evaluating the performance of medical screening tests in the absence of a gold standard latent class models
Báo cáo khoa học: " Development and Use of a Gold-Standard DataSet for Subjectivity Classifications" pdf
Ngày tải lên :
23/03/2014, 19:20
... value of the latent variable The latent variable represents the true state of the object, and is the source of the correlations among the observed variables As applied here, the observed variables ... m a t e s of these parameters are obtained, each clause can be assigned the most probable latent category given the tags assigned by the judges The EM algorithm takes as input the number of latent ... fold A binary feature is included for each of the following: the presence in the sentence of a pronoun, an adjective, a cardinal number, a modal other than will, and an adverb other than not We also...
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Báo cáo lâm nghiệp: "Rationalization of the performance of a mobile off-road system working in the forest environment with respect to its emission load" doc
Ngày tải lên :
07/08/2014, 10:21
... rational performance The most important measures compensating the environment contamination by extraneous substances are preventive measures that can be applied on a larger part of the area of endangered ... for the employment of machines with the rational performance Possibilities to determine the rational performance of machines are further discussed in this paper The objective of this paper was ... proportional to an increase in the design performance; – The changed investment intensity of logging and transport systems is not proportional to the change in performance Such a situation arises...
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PERFORMANCE OF A COMBINED CONSTRUCTED WETLAND SYSTEM FOR TREATING VILLAGE SEWAGE IN LAKE DIANCHI VALLEY
Ngày tải lên :
05/09/2013, 08:40
... season, and the flux was big and the pollutants concentration was low in the rain season (from May to October) The data from the local weather station showed that the average annual rainfall and evaporation ... adopted to treat a typical village sewage There is the long rain season in local place always accompanied with strong storms at the beginning The stormwater runoff not only brings the large amounts ... wetland, in which the 20-30cm depth of free water was kept above the bottom and the Phragmites communis was dominant macrophyte The area was 300m2 and hydraulic loading rate was 30cm/d in the...
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Experimental study on the performance of a prism-shaped integrated collector-storage solar water heater
Ngày tải lên :
05/09/2013, 15:28
... water accumulates at the bottom while hot water ascends to the top of the tank It is originated from the fact that, after gaining heat from the solar radiation, the tank wall heats a thin vertical ... The time variation of solar radiation and average temperature of the present experimental study and the theoretical results of [1] in January Figure 12 The time variation of solar radiation and ... temperature, are the same in both studies Accordingly, a parameter equals to the ratio between the massweighted average temperature and the solar radiation may be used for the purpose of the comparison,...
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Optimization of design and operating parameters on the year round performance of a multi-stage evacuated solar desalination system using transient mathematical analysis
Ngày tải lên :
05/09/2013, 16:11
... M .A. , Al-Karaghouli A. A., Minasian A. N Photochemically assisted solar desalination of saline water Desalination 1992, 86(3), 317–324 [4] Mowla D, Karimi G Mathematical modeling of solar still in ... operating parameters on the performance and thermal characteristics of the system Description of the multi-stage evacuated solar desalination system The Multi-stage evacuated solar desalination ... for the maximum year round performance Each evaporator and condenser tray has an area of 1m2 inclined at an angle of 16o (a) (b) Figure Coupling of Multi-stage evacuated solar desalination system...
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Tài liệu The Design and Performance of a Real-time CORBA Event Service doc
Ngày tải lên :
19/02/2014, 18:20
... hardware, such as Forward Looking Infrared Radar, requires a new Sensor Proxy, I/O Facades must be altered to take advantage of the new technology ample has the following participants: Aircraft ... events In both tests, there was no other significant activity on the workstation during the benchmarking All tests were run in the Solaris real-time scheduling class so they had the highest software ... I/O Facade may depend on data from a subset of all Sensor Proxies Furthermore, it may use data from many Sensor Proxies in a single calculation of aircraft position Therefore, the I/O Facade can...
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Measuring and modelling the performance of a parallel ODMG compliant object database server potx
Ngày tải lên :
17/03/2014, 00:20
... Kumar KB, Muralikrishna M Gamma a high performance dataflow database machine Proceedings of the International Conference on Very Large Data Bases, Kyoto, Japan, August 1986 Morgan Kaufmann: San ... cost of inserting a single tuple The cost of inserting a tuple into one of the buckets of a hash table is the same as the cost of inserting a pointer to an element in memory into an array Hence ... on main-memory databases, relational query processing and alternative tree shapes rather than alternative join algorithms In [7], a parallel pointer-based join algorithm is analytically compared...
