The Efficacy Analysis of Endoscopic Third Ventriculostomy in Infantile Hydrocephalus

He, Zhenhua,An, Caixia,Zhang, Xinding,He, Xiaodong,Li, Qiang The Korean Neurosurgical Society 2015 Journal of Korean neurosurgical society Vol.57 No.2

Objective : To investigate the efficacy of endoscopic third ventriculostomy (ETV) for infantile hydrocephalus. Methods : Retrospectively reviewed the 17 infantile hydrocephalus cases who were treated with ETV between July 2009 and June 2013. The study includes 17 patients (4 Han and 13 Hui) between the ages of 51 and 337 days. Five cases with encephalitis history and 2 cases with cerebral hemorrhage, with the remaining 10 cases congenital hydrocephalus. ETVs were performed for all patients with 1 case failing because the severe ventricle inflammatory adhesion, excessive exudation, and vague basilar artery. Results : Among the 16 successful cases 7 cases improved remarkably : heads and ventricles reduced and cerebral cortexes thickening morphologically. The ventricles of the remaining cases were unchanged. Conclusion : The ethnic minority account for the majority of the patients in this study. ETV is effective for infantile obstructive hydrocephalus.

A Formal Method of CPU Resources Scheduling in the Cloud Computing Environment

Xiaodong Liu,Huating Xu,Li He 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.1

In the virtualization based cloud computing environment, multiple computers are allowed to run as virtual machines (VM) in a single physical computer. Efficient scheduling of limited underlying resources has been a key issue. This paper presents a formal method of CPU resources scheduling (FRS). VMs are divided into three resources statuses according to resources requirements and their run information. FRS scheduling is formally scheduling CPU resources according to the resources statuses. The implementation of FRS is confined to the VMM layer, without VM dependency. The evaluation shows that idle CPU resources of VMs are be used by those VMs which need more CPU resources and the CPU resources overall utilization is improved.

SAXS investigations of the fractal character of additive silica xerogels

Fei He,Xiaodong He,Mingwei Li,Sumei Zhang 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.4

Two-step acid-base catalyzed silica xerogels with different amounts of additives, including TiO2 powder, silica xerogel powders and short glass fibers, were prepared through a sol-gel route and ambient pressure drying. The fractal dimensions of these additive silica xerogels were investigated by the means of small-angle X-ray scattering (SAXS). Specific surface area and the average chord length were calculated by the Debye method. The changes of the porous structure were compared between the pure silica xerogels and the impure ones. The results show that additive silica xerogels do not possess a surface fractal character. The mass fractal range of silica xerogels decreases and colloid particle size increases with an increase of additives. The adding of excessive silica xerogel powders results in agglomeration of particles which goes beyond the metrical limit of SAXS. The mass fractal dimension and fractal range decrease with the addition of additional short fibers. The shrinkage was restrained in the course of drying by adding short fibers Two-step acid-base catalyzed silica xerogels with different amounts of additives, including TiO2 powder, silica xerogel powders and short glass fibers, were prepared through a sol-gel route and ambient pressure drying. The fractal dimensions of these additive silica xerogels were investigated by the means of small-angle X-ray scattering (SAXS). Specific surface area and the average chord length were calculated by the Debye method. The changes of the porous structure were compared between the pure silica xerogels and the impure ones. The results show that additive silica xerogels do not possess a surface fractal character. The mass fractal range of silica xerogels decreases and colloid particle size increases with an increase of additives. The adding of excessive silica xerogel powders results in agglomeration of particles which goes beyond the metrical limit of SAXS. The mass fractal dimension and fractal range decrease with the addition of additional short fibers. The shrinkage was restrained in the course of drying by adding short fibers

The flow structure prediction of an oil diffusion vacuum pump by computational fluid dynamics method

Xiaodong WANG,He LI,Xiyue CHENXING 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8

Formal Description of the Virtual Machines System Framework

Xiaodong Liu,Li He,Hating Xu 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.3

Virtual resources have the duality of hardware and software, which brings new challenges to virtual resources management and manipulation. There is urgent need for formally describing virtual resources in order to effectively reason about virtual resources allocation, scheduling and management. This paper describes the virtual resources and their dynamic behavior. We first give the formal definition of the resources pool and the virtual machine (VM). Then, we describe the dynamic behavior of VMs. In particular, we present a formal description of how virtual resources are used by VMs. This paper reveals the logical laws of virtual resources and their dynamic behaviors and makes the virtualization theory system more rigorous.

Online Hot Topic Detection Based on Segmented Timeline and Aging Theory

Ruiguo Yu,Xiaodong Xie,Yongxing Li,Mankun Zhao,Xuyuan Dong,Muwen He,Peng Chang,Zan Wang 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.2

With a great deal of digitized textual information now available on the internet, it is almost impossible for people to assimilate all the information timely. Therefore, the technologies of topic detection and tracking are used for constructing news topics from news stories in order to bring convenience to people. However, traditional topic detection methods are not always so effective in detecting emerging hot news topics in a short period of time, and most topic detection methods use single-pass clustering algorithm which is with low accuracy and very sensitive to the input sequence of news documents. In order to improve clustering accuracy, we utilize a temporal distance factor to segment timeline into equal parts and propose a novel two-times single-pass clustering algorithm to deal with news stories in each part of timeline separately. Moreover, the aging theory is combined with our approach to build life-span model of topics from which we can obtain variation trend of hotness value of topics. The results of experiments show that our approach is effective and the life circle model of topics established by our method can conform to reality well.

