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Table of Content

      
    20 September 2015
    Volume 50 Issue 09
    UVB damage and protection effect of ascorbic acid on human corneal endothelial cells in vitro
    WEN Qian, FAN Ting-jun
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(09):  1-6.  doi:10.6040/j.issn.1671-9352.0.2015.197
    Abstract ( 351 )   PDF (4420KB) ( 312 )   Save
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    To postulate the damage effect of UVB and the protection effect of antioxidant ascorbic acid(Asc), the oxidantive effect of UVB, the protective effect of Asc, and the related molecular mechanisms were investigated systematically using an in vitro model of non-transfected human corneal endothelial(HCE) cells in this study. After HCE cells were exposed to UVB irradiation and/or Asc, the viability and morphology were examined by MTT assay and light microscopy, DNA oxidative damage was detected by 8-hydroxydeoxyguanosine immunofluorescent staining, and the level of reactive oxygen species(ROS) was assayed by dihydroethidium staining. Our results showed that 100~800 mj/cm2 UVB irradiation could decline the viability of HCE cells in a dose-and time-dependent manner. UVB at 200 mj/cm2(the average dose of UVB in natural sunlight) could induce cell shrinkage, oxidative damage of DNA, and elevation of ROS level significantly. Whereas, 1 mmol/L Asc, with significant enhancing effects on the viability and proliferation of HCE cells, could significantly reduce the oxidative damage of DNA and the ROS level in 200 mj/cm2 UVB-irradiated HCE cells. In conclusion, UVB irradiation has a significant damaging effect on HCE cells by inducing DNA oxidative damage via ROS generation, while Asc has an obvious protecting effect on UVB-irradiated HCE cells by eleminatingDNA oxidative damage via inhibiting ROS generation. These findings can be used as certain theory guidance in protecting HCE cells from UVB-induced oxidative damage by employing Asc and the other antioxidants.
    The Influence of boundary friction factors on geometry of two-dimensional granular systems
    YANG Lin, HU Lin, ZHANG Xing-gang
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(09):  7-12.  doi:10.6040/j.issn.1671-9352.0.2015.043
    Abstract ( 359 )   PDF (4410KB) ( 455 )   Save
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    The force situation and sliding channel are very complicated when particle system is squeezed. The mechanical response and structure changes of two-dimensional lattice pile system of granular material in the process of being pressed were experimentally investigated. The structure collapse and self-organization behavior of the particle system were observed when being squeezed. Based on the experimental results, the relationship between the horizontal pressure distribution, the sliding channel or the reorganization structure and the stacking angle as well as the boundary friction factor was discussed. According to the theory of statics, different force mechanisms about the boundary particle and the central one were analyzed. Studies have shown that compared with rough wall, smooth wall is easier to become a sliding channel for particles, so the force chain formed by the particles is unstable, which means it will easily lead to structural collapse.The friction factor on side wall wouldn't have a significant impact about the stress distribution at different heights. In fact, the recombination of force chain is the main factor leading to stress redistribution at different heights.
    Multi-dimensional semantic ontology construction oriented to knowledge-level application
    LIU Jian, XU Hong-bo, YI Mian-zhu, CHENG Xue-qi
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(09):  13-20.  doi:10.6040/j.issn.1671-9352.3.2015.145
    Abstract ( 434 )   PDF (1896KB) ( 584 )   Save
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    Ontology, as the carrier, is introduced into the field of information science. It can solve the problems of knowledge representation and knowledge organization. Based on the theory of semantic ontology, a multi-dimensional semantic ontology model was proposed, which conceptualized the world knowledge from different dimensions. It presented the abstraction level of knowledge and established the semantic relevance of knowledge among different languages and different fields. On this basis, multi-dimensional semantic ontology was constructed, which solved the key problem about the lack of semantic knowledge and multi-language relation. Furthermore, multi-dimensional semantic ontology was analyzed and horizontal compared. And the main problems and challenges in construction process in the future were discussed.
    Chinese-Japanese multi-word phrase extraction and alignment based on multi-strategy filtering
    TANG Liang, LI Qian, XU Hong-bo, YI Mian-zhu
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(09):  21-28.  doi:10.6040/j.issn.1671-9352.3.2014.016
    Abstract ( 569 )   PDF (1440KB) ( 348 )   Save
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    On the task of cross-language text analysis, a multi-word phrase is less ambiguous and more accurate than a single word, which helps to understand the text more accurately. Existing methods mainly focus on cross-language alignment of single words. This paper presents an extraction and alignment method for Chinese-Japanese multi-word phrases based on multi-strategy filtering, which combines the multi-word phrases extraction and cross-language alignment. Firstly, we get multi-word phrases with complete semantics using repeated string, left-right adjacent entropy, internal relationship, multi-word nesting, stop-word method etc. Secondly, we use the parallel corpus to compute the similarity of Chinese-Japanese multi-word phrases, to achieve cross-language alignment. In the process, according to the rules and characteristics of the Japanese language, we dynamically adjust the threshold according to corpus' size and related domains, in order to improve the applicability of multi-word phrases. The experimental results show that this method is effective to extract Chinese-Japanese multi-word phrases as the alignment unit, which makes the semantic expression more complete and more practical value.
