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  • articleNo Access

    New Design of Scan Flip-Flop to Increase Speed and Reduce Power Consumption

    In this paper, a novel low-power and high-speed pulse triggered scan flip-flop is presented, in which short circuit current is controlled. Switching activity is decreased to reduce the consumed power of the scan flip-flop. Also, the total number of transistors through the path from input to the output is reduced and so the delay of the proposed scan flip-flop is decreased. Simulation results show 12% and 29% reduction in power consumption and delay of the proposed scan flip-flop, respectively. The results are given by comparison of our work with other scan flip-flops at 50% data switching activity.

  • articleNo Access

    A Novel Method Towards Time-Efficient Fault Analysis of Analog and Mixed-Signal Circuits

    A novel method of nodal impedance calculation is presented in this paper. This method is capable of time-efficient calculation of arbitrary two-point complex impedance in an analog and mixed-signal circuit and could improve the development time of impedance-based tests both in DC and AC domain. A fault simulation methodology based on the proposed method is described in detail. Several experiments are provided that prove the time efficiency of the method. Experimental application showing the benefits of the method on a real circuit is provided as well.

  • articleNo Access

    DEFECT DETECTION FOR EXECUTABLE SPECIFICATIONS — AN EXPERIMENT

    The deployment of executable specifications has increased significantly in the last few years. Just as with any other specification documents, these specifications must be examined to ensure the necessary degree of quality. A common and successful technique used for examining traditional specifications is inspection. Now the question has arisen whether inspections on executable specification are the best choice, or if other techniques which use the execution capabilities of the models perform better.

    In this paper, we empirically compare several defect detection techniques for executable specifications. In particular, we examine inspections, testing, and ad-hoc simulation. Here, we use the specification languages Statemate and Matlab/Simulink. Also, we take a closer look at the inspection process itself and try to quantify the benefits of an inspection meeting for executable specifications.

  • articleNo Access

    THE TECHNIQUE OF BUSINESS MODEL DRIVEN ANALYSIS AND TEST DESIGN FOR DEVELOPMENT OF WEB APPLICATIONS

    A technique for creating analysis models of a web application from a business model is proposed for easy and effective development. Moreover, a technique for generating test cases from the sequence diagrams for a web application is proposed. The use case diagram and web page list are generated from the business model which is depicted using the notations of the UML (Unified Modeling Language) activity diagram. The page diagram and logical/physical database models are created based on the web page list and extracted data fields. Test cases for the web application are generated from call messages (including self-call messages) of the UML sequence diagram. The effectiveness of these techniques is shown using a practical case study which is a development project of a web application for RMS (Research material Management System).

  • articleNo Access

    Industry Watch

      Progen and Avexa Agree to Merge for Research Synergies

      Merial to Develop Vaccine Candidates Using Imugene's Vector Technology

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      The Sym006 Discovery Collaboration of Symphogen and Meiji Advanced to Preclinical Development

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      S*BIO and Tan Tock Seng Hospital to Assess New Therapeutic

      Preclinical Translational Imaging Center Opened in Singapore

      KKH Implements Rapid HIV Testing for Unbooked Pregnancies

      Singapore's Parkway Chosen to Manage Abu Dhabi Hospital

    • articleNo Access

      Bioboard

        AUSTRALIA – Minimizing Spread of Deadly Hendra Virus.

        AUSTRALIA – Breakthrough High Blood Pressure Treatment Trial Down Under.

        AUSTRALIA – Australia Sees Rise in Newborn Withdrawal Syndrome.

        CHINA – CAS, Hong Kong University Set Up Joint Lab of Natural Medicine.

        CHINA – Chinese Researchers Discover 20 Essential Genes in Polyoxin.

        CHINA – China Aims to Lead Asia's Stem Cell R&D.

        CHINA – China Rural Areas on High Alert for Hand, Foot and Mouth Disease.

        CHINA – Hepatitis Infects 64 at China Hospital.

        CHINA – China's Colorectal Cancer Drug Market will More Than Double by 2012.

        CHINA – Critical Gene for Enhancing China's Super Rice Yield Identified.

        CHINA – Chinese Scientists say New Discovery May Yield Clue to Cure Human Infertility.

        HONG KONG – Compound to Fight Bird Flu Identified.

        INDIA – Yashoda Cancer Institute Treats First Patient In India Using RapidArc Radiotherapy Technology.

        INDIA – Indian Pharma Industry May Gain $18.4 bn from Global Market.

        INDIA – Philips to Make India Hub for Medical Equipment Manufacturing.

        JAPAN – Herbal Medicines to Treat Gastrointestinal Disease.

