Cognitive Sciences Chukyo University Toyota 470-0393 Japan School of Medicine Department of Urology Kurume University Kurume 830-0011 Japan Faculty of Information Science Chukyo University Graduate School of Information Science Nagoya University Leice IEEE Japanese Society of Biomedical Engineering Japanese Society of Medical Imaging Technology Japan Medical Image Engineering Society Computer-Assisted Diagnostics Society School of Life System Science and Technology IPSJ JSAI JSMEBE JAMIT CADM JSSF IEEE CS Chukyo University Nagoya University Information Processing Society Computer-Assisted Image Diagnostics Society Department of Urology Japanese Urological Association Japan Society of Clinical Oncology Japan Cancer Society Japanese Society of Endourology and ESWL European Urological Association American Urological Association

This paper discusses the virtual prostate needle biopsy system and the construction of the virtual prostate model, considering the actual distribution of prostate abnormalities. A needle biopsy simulation is performed for the constructed virtual prostate, and the actual biopsy procedure in the clinical situation is evaluated. The prostate needle biopsy is a histologic diagnosis procedure in which a sample is acquired from the prostate tissue by needle biopsy and is inspected under a microscope. In order to achieve reliable prostate needle biopsy, it is necessary to consider systematically and numerically the number of needles required, and their locations and insertion angles. For such a purpose, a system is developed in which a virtual prostate is constructed on a computer and the biopsy procedure is evaluated quantitatively by performing virtually the prostate needle biopsy. Furthermore, two different models are constructed, for the prostate with and without hypertrophy, based on the actual statistical distribution data for prostate abnormalities. Each model is partitioned into the peripheral zone and the transition zone. The constructed virtual prostate is input into the virtual needle biopsy simulation system, and three different systematic biopsy procedures actually used at clinical sites, and four different needle biopsy procedures, are experimentally evaluated. The experiments show that the insertion angle that maximizes the hit probability is not always the same as the insertion angle that maximizes cancer sample acquisition. It is evident that the proposed method can indicate a biopsy procedure which realizes a high hit probability with a small number of needles. © 2005 Wiley Periodicals, Inc.

关键词： Biopsy

来源：评论

学校读者我要写书评

暂无评论

Real-time organ motion tracking and fast image registration system for MRI-guided surgery

引用

Systems and computers in Japan 2006年第1期37卷 83-92页

作者： Tokuda, Junichi Hirano, Masaya Tsukamoto, Tetsuji Dohi, Takeyoshi Hata, Nobuhiko Graduate School of Information Science and Technology University of Tokyo Tokyo 113-8656 Japan GE Yokogawa Medical Systems Ltd. Hino 191-8503 Japan International Society for Computer-Aided Surgery Japan Society for Computer-Aided Surgery Japan Society for Magnetic Resonance in Medicine GE Yokogawa Medical Systems Ltd. Imaging Application Tech. Center MR Group R and D Laboratory Technology Center GE Yokogawa Medical Systems Ltd. Society for Magnetic Resonance in Medicine Graduate School of Information Science and Technology Society for Life Support Technology Japan Society for Organ Preservation Biology and Medicine Society for Precision Engineering Society for Medical Image Computing and Computer Assisted Intervention International Union for Physics and Engineering Sciences in Medicine JSMEBE Japan Society for Life Assistance Technology Brigham and Women's Hospital Harvard Medical School MR Therapy Program

The advantage of magnetic resonance imaging (MRI)-guided surgery, in which MR images taken during surgery are used to guide the surgery, has been recognized recently. However, there is a problem, due to long imaging time of MRI, that it is difficult to capture the respiratory organ motion. It is often a constraint that the patient must hold his or her breath, especially in the treatment of the abdominal region. Consequently, this paper proposes a method of eliminating this constraint in MRI-guided surgery by real-time monitoring of the movement of the organ involved in the surgery by means of the signal derived from MRI. Specifically, the navigator echo is extracted in imaging during surgery. The movement of the organ involved in surgery is detected on the basis of the change in the calculated projection profile, and the results are presented to the surgeon. In this study, the procedure is built into a 1.5-T clinical MRI system. The feasibility of the proposed system was examined under clinical conditions by evaluating its accuracy and delay in a phantom experiment, and also in an in vivo experiment on the liver of a volunteer. The results are reported in this paper. © 2005 Wiley Periodicals, Inc.

