Applied Mechanics and Materials Vols. 479-480

Abstract: In this paper, we present low phase noise and low power of the voltage-controlled oscillators (VCOs) for 5 GHz applications. This chip is implemented by Taiwan Semiconductor Manufacturing Company (TSMC) standard 0.18 μm CMOS process. The designed circuit topology is included a current-reused configuration. It is adopted memory-reduced tail transistor technique. At the supply voltage 1.5 v, the measured output phase noise is-116.071 dBc/Hz at 1MHz offset frequency from the carrier frequency 5.2 GHz. The core power consumption is 3.7 mW, and tuning range of frequency is about 1.3 GHz from 4.8 to 6.1 GHz. The chip area is 826.19 × 647.83 um².

Abstract: In this study, three stage ultra-wide-band CMOS low-noise amplifier (LNA) is presented. The UWB LNA is design in 0.18μm TSMC CMOS technique. The LNA input and output return loss are both less than-10dB, and achieved 10dB of average power gain, the minimum noise figure is 6.55dB, IIP3 is about-9.5dBm. It consumes 11mW from a 1.0-V supply voltage.

Abstract: Blueweb is a self-organizing Bluetooth-based multihop network equipped with a scatternet formation algorithm and a hybrid routing protocol. The routing protocol combines the reactive method globally and the proactive method locally to discover the optimal path for packet transmission. In Blueweb, the route master maintains the global topology information and each master maintains its own N-tier routing information. In this paper, a tier number decision algorithm is used in Blueweb to determine the optimal number of tiers for all the other masters. Our computer simulation results show that this algorithm can efficiently improve the routing performance and reduce the routing maintenance cost for Blueweb routing protocol.

Abstract: This study proposes an innovative technology of Virtual COM Port Driver applied to the SaaS cloud manufacturing system, so that user can only via a web browser to complete all operations of system. Flexibility of the system extensions, and support manufacturing enterprise use other communications equipment at work, for example RFID products, GPS receiver. Information integration, solve each computer to be fitted Middleware to read native components and retrieve information for the inconvenience. This study proposes five-layer model of cloud manufacturing system, and through the virtualization web server to achieve cloud infrastructure layer. In particular, the Virtual Com Port Driver is deployed in the cloud infrastructure layer and middleware layer, and the signal device layer can communicate directly to the cloud infrastructure layer via the web browser. Through a case study, to implement the Virtual COM Port Driver technology to verify the cloud server can capture the local COM port successfully only via the web browser and integrate the information further.

Abstract: Spectrum sensing is a crucial issue in cognitive radio networks for primary user detection. Cooperative sensing based on energy detection in the cognitive radio network with multiple antennas base-station is considered in this letter. To improve the sensing performance, we investigate hybrid fusion of the observed energies from the base-station and decisions (1bit, hard information) from different cognitive radio (CR) users around the base-station. Further, we present an optimized scheme where the global detection probability can be maximized according to the Neyman-Pearson criterion. Finally the impact of the change of parameters (Signal to Noise Ratio and number of CR users) in the optimized scheme is analyzed. Numerical simulations and extensive analysis confirm that hybrid fusion base on the optimized scheme is a good choice, also, Signal to Noise Ratio (SNR) and number of CR users does not have influence on the optimized scheme

Abstract: In this paper, a smart green energy management system based on DMX512 protocol that is established by United States Institute for Theatre Technology (USITT) is proposed. The end user can monitor and control the LED lamps and electric powers according to the information received from the sensors by means of the channels of DMX512. In addition, the different color lights including red, green, and blue lights can be achieved by means of the color-mixing methods of red, green, and blue LEDs based on photometry theory. As a matter of fact, there have been attracted much attention on the mobile devices in recent years. In the study, a mobile device with an Android platform is used to control the electric power and LED lamps according to the information received from the ZigBee module immediately. However, the smart green energy management system based on DMX512 protocol has some merits, such as in real-time control, easy operation, low cost, etc.

Abstract: An innovative but low-cost mobile phone-based mechanism for e-payment, e-ticketing, and e-identity documents was proposed in an earlier article by Chan [1], who also discussed the business and technical rationales behind the innovation. Albeit it is still yet to see to what extent the mechanism will benefit the real world, it is no doubt an example of a mechanism developed with very minimal funding. In fact, the highest cost was related to its patent applications. Therefore, its development is a typical illustration of inexpensive innovation of ideas as opposed to costly experimentation and instrumentation. Specifically, this innovation, be it substantial or not, was initiated by and founded on multiple-perspective thinking, which had been popularized in educational systems and communities worldwide in recent years despite such thinking’s somewhat arcane philosophical origin. Being a qualitative, applied, industrial article instead of a piece of theoretical work, this article further elucidates the multiple-perspective model underlying the aforementioned innovation in order to exemplify the application of multiple-perspective thinking to innovation management in general. The model explores multiple perspectives as subsumed under the categories of objectives, time, locations, roles, and incidents. Further refining these categories by translating them into individual requirements of the mechanism, it ends up with what it is today. This case study underscores how multiple-perspective thinking can be leveraged as an integral and instrumental part of innovation management.

Abstract: This study is aim to evaluate the seismic response of the motor control center cabinet in a nuclear power plant using shaking table test and 3D finite element analysis method. Three typical types of motor control center cabinet were used in this study and frequency curves and spectral response acceleration were used as the indices of the dynamic response. The results indicated that the resonance frequency for X and Y direction is about 12 Hz and 15 Hz, respectively, which is verified by the numerical results. The frequencies curves and spectral response acceleration generated by numerical and experimental method were similar and well fitting. Although the numerical method obtained the conservative results, the model accurately represents the dynamic characteristics of the actual motor control center cabinet for seismic verification.

Abstract: The scaled-down model of Reinforced Concrete Containment Vessel (RCCV) for Advanced Boiling Water Reactor (ABWR) building, whose weight is 30 tons, is the biggest seismic test in Taiwan, until now. The design and stress analysis of the testing model is following the ASME-359 code. This experimental test can be the basis to check whether the scaled-down RCCV is safe or not when it undergoes the fictitious seismic loading came from shaking table. The other object of this test is getting the experimental data of dynamic responses, such as accelerations and displacements, to verify the validity of numerical model.

Abstract: Stability of tunnel portal depends on lots of factors, such as existing topography, engineering geology, hydrogeology as well as portal layout designated and stability measurements adopted, etc. Location of portals is one of the most important issues for route selection and planning stage of tunnel engineering. Thus, it is usually a mission of well-experienced engineers and also a time-consuming task. Recently, the well development of geographic information system (GIS) provides a better way to assess the slope stability of potential area for tunneling. There are great numbers of researches focusing on the evaluation on potential hazard or stability degree of existing slopes; however, the potential instability caused by possible excavation due to layout designation is seldom to be taken into account in these researches. Consequently,the present work aims to set up a GIS based method, considering the possible impacts caused by portal excavation, to quickly assess the stability of portal. First, the conventional profiles used in portals are taken into account and typical excavated slope ratios are introduced. Then, based on the digital elevation model, the potential excavated area for a location with considered elevation, said the critical wedge, can be determined accordingly. The analysis method for infinite slope is then applied to evaluation the stability of the critical wedge. Comparison with the results from slice method shows that the proposed method provides a reasonable estimation. Application to a tunnel with 6 portals, some instability occurred during construction, meets well with the situations. Using the embedded function of GIS, the safety factor then can be obtained by means of the proposed method. As various slope ratios and distinct elevation are considered, the analyzed results provide valuable information for tunnel portal selection.