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Comparative Study of GPS-Integrated Concrete Supply Management using Discrete Event Simulation
Zekavat, Payam Rahnamayie,Mortaheb, Mohammad Mehdi,Han, Sangwon,Bernold, Leonhard Korea Institute of Construction Engineering and Ma 2014 Journal of construction engineering and project ma Vol.4 No.2
The management of vehicular supply of "perishable" construction material, such as concrete mixes, faces a series of uncertainties such as weather, daily traffic patterns and accidents. Presented in this paper is a logistics control model for managing a hauling fleet with interrelated processes at both ends and queue capacities. Discrete event simulation is used to model the complex interactions of production units and the randomness of the real world. Two alternative strategies for ready mix concrete delivery, with and without an off-site waiting queue, are studied to compare supply performance. Secondly, the paper discusses the effect of an agent-based GPS tracking system providing real-time travel data that lessens the uncertainty of trucking time. The results show that the combination of GPS information with off-site queuing reduces productivity loss and process wastes of concrete placement as well as the idleness of supply trucks when crew or pump experience an unexpected stoppage.
Li, Xiukui,Zekavat, Seyed A. (Reza) The Korea Institute of Information and Commucation 2009 Journal of communications and networks Vol.11 No.2
In this paper, a technique is proposed that enables secondary users to evaluate channel availability in cognitive radio networks. Here, secondary users estimate the utilization of channels via predicting the traffic pattern of primary user, and select a proper channel for radio transmission. The proposed technique reduces the channel switching rate of secondary users (the rate of switching from one channel to another) and the interference on primary users, while maintaining a reasonable call blocking rate of secondary users.
Dynamic Control of Resource Logistics Quality to Eliminate Process Waste in Rebar Placement Work
Sungkon Moon,Payam R. Zekavat,Leonhard E. Bernold,Pekka Leviakangas 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.10
Output-oriented resource control in the traditional planning methods is still prevalent in construction industry. It frequently causes unpredictable wastes leading to deterioration of the sequenced supply chains. On the other hand, the use of feed-forward control offers the opportunity for prevention by ensuring the high quality of necessary process resources. This paper, in turn, presents a dynamic control approach that highlights the effectiveness of feed-forward control on minimising process wastes. The field experiment in this paper presents the rebar supply and placement on an actual construction site. It aims to measure the responsiveness of pre-controlled resources to ever-changing process performance. Collected data during this field study provided the basic data for establishing statistical relationships between resource logistics quality and process performance. The research experiments found out two of the critical resource logistics: (1) Available number of workers; and (2) Distance between resource and final place. Finally the proactive control on these entities resulted in a dramatic reduction of process waste, leading to the improvement of productive work rate (31.0 to 53.3%). The main contribution of the research lies on the first-hand investigation from a very probable situation, which would benefit practical engineers and construction managers.
Xiukui Li,Seyed A. (Reza) Zekavat 한국통신학회 2009 Journal of communications and networks Vol.11 No.2
In this paper, a technique is proposed that enables secondary users to evaluate channel availability in cognitive radio networks. Here, secondary users estimate the utilization of channels via predicting the traffic pattern of primary user, and select a proper channel for radio transmission. The proposed technique reduces the channel switching rate of secondary users (the rate of switching from one channel to another) and the interference on primary users, while maintaining a reasonable call blocking rate of secondary users.
Phenotypic Characterization of Genetically Lowered Human Lipoprotein(a) Levels
CHARGE-Heart Failure Consortium,CARDIoGRAM Exome Consortium,Emdin, C.A.,Khera, A.V.,Natarajan, P.,Klarin, D.,Won, H.H.,Peloso, G.M.,Stitziel, N.O.,Nomura, A.,Zekavat, S.M.,Bick, A.G.,Gupta, N.,Asselta Elsevier Inc. 2016 Journal of the American College of Cardiology Vol.68 No.25
<P>CONCLUSIONS Beyond CHD, genetically lowered Lp(a) levels are associated with a lower risk of peripheral vascular disease, stroke, heart failure, and aortic stenosis. As such, pharmacological lowering of plasma Lp(a) may influence a range of atherosclerosis-related diseases. (C) 2016 by the American College of Cardiology Foundation.</P>
Nomura, Akihiro,Won, Hong-Hee,Khera, Amit V.,Takeuchi, Fumihiko,Ito, Kaoru,McCarthy, Shane,Emdin, Connor A.,Klarin, Derek,Natarajan, Pradeep,Zekavat, Seyedeh M.,Gupta, Namrata,Peloso, Gina M.,Borecki, Grune & Stratton 2017 Circulation research Vol.121 No.1
<P>Conclusions: Compared with noncarriers, carriers of PTV at CETP displayed higher high-density lipoprotein cholesterol, lower low-density lipoprotein cholesterol, lower triglycerides, and lower risk for CHD.</P>