Kok Choon Tan

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This paper develops high performance system identification and linearisation techniques, using a genetic algorithm. The algorithm is fine tuned by simulated annealing, which yields a faster convergence and a more accurate search. This global search technique is used to identify the parameters of a system described by an ARMAX model in the presence of white(More)
Seaport container terminals are essential nodes in sea cargo transportation networks. As such, the operational efficiency of container terminals in handling containers passing through them plays a critical role in a globalized world economy. Many models and algorithms have been developed to address various decision problems in container terminals to help(More)
This paper develops a parallel evolutionary algorithm based design unification of linear control systems in both the time and the frequency domains under performance satisfactions. A speedup of near-linear pipelinability is observed for the parallelism implemented on a network of transputers of Parsytec SuperCluster. The approach is capable of tackling(More)
0377-2217/$ see front matter 2012 Elsevier B.V. A http://dx.doi.org/10.1016/j.ejor.2012.03.011 ⇑ Corresponding author. Tel.: +65 65162895; fax: + E-mail addresses: xinjia@nus.edu.sg (X. Jiang), is isecep@nus.edu.sg (E.P. Chew), hanyongbin@nus.edu. du.sg (K.C. Tan). This paper studies the storage yard management problem in a busy transshipment hub, where(More)
The functional relationship between sexually dimorphic neural populations and sex differences in reproductive functioning is unclear. The present study has investigated the function of the sexually dimorphic, estrogen-receptive, calcitonin gene-related peptide (CGRP) neurones in the female preoptic area by examining patterns of Fos immunoreactivity within(More)
I-A+ epidermal antigen-presenting cells (APCs, Langerhans cells) have been shown to present tumor-associated antigens (TAAs) and to induce tumor immunity in vivo. This study examined the effects of ultraviolet radiation (UVR) and the cytokines granulocyte-macrophage colony-stimulating factor (GM-CSF) and tumor necrosis factor alpha (TNF-alpha) on the(More)
Intravenous administration of hapten-coupled epidermal cells (EC) induces tolerance in mice. To assess the relevance of this observation to cutaneous tumors, the ability of EC to induce tolerance to the S1509a spindle cell tumor (H-2a) was examined. ECs were prepared from CAF1 (H-2a/d) mice and the supernatant from a freeze-thaw lysate of S1509a cells was(More)
In this paper, we investigate how two main factors affect the efficiency of the port operation. The two main factors are type of transport vehicles and layout of the storage yard. Two different types of transport vehicles (i.e., prime mover and shuttle carrier) and two different types of layouts (i.e., with or without chassis lane beside the container(More)
Actuators used in hard disk drives (HDD) are produced en mass and therefore their dynamic properties vary within a given tolerance bound. A nominal model representing the batch of actuators is used to design the head positioning servomechanism. Equal performance can not be expected for all actuators when such controller is used. Disk drive servomechanism is(More)