    Hybrid recommendation by combining network-based algorithm and user preference
    ZHANG Xin-meng, JIANG Sheng-yi, ZHANG Qian-sheng, XIE Bo-lin, LI Xia
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(09):  29-35.  doi:10.6040/j.issn.1671-9352.3.2014.232
    Abstract ( 506 )   PDF (1882KB) ( 691 )   Save
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    Recommendation algorithms based on heat conduction or mass diffusion first obtain the relationship between objects according to network structure, then predict the user's favorite objects based on these relationships, but these algorithms ignore user's preference. In order to overcome this defect, the TF-IDF approach was used to construct user's preference according to the tags contained in the objects selected by user, and the mean of preference of object's tags was taken as the preference of the object, then a hybrid recommendation model was proposed by combining network-based algorithm and the user preference model. The benchmark datasets, MovieLens, was used to evaluate our algorithm, and the experimental results demonstrate that hybrid algorithm can significantly improve accuracy, diversification and personalization of recommendations.
    Micro-blogging topic mining based on supervised LDA user interest model
    WANG Li-ren, YU Zheng-tao, WANG Yan-bing, GAO Sheng-xiang, LI Xian-hui
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(09):  36-41.  doi:10.6040/j.issn.1671-9352.3.2014.287
    Abstract ( 522 )   PDF (998KB) ( 654 )   Save
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    The content of users Micro-blogging can reflect users' interests. Forwarding, commenting, replying and other behavior about Micro-blogging have a strong guiding role to discovering users' interests. In order to using Micro-blogging behavior effectively, we proposed users' interest modeling method based on supervised-LDA Micro-blogging contents. First of all,through analyzing the impact elements, including forwarding, commenting, replying, and other behavior, four constraint relations were defined. Second, based on the contents of Micro-blogging, the four constraint relations were put into the LDA model and the supervised-LDA Micro-blogging theme generation model were constructed. And then the distribution of the users' theme and the users' interests' model were obtained. The experimental results show that compared with the LDA method, this model has high accuracy, and the four introduced guiding information have a significant role in discovering Micro-blogging users' interests.
    Security analysis and improvement of two certificateless aggregate signature schemes
    FAN Ai-wan, XIA Dong-liang, YANG Zhao-feng
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(09):  42-48.  doi:10.6040/j.issn.1671-9352.0.2014.539
    Abstract ( 387 )   PDF (800KB) ( 291 )   Save
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    The security flaws and low computational efficiency problem exist in most of the aggregate signature schemes. Based on the security analysis of two kinds of certificateless aggregate signature scheme, it is found that the two schemes can not resist forgery attack under Type I and Type II. Aiming at this sort of problems, we proposed an improved scheme that has changed the combination mode of parameters in the process of signature and has strengthened the constraints of master key and the public key in the process of aggregate signature verification. It was proved that the prosed scheme is existentially unforgeable against adaptive chosen message attacks under the computational Diffie-Hellman assumption in the random oracle model. The efficiency analysis shows that the scheme needs only 4 bilinear pairing operations in the signature process and the verification process, and the length of the signature is fixed. This improved scheme is more efficient comparing with the other certificateless aggregate signature schemes in similar secure level.
    Linear properties of the round function of SIMON family of block ciphers
    DONG Xiang-zhong, GUAN Jie
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(09):  49-54.  doi:10.6040/j.issn.1671-9352.0.2015.070
    Abstract ( 483 )   PDF (836KB) ( 523 )   Save
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    SIMON is a family of the lightweight Feistel block ciphers designed by the U.S National Security Agency in 2013. We analyze the linear properties of the F-function F(x) and propose the sufficient conditions for correlation coefficient being 0 and 1/2k respectively when the quadratic terms of the linear approximations are independent. We also give the relationship between the correlation coefficient and the input-output masks when the quadratic terms are not independent.
