A Smart Pre-Warning, Guide, Alarm, Recovery and Detection (GUARD) Network System for the Blind

[[abstract]]This paper discusses the critical technologies that are used in the development of optical wireless communication network, in the protection of the safety, and in the provision of convenience to the vision-impaired population. The technologies of the realizations of the hardware, firmware, decision algorithms, communication protocols and application programs developed for Sensor Nodes in optical wireless communication network are applied for the Smart Blind-Guidance Network System. In addition, this technology is aided by the assistant equipment (cane) for the blind and the communication interface protocol for the computer, which is specifically designed for the blind. The smart blind-guidance system is a combination of optics, microprocessor, voice acoustics, and wireless electronics. This system also possesses the functions of distance measuring and environment parameters, collecting to finish a complete Pre-warning, Guide, Alarm, Recovery and Detection (GUARD) guide system for the blind and also completing a locating and addressing system.[[notice]]補正完畢[[incitationindex]]E

The Hardware Design for a Genetic Algorithm Accelerator for Packet Scheduling Problems

[[abstract]]In the basic genetic algorithm and its variations, they usually process the calculations in a sequential way so that the waiting time for every generation member awaited to be processed increases dramatically when the generation evolution continues. Consequently the algorithm converging rate becomes a serious problem when we try to apply the genetic algorithm in real time system operations such as in the packet scheduling and channels assignment in the fiber optic networks.We first propose in this paper a genetic algorithm accelerator which has the capability not only to accelerate the algorithm convergent rate but also to have its solution to reach the problem's optimum solution. Then we develop hardware blocks such as the blocks of Base Generator, Operation Selector, Delta Calculator, Duplicate Priority Encoder, Abort Priority Encoder and Next Generator, etc. to realize this proposed generic algorithm accelerator. Due to these hardware blocks realizations it will enhance the speed of the algorithm converging rate and make certain its convergent solution reaches the problem's optimum solution.[[notice]]補正完畢[[incitationindex]]E

Chip Design of White LED Driver

[[abstract]]The portable electronic products are widely used in daily life. Because most of these products need screen or backlight, the white LED is popularly applied to these products. In many applications, we need an IC driver to supply the necessary power to drive the White LEDs. There are two kinds of drivers, parallel type and series type, each of them has its own advantages and disadvantages. The parallel one can be fabricated with standard CMOS process instead of using the wing high voltage CMOS process. In this paper, we will present the process of implementing a white LED driver chip. It is using Taiwan Semiconductor TSMC’s Manufacture Inc. 0.35 um 2P4M process. The circuit designed with the described process can be operated at 3.2 5.5 V input voltage to generate 4.7 5.2 V output voltage. Maximum output current can be running up to 100 mA. This driver IC is implemented with capacitors instead of inductors to avoid possible electromagnetism interference. The proposed circuit consists of voltage reference circuit, oscillator circuit and charge pump circuit. The circuit design, the theoretical analysis of the circuit, circuit simulation results and measured results are all discussed this paper. The proposed driver can be applied in the white light LED driver, LED Brightness Controller, Li-Ion Battery recharge system, or a voltage supplier to supply 5 V voltage to PCMCIA.[[notice]]補正完畢[[incitationindex]]E

[[alternative]]The Design of Blind Guidance System and Guide Robot(II)

計畫編號：NSC94-2745-E032-004-URD研究期間：200508~200607研究經費：821,000[[sponsorship]]行政院國家科學委員

[[alternative]]The Design of Blind Guidance System and Guide Robot(I)

計畫編號：NSC93-2745-E032-004-URD研究期間：200408~200507研究經費：776,000[[sponsorship]]行政院國家科學委員

[[alternative]]Design of Robust System and Smart Network for Broadband Optical Metro and Access Networks(I)

