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2nd IEEE International Conference on Data engineering, COMPDEC 1986

作者： Elmagarmid, Ahmed K. Sheth, Amit P. Liu, Hing T. Computer Engineering Program Department of Electrical Engineering Penn. State Univ. United States Honeywell Computer Science Center Golden ValleyMN United States Department of Computer and Information Science Ohio State University United States

In this paper, a centralized deadlock detection algorithm with multiple outstanding requests (CDDMOR) is proposed for use in distributed database systems and transaction-processing systems. This algorithm allows a process to request many resources simultaneously. While a centralized scheme is superior to a completely distributed scheme in terms of performance, a major problem of such a scheme is congestion. Therefore, an important extension to the basic CDDMOR, a partially distributed scheme, is proposed to alleviate the problem of congestion, as well as to take advantage of the result presented by several researchers that global (multisite) deadlocks are infrequent. It takes care of the local (single site) deadlocks without involving other sites and uses centralized deadlock detection only when there is a possibility of global deadlock. © 1986 IEEE.

关键词： Distributed database systems

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Deadlock detection algorithms in distributed database systems

Deadlock detection algorithms in distributed database system...

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International Conference on Data engineering

作者： Ahmed K. Elmagarmid Amit P. Sheth Hing T. Liu Computer Engineering Program Department of Electrical Engineering Penn. State Univ. Honeywell Computer Science Center Golden Valley MN Computer Engineering Program Department of Electrical Engineering Penn. State Univ Department of Computer & Information Science The Ohio State University

关键词： System recovery Detection algorithms Resource management Database systems computers Image edge detection

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A user-oriented reliability modelling approach for web systems

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International Journal of Web engineering and Technology 2007年第3期3卷 288-306页

作者： Wang, Wen-Li Hemminger, Thomas L. Tang, Mei-Huei School of Engineering Behrend College Erie Penn. State University Erie PA 16563 United States Computer and Information Science Department Gannon University Erie PA 16541 United States Programme of Electrical Computer and Software Engineering Pennsylvania State University Behrend College United States Pennsylvania State University Behrend College United States Computer and Information Science Department Gannon University United States

In this paper, we describe a user-oriented reliability model that addresses extensive web content, including many links, and that simultaneously addresses user dynamic navigation behaviour. Computation time is a problem in web systems because content can be tightly coupled. An alternative approach is to skip the consideration of the actual dynamic relationships but this is undesirable because the quality of a web system is bound to the success of a series of user navigations. These issues motivate our study from a user perspective. By parsing the logs, past navigations can be restored to form a flow graph. Our model adopts the idea of cyclomatic complexity to convert the graph to a maximum number of independent paths so that reliability can be computed by discounting the probabilities of unreliable paths. The application of this model can prioritise the fault removal sequence to assist in resource and effort allocation to improve reliability. Copyright © 2007 Inderscience Enterprises Ltd.

关键词： Web services

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Applying systems thinking for realizing the mission of technology-based social ventures in Africa

Applying systems thinking for realizing the mission of techn...

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2010 ASEE Annual Conference and Exposition

作者： Stepler, Renee Garguilo, Steve Mehta, Khanjan Bilen, Sven College of Information Sciences and Technology Penn State University United States Information Technology Leadership Development Program Johnson and Johnson Inc. United States Electronic and Computer Services Department College of Engineering Penn State United States Department of Engineering Design Electrical Engineering and Aerospace Engineering School of Engineering Design Technology and Professional Programs Penn State United States

There are many university initiatives that focus on technology-based solutions to address the needs of marginalized communities. The technology-based solutions are intended to be economically and socially sustainable. These endeavors are usually well-meaning, creatively designed, and enthusiastically deployed, but do not achieve the sustainable impact envisioned at the outset of the projects. To addresses these shortcomings, at The penn.ylvania state university we are applying three key tenets of systems thinking to our humanitarian engineering and social entrepreneurial ventures: 1) employing regulation via feedback to ensure that the system is actually working;2) defining systems by their interactions and their parts;and 3) understanding that systems exhibit multi-finality. The concept of multi-finality refers to (designing) a system where the individual actors (inputs), the subsystems, and their interactions, all meet their own goals while the system as a whole also meets its goals. In this paper, we lay the framework for the application of specific systems thinking concepts to increase the probability of success of global development ventures. We provide simple yet compelling examples from two different ventures to illustrate the power of systems thinking to train innovative problem-solvers and increase the probability of success of technology-based social entrepreneurial ventures in Africa. © American Society for engineering Education, 2010.

