Search results for "Drawback"
showing 10 items of 20 documents
Safety studies of a hydrogen refuelling station: Determination of the occurrence frequency of the accidental scenarios
2009
At present, the hydrogen vehicles technology appears to have future Prospective for reduction in greenhouse gas emissions. Nevertheless, the development of such a technology requires appropriate infrastructures for production, Storage and refuelling stages in a refuelling station. This one presents safety challenges due to the hydrogen chemicophysical characteristics. So, to avoid hazards, it is necessary to implement safety practices that, if early adopted in the development of a fuelling station project, can allow very low impact, safety being incorporated in the project itself. However, a drawback is the not sufficient experience and the scarcity of the relevant data collection. To deepe…
Sustainability in Polish Road Transport Sector
2013
Abstract Today, road transport is the fastest-growing segment of the freight transport in Poland. Due to its dynamic development in the 90's and low barriers to entry of new transport companies the importance of this segment still growing. Low transport rates, the ability to reach every place, as well as high flexibility and reliability of supplies carried are the main advantages of this kind of transport. However, besides the advantages, road transport has disadvantages as well, and the biggest drawback of this type of transport is its negative impact on the environment through the emission of pollutants into the atmosphere. In addition, road transport is characterized by high land consump…
Solving dynamic memory allocation problems in embedded systems with parallel variable neighborhood search strategies
2015
International audience; Embedded systems have become an essential part of our lives, thanks to their evolution in the recent years, but the main drawback is their power consumption. This paper is focused on improving the memory allocation of embedded systems to reduce their power consumption. We propose a parallel variable neighborhood search algorithm for the dynamic memory allocation problem, and compare it with the state of the art. Computational results and statistical tests applied show that the proposed algorithm produces significantly better outcomes than the previous algorithm in shorter computing time.
An attribute based access control scheme for secure sharing of electronic health records
2016
Electronic health records (EHRs) play a vital role in modern health industry, allowing the possibility of flexible sharing of health information in the quest of provisioning advanced and efficient healthcare services for the users. Although sharing of EHRs has significant benefits, given that such records contain lot of sensitive information, secure sharing of EHRs is of paramount importance. Thus, there is a need for the realization of sophisticated access control mechanisms for secure sharing of EHRs, which has attracted significant interest from the research community. The most prominent access control schemes for sharing of EHRs found in literature are role based and such solutions have…
Optimal Hedging of Option Portfolios with Transaction Costs
2006
One of the most successful approaches to option hedging with transaction costs is the utility based approach pioneered by Hodges and Neuberger (1989). However, this approach has one major drawback that prevents the broad application of this approach in practice: the lack of a closed-form solution. The direct numerical computations of the utility based hedging strategy are cumbersome in a practical implementation. Despite some recent advances in finding an explicit description of the utility based hedging strategy by using either asymptotic, approximation, or other methods, so far they were concerned primarily with hedging a single plain-vanilla option. However, in practice one often faces t…
Efficient analytic approximation of the optimal hedging strategy for a European call option with transaction costs
2006
One of the most successful approaches to option hedging with transaction costs is the utility-based approach, pioneered by Hodges and Neuberger [Rev. Futures Markets, 1989, 8, 222–239]. Judging against the best possible trade-off between the risk and the costs of a hedging strategy, this approach seems to achieve excellent empirical performance. However, this approach has one major drawback that prevents the broad application of this approach in practice: the lack of a closed-form solution. We overcome this drawback by presenting a simple yet efficient analytic approximation of the solution. We provide an empirical testing of our approximation strategy against the asymptotic and some other …
Assessing the efficiency of Chilean water and sewerage companies accounting for uncertainty
2016
Abstract Efficiency assessment of water and sewerage companies (WaSCs) has attracted considerable attention both for water company managers and water regulators. Within the methodological approaches that can be applied to estimate efficiency scores, data envelopment analysis (DEA) is the most widely applied technique. In spite of the positive features of DEA, it presents a major drawback which is its deterministic nature. In other words, conventional DEA models do not account for uncertainty in the data. To overcome this limitation, we assess, for the first time, the efficiency of a sample of Chilean WaSCs by using a DEA model with statistical tolerance in the data. Hence, 81 efficiency sco…
Does communal context bring the worst in narcissists?
2014
The present experiment (N = 95) investigated the relations of narcissism with social value orientation under facade conditions of testing communal or agentic traits (or none – in a control condition). The results indicated that narcissism predicted less willingness to share resources with others and more competitive orientation in a facade communal condition compared to the remaining two conditions: control and agentic. The results confirm narcissistic disregard for communal domain and are consistent with the extended agency model of narcissism and the “success as a drawback” effect.
A two-step, user-centered approach to personalized tourist recommendations
2017
Geo-localized, mobile applications can simplify a tourist visit, making the relevant Point of Interests more easily and promptly discernible to users. At the same time, such solutions must avoid creating unfitting or rigid user profiles that impoverish the users' options instead of refining them. Currently, user profiles in recommender systems rely on dimensions whose relevance to the user is more often presumed than empirically defined. To avoid this drawback, we build our recommendation system in a two-step process, where profile parameters are evaluated preliminarily and separately from the recommendations themselves. We describe this two-step evaluation process including an initial surv…
Vārdu krājumu novērtējums ar dažādu testēšanu paņēmienu izmantošanu
2016
Darbā tika pētītas vārdu krājuma testēšanas paņēmienu priekšrocības un trūkumi un visefektīvākais un drošākais paņēmiens vārdu krājuma pārbaudei mācību apstākļos. Pētījuma rezultāti spēj veicināt izvēli par labu konkrētam testēšanas paņēmienam, saskaņā ar novērtēšanas veidu un mērķi, tēmu, mērķauditoriju un vidi. Darba teorētiskā daļa ir balstīta uz Arthur Hughes (2003), Scott Thornbury (2002), John Read (2000) un Penny Ur (1999) teorijas. Gadījuma metodes ietvaros tika vadīta mācību nodarbība, pēc kuras studentu zināšanas tika novērtētas ar autores izstrādāto testa palīdzību. Kvantitatīva analīze tika pielietota testa rezultātu noteikšanā un uzticamības mērīšanā, turklāt kvalitatīva analīz…