Time-Uncertainty Analysis by Using Simulation in Project Scheduling Networks

Risks are inherently present In all construction projects. Quite often, construction projects fail to achieve their time quality and budget goals. Risk management is a subject, which has grown in popularity during the last decade. It is a formal orderly process for systematically identifying, analysing and responding to risks associated with construction projects so as to reduce the effects of these risks to an acceptable level. Risk analysis is primarily concerned with evaluating uncertainties. The purpose of risk analysis is to enable a decision-maker to take an appropriate response in advance against a possible occurrence of a problem. In this study, Monte Carlo simulation as a tool of risk analysis was used. The merge event bias as one of the essential problems associated with PERT is discussed, along with models and approaches developed by other researchers, namely, Probabilistic Network Evaluation Technique (PNET algorithm), Modified PNET, Back-Forward Uncertainly Estimation procedure (BFUE) and concept based on the robust reliability idea. These developed approaches are more reliable in planning construction projects compared to PERT because they attempt to handle the merge event bias problem. In addition, this study demonstrates a number of benefits. the most significant among them being that: (1) Formal risk management tec1miques are rarely used in construction. Dealing with risk management in construction is now essential for minimizing losses and to enhance profitability. (2) It is very dangerous to rely only on PERT/CPM conventional techniques in scheduling projects. (3) To use floats, as stated by traditional resource allocation method, is not practicable. (4) For a project network, the likelihood completion date of a project is exactly equal to the product of the probabilities of each path, separately, with respect to a project completion date. Using simulation now validates this statement. (5) The\ud computation error of a project likelihood completion date is less than 10 percent if a path of a float greater than twice the larger standard deviation of this mentioned path and the critical path is dropped from the calculation, and (6) An effective risk response framework is introduced to help contractors systematically manage the risk in scheduling their projects

Spin-3/2 dark matter in a simple tt-channel model

We consider a spin-3/2 fermionic dark matter (DM) particle interacting with the Standard Model quarks through the exchange of a charged and coloured scalar or vector mediator in a simple $t$-channel model. It is found that for the vector mediator case, almost the entire parameter space allowed by the observed relic density is already ruled out by the direct detection LUX data. No such bounds exist on the interaction mediated by scalar particles. Monojet + missing energy searches at the Large Hadron Collider provide the most stringent bounds on the parameters of the model for this case. The collider bounds put a lower limit on the allowed DM masses.Comment: Published EPJC versio

Minimal Spin-3/2 Dark Matter in a simple ss-channel model

We consider a spin~-~3/2 fermionic dark matter candidate (DM) interacting with Standard Model fermions through a vector mediator in the $s$-channel. We find that for pure vector couplings almost the entire parameter space of the DM and mediator mass consistent with the observed relic density is ruled out by the direct detection observations through DM-nucleon elastic scattering cross-sections. In contrast, for pure axial-vector coupling, the most stringent constraints are obtained from mono-jet searches at the Large Hadron Collider.Comment: 8 pages, 5 figures, Version accepted for publication in EPJ

Unification of gauge and Yukawa couplings

The unification of gauge and top Yukawa couplings is an attractive feature of gauge-Higgs unification models in extra-dimensions. This feature is usually considered difficult to obtain based on simple group theory analyses. We reconsider a minimal toy model including the renormalisation group running at one loop. Our results show that the gauge couplings unify asymptotically at high energies, and that this may result from the presence of an UV fixed point. The Yukawa coupling in our toy model is enhanced at low energies, showing that a genuine unification of gauge and Yukawa couplings may be achieved.Comment: 5 pages, 2 figure; new results, extended discussion, conclusions unchange

Simulation Study on the Open-Circuit Voltage of Amorphous Silicon p-i-n Solar Cells Using AMPS-1D

AMPS-1D (Analysis of Microelectronic and Photonic Structure) simulation program was used to simulate Amorphous Silicon p-i-n Solar Cell. The simulated result of illuminated current density-voltage characteristics was in a good agreement with experimental values. The dependence of the open-circuit voltage on the characteristics of the a-Si:H intrinsic layer was investigated. The simulation result shows that the open-circuit voltage does not depend on the thickness of the intrinsic layer. The open-circuit voltage decreases when the front contact barrier height is small or the energy gap of the intrinsic layer is small. The open-circuit voltage increases when the distribution of the tail states is sharp or the capture cross sections of these states are small. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3432

Convergence of IFRS in global accounting system : where do SAARC countries stand for?

The International Financial Reporting Standards (IFRS) has become universal financial reporting language as it is currently used by 166 (85%) (out of 195) countries in the Africa, Americas, Europe, Middle East and Asia and Oceana. Similarly, all eight country members of the South Asian Association for Regional Cooperation (SAARC) include Afghanistan, Bangladesh, Bhutan, India, Maldives, Nepal, Pakistan and Sri Lanka have accepted IFRS for presentation of financial statements of their public companies. In the era of globalistaion and liberalistion, IFRS are performing mounting significant role in the global accounting system. Therefore, this paper was intended to portray the process of convergence of IFRS in global accounting system and to identify the status of SAARC countries in convergence of IFRS. For this reason, secondary sources and review of literature were taken into consideration. The study demonstrated that IFRS set by International Accounting Standards Board (IASB) adopted by all countries have been altered slightly before accepting. The SAARC countries have also made minor modifications in IFRS and accepted in phased manner. The study concluded that the SAARC countries are facing number of problems that should be resolved for better convergence of IFRS.peer-reviewe

Effects of service marketing mix on Umrah customer satisfaction: empirical study on Umrah traveling industry in Malaysia

The objective of this research was to The purpose of this research was to study the customer perception toward marketing mix (product, price, place, promotion, people, process, physical evidence, marketing communication and after sale service), and customer satisfaction of Umrah traveling industry in Malaysia”. “A quantitative study was adopted for collecting data. The customers who performed Umrah more than once were on the focus of this study. The necessary data were collected from 384 respondents through a structured questionnaire using a convenience sampling technique”. “Customer perception toward all dimensions service marketing mix have a positive impact on customer satisfaction. The present study enables the understanding of consumer behavioural features, especially in term of customer satisfaction in Umrah services, particularly in Malaysia and the overall Umrah industry”. “The service sector plays a pivotal role in a country’s economy specifically in Malaysia and part of this sector services is the Umrah services, becomes it is important for commercial activities and contributes to the quality of life. In short, it implies that the role of Umrah services is regarded as a basic need of life”. “Thus, it is imperative to fulfil the requirements and expectations of customers in multifarious backgrounds. This study is an initial effort in investigating the satisfaction of Umrah customers in Malaysia, including their contributing factor, name service marketing mix

Osmotic Drug Delivery System of Valsartan

The objective of this study is to design and evaluate a new EOP called swellable elementary osmotic pump (SEOP) of the freely water soluble drug, amitriptyline hydrochloride (1 g /mL) by adding water swellable polymers in the core. The hydrophilic polymers included in the core retard the highly water soluble drug by producing hydrogel within the core, which may restrict and delay the solvent contact with drug molecules and may increase the diffusional length of the solvent to achieve a constant release rate. Thus, this technology can be exploited to achieve constant drug release at predetermined rate especially for highly water soluble drugs