Thepmanee, Teerawat

Preferred name

Thepmanee, Teerawat

Main Affiliation

School of Engineering

teerawat.th@kmitl.ac.th

Now showing 1 - 10 of 33

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Integrating m-Machine scheduling into MRP
(2009-12-01)
Masuchun, Ruedee
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Masuchun, Wiboon
;
Thepmanee, Teerawat
This paper presents an approach to integrate the m-machine production scheduling into Material Requirements Planning (MRP). In general, generating MRP considers only Bill of Materials (BOM) and ignores capacity constraints and operating sequences; therefore, a production plan is unachievable when scheduling is actually performed next on shop-floor. That is why recent research has focused on executing both MRP and scheduling simultaneously. Our approach uses an integer linear programming model to plan and schedule concurrently to look right through the capacity constraints and operating sequences. The objective function of the proposed model considers both planning and scheduling purposes that is to minimize total inventory costs and order's tardiness. All significant and inevitable concerns when separately generating MRP and schedule are incorporated with the model through several constraints. Numerical results show that this model can be used to simultaneously generate reasonable MRP as well as feasible and optimal m-machine production schedule. © 2009 IEEE.
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An influential principal point on camera parameters
(2008-12-01)
Sirisantisamrid, Kaset
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Thepmanee, Teerawat
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Tirasesth, Kitti
;
Matsuura, Takenobu
This paper proposes a method of camera calibration and the influence of principal point on camera parameters. The camera parameters are represented in terms of a set of intermediate parameters. The intermediate parameters and lens distortion coefficients are iteratively computed. The image coordinates are rectified on each cycle of iteration. Once the iteration is terminated, the initial parameters are computed from the obtained intermediate parameters. Then, the camera parameters and distortion coefficients are iteratively computed from the obtained initial parameters and the image coordinates are rectified too. In the experimental results, the proposed method is tested by change principal point to observe the influential principal point on camera parameters and compared the results with the conventional method.
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The technique to generate firing signal of converter for linear DC output
(2008-12-01)
Thepmanee, Teerawat
;
Pongswatd, Sawai
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Ukakimapurn, Prapart
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Tirasesth, Kitti
The firing angle adjustment of ac-dc converter that adjust firing angle proportional to control signal. The dc output voltage is not linear. This paper presents the technique to generate the firing signal for ac-dc converter which has linear dc output voltage. This technique decoded the arccosine value as binary data and save in ROM, before compare with control signal. All digital circuits and ROM were constructed using Field Programmable Gate Array (FPGA) and Verilog Hardware Description Language (Verilog HDL) so that the proposed technique has small size and ease of implementation. The experimental results show the dc output voltage and output waveform that agree with the design. Moreover, this technique can be applied to multi-output for dual converter and 3- phase system. © 2008 SICE.
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Reliability modeling for automatic operation mode of FSWO&FSWB system
(2017-06-07)
Yuchomboon, Yutthana
;
Thepmanee, Teerawat
This paper applies FMEA and FTA approach which has been proved to be acceptable and widely applied in many applications of modeling and methods supporting the production system and the safety and/or maintenance manager to identify how subsystems and components could fail and what are the corresponding effects on the whole system, and to quantify the reliability parameters for complex systems. A case study represents that the automatic operation mode from the primary fuel switch to secondary fuel called FSWO (Fuel Switch Over) procedure, which is the process of switching fuels from natural gas to oil fuel. For FSWB (Fuel Switch Back), this is process of switching from oil fuel to natural gas. The numerical illustrations and results substantiate that the model approach capable of pointing out and quantifying the importance of each component in the system.
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Foundation fieldbus-based laboratory: A case study of Harmonas-DEO system
(2011-01-01)
Thepmanee, Teerawat
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Pongswatd, Sawai
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Julsereewong, Amphawan
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Julsereewong, Prasit
This paper presents a Foundation Fieldbus-based laboratory for education of automation infrastructure. Design and implementation of a level-control plant model using multi-vendor field devices is proposed. Harmonas-DEO fieldbus system is described as an illustrative case study for configuring and commissioning fieldbus segment, defining control strategy, designing human machine interface (HMI) screen, and troubleshooting. Fieldbus control valve diagnostics based on the use of Valstaff are also included. © 2011 SICE.
