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A TDMA Based Scheme for the Construction of R2R Communication Platform
Der-Cherng Liaw,Chia-Wei Yeh,Sung-Ming Lo 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
In the previous study (Liaw and Kuo, 2012), a preliminary version of the Time Division Multiple Access (TDMA)-based communication platform had been successfully tested to provide the function of wireless hopping data transmission. However, that design was only valid for the consecutive nodes which are close-by. A modified design was proposed in (Liaw, Wang and Lai, 2013) by using self-design Wireless Sensor Network (WSN) nodes to investigate the feasibility of the application in short range data communication. The effect of the packet size and distance between two consecutive nodes on the performance of remote data transmission was also studied. Instead, in this paper, we propose another scheme for time division wireless monitoring transmission protocol (TDWMTP). This design is based on IEEE 802.11a standard with the transmission method of TDMA (Time Division Multiple Access) to enhance and implement the function proposed in (Liaw, Wang and Lai, 2013). Experimental results demonstrate the success of the proposed design.
Liaw, Sheng-Ju,Tso, Tai-Ly 한국분석과학회 1995 분석과학 Vol.8 No.4
Accurate measurements of ozone precursors are required to understand the process and extent of ozone formation in rural and urban areas. Nonmethane hydrocarbons (NMHCs) have been identified as important ozone precursors. Identification and quantification of NMHCs are difficult because of the large number present and the wide molecular weight range encountered in typical air samples. A major plan of the research team of the Climate and Air Quality Taiwan Station (CATs) was the measurement of atmospheric nonmethane hydrocarbons. An analytical method has been development for the analysis of the individual nonmethane hydrocarbons in ambient air at ppb (v) and subppb(v) levels. The whole ambient air samples were collected in canisters and analyzed by GC-FID with $Al_2O_3$/KCl PLOT column. Our targeted for quantitative analysis 43 compounds that may be substantial contributors to ozone formation. The retention indices and molar response factors of some commercially available $C_2{\sim}C_{10}$ hydrocarbons were determined and used to identify and quantify air samples. A quality assurance program was instituted to ensure that good measurements were made by participating in the International Nonmethane Hydrocarbon Intercomparison Experiments (NOMHICE).
( Liaw Sok Ying ) 부산대학교 간호과학연구소 2019 글로벌 건강과 간호 Vol.9 No.2
A simulation-based program, known as RAPIDS (Rescuing A Patient In Deteriorating Situations), was introduced into an undergraduate nursing program to develop nursing students’ clinical competence in caring for a patient with clinical deteriorations. A programmatic approach to research was set from the beginning, at the time of performing need analysis to evaluating the long-term outcomes of the RAPIDS program in clinical practice. A mixed methods approaches were employed for evaluating the outcomes of the program targeting at different levels of the Kirkpatrick’s model. Two important future innovations emerged that move forward the development of the RAPIDS program; multimedia resources (e-RAPIDS) in promoting retention of simulation learning and the use of simulated patients in preparing nursing students to manage their emotional responses in actual clinical practice. The ultimate goal of the RAPIDS program is to improve patient safety by enhancing nurses’ abilities in recognizing and managing ward deteriorating patients.
A CAN-Based Design for the Control of Electric Vehicle
Der-Cherng Liaw,Cheng-Yu Yu,Kuo-Chen Wu 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
Due to the development of the advanced technologies, in the recent years, electronic devices for the communication and computer engineering have been considered to implement the so-called “X-by-Wire” scheme for steering control and braking control of the vehicles. It is known that the weight reduction of vehicle systems can decrease the power consumption when the traditional mechanical components can be replaced by electronic devices. Thus, X-by-wire system will be a trend in the automotive industry for saving energy. An event trigger design for vehicle control is proposed in this paper for vehicle control by using the protocol of Controller Area Network (CAN). The proposed design covers the development of CAN communication node, which is developed by using microprocessor chip Microchip PIC18F4585 and MCP2551 CAN transceiver. In addition, an interactive GUI-based utility program developer is also built up for user to easily develop the required function call to cope with the design specification. A wireless electric-driven control vehicle is served as a platform to verify the design of drive-by-wire and brake-by-wire operations. Experimental results demonstrate the success of the proposed design.
A Design of Motion Control Law for UAV
Der-Cherng Liaw,Li-Feng Tsai 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
In this paper, a study of the nonlinear dynamical behavior of unmanned aerial vehicles (UAV) is presented. Based on a given mathematical model of quad-rotor UAV, all of the possible operational modes with given control input is discussed. Motion control law is also proposed for achieving a given desired operation mode by using back-stepping control approach. Simulation results are obtained to demonstrate the success of the proposed design.