Chaichana, Amornchai
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Chaichana, Amornchai
Alternative Name
Chaichana, Amonchai
Chaichana, Amornchia
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Email
amornchai.ch@kmitl.ac.th
19 results
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Item type:Publication, Electronically tunable current-mode quadrature oscillator derived from first-order allpass filter(2014-01-01); In this study, an electronic controllability current-mode quadrature oscillator based on first-order all pass filter employing current follower cascaded Tran conductance amplifier (CFCTA) is presented. The proposed oscillator uses two CFCTAs, two electronic resistors and two grounded capacitor, which is easier for monolithic IC implementation. The condition of oscillation (CO) and frequency of oscillation are electronically and independently controlled which is well suited to use in modern electronic devices controlled by microprocessor. Moreover, the oscillator possesses high output impedances and thus it enables simple current-mode cascading. The PSPICE simulation results are included, verifying the workability of the proposed current-mode oscillator. The given results agree well with the theoretical anticipation. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A study of health service accessibility in aging society and technological development: A case of the urban community surround sirinthorn Hospital, Bangkok(2020-11-04); ; ; Munkong, PratumThe situation of health in aging society and the issues on travelling in city communities in Bangkok have a relationship with its environment where is under an investigation of health activities and patterns of travelling among the elderly. This research aims to examine health activities, patterns of travelling and factors influencing health service assess in city communities among the elderly. Following the objectives of the present study, suggestions for further development are given to relevant departments.The major findings of the situation on travelling and problems on receiving health service of the elderly who have lived in city communities of Sirindhorn hospital, Bangkok leads to some recommendations for developing patterns of travelling for health service, designing activities for the elderly with different ages to have appropriate health service and promoting an engaging environment in the communities - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Classroom Management as Virtual World for Creating Professional Teaching Environment(2024-01-01); ; Phetsinchorn, AueamaumpornResearch and innovation for community or local development, aims at providing the individuals with a high quality of life and enhancing capabilities for competition through collaborative efforts of stakeholders, including beneficiaries in the area, especially the academic sector of which powerful educational institutions in the central and metropolitan areas of Thailand. Innovation in vocational education management through online teaching environments intends to have educational innovations in the central and metropolitan areas as a mechanism and process of educational reform that can manage online teaching in line with the local context. This involves flexible and adaptable management that eliminates the need for travel and reduces consumption of resources. This is achieved by research objective of 1) developing innovations in vocational education management through online teaching environments to enhance educational efficiency, 2) reducing educational quality disparities by designing virtual reality training centers for professional skill development, with a case study in the field of art and design, and 3) developing mechanisms for collaborative education management in the community, through the design and use of application programs to create a professional teaching environment. Therefore, this research and innovation in vocational education management in the central region of Thailand through online teaching environments can enhance self-directed learning. This involves designing and developing learning technology, creating a virtual world to establish a professional teaching environment, and innovating learning application programs from 400 sampling. The education system in this changing crisis has a responsibility to stimulate and revive the grassroots economy after the crisis. This emphasizes the crucial role of education as a continuous tool in building economic and social resilience later. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A new quadrature sinusoidal oscillator for telecommunication system using VDDDAs(2016-03-22); ; ; A CMOS voltage differencing differential difference amplifiers (VDDDAs) based voltage-mode quadrature sinusoidal oscillator is proposed. The proposed oscillator is based on the two integrator loop configuration with amplifier wherein the frequency of oscillation (FO) is tuned by the time constant of two integrator and the condition of oscillation (CO) is tuned by gain of amplifier. It is constructed from two VDDDAs, two resistors, and two grounded capacitors. With this structure, it is attractive to develop in monolithic chip. The tuning of frequency of oscillation can be electronically done without affecting the condition of oscillation. Also, the condition of oscillation can be adjusted by external resistor without affecting to frequency of oscillation. The simulation results have been demonstrated and discussed using parameters of 0.18um TSMC CMOS technology and +0.9V power supply voltages. