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11.
One of the most important issues in any database design is the optimization of its performance. The external database parameters play one of the main roles in a network database performance considerations. The analytic and the simulative approaches to establish these parameters are discussed. An heuristic approach using system simulation method to find the optimal database external parameters is developed and compared with the analytic one. The software system to implement the simulation methodology is presented. This system has been successfully implemented with the VAX-11 DBMS. 相似文献
12.
Optimization of the two-step reaction for preparation of polygly-cerol esters of fatty acids from the industrial point of view has been studied. Parameters such as nature of the alkaline catalyst, tempera-ture and time of the reaction have been examined. It was found that the polymerization process needs 260–280 C in the presence of inert gas and 2.5 mol % of NaOH as catalyst. The esterification can be accomplished in the absence of additional catalyst and temperatures as low as 230 C. A simulation model of a chemical plant has been used for evaluation of cost of the production of such emulsifiers. 相似文献
13.
Efrat?JaegerEmail author Nissim?Francez Shuly?Wintner 《Journal of Logic, Language and Information》2005,14(2):199-234
Unification grammars are known to be Turing-equivalent; given a grammar G and a word w, it is undecidable whether w L(G). In order to ensure decidability, several constraints on grammars, commonly known as off-line parsability (OLP), were suggested, such that the recognition problem is decidable for grammars which satisfy OLP. An open question is whether it is decidable if a given grammar satisfies OLP. In this paper we investigate various definitions of OLP and discuss their interrelations, proving that some of the OLP variants are indeed undecidable. We then present a novel, decidable OLP constraint which is more liberal than the existing decidable ones. 相似文献
14.
We describe the first shared task for figurative language resolution, which was organised within SemEval-2007 and focused
on metonymy. The paper motivates the linguistic principles of data sampling and annotation and shows the task’s feasibility
via human agreement. The five participating systems mainly used supervised approaches exploiting a variety of features, of
which grammatical relations proved to be the most useful. We compare the systems’ performance to automatic baselines as well
as to a manually simulated approach based on selectional restriction violations, showing some limitations of this more traditional
approach to metonymy recognition. The main problem supervised systems encountered is data sparseness, since metonymies in
general tend to occur more rarely than literal uses. Also, within metonymies, the reading distribution is skewed towards a
few frequent metonymy types. Future task developments should focus on addressing this issue.
相似文献
Malvina NissimEmail: |
15.
Martin Zarbov David Brandon Nissim Cohen Liat Shemesh 《Journal of Materials Science》2006,41(24):8115-8122
Providing the particle size, shape and size distribution are suitable, appropriate dispersion media and surface-active additives can usually be found for the electrophoretic deposition (EPD) of powder with any chemical composition. The design of the EPD cell is largely dictated by the geometry of the final product and the required dimensional tolerances. The integrity of the microstructure and freedom of the product from process defects commonly depend on the deposition parameters and the dispersion chemistry.Demonstrations of laboratory feasibility for EPD products may prove straightforward, but developing an EPD process technology that is suitable for mass production can be far more challenging. This contribution reports four examples:
In each case, the process parameters have been selected to satisfy the engineering requirements while minimizing the formation of process defects. Observed defects include variations in the particle packing density; loss of adhesion to the substrate, cracking of the deposit and surface roughness or thickness variations. 相似文献
1. The deposition of silver thermal sinks in low-temperature, co-fired ceramic (LTCC) tape vias. | |
2. The formation and printing of silver-base alloy lines for conducting interconnects. | |
3. The embedding of passive ceramic components in punched ceramic tape. | |
4. The production of porous conducting anodes for solid electrolyte capacitors. |
16.
Nissim Francez 《Journal of Computer and System Sciences》2012,78(3):960-969
The paper considers the issue of different type-logical semantic definitions (of some natural language fragment) being “essentially” the same, though expressed using different type-systems. A definition of the equivalence is suggested, and is applied to four definitions of a very simple extensional fragment of English. 相似文献
17.
Nissim N Eliezer S Bakshi L Perelmutter L Pasternak MP 《The Review of scientific instruments》2011,82(3):033905
High pressure ellipsometry (HPE) method was developed for determining the index of refraction of opaque materials in a diamond anvil cell (DAC). A main difficulty in DAC-based HPE, namely, the pressure-induced birefringence developed in the diamond, was overcome enabling the extraction of the ellipsometric parameters of the sample. The method used was based on the fact that an unpolarized light is unaffected by a retarding optical element and thus reduces the number of unknown parameters in the problem. Because of technical difficulties in using unpolarized light, a linear combination of orthogonal polarizations was applied. In the experimental procedure, multiangle measurements of the ellipsometric parameter ψ are collected at each pressure and the data is fitted together with a measurement of the near normal reflectivity, in order to extract the complex index of refraction. As a test case, this procedure was used to measure the high pressure index of refraction of iron up to 30 GPa for light with wavelengths of 532 and 633 nm. From the index of refraction as a function of pressure the diamond-iron interface emissivity for different pressures was derived and from which the phase transition α → ε could be identified and characterized. The emissivity increases with pressure both at the α (0-9 GPa) and the ε phase (21-30 GPa) however decreases at the mixed α - ε (9-21 GPa) range. From the imaginary part of the index of refraction the pressure dependence of the energy skin depth of iron was extracted. It was found that the energy skin depth increases by an order of magnitude at 30 GPa relative to ambient conditions. 相似文献
18.
We revisit the problem of constructing efficient secure two-party protocols for the problems of set intersection and set union,
focusing on the model of malicious parties. Our main results are constant-round protocols that exhibit linear communication
and a (practically) linear number of exponentiations with simulation-based security. At the heart of these constructions is
a technique based on a combination of a perfectly hiding commitment and an oblivious pseudorandom function evaluation protocol.
Our protocols readily transform into protocols that are UC secure, and we discuss how to perform these transformations. 相似文献
19.
The specific heats of tristearin in the presence of some food emulsifiers were determined by differential scanning calorimetry.
Solid emulsifiers show Cp curves different from those of pure tristearin, indicating that a new mixed crystal has been obtained
through the incorporation of the surfactant within the fat. 相似文献
20.