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Electrical and Computer Engineering Commons™
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Full-Text Articles in Electrical and Computer Engineering
A Modularized Software Package For Adaptive Beamforming, Shun-Hsyung Chang, Shao-Wei Leu, Hsing-Wang Liang
A Modularized Software Package For Adaptive Beamforming, Shun-Hsyung Chang, Shao-Wei Leu, Hsing-Wang Liang
Journal of Marine Science and Technology
This paper presents a modularized simulation software package for adaptive beamforming. In recent years, the theory and technology of adaptive beamforming have been applied extensively in many different areas such as radar, sonar, communication systems, and geophysical exploration. As many new beamforming architectures and related algorithms are being introduced, researchers find themselves repeating the laborious process of writing similar software routines in order to conduct simulations. This is largely due to the lack of well-defined and modularized supporting software. Therefore, we have implemented a collection of representative algorithms available for adaptive beamforming and constructed a simulator with menu-driven user interface. …
Network-Integrated Ship Automatic System And Internetworking To The Internet, Li-Der Chou, Jeng Yih Juang
Network-Integrated Ship Automatic System And Internetworking To The Internet, Li-Der Chou, Jeng Yih Juang
Journal of Marine Science and Technology
Many automatic systems developed for the merchant ships are focused on the Unmanned Machinery Space (UMS), and therefore it is necessary to build a local area network (LAN) on the ship in order to integrate these automatic systems. By means of the Inmarsat satellite system, the shipboard LAN is interconnected with the terrestrial communication networks such as the Internet. In the paper, the shipboard LAN is designed from the view point of survivability, and three concepts to reduce the satellite communication cost for the interconnection of the shipboard LAN and the Internet are proposed. Finally, the way to implement the …
A Study On Fabrication Of Zinc Oxide Thin Film Acoustic Sensors, C.C. Chang, J.H. Chang
A Study On Fabrication Of Zinc Oxide Thin Film Acoustic Sensors, C.C. Chang, J.H. Chang
Journal of Marine Science and Technology
In this study, acoustic sensors were formed by depositing a zinc oxide (ZnO) thin film on a silicon dioxide/silicon(SiO/Si) substrate using radio frequency (RF) planar-magnetron sputtering method. The results showed higher substrate temperatures and higher RF powers enhanced C-axis oriented structure of the Zno thin film and optimized the ZnO thin film acoustic property. The frequency spectrum measurement on the acoustic sensor underwater involved three peaks at frequencies 640 KHz, 2.4 MHz and 2.9 MHz, respectively. Sensitivity reached to -132.02 dBrelv/ upa. The results indicated that under the pressure of acoustic frequencies the sensor response was directly proportional to pressure …