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Pengyan Zhang,,Xing Ren,Qianqian Zhang,Jianjian He,Yongmin Chen 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.1
Rural health care reformed in the new situation in China, indicating that the construction of medical facilities not only to solve difficult medical problems, but also to take into account the efficiency and fairness of the use of medical resources allocation. Facing these problems, the paper aims to assess the spatial distribution of rural medical services by using geographic information systems (GIS) and spatial accessibility indexes. Lankao County in Henan Province and 21 hospitals of township and county are selected as study samples. First adopted ArcGIS10.0 to collate data. Second, the authors established a network dataset to analysis the maximum coverage for hospital services space accessibility. At last, established Huff model and built a scientific evaluation for the current hospitals’ distribution. There are several findings from the case study. First, the distribution of medical facility is unbalanced in rural areas in term of per capita, such as opportunity for assessing medical services and the convenience of utilizing medical services. Second, by using the Huff Model to calculate the potential population in service regions, the Huff Model to calculate the potential population in service regions, the results showed the low efficiency of the use of medical resources and the problems in these regions.
Jianjian Zhang,Shiteng Suo,Guiqin Liu,Shan Zhang,Zizhou Zhao,Jianrong Xu,Guangyu Wu 대한영상의학회 2019 Korean Journal of Radiology Vol.20 No.5
Objective: To compare various models of diffusion-weighted imaging including monoexponential apparent diffusion coefficient (ADC), biexponential (fast diffusion coefficient [Df], slow diffusion coefficient [Ds], and fraction of fast diffusion), stretched-exponential (distributed diffusion coefficient and anomalous exponent term [α]), and kurtosis (mean diffusivity and mean kurtosis [MK]) models in the differentiation of renal solid masses. Materials and Methods: A total of 81 patients (56 men and 25 women; mean age, 57 years; age range, 30–69 years) with 18 benign and 63 malignant lesions were imaged using 3T diffusion-weighted MRI. Diffusion model selection was investigated in each lesion using the Akaike information criteria. Mann–Whitney U test and receiver operating characteristic (ROC) analysis were used for statistical evaluations. Results: Goodness-of-fit analysis showed that the stretched-exponential model had the highest voxel percentages in benign and malignant lesions (90.7% and 51.4%, respectively). ADC, Ds, and MK showed significant differences between benign and malignant lesions (p < 0.05) and between low- and high-grade clear cell renal cell carcinoma (ccRCC) (p < 0.05). α was significantly lower in the benign group than in the malignant group (p < 0.05). All diffusion measures showed significant differences between ccRCC and non-ccRCC (p < 0.05) except Df and α (p = 0.143 and 0.112, respectively). α showed the highest diagnostic accuracy in differentiating benign and malignant lesions with an area under the ROC curve of 0.923, but none of the parameters from these advanced models revealed significantly better performance over ADC in discriminating subtypes or grades of renal cell carcinoma (RCC) (p > 0.05). Conclusion: Compared with conventional diffusion parameters, α may provide additional information for differentiating benign and malignant renal masses, while ADC remains the most valuable parameter for differentiation of RCC subtypes and for ccRCC grading.
Ziyin Zhang,Kun Yang,Chaohua Wang,Changwei Zhang,Xiaodong Xie,Jianjian Tang 대한영상의학회 2013 Korean Journal of Radiology Vol.14 No.3
This report concerns a 4-month-old infant with progressive prominent and redness of his left eye since birth. This report concerns a 4-month-old infant with progressive prominent redness of his left eye since birth. Angiography revealed a congenital pial arteriovenous fistula between the temporal branch of the left posterior cerebral artery and left cavernous sinus through the sphenoparietal sinus, a condition not reported in the literature. The fistula was successfully occluded with two micro-coils by vertebrobasilar approach.
