29771764
Low-cost diagnosis of defects in MCM substrate interconnections
Consistent with industry needs for low-cost MCM substrate test methods, we have earlier developed a single-probe technique for detecting near-opens and near-shorts in substrate interconnects. In this paper we show how a fault-dictionary can be used to accurately determine defect location, size, etc. Such information may be used to perform repair of MCM substrates.
45107585
DC Built-In Self-Test for Linear Analog Circuits
DC testing of analog circuits is cheaper than AC testing and covers many fault classes, including some that AC tests cannot detect. This efficient, low-cost, built-in self-test (BIST) methodology uses the checksum encodings of matrix representations to uncover faults that affect a circuit's DC transfer function.
2141308
Integrating wireless LAN and cellular data for the enterprise
The Internet Roaming solution for corporate wireless data users integrates mobile networking across private WLANs, public WLANs, and cellular data networks.
32825020
An exploratory inquiry into the perceived effectiveness of a global information system
As globalization has driven and has also been driven by innovation in information technology (IT), an effective utilization of IT has become critical in improving global operations. In this paper, we report an exploratory inquiry into what factors influence the effectiveness of IT on coordinating international operations as perceived by managers at global firms. As an initial study, our research focuses on a specific set of variables which we propose are fundamental elements for determining the IT effectiveness in the global context, i.e. firm’s globalization level, IT application, and IT department dedication. We put forth two propositions: first, a global firm can enhance its IT effectiveness by advancing the IT application level; second, as its globalization level expands, the global firm must put in place a comparable amount of organizational support (measured by IT department dedication) for the global IT system if it wants to heighten IT performance by raising the IT application level. In order to verify the propositions, we collected survey data from 35 Korean firms, each of which operates on a global scale, doing operations in foreign countries through subsidiaries. Our analysis result led us to reach conclusions upholding the propositions.
16150196
Waste collection vehicle routing problem with time windows
In this paper, we address a real life waste collection vehicle routing problem with time windows (VRPTW) with consideration of multiple disposal trips and drivers' lunch breaks. Solomon's well-known insertion algorithm is extended for the problem. While minimizing the number of vehicles and total traveling time is the major objective of vehicle routing problems in the literature, here we also consider the route compactness and workload balancing of a solution since they are very important aspects in practical applications. In order to improve the route compactness and workload balancing, a capacitated clustering-based waste collection VRPTW algorithm is developed. The proposed algorithms have been successfully implemented and deployed for the real life waste collection problems at Waste Management, Inc. A set of waste collection VRPTW benchmark problems is also presented in this paper.Waste collection problems are frequently considered as arc routing problems without time windows. However, that point of view can be applied only to residential waste collection problems. In the waste collection industry, there are three major areas: commercial waste collection, residential waste collection and roll-on-roll-off. In this paper, we mainly focus on the commercial waste collection problem. The problem can be characterized as a variant of VRPTW since commercial waste collection stops may have time windows. The major variation from a standard VRPTW is due to disposal operations and driver's lunch break. When a vehicle is full, it needs to go to one of the disposal facilities (landfill or transfer station). Each vehicle can, and typically does, make multiple disposal trips per day. The purpose of this paper is to introduce the waste collection VRPTW, benchmark problem sets, and a solution approach for the problem. The proposed algorithms have been successfully implemented and deployed for the real life waste collection problems of Waste Management, the leading provider of comprehensive waste management services in North America with nearly 26,000 collection and transfer vehicles.
2714812
Advections with Significantly Reduced Dissipation and Diffusion
Back and forth error compensation and correction (BFECC) was recently developed for interface computation using a level set method. We show that BFECC can be applied to reduce dissipation and diffusion encountered in a variety of advection steps, such as velocity, smoke density, and image advections on uniform and adaptive grids and on a triangulated surface. BFECC can be implemented trivially as a small modification of the first-order upwind or semi-Lagrangian integration of advection equations. It provides second-order accuracy in both space and time. When applied to level set evolution, BFECC reduces volume loss significantly. We demonstrate the benefits of this approach on image advection and on the simulation of smoke, bubbles in water, and the highly dynamic interaction between water, a solid, and air. We also apply BFECC to dye advection to visualize vector fields
5682535
Power-Efficient Packet Scheduling Method for IEEE 802.15.3 WPAN
Power efficiency is the key issue for mobile devices, which mainly rely on limited battery power. The IEEE 802.15.3 wireless personal area network (WPAN) standard adopts a time division multiple access (TDMA) protocol controlled by a central device to support isochronous traffics. In the TDMA-based wireless packet networks, the packet scheduling algorithm plays a key role in power efficiency. However, the standard suffers from long access delay and association delay which increase the power consumption. In this paper, we propose a packet scheduling method to improve the power efficiency. Performance evaluations are carried out through simulations and significant performance enhancements are observed. Furthermore, the performance of the proposed scheme remains stable regardless of the variable system parameters such as the number of devices and superframe size.