    Research on model of stochastic inventory control under carbon emission trading mechanism
    GUI Yun-miao, SHEN Jun, HU Hong-chun, LIU Zhao-qi
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(09):  55-60.  doi:10.6040/j.issn.1671-9352.0.2015.109
    Abstract ( 317 )   PDF (1267KB) ( 273 )   Save
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    To avoid a disastrous influence caused by global warming, carbon emissions trading mechanism has become a generally accepted means of controlling carbon emissions. A model of stochastic inventory control was developed under carbon emission trading mechanism. And the changes of the optimal quantity and expected costs under different conditions were analyzed. The result is showed that when carbon price increases, the optimal quantity ordered will reduce; when carbon emissions permission increases, the optimal quantity ordered will stable, and expected costs will decrease. A numerical example is illustrated that the carbon emissions trading mechanism makes the government attach more attentions to firm micro level of energy conservation and emissions reduction, guides the enterprises to reduce carbon emissions.
    Empty container reposition optimization with the corporation of the shipping lines
    WANG Chuan-xu, WANG Wan, CHEN Fei-yan, XU Chang-yan
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(09):  61-68.  doi:10.6040/j.issn.1671-9352.0.2015.010
    Abstract ( 399 )   PDF (1464KB) ( 348 )   Save
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    With the consideration of fuzzy random empty container demand and supply as well as the corporation of different shipping companies in the same port, and without the limit of empty container lease, a multi-stage port container inventory level optimization model based on the minimization of expected container logistics total cost is developed. A numerical example is given to demonstrated the effectiveness of the proposed model and compare the models with shipping companies corporation and without shipping companies corporation. At last, the impacts of empty container lease cost, holding cost, empty container demand variation and demand fuzzy degree on port logistics cost and container inventory level are analyzed.
    Multicriteria equilibrium model of a server-oriented internet with the market share
    ZHOU Yan, HAN Rui-jing, DOU Jie, LIU Chao-chao, SUN Hao
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(09):  69-77.  doi:10.6040/j.issn.1671-9352.0.2014.290
    Abstract ( 306 )   PDF (1140KB) ( 284 )   Save
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    A multicriteria equilibrium model of a server-oriented internet with quality competition consisting of the service providers, the network transport providers and the demand markets was designed. The service providers provide substitutable(but not quality identical) services to the demand markets by the net work transpert providers the custemers of the demand markets select the service randomly according to the price. The service providers compete with quantity and quality in a Nash manner to maximize their profits as well as their market share. The network transport providers compete with prices in a Bertrand manner. The two types of competition were unified in a Stackelberg game. The multicriteria equilibrium model of the server-oriented internet was established by variational inequality method based on the game theory bi-level programming and stochastic utility theory. Final, the algorithm were proposed and the numerical examples were solved to test the efficiency of the model and the effect of the market share.
    Discounted penalty function for a thinning risk model with dividend
    CHEN Jie, LÜ Yu-hua
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(09):  78-83.  doi:10.6040/j.issn.1671-9352.0.2014.373
    Abstract ( 383 )   PDF (795KB) ( 301 )   Save
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    The thinning risk model with barrier dividend was considered. The integro-differential equation for the expected discounted penalty function was obtained. If the premium and the claim sizes are exponentially distributed, some expressions for the Laplace transform of the integro-differential equation were founded. When the premium and the claim sizes are exponentially distributed, the closed-form solutions of the time of ruin, the deficit at ruin and the surplus before ruin were obtained.
    Inequalities for Casorati curvatures of submanifolds in a riemannian manifold of quasi-constant curvature
    PAN Xu-lin, ZHANG Pan, ZHANG Liang
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(09):  84-87.  doi:10.6040/j.issn.1671-9352.0.2014.495
    Abstract ( 386 )   PDF (1372KB) ( 345 )   Save
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    By using the optimization methods on submanifolds, we obtain the inequalities of Casorati curvatures for submanifolds of a Riemanifold manifold of quasi-constant curvature, which generalize the known results.
    Coexistence solutions for a predator-prey model with additive Allee effect and a protection zone
    LI Hai-xia
    JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE). 2015, 50(09):  88-94.  doi:10.6040/j.issn.1671-9352.0.2014.582
    Abstract ( 295 )   PDF (808KB) ( 309 )   Save
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    A diffusive predator-prey model with additive Allee effect and a protection zone is discussed. Firstly, the stability of trivial and semi-trivial solutions is investigated. Secondly, the non-existence of non-constant positive solutions is determined. Finally, the existence of non-constant positive solutions is obtained by using the global bifurcation theory. Under weakly Allee effect, the results indicate that the two species will coexist and the coexistence solutions are stable when the diffusion coefficient is suitably chosen and the parameters satisfy certain conditions. Furthermore, the two species cannot coexist when the diffusion coefficients are sufficiently large.