关键词： Systems thinking

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A Transparent Ultrasound Array for Real-Time Optical,Ultrasound,and Photoacoustic Imaging

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Biomedical engineering Frontiers 2022年第1期3卷 284-297页

作者： Haoyang Chen Sumit Agrawal Mohamed Osman Josiah Minotto Shubham Mirg Jinyun Liu Ajay Dangi Quyen Tran Thomas Jackson Sri-Rajasekhar Kothapalli Department of Biomedical Engineering The Pennsylvania State UniversityUniversity ParkPA 16802USA School of Electrical Engineering and Computer Science The Pennsylvania State UniversityUniversity ParkPA 16802USA Penn State Cancer Institute The Pennsylvania State UniversityHersheyPA 17033USA Graduate Program in Acoustics The Pennsylvania State UniversityUniversity ParkPA 16802USA

Objective and Impact *** imaging of ultrasound and optical contrasts can help map structural,functional,and molecular biomarkers inside living subjects with high spatial *** is a need to develop a platform to facilitate this multimodal imaging capability to improve diagnostic sensitivity and ***,combining ultrasound,photoacoustic,and optical imaging modalities is challenging because conventional ultrasound transducer arrays are optically *** a result,complex geometries are used to coalign both optical and ultrasound waves in the same field of *** elegant solution is to make the ultrasound transducer transparent to ***,we demonstrate a novel transparent ultrasound transducer(TUT)linear array fabricated using a transparent lithium niobate piezoelectric material for real-time multimodal *** TUT-array consists of 64 elements and centered at~6 MHz *** demonstrate a quad-mode ultrasound,Doppler ultrasound,photoacoustic,and fluorescence imaging in real-time using the TUT-array directly coupled to the tissue mimicking *** TUT-array successfully showed a multimodal imaging capability and has potential applications in diagnosing cancer,neurological,and vascular diseases,including image-guided endoscopy and wearable imaging.

关键词： Ultrasound specificity transparent

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Estimating symmetric, positive definite matrices in robotic control

Estimating symmetric, positive definite matrices in robotic ...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Yixin Chen J.E. McInroy Department of Computer Science and Engineering Penn. State University PA USA Department of Electrical Engineering University of Wurzburg Laramie WY USA

In a number of contexts relevant to control problems, including estimation of robot dynamics, covariance, and smart structure mass and stiffness matrices, we need to solve an over-determined set of linear equations AX /spl ap/ B with the constraint that the matrix X be symmetric and positive definite. In the classical least squares method, the measurements of A are assumed to be free of error. Hence, all errors are confined to B. Thus, the "optimal" solution is given by minimizing /spl par/AX - B/spl par//sub F//sup 2/. However, this assumption is often impractical. Sampling errors, modeling errors, and, sometimes, human errors bring inaccuracies to A as well. We introduce a different optimization criterion, based on area, which takes the errors in both A and B into consideration. The analytic expression of the global optimizer is derived. The algorithm is applied to identify the joint space mass-inertia matrix of a Gough-Stewart platform. Experimental results indicate that the new approach is practical, and improves performance.

关键词： Symmetric matrices Robot control Covariance matrix Weight control Intelligent robots Intelligent structures Equations Least squares methods Sampling methods Humans

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Reduced-order model-based feedback controller design for subsonic cavity flows

Reduced-order model-based feedback controller design for sub...

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43rd AIAA Aerospace Sciences Meeting and Exhibit

作者： Yuan, X. Caraballo, E. Yan, P. Özbay, H. Serrani, A. DeBonis, J. Myatt, J.H. Samimy, M. Collaborative Center of Control Science Ohio State University United States Department of Electrical and Computer Engineering Department of Mechanical Engineering United States Bilkent Univ. Dept. of Electrical and Electronics Eng. Ankara Turkey NASA Glenn's Quiet Aircraft Technology Program United States Air Force Research Laboratory Air Vehicles Directorate WPAFB United States

This paper explores feedback controller design for cavity flows based on reduced-order models derived using Proper Orthogonal Decomposition (POD) along with Galerkin projection method. Our preliminary analysis shows that the equilibrium of the POD model is unstable and a static output feedback controller cannot stabilize it. We develop Linear Quadratic (LQ) optimal state feedback controllers and LQ optimal observers for the linearized models. The linear controllers and observers are applied to the nonlinear system using simulations. The controller robustness is numerically tested with respect to different POD models generated at different forcing frequencies. An estimation for the region of attraction of the linear controllers is also provided.

