Mining Event Logs to Support Workflow Resource Allocation

Workflow technology is widely used to facilitate the business process in enterprise information systems (EIS), and it has the potential to reduce design time, enhance product quality and decrease product cost. However, significant limitations still exist: as an important task in the context of workflow, many present resource allocation operations are still performed manually, which are time-consuming. This paper presents a data mining approach to address the resource allocation problem (RAP) and improve the productivity of workflow resource management. Specifically, an Apriori-like algorithm is used to find the frequent patterns from the event log, and association rules are generated according to predefined resource allocation constraints. Subsequently, a correlation measure named lift is utilized to annotate the negatively correlated resource allocation rules for resource reservation. Finally, the rules are ranked using the confidence measures as resource allocation rules. Comparative experiments are performed using C4.5, SVM, ID3, Na\"ive Bayes and the presented approach, and the results show that the presented approach is effective in both accuracy and candidate resource recommendations.Comment: T. Liu et al., Mining event logs to support workflow resource allocation, Knowl. Based Syst. (2012), http://dx.doi.org/ 10.1016/j.knosys.2012.05.01

Completeness testing of sequential dimensions in 3D models based on locus intersection

International audienceComplete 3D dimensioning plays an important role in production, assembly and quality measurement. At first, the completeness testing of sequential dimensioning is transformed into the determination of the constrained states of geometric primitives (GP) according to the theory of geometric constraint (GC) solving and dependency analysis. Then the relationships between the completeness states of dimensions and the constrained state of GPs, the using state of dimensions are established. Secondly, the generation rules of locus are proposed based on the concept of locus, which is introduced to reflect the impact produced from GCs for GPs, and the principles of locus intersection are analyzed. Thirdly, the constrained state of each GP can be determined on the basis of references, and then the completeness states of dimensions can be confirmed. Finally, a 3D model with dimensions is taken as an example to demonstrate the process of completeness testing, and the results verify the effectiveness of the algorithm

Do passengers feel convenient when they transfer at the transportation hub?

Passengers' perceptions play an important role in the evaluation of transfer efficiency for a transportation hub. However, there are many ways to transfer between hubs and urban traffic, and passengers who use different transfer modes may have different perceptions of the same hub. This paper adopts a case study of the Nanjing South Comprehensive Transport Hub in China to identify the main barriers to intermodal integration from a people-centered perspective. A total of 833 questionnaires were collected to reflect passengers' perceptions of interchange services. Combined with observational investigations, we mainly consider factors such as the comfort of the transfer process, the frequency of departures, the route to the ticket office, and the location of the entrances to different urban transportation modes. A Rasch model is established based on the perceptions of inconvenience in passenger transfers. The model comprehensively evaluates intermodal transport services between the hub and urban traffic from the perspective of passengers. According to the results, there are significant differences for different interchange modes, and the factors that cause these differences are heterogenous. In addition, the results show that transfer facilities for metro and cars urgently need improvement due to their greater ridership. Finally, recommendations are given to planners and policy makers by considering the transfer demands of different passenger groups

Soil microbial biomass, basal respiration and enzyme activity of main forest types in the Qinling Mountains.

Different forest types exert essential impacts on soil physical-chemical characteristics by dominant tree species producing diverse litters and root exudates, thereby further regulating size and activity of soil microbial communities. However, the study accuracy is usually restricted by differences in climate, soil type and forest age. Our objective is to precisely quantify soil microbial biomass, basal respiration and enzyme activity of five natural secondary forest (NSF) types with the same stand age and soil type in a small climate region and to evaluate relationship between soil microbial and physical-chemical characters. We determined soil physical-chemical indices and used the chloroform fumigation-extraction method, alkali absorption method and titration or colorimetry to obtain the microbial data. Our results showed that soil physical-chemical characters remarkably differed among the NSFs. Microbial biomass carbon (Cmic) was the highest in wilson spruce soils, while microbial biomass nitrogen (Nmic) was the highest in sharptooth oak soils. Moreover, the highest basal respiration was found in the spruce soils, but mixed, Chinese pine and spruce stands exhibited a higher soil qCO2. The spruce soils had the highest Cmic/Nmic ratio, the greatest Nmic/TN and Cmic/Corg ratios were found in the oak soils. Additionally, the spruce soils had the maximum invertase activity and the minimum urease and catalase activities, but the maximum urease and catalase activities were found in the mixed stand. The Pearson correlation and principle component analyses revealed that the soils of spruce and oak stands obviously discriminated from other NSFs, whereas the others were similar. This suggested that the forest types affected soil microbial properties significantly due to differences in soil physical-chemical features

First-principles prediction of polar half-metallicity and out-of-plane piezoelectricity in two-dimensional quintuple layered cobalt selenide

Polar half-metals, possessing both polarity and half-metallicity, may have potential as media in novel spintronic quantum devices, but they have never been reported in the two-dimensional (2D) form. By combining the particle swarm optimization with first-principles calculations, we predict a stable 2D polar half-metal, quintuple layered Co2Se3monolayer. This is an XY magnet where its magnetism is governed by the interplay between super and double exchange along the Co-Se-Co motifs. Notably, 2D Co2Se3also exhibits out-of-plane piezoelectricity. We have, thus, discovered a multiferroic 2D compound with robust half-metallicity, rendering it great potential in advanced multiferroic applications.</p

2D boron dichalcogenides from the substitution of Mo with ionic B2 pair in MoX2 (X = S, Se and Te): high stability, large excitonic effect and high charge carrier mobility

