Blar i UiS Brage på forfatter "Davidrajuh, Reggie"
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A New Modular Petri Net for Modeling Large Discrete-Event Systems: A Proposal Based on the Literature Study
Davidrajuh, Reggie (Peer reviewed; Journal article, 2019)Petri net is a highly useful tool for modeling of discrete-event systems. However, Petri net models of real-life systems are enormous, and their state-spaces are usually of infinite size. Thus, performing analysis on the ... -
Physics-Based Swab and Surge Simulations and the Machine Learning Modeling of Field Telemetry Swab Datasets
Mohammad, Amir; Agonafir, Mesfin Belayneh; Davidrajuh, Reggie (Peer reviewed; Journal article, 2023)Drilling operations are the major cost factor for the oil industry. Appropriately designed operations are essential for successful drilling. Optimized drilling operations also enhance drilling performance and reduce drilling ... -
Planning E-government startup: a case study on E-Sri-Lanka
Davidrajuh, Reggie (Journal article; Peer reviewed, 2004)This paper analyzes the proposed implementation strategies of e-government in Sri Lanka. First, the vision of e-Sri Lanka – the information and communication technology development roadmap to achieve e-governance – is ... -
Prediction of Downhole Pressure while Tripping into wellbore during Drilling Operations using Machine Learning Techniques
Karunakaran, Subankan; Panchalingam, Mithushankar (Master thesis, 2022)Surge and swab pressure occur while tripping in and out, respectively, of a wellbore during drilling operations. High tripping speed can lead to fracturing the well formation, whereas low tripping speed can lead to an ... -
Prediction of Downhole Pressure while Tripping into wellbore during Drilling Operations using Machine Learning Techniques
Karunakaran, Subankan; Panchalingam, Mithushankar (Master thesis, 2022)Surge and swab pressure occur while tripping in and out, respectively, of a wellbore during drilling operations. High tripping speed can lead to fracturing the well formation, whereas low tripping speed can lead to an ... -
Prediksjon av trykk i brønner under boreoperasjoner ved bruk av maskinlæringsteknikker
Grindalen, Jonas; Krøyer, Vebjørn Njåtun (Master thesis, 2023)Denne avhandlingen undersøker bruken av maskinlæring (ML)-algoritmer for prediksjon av trykkstigning og trykksenkning under boring i olje- og gassektoren. Disse trykkene er avgjørende for å opprettholde brønnstabilitet og ... -
Rate of Penetration (ROP) Optimization through Data-Driven Approach
Adnan, Isar (Master thesis, 2023)One method to lower cost and Non-Productive Time (NPT) in drilling wells is to achieve the highest rate of penetration (ROP). ROP is influenced by a variety of factors, including tooth attrition and hole cleaning. Three ... -
Realizing a new e-commerce tool for formation of a virtual enterprise
Davidrajuh, Reggie (Journal article; Peer reviewed, 2003)This paper presents a methodology for the development of a new tool for the formation of a virtual enterprise. The formation phase mainly deals with inviting potential collaborators to virtual enterprise and developing a ... -
Representing Resources in Petri Net Models: Hardwiring or Soft-coding?
Davidrajuh, Reggie (Conference object, 2011)This paper presents an interesting design problem in developing a new tool for discrete-event dynamic systems (DEDS). A new tool known as GPenSIM was developed for modeling and simulation of DEDS; GPenSIM is based on Petri ... -
Revisiting Petri Net Modeling of the Cigarette Smokers' Problem: A GPenSIM Approach
Davidrajuh, Reggie (Conference object, 2013-11)Petri Nets is a family of modeling formalisms, with different interpretations and abstraction levels; the Petri nets family of modeling formalisms includes ordinary Petri Net, generalized Petri Net, and also all other ... -
A service-oriented approach for developing adaptive distribution chain
Davidrajuh, Reggie (Journal article; Peer reviewed, 2007)This paper presents a service-oriented approach for development of adaptive distribution chain. The distribution chain presented in this paper achieves all the three objectives of an adaptive chain: Firstly, to achieve ... -
Simulation of Mass Vaccination Programs: Centralized versus Mobile Vaccination
Guniem, Mohammed Zoher; Davidrajuh, Reggie (Peer reviewed; Journal article, 2022)Vaccines of different types and purposes are crucial for preventing the spread of deadly infectious diseases. However, deploying vaccines in highly populated areas proves to be a great challenge that must be evaluated and ... -
Single Controller-Based Colored Petri Nets for Deadlock Control in Automated Manufacturing Systems
Kaid, Husam; Li, Zhiwu; Davidrajuh, Reggie (Peer reviewed; Journal article, 2020-01)Deadlock control approaches based on Petri nets are usually implemented by adding control places and related arcs to the Petri net model of a system. The main disadvantage of the existing policies is that many control ... -
Strict Minimal Siphon-Based Colored Petri Net Supervisor Synthesis for Automated Manufacturing Systems With Unreliable Resources
Al-Ahmari, Abdulrahman; Kaid, Husam; Li, Zhiwu; Davidrajuh, Reggie (Peer reviewed; Journal article, 2020)Various deadlock control policies for automated manufacturing systems with reliable and shared resources have been developed, based on Petri nets. In practical applications, a resource may be unreliable. Thus, the deadlock ... -
Structures for stepwise development of adaptive supply chain
Davidrajuh, Reggie (Journal article; Peer reviewed, 2006-12)Falling margins, globalization, and accelerating innova-tion cycles are forcing businesses to switch from traditional (linear and sequential) supply chains to adaptive supply chains that possess the flexibility needed ... -
Towards Modeling Road Tunnels: A Petri Nets based Approach
Davidrajuh, Reggie; Joseph, Joel Fabiean (Peer reviewed; Journal article, 2022)This paper aims to develop a mathematical model using Petri nets to simulate the traffic flow inside the road tunnel. First, a new modular Petri net theory is used; the modeling approach shown in this paper for modeling a ... -
Towards modeling the economies of personal relationships in dyadic business exchanges
Davidrajuh, Reggie; Jensen, Øystein (Journal article; Peer reviewed, 2007)This paper proposes modeling the economies of personal relationship so that its impact on the collective economic outcome in dyadic business exchanges can be measured. Firstly, this paper introduces personal relationship ... -
Understanding the IKEA Warehouse Processes and Modeling using Modular Petri Nets
Behzad, Behfar; Farzad, Maryam; Davidrajuh, Reggie (Peer reviewed; Journal article, 2020)Nowadays, large warehouses handle a huge number of products. Handling the enormity and different types of (range) products also demand complex warehouse processes. In this paper, the IKEA warehouse in Stavanger, Norway, ... -
Understanding the Importance of Efficient Visitor Flow within Tokyo Skytree
Haraldsen, Eirik Solland; Østrådt, Karl Meisland; Davidrajuh, Reggie (Peer reviewed; Journal article, 2021)Tokyo Skytree is the tallest freestanding tower in the world. The tower is a popular tourist attraction with two observational decks at an altitude of 350 and 450 meters. This paper aims to understand the importance of the ...