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Báo cáo hóa học: " Research Article Impact of LQI-Based Routing Metrics on the Performance of a One-to-One Routing Protocol for IEEE 802.15.4 Multihop Networks" docx
Ngày tải lên :
21/06/2014, 11:20
... scale, and then normalizing to the integer domain The path cost was calculated as the sum of the costs of the links that compose the path As adding link costs is equivalent to multiplying the ... overestimate the transmission performance by not including the LQI of lost packets [19] 6.2 Variability of the LQI of a Link Figure depicts the standard deviation of the LQI against the average values ... illustrates the average and standard deviation of path lifetime for each routing metric, measured as the total time between the instant in which a path delivers its first packet and the instant at...
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Báo cáo hóa học: "Research Article Spectrum Sharing in an ISM Band: Outage Performance of a Hybrid DS/FH Spread Spectrum System with Beamforming" docx
Ngày tải lên :
21/06/2014, 19:20
... characterize the mainlobe of a beam In [18], a beamforming model having a flat mainlobe and a flat sidelobe is developed The width of the mainlobe and the height of the sidelobe are calculated based ... to the increase of the processing gain of the DS/FH system The impact of spreading gain is shown in Figure 10 It is seen that increasing the spreading gain improves the outage performance at all ... gain in the direction of desired signal and decrease the gains in the directions of interferences When transmitting a signal, beamforming can increase the gain in the direction of the signal A...
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Improving the performance of a high power, lead–acid battery with paste additives docx
Ngày tải lên :
05/07/2014, 20:21
... remaining material becomes isolated and cannot react The amount of active material that can be discharged before the remaining material becomes isolated is termed the critical volume fraction Values ... that simulate the conductivity of the positive active material and the diffusion of sulfate ions Researchers w15,16x have found that after a certain amount of the active material has reacted the ... critical volume fraction is calculated as the ratio of discharged nodes to the initial number of available nodes The model can take into account any non-conductive additives by initially marking...
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Effect of heat transfer law on the finite time exergoeconomic performance of a generalized irreversible carnot heat engine
Ngày tải lên :
09/09/2015, 10:32
... heat transfer surface area of the two heat exchangers is taken as a constant , that is F1 + F2 = FT (12) And a ratio ( f ) of heat exchanger area is defined as f = F1 F2 (13) Assuming that the ... for all cases with heat leakage For the cases without heat leakage, the profit rate decreases when the irreversibility factor ϕ increases with the shape of the curve remaining parabolic For the ... case of n < , the optimal efficiency at the maximum profit rate increases with the increase of n as shown in Figure While, for the case of n > , the optimal efficiency at the maximum profit rate...
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Ecological performance of a generalized irreversible Carnot heat engine with complex heat transfer law
Ngày tải lên :
05/09/2013, 15:28
... in the heat transfer processes between the working fluid and the heat reservoirs of the heat engine And they further obtained the optimal ecological performance of an endoreversible heat engine ... hightemperature-side heat exchanger , β is the overall heat transfer coefficient and F2 is the heat-transfer surface area of the low-temperature-side heat exchanger Defining the heat transfer surface area ... engineering, and marine nuclear reactor engineering He is a Professor in the Department of Power Engineering, Naval University of Engineering, PR China He is the author or co-author of over 750...
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Experimental study of operation performance of a low power thermoelectric cooling dehumidifier
Ngày tải lên :
05/09/2013, 16:10
... to a weak heat and mass transfer between the fin surfaces and the ambient inside the cabinet As a result, the dehumidifying rate began to decrease, and this was the so-called first decelerating ... respectively A 2.4W axial fan for forced convection was amounted on the fin heat exchanger of the heat side of the TED In order to eliminate the effect of contact resistances as possible, a thin layer of ... reaching the maximum level, and finally drops quickly For instance, when the input power was 6.0 W, the COP began to accelerate at 80 min, which was the start of the second accelerating stage...
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Effect of injection timing on combustion and performance of a direct injection diesel engine running on Jatropha methyl ester
Ngày tải lên :
05/09/2013, 16:11
... outlet and load on the engine These signals are interfaced to computer through data acquisition system and the software displays the P-Ө and P-V diagrams The specifications of the engine and instrumentation ... all settings, the emission values were recorded thrice and a mean of these was taken for comparison The performance of the engine at different loads and settings was evaluated in terms of brake ... with exhaust gas opacity The software enables evaluation of performance from the acquired data using standard relationships The BTHE is evaluated using the expression BTHE = (brake power x 3600...
