Browsing by Author "FANG, CY"

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GRAPHICAL DETERMINATION OF MONOMER SHIFT, DIMER SHIFT AND DIMERIZATION CONSTANT FOR SELF-ASSOCIATION - 2-ISOPROPYL PHENOL IN C6D12 AS AN EXAMPLE
(1995-06-01)
CHEN, JS
;
SHIAU, JC
;
FANG, CY
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交大名義發表
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應用化學系
We propose a graphical method to treat dilution shift in NMR spectra to determine the monomer shift, dimer shift and dimerization constant simultaneously and consistently for the system of monomer/dimer equilibrium. The salient features include avoiding error-prone manual extrapolation to zero concentration to obtain a monomer shift, and providing consistent assessment and error estimation for the determination. The dilution shifts of 2-isopropyl phenol in C6D12 serve to demonstrate this graphical method. The enthalpy and entropy of dimerization are determined via a van't Hoff plot from the temperature variation of the dimerization constant.
USING THE VIRTUAL CELL CONCEPT FOR SHORT-TERM PRODUCTION PLANNING FOR FLEXIBLE JOB-SHOP MANUFACTURING SYSTEMS
(1993-07-01)
CHUNG, SH
;
FANG, CY
;
交大名義發表
;
工業工程與管理學系
;
National Chiao Tung University
Short-term production planning (STPP) problems in flexible job shop manufacturing systems (FJSMS), which consist of computerized numerically controlled (CNC) machines and dedicated machines, are discussed here. Short-term production planning problems of FJSMS include part type selection, process selection, batch sizing and part family/machine group formation. A proposed STPP system for FJSMS is developed for cases where production contents are frequently changed thus resulting in the physical machine layout being not justified. It mainly adopts a restricted-period planning approach, using a virtual cell's concept for solving the STPP problem. The planning goal of STPP is to satisfy quantity and due date requirements as determined by MRP/CRP, with due consideration to the features of NC machines and dedicated machines.