Siripongdee, Surapong

Preferred name

Alternative Name

siripongdee, Surapong

Main Affiliation

College of Innovation and Industrial Management

surapong.si@kmitl.ac.th

Now showing 1 - 10 of 43

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Single commercially available ic-based electronically controllable voltage-mode first-order multifunction filter with complete standard functions and low output impedance
(2021-11-01)
Jaikla, Winai
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Buakhong, Unchittha
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Siripongdee, Surapong
;
Khateb, Fabian
;
Sotner, Roman
This paper presents the design of a voltage-mode three-input single-output multifunction first-order filter employing commercially available LT1228 IC for easy verification of the proposed circuit by laboratory measurements. The proposed filter is very simple, consisting of a single LT1228 as an active device with two resistors and one capacitor. The output voltage node is low impedance, resulting in an easy cascade-ability with other voltage-mode configurations. The proposed filter provides four filter responses: low-pass filter (LP), high-pass filter (HP), inverting all-pass filter (AP−), and non-inverting all-pass filter (AP+) in the same circuit configuration. The selection of output filter responses can be conducted without additional inverting or double gains, which is easy to be controlled by the digital method. The control of pole frequency and phase response can be conducted electronically through the bias current (I<inf>B</inf>). The matching condition during tuning the phase response with constant voltage gain is not required. Moreover, the pass-band voltage gain of the LP and HP functions can be controlled by adjusting the value of resistors without affecting the pole frequency and phase response. Additionally, the phase responses of the AP filters can be selected as both lagging or leading phase responses. The parasitic effects on the filtering performances were also analyzed and studied. The performances of the proposed filter were simulated and experimented with a ±5 V voltage supply. For the AP+ experimental result, the leading phase response for 1 kHz to 1 MHz frequency changed from 180 to 0 degrees. For the AP− experimental result, the lagging phase response for 1 kHz to 1 MHz frequency changed from 0 to −180 degrees. The design of the quadrature oscillator based on the proposed first-order filter is also included as an application example.
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Antecedents to Haidilao Hot Pot Restaurant Consumer Loyalty in Bangkok
(2024-01-01)
Fan, Hairui
;
Saengnoree, Amnuay
;
Siripongdee, Surapong
This study's objective was to develop a structural equation model (SEM) of factors influencing consumer loyalty at Bangkok's Haidilao Hot Pot (HHP) Chinese restaurants. The study focused on consumers who visited the Central World Mall and Central Rama 9 Mall branches at least once during June and July 2023. The researchers used stratified random sampling to collect 312 questionnaires from the consumers surveyed. The questionnaire's validity and reliability were ensured through expert evaluation and pilot testing, with Cronbach's alpha values ranging from 0.81 to 0.89. Data were collected via an online questionnaire in both Thai and English and assessed for content validity and reliability. The SEM path analysis was conducted using LISREL 9.10, while SPSS for Windows 21 was used for descriptive statistics. Results indicated that all SEM factors positively influenced consumer loyalty, explaining 63% of the variance. The three most significant factors were service innovation (0.79), service quality (0.64), and service satisfaction (0.61). This study extends the limited post-COVID-19 literature on the Asian food and service sector by validating a comprehensive model of consumer loyalty specific to Chinese hot pot restaurants. It highlights the essential nature of service innovation, quality, and satisfaction in fostering consumer loyalty. The findings provide valuable insights for restaurant industry practitioners, highlighting the need to invest in service innovation and maintain high service quality to enhance customer satisfaction and loyalty. These strategies are essential for sustainable growth and operational improvements.
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Design of Second Order Lowpass and Bandpass Filter Using Single VDDDA and Its Modification as Sinusoidal Oscillator
(2019-12-01)
Kulapong, Worawut
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Siripongdee, Surapong
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Jaikla, Winai
This paper introduces an electronically controllable voltage mode analog biquad filter which is designed based on the series resistor-inductor-capacitor (RLC) topology. The proposed second order filter employs one active device, voltage differencing differential difference amplifier (VDDDA) and three passive elements (one resistor and two grounded capacitors). The natural frequency (\omega-{0}) is controlled electronically as well as quality factor (Q) by changing the bias current. Two filter responses, lowpass (LP) and bandpass (BP) functions with unity voltage gain are simultaneously achieved. The proposed voltage-mode biquad filter consists of two input voltage nodes with high impedance. These input voltages are employed to select the inverting or non-inverting filter response. The sinusoidal oscillator is realized by slight modification of the proposed voltage-mode biquad filter. The sinusoidal voltage output node is low impedance. With this configuration, the proposed sinusoidal oscillator can be connected to other circuits without requirement of the additional buffer devices. The proposed filter and sinusoidal oscillator employ a few in number of the passive and active devices (also with grounded capacitors). The proposed circuits are interesting for monolithic integrated circuit (IC) realization. Pspice simulation program and TSMC 0. 18m CMOS process parameters with ± 0.9V are employed to verify the functionality of the presented biquad filter and sinusoidal generator.