关键词： Motion estimation

来源：评论

学校读者我要写书评

暂无评论

A State Space Filter for Reinforcement Learning in POMIDPs - Application to a Continuous State Space

A State Space Filter for Reinforcement Learning in POMIDPs -...

引用

SICE Annual Conference

作者： Masato Nagayoshi Hajimne Murao Hisashi Tamaki Graduate School of Science and Technology Kobe University Kobe Japan Hyogo Assistive Technology Research and Design Institute Kobe Japan Faculty of Cross-Cultural Studies Kobe University Kobe Japan Department Computer and Systems Engineering Kobe University Kobe Japan

This paper presents a technique to deal with both discrete and continuous state space systems in POMDPs for reinforcement learning while keeping the state space of an agent compact. First, our computational model for MDP environments, where a concept of "state space filtering" has been introduced and constructed to make properly the state space of an agent smaller by referring to "entropy" calculated based on the state-action mapping, is extended to be applicable in POMDP environments by introducing the mechanism of utilizing effectively of history information. Then, it is possible to deal with a continuous state space as well as a discrete state space. In this, the mechanism of adjusting the amount of history information is also introduced so that the state space of an agent should be compact. Moreover, some computational experiments with a robot navigation problem with a continuous state space have been carried out. The potential and the effectiveness of the extended approach have been confirmed through these experiments

关键词： State-space methods Filters Learning History Filtering Entropy Computational modeling Orbital robotics Motion planning Control systems

来源：评论

学校读者我要写书评

暂无评论

Structural and antioxidative stabilities of liposomal nanocapsulsin membrane physicochemical properties

引用

MCB Molecular and Cellular Biomechanics 2006年第4期3卷 163-163页

作者： Nakagawa, H. Shiina, T. Kotani, M. Kotani, H. Ueno, S. Department of Biomedical Engineering Graduate School of Medicine The University of Tokyo Bunkyo-ku Tokyo 113-0033 Japan Department of Computer Science Graduate School of Systems and Information Engineering University of Tsukuba Tsukuba 305-8573 Japan Department of Electronic Engineering Faculty of Engineering Tokyo Denki University Chiyoda-ku Tokyo 101-8457 Japan

The physicochemical properties of the liposomal bilayers incorporated with coenzyme Q10 (CoQ10) were studied using 13C- and 31P- nuclear magnetic resonances (13C- and 31P-NMR). Results show that intercalated compounds such as CoQ10 are useful to control the PML carriers for suitable membrane packing and lipid peroxidation inhibitory activity. The measurements of the membrane stabilities of their liposomes in vivo are currently under way.

关键词： Biomechanics

来源：评论

学校读者我要写书评

暂无评论

Evaluation of cardiac function based on ventricular pressure-volume relationships during assistance with a rotary blood pump

Evaluation of cardiac function based on ventricular pressure...

引用

Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Daisuke Ogawa Akira Tanaka Ken-ichi Abe Paul Olegario Koichiro Kasahara Yasuyuki Shiraishi Kazumitsu Sekine Tomoyuki Yambe Shin-ichi Nitta Makoto Yoshizawa Graduate School of Engineering Tohoku University Sendai Japan Faculty of Symbiotic Systems Science Fukushima University Fukushima Japan Department of Computer Science Nihon University Koriyama-City Fukushima Japan Shinichi Nitta are with Institute of Development Aging and Cancer Tohoku University Sendai Japan Information Synergy Center Tohoku University Sendai Japan

