Research on Collaborative Filtering Algorithm based on Cloud Computing

Dan Zhang 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.7

In order to solve this problem of cloud model, this paper presents another new collaborative filtering recommendation algorithm by combining the item classification and cloud model. Firstly the algorithm utilizes the item classification information and cloud model to compute items inner-similarity, and then gets the scores from neighbor items which have the highest similarity and uses their scores to forecast the unrated inner-class items. Secondly, the neighbors of user are obtained by computing the inner-class user similarities in the cloud model, providing the final forecast grade and carrying out the recommendation.

Chemical constituents and their acetyl cholinesterase inhibitory and antioxidant activities from leaves of Acanthopanax henryi: potential complementary source against Alzheimer's disease

Zhang, Xiao Dan,Liu, Xiang Qian,Kim, Yang Hee,Whang, Wan Kyunn 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.5

The aim of this study was to investigate chemical constituents of the leaves of Acanthopanax henryi, and their antioxidant, acetyl cholinesterase inhibitory activities. Caffeoyl quinic acid derivates and flavonoids were obtained from A. henry, through column chromatography technologies, and the content of major constituents was determined by the HPLC-UV method. Anti-oxidant activity of the isolated metabolites was evaluated by free radical scavenging (DPPH, ABTS radicals) and superoxide anion scavenging. The results showed that di-caffeoyl quinic acid derivates had stronger antioxidant activity than positive controls (ascorbic acid, trolox and allopurinol). Acetyl cholinesterase inhibitory activity was estimated on the constituents, among which, quercetin, 4-caffeoyl-quinic acid and 4,5-caffeoyl quinic acid were found to have strong acetyl cholinesterase inhibitory activity with $IC_{50}$ values ranging from 62.6 to $121.9{\mu}M$. The present study showed that some of the tested constituents from the leaves of A. henryi exhibit strong antioxidant and acetyl cholinesterase inhibitory effects. This suggest that the leaves of A. henryi can be used as a new natural complementary source of acetyl cholinesterase inhibitors and anti-oxidant agents, thus being a promising potential complementary source against Alzheimer's disease.

Research of Regional Forest Fire Prediction Method based on Multivariate Linear Regression

Dan Liu,Yanrong Zhang 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.1

In order to achieve the predicted speed, high accuracy, the use of simple purpose, forest fire prediction of the key issues is to choose the main predictors. Forest fire prediction involves many factors, some of which are stable factors such as climate, topography, forest characteristics; and some unstable factors, such as fuel moisture content, meteorological factors, and other sources of ignition. Currently leading factor in the prediction of forest fire is often used in the fuel moisture, precipitation or dry days, relative humidity, temperature and wind five factors. In this paper, some of the data Yichun fire nearly a decade predict the forest fire meteorological data analysis, using multivariate linear regression to derive forest fire prediction method in the wireless sensor networks.

前衛時裝和前衛時裝革新

( Dan Zhang ),( C. Anthony Di Benedetto ) 한국마케팅과학회 2010 Journal of Global Fashion Marketing Vol.1 No.4