Two-dimensional (2D) transition metal dichalcogenides are regarded as promising candidates for nanoelectronic devices, due to their novel electronic properties. Motivated by the similarity of valence electrons between Mo and B2 pairs, we design a new type of 2D MoS2-like material, i.e. boron dichalcogenides, through the global minimization search and density functional theory methods. Free standing trigonal and hexagonal phase boron dichalcogenide (B2X2, X = S, Se and Te) monolayers are predicted to be highly stable. The T-B2X2 and H-B2X2 monolayers are all semiconducting with indirect bandgaps ranging from 2.14 eV to 4.01 eV and large excitonic effects. Particularly, H-B2X2 exhibits high carrier mobility of up to 6.23 × 105 cm2 (V−1 s−1), which can be comparable to that of graphene. Therefore, 2D boron dichalcogenides have great potential for applications in high-performance flexible field-effect transistors and light emitters. Furthermore, the optical spectrum of these monolayers reveals that the absorption is in the ultraviolet region, suggesting future applications in ultraviolet optoelectronic devices

Predicting new two-dimensional Pd3(PS4)2 as an efficient photocatalyst for water splitting

Photocatalytic water splitting is a potential solution for energy and environmental problems. By using density functional theory method, here, we present an experimentally unexplored two-dimensional (2D) material, palladium thiophosphate (Pd3(PS4)2), as a promising photocatalyst for water splitting. 2D Pd3(PS4)2 is predicted to be exfoliated mechanically from the bulk phase and is dynamically stable. The calculated band gaps for mono-, bi-, and trilayered Pd3(PS4)2 are 2.81 eV (direct), 2.79 eV (indirect), and 2.70 eV (indirect), respectively. Moreover, their band edges straddle between the redox potentials of water. Thus, 2D Pd3(PS4)2 would be a promising photocatalyst for water splitting. Additionally, the strain has significant impact on light absorption and can further improve the photocatalytic capability. Our work expands the family of 2D materials and highlights a new interesting material for solar hydrogen production

SHRIMP zircon U-Pb ages and Hf isotopic compositions of Zhangshiying intrusive complex in the southern margin of the North China Craton and their geological implications

Zhangshiying intrusive complex (ZIC), consisting of K-feldspar granite, granite porphyry and quartz porphyry, is located in the southern margin of the North China Craton. The mafic enclaves are merely in K-feldspar granite and have textures indicating magma mixing. We obtained their SHRIMP zircon U-Pb ages of 107. 3 ± 2.4Ma, 106. 7 ± 2. 5Ma and 101 ± 3Ma for K-feldspar granite, granite porphyry and quartz porphyry, respectively. According to zircon Hf isotope analyses, their εHf(t) values are -15.96 - -20.80, - 18.97 - -22. 18 and -23. 41 - -27.95 and their corresponding Hf two-stage model ages (tDM2) are 1880-2018 Ma, 1925-2080Ma and 2144 - 2330 Ma One exception is the zircon inherited Archean information with 207Pb/206Pb age of 2.6 Ga, -0. 71 of εHf(t) and 3.0 Ga of tDM2. These data suggest that the source of ZIC is mainly either juvenile crust formed at 1.9 - 2.3Ga or an enriched mantle source with the contribution of Archean continental crust. On integration of regional research results, we suggest that ZIC could form at a regional lithospheric extensional setting which is confined to the existing NE-SW or NW-SE fault zones and is triggered by the drifting direction of the Pacific plate changing to southwest ward

Locking plate for treating traumatic sternoclavicular joint dislocation: a case series

Abstract Background Traumatic sternoclavicular joint dislocations are rare; closed reduction is the primary treatment. The failure of closed reduction or a prominent insult to the skin may require surgery to ensure the best possible outcome. Methods The records of 5 patients operated at our institution for sternoclavicular joint dislocation were reviewed. All patients were treated with open reduction and single 3.5-mm locking plate was used for fixation. Outcomes were evaluated with the Constant Shoulder Score (CSS) and Disability of the Arm, Shoulder, and Hand (DASH) questionnaire. Intraoperative and postoperative complications were recorded. Results All the patients had an average follow-up of 14 months (range, 11–16 months). At the final follow-up, the mean CSS score was 89.5 (range, 78–98) and the mean DASH score was 9.0 (range, 4–16). There were no early complications, including wound infection or neurologic or vascular deficits; there were also no broken or loosened screws or plates. No case of redislocation or arthrosis was observed. Conclusion Our study indicates that open reduction and fixation with a single locking plate for the treatment of traumatic sternoclavicular joint dislocation is a safe, relatively simple surgical procedure that can lead to satisfactory outcomes

Effect of W Addition on Fe-P-C-B Soft-Magnetic Amorphous Alloy

In this work, the thermal behavior, soft magnetic properties, and structure of Fe86−xP11C2B1Wx (x = 0, 0.1, 0.2, 0.4, 0.6, 0.8, 1, 2, and 4) amorphous alloys were researched by several experimental methods and ab initio molecular dynamics. The addition of W improved the thermal stability of the alloy system when the first onset crystallization temperature (Tx1) increased from 655 K to 711 K, significantly reduced the coercivity Hc, and decreased the saturation magnetization Bs. The Fe85.6P11C2B1W0.4 alloy showed optimal soft magnetic performance, with low Hc of 1.4 A/m and relatively good Bs of 1.52 T. The simulation results suggested that W atoms increased the distance of the neighboring Fe-Fe pair, reduced the coordination number, narrowed the gap between the spin-up and spin-down electrons of each atom, and decreased the average magnetic moment of the Fe atoms. This work demonstrates a micro-alloying strategy to greatly reduce Hc while maintaining high Bs