Heuristic Grid Resource Scheduling Algorithm based on Group of Task and Secondary Distribution

Zhongping Zhang,Yupeng Feng,Shan Zhang,Ying Sun 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.8

Grid resource scheduling policies directly affect the performance of the grid, so the grid resource scheduling algorithm for grid research has become a hot spot. In this paper, based on grid heterogeneity to resource scheduling of load balancing, effective resource utilization and minimize task sets the span of time (Makespan) as the goal, propose a heuristic grid resource scheduling algorithm based on Group of Task and Secondary Distribution, the basic idea is dividing the set of tasks into two groups by using the standard deviation, the one is long tasks group, another is short tasks group .The longest task in long tasks group will be allocated to the worst performance to execute, the rest can be done in the same manner. Tasks in short tasks group will be executed by the Min-Min algorithm , and then through secondary dispatch ideas to make the grid system to quickly reach each resource load balancing , improving resource utilization efficiency and minimizing the task set time span. Finally, the simulation model benchmark Braun et al. demonstrates the effectiveness of the algorithm.

Preparation of NiO and CoO nanoparticles using M2+-oleate (M = NiCo) as precursor

Zhongping Chen,Aiqun Xu,Yu Zhang,Ning Gu 한국물리학회 2010 Current Applied Physics Vol.10 No.3

The preparation of NiO and CoO nanoparticles was reported. The dot-like NiO and flower-like CoO nanoparticles were obtained using M2+-oleate (M = Ni, Co) as precursor via thermal decomposition method. Transmission electron microscopic (TEM) images monitored the growth of NiO and CoO nanoparticles. When the reaction complex including M2+-oleate (M = Ni, Co) precursor, oleic acid and 1-octadecene was heated to the refluxing temperature (320 ℃), the formed NiO and CoO nanoparticles were needlelike and very small, indicating low growth speed. However, when the reaction complex was kept refluxing for 30 min, dot-like NiO and flower-like CoO nanoparticles were observed, suggesting the accelerated growth at this refluxing stage. The difference of the morphology of the resultant NiO and CoO nanoparticles resulted from the difference of their growth mode. Selected-area electron diffraction (SAED) patterns showed the face-centered cubic structures of NiO and CoO nanoparticles. The magnetic property of the nanoparticles was studied using vibrating sample magnetometer (VSM).

Numerical simulation and parameter study of ejector in casing gas recovery system

Yaning Zhang,Junyou Zhao,Zhongping Liu,Peng Zuo,Afimbo Reuben Kwabena 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.6

In order to recover casing gas efficiently and safely, a new scheme is proposed to recover casing gas by using an ejector. The influence of the nozzle diameter and the distance from nozzle to throat on the performance of the ejector under different working conditions is studied. The results show that when the nozzle diameter is constant, the inspiratory capacity increases with the increase of water pressure. Compared three nozzles with different diameters, the inspiratory capacity and water flow were approximately linear. Under different working fluid pressures, as the distance from nozzle to throat increases, the ejection ratio of the ejector first increases and then decreases, and there is an optimal distance. In the field test, the gas flow rate of the recovered casing is about 35.27 m 3 /h.

Enhancement of α-ketoglutarate Production in Torulopsis glabrata: Redistribution of Carbon Flux from Pyruvate to α-ketoglutarate

Dandan Zhang,Nan Liang,Zhongping Shi,Liming Liu,Jian Chen,Guocheng Du 한국생물공학회 2009 Biotechnology and Bioprocess Engineering Vol.14 No.2

