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Assembly and test operations with multipass requirement in semiconductor manufacturingGao, Zhufeng 30 June 2014 (has links)
In semiconductor manufacturing, wafers are grouped into lots and sent to a separate facility for assembly and test (AT) before being shipped to the customer. Up to a dozen operations are required during AT. The facility in which these operations are performed is a reentrant flow shop consisting of several dozen to several hundred machines and up to a thousand specialized tools. Each lot follows a specific route through the facility, perhaps returning to the same machine multiple times. Each step in the route is referred to as a "pass." Lots in work in process (WIP) that have more than a single step remaining in their route are referred to as multi-pass lots. The multi-pass scheduling problem is to determine machine setups, lot assignments and lot sequences to achieve optimal output, as measured by four objectives related to key device shortages, throughput, machine utilization, and makespan, prioritized in this order. The two primary goals of this research are to develop a new formulation for the multipass problem and to design a variety of solution algorithms that can be used for both planning and real-time control. To begin, the basic AT model considering only single-pass scheduling and the previously developed greedy randomized adaptive search procedure (GRASP) along with its extensions are introduced. Then two alternative schemes are proposed to solve the multipass scheduling problem. In the final phase of this research, an efficient procedure is presented for prioritizing machine changeovers in an AT facility on a periodic basis that provides real-time support. In daily planning, target machine-tooling combinations are derived based on work in process, due dates, and backlogs. As machines finish their current lots, they need to be reconfigured to match their targets. The proposed algorithm is designed to run in real time. / text
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Stavebně technologický projekt ayurvédského pavilonu v Počátkách / Construction-technological project of Ayurvedic pavilion in PočátkyLisý, Ondřej January 2020 (has links)
The diploma thesis deals with realization of an Ayurvedic pavilion in the premises of Saint Katerina Resort. The proposed new compound is designed to extend the leisure services of the Saint Katerina Resort in Počátky. The feasibility study of the main technological stages of the project is solved in this diploma thesis. The construction of the object is described in the technical report. Both a detailed itemized budget of the construction and a detailed timetable to show the duration of each process is elaborated for the construction technology project. Futhermore, the design of site construction equipment, design of machine assembly, time deployment of machines and staff balance is elaborated. The project includes a technological regulation of the realization of the skeleton supporting frame structure and both control and test schedule. The work safety for the assembly of the wooden building supporting frame is composed.
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Přístavba objektu pro tělesnou a taktickou přípravu v Brně – stavebně technologický projekt / Extension of the building for physical and tactical training in Brno – construction technological projectŠtípa, David Unknown Date (has links)
The aim of the master thesis is a technological solution of structure for Police of Czech republic. The main aim of the thesis is the support construction and the ceiling contruction. The thesis also includes a site layout with broader relations to traffic routes, budget for the technological procedure, technical report, technical report for site equipment, technological directive for the construction of ceiling and ground works, Inspection and check plan, time schedule, concept of machinery setup and safety and protection of health during work
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