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检索条件"主题词=Programmable Logic Arrays"

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The optimal vibrational shear stress for bovine endothelial cell proliferation

The optimal vibrational shear stress for bovine endothelial ...

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IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS)

作者： Ching-Wen Li Jau-Liang Chen Chia-Ching Wu Gou-Jen Wang Department of Mechanical Engineering National Chung Hsing University Taichung Taiwan Department of Cell Biology and Anatomy National Cheng Kung University Taiwan Graduate Institute of Biomedical Engineering National Chung Hsing University Taichung Taiwan

In this study, a novel method for quantitative analysis of the optimal shear stress for better cell growth using a micro-positioning piezoelectric lead zirconate titanate (PZT) stage is proposed. Compared with the conventional fluidic sheer stress, a micro- positioning PZT stage not only provides cultured cells with laminar flow, but also is able to generate large shear stress gradient by precise reciprocating motions. Bovine endothelial cells (BEC) are than cultured on different scaffolds for investigation of cell proliferation under different vibrational excitations by a PZT stage. The fluorescence labeling is adopted to estimate the adhesive area of a cultured cell. It is observed that cells cultured on different artificial scaffolds adjusted their adhesion area to respond to the shear stress induced stimulus. Optimal growth curves for BECs on different scaffolds are drawn. The optimal shear stress for the proliferation of BECs on different scaffolds is found to be closely identical. It is suggested that a micro-positioning PZT stage may be a more cost and time effective solution than the nanostructured scaffold approach for the enhancement of cell growth.

关键词： programmable logic arrays Three dimensional displays Nanoelectromechanical systems TV Biology

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Time Series Clustering Based on I-k-Means and Multi-Resolution PLA Transform

Time Series Clustering Based on I-k-Means and Multi-Resoluti...

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IEEE International Conference on Research, Innovation and Vision for the Future

作者： Vuong Ba Thinh Duong Tuan Anh Faculty of Computer Science and Engineering Ho Chi Minh City University of Technology Vietnam

In this paper, we introduce an approach using I-k-Means algorithm combined with kd-tree for clustering of time series data transformed by the multiresolution dimensionality reduction method, MPLA. Taking advantage of the multiresolution property of MPLA representation, we can use an anytime clustering algorithm such as the I-k-Means, a popular partitioning clustering algorithm for time series. Our approach also uses kd-tree to resolve the dilemma associated with the choices of initial centroids and significantly improve the execution time and clustering quality. Our experiments show that our approach performs better than k-means and classical I-k-Means in terms of clustering quality and running time.

关键词： Time series analysis Clustering algorithms Piecewise linear approximation Linear approximation programmable logic arrays Partitioning algorithms

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Effect of PEG on impact strength of PLA hybrid biocomposite

Effect of PEG on impact strength of PLA hybrid biocomposite

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IEEE Symposium on Business, Engineering and Industrial Applications (ISBEIA)

作者： H. Anuar H. Noor Azlina A. B. K. Suzana M. R. Kaiser N. N. Bonnia S. N. Surip S. B. Abd Razak Departrnent of Manufacturing and Materials Engineering International Islamic University Malaysia Kuala Lumpur Malaysia International Islamic University Malaysia Kuala Lumpur Wilayah Persekutuan MY Metal Ceramic and Composite Group Department of Biocomposite Universiti Teknologi Mara Shah Alam Selangor Malaysia Malaysian Rubber Board Kuala Lumpur Wilayah Persekutuan MY

This paper investigates the impact strength of plasticized polylactic acid (PLA) filled with kenaf fiber (KF) and montmorrilonite (MMT). The compositional ratio of PLA, KF and MMT is 77:20:3. Hybrid biocomposite was prepared through extrusion process and then injection moulded. PLA is one of the biodegradable polymers that have poor impact properties. Therefore, to overcome this problem, 3 wt% polyethylene glycol (PEG) was added as a plasticizer in the processing of hybrid biocomposite. From the Charpy impact test, impact strength of plasticized biocomposite improved significantly as compared to unplasticized biocomposite. The impact strength of various composition of biocomposite increased with the presence of PEG, and p-PLA-KF-MMT posses the highest impact strength which is 89.5 kJ/m 2 . Transmission electron micrograph (TEM) of hybrid biocomposite revealed the well-distributed of MMT with intercalated structure.

关键词： programmable logic arrays Plastics Temperature Glass Natural fibers Dispersion

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Analysis on decoupling capacitor placement associated with power and return plane bounce

Analysis on decoupling capacitor placement associated with p...

