Production and employment scheduling in multistage production systems

Lanzenauer, Christoph Haehling von

doi:10.1002/nav.3800170206

Cited by 26 publications

(7 citation statements)

References 5 publications

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Section: It Is Important To Observe That If N ( T ) / P ( T ) > K Tmentioning

confidence: 81%

“…(1) It implies that each individual reaches a productive level after spending L time units on the program, thus ignoring the fact that some new hires never become productive; and (2) It ignores the fact that while an individual is being trained and indoctrinated he can make a meaningful contribution to the program and thus, in a sense, be productive even though not perhaps productive at the level for which he was hired.…”

Section: Learning and Worker Productivitymentioning

confidence: 99%

“…Jewett [3] assumes a constant efficiency factor for experienced, new, overtime, and subcontracted workers, but these factors are independent of the time period. In contrast to this, Haehling von Lanzenauer [2] assumes constant worker productivity for each time period, and Lundgren and Schneider [ LEI consider the situation where a new hire has efficiency ei in the ith time period, where el ez s . .…”

Section: Efficiency Of a Productive Workermentioning

confidence: 99%

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A model for manpower productivity during organization growth

Rau¹

1971

Naval Research Logistics

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A mathematical model is developed that enables organization and manpower planners to quantify the inefficiencies involved in rapid buildups of organizations, such as is frequently found in the aerospace industry shortly after the award of a major contract. Consideration is given to the time required to train. irdoctrinate, and familiarize new workers with their jobs and the general program aspects. e n c e trained, workers are assumed to be productive. If the ratio of untrained to trained workers exceeds a critical value, called the buildup threshold, then the performance of the trained workers is degraded to the extent that they are no longer 100 percent efficient until this ratio returns to a value less than the threshold. The model is sufficiently general to consider an arbitrary manpower plan with more than one peak or valley. The model outputs are functions of real time and consist of the fraction of the total labor force which is productive, the fraction of the total labor units expended for nonproductive effort, the cumulative labor costs for productive effort, and the cumulative labor cost for all effort.

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Section: It Is Important To Observe That If N ( T ) / P ( T ) > K Tmentioning

confidence: 81%

Section: Learning and Worker Productivitymentioning

confidence: 99%

Section: Efficiency Of a Productive Workermentioning

confidence: 99%

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A model for manpower productivity during organization growth

Rau¹

1971

Naval Research Logistics

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“…One of the first models presented in supply chain management is a model that Hansmann and Hess (1960) developed, which introduced a model based on linear programming approach using linear cost of decision variables. Then, Van Lanzenauer (1970) developed the model of Hansmann and Hess for multistage and multi-product manufacturing systems and made decisions with regard to capacity constraints. Govindan et al (2015) presented a comprehensive review in the area of reverse logistics and closed-loop supply chains to explore future researches.…”

Section: Literature Reviewmentioning

confidence: 99%

Design of Closed Loop Supply Chain of Wood Plastic Composite (WPC) Industry

Doustmohammadi¹,

Babazadeh²

2019

J ENVIRON INFORM

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Substituting woody products with wood plastic composite (WPC) products has attracted many interests in recent years. This article seeks to provide an approach to construct a reliable network of closed loop supply chain (CLSC) facilities for WPC industry. The WPC products could be thoroughly collected and recycled and used as raw material for producing new products. In this paper, a mathematical model has been developed that involves deciding direct and reverse flows in the supply chain. The proposed model is mixed Integer linear Programming (MILP) one which minimizes total costs including opening facilities, production, distribution, collection and recycling costs in the forward and reverse sides of the CLSC. The proposed model is applied in a real case of production WPC doors. Sensitivity analysis is performed to evaluate the behavior of the model respect to the changes of the important parameters. The acquired results confirm the applicability of the proposed MILP model in designing real CLSCs.

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“…Hierdie model is ook getoets op 'n stel hipotetiese data'. vir alle j, n en t. (6) In hierdie vergelyking word die kapasiteite R I en Qi 1 wat deur Von Lanzenauer gedefinieer is, duidetf ker omskryf. Dit word hier uitgedruk as die totale standaardtye (in standaardmasjienminute) wat per periode per departement beskikbaar is.…”

Section: Die Probleem Van Taktiese Produksiebeplannlng (Tpb)unclassified

Taktiese produksiebeplanning met behulp van lineere programmering: 'n Praktiese toepassing

Meij¹

1979

SAJBM

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In this paper a linear programming (LP) model for aggregate production planning is given. This is a general model that can be used in various production situations. It optimizes the monthly planning of human resources, production quantities and inventories on the medium term (e.g. a 12 month planning horizon) for a multi-department, multi-product production facility. A computer programme was developed for the model, making use of a standard LP package. In practical applications savings of up to 33% of variable cost were obtained.In hierdie artikel word 'n lineere programmeringsmodel (LP) vir aggregaat-produksiebeplanning gegee. Dit is 'n algemene model wat in 'n verskeidenheid van produksiesituasies gebruik kan word. Dit optimiseer die maandelikse beplanning van mannekrag, produksiehoeveelhede, en voorrade op die mediumtermyn (bv. 'n beplanningshorison van 12 maande) vir 'n multi-departementele, multi-produk-produksiefasiliteit. 'n Rekenaarprogram is vir die model ontwikkel, wat van 'n standaard LP-pakket gebruik maak. In praktiese toepassings is besparings van tot 33% van veranderlike koste verkry.

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Production and employment scheduling in multistage production systems

Cited by 26 publications

References 5 publications

A model for manpower productivity during organization growth

A model for manpower productivity during organization growth

Design of Closed Loop Supply Chain of Wood Plastic Composite (WPC) Industry

Taktiese produksiebeplanning met behulp van lineere programmering: 'n Praktiese toepassing

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