关键词： Subsonic flow

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Relative Cost of Fault-Tolerant Transmission for Connecting Distributed Resources

Relative Cost of Fault-Tolerant Transmission for Connecting ...

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IEEE PES Transmission and Distribution Conference and Exposition

作者： R. S. Weissbach W. L. Wang C. S. Coulston M. H. Tang Electrical and Computer Engineering Technology Program Penn State Erie The Behrend College Electrical Computer and Software Engineering Program Penn State Erie The Behrend College Electrical Computer and Software Engineering ProgramPenn State Erie The Behrend College Computer and Information Science Department Gannon University

ISBN: (纸本)9781424465460

There exists a need for additional transmission capacity to connect distributed resources such as wind energy from remote locations to the power grid. The high cost of running transmission lines necessitates having a way to minimize the length of transmission required to connect the distributed resources to load centers. In addition, the substations that connect to the transmission lines need to be fault tolerant by ensuring that the loss of any one transmission line does not result in the loss of power to any substation. In this paper, the relative cost of connecting a range of sources to a range of loads with and without fault tolerance is presented. Fault tolerance is achieved through a 2-path redundant graph approach. Studies show that the additional cost of ensuring fault tolerance for selected schemes ranges between 8% and 33%. This percentage value can support decision making in practice.

关键词： Fault tolerance Optimization Transmission Two-Path Redundancy

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Digital library 2.0 for educational resources

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Lecture Notes in computer Science

作者： Akbar, Monika Fan, Weiguo Shaffer, Clifford A. Chen, Yinlin Cassel, Lillian Delcambre, Lois Garcia, Daniel D. Hislop, Gregory W. Shipman, Frank Furuta, Richard Carpenter II, B. Stephen Hsieh, Haowei Siegfried, Bob Fox, Edward A. Department of Computer Science Virginia Tech. Blacksburg VA United States Department of Computing Sciences Villanova University Villanova PA United States Department of Computer Science Portland State University Portland OR United States Electrical Engineering and Computer Science UC Berkeley Berkeley CA United States Department of Computer Science Drexel University Philadelphia PA United States Department of Computer Science Texas A and M College Station TX United States Art Education Program Pennsylvania State University State College PA United States School of Library and Information Science Univ. of Iowa Iowa City IA United States

ISBN: (纸本)9783642244681

We report on focus group feedback regarding the services provided by existing education-related Digital Libraries (DL). Participants provided insight into how they seek educational resources online, and what they perceive to be the shortcomings of existing educational DLs. Along with useful content, social interactions were viewed as important supplements for educational DLs. Such interactions lead to both an online community and new forms of content such as reviews and ratings. Based on our analysis of the focus group feedback, we propose DL 2.0, the next generation of digital library, which integrates social knowledge with DL content. © 2011 Springer-Verlag.

关键词： Digital libraries

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Quasi-Nondestructive Read Out of Ferroelectric Capacitor Polarization by Exploiting a 2TnC Cell to Relax the Endurance Requirement

TechRxiv

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TechRxiv 2023年

作者： Xiao, Yi Deng, Shan Zhao, Zijian Faris, Zubair Xu, Yixin Huang, Tzu-Jung Narayanan, Vijaykrishnan Ni, Kai Microsystems Engineering Ph.D. program Rochester Institute of Technology RochesterNY14623 United States Department of Computer Science and Engineering Penn State University University ParkPA16802 United States Department of Electrical and Microelectronic Engineering Rochester Institute of Technology RochesterNY14623 United States

In this work, we propose a 2TnC ferroelectric random access memory (FeRAM) cell design to realize the quasi-nondestructive readout (QNRO) of ferroelectric polarization (PFE) in a capacitor, which can relax the endurance requirement of the ferroelectric thin film and exploits the benefits of both FeRAM and ferroelectric FET (FeFET). We demonstrate that: i) QNRO sensing of PFE is conducted successfully in experiment with a ON/OFF ratio (ION/IOFF)>103, ION>10 µA, and read endurance>106 cycles, which can relax the FeRAM endurance requirement by 106x;ii) optimization of the cell performance can be realized by tuning the metal-ferroelectric-metal capacitor (MFM) capacitor to read transistor area ratio and read transistor threshold voltage (VTH);iii) the proposed cell structure is 3D-compatible, enabling integration of highly dense memory solution;iv) the proposed cell structure also enables compute-in-memory (CIM) applications of FeRAM, which has not been widely explored. With this technology, storage and memory-centric computing can be enabled. © 2023, CC BY.

关键词： Cytology

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