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Báo cáo hóa học: " Improvement on thermal performance of a diskshaped miniature heat pipe with nanofluid" docx
Ngày tải lên :
20/06/2014, 22:20
... Tokyo, Japan) micrograph of the gold nanoparticles with an average diameter of 17 nm; the volume fraction of the gold nanoparticles in the nanofluid was about 0.17% There are several types of carbon ... base fluid results in a greater viscosity of the nanofluid The measured values of the thermal conductivity of nanofluids and DI water are also listed in Table The thermal conductivity of nanofluid ... measured dynamic viscosities and thermal conductivities of nanofluids and DI water The viscosity of DI water is almost the same as that in the data in the Heat Transfer textbook [13] The data...
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Báo cáo hóa học: " Research Article Design, Analysis, and Performance of a Noise Modulated Covert Communications System" ppt
Ngày tải lên :
21/06/2014, 23:20
... received data frame is transformed back into the original sample values and the audio can be recovered At the receiver side, the received signals at the output of vertical polarization antenna and ... channel was done to validate the theoretical results in (25), and the results are shown in Figures and In the simulation, both the SNRV and the SNRH terms are equal, and the bandwidth of the antenna ... A Lyrtech field programmable gate array board samples the audio wave and translates it into binary bit stream This bit stream is interpreted as +/– voltage by the digital to analog converter and...
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Báo cáo hóa học: " Research Article Performance of a Two-Level Call Admission Control Scheme for DS-CDMA Wireless Networks" potx
Ngày tải lên :
22/06/2014, 19:20
... call blocking performance of class and class calls in Figures and shows that, for the 2-level CAC scheme and values of Wd /W in the range of [0.5, 0.85], the class call blocking is the same as ... For a given value of Λ, the average waiting time decreases very rapidly as the bandwidth reservation ratio is increased As an example, at an aggregate new call arrival rate of 0.35 calls/sec, the ... presents the average waiting time of class calls assuming the 2-level CAC scheme The results are plotted against reservation bandwidth ratio and parameterized by aggregate new call arrival rate,...
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Báo cáo y học: " Effect of 28 days of creatine ingestion on muscle metabolism and performance of a simulated cycling road race" docx
Ngày tải lên :
11/08/2014, 23:21
... sets of three 10second sprints Declaration of Competing interests The authors declare that they have no competing interests Abbreviations ANOVA: Analysis of variance; ANCOVA: Analysis of covariance; ... mmol/kg and for creatine phosphate and total creatine, respectively These data, in combination with our performance data demonstrating an increased performance that was not dependent upon the type of ... and the total time of the sprint The cyclists maintained the same dietary and training regimen for the three days prior to the second two-hour cycling bout, and consumed the same amount of water...
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Finite time exergoeconomic performance of a generalized irreversible carnot heat engine with complex heat transfer law
Ngày tải lên :
09/09/2015, 10:06
... heat exchangers are finite The total heat transfer surface area ( F ) of the two heat exchangers is assumed to be a constant: F = F1 + F2 (iii) There exists a constant rate of bypass heat leakage ... exergoeconomic performance bound decrease with the increase of the internal irreversibility The heat leakage changes the profit versus efficiency relation quantitatively and qualitatively The characteristic ... covers a diversity of topics in engineering thermodynamics, constructal theory, reliability engineering, and marine nuclear reactor engineering He is a Professor in the College of Power Engineering,...
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Báo cáo khoa học: "Creating a Gold Standard for Sentence Clustering in Multi-Document Summarization" potx
Ngày tải lên :
08/03/2014, 01:20
... classes, so that ci ∩ cm = ∅ |C| is the number of classes in C C is also called a gold standard of a clustering of data set D because this set contains the ”ideal” solution to a clustering task ... almost paraphrases For our task sentences that are not paraphrases can be in the same cluster (see rule 5, 8, 9) In general there are several constraints that pull against each other The judges have ... evaluation of S IM F INDER Hatzivassiloglou et al (2001) created a set of 10.535 manually marked pairs of paragraphs Two human annotator were asked to judge if the paragraphs contained ’common information’...
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