Lei

National Taiwan University, T’ai-pei, Taipei, Taiwan

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Publications (57)12.91 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Recent studies of causal relations have reported faster verification if two words appear in “cause–effect” order than if they appear in “effect–cause” order. The current study investigated whether such differences are specific to causal relations or exist for other types of asymmetric relations, such as hierarchical relations. Participants were asked to decide whether two simultaneously presented words were causally related or hierarchically related, when the word pair was vertically aligned (Experiment 1) or horizontally aligned (Experiment 2). Both causal and hierarchical relationships were verified faster if “cause”/“superordinate-level” appeared vertically above “effect”/“subordinate-level” than the reverse. However, if word pairs were presented horizontally, only causal relationships were verified faster when cause preceded effect. People appear to represent the causal asymmetry based on temporal order when queried about causal relationships, whereas the representation of hierarchical asymmetry is based on spatial arrangement when queried about hierarchical relationships
    Journal of Cognitive Psychology 06/2014; 26:559-570.
  • Jin, Dong, Lei, Zhou, Zhang
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    ABSTRACT: This study was conducted to investigate the effects of dietary supplementation of glutamine (Gln) and mannan oligosaccharides (MOS) on plasma endotoxin and acute phase protein concentrations and nutrient apparent digestibility in finishing steers. Eighteen Simmental×Luxi crossbred finishing steers were randomly and evenly divided into three treatments: (1) the basal diet (control); (2) the basal diet + 1% Gln; (3) the basal diet + 0.2% MOS. The results showed: dietary supplementation of Gln decreased the plasma and fecal lipopolysaccharide (LPS) by 7.10% and 12.49%, respectively, but the differences did not attain statistical significance (P>0.05). The plasma concentrations of haptoglobin (Hp), serum amyloid A (SAA), and C-reactive protein (CRP) were not affected (P>0.05), but the plasma concentration of LPS binding protein (LBP) was increased (PPPPPP>0.05), respectively. Dietary supplementation of Gln and MOS had no effects on nutrient apparent digestibility (P>0.05). Overall, MOS is more effective than Gln in decreasing the concentrations of LPS in plasma and feces, and the plasma acute phase proteins are affected in different manners by Gln and MOS supplementation.
    Journal of Applied Animal Research 01/2014; 42(2). · 0.12 Impact Factor
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    Zhang, Yang, Chen, Zhu, Lei, Song, Dai, Sun, Jiang, Nie
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    ABSTRACT: In order to investigate the pathogenic mechanisms of parvovirus B19 in human colorectal cancer, plasmids containing the VP1 or VP2 viral capsid proteins or the NS1 nonstructural proteins of parvovirus B19 were constructed and transfected into primary human colorectal epithelial cells and LoVo cells. Differential gene expression was detected using a human genome expression array. Functional gene annotation analyses were performed using Database for Annotation, Visualization and Integrated Discovery v6.7 software. Gene ontology (GO) analyses revealed that VP1related functions included the immune response, immune system process, defense response and the response to stimulus, while NS1associated functions were found to include organelle fission, nuclear division, mitosis, the Mphase of the mitotic cell cycle, the mitotic cell cycle, Mphase, cell cycle phase, cell cycle process and cell division. Pathway expression analysis revealed that VP1associated pathways included cell adhesion molecules, antigen processing and presentation, cytokines and the inflammatory response. Moreover, NS1associated pathways included the cell cycle, pathways in cancer, colorectal cancer, the wnt signaling pathway and focal adhesion. Among the differential genes detected in the present study, 12 genes were found to participate in general cancer pathways and six genes were observed to participate in colorectal cancer pathways. NS1 is a key molecule in the pathogenic mechanism of parvovirus B19 in colorectal cancer. Several GO categories, pathways and genes were selected and may be the key targets through which parvovirus B19 participates in colorectal cancer pathogenesis.
    Oncology letters 01/2014; 8(2). · 0.24 Impact Factor
  • Tserng, Chen, Huang, Lei, Tran
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    ABSTRACT: Recently, the high incidence of construction firm bankruptcies has underlined the importance of forecasting defaults in the construction industry. Early warning systems need to be developed to prevent or avert contractor default; additionally, this evaluation result could facilitate the selection of firms as collaboration or investment partners. Financial statements are considered one of the key basic evaluation tools for demonstrating firm strength. This investigation provides a framework for assessing the probability of construction contractor default based on financial ratios by using the Logit model. A total of 21 ratios, gathered into five financial groups, are utilized to perform univariate logit analysis and multivariate logit analysis for assessing contractor default probability. The empirical results indicate that using multivariate analysis by adding market factor to the liquidity, leverage, activity and profitability factors can increase the accuracy of default prediction more than using only four financial factors. While considering the market factor in the multivariate Logit model, clear incremental prediction performance appears in 1-year evaluation. This study thus suggests that the market factor comprises important information to increase the prediction performance of the model when applied to construction contractors, particularly in short-term evaluation.
