Browsing by Author "Chiang, WC"

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Microcrystallinity of undoped amorphous silicon films and its effects on the transfer characteristics of thin film transistors
(1995-01-01)
Liang, CW
;
Chiang, WC
;
Feng, MS
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
Microcrystallinity of undoped amorphous silicon films and its effects on the transfer characteristics of thin-film transistors
(1995-11-01)
Liang, CW
;
Chiang, WC
;
Feng, MS
;
材料科學與工程學系
;
電控工程研究所
The microcrystallinity of hydrogenated amorphous silicon films deposited by the conventional radio-frequency plasma-enhanced chemical vapor deposition (rf-PECVD) method and its dependence on chamber pressure are discussed. In a wide range of pressure at which the microcrystalline film can be formed, a critical pressure (500 mT) is found. Films deposited at this critical pressure possess the highest crystalline volume fraction and the smallest grain size. An ion-bombardment-assisted model is proposed to explain the experimental results. Concerning the applications of microcrystalline films to thin-film transistors (TFTs), the subthreshold swing and the field effect mobility are studied, both of which are found to be smaller than those of the hydrogenated amorphous silicon (a-Si:H) TFTs.
Reducing inventory costs by order splitting in the sole sourcing environment
(1996-03-01)
Chiang, C
;
Chiang, WC
;
管理科學系
;
Department of Management Science
In this paper, we examine the possibility of the arrangement for multiple deliveries in each order cycle for the continuous review inventory system. The problem is mainly found in the retail sector where inventory often makes up the majority of a company's assets. Most works recently have focused on the reduction of safety stock in the multiple sourcing setting. This research, instead, considers the reduction of cycle stock in the sole sourcing environment. The formulation where a predetermined service level serves as a constraint for the objective function is employed throughout this research. We show that splitting the order into multiple deliveries can significantly reduce the inventory carrying cost especially when the interarrival times between deliveries are determined optimally.