This is a study of the related concepts of radical fashion and radical fashion innovation. Radical fashions are defined here as those that may never enter the market at all, and exist primarily on runway shows, in exhibitions and in publicity; by contrast, radical fashion innovations may be very successful in the marketplace. Radical fashions represent a clear break from the old designs, as opposed to incremental fashions, which are defined as an extension or evolution of the old designs. Using this definition, radical fashion seems to be at odds with the definition of marketable fashion. Nevertheless, while most radical fashions do not enter the market at all and live only in runway shows, exhibitions, and museums, there are many examples of radical fashion innovations successful in the market. Accordingly, a series of questions rise: What is radical fashion? What is radical fashion innovation? What are the differences and similarities between these, and how are they connected? This study seeks to address these questions, using a foundation developed in the radical product innovation literature. Fashion innovations may be in terms form or function, or style, and can be radical (involving the breaking down of old ideas) or incremental (involving the evolution of new ideas from old ideas). We draw from the radical product innovation literature to build two related models. The first is a model of radical fashion and radical fashion innovation that illustrates the components of both concepts. The second is a model of radical fashion innovation diffusion, drawn from the general product innovation diffusion literature, which explores the evolution of and the connections between these two concepts from the beginning (i.e., the radical fashion) to the end (i.e., success in the mass market). Radical fashion may result in designs that are more suitable for the runway, catalogues, or even museum display, than for actual wear. Radical fashion has sometimes been called "new ideas before their marketing phase." Radical fashion may successfully enter the market, however, and gain wide acceptance among consumers. The transition from radical fashion to radical fashion innovation is not too different from the transition from invention to innovation, which is familiar to researchers in product innovation. Notable in this transition process is the fact that, for many product innovations, what drives the first customers to purchase (the "Visionaries," to use Moore`s terminology in his "crossing the chasm" model of innovation diffusion) may be very different from what drives the rest of the market (the "Pragmatists."). If this "chasm" or divide between the two market segments is not recognized, the innovating firm may find that their product stalls during the diffusion process and never effectively reaches the mass market. In the case of fashion products, visionaries (such as celebrities and the fashion press) prime the market and create favorable word of mouth; yet, at the same time, less-radical, wearable designs may be seen on the runway, or may be manufactured for the mass market and sold through department stores, specialty clothing stores, or even discounters. The most successful worldwide designers instinctively know this, and can continuously produce radically innovative fashion which also usually transitions to the mass market successfully. They recognize the need to reach the visionaries successfully to generate sufficient publicity and word of mouth, and also to use product design, promotion, and distribution strategies, as well as appropriate price lining policies, to reach the mass market (the pragmatists) effectively. We conclude with generalized findings and managerial implications for firms in the fashion industry. We attempt to bring the radical innovation literature, and its understanding of the process of radical innovation diffusion in the marketplace, to the expanding discussion of fashion marketing success strategic development.

Key role of peptidoglycan on acrylamide binding by lactic acid bacteria

Dan Zhang,Wei Liu,Liang Li,Hong-Yu Zhao,Hong-Yang Sun,Ming-Han Meng,Sheng Zhang,Mei-Li Shao 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.1

The primary purpose of this study was to analyze the ability of four peptidoglycan (PGN) from different lactic acid bacteria to bind acrylamide (AA) and to identify the binding mechanism. In this study, to clarify the possible binding interactions among AA and components of PGN, chemical components, surface structure, amino acids component, and functional groups of peptidoglycans were studied. It was found that PGN from Lactobacillus plantarum 1.0065 had the highest ability to bind AA with 87%. Furthermore, a significant positive relation was found between the carbohydrate content of PGN and percentage of bind AA, and the content of four specific amino acids of PGN and AA binding ability were also positive correlated. Thereinto, alanine of PGN had a significant impact on AA binding among four amino acids. Additionally, the C–O (carboxyl, polysaccharides, and arene), C=O amide, and N–H amines groups of PGN were involved in AA binding.

Experimental and numerical studies on mechanical behavior of buried pipelines crossing faults

Dan F. Zhang,Xue M. Bie,Xi. Zeng,Zhen. Lei,Guo F. Du 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.75 No.1

This paper presents a study on the mechanical behavior of buried pipelines crossing faults using experimental and numerical methods. A self-made soil-box was used to simulate normal fault, strike-slip fault and oblique slip fault. The effects of some important parameters, including the displacement and type of fault, the buried depth and the diameter of pipe, on the deformation modes and axial strain distribution of the buried pipelines crossing faults was studied in the experiment. Furthermore, a finite element analysis (FEA) model of spring boundary was developed to investigate the performance of the buried pipelines crossing faults, and FEA results were compared with experimental results. It is found that the axial strain distribution of those buried pipelines crossing the normal fault and the oblique fault is asymmetrical along the fault plane and that of buried pipelines crossing the strike-slip fault is approximately symmetrical. Additionally, the axial peak strain appears near both sides of the fault and increases with increasing fault displacement. Moreover, the axial strain of the pipeline decreases with decreasing buried depth or increasing ratios of pipe diameter to pipe wall thickness. Compared with the normal fault and the strike-slip fault, the oblique fault is the most harmful to pipelines. Based on the accuracy of the model, the regression equations of the axial distance from the peak axial strain position of the pipeline to the fault under the effects of buried depth, pipe diameter, wall thickness and fault displacement were given.