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Three-inputs single-output voltage-mode universal filter with orthogonal control using single commercially available IC
(2017-07-02)
Suwanjan, Peerawut
;
Siripongdee, Surapong
;
Jaikla, Winai
In this study, a new electronically tunable voltage-mode second-order universal filter as a new application for commercially available IC named LT1228 from Linear Technology Inc is presented. The proposed filter with three-inputs and single output voltage uses single LT1228, two resistors and two capacitors, which is well suited for off-the-shelf implementation. The proposed filter can provide high pass (HP), low pass (LP), band pass (BP), band reject (BR) and all pass (AP) responses with electronic control of the quality factor (Q) and the natural frequency (ω0). The control of quality factor can be done without affecting natural frequency. The selection of filter response can be done without any critical passive component matching conditions and double gain amplifier circuit. A number of simulations based on PSPICE program are achieved in order to demonstrate the performance of the proposed filter.
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Structural equation modeling analysis of queuing system performance at Thailand's provincial electricity authority (PEA)
(2014-03-19)
Siripongdee, Surapong
;
Fongsuwan, Wanno
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Trimetsoontorn, Jirasek
This study is an analysis using Structural Equation Modeling on the queuing performance management of Thailand's Provincial Electricity Authority (PEA) which is a government agency organizing production and distribution of electricity being delivered to the public. Due to the growing numbers of businesses and industries in the provinces, PEA's 73 sales offices are vital to the stability of Thailand. Research methodologies used within this study include both quantitative and qualitative research. Quantitative is further qualified in this research essay from the survey given to 344 PEA executives. The Partial Least Square (PLS) technique, a form of structural equation modeling, is additionally used due to it being component-based rather than covariance-based. Additionally, qualitative research is supported by input from questionnaires from 10 key Thai PEA officials utilizing the purposive sampling approach. The results showed that three factors had an immediate and positive impact on management innovation, including the management performance, organizational factors and management innovation. Furthermore, there was also an immediate and positive impact on queuing performance management of the PEA. A fact recognized by a hypothesis significance p<0.01, respectively, with the results of qualitative research being consistent with the results of quantitative research. The findings from this study concluded that if an organization has a good enterprise management system, management innovation and organizational performance increases. © 2014 Academic Journals Inc.
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One input voltage and three output voltage universal biquad filters with orthogonal tune of frequency and bandwidth
(2021-08-01)
Wai, May Phu Pwint
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Chaichana, Amornchai
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Jaikla, Winai
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Siripongdee, Surapong
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Suwanjan, Peerawut
This research paper contributes the one input three output voltage mode universal biquad filters with linear and electronic control of the natural frequency (ω0), using two commercially available ICs, LT1228s as active device with two grounded capacitors, five resistors. The presented universal biquad filters can simultaneously provide three voltage-mode filtering functions, low-pass (LP), high-pass (HP) and band-pass (BP) without changing the circuit architecture. Furthermore, the first presented biquad filter provides low impedance at HP, BP voltage output nodes and LP, BP output voltage nodes are low impedance for the second proposed filter which is easy cascade ability with other voltage mode circuits without the employment of buffer circuits. The quality factor (Q) of both proposed filters is orthogonally adjusted from the passband voltage gain and ω0. The proposed filters are simulated and experimented with commercially accessible ICs, LT1228. The simulated and experimental results demonstrate the filtering performances.
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System-Social Strategy for Trust Building in Mobile Banking Context
(2024-05-01)
Tun, Phyo Min
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Nantha, Cherisa
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Srivallop, Atikom
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Siripongdee, Surapong