        SINGAPORE – Tetravalent Dengue Vaccine Trial in Singapore.

        SINGAPORE – Minimally Invasive Robot-Assisted Surgeries for Heart Patients.

        SINGAPORE – US-Based Company Launches Singapore Doctor Search Site for Medical Travelers.

        SINGAPORE – Genetic Research: Time for a rethink?

        SINGAPORE – Test Kits to be Licensed.

        SINGAPORE – Local Team Develops Method to Predict Heart Disease.

        SINGAPORE – Consumer Genetic Tests – A Cause for Worry?

        SINGAPORE – S'pore Firm's Test Kit Joins the Fight.

        SINGAPORE – Singapore Gives New Hope To The Blind.

        SINGAPORE – Singapore and Korea Research Institutes Embark on Landmark Collaboration for Breakthroughs in Micro and Nanotechnology.

        SOUTH KOREA – Institute Develops Cheap Cholera Vaccine.

        TAIWAN – Herbal Substance Developed for Cardiovascular Disease.

        TAIWAN – Prototype of Household Breast Cancer Detector Unveiled.

        TAIWAN – Breakthrough in New Diabetes Drug.

      • articleNo Access

        Buckling of Spherical Grid-Shells Made of Smooth Triaxial Weaving with Naturally In-Plane Curved Ribbons

        The woven structure made of naturally curved (in-plane) ribbons has smooth geometry and fewer geometric imperfections, but there is no study of its buckling mechanical properties under vertical loads. The aim of this paper is to investigate buckling mechanical properties of spherical woven structures. Three spherical woven structures with different ribbon types and six new spherical woven structures with different ribbon widths and thicknesses were designed and the quasi-static vertical compression tests were carried out. The buckling load of spherical woven structures were studied by nonlinear finite element and ring buckling theory. Results indicate that the failure mode of the spherical weave structure under vertical loading can be divided into two stages, where a flat contact region forms between the spherical weave structure and the rigid plate and inward dimple of ribbons. Spherical weave structures using naturally curved (in-plane) ribbon weaving have better buckling stability than those woven with straight ribbon. Based on theoretical and finite element analysis, we propose a buckling load equation and buckling correction factor equation for the new spherical weave structure under vertical compression load. The formula is validated and has good agreement with the test results, which could help to design the stability of spherical weave structures with in-plane ribbons.

      • articleOpen Access

        Responsiveness of pain, functional capacity tests, and disability level in individuals with chronic nonspecific low back pain

        Background: Clinical outcomes are very important in clinical assessment, and responsiveness is a component inside the outcome measures that needs to be investigated, particularly in chronic nonspecific low back pain (CNSLBP).

        Objective: This study aimed to investigate the responsiveness of pain, functional capacity tests, and disability in individuals with CNSLBP.

        Methods: Twenty subjects were assessed in pain using the following methods: visual analog scale (VAS) and numeric pain rating scale (NPRS), functional capacity tests: functional reach test (FRT), five-time sit-to-stand test (5 TSST), and two-minute step test (2 MST), and disability level: modified Oswestry Disability Questionnaire (MODQ), Thai version before and after 2-week intervention session. For interventions, the subjects received education, spinal manipulative therapy, and individual therapeutic exercise twice a week, for a total of two weeks. The statistics analyzed were change scores, effect size (ES), and standardized response mean (SRM).

        Results: The most responsive parameter for individuals with CNSLBP was pain as measured by numeric pain rating scale (NPRS) (ES 0.986, SRM 0.928) and five-time sit-to-stand test (5 TSST) (SRM 0.846).

        Conclusion: This study found that NPRS pain and 5 TSST were responsive in individuals with CNSLBP at two weeks after the beginning of interventions.

      • articleNo Access

        Anomaly Detection Algorithm for Heterogeneous Wireless Networks Based on Cascaded Convolutional Neural Networks

        As the popularity of wireless networks deepens, the diversity of device types and hardware environments makes network data take on heterogeneous forms while the threat of malicious attacks from outside can prevent ordinary methods from mining information from abnormal data. In view of this, the research will be devoted to the feature processing of the anomalous data itself, and the convolutional operation of the anomalous information by the convolutional neural network (CNN). This is to extract the internal information. In the first step of the cascaded CNNs, the dimensions of the anomaly data will be processed, the anomaly data will be sorted under the concept of relevance grouping, and then the sorted results will be added to the convolution and pooling. The performance test uses three datasets with different feature capacities as the attack sources, and the results show a 13.22% improvement in information mining performance compared to the standard CNN. The extended CNN step will perform feature identification for homologous or similar network threats, with feature expansion within the convolutional layer first, and then pooling to reduce the computational cost. The test results show that when the maximum value domain of linear expansion is 2, the model has the best feature recognition performance, fluctuating around 85%; The model comparison test results show that the accuracy of the extended CNN is higher than that of the standard CNN, and the model stability is better than that of the back propagation (BP) neural network. This indicates that the cascaded CNN dual module can mine for the data itself, thus ignoring the risk unknowns, and this connected CNN has some practical significance. The proposed cascaded CNN module applies advanced neural network technology to identify internal and external risk data. The research content has important reference value for the security management of IoT systems.