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Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

作者： Mark I. Montrose Montrose Compliance Services Inc. USA

Decoupling capacitors minimize both power and return plane bounce developed in power distribution networks when digital components transition logic states. State changes causes significant current spikes in the power and image rails at every edge time and are sometimes called “ground bounce” or “shoot-through” potentials. If there is insufficient energy storage for both the power and return pins, plane bounce will occur. Which plane bounces depends on system and printed circuit board design and layout, particularly in regard to the location of the signal via escape anti-pads compared to the position of the decoupling capacitors. If plane bounce exceeds voltage tolerance margins, functional operation is not ensured resulting in signal integrity problems as well as development of common-mode electromagnetic interference (EMI). We investigate the magnitude of plane bounce at different locations with multiple components switching simultaneously, both with and without decoupling capacitors.

关键词： Electromagnetic interference Capacitors Switches Image edge detection Pins Capacitance programmable logic arrays

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Conductive layer deposition and peel tests on biodegradable printed circuit boards

Conductive layer deposition and peel tests on biodegradable ...

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International Symposium for Design and Technology of Electronics Packages (SIITME)

作者： Attila Géczy Márk Kovács István Hajdu Department of Electronics Technology Budapest University of Technology and Economics Budapest Hungary

Biodegradable plastics are novel materials which can be degraded by organic methods. The aim of the work was to investigate the usability of a cellulose-acetate (CA) and a polylactide (PLA) based material as a printed circuit board (PCB) with conductive layer peel tests. The common types of conductive layer coating processes were proposed: copper foil lamination, copper electroplating and thick film conductive layer deposition. The paper focuses solely of copper foil lamination. The laminates were examined by optical microscopy. The copper layer peel tests were mainly used to determine the bonding strength of the conductive layer, according to the instructions of IPC-TM-650 standard. Future investigations will involve application and test of the other conductive layer deposition processes, also the possible soldering methods, and thermal stability of the biodegradable PCBs.

关键词： Copper programmable logic arrays Polymers ISO standards Substrates

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Engineering a biomimetic villus array for in vitro 3-dimensional culture of intestinal epithelial cells

Engineering a biomimetic villus array for in vitro 3-dimensi...

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IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS)

作者： Y. Chen W. Yang Y. Huang C. Fu Ya. Fu S. Tang Institute of Nano Engineering and Microsystems Department of Power Mechanical Engineering National Tsing Hua University Hsinchu Taiwan Department of Chemical Engineering National Tsing Hua University Hsinchu Taiwan

Small intestinal villi are projective microstructures from the mucosa that provide a large surface area for digestion and absorption. On the mucosa, intestinal epithelial cells undergo terminal differentiation in space - along the crypt-villus axis - until they slough off into the lumen. Despite this unique physiological feature, to date in vitro cultivation of the intestinal epithelial cells is routinely done at the planar tissue-culture surface. In this research, we fabricated a projective, 3-dimensional (3-D) tissue-culture environment to provide a physiologically relevant condition for establishing the enterocyte cell culture in vitro. We used the mouse small intestinal epithelium as the model and applied a microfabrication process, UV-LIGA, to generate an array of microneedles with a similar projective structure and size (height: 400μm, base: 135μm in diameter) as those of the duodenal villi. In addition, we shaped the LIGA-derived poly (lactic acid) microneedles by acetone/ethanol erosion to create a smooth tip structure for the engraftment of human Caco-2 enterocytes. The engineered villus array had a total surface area of 4.81 cm 2 per *** of planar surface, which led to a 2.48-fold increase in the cell number of enterocytes on the 3-D construct relative to that on the planar control surface. Our work presents an initial step toward constituting a physiological gut in vitro by using an engineering approach for large-scale preparation of the biomimetic small intestine.

关键词： Lithography Ethanol Embossing programmable logic arrays Intestines Visualization Physiology

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On the Proactive Design of Product-Line Architectures with Aspects: An Exploratory Study

On the Proactive Design of Product-Line Architectures with A...

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IEEE Annual International Computer Software and Applications Conference (COMPSAC)

作者： Willian N. Oizumi Antonio C. Contieri Guilherme G. Correia Thelma E. Colanzi Sandra Ferrari Itana M.S. Gimenes Edson A. Oliveira Alessandro Fabricio Garcia Paulo Cesar Masiero State University of Maringá Maringá-PR Brazil Pontifical Catholic University of Rio de Janeiro Rio de Janeiro-RJ Brazil University of Sãao Paulo Sãao Carlos-SP Brazil

A product-line architecture (PLA) entails a design reused by a family of products sharing several features. The long-term stability of a PLA largely depends on the modularization of each feature from the design outset. As many features of a product-line crosscut the PLA decomposition, their modularity and stability are often improved with aspect-orientation according to recent studies. However, the use of this technique in proactive design of PLAs is challenging and has rarely been investigated. The problem is that information about the crosscutting nature of features is limited in this case. This paper presents a first study aimed at analyzing the feasibility of deriving stable aspect-oriented PLAs through a proactive design method. Our study relies on a product line and presents an in-depth exploratory analyse. We compare the stability of aspect-oriented and alternative candidates for proactively-designed PLAs. The results indicate that it is possible to derive aspect-oriented PLAs with superior stability based on a proactive design method. In addition, it is possible to anticipate pros and cons of PLAs with aspects when the latter are incorporated at an early design stage.

