J. C. Chen's research while affiliated with National Sun Yat-sen University and other places
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Publications (25)
Lithium tantalate (LT) single-crystalline fibers with various growth conditions were obtained using the laser-heated pedestal growth (LHPG) method. The fibers can be produced with a diameter down to 70 µm and tens of centimetres in length by using different pulling rates. Preliminary experiments also showed that the LT fibers can be electrically po...
The operations of the semiconductor final test industry are complicated and characterized by multiple-resource constraints that require simultaneous considerations. One of the most challenging production-planning decisions in the industry concerns an efficient allocation of resources that results in high manufacturing performance. Firms in the indu...
Uncertain and lumpy demand forces capacity planners to maximize the profit of individual factory by simultaneously taking advantage of outsourcing to and/or being outsourced from its supply chain and even competitors. This study develops a resource-planning model of a large manufacturer with two profit-centered factories. The proposed model enables...
Resource portfolio planning optimization is crucial to high-tech manufacturing industries. One of the most important characteristics of such a problem is intensive investment and risk in demands. In this study, a nonlinear stochastic optimization model is developed to maximize the expected profit under demand uncertainty. For solution efficiency, a...
This paper develops a scheduling algorithm for the job shop scheduling problem with parallel machines and reentrant process.
This algorithm includes two major modules: the machine selection module (MSM) and the operation scheduling module (OSM). An
order has several jobs and each job has several operations in a hierarchical structure. The MSM helps...
Yb:YAG crystal fiber was fabricated by laser-heated pedestal growth method for the first time. It was applied in a multi-pass ring laser with 54.7% slope efficiency, which is higher than 50.3% of using bulk YbYAG.
This paper proposes a heuristic, tabu-disturbance algorithm (TDA), to efficiently and effectively solve vehicle routing problem with time window constraints (VRPTW). TDA integrates tabu search (TS) and noising method (NM). TS is one of the most popular generic heuristics in solving VRPHTW in recent years and NM is a combinatorial optimization meta-...
The investment on facilities for manufacturing high-tech products requires a large amount of capital. Even though the demands of such products change dramatically, a company is forced to implement some make-to-stock policies apart from a regular make-to-order production, so that the capacity of expensive resources can be highly utilized. The inhere...
Broadband emission was generated with a 3-dB bandwidth of 406 nm at a center wavelength of 1140 nm by chromium doped fiber. This broadband emission is attributed to emission centers of Cr3+ in high-field site (HFS) and Cr4+ in both HFS and low-field site (LFS) when excited by 900-nm pumping wavelength
Portfolio optimization is an important research field in modern finance. The most important characteristic within this optimization problem is the risk of the returns. In this paper, a non-linear stochastic optimization algorithm named Stochastic Portfolio Genetic Algorithm (SPGA) is proposed to determine a profitable portfolio selection planning p...
In the fast-changing business environment, supply chains are affected by the production and inventory strategies, which influence the amount of information needed by the chains. The firms must therefore determine the best supply chain inventory strategies for their products. The lack of precise market demand and reliable supplier's stock level make...
One of the most challenging production decisions in the semiconductor testing industry is to select the most appropriate dispatching rule which can be employed on the shop floor to achieve high manufacturing performance against a changing environment. Job dispatching in the semiconductor final testing industry is severely constrained by many resour...
The microstructures of Cr4+:YAG crystal fibers grown along [111] direction by laser-heated pedestal growth method were studied by optical and analytical electron microscopy. Curved growth ledges were found on the round side surface of the fiber grown at a relatively high speed. In contrast, nonepitaxial Cr3−δO4 crystallites with spinel-type structu...
Up to 16-dB of gross gain at a wavelength of 1.47 μm was achieved by a broadband Cr<sup>4+</sup>:YAG fiber amplifier. The simulation indicates that the minimum noise figure is close to 3-dB at 1.24-1.6 μm range.
A company needs to implement several make-to-stock policies apart from a regular make-to-order production, so that the capacity
of expensive resources can be fully utilized. The constraints to be considered in such capacity planning problem include finite
budget for investing resources, lump demands of customers, decline of products price with time...
A novel double-clad Cr4+:YAG crystal fiber is demonstrated by use of a codrawing laser-heated pedestal growth method. Up to 10 dB of gross gain at a wavelength of 1.52 microm is achieved at a pump power of 0.83 W, which, to our knowledge, is the first Cr4+-doped fiber amplifier in the optical fiber communication band.
The planar constraint solving is an important application in CAD/CAM. This paper illustrates planar constraint solving problem using point, circle, line, Bezier curve as basic geometric objects. In order to find solutions for cluster merge problem in constraint solving, the applications of cyclographic maps need to be treated not only in geometric...
Process specifications in wafer fabrication need precise definition. Moreover, concerns for quality are such that different steps requiring the same capabilities should be processed on the same equipment with these capabilities. This paper develops a Loading Allocation algorithm considering equipment Capability and Dedication (LACD) for wafer fab....
A dynamic state-dependent dispatching (DSDD) heuristic for a wafer fabrication plant is presented. The DSDD heuristic dynamically uses different dispatching rules according to the state of a production system. Rather than developing new rules, the DSDD heuristic combines and modifies existing rules. This heuristic first classifies workstations into...
