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1.
Use of climate scenarios to aid in decision analysis for interannual water supply planning 总被引:1,自引:0,他引:1
This work addresses the issue of climate change in the context of water resource planning on the time scale of a few years.
Planning on this time scale generally ignores the role of climate change. However, where the climate of a region has already
shifted, the use of historical data for planning purposes may be misleading. In order to test this, a case study is conducted
for a region, the Australian Capital Territory, where long term drought is raising concerns of a possible climate shift. The
issue is cast in terms of a particular planning decision; the option to augment water supply in the next few years to hedge
against the drought persisting. A set of climate scenarios are constructed for the region corresponding to the historical
climate regime and to regimes where progressively greater levels of change are assumed to have already taken place (5%, 10%,
20% reductions in mean rainfall). Probabilities of the drought persisting are calculated for each of the scenarios. The results
show substantial increases in the probability of the drought persisting for even moderate reductions in mean rainfall. The
sensitivity of the decision to augment supply to the scenario results depends ultimately on the planners tolerable thresholds
for the probability of the drought persisting. The use of different scenarios enables planners to explore the sensitivity
of the decision in terms of their risk tolerance to ongoing drought and to their degree of belief in each of the scenarios
tested. 相似文献
2.
The Quranic Arabic Corpus (http://corpus.quran.com) is a collaboratively constructed linguistic resource initiated at the University of Leeds, with multiple layers of annotation including part-of-speech tagging, morphological segmentation (Dukes and Habash 2010) and syntactic analysis using dependency grammar (Dukes and Buckwalter 2010). The motivation behind this work is to produce a resource that enables further analysis of the Quran, the 1,400 year-old central religious text of Islam. This project contrasts with other Arabic treebanks by providing a deep linguistic model based on the historical traditional grammar known as i′rāb (?????). By adapting this well-known canon of Quranic grammar into a familiar tagset, it is possible to encourage online annotation by Arabic linguists and Quranic experts. This article presents a new approach to linguistic annotation of an Arabic corpus: online supervised collaboration using a multi-stage approach. The different stages include automatic rule-based tagging, initial manual verification, and online supervised collaborative proofreading. A popular website attracting thousands of visitors per day, the Quranic Arabic Corpus has approximately 100 unpaid volunteer annotators each suggesting corrections to existing linguistic tagging. To ensure a high-quality resource, a small number of expert annotators are promoted to a supervisory role, allowing them to review or veto suggestions made by other collaborators. The Quran also benefits from a large body of existing historical grammatical analysis, which may be leveraged during this review. In this paper we evaluate and report on the effectiveness of the chosen annotation methodology. We also discuss the unique challenges of annotating Quranic Arabic online and describe the custom linguistic software used to aid collaborative annotation. 相似文献
3.
This article proposes to solve the problem of minimizing the total completion time in a two-machine permutation flowshop environment in which time delays between the machines are considered. For this purpose, an enumeration algorithm based on the branch-and-bound framework is developed, which includes new lower and upper bounds as well as dominance rules. The computational study shows that problems with up to 40 jobs can be solved in a reasonable amount of time. 相似文献
4.
Kais KlaiAuthor Vitae Samir TataAuthor VitaeJörg DeselAuthor Vitae 《Data & Knowledge Engineering》2011,70(5):467-482
The design of complex inter-enterprise business processes (IEBP) is generally performed in a modular way. Each process is designed separately and then the whole IEBP is obtained by composition. Even if such a modular approach is intuitive and facilitates the design problem, it poses the problem that correct behavior of each business process of the IEBP taken alone does not guarantee a correct behavior of the composed IEBP (i.e. properties are not preserved by composition). Proving correctness of the (unknown) composed process is strongly related to the model checking problem of a system model. Among others, the symbolic observation graph based approach has proven to be very helpful for efficient model checking in general. Since it is heavily based on abstraction techniques and thus hides detailed information about system components that are not relevant for the correctness decision, it is promising to transfer this concept to the problem raised in this paper: How can the symbolic observation graph technique be adapted and employed for process composition? Answering this question is the aim of this paper. 相似文献
5.
6.
Decay Rates for a Beam with Pointwise Force and Moment Feedback 总被引:4,自引:0,他引:4
Kais Ammari Zhuangyi Liu Marius Tucsnak 《Mathematics of Control, Signals, and Systems (MCSS)》2002,15(3):229-255
We consider the Rayleigh beam equation and the Euler–Bernoulli beam equation with pointwise feedback shear force and bending
moment at the position ξ in a bounded domain (0,π) with certain boundary conditions. The energy decay rate in both cases is
investigated. In the case of the Rayleigh beam, we show that the decay rate is exponential if and only if ξ/π is a rational
number with coprime factorization ξ/π=p/q, where q is odd. Moreover, for any other location of the actuator we give explicit polynomial decay estimates valid for regular initial
data. In the case of the Euler–Bernoulli beam, even for a nonhomogeneous material, exponential decay of the energy is proved,
independently of the position of the actuator.
Date received: October 30, 2000. Date revised: December 20, 2001. 相似文献
7.
8.
Sofia Barluenga Dr. Jean‐Gonzague Fontaine Cuihua Wang Dr. Kais Aouadi Dr. Ruihong Chen Dr. Kristin Beebe Len Neckers Dr. Nicolas Winssinger Prof. Dr. 《Chembiochem : a European journal of chemical biology》2009,10(17):2753-2759
The pochoximes, based on the radicicol pharmacophore, are potent inhibitors of heat shock protein 90 (HSP90) that retain their activity in vivo. Herein we report an extended library that broadly explores the structure–activity relationship (SAR) of the pochoximes with four points of diversity. Several modifications were identified that afford improved cellular efficacy, new opportunities for conjugation, and further diversifications. Cocrystal structures of pochoximes A and B with HSP90 show that pochoximes bind to a different conformation of HSP90 than radicicol and provide a rationale for the enhanced affinity of the pochoximes relative to radicicol and the pochonins. 相似文献
9.
Syrine Neffati Khaoula Ben Abdellafou Ines Jaffel Okba Taouali Kais Bouzrara 《International journal of imaging systems and technology》2019,29(2):121-131
Alzheimer's disease (AD), a neurodegenerative disorder, is a very serious illness that cannot be cured, but the early diagnosis allows precautionary measures to be taken. The current used methods to detect Alzheimer's disease are based on tests of cognitive impairment, which does not provide an exact diagnosis before the patient passes a moderate stage of AD. In this article, a novel classifier of brain magnetic resonance images (MRI) based on the new downsized kernel principal component analysis (DKPCA) and multiclass support vector machine (SVM) is proposed. The suggested scheme classifies AD MRIs. First, a multiobjective optimization technique is used to determine the optimal parameter of the kernel function in order to ensure good classification results and to minimize the number of retained principle components simultaneously. The optimal parameter is used to build the optimized DKPCA model. Second, DKPCA is applied to normalized features. Downsized features are then fed to the classifier to output the prediction. To validate the effectiveness of the proposed method, DKPCA was tested using synthetic data to demonstrate its efficiency on dimensionality reduction, then the DKPCA based technique was tested on the OASIS MRI database and the results were satisfactory compared to conventional approaches. 相似文献
10.
Chidambaram Siva Ramachandran Krithikadevi Gaidi Mounir Daoudi Kais Natarajamoorthy Mathan 《Journal of Materials Science: Materials in Electronics》2022,33(12):9134-9143
Journal of Materials Science: Materials in Electronics - Iron tungstate (FeWO4) nanoparticles were prepared by simple solution combustion technique. The preparation method discloses the first... 相似文献