We consider a single-machine scheduling problem with each job having an uncertain processing time which can take any real value within each corresponding closed interval before completing the job. The scheduling objective is to minimize the total weighted flow time of all n jobs, where there is a weight associated with each job. We establish the necessary and sufficient condition for the existe...

We study the off-line broadcast scheduling problem to minimize total (or average) flow time. Assume the server has k pages and the requests arrive at n distinct times, we give the first algorithm to find the optimal schedule for the server with a single channel, in O(k3(n+k)k−1) time. For m-channel case, i.e., the server can broadcast m different pages at a time where m < k, we find the optimal...

Article history: Received 14 November 2007 Received in revised form 19 June 2008 Available online xxxx Communicated by W. Zhao

extensive flood damages all over the world necessitate its control and operation. hydrologic impacts of land use change appear in many ways such as total runoff, and flood peak flow. this study was performed in 2014 and aimed to investigate the impacts of land use changes on the occurrence of floods in the catchment of boostan dam in golestan province, iran. for this purpose, watershed modeling...

background:the dynamic binding capacity (dbc) of a chromatography matrix in protein purification is the amount of the total protein absorbed into the matrix, before occurrence of a significant break in the breakthrough curve. optimization of the process criteria for maximum dbc avoids extra process scale-up and reduces the processing time, costs and protein loss. taguchi method is a simple usef...

Background: Overcrowding is an important problem for outpatient services in healthcare facilities. Patient flow analysis (PFA) is a useful method for identifying inefficiencies in and facilitating patient flow. Objective: PFA was used to estimate patient wait time and determine how different clinical disciplines impact wait times in the studied hospital.<...

3. The HIPC-Initiative, Fiscal Ownership and the Quality of Aid 3.1. The Quantitative and Qualitative Impact of the HIPC-Initiative 3.2. Impact on Resource Flows: The Debt Reduction Dividend 3.2.1. Measuring the Amount of Virtual Resources 3.2.2. Additionality 3.2.3. Debt Overhang 3.2.4. Debt Sustainability 3.3. Impact on Poverty Reduction and Aid Effectiveness 3.3.1. Channeling Debt Relief int...