CONLOAD---a new lot release rule for semiconductor wafer fabs

Rose, Oliver

doi:10.1145/324138.324535

Cited by 28 publications

(13 citation statements)

References 5 publications

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“…where capacity is evenly distributed across stations, since load balancing across resources is less important in shops with stationary bottleneck(s) (Thürer et al 2017b). Given this focus, ConWIP extensions, such as ConWork or ConLoad (Rose, 1999), that presuppose a stationary bottleneck are not considered when discussing existing refinements. We also do focus on a single shop that provides a high variety of products rather than on an assembly shop where several different ConWIP loops need to be coordinated (see e.g.…”

Section: Background -The Conwip Production Control Systemmentioning

confidence: 99%

On the meaning of ConWIP cards: an assessment by simulation

Thürer

Fernandes

Ziengs

et al. 2019

Journal of Industrial and Production Engineering

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The simplicity of ConWIP (Constant Work-In-Process) makes it one of the most widely adopted card-based production control solutions. Its simplicity however also limits the opportunities that are available to improve the concept. There are arguably only two major search directions: (i) to alter the meaning of cards away from controlling jobs; and (ii) to adopt alternative, more sophisticated backlog sequencing rules. In this study, we outline a simple, practical load-based ConWIP system that changes the meaning of cards. Rather than controlling the number of jobs, cards are associated with a certain amount of workload. Simulation results demonstrate the positive performance impact of limiting the total shop load. The Workload Control literature advocates the use of a corrected load measure as it better represents the direct load queuing at a station; but this worsens performance when compared to a shop load measure in the context of ConWIP.

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Section: Background -The Conwip Production Control Systemmentioning

confidence: 99%

On the meaning of ConWIP cards: an assessment by simulation

Thürer

Fernandes

Ziengs

et al. 2019

Journal of Industrial and Production Engineering

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“…Rose [16] proposed CONLOAD policy, which is an extension of WR policy. CONLOAD compute amount of load for the bottleneck to trigger the release, instead of considering total amount of remaining work for the bottleneck station.…”

Section: Justification For Need Of a New Clrp: Constbwlmentioning

confidence: 99%

“…It shows that the improvement brought by CONSTBWL in the values of the average cycle time and the standard deviation of cycle time over tested CLRPs. For instance, the values in the last two columns of table 16 show that CONSTBWL in combination with SRPT reduce the average cycle time up to 16.72%, 18.31% and 23.43% in relation to WR, CON-LOAD and CONWIP for a given throughput level. The improvements of CONSTBWL over tested CLRPS for the average cycle time are statistically significant for most of the cases.…”

Section: Insights Into Constbwl Policymentioning

confidence: 99%

Investigation of different inputs and a new release policy in the proposed simulation model for wafer fabrication system

Singh

Mathirajan

2019

Sādhanā

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This paper investigates the effect of different inputs on selected performance metrics such as cycle time, WIP level and throughput in the processes of semiconductor wafer fab by developing a simulation model of representative but fictitious semiconductor wafer fab. The different inputs include arrival rate, arrival distribution, processing time, maintenance schedule, operator schedule, batch size, dispatching rule and release policy. Simulation results show that the relationship between inputs and system performance metrics, considered in this study, are extremely complex particularly for the inputs maintenance schedule, operator schedule and batch size. An overall result shows that dispatching rule and closed loop release policy can significamtly improve the performance of wafer fabrication system. However; major improvement comes from closed loop release policy. Accordingly, this paper presents a new closed loop release policy called as constant batch machine workload (CONSTBWL) to improve the performance of wafer fab. The behaviour of CONSTBWL is analysed in combination with dispatching rules using the proposed simulation model for wafer fab. Simulation results show that CONSTBWL policy outperformed traditional release policies in terms of the average cycle time, the work in process (WIP) level and the standard deviation of WIP level under a prescribed throughput level. Furthermore, the analysis of the results indicated that a good shop floor performance can be achieved with a right combination of closed loop release policy and simple dispatching rules with respect to the choice of performance metrics.

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“…As such, some of the existing load-based mechanisms have retained the same control logic of previously existing unit-based mechanisms, but with load-based interpretation of their cards. Examples of such load-based mechanisms are the Constant Load (CONLOAD) [10],…”

Section: Review Of Literature On Related Control Mechanismsmentioning

confidence: 99%

A Nested Configuration of POLCA and Generic Kanban in a High Product Mix Manufacturing System

Olaitan

Fragapane

Alfnes

et al. 2017

IFIP Advances in Information and Communication Technology

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The work presented in this paper is part of a project aimed at streamlining and improving the process flow at a leather furniture manufacturing company. The manufacturing throughput time is highly variable, and this makes planning difficult for the assembly of components at the downstream stages. Throughput time predictability at the upstream stages where the components are manufactured would facilitate the planning of their assembly according to their expected arrival times for specific product models. Research conducted in a previous phase of the project showed that the application of the CONstant Work In Progress (CONWIP) control mechanism to regulate inventory yielded significant improvements in the throughput time's mean and variation. However, as it is the case with tighter control of inventory in manufacturing, previously unrealised problems were exposed in relation to the selection of the product model to release into the CONWIP loop. This has significant impact on the balance of the distribution of workload across the system's workstations and among the multi-skilled teams at one of the workstations. This research implements a nested configuration of the Paired-cell Overlapping Loop Of Cards with Authorisation (POLCA) and the Generic Kanban control mechanisms to achieve a balance of the workloads. This ensures a synchronised flow of the different product mix through the entire manufacturing system.

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CONLOAD---a new lot release rule for semiconductor wafer fabs

Cited by 28 publications

References 5 publications

On the meaning of ConWIP cards: an assessment by simulation

On the meaning of ConWIP cards: an assessment by simulation

Investigation of different inputs and a new release policy in the proposed simulation model for wafer fabrication system

A Nested Configuration of POLCA and Generic Kanban in a High Product Mix Manufacturing System

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