This manuscript aimed at increasing the production of α-ketoglutarate by the multi-vitamin auxotrophic yeast Torulpsis glabrata CCTCC M202019. The carbon flux was redistributed from pyruvate to α-ketoglutarate node by manipulating the specific activity of pyruvate dehydrogenase complex (PDH), pyruvate carboxylase (PC), pyruvate decarboxylase (PDC), and α-ketoglutarate dehydrogenase complex (KGDH). By proper increase of PDH, PC, and PDC activities, α-ketoglutarate in fermentation broth could be accumulated to the levels of 17.1 g/L, 21.6 g/L, and 31.2 g/L, respectively. In addition, decrease in the specific activity of KGDH also resulted in an enhanced α-ketoglutarate synthesis. With a proposed combinational enzymes regulation strategy, the highest α-ketoglutarate concentration of 37.7 g/L was achieved This manuscript aimed at increasing the production of α-ketoglutarate by the multi-vitamin auxotrophic yeast Torulpsis glabrata CCTCC M202019. The carbon flux was redistributed from pyruvate to α-ketoglutarate node by manipulating the specific activity of pyruvate dehydrogenase complex (PDH), pyruvate carboxylase (PC), pyruvate decarboxylase (PDC), and α-ketoglutarate dehydrogenase complex (KGDH). By proper increase of PDH, PC, and PDC activities, α-ketoglutarate in fermentation broth could be accumulated to the levels of 17.1 g/L, 21.6 g/L, and 31.2 g/L, respectively. In addition, decrease in the specific activity of KGDH also resulted in an enhanced α-ketoglutarate synthesis. With a proposed combinational enzymes regulation strategy, the highest α-ketoglutarate concentration of 37.7 g/L was achieved

The Study of XML Functional Dependency and Multi-Valued Dependency and Inference Rules Set

Liu Xiyin,Cao Lijun,Zhongping Zhang 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.6

This paper discusses and defines XML functional dependency and XML multi-valued dependency, making the formal definition of XML functional dependency and XML multi-valued dependency and further defines the XML-trivial functional dependency and multi-valued dependency. It defines the logical implication, base closures and minimal dependence and gives the set of inference rules that effectiveness and completeness are proved when functional dependency and multi-valued dependency exist simultaneously.

Design of Query Reformulation Engine in Data Access and Integration System

Xiyin Liu,Lijun Cao,Zhongping Zhang 보안공학연구지원센터 2016 International Journal of Database Theory and Appli Vol.9 No.4

This paper introduces three core modules of query reformulation engine, mapping document, query reformulation module, and statement conversion module. Mapping document is an XML document that keeps the mapping information between local data source and related data sources; using mapping document, applications could find data sources that have mapping relationship with its local data source. The query reformulation module reformulates the query statements submitted by users to local data resource to query statements to all data sources that have mapping relationship with local data resource. The statement conversion module converts XPath statements to OQL statements that are supported by OGSA-DQP; through OGSA-EDAI in the bottom layer, the access result to the data sources could be obtained. When a user submits an XPath statement to OGSA-DQP, it calls the query reformulation module, which first checks the mapping document to find information of other data sources, then expands and reformulates this XPath statement into query statements that are suitable for the mapped data sources. Afterward, the statement conversion module converts the reformulated XPath statements into OQL statements and returns to OGSA-DQP, which then performs the query operation.

AQUEOUS SYNTHESIS OF HIGH QUANTUM YIELD AND MONODISPERSED THIOL-CAPPED CdxZn1-xTe QUANTUM DOTS BASED ON ELECTROCHEMICAL METHOD

JUNWEI LI,YANG JIANG,YUGANG ZHANG,DI WU,ANQI LUO,ZHONGPING ZHANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.2

A facile green approach has been developed to control the growth regime in the aqueous synthesis of CdxZn1-xTe semiconductor quantum dots (QDs) based on the electrochemistry method. The Low growth temperature and slow injection of Te precursor are used to prolong the diffusion controlled stage and thus suppress Ostwald ripening during the nanocrystal growth. The experimental results showed that a low concentration of Te precursor will definitely influence the growth procedure. The UV–visible absorption spectra, as well as transmission electron microscopy (TEM) shows the QDs a good monodispersity at any interval of the reaction procedure. The high-resolution transmission electron microscopy (HRTEM) images and powder X-ray diffraction (XRD) pattern suggested that the as-prepared QDs have high crystallinity and cubic structure. The size and composition-dependent fluorescent emission wavelength of the resultant CdxZn1-xTe alloyed QDs can be tuned from 460 to 610 nm, and their photoluminescent quantum yield can reach up to 70%. Especially in the wavelength range of 510–578 nm, the overall PL QYs of the as-prepared CdxZn1-xTe QDs were above 50%. The current work suggests that electrochemical method is an attractive approach to the synthesis of high-quality II-VI ternary alloyed semiconductor QDs at large-scale with a prominent cost advantage.

