This paper presents a control synthesis approach for discrete event systems modelled by ordinary Petri Nets (PN) to solve a forbidden state problem. The PN herein considered are transitions controllable and contain measurable and non measurable transitions. The proposed PN controller is synthesised using the influence paths of the forbidden transitions. The latter are deduced from the PN reacha...

BACKGROUND Effective reduction of malaria morbidity and mortality in Nigerian children under the age of five depends to a large extent on family biosocial factors. Although, the awareness of insecticide treated bed nets (ITNs) is reportedly high and increasing in Nigeria there remain large gaps between awareness, possession and use by families with children under the age of five in Nigeria. A...

INTRODUCTION DDT is considered to be the most cost-effective insecticide for combating malaria. However, it is also the most environmentally persistent and can pose risks to human health when sprayed indoors. Therefore, the use of DDT for vector control remains controversial. METHODS In this paper we develop a computer-based simulation model to assess some of the costs and benefits of the con...

in this work, we developed a method which combined the processes of acid-leaching, ammonium jarosite precipitating and electro-depositing to recover copper and nickel from electroplating sludge. residual sludge from an electroplating plant located in qingdao was used for acid-leaching, and more than 95% of copper, nickel, zinc, chromium and iron were extracted from the sludge. after acid-leachi...

Effective interventions exist to break this cycle, like insecticide treated bednets (ITN) and intermittent preventive treatment of malaria during pregnancy (IPTp). In recent years, increased attention to and funding for malaria control has resulted in a significant improvement in the coverage of malaria interventions, particularly for children. Further reduction of the burden of malaria and mal...

Results: The overall coverage of DDT was low (25.3%). Coverage was slightly better among tribal households (31.3%) compared to non-tribal population (19.4%). The acceptance of DDT spray was found to be significantly associated with knowledge about mode of transmission of malaria and type of house. Room-wise coverage was not as per norms. Refusal of DDT was seen more among non-tribal communities...

The mathematical structures known as Petri Nets have recently become the focus of much research effort in both the structural and quantitative analysis of all kinds of biological networks. This review provides a very brief summary of these interesting new research directions.