Nowadays, a rotary blood pump can be used as not only for a bridge to transplantation (BTT) but also for a bridge to recovery (BTR) and a destination therapy (DT). In such cases, evaluation of the recovery level of the native heart provides useful information to improve the clinical strategy and decide adequate timing for removing of the RBP. In contrast, the indices for cardiac function have been studied. However, most of them do not consider the assistance with the RBP. In this study, we aimed at evaluating whether E max , which is an index for cardiac function based on the pressure-volume relationships, is still valid during assistance with the RBP from an animal experiment. In the acute animal experiment with an adult goat, we measured pressure-volume (P-V) loops while cardiac function was normal, augmented or diminished. The experimental results revealed that there were typical differences in the shapes of P-V loops when the cardiac function was altered, and E max can still be used as an index for the cardiac function even if the assistance with the RBP is ongoing

关键词： Blood Heart Bridges Animals Medical treatment Timing Biomedical engineering Cities and towns USA Councils Shape

来源：评论

学校读者我要写书评

暂无评论

Meeting the information Assurance Crisis in the U.S. Now

引用

EDPACS 2006年第6期28卷 1-14页

作者： Corey Schou Deborah Frincke Charles Reynolds James Frost The Associate Dean of Information Systems Programs at Idaho State University (ISU) in Pocatello and the director of the Center for Decision Support. Currently he serves as the Chair of the National Colloquium on Information System Security Education. Schou also directs the ISU National Center of Excellence in Information Assurance Education and the ISU Technology Innovation Center. Contact Corey Schou one of the authors of this article and the Chair of the NCISSE by email at Schou@*** for help in finding additional ways to address the issues raised in this article. A member of the University of Idaho College of Engineering faculty. She graduated from the University of California at Davis. Frincke is the co-director and co-founder of the university's Center for Secure and Dependable Software (CSDS). She was the program chair for the 2nd International Workshop on Recent Advances in Intrusion Detection (RAID). A professor of Computer Science at the College of Integrated Science and Technology at James Madison University in Harrisonburg Virginia. He holds a Ph.D. in computer science from the University of Texas at Austin and a BA in philosophy from the University of Houston. Reynolds is the Director of Information System Security Education at James Madison University. Since 1997 Reynolds has led the development of the first remote Internet-based curriculum that leads to an M.S. degree in computer science with a concentration in information security. Thus far 160 students have completed this program. A professor of computer information systems at Idaho State University and the manager of its Simplot Decision Support Center.

T he only difference etween evolution and revolution is the speed at which each occurs.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Detection and Avoiding Ventricular Suction of Ventricular Assist Devices

Detection and Avoiding Ventricular Suction of Ventricular As...

引用

Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： A. Tanaka M. Yoshizawa P. Olegario D. Ogawa K. Abe T. Motomura S. Igo Y. Nose Faculty of Symbiotic System Science Fukushima University Fukushima Japan Information Synergy Center University of Tohoku Sendai Japan Graduate School of Engineering University of Tohoku Sendai Japan Department of Computer Science College of Engineering Nihon University Koriyama Japan Michael E. DeBakey Department of Surgery Baylor University College of Medicine Houston TX USA

Continuous flow blood pumps, such as axial flow and centrifugal pumps, have been gaining interest as circulatory devices for total artificial hearts (TAHs) and a biventricular assist device (BVAD) because of their smaller size and simpler structure compared to pulsatile pumps. However, continuous flow pumps are more prone to suction of the left ventricle than pulsatile pumps are. Sudden increases in flow rate to meet changes in physiological demand, especially in the left pump, often cause ventricle suction. In this study, a control algorithm to prevent suction from occurring in the left ventricle by controlling the rotational speed of the right pump, instead of reducing the cardiac output of the left pump, was developed and investigated. The method was tested in acute animal experiments with calves. The results indicate that this proposed method is capable of preventing suction and could simultaneously maintain circulatory control. A key advantage of this control system is that flow rates can be maximized while avoiding ventricle suction conditions particularly when the circulatory system is unstable such as in a the first few days after operation

关键词： Artificial heart Biomedical engineering Electronic mail Testing Animals Control systems Circulatory system Blood flow Pressure control Medical control systems