Pengyan Zhang,Jianjian He,Wang Huili,Zhimin Zhou 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.9
With the acceleration of urbanization, the resources and environment problem has become more and more prominent in Zhongyuan urban agglomerations. Based on evaluation model of resources and environment coordination degree of Pressure-State-Response (PSR), this study adopted the coordination degree analysis methods to calculate and evaluate the resources and environment coordinated development of nine central cities in Zhongyuan Urban Agglomerations from 2006 to 2013. Results showed that: (1) from 2006 to 2013, the statuses of the nine central cities in Zhongyuan Urban Agglomerations were in moderate coordination, elementary coordination, on the verge of imbalance and moderate imbalance, the economic development and the resources and environment statuses were not optimistic; (2) from 2006 to 2009, those cities’ statuses were in moderate imbalance, on the verge of imbalance and elementary coordination, the overall development coordination degree was not high, could not reach the state of coordinated development. Luoyang, Jiaozuo, Xuchang and Luohe’s coordinated development situation was not up to standard, whose status was in moderate imbalance; (3) from 2010 to 2013, the nine cities were on the verge of imbalance, elementary coordination and moderate coordination, coordinated development was improved.
Fu, Jianjian,Zhang, Teng Fei,Xia, Qixun,Lim, Sung-Hwan,Wan, Zhixin,Lee, Taeg-Woo,Kim, Kwang Ho Hindawi Limited 2015 Journal of nanomaterials Vol.2015 No.-
<P>Nanolaminated MAX-phase Ti2AlC thin films were synthesized by high-power impulse magnetron sputtering (HiPIMS) from a MAX-phase Ti2AlC target. The amorphous matrix Ti-Al-C films were deposited at room temperature, while the MAX-phase Ti2AlC films were obtained through annealing process of the as-deposited amorphous matrix films. The microstructure, oxidation resistance, and corrosion behavior of these two films were comparatively investigated. The results indicated that the MAX-phase Ti2AlC films had superior antioxidation and anticorrosion properties than the amorphous matrix Ti-Al-C films, which is attributed to the rapid formation of dense Al2O3layer on the top of MAX-phase Ti2AlC films because of the rapid diffusion of Al atoms in the typical nanolaminated structure of MAX phase.</P>
Axial Hole Air-Entraining Cooling Technique of Radial-Flow Turbines
Ma Chao,Zhang Jianjian,Wang Ningning,Zhu Zhifu 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.5
In response to the continually increasing thermal load caused by the rising gas temperature in the inlet of radial-flow turbines, this paper proposes the use of axial hole air-entraining cooling to cool the turbine shaft and turbo wheel back-disc. The cooling effect of this technique, as well as its influence on the aerodynamic performance of turbines, were investigated through numerical simulations. The results demonstrate that the axial hole air-entraining cooling technique can significantly improve the local cooling efficiency of the turbine back-disc. Under a blowing ratio of 0.25 %, the local cooling efficiency increased by 154 %, and the temperature decreased by up to 233 K. The maximum temperature on the surface of the turbine shaft at the floating bearing location decreased significantly, thus reducing the coking risk of the lubricating oil. When the blowing ratio was within 0.5 %, the impact of this cooling technique on the overall turbine performance was negligible.
Culture of a Whole Porcine Liver Ex Situ without Red Blood Cells
( Jing Dong ),( Lingling Xia ),( Hefang Shen ),( Congwen Bian ),( Sujin Bao ),( Ming Zhang ),( Yan Dai ),( Yanhong Xu ),( Qiru Xiong ),( Jianjian Xu ),( Lili Xu ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: Liver transplantation is an effective approach to end-stage liver disease. Shortage of donor liver and increased waiting time for liver transplantation necessitate the development of an organ culture system by which livers can be cultured and maintained ex situ for a prolonged period of time. The aim of this work is to test whether cell culture condition in vitro could be used to culture whole livers ex situ without the use of erythrocytes. Methods: Eight castrated male land race/farm young porcine livers were exposed to 30 min warm ischemia and 30 min cold perfusion. Livers were isolated and connected to an ex situ liver culture system using a standard culture medium RPMI 1640 supplied with 10% of fetal calf serum and sufficient dissolved oxygen under a normothermic condition for 6 hours. Metabolic biomarkers, bile and urea production, hepatic cell viability, and histology analysis of biopsies were performed and analyzed. Results: Dissociated porcine hepatic cells survived and grew in vitro under the standard RPMI 1640 culture medium. When the same RPMI 1640 medium supplemented with 10% of FCS and sufficient oxygen was used to culture livers ex situ, over 98% of liver cells were viable for at least 6 hours during ex situ whole organ culture based on the results from biochemical assays. Conclusions: Our data demonstrate that the liver culture system established in this work can be used to culture whole livers ex situ in the absence of erythrocytes.