We consider a single-server queueing system with Poisson arrivals and general service times. While the server is up, it is subject to breakdowns according to a Poisson process. When the server breaks down, we may either repair the server immediately or postpone the repair until some future point in time. The operating costs of the system include customer holding costs, repair costs and running ...

since the emergence of the process-oriented approach in second language writing instruction, the issues of writing instruction have been predominantly concerned with what and how error feedback should be given to the students’ writing. the present study investigated the effect of explicit corrective feedback on writing accuracy of iranian intermediate efl learners (n = 44) in hamedan islamic az...

Pattern-based design, the use of design pattern during the design process, has become widely used in the object-oriented community because of the reuse benefits. However, design pattern defects can be injected in design maintenance phase because the changes of pattern-based design require the conformance not only to the change requirements but also to the corresponding design patterns. This pro...

In industrial manufacturing, there are techniques that can identify certain risks in the processes cause inconsistencies operation of equipment, hazards for operator and waste. One supports engineering company Preventive Maintenance (PM) tasks focus their efforts on analyzing critical devices could degrade quality products obtained. Companies have an average system attention to machinery equipm...

The extant safety literature suggests that managerial Safety Leadership is vital to the success and maintenance of a behavioral safety process. The current paper explores the role of Managerial Safety Leadership behaviors in the success of a behavioral safety intervention ill the Middle-East with 47,000 workers from multiple nationalities employed by fourteen sub-contractors and one main contra...

The most common means of correcting refractive errors is with spectacles. Spectacles are prescribed and dispensed with corrective lenses that give the best visual acuity and are comfortable. Custom-made spectacles (i.e., made up for each individual) are more expensive, but they are essential in some cases, i.e., when a person requires astigmatic correction or needs diff erent power lenses in ea...

For repairable items under the two-dimensional warranty, the manufacturer expenses warranty costs for rectifying the failures occurring over the warranty coverage. Preventive maintenance actions reduce the occurrence intensity of item failures, and hence the warranty cost resulted from corrective maintenance, but bring additional preventive maintenance cost. In this paper, we investigate a peri...

Mesin-mesin di PT IJK bekerja selama 22 jam setiap hari untuk memenuhi kebutuhan konsumen yang tinggi. Sehingga perlu dilakukan perawatan mesin, menerapkan corrective maintenance dan juga preventive pada beberapa mesin saja. Tujuan dari penelitian ini ada dua. Pertama adalah membuat penjadwalan maintenance. Kedua mengetahui potensi kegagalan jenis tindakan perawatan. Penelitian divisi refrigera...