来源：评论

学校读者我要写书评

暂无评论

The interplay of public and private spaces in internet access

引用

information Communication and Society 2006年第5期9卷 633-656页

作者： Viseu, Ana Clement, Andrew Aspinall, Jane Kennedy, Tracy L. M. Department of Science and Technology Studies Cornell University Ithaca NY United States Department of Science and Technology Studies Cornell University 311 Rockefeller Hall Ithaca NY 14853 United States Faculty of Information Studies University of Toronto Information Policy Research Program Toronto Ont. Canada Collaborative Graduate Program in Knowledge Media Design Canada Information Policy Research Program Faculty of Information Studies University of Toronto Toronto Ont. M5S 3G6 140 St George St Canada Graduate Department of Sociology University of Toronto St. Catherine's Ont. M5S 2J4 725 Spadina Avenue Canada

The creation of public internet access facilities is one of the principal policy instruments adopted by governments in addressing 'digital divide' issues. The lack of plans for ongoing funding, in North America at least, suggests that this mode is regarded mainly as transitional, with private, home-based access being perceived as superior. The assumption apparently is that as domestic internet penetration rates rise, public access facilities will no longer be needed. Central to this issue are the varied characteristics of publicly provided and privately owned access sites and their implications for non-employment internet activities. What are the relative advantages and disadvantages of these two access modes? More fundamentally, how do people conceptualize public and private spaces and how does this perception influence their online activities? Finally, why do people choose one over the other, and how do they navigate between the two? This article attempts to answer these questions by drawing on data generated within the Everyday Internet Project, a 'neighborhood ethnography' of internet usage. It argues that the conventional view of private and public access facilities as immiscible, fixed alternatives is inadequate. Rather than 'pure' types, they are better understood as offering hybrid spaces whose identity and character are fluid, perceived differently by individuals in light of the activities being performed, life experiences, infrastructure and architecture. The picture emerging from our study is one where public and private access modes intertwine with each other in a variety of ways, their combination offering significant additional value for many users. From a public policy perspective, these findings suggest that if universal access is to be achieved, there is a continuing need for publicly supported broad-spectrum facilities with integrated technical support and learning opportunities, even if domestic penetration rates approach that of the telephone. ©

关键词： Digital divides Internet access and use Internet policy Neighborhood ethnography Spatial hybridity

来源：评论

学校读者我要写书评

暂无评论

A genetic algorithm for the optimization of cable routing

引用

Systems and computers in Japan 2006年第7期37卷 61-71页

作者： Ma, Xuan Iida, Kazuhiro Xie, Mengchun Nishino, Junji Odaka, Tomohiro Ogura, Hisakazu Graduate School of Engineering University of Fukui Fukui City 910-8507 Japan Wakayama National College of Technology Gobo City 644-0023 Japan Faculty of Automation and Information Engineering Xi an University of Technology B Techno College Department of Electrical and Computer Engineering Wakayama National College of Technology Information Processing Society of Japan China Mechanical Design Society Department of Systems Engineering University of Electro-Communications Japan Society for Fuzzy Theory and Intelligent Informatics Japanese Academy of Facial Studies Japan Society of Kansei Engineering Graduate Program of Nuclear Power and Energy Safety Engineering Graduate School of Engineering Fukui University IEEE CS ACM IPSJ IEICE JSMBET Department of Human and Artificial Intelligent Systems JSAI Japan SOFT IEEE

In this paper the authors propose a structural method for a genetic algorithm (GA) for the optimization problem of cable routing in which cables have to be laid optimally. When there are no limits on the layout routes, the optimal routes for the individual cables can be found using the Dijkstra method in a finite discrete graph. However, when there are limits on the capacity in the layout routes, optimization cannot be performed using the Dijkstra method. The proposed GA is a two-level hierarchical GA that uses chromosome coding involving two levels. The routes for each cable and the combinations of cable routes are defined respectively, and layout route selection is optimized overall through genetic operations involving these levels. Block crossover and block mutation are used as genetic operations in the first level. In addition, a method to take advantage of lethal genes, which do not satisfy the constraints and are generated in the second level is used. computer simulations confirm that the two-level hierarchical GA with these genetic operations functions effectively for the optimization problem of cable routing. © 2006 Wiley Periodicals, Inc.

关键词： Electric cable laying

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：