      • chapterNo Access

        Chapter 72: Non-Parametric Inference on Risk Measures for Integrated Returns

        When evaluating the market risk of long-horizon equity returns, it is always difficult to provide a statistically sound solution due to the limitation of the sample size. To solve the problem for the value-at-risk (VaR) and the conditional tail expectation (CTE), Ho et al. (2016, 2018) introduce a general multivariate stochastic volatility return model from which asymptotic formulas for the VaR and the CTE are derived for integrated returns with the length of integration increasing to infinity. Based on the formulas, simple non-parametric estimators for the two popular risk measures of the long-horizon returns are constructed. The estimates are easy to implement and shown to be consistent and asymptotically normal. In this chapter, we further address the issue of testing the equality of the CTEs of integrated returns. Extensive finite-sample analysis and real data analysis are conducted to demonstrate the efficiency of the test statistics we propose.

      • chapterNo Access

        TEST OF DRUG RESISTANCE ON BACTERIA WITH IMPEDANCE MICROORGANISM SENSOR

        In this paper, test of drug resistance on bacteria was performed to medical clinic with impedance microorganism sensor. The impedance value of different bacterial cultures was measured using the home-made microorganism sensor and measurable setup of impedance, then all impedance values attained in the period of bacteria culture were recorded and the curve between impedance value and cultural time was drawn to judge the drug resistance of different bacteria. It was shown that the curve was obviously difference between liquid cultures that antibacterial drugs was added and cultures of normal bacteria. This method was significant for rapid detection of drug resistance, automatization and intelligentization of test of drug sensitivity in medical clinic.

      • chapterNo Access

        Rethinking and Researching Mathematics Assessment in Singapore: The Quest for a New Paradigm

        The concept and method of mathematics assessment in Singapore schools have undergone some important developments, and in a sense, a paradigm shift, over the last decades. This chapter traces the events and efforts that led to a broadening of the role of student assessment in mainstream Singapore schools and that gave rise to the use of assessment methods other than the “traditional” ones. Beginning with a brief clarification of terms such as tests, examinations, and assessment, the chapter goes on to describe a new conception of assessment and its broader role in the service of student learning. It next compares the so-called alternative and traditional assessment approaches, presents local empirical studies, and highlights critical issues in the design and use of alternative assessment. The chapter ends with some lessons learned, challenges faced, and suggestions for future research in the assessment of mathematics in schools.

      • chapterNo Access

        Design of up-converter and down-converter for S-C band

        In order to research the system of satellite communication and its new technology in the laboratory, an up-converter and down-converter for S-band is proposed in this paper. A PLL (phase locked loop) frequency synthesizer, an IF (intermediate frequency) AGC (automatic gain control) amplifier, and a coaxial cavity filter is designed based on chip ADF4113. The amplitude-frequency characteristic, phase-frequency characteristic and degree of balance for channels are measured. The measurement results are given. The spurious signal is -70 dBc over the 500 MHz band, and the phase noise is - 80dBc/Hz@1kHz. The amplitude-frequency characteristic and phase-frequency characteristic of uplink and down-link are tested, and verified the feasibility of the scheme.

      • chapterNo Access

        Approaches on Receiver Sensitivity Test of Zigbee Module

        In the IEEE Standard 802.15.4 for ZigBee, it sets the parameters of the ZigBee modules needed to be tested. One of the most important parameters is the test of the module receiver sensitivity. Although the requirements and the testing method of this specification has been given in the standard, there is still a huge difference from specification in practical. According to the result in the lab, the difference between these two values is almost 20dB. This article firstly introduces the results of sensitivity testing by using different vector signal generators, ZigBee module, spatial transmission in the laboratory environment and then analysis the experiment results. According to the analysis results, the sensitivity is then tested by spatial transmission in anechoic chamber and shielded enclosure. Based on the test mentioned above, it is proved the reason of sensitivity reducing determined previously. The research result of this article could have an improvement to the practical use of ZigBee.