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Digital fieldbus-Analog system integration for revamping projects
(2013-01-01)
Thepmanee, Teerawat
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Pannil, Pittaya
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Pongswatd, Sawai
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Rerkratn, Apinai
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Julsereewong, Amphawan
This paper presents a system integration of modern digital fieldbus and traditional analog devices for revamping projects. Using temperature transmitter with Foundation Fieldbus technology and power regulator with 4-20 mA control input for temperature control based on a PID instruction of programmable logic controller (PLC) is examined as an illustrative case study. A portable plant model was designed and implemented for real hands-on training. In addition, basic network and device configurations as well as ladder logic program and graphical user interface creations are discussed. Experimental results of temperature control in the range of 40-60 °C verifying the proposed concept are also included.
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Automatic SPRT module calibration using automated low thermal matrix scanners
(2011-08-12)
Thepmanee, Teerawat
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Namsirilert, Sumetha
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Pongswatd, Sawai
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Masuchun, Ruedee
In general, the process of the SPRT module calibration takes long time and requires all employees participation in the calibration process, and it also requires an expert for calculation of results and measurement uncertainty. All of these waste a vast amount of working time. Therefore, this paper provides the automatic SPRT module calibration process which can reduce the steps of calibration, resulting in process time reduction and the automatic process doesn't require the expert to calculate results and measurement uncertainty. © 2011 IEEE.
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Application of GD3 in value engineering for plastic-part design
(2008-12-01)
Thepmanee, Teerawat
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Sirilappanich, Surachet
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Pongswatd, Sawai
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Ukakimaparn, Prapart
This paper presents the technique in way engineering value that comes to apply for designing of product plastic. The technique analyzes the data of designing by GD<sup>3</sup> and measures defensive problem in advance of engineering value. Consequently, the technique can prevent the problem and control the designing relate to engineering value before build a mold for product. For acquire knowledge give with the work and can design the product that can have picture stability. Moreover, This technique can decrease material loss, time operation and inventory.
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A mathematical model evaluation for the standard uncertainty of Temperature uniformity
(2016-09-06)
Jaoskul, Yada
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Thepmanee, Teerawat
This paper presents a technique to evaluate for the standard uncertainty of temperature uniformity. In general, when considering the temperature test chamber as a constant temperature chamber that has achieved an arbitrary uniform temperature, the uncertainty at that achieved temperature can be separated into the two factors of chronological temperature fluctuation in time, and spatial temperature fluctuation, referred to as temperature uniformity. Temperature uniformity is represented through two methods: temperature variation in space base on the center of the working space, and temperature gradient considering the entire working space. To represent a linear integer mathematical model applied to evaluate temperature uniformity. The numerical illustrations and results substantiate that the model proposed is useful to simultaneously consider x and y axis when determining temperature uniformity. Moreover, we found that the linear integer model made a significant impact on uniformity of the temperature chambers.
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Design of a switched-capacitor-based serial DC-DC converter using clean energy power supplies
(2010-07-30)
Eguchi, Kei
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Pongswatd, Sawai
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Sugimura, Tatsuya
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Thepmanee, Teerawat
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Tirasesth, Kitti
For mobile back-lighting applications, a switched-capacitor-based serial DC-DC converter using solar power supplies is proposed in this paper. Unlike conventional switched-capacitor DC-DC converters, the proposed converter pushes up the output voltage of a switched-capacitor-based circuit by the voltage of solar cells. For this reason, the proposed converter can realize not only long battery runtime but also small hardware-cost and wide input-range. Concretely, in comparison with the conventional parallel converter using 1.5× step-up SC converters, the proposed converter can achieve 20% reduction of hardware cost and 16% extension of input range. The characteristics of the proposed converter are clarified by theoretical analyses. Furthermore, SPICE simulations and experiments show the validity of circuit design, where theoretical results correspond well with simulation results.

Thepmanee, Teerawat

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