Harbor pilots guide large container, bulk, and other cargo ships through congested harbors and dock them under a variety of conditions: night and day, weekends, and all kinds of weather. Harbor pilots are always in one of three states: work, standby, or off. A schedule must reflect the three states in the desired ratios, must conform to federal regulations with respect to consecutive hours worked, and must be perceived as fair and equitable. We have developed a simple heuristic for harbor pilots that generates fair and equitable schedules and satisfies desired off-duty time.
This paper focuses on production activity control (PAC) techniques used in Polish manufacturing companies. Investment in Polish plants by Western European, Japanese, Korean, and US companies raises the question of how ready Polish manufacturing companies are to implement various managerial techniques that have been used for many years in industrialized countries. A survey was sent to over 300 Polish companies. It asked the managers how they deal with typical shop floor control problems such as authorization to start work on an order, determining the sequence at work centers, deciding when to make the schedule and who can make changes in the schedule, adherence to due dates and determining lot sizes. Most of the managers received education from Polish schools and were not taught the principles of modern PAC techniques. The study shows that in many cases the managers learn fast and are in the process of understanding modern shop floor control principles. The research results should help many potential foreign investors to better understand the readiness of Polish manufacturing management to implement modern production planning and control techniques such as MRP, MRPII, or JIT.
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