Chhaochharia, Pallav; Graves, Stephen C.
We study inventory allocation and order fulfillment policies among warehouses for low-demand SKUs at an online retailer. A large e-tailer strategically stocks inventory for SKUs with low demand. The motivations are to provide a wide range of selections and faster customer fulfillment service. We assume the e-tailer has the technological capability to manage and control the inventory globally: all warehouses act as one to serve the global demand simultaneously. The e-tailer will utilize its entire inventory, regardless of location, to serve demand. Thus, given the global demand and an order fulfillment policy, there are trade-offs involving inventory holding costs, transshipment...
Kua, C.H.; Lam, Yee Cheong; Rodriguez, I.; Youcef-Toumi, Kamal; Yang, C.
This study presents a technique to manipulate particles in microchannels using arrays of individually excitable electrodes. These electrodes were energized sequentially to form a non-uniform electric field that moved along the microchannel. The non-uniform electric field caused dielectrophoresis to make polarized particles move. This technique was demonstrated using viable yeast cells in a suspending medium with different conductivities. The viable yeast cells experienced positive dielectrophoresis and negative dielectrophoresis in medium conductivity of 21.5 μS/cm and 966 μS/cm respectively. The experimental results indicate that the cells can be transported in either condition using the proposed technique.
Fu, G.; Reading, I.; Li, S.G.; Chaturvedi, P.; Tor, Shu Beng; Yoon, Soon Fatt; Fang, Z.P.; Youcef-Toumi, Kamal
The mass production of components with dimensions in the micron and sub-micron range is anticipated to be one of the leading technology areas for the present century and to be of high market potential. Micro metal injection molding (μMIM) has the potential to be an important contributor to this industry as it can produce precise metallic microstructures in large quantities at a relatively low production cost. The μMIM process is a miniaturization of metal injection molding (MIM) methods. The process comprises of four main steps: mixing, injection molding, debinding and sintering. A metallic powder is mixed with a binder system...
Tor, Shu Beng; Loh, N.H.; Fu, G.; Tay, B.Y.
In this paper experimental study on the demolding force needed to eject micro structures in Micro Metal Injection
Molding (μMIM) is conducted. Injection molding is done on a variotherm mold mounted on a Battenfeld injection molding machine and demolding force measurement is done on an Instron tensile testing machine. Green part is a round disc of φ16 mm and thickness 1.5 mm with an array of φ100 μm × height 200 μm micro structures at the center. The experimental results are in good accordance with the previous analysis results.
Tajan, John Benedict Cheng; Sivakumar, Appa Iyer; Gershwin, Stanley B.
Consider a two-stage manufacturing system composed of a batch processor and its upstream feeder processor. Jobs exit the feeder processor and join a queue in front of the batch processor, where they wait to be processed. The batch processor has a finite capacity Q, and the processing time is independent of the number of jobs loaded into the batch processor. In certain manufacturing systems (including semiconductor wafer fabrication), a processing time window exists from the time the job exits the feeder processor till the time it enters the batch processor. If the batch processor has not started processing a job...
Loke, Y.W.; Tor, Shu Beng; Chun, Jung-Hoon; Loh, N.H.; Hardt, David E.
There is shift in trend towards the use of high quality polymers as the base material in manufacturing microfluidic chips. In this paper, an amorphous metallic alloy mold insert was used in a micro injection-molding process to fabricate microfluidic features onto cyclic-olefin-copolymer (COC) material. The insert and fabricated samples were compared in terms of the geometry and surface roughness attained. Findings indicate that replication, in general, was possible but the microfeatures formed had significant flashing and tearing at the edges.