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Electronically Adjustable Voltage-mode First-order Allpass Filter Using Single Commercially Available IC(2019-01-01); ; In this design, the use of single commercially available integrated circuit (IC), LT1228 from Linear Technology Corporation, to implement the first order allpass filter is presented. The passband voltage gain of the presented first allpass filter (APF) is unit and constant throughout the operation frequency, while the phase response is electronically tuned by changing the external DC bias current. With this property, the proposed first order filter can be used as phase shifter with microcontroller controllability. Tuning phase property is not required any matching condition. The proposed phase shifter consists of one LT1228, one capacitor and two resistors which is attractive for off the shelf implementation. Moreover, the impedance at output voltage node is exhibit low which can connect to other circuit without the requirement of external voltage buffer. The expected performances of the proposed circuit are proved by Pspice simulation using macro model parameters. Also, the quadrature sinusoidal oscillator which is designed from the connecting of the proposed filter and integrator is chosen as application example. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Multifunction Voltage-Mode Filter Using Single Voltage Differencing Differential Difference Amplifier(2017-02-09); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Simple realization of quadrature sinusoidal oscillator with independent control(2017-07-02); In this paper, a new sinusoidal oscillator is proposed. As a interesting feature, the proposed oscillator provides two sinusoidal voltage waveforms with 90° degree phase difference without the requirement of additional phase shifter circuit. The proposed circuit employs only a voltage differencing current conveyor (VDCC), three resistors and two grounded capacitors. The frequency of oscillation (FO) and condition of oscillation (CO) can be independently controlled. Also, the tuning of frequency of oscillation can be done electronically. The use of single active is highly attractive from integration point of view. PSPICE simulations using 0.18μm CMOS parameters and supply voltage of ±0.9V demonstrates a precise operation. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Design of Electronically Controllable Quadrature Sinusoidal Oscillator with Linear Control of Frequency(2019-12-01); ; ; Sotner, RomanIn this paper, the design of sinusoidal oscillator which generates two output voltages with 90° degree phase difference is presented. The design procedure is started from the function block diagram to proposed oscillator using commercially available ICs. The proposed oscillator is constructed from three OTAs, one voltage summing circuit, one grounded resistor and two grounded capacitors. The frequency of the generated sinusoidal waveform is electronically and linearly controlled without disturbing the condition for oscillating of the system. With this feature, the proposed oscillator is used to generates the frequency modulation (FM) signal. The magnitude of the quadrature voltage waveform is equal during adjusting the generated frequency. A Pspice simulation and experiment are done to verify the performance of the proposed circuit. The macro models of available ICs, LM13700 and AD830 are employed for simulation. The simulation and experimental results confirm theory well as expected. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, MIMO-type current-mode multifunction biquadratic filter using a MCDTA(2013-01-01); This paper presents a current-mode multifunction biquadratic filter with multiple inputs and multiple outputs using a single modified current differencing transconductance amplifier and two grounded capacitors. The proposed circuit provides following advantages: low number of active and passive elements; realization of lowpass, bandpass, highpass, bandstop and allpass filtering functions; employment of grounded capacitors which is suitable for integrated circuit implementation; no requirement with the component-matching conditions and the inverting-type input signals; electronic control of the natural frequency; low active and passive sensitivities. The PSPICE simulation using standard CMOS technology is performed to confirm the workability of the proposed universal filter. © 2013 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Communications Services and Management of Application Program to Promote Community’s Products by Energy Saving of Prawet Burirom Shore(2025-01-01); ; Phetsinchorn, AueamaumpornThis research project based on a case study are threefold, (i) to design learning platform in an application program for promoting community’s products in Hua Takhe Old Market, Prawet Burirom Shore, (ii) to determine outstanding features of products in the community network, and (iii) to evaluate the efficiency of the developed application program. Qualitative research method which had three steps was applied in conducting this study; Step One aimed to survey some outstanding features of products in the community network of Prawet Burirom Shore and to interview experts in application program, Step Two focused on developing and evaluating the application program as well as summarising results of the use of the application program from experts in information technology production, and Step Three operated pilot-testing and investigating the efficiency of the application program used to learn products of the community network of Prawet Burirom Shore. The results on the use of the application program indicated that for promoting community’s products in Hua Takhe Old Market, Prawet Burirom Shore revealed patterns of physical environment, promotion of community’s products on the application program, and urban community design through learning of products in the community. A success emerged in this research project was effective measures of energy-saving from policy of development and prevention of environment for city of learning.