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Confocal and electron microscopic observations of willemite (α-Zn2SiO4) crystalline ware glaze, fired to 1270 °C and then aged at 1080 °C for 5 h, indicated the glaze decomposed as (Zn, Ti, Ca)-rich and (Si, Al, K, Na)-rich regions, from which willemite crystallites and amorphous droplets were formed, respectively. Under the constraint of the glaze...
Double-clad Cr/sup 4+/:YAG crystal fiber is demonstrated by a co-drawing laser-heated pedestal growth method. Up to 913 /spl mu/m of super-wideband amplified spontaneous emission was generated at the optical fiber communication band with a 3-dB bandwidth of 265 nm.
We have demonstrated the use of confocal fluorescent microscopy in mapping the Cr+3 profile within the YAG crystal fiber. A sensitivity of 1.0×1017/cm3 was achieved, which is more than an order of magnitude better than that of electron probe microanalysis.
A novel electrically assisted thermal poling technique was developed to fabricate nonlinear photonic crystal fibers. Domain period of 18.9 μm was achieved with a length of more than 10 cm, which can be used as wavelength converter covering both C and L optical communication bands.
Citations
... A crystal fiber has the advantages over a bulk material including better mode confinement and heat dissipation. Various crystal fibers with either single-or double-cladding structures have been fabricated using the co-drawing laser-heated pedestal growth (LHPG) method for coherent and incoherent light sources [1][2][3]. Although the core diameter can be as small as 10 m or less, the crystal fibers are still highly multi-mode because of its large numerical aperture (NA) [3,4]. ...
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... The subsequent construction phase solves small systems of algebraic equations, and for 2D solvers with a focused scope these systems are easy to solve and numerically stable. However, the construction phase becomes demanding when one considers including variable-radius circles and extends the geometric vocabulary to include entities such as PH curves or conics; e.g., [2],[3],[6],[7],[8],[11]. For such constructions, the dominant algebraic approach delivers systems of equations that may require substantial computations as well as generating many solutions, not all of them of geometric significance. ...
... This time window is the interval time for customer to be served. Kim and Sahoo [2], Balakrishnan [3], Chen et al. [4] and Min [5] classified time window into two; soft and hard time window. In soft time window (VRPSTW), a vehicle can break customer's time window with penalty cost included. ...
... However, in a re-entrant production line, various parts with different processing requirements need to be processed at the same station and predicting the arrival of a product is difficult [11]. Conventionally, re-entry production systems on actual shop floors are operated using a single priority-based dispatching rule, owing to the complexity of a re-entrant production line [12,13]. ...
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... In terms of combining existing heuristic scheduling rules, Wang et al. (2005) proposed a method combining decision trees and neural networks, which mined heuristic scheduling rule selection mechanism from scheduling-related historical data. This selection mechanism can obtain the most suitable heuristic scheduling rules in the current environment. ...
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... The fiber's lateral surfaces always contain some lumps, as shown in Fig. 5. Considering that the undoped sapphire fiber's surfaces are very smooth, so it was believed to be the lumps on the Ti:Al 2 O 3 fibers' surfaces are resulted by the titanium segregation. Such phenomena as micrometer-sized particles are similar with the Cr-rich particles in Cr-YAG fibers [28]. ...
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... One of the main advantages of Evolutionary Computation lies in its strength to tackle multi-objective formulations, as shown by the applications of Multi Objective Evolutionary Algorithms (MOEAs), see, e.g. Streichert et al. (2004a), Streichert et al. (2004b), Streichert et al. (2004c) and Lin et al. (2001), Diosan (2005) in the context of multi-objective portfolio selection problems; also single-objective formulations have been devised (Chang et al. 2000;Xia et al. 2000;di Tollo and Roli 2008;Wang et al. 2006), even though it has been reported that single-objective formulations are less apt to embed users' preferences (Subbu et al. 2005). ...
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... Four, six and eight enterprises are simulated as a CN because it would be difficult to benefit from the collaboration when CN is formed by a large number of enterprises; this is because its coordination cost can increase exponentially. Because a large-scale CN seems unrealistic, most CN research assumes that the number of enterprises in CN is fewer than six enterprises (Chen et al., 2008;Renna and Argoneto, 2011;Nof, 2010, 2011;Moghaddam and Nof, 2014;Seok and Nof, 2014b). In this research, therefore, the number of enterprises in CN is assumed to be [4,6,8]. ...
... It is well known that pure forsterite has an isoelectric point (IEP) when pH is 4.4 which means the forsterite nanoparticles surface charge becomes neutral at this pH value [63]. On the other side, pure willemite has an IEP near 7.4 and ZnO solely has an IEP of 9-10 proving the high potential of Zn to direct the zeta potential of pure forsterite towards positive values [64]. Based on the mentioned concept, it can be deduced that the substitution of Zn 2+ instead of Mg 2+ up to 1 mol. ...
... Initialization: In the case of a cold start, in which the system is completely unloaded, and a set of jobs has been collected and are ready to be executed (e.g., during the night, the production line does not work and arriving orders are collected), we initialize the order of the jobs according to the longest processing first policy since it has been shown to improve the makespan compared other policies [30]. We define the processing time of a job as the sum of the processing time of its tasks. ...
