Thepmanee, Teerawat

Preferred name

Thepmanee, Teerawat

Main Affiliation

School of Engineering

teerawat.th@kmitl.ac.th

Now showing 1 - 9 of 9

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Integrating m-Machine scheduling into MRP
(2009-12-01)
Masuchun, Ruedee
;
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
;
Thepmanee, Teerawat
;
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
;
Ukakimapurn, Prapart
;
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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Application of GD3 in value engineering for plastic-part design
(2008-12-01)
Thepmanee, Teerawat
;
Sirilappanich, Surachet
;
Pongswatd, Sawai
;
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 simple technique to modeling and simulation four-axe robot-arm control
(2007-12-01)
Thepmanee, Teerawat
;
Sripituk, Jettiya
;
Ukakimapurn, Prapart
This paper presents modeling and real-time simulation programs that were developed for robot arm control. The technique analyzes the safety path, working area and step motion of robot. The implementation of experimental forward and inverse kinematics control method as Matlab m-files is described. The visualization and animation capabilities of Matlab provide a realistic perception of behavior of the test beds without robot or before send the command to robot. Control mode in manual and automatic by a joystick and library file via PC respectively. ©ICROS.
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Seeded Region Growing based on Localizing Histogram
(2003-10-16)
Sirisantisamrid, Kaset
;
Kummool, Sart
;
Srisuttaboot, Sasi
;
Thepmanee, Teerawat
This article presents segmenting image by seeded region growing and using a technique for selecting the suitable seed points from localizing histogram. Any gray levels on histogram have the maximum frequency (local maximum) in each period, and then defined as seed points of that period. The seed point closely attached with one then combined together as seed region. The obtained seed regions are performed region growing by iterative method until can not be done. Finally, the obtained sub-regions are merging by consideration from the group of average gray level of histogram or arbitrary setting by user. The purposed method of image segmentation compared with other one as shown on the experimental results and its advantage is reduce computational time.
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Pressure control of pneumatic-pressure-load system using generalized predictive controller
(2008-12-01)
Chaewieang, Pipat
;
Sirisantisamrit, Kaset
;
Thepmanee, Teerawat
This paper presents the pressure control by using generalized predictive controller (GPC) for the pneumatic-pressure-load system at which electro-pneumatic proportional pressure valve is employed as actuator. Since characteristic of one is time-varying and nonlinear, a three-order controlled auto-regressive moving average (CARMA) model suitable for pneumatic actuator is then used to modeling process system by using recursive least-squares method with forgetting factor to estimate the model parameter. For the proposed control method, system parameters are estimated only, state parameters are not. Experimental results show, both open and closed loop response, that overshoot happen for open loop response is eliminated and steady-state pressure is accurate enough. © 2008 IEEE.
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Integrating production scheduling and Material Requirements Planning
(2009-09-01)
Masuchun, Ruedee
;
Masuchun, Wiboon
;
Thepmanee, Teerawat
This paper addresses a technique to integrate the production scheduling andMaterial Requirements Planning (MRP). Generally, generating MRP considers onlyBill of Materials (BOM) not capacity constraints and operating sequences leadingto an in-feasible production plan when scheduling is actually performed next onshop-floor. That is why most researchers recently turn attention to executingboth simultaneously. Our technique uses the advantage of an integer linearprogramming model to plan and schedule at once so that the capacity constraintsand operating sequences are not ignored. The objective function of the proposedmodel includes both planning and scheduling purposes that is to minimize totalinventory costs and order's tardiness. Significant and inevitable concerns whenseparately generating MRP and schedule are all included in the model throughseveral constraints. Numerical results verify that this model can be used tosimultaneously generate reasonable MRP as well as feasible and optimal schedule.ICIC International © 2009.
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Impact of time and costs when determining batch size in a supply chain
(2009-11-01)
Masuchun, Ruedee
;
Tirasesth, Kitti
;
Thepmanee, Teerawat
;
Masuchun, Wiboon
;
Shi, Yan
This paper addresses planning a set of jobs on a sequence of machines considering the possibility of producing and delivery in batches either to other stages for further processing or to customers in a supply chain network. Determining batch size at each stage unavoidably is of importance at this point. Using large batch size can put away some costs but time is wasted as trade-off. Small batch size can speed up the process but certain costs are increasing. To represent both time and costs aspects, a nonlinear integer mathematical model with the objective function of minimizing both time and costs simultaneously is studied and applied to determine (production) batch size to match up the flow of production at manufacturer with the demand required at retailers and appro- priate means of shipment (transfer batch size). In view of the fact that time and costs are different in units; this paper furthermore investigates the relationship between them through varying coefficients and parameters. Since this problem is classically NP-hard at each stage of supply chain; the acceptable production and transfer batch sizes are obtained using the advantage of random search approach. The numerical illustrations and results substantiate that the model proposed is useful to simultaneously consider both time and costs when determining batch size at each stage in a supply chain network and it is not necessary to use the same batch size when manufacturing and transferring. Moreover, we found that the conversion factor is statistically robust to the objective function value when the ratio of the production time over the setup time is not high. © 2009 ISSN.

Thepmanee, Teerawat

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