Fatigue characteristics of distributed sensing cables under low cycle elongation

Dan Zhang,Jiacheng Wang,Bo li,Bin Shi 국제구조공학회 2016 Smart Structures and Systems, An International Jou Vol.18 No.6

When strain sensing cables are under long-term stress and cyclic loading, creep may occur in the jacket material and each layer of the cable structure may slide relative to other layers, causing fatigue in the cables. This study proposes a device for testing the fatigue characteristics of three types of cables operating under different conditions to establish a decay model for observing the patterns of strain decay. The fatigue characteristics of cables encased in polyurethane (PU), GFRP-reinforced, and wire rope-reinforced jackets were compared. The findings are outlined as follows. The cable strain decayed exponentially, and the decay process involved quick decay, slow decay, and stabilization stages. Moreover, the strain decay increased with the initial strain and tensile frequency. The shorter the unstrained period was, the more similar the initial strain levels of the strain decay curves were to the stabilized strain levels of the first cyclic elongation. As the unstrained period increased, the initial strain levels of the strain decay curves approached those of the first cyclic elongation. The tested sensing cables differed in the amount and rate of strain decay. The wire rope-reinforced cable exhibited the smallest amount and rate of decay, whereas the GFRP-reinforced cable demonstrated the largest.

Collaborative Filtering Algorithm based on User in Cloud Computing

Dan Zhang 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.12

The user-based collaborative filtering algorithm has been widely used in various kinds of personalized recommendation systems. But it has a serious shortcoming: with the increasing number of the users and commodities, its calculation work grows rapidly. To address the problem of vast time consumption by big dataset, we utilize MapReduce programming idea to do parallelized transformation of the algorithm; finally deploy it to be run in Hadoop cloud computing platform. Experiments have revealed that if computing data is reasonably distributed and the data volume is big, then the algorithm performance of the algorithm can realize favorable linearly speeding effect.

Suppressive Effect of Sinomenine Combined with 5-Fluorouracil on Colon Carcinoma Cell Growth

Zhang, Ji-Xiang,Yang, Zi-Rong,Wu, Dan-Dan,Song, Jia,Guo, Xu-Feng,Wang, Jing,Dong, Wei-Guo Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.16

It is reported that sinomenine (SIN) and 5-fluorouracil (5-FU) both are effective for colon cancer, but their cooperative suppressive effects and toxicity remain to be clarified in detail. This study aimed to determine suppressive effects and toxicity of sinomenine (SIN) plus 5-fluorouracil (5-FU) on LoVo colon carcinoma cells in vitro and in vivo. CCK-8, Hoechst 33258 staining and an annexin V-FITC/PI apoptosis kit were used to detect suppressive effects. Western blotting was applied to investigate the essential mechanism underlying SIN and 5-FU-induced apoptosis. SIN or 5-FU or both were injected into nude mice, and then suppressive effects and side effects were observed. SIN plus 5-FU apparently inhibited the proliferation of LoVo cells and induced apoptosis. Moreover the united effects were stronger than individually (p<0.05). The results of annexin V-FITC/PI staining and Hoechst 33258 staining showed that the percentage of apoptotic cells induced by SIN and 5-FU combined or alone was significantly higher than the control group (p<0.05). Expression of Bax and Bcl-2 was up-regulated and down-regulated respectively. SIN or 5-FU significantly inhibited effects on the volume of tumour xenografts and their combined suppressive effects were stronger (p<0.05). No obvious side effects were observed. It was apparent that the united effects of SIN and 5-FU on the growth of colorectal carcinoma LoVo cells in vitro and in vivo were superior to those using them individually, and it did not markedly increase the side effects of chemotherapy.

A New Unsymmetrical Zinc Phthalocyanine as Photosensitizers for Dye-sensitized Solar Cells

Zhang, Dan,Zhang, Xue-Jun,Zhang, Lei,Mao, Li-Jun Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.4

A new unsymmetrical zinc phthalocyanine has been designed and synthesized based on the 'push-pull' and extended ${\pi}$-conjugation concept for the dye-sensitized solar cells. Three tert-butoxy groups, which act as electron releasing ('push'), enhance the solubility of phthalocyanine in common organic solvents and reduce the aggregation. Hydroxy substituted 9,10-anthraquinones act as electron acceptors ('pull') for the study of photoinduced electron transfer processes as well as grafting onto nanocrystalline $TiO_2$. The new unsymmetrical zinc phthalocyanine was fully characterized by FTIR, UV-vis, $^1H$ NMR, cyclic voltammetry and differential pulse voltammetry. The new sensitizer was tested in dye-sensitized solar cells, and gave a better performance.