关键词： programmable logic arrays Measurement Stability analysis Computer architecture Unified modeling language Business Games

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Towards understanding requirement evolution in a software product line an industrial case study

Towards understanding requirement evolution in a software pr...

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IEEE International Workshop on the Twin Peaks of Requirements and Architecture (Twin Peaks)

作者： Yijian Wu Didar Zowghi Xin Peng Wenyun Zhao School of Computer Science Fudan University Shanghai China Faculty of Engineering and Information Technology University of Technology Sydney Australia

In most software development practices, software requirements and architecture are addressed simultaneously. The architecture may grow based on a core specification of requirements, and the requirements may also be elicited incrementally as the architecture gets more and more concrete. In this paper, we present a case study on the development history of Wingsoft Examination System Product Line (WES-PL), an active, industrial software product line with a history of more than eight years. We focus on 10 member products, 51 major versions that have been delivered to customer or archived in the repository between December 2003 and May 2012, by tracing both requirement and architectural changes. We identify a requirement change classification from the viewpoint of architectural impact. We claim that software requirements are negotiated and may be guided by existing software architecture design, especially in the process of software product line development. Product strategy requirements play an important role in marketing requirement negotiation. We also find typical evidences showing that a product leader or architect has to make difficult decisions to keep a balance between marketing requirements from customer-side and software architectural design from his own side.

关键词： programmable logic arrays Computer architecture Software History Cloning Switches Graphical user interfaces

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Preparation of cross-linked biodegradable copolymers based polycarbanion of 3-arm PL(D)LA with brominated pluronic and stereocomplex mediated gelation behavior

Preparation of cross-linked biodegradable copolymers based p...

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IEEE EMBS International Conference on Information Technology Applications in Biomedicine (ITAB)

作者： Jeong A Nam Yeon Jeong Oh Abdullah-Al-Nahain Euisang Yoo Sung Young Park Department of Chemical and Biological Engineering Chungju National University Chungju-si Chungbuk Republic of Korea Korea National University of Transportation Chungju Chungcheongbuk-do KR Department of Textile Convergence of Biotechnology & Nanotechnology Korea Institute of Industrial Technology Korea

We overcome rapidly dissolution properties of Pluronic hydrogels by chemical and physical crosslinking synergistic combination of gelation characteristics with polymer thermo-sensitivity. A new class of injectable sol-gel transition hydrogel was successfully prepared using biodegradable cross-linked poly(lactide)-Pluronic copolymers (PL(D)LA-Pluronic) via polycarbanion derived from enantiomeric 3-arm PLA using brominated Pluronic. The presence of enantiomeric PLA segments enables to form intermolecular stereocomplex, resulting in temperature-responsive injectable hydrogels. In contrast to the Pluronic which exhibits the temperature-dependent sol-gel transition at a concentration of 16% (w/v) or higher, the 3-arm PL(D)LA-Pluronic cross-linked stereocomplex copolymers showed much lower critical gelation concentration (~ 10 wt%). The stereocomplex formation was examined by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). The elegant design of polymeric configurations and the suitable introduction of enantiomeric properties produced a new type of copolymer that can be widely implemented as injectable hydrogels for drug delivery systems.

关键词： programmable logic arrays Polymers

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Development and usability study of multimedia courseware for slow learners: ‘Komputer Saya’

Development and usability study of multimedia courseware for...

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International Conference on Computer & Information Science (ICCIS)

作者： Norfarhana Abdollah Wan Fatimah Wan Ahmad Emelia Akashah Patah Akhir Department of Computer and Information Sciences Universiti Teknologi Petronas Bandar Seri Iskandar Tronoh Perak Malaysia

The growth of learning courseware which exploits the use of multimedia presents an active learning environment for the slow learners. This method of learning is proven to be an effective tool to be used to educate children with learning disability. This research was carried out to develop a multimedia courseware namely “Komputer Saya”, which was specially designed for the slow learners. This courseware integrates Special Education Syllabus for Learning Disabled with the learning multimedia theme. This paper discusses the framework used for the courseware evaluation and results of the usability evaluation; efficiency, ease of learning and satisfaction attributes. The evaluation conducted was divided into two types; the first evaluation is known as user testing and the second one is heuristic evaluation. Eight slow learners from special education were selected as the participants for the first evaluation while four teachers and one parent were involved in heuristic evaluation. The results of the usability evaluation indicate that “Komputer Saya” can be used as a leaning tool for the slow learners as it meets the requirement for its usability in terms of efficiency, ease of learning and satisfaction.

关键词： Fires Atmospheric measurements Particle measurements Navigation Silicon programmable logic arrays Multimedia communication

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