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During major metrologica! events, such as typhoons, a wind turbine will frequently cutout and re-cutin as wind speed fluctuates around the cutout speed. Repeated cutouts can undermine the reliability and the safety of a wind turbine. A dead band of wind speed between cutout and re-cutin speeds can be utilized to prevent frequent cutouts. Although a dead band of wind speed is helpful, it is not efficient...
Scientific exhibition in Taiwan has been held by National Taiwan Science Education Center for more than 55 years, more than 15,000 works has been accumulated. It also becomes a famous competition for K-12 students. In order to provide recommendation of research topic to the participating students, domain experts require the growth topic and related industry from the past works. However, with the long...
Elementary schools are considered as the important stage for the enlightenment of multiplication. The establishment of the language of multiple and multiplication concepts is the key point of students mathematical learning in this stage. Combining scaffolding with rapidly developing technologies to assist students in achieving higher-level development is the primary task for teachers. Aiming at students...
Through MOOCs and social media platforms, users can share, track, and search for the information of their specific interests. Thus, they can make interactive discussions as well as social media learning on multimedia texts and learning materials. This paper proposes a big data analysis technique on learning portfolio to explore how the interaction, unknown correlations, and hidden patterns among learners...
This study examines the optimal offshore wind farm layout for a fixed number of wind turbines and a fixed covered area. After the optimal layout of the turbines is determined, the topology of the cable connections is optimized. The wind decay that is associated with the wake effect is considered, and the CSS algorithm is utilized to obtain the optimal wind-turbine layout that maximizes the power output...
Data exchange platform is the key to get through data links and achieve information exchange. The thesis discusses a modified model of real-time data subscription/dissemination and proposed its physical architecture. Data exchange flow is analysed. A new data exchange platform is really implemented according to the modified model. Firstly, access terminal submits each application to service bus for...
This paper is concerned with the construction of local parities for optimal locally repairable codes (LRCs) with (r, t)-availability in distributed storage, where a symbol is said to have (r, t)-availability if it can be reconstructed from t disjoint repair alternatives of other symbols, each of size at most r. The key to constructing a family of optimal LRCs with (r, t)-availability that can support...
This paper has studied the effects of grating period on the sensitivity of the sub-wavelength Lamellar grating waveguide sensor with TE polarization incidence. Both of the peak wavelength shift and the full wavelength half maximum (FWHM) of the guided mode are investigated. The calculation results show that the smaller period grating layer will induce more guided modes. Comparing the spectrum sensitivity...
In this paper, we address the issue of unequal missing protection (UMP) for the design of grouping of radio-frequency identification (RFID) tags. While relying on group generation matrices, grouping of RFID tags allows verifying the integrity of a collection of RFID tags without the requirement for accessing external systems, and can be extended to identify missing RFID tags. Motivated by application...
In this paper, a Flash macro designed with high-density arrays of split-gate (SG) SuperFlash® cells, compatibly embedded in a 55 nm Low Power (LP) logic process is demonstrated with full functionality and excellent reliability at automotive temperature range. This split-gate Flash memory technology can be seamlessly and universally embedded in multiple logic process platforms, and can continually...
Birds plays an essential role in ecosystem as well as human society. This paper presented the design of a short-range, low-power monitoring radar for bird observation. By utilizing the self-injection locked radar architecture and joint frequency-time analysis, the proposed system is able to detect the wing-beat frequency (WBF) from a flying bird at distances up to 18 m. Several experiments are successfully...
Wind power development is urgently required to facilitate development of Islands in South China Sea. Meteorological data of 6 islands are investigated in this paper. Weibull distribution is utilized to assess wind power resource. Potential wind power generation of 4 small wind turbines is analyzed. The generalized Pareto distribution based Peak over threshold approach is utilized to estimate wind...
Reconfigurability in mm-wave circuits and systems become desired in recent years. In this work, the parallel-beam driven actuator is modified in two ways to enhance the tuning capability. In cooperated with the proposed actuator, two V-band frequency-tunable front-end circuits are demonstrated. The bandstop filter is fabricated in 0.35-μm CMOS-MEMS process, providing five-band switching within 51–63...
Reconfigurability in mm-wave circuits and systems become desired in recent years. In this work, the parallel-beam driven actuator is modified in two ways to enhance the tuning capability. In cooperated with the proposed actuator, two V-band frequency-tunable front-end circuits are demonstrated. The bandstop filter is fabricated in 0.35-µm CMOS-MEMS process, providing five-band switching within 51–63...
This paper proposes an efficient low-complexity polyphase interleaving and inversion (PII) scheme based on enhanced parallel tabu search (TS) for the reduction of peak-to-average power ratio (PAPR) in space-frequency block-coded orthogonal frequency-division multiplexing (SFBC-OFDM) systems. PII is a technique that can significantly reduce the PAPR of SFBC-OFDM symbols by exchanging SFBC symbols between...
Software-defined Networking (SDN) has emerged as the dominant programmable network architecture that separates the control plane from the data plane. SDN allows the network administrators and data centers to efficiently and flexibly manage their networking equipment using software that runs on external servers. SDN adopts OpenFLow protocol to communicate between network switch and controller. In this...
This paper proposes a compact Ku band TE21 mode coupler based on coaxial waveguide. This compact coupler takes only half the length of conventional circular waveguide coupler while maintains at least 55dB rejection of unwanted modes and reaches −6.3dB coupling to each of the rectangular waveguide arms in a bandwidth of 700MHz. The coupler can miniaturise the total length of monopulse system which...
The air quality monitoring has become one of the most important and critical issues as human beings are paying more and more attention to the living quality. Various countries legislate on air quality norm related to the monitoring and measurement standards of air condition. However, most of monitoring stations for air pollution are set up in outdoor and monitor sources of air pollution and global...
This paper proposes an efficient low-complexity cross-antenna rotation and inversion (CARI) scheme based on enhanced parallel tabu search (TS) for the reduction of peak-to-average power ratio (PAPR) in space-time block-coded orthogonal frequency-division multiplexing (STBC-OFDM) systems. CARI is an efficient PAPR reduction technique that fully utilizes additional degrees of freedom provided by employing...
Hadoop is enjoying popularity for processing data-intensive jobs because of its data locality feature. However, the performance gained from Hadoop's above feature is currently limited by its default block placement policy, which implicitly assumes instances of MapReduce jobs access data from a single file. On the contrary, multi-file queries like indexing query or aggregation query need to process...
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