Effect of Fe nanoparticle-loaded sawdust carbon on catalytic pyrolysis of heavy oil

Yitang Zhong,Xiaodong Tang,Jingjing Li,Bin He,Zhiqi Zhang,Tingbing Chen 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.4

This work was focused on the synthesis and characterization of iron nanoparticle loaded sawdust carbon(Fe/SC) by low cost green synthesis approach and its application for catalytic pyrolysis of heavy oil. Fourier transforminfrared (FT-IR), X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS),transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and inductively coupled plasmaoptical emission spectrometer (ICP-OES) methods were used to analyze the catalyst of Fe/SC. The properties of heavyoil before and after reaction were characterized by SARA analysis, FT-IR, gas chromatography-mass spectrometry (GCMS)and thermogravimetric analysis (TGA). The experimental results showed that after pyrolytic reaction at 350 oC for30 min with 0.1 wt% catalyst, the viscosity of heavy oil may decrease by 80.81% with a net efficiency of catalyst of20.68%. The catalyst of Fe/SC is promising, low cost, high efficiency, highly stable and eco-friendly for catalytic upgradingand viscosity reduction of heavy oil.

A harmonic movable tooth drive system integrated with shape memory alloys

Lizhong Xu,Zongxing Cai,Xiaodong He 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.23 No.4

Continuous rotating SMA actuators require motion conversion mechanisms, so their structure is relatively complex and difficult to realize the miniaturization. Here, a new type of continuous rotating actuator driven by SMA is proposed. It combines the movable tooth drive with SMA drive. The structure and working principle of the integrated movable tooth drive system is introduced. The equations of temperature, stress and strain of memory alloy wires, and the output torque of drive system are given. Using these equations, the temperature, the output forces of the SMA wires, and output torque of the drive system are studied. Results show that the compact drive system could give large output torque. To obtain large output torque plus small fluctuation, large eccentricity and small diameter of the SMA wire should be taken. Combined application of ventilation cooling and high current can increase the rotary speed of the drive system.

Raman scattering investigations on Co-doped ZnO epitaxial films: Local vibration modes and defect associated ferromagnetism

Qiang Cao,Shumin He,Yuanyuan Deng,Dapeng Zhu,Xiaodong Cui,Guolei Liu,Huai-Jin Zhang,Shishen Yan,Yanxue Chen,Liangmo Mei 한국물리학회 2014 Current Applied Physics Vol.14 No.5

Raman scattering spectroscopy has been performed on high quality Co-doped ZnO epitaxial films, which were grown on Al2O3 (0001) by oxygen-plasma assisted molecular beam epitaxy. Raman measurements revealed two local vibration modes (LVMs) at 723 and 699 cm1 due to the substitution of Co2þ in wurtzite ZnO lattice. The LVM at 723 cm1 is found to be an elemental sensitive vibration mode for Co substitution. The LVM at 699 cm1 can be attributed to enrichment of Co2þ bound with oxygen vacancy, the cobalteoxygen vacancyecobalt complexes, in Zn1xCoxO films associated with ferromagnetism. The intensity of LVM at 699 cm1, as well as saturated magnetization, enhanced after the vacuum annealing and depressed after oxygen annealing.

Heteroatoms in situ-doped hierarchical porous hollow-activated carbons for high-performance supercapacitor

Yan Rui,Wang Kai,Tian Xiaodong,Li Xiao,Yang Tao,Xu Xiaotong,He Yiting,Lei Shiwen,Song Yan 한국탄소학회 2020 Carbon Letters Vol.30 No.3

Heteroatoms in situ-doped hierarchical porous hollow-activated carbons (HPHACs) have been prepared innovatively by pyrolyzation of setaria viridis combined with alkaline activation for the frst time. The micro-morphology, pore structure, chemical compositions, and electrochemical properties are researched in detail. The obtained HPHACs are served as outstand�ing electrode materials in electrochemical energy storage ascribe to the particular hierarchical porous and hollow structure, and the precursor setaria viridis is advantage of eco-friendly as well as cost-efective. Electrochemical measurement results of the HPHACs electrodes exhibit not only high specifc capacitance of 350 F g−1 at 0.2 A g−1, and impressive surface specifc capacitance (Cs) of 49.9 μF cm−2, but also substantial rate capability of 68% retention (238 F g−1 at 10 A g−1) and good cycle stability with 99% retention over 5000 cycles at 5 A g−1 in 6 M KOH. Besides, the symmetrical supercapacitor device based on the HPHACs electrodes exhibits excellent energy density of 49.5 Wh kg−1 at power density of 175 W kg−1 , but still maintains favorable energy density of 32.0 Wh kg−1 at current density of 1 A g−1 in 1-ethy-3-methylimidazolium tetrafuoroborate (EMIMBF4) ionic liquid electrolyte, and the excellent cycle stability behaviour shows the nearly 97% ratio capacitance retention of the initial capacitance after 10,000 cycles at current density of 2 A g−1. Overall, the results indicate that HPHACs derived from setaria viridis have appealing electrochemical performances thus are promising electrode materi�als for supercapacitor devices and large-scale applications.