This paper aims to examine the roles of system and social perspectives for trust building in the mobile banking context and the moderating effects of demographic groups on direct effects on trust. The study investigates system perspectives (system quality and system usefulness), social perspectives (social influence and word-of-mouth), and moderators (gender, age, and education) as an exploratory study. This study employed deductive reasoning quantitative research approach by using 294 datasets. Exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) were used to calculate the factors' validity and reliability. The Structural Equation Modeling (SEM) technique was employed to estimate direct effects, indirect effects, and moderator effects. The findings reveal that system quality, system usefulness, and word-of-mouth affect trust, while social influence has an insignificant effect on trust. Besides, system quality has a significant effect on system usefulness, and social influence has a significant effect on word-of-mouth, respectively. Also, education level is significantly moderating the direct effect of word-of-mouth and trust. This research extends the understanding of the system and social perspectives that influence trust and might be a barrier to mobile banking adoption in Myanmar. Also, the findings of this research will assist private banks in recognizing the behavior patterns of customers so that they can create a proper system-social strategy to boost the confidence of customers about mobile banking and fulfill the knowledge gap regarding system and social aspects.
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MISO current-mode biquad filter with independent control of pole frequency and quality factor
(2012-09-01)
Jaikla, Winai
;
Siripongdee, Surapong
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Suwanjan, Peerawut
This article presents a three-inputs single-output biquadratic filter performing completely standard functions: low-pass, high-pass, band-pass, band-reject and allpass functions, based on current controlled current conveyor transconductance amplifier (CCCCTA). The quality factor and pole frequency can be electronically/independently tuned via the input bias current. The proposed circuit uses 2 CCCCTAs and 2 grounded capacitors without any external resistors which is very suitable to further develop into an integrated circuit. The filter does not require double input current signal. Each function response can be selected by suitably selecting input signals with digital method. Moreover, the circuit possesses high output impedance which would be an ideal choice for currentmode cascading. The PSPICE simulation results are included to verify the workability of the proposed filter. The given results agree well with the theoretical anticipation.
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Electronically controllable first-order multifuntion filter with using single active building block
(2018-06-08)
Chinpark, Kobkiat
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Jaikla, Winai
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Siripongdee, Surapong
;
Suwanjan, Peerawut
In this paper, a new voltage-mode first-order multifunction filter using the modified current controlled current conveyor transconductance amplifier (M-CCCCTA) is presented. The proposed filter has two input-voltage nodes with single output voltage node. It can realize three first-order filtering output responses, low-pas filter (LPF), high-pass filter (HPF) and all-pass filter (APF). The natural frequency is electronically tuned. For all-pass filter, the phase shift is electronically varied from 0 to 180 degree which is conveniently controlled by microprocessor or microcontroller. Also, the matching condition of the parameter used to tune the phase response is not required. The proposed first-order filter employs single grounded capacitor, single grounded resistor, and single M-CCCCTA. The simulation results from PSpice program are included to confirm workability of the proposed filter.
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Drivers of Revisit Intentions at Michelin-Starred Restaurants in Thailand: The Role of Innovation, Quality, and Satisfaction
(2024-01-01)
Rattanaparinyanon, Harit
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Vuthisopon, Sujira
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Saengnoree, Amnuay
;
Siripongdee, Surapong
This study analyzed factors impacting consumers’ revisit intentions at Michelin-starred restaurants in Thailand. Survey data from 400 patrons of Michelin-starred establishments revealed high intentions to revisit driven by service innovation, product innovation, restaurant quality, and customer satisfaction. Structural equation modeling indicated a significant positive influence of these four key factors – collectively explaining 60.7% of the variance in repeat patronage intentions. The findings imply that emphasizing creativity and novelty in food and service delivery enhancements, upholding facility excellence, and ensuring positive sensory and value perceptions underpins customer loyalty for Michelin-starred dining. Practical and policy implications center on restaurant and tourism industry strategies to continually elevate standards, differentiate offerings, and promote Thailand as a premier culinary destination. Addressing limitations of sample representation and variables examined, further research should adopt mixed methods designs incorporating observational and longitudinal approaches to deepen insight into revisiting behavior within luxury dining segments.

Siripongdee, Surapong

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