In this paper we discuss a GPU implementation of a hybrid deterministic/Monte Carlo method for the solution of the neutron transport equation. The key feature is using GPUs to perform a Monte Carlo transport sweep as ...
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In this paper we discuss a GPU implementation of a hybrid deterministic/Monte Carlo method for the solution of the neutron transport equation. The key feature is using GPUs to perform a Monte Carlo transport sweep as part of the evaluation of the nonlinear residual and Jacobianvector product. We describe the algorithm and present some preliminary numerical results which illustrate the effectiveness of the GPU Monte Carlo sweeps.
Replica is better than erasure coding when managing the redundancy of a storage system under high churn. It needs extra network communication to keep the target redundancy. By classifying the hosts into different cate...
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Replica is better than erasure coding when managing the redundancy of a storage system under high churn. It needs extra network communication to keep the target redundancy. By classifying the hosts into different categories of availability and placing the data replicas carefully may reduce the maintenance overhead. Considering a globe scale P2P system, the time-zoned multilayer Chord divides the hosts into 24 categories according to the time zone where they located. All the hosts are belongs to a Main Chord which consisted of all the hosts and one Local Chord which consisted of the hosts located in the same time zone. Because of the daily behavior of the people in same time zone are nearly similar, which means their computers are more likely to be available in the daytime and less likely to be available in the nighttime. So, for a certain time, there is nearly half of the hosts get higher availability than the other hosts. As the hosts in the same time zone are considered, their availability evaluated by the system is shifting periodically in a 24 hours cycle. By give a carefully placement of the data replicas on this two layered Chord, the less communication is needed to maintain the same target availability. The experiments show that dividing hosts by location of time zone might reduce the overhead of redundancy management.
The cache partition mechanism is introduced to solve the problem of contention and pollution of caches in Chip Multiprocessor. One of the key questions is to analyze online the utility characteristics and efficiency o...
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The cache partition mechanism is introduced to solve the problem of contention and pollution of caches in Chip Multiprocessor. One of the key questions is to analyze online the utility characteristics and efficiency of cache requests originating from different sources. Cache request is differentiated by hardware thread context id. Based on the working set model, within a certain sampling time frame, a number of specific cache lines are preserved by modifying the cache address mapping mechanism and its number is the same as that of the hardware threads of the processor, performing statistics on the frequency of Stack Distance under LRU respectively. Based on the characteristic of the frequency distribution of Stack Distance, We propose a metric, L*D, to measure online the recognition of the cache utility efficiency of the working set and providing information for the decisionmaking of cache allocation and management. Experiments performed in multiple Benchmarks in Spec Cpu2000 show that the online monitoring mechanism and quantitative metric discussed in this article have achieved fine-grained online monitoring of the efficiency of cache utility based on the working set. Not only do they allow the online recognition of cache space utility characteristic, but they do also enable the identification of any changes in the efficiency of cache utility, achieving an accuracy of over 75%.
作者：
Junqing ZhangRuchuan WangYisheng QianQianyi WangCollege of Computer
Nanjing University of Posts and Telecommunications Nanjing Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education
The main study of traditional probability coverage problem in wireless sensor networks(WSNs) is aiming at twodimensional space, however, most practical applications of wireless sensor network is placed in a three-dime...
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The main study of traditional probability coverage problem in wireless sensor networks(WSNs) is aiming at twodimensional space, however, most practical applications of wireless sensor network is placed in a three-dimensional sensor networks. Therefore, probability model is introduced for three-dimensional WSNs. This paper presents a method that using Voronoi divide to control the Scheduling of the probability model nodes in the target area. Also, a coverage control algorithm based on probability model(PMCCA) is proposed. We verify the effectiveness and the practice of PMCCA algorithm by comparing PMCCA algorithm to another algorithm in simulation experiment.
As an important section in the chain of semiconductor products manufacturing,dispensing techniques and relevant dispensers drawn increasing attentions of the researchers and engineers in recent *** some applications,t...
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ISBN:
(纸本)9781509035946
As an important section in the chain of semiconductor products manufacturing,dispensing techniques and relevant dispensers drawn increasing attentions of the researchers and engineers in recent *** some applications,the dispenser cycles are required to be completed within 2 8)and the corresponding dot diameters are usually in micrometer scale,and sometimes even in nanometer scale when extremely high precision is *** factors that affect dispensing precision vary with different application cases and *** designers of dispensing mechanism usually find themselves facing the difficulties to balance among these factors with the risk of losing satisfying dispensing *** by such increasing demand of high precision and high efficiency dispensing in the electronic packaging industry,this paper presents an alternative approach for the parameter design of a dispensing valve based on the dynamic fluid simulation and multi-objective *** regard to current dispensing techniques,geometric model standing for the end of nozzle and the section where air and fluid substance interact is set *** fluid simulation is taken to observe the forming of *** material properties and dynamic parameters are used to set up governing *** motion of fluid substance is modeled with Volume of Fluid model and formation and separation of droplets are *** the aid of multi-objective optimization tools,the optimized solution are offered based on simulation results,which allow the designer make a reasonable tradeoff without losing the dispensing precision.
The identification of Arabic dialects is considered to be the first pre-processing component by any NLP *** identification is useful for automatic translation,information retrieval,opinion mining and sentiment *** of ...
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ISBN:
(纸本)9781509035946
The identification of Arabic dialects is considered to be the first pre-processing component by any NLP *** identification is useful for automatic translation,information retrieval,opinion mining and sentiment *** of the work on the identification treat this issue like any classification *** work are based on supervised *** majority of them are based on the EGYPTIAN(EGY),the TUNISIAN(TUN),the IRAQI(IRAQI) dialect,etc.,by omitting the Algerian *** purpose of this paper is to identify the Arabic dialects within social media in an unsupervised *** order to do so,we use an Algerian dialect lexicon and based on Algeriers *** also propose an approach based on an algorithm that perform three kinds of identification: 1) total(when the term is totally identify),2) partial(when the term is identified only partially with prefix and suffix) and by using the improved Levenshtein distance(based on classical Levenshtein distance) and with considering the number of character of the words compared).We applied our algorithm on a corpus of 100 messages that were collected using the Facebook API,we obtain a rate exceeding 60%.
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