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For a project to be delivered on-time and to an agreed cost in accordance with the specification, it is important to have an appropriate purchasing strategy. A project succeeds due to many factors, one of which is cost alongside timely delivery and quality. Formal purchasing strategies for different purchasing categories are common in the manufacturing industry, but less so in a project-based indu
This paper presents tractable two parameter stochastic processes of the drift-diffusion class in order to model economic processes with a focus on income. Starting from the resulting closed-form, cross-sectional distributions, easy-to-interpret expressions for mobility and inequality (including the popular Gini-coefficient) are derived. The general processes are applied to discuss income mobility
Pseudo-random functions are a fundamental building block in many cryptographic applications. In certain scenarios, a weaker notion (where security is restricted to uniformly random input), but more computationally efficient, called weak pseudo-random functions, is sufficient. In this work, we present new differential attacks on the main binary weak pseudo-random function constructions, namely the
By using bootstrap technique we investigate the properties of the Breusch [Breusch, T.S., 1978. Testing for autocorrelation in dynamic linear models. Australian Economic Papers 17, 334-355]-Godfrey [Godfrey, L.G., 1978. Testing for higher order serial correlation in regression equations when the regressors include lagged dependent variables. Econometrica 46, 1303-1310] autocorrelation tests in dyn
Abstract in UndeterminedIn this paper, a number of channel estimation algorithms for iterative receivers are compared for the case of an up-link orthogonal frequency division multiplexing interleave division multiple access (OFDM-IDMA) system. Both pilot based algorithms, used to obtain an initial estimate, as well as semi-blind decision-directed algorithms working as a component of the iterative
This paper presents RF as well as low-frequency capacitance–voltage (C–V) characterization of vertical wrap-gated InAs/high-κ nanowire MOS capacitors. A full equivalent circuit model for traps is used to fit the low-frequency C–V characteristics, from which the interface trap density (Dit) and border trap density (Nbt) are evaluated separately. The results show comparable Nbt but far lower Dit (<1
Enterprise resource planning (ERP) use and ERP value are of high interest among both academia's as well as practitioners. Despite different views of gained value from implemented ERP, there are some studies focusing in larger companies, however, few studies report on challenges experienced by Small and Medium sized Enterprises (SMEs). Based on diffusion of innovation (DOI) literature and resource-
In his original contribution, Exner's principal concern was a comparison between the properties of different aftereffects, and particularly to determine whether aftereffects of motion were similar to those of color and whether they could be encompassed within a unified physiological framework. Despite the fact that he was unable to answer his main question, there are some excellent-so far unknown-
The valorization of lignin offers sustainable and renewable products and materials. For that reason lignin needs to be further analyzed although the various challenges this process implicates. The major obstacles in this field are lignin’s chemical heterogeneity, all the modifications in lignin’s chemical structure owing to its extraction method and purification process and the lack of appropriate
In 2007, Mexico City legalized abortion in the first 12 weeks of pregnancy. By doing so, it became the first and only state in Mexico where abortion on demand is legal. In this paper, I use this natural experiment to estimate the effects of abortion legalization on child and maternal health. I perform Difference-In-Differences estimates using information from all births and deaths occurred between
Under de senaste decennierna har rörelsefriheten för barn minskat. Föräldrar är mer oroliga för deras barns säkerhet idag än tidigare och antalet föräldrar som kör sina barn till skolan har ökat. Barns rörelsefrihet är viktig för deras utveckling både fysiskt och psykiskt. Barn har speciella behov avseende trafikmiljön om de ska kunna använda det självständigt. De kan inte hantera trafiksituationeThere has been a decline in the independent mobility of children over the last decades. Parents are more worried about the safety and security of their children and the number of parents driving their children to school has increased. The independent mobility of children is important for their development both physically and mentally. Children has special needs concerning the traffic environment i
Demographic transitions are something that every country goes through, however do countries do it at different times. The Western world and Japan are today facing aging populations, developing countries of Africa are still facing high mortality, high fertility rates and booming populations while countries of South Asia and South America are somewhere in between. The demographic diffusion sets up a
In the paper we consider a commonly known network design problem with demand restoration assuming stub release. No compact linear programming (LP) formulation for the problem is known, and all known non-compact LP formulations of the problem require NP-hard path generation (pricing). Therefore, the problem itself is suspected to be NP-hard - this, however, is not actually known. The main result of
The Natural gas Combined Cycle (NGCC) with post combustion capture using liquid solvents may in some cases be of interest to design with a flexible steam bottoming cycle, so that it can operate both with and without CO2 capture. It is then important that the choice of the low pressure (LP) steam turbine exhaust size is made accordingly. The paper describes why a flexible NGCC requires a LP steam t
Silica-filled poly(1-trimethylsilyl-1-propyne) (PTMSP) layers were successfully applied for the first time on top of ultrafiltration support membranes and applied in the pervaporative separation of ethanol/water mixtures. Reduction of the thickness of the separating PTMSP top layer and addition of hydrophobic silica particles resulted in a clear flux increase as compared to dense PTMSP membranes.
