Environmental interactions of the Space Station Freedom electric power system

The Space Station Freedom operates in a low earth orbit (LEO) environment. Such operation results in different potential interactions with the Space Station systems including the Electric Power System (EPS). These potential interactions result in environmental effects which include neutral species effects such as atomic oxygen erosion, effects of micrometeoroid and orbital debris impacts, plasma effects, ionizing radiation, and induced contamination degradation effects. The EPS design and its interactions with the LEO environment are briefly described and the results of analyses and testing programs planned and performed thus far to resolve environmental concerns related to the EPS and its function in LEO environment

Design and Analysis of a Materials Management System for Boeing Commercial Airplanes\u27 (The Boeing Company) Metallic Raw Material Supply Chain with a Focus on Lead Time Manipulation and Corresponding Effects on Inventory and Cost

The purpose of this project is to identify the costs associated with an aggregation strategy run by Boeing Commercial Airplanes. In order to identify these costs, a rudimentary replenishment system must be designed for the supply chain due to the fact that there is currently no such system in place. This replenishment system will be used to create a model (created in Excel) to calculate the total annual costs of the system. The model must allow changes to some of the important inputs such as mill performance measures and lead times and report the resulting changes in the total annual cost. Boeing has contracted out the responsibilities of operating the aggregation strategy to an outside company called TMX Aerospace. TMX operates the system out of warehouses that also act as distribution centers (metal moves from the metal mills to the TMX warehouses and then to the suppliers). Among the many benefits that demand aggregation provides, TMX also provides a service known as lead time manipulation. This service essentially transforms a long lead time from the mills to TMX into a dramatically shorter lead time between TMX and the suppliers. The costs of this service are particularly important for this project. The results of this study will be used to identify an optimal replenishment strategy and the costs of running the operation. In addition, this project will pave the path for a supply chain management software package to be implemented at the distribution center in the future

Peer-to-Peer Networks: A Mechanism Design Approach

In this paper we use mechanism design approach to find the optimal file-sharing mechanism in a peer-to-peer network. This mechanism improves upon existing incentive schemes. In particular, we show that peer-approved scheme is never optimal and service-quality scheme is optimal only under certain circumstances. Moreover, we find that the optimal mechanism can be implemented by a mixture of peer-approved and service-quality schemes.peer-to-peer networks, mechanism design.