      • chapterNo Access

        Gasoline engine combustion analysis system based on labview

        In order to have a depth research for the combustion process and the status of the engine emissions, it is necessary to develop a excellent combustion analysis system. The data collection, data processing, data computing and other display functions were realized by the self-developed combustion analysis system software, and some relative analyses of cylinder dynamic combustion were done. At the same time, it is so important for designers have an optimization of engine if they use the P-Φ indicator diagrams. Pmax indicator diagrams, air-fuel ratio(ξ)and fuel consumption variation data and so on. The test system for an internal engine combustion analysis through continuous testing and use, is feasible. No doubt, Better user interface and lower costs of this combustion system is pretty good for tester analysis the related data. Designers could facilitate the continuous development and utilization, so it has a certain value in engineering.

      • chapterNo Access

        Experimental Study on Truss-Column Pinned Connections in Large-Span Steel Structures

        A Truss-Column pin-connected joint used in large-span steel structures is proposed in this paper. The European code is used to analyze and design the joints. The finite element analysis is conducted on four joints by the software ABAQUS. The full-scale model of the joints, as well as the large-scale, has been tested both under monotonic and repeated loads, the ultimate loads and the hysteretic curve of the joints are obtained. The results of the test indicate that the pin-connected joints have strong working behavior. Combined with the test and the calculation, it verifies the reliability of the calculation method. The tests make perfect the theory of the pin-connected calculation. The European code is viable and can be applied to long-span steel structures in China.

      • chapterNo Access

        Research on Testing of IGBT Main Parameters

        IGBT device has been widely used in the power industry, its level of quality and reliability has important significance for the development of the industry. The single-tube IGBT was as the test object and its main static parameters, output characteristics and capacitance testing principles and methods were analyzed. The experimental data and waveform was obtained by Keysight tester. The results show effectiveness of the proposed test method. The results can provide a reference for module selection.

      • chapterNo Access

        AMENDMENT AND RECONSTRUCTION OF EMPIRICAL FORMULAS CALCULATING BURSTING PRESSURE OF SPECIAL SPHERICAL VESSELS(I)

        By using several traditional empirical formulas, the bursting pressures of a kind of special spherical vessels were calculated, a comparison between calculated and tested results was performed, and the features of errors distribution were analyzed. Based on the features of errors distribution, referring to the methods constructing traditional empirical formulas and taking the constituent characteristics of the original formulas into consideration, the traditional empirical formulas were amended and reconstructed. Moreover the amended and reconstructed formulas were validated by experimental data. The validation results indicate that the accuracy of the amended formulas is higher than that of the traditional empirical formulas and the accuracy of the reconstructed formulas is further higher than that of the amended formulas, which implies that the amended and reconstructed formulas are practically useful in design of the discussed special spherical pressure vessels, the related amendment and reconstruction methods are reasonable and can be used in researches of analogous problems. In this paper the amendment case was presented. The reconstruction case will be presented in a subsequent paper.

      • chapterNo Access

        AMENDMENT AND RECONSTRUCTION OF EMPIRICAL FORMULAS CALCULATING BURSTING PRESSURE OF SPECIAL SPHERICAL VESSELS(II)

        By using several traditional empirical formulas, the bursting pressures of a kind of special spherical vessels were calculated, a comparison between calculated and tested results was performed, and the features of errors distribution were analyzed. Based on the features of errors distribution, referring to the methods constructing traditional empirical formulas and taking the constituent characteristics of the original formulas into consideration, the traditional empirical formulas were amended and reconstructed. Moreover the amended and reconstructed formulas were validated by experimental data. The validation results indicate that the accuracy of the amended formulas is higher than that of the traditional empirical formulas and the accuracy of the reconstructed formulas is further higher than that of the amended formulas, which implies that the amended and reconstructed formulas are practically useful in design of the discussed special spherical pressure vessels, the related amendment and reconstruction methods are reasonable and can be used in researches of analogous problems. In a previous paper[1] the amendment case was presented, in this paper the reconstruction case was presented.

      • chapterNo Access

        TEST AND MEASURE ON DIFFERENCE OF ASYMMETRY BETWEEN SEVERAL SQUARE TABLES AND APPLICATION TO MEDICAL DATA

        For the analysis of square contingency tables with ordered categories, Tahata, Yamamoto, Nagatani and Tomizawa (2009) considered an average symmetry model and a measure of degree of departure from the model. The present paper proposes (1) the statistic to test the equality of degree of asymmetry and (2) the measure to represent the difference of degree of asymmetry between several square contingency tables. They are applied to unaided distance vision data in Britain and in Japan, and to decayed teeth data in Japan.