A Simplified Synchronous Pulse-Width Modulation Method for Three-level Inverter of High-speed Train

Fei Lin,Qiaona Lian,Jialiang Yuan,Zhongping Yang,Zhiqiang Zhang,Yue Xu,Jinghai Jiao 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.12

The synchronous Pulse-Width Modulation (PWM) is quite complex for three-level neutral point-clamped (NPC) inverter. A simple central 60° synchronous modulation method is presented in this paper for three-level NPC inverter used in the multi-mode PWM strategy. For the fundamental voltage command, the switching angle could be real-time calculated based on this modulation method with different carrier frequency ratios. The switching strategy between these modes is discussed for multi-mode PWM. According to this method, a simulation model of the drive system with three-level inverter and induction motor is built. The simulation results at asynchronous modulation, central 60° synchronous modulation and square wave area, show that the output voltage values can meet the requirements with a good symmetry even in the case of low carrier frequency ratio. The smooth switching among different modes is also accomplished with low impulse current.

Probing the Key Binding Sequence and Improvement of the Stability of a β-Bungarotoxin-binding Aptamer in Snake Venom

Fengping Ye,Qili Mi,Ning Zhang,Xuemei Li,Jing Yu,Zhongping Gao,Ying Zheng,Quanshui Fan,Jie Wang,Jinglin Wang 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.5

Chemical modifications of the nucleotides can improve the stability of aptamers against enzyme degradation in serum, but it is not clear whether these methods are effective in snake venom. In this study, a DNA aptamer, βB-1, which specifically recognize β-bungarotoxin and Bungarus multicinctus venom was chosen, and the key binding sequence of the aptamer was determined. Based on the secondary structure of the truncated aptamer, locked nucleic acids and 2′-O-methyl nucleotides were applied to modify the stem and loop sequences, respectively. In addition, a 3′-3′-thymidine cap was also adopted to block the 3′ end. It was shown that these chemical modifications can all enhance the stability of the aptamer in snake venom. Simultaneously, modified aptamer with the above modifications in one sequence exhibited a significantly elevated biostability, with the half-life improved from several minutes to 210 min while maintaining its binding affinity to the target.

Microstructural Abnormalities of Basal Ganglia and Thalamus in Bipolar and Unipolar Disorders: A Diffusion Kurtosis and Perfusion Imaging Study

Lianping Zhao,Ying Wang,Yanbin Jia,Shuming Zhong,Yao Sun,Zhifeng Zhou,Zhongping Zhang,Li Huang 대한신경정신의학회 2017 PSYCHIATRY INVESTIGATION Vol.14 No.4

Objective: Bipolar disorder (BD) is often misdiagnosed as unipolar depression (UD), leading to mistreatment and poor clinical outcomes. However, little is known about the similarities and differences in subcorticalgray matter regions between BD and UD. Methods: Thirty-five BD patients, 30 UD patients and 40 healthy controls underwent diffusional kurtosis imaging (DKI) and three dimensional arterial spin labeling (3D ASL). The parameters including mean kurtosis (MK), axial kurtosis (Ka), radial kurtosis (Kr), fractional anisotropy (FA), mean diffusivity (MD), axial diffusivity (Da), radial diffusivity (Dr) and cerebral blood flow (CBF) were measured by using regions-of-interest analysis in the caudate, putamen and thalamus of the subcortical gray matter regions. Results: UD exhibited differences from controls for DKI measures and CBF in the left putamen and caudate. BD showed differences from controls for DKI measures in the left caudate. Additionally, BD showed lower Ka in right putamen, higher MD in right caudate compared with UD. Receiver operating characteristic analysis revealed the Kr of left caudate had the highest predictive power for distinguishing UD from controls. Conclusion: The two disorders may have overlaps in microstructural abnormality in basal ganglia. The change of caudate may serve as a potential biomarker for UD.