計畫編號：NSC94-2213-E032-005研究期間：200508~200607研究經費：660,000[[abstract]]Part A: 提出一寬頻光都會與接取網路之強健系統設計，利用強健控制器來使雷射波長更穩定縮短穩定時間且 利用參數最佳化設計來調整網路效能(包括溫度變化與元件的老化等)，也針對所用的強健控制系統作 硬體的實現來驗證我們所設計的控制器。 (1) 強健控制器設計 (2) 波長穩定控制器之分析與設計 (3) 網路元件之強健動態控制系統分析 (4) 強健控制器最佳化設計 (5) 波長穩定控制器之最佳化分析與設計 (6) 網路元件之強健動態控制系統設計 (7) 強健控制器硬體設計 (8) 波長穩定控制器之實際參數分析與設計 (9) 網路元件之強健動態控制最佳化 Part B: 提出由基因演算法來對每個網路元件作動態控制器設計，針對光接取網路提出基因演算法加速裝置將 網路作最佳化的調整使網路效能達最佳化。另一方面，我們也對寬頻光都會與接取網路之智慧網路設 計增加網路的效能。 (1) 基因演算法之最佳化控制設計 (2) 基因演算法加速裝置之光接取網路設計 (3) 智慧網路之光接取網路設計 (4) 基因演算法之動態控制設計 (5) 管線型基因演算法加速裝置之光接取網路設計 (6) 智慧網路之光接取網路設計 (7) 基因演算法之光接取網路動態控制設計 (8) 管線型基因演算法加速裝置硬體設計 (9) 智慧網路之光接取網路最佳化設計 Part C: 將強健系統與智慧網路套用至PON(Passive Optical Network) 的系統中來驗證， 包括針對 WDM-PON(Wavelength Division Multiplexing-PON) 與CDMA-PON (Code Division Multiple Access-PON)的最佳化設計，另一方面也針對WDM-PON與CDMA-PON的MAC(Media Access Control) 做規劃與設計(包括封包的設計等)，利用GA 來做波長分配與碼分配的最佳化且用於MAN(Metro Aera Network)，最後加入平型式之錯誤更正碼來增加與改善網路系統的效能。 (1) PON 智慧網路設計 (2) WDM-PON 與CDMA-PON 之智慧網路設計 (3) 平行架構之錯誤更正碼探討 (4) PON 智慧網路最佳化設計 (5) WDM-PON 與CDMA-PON 之網路協定設計 (6) 平行架構錯誤更正碼之硬體設計 (7) PON 智慧網路之控制器與基因演算法之實現 (8) WDM-PON 與CDMA-PON 網路最佳化設計 (9) 利用GA 來做波長與碼的分配最佳化 (10) 在MAN 中網路與WDM-PON/CDMA-PON 溝通之探討 (11) 智慧型網路結合平行架構之錯誤更正碼之分析[[sponsorship]]行政院國家科學委員

Application of Novel Digital Techniques for the Design of High Sensitivity Limiting Amplifier

[[abstract]]In this letter we utilize the novel digital techniques (TW, DRMC, DS) to improve the sensitivity of the limiting amplifier. The Time Window (TW) technique can ignore the positive & negative trigger noises within the window close time. The Delay Racing Memory Counter (DRMC) technique can eliminate the positive trigger noises within the window open time. The Delay Sum (DS) technique can solve the negative trigger noise around the signal transition from low to high. The experimental results are also presented.[[notice]]補正完畢[[incitationindex]]E

The effects of microwave oven over the IEEE 802.11 FHSS wireless LAN card

[[abstract]]We have investigated the effects of microwave ovens over the IEEE 802.11 FHSS wireless LAN card. The measured MAC frame error rate (FER) is affected by the microwave ovens. The signal spectrum radiated from the microwave oven can be used to verify the measured FER data. The performance of the specific bands assigned to some geographic locations in the IEEE 802.11 standard have been discussed in the paper. From these measurement results we can obtain that the performance of some channels within the IEEE 802.11 FHSS wireless LAN card can be seriously deteriorated. Therefore, the location of the microwave oven and the specific channels for the wireless LAN card should be pre-determined according to the experience guideline.[[conferencetype]]國際[[conferencedate]]19991018~19991022[[booktype]]紙本[[conferencelocation]]Beijing, Chin

Multi-rate transmissions in infrastructure wireless LAN based on IEEE 802.11b protocol

[[abstract]]We discuss the issues of providing multiple data rates (1/2/5.5/11 Mbps) over an IEEE 802-11 infrastructure wireless network. With the characteristic of modulation schemes, the data rate of the wireless network is inversely proportional with the transmission distance. A moving mobile station needs to dynamically adjust the modulation scheme to keep the connection alive and to achieve the maximum network throughput. To do this, the mobile stations are requested to detect the distance between access point and itself from time to time. A simple broadcasting approach is proposed for mobile stations to detect their locations in the wireless network. Based on this information, the mobile node can easily determine the proper transmission rate[[conferencetype]]國際[[conferencedate]]20011007~20011011[[booktype]]紙本[[iscallforpapers]]Y[[conferencelocation]]Atlantic City, NJ, US

The impact of laser phase noise on the coherent subcarrier multiplexing system

[[abstract]]In coherent optical subcarrier multiplexing (CSCM) systems, the laser phase noise may cause signal spectrum broadening and hence, causes significant deterioration in the system performance. The impact of phase noise on the CSCM system is analyzed in terms of carrier-to-noise ratio, intermodulation distortion, and adjacent channel crosstalk. The optimal modulation index and carrier to noise ratio are also presented. Some numerical results are outlined[[incitationindex]]SCI[[incitationindex]]EI[[booktype]]紙本[[booktype]]電子