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Subject: Physics and Astronomy

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Now showing 1 - 10 of 35
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    Design and simulation of outbound functions in warehouse operations with queueing theory
    (2021-05-19) Worawut Han-Klup; Taweesak Samanchuen; Mahidol University
    In modern e-commerce, warehouse management is very crucial for overall service quality. Moreover, the cost of order picking in outbound logistics is estimated to be more than half of the total operating cost in warehouse activity. This work studies... the efficiency of these operations, the simulation method is utilized. The result shows that the simulation is adequate in approximating the optimal number of pickers and packers. This work is explained generally to be practical for business leading to future
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    Indoor Air Monitoring in Restaurant Using Portable Electronic Nose
    (2018-12-12) Theerapat Pobkrut; Satetha Siyang; Treenet Thepodum; Teerakiat Kerdcharoen; Mahidol University
    © 2018 IEEE. The objective of this work is to examine the efficiency of the odor removal air purification systems which were installed in a Barbecue restaurant and a Hotpot restaurant. Portable electronic nose device was used for the assessment... of the odor so as to determine the best operating conditions for the purification system. This study is part of an attempt of the restaurants to reduce residual odor in their dining spaces, in order to increase customer traffic during the weekday lunch time
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    Multiscale image analysis through the surface-shape operator
    (2000-07-01) Phongsuphap Sukanya; Ryo Takamatsu; Makoto Sato; Mahidol University; Saitama University; Tokyo Institute of Technology
    This paper proposes a new operator called the surface-shape operator for describing image structure. We consider an image function as a bivariate surface, then established the surface-shape operator for describing the shape of each pixel compared... also extend the surface-shape operator to have the capability of describing multiscale topographic structures by incorporating in scale-space representation. The surface-shape operator has invariant properties under linear and monotonic gray-tone
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    Development of Arduino-based logic gate training kit
    (2018-12-19) S. W. Khaing; S. Nopparatjamjomras; T. R. Nopparatjamjomras; R. Chitaree; Mahidol University; Commission on Higher Education
    © Published under licence by IOP Publishing Ltd. In this work, we develop a compact, robust, and portable Arduino-based logic gate training kit. It was designed for an electronic engineering undergraduate university course in order to learn a... fundamental concept of logic gates operation regarding to six logic gates; AND, NAND, OR, NOR, XOR, and XNOR. An ATmega 2560 Arduino board was used to develop the training kit. It consists of two 3.7V batteries as a power supply, 2-input or 3-input selectors
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    Completely positive trace-preserving maps for higher-order unraveling of Lindblad master equations
    (2024-12-01) Wonglakhon N.; Wiseman H.M.; Chantasri A.; Wonglakhon N.; Mahidol University
    Theoretical tools used in processing continuous measurement records from real experiments to obtain quantum trajectories can easily lead to numerical errors due to a noninfinitesimal time resolution. In this work we propose a systematic assessment... of the accuracy of a map. We perform error analyses for diffusive quantum trajectories, based on single-Time-step Kraus operators proposed in the literature, and find the orders in time increments Δt, to which such operators satisfy the conditions for valid
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    Performance of solid oxide electrolysis cell having bi-layered electrolyte during steam electrolysis and carbon dioxide electrolysis
    (2011-01-01) Pattaraporn Kim-Lohsoontorn; Navadol Laosiripojana; Joongmyeon Bae; Mahidol University; King Mongkuts University of Technology Thonburi; Korea Advanced Institute of Science & Technology
    in the development of high temperature SOECs based on cell assemblies composed of nickel-yttria stabilised zirconia (Ni-YSZ) hydrogen electrode/YSZ electrolyte/lanthanum strontium manganite-YSZ (LSM-YSZ) oxygen electrode; however, the cell operated under SOEC mode... was found to exhibit lower performance than SOFC mode. Research is therefore driven towards the selection of materials for SOEC compartments. The work reported here seeks to investigate the performance of SOEC electrolytes. The use of bi-layered gadolinium
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    Quantum approximate optimization and k-means algorithms for data clustering
    (2021-01-28) Jirawat Saiphet; Sujin Suwanna; Thiparat Chotibut; Areeya Chantasri; Griffith University; Chulalongkorn University; Mahidol University
    , for optimization problems. In this work we investigate the possibility of applying QAOA to a clustering problem and compare its performance with the classical k-means algorithm. It turns out that the weights in graph connectivity can degrade the algorithm operation... variational hybrid algorithm, which utilizes a NISQ device as a sub-unit for specific tasks and performs most calculations on a classical computer. QAOA provides an approximate solution, with arbitrary precision as the number of operations increases
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    Multi-walled carbon nanotube-doped tungsten oxide thin films for hydrogen gas sensing
    (2010-08-01) Chatchawal Wongchoosuk; Anurat Wisitsoraat; Ditsayut Phokharatkul; Adisorn Tuantranont; Teerakiat Kerdcharoen; Mahidol University; Thailand National Electronics and Computer Technology Center
    In this work we have fabricated hydrogen gas sensors based on undoped and 1 wt% multi-walled carbon nanotube (MWCNT)-doped tungsten oxide (WO3) thin films by means of the powder mixing and electron beam (E-beam) evaporation technique. Hydrogen... sensing properties of the thin films have been investigated at different operating temperatures and gas concentrations ranging from 100 ppm to 50,000 ppm. The results indicate that the MWCNT-doped WO3thin film exhibits high sensitivity and selectivity
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    Preliminary analysis of the Changvan neutron monitor operation in latitude surveys during 2019-2020
    (2021-01-28) S. Khamphakdee; P. Jiang; P. Chuanraksasat; W. Nuntiyakul; D. Ruffolo; A. Sáiz; P. Evenson; K. Munakata; J. Madsen; B. Soonthorntham; S. Komonjinda; R. Macatangay; Polar Research Institute of China; University of Wisconsin-Madison; Shinshu University; Mahidol University; Chiang Mai University; The Bartol Research Institute; National Astronomical Research Institute of Thailand
    . In this work, we show a preliminary analysis of Changvan monitor data collected from two latitude surveys during 2019-2020 on the Chinese icebreaker MV Xue Long from Shanghai, China to Zhongshan station, Antarctica and back. A strong anti-correlation can
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    Time-delayed quantum feedback and incomplete decoherence suppression with a no-knowledge measurement
    (2021-02-01) Jirawat Saiphet; Sujin Suwanna; André R.R. Carvalho; Areeya Chantasri; Griffith University; Mahidol University; Q-CTRL Pty Ltd
    for the instantaneous feedback, which is impractical in real experiments. Therefore, in this work, we generalize the original work and investigate how the decoherence suppression can be degraded with unavoidable delay times, by analyzing non-Markovian average dynamics.... We present analytical expressions for the average dynamics and numerically analyze the effects of the delayed feedback for a coherently driven two-level system, coupled to a bosonic bath via a Hermitian coupling operator. We also find that, when