    Journal of Civil Engineering and Management 01/2014; 20(2). · 2.02 Impact Factor
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    ABSTRACT: Acute myocardial infarction remains one of the leading causes of death and disability worldwide. The mechanisms underlying myocardial infarction involve a complex of signaling molecules, such as tumor necrosis factor α (TNFα), interleukin-6 (IL6), C-Myc, atria natriuretic peptide (ANP), superoxide dismutase 1 (SOD1), and so on. The aim of this study is to understand the time-dependent expressional pattern of these early responsible genes following acute myocardial ischemia established by left anterior descending (LAD) coronary artery ligation. After LAD ligation, a collection of genes was detected using real-time polymerase chain reaction (PCR). The expression of inflammation-related genes, such as TNFα and IL6, was immediately upregulated at 2 h, reached to the highest point at 12 h, and then decreased to nearly basis level at 24 h after ligation, suggesting inflammation appeared and disappeared rapidly after acute ischemia. C-Myc, an important transcription factor, was significantly upregulated at 2 h, and thereafter persisted at high level to 24 h. The secretary peptide, ANP, was consistently upregulated from 2 to 24 h, reached to 40-folds at 24 h. The calcium-regulated gene, FK506-binding protein 12.6, was not significantly altered after ischemia. SOD1 was not altered at the first 4 h, and began to downregulate at 12 and 24 h. These results indicate that several genes were dynamically and transiently regulated after acute myocardial infarction (AMI) in a time-dependent pattern, suggesting that there is an immediate molecular response to acute myocardial ischemia, which might provide us a new insight to understand molecular mechanisms of AMI.
    Animal cells and systems the official publication of the Zoological Society of Korea 01/2014; 18(3). · 0.64 Impact Factor
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    Insect Science 06/2012; · 1.79 Impact Factor
  • European Journal of Pharmacology 09/2009; 617:23-27. · 2.59 Impact Factor
  • Conference Paper: Learning to tag
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    ABSTRACT: Social tagging provides valuable and crucial information for large-scale web image retrieval. It is ontology-free and easy to obtain; however, irrelevant tags frequently appear, and users typically will not tag all semantic objects in the image, which is also called semantic loss. To avoid noises and compensate for the semantic loss, tag recommendation is proposed in literature. However, current recommendation simply ranks the related tags based on the single modality of tag co-occurrence on the whole dataset, which ignores other modalities, such as visual correlation. This paper proposes a multi-modality recommendation based on both tag and visual correlation, and formulates the tag recommendation as a learning problem. Each modality is used to generate a ranking feature, and Rankboost algorithm is applied to learn an optimal combination of these ranking features from different modalities. Experiments on Flickr data demonstrate the effectiveness of this learning-based multi-modality recommendation strategy.
    01/2009
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    ABSTRACT: In Latin American countries, political instability is not uncommon: in particular, the transfer of power is not always subject to normal terms of election. In these circumstances, market expectations must not only take into account the commitment of the present government, but also incorporate future decisions of its potential successor. This could increase country risk even when the incumbent government is fully committed to a pegged exchange rate, particularly if the successor government is known to be considering devaluation and strategic default. We develop a model suitable for situations of political instability and substantial dollarisation --- both pervasive factors in emerging markets. The former has been studied by Alesina et al. (1996), who defines political instability as the tendency of a government to collapse (Using a sample of 113 countries for the period 1950 through 1982 they find that in periods of such instability growth is significantly lower than otherwise.); and Annett (2001) has shown how political instability in emerging markets is linked to racial and religion divisions. "Dollarization, defined as the holding by residents of foreign currency and foreign currency-denominated deposits at domestic banks'' has been at the centre of the debate on "original sin'' (Eichengreen & Hausmann 1999). Dollarisation may appear an attractive monetary regime for checking inflation, but if a country has an exchange rate misalignment, the possibility of a financial crisis becomes an issue (Calvo, 2002). In the present model it is assumed that the country under analysis has two possible governments with different ideologies and policy preferences: the existing government, who is fully committed to maintaining the peg, and the successor government which has a low cost of switching to float. Market expectations of a change of government can undermine the effectiveness of the most committed policy-maker: and sovereign spreads can rise even when a currency board is fully supported by the current administration. This paper provides an explicit pricing of such risk when political instability is given exogenously. The Argentinean crisis is used to illustrate the argument. Argentina had a fixed exchange regime and the contractual structure was very much dollarised (Galiani, Heymann & Tommasi 2002), with 2/3 of commercial debt in dollars (IADB, 2004) (Calvo, Izquierdo & Talvi 2003). This left Argentina very vulnerable to a sudden stop. Argentina in 2001 was in a fixed exchange rate regime with a completely committed and fully credible policy-maker to maintain it: Mr Cavallo. Nevertheless, during 2001 the country suffered high country risk and a deep financial crisis, see Figure 1. Hence the issue: why high country risk, even if the current government was fully committed to maintain the peg? The confused nature of the transfer of power in the Argentine case is underlined by the fact that there were 5 presidents in 10 days: and that President Duhalde was only regarded as a care-taker, precluded from running for office when the next round of elections were held in 2003 (Bruno, 2004). Lack of political legitimacy, coming after capital flight had stripped off the central bank of its dollar reserves, could help to explain the chaotic end to convertibility. These could prove interesting extensions to the political economy approach adopted here.
    01/2009;
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    ABSTRACT: We use the Variable Infiltration Capacity (VIC) land surface macroscale hydrology model driven by observed maximum and minimum air temperatures and precipitation to map daily soil moisture values over China for the period 1 January 1971 to 31 July 2005. The model is applied over a grid of 10 458 points with a resolution of 30 km x 30 km. The model is first calibrated using observed hydrographs from 35 catchments with drainage areas varying from 190 to 351 530 km2. The model is then validated over these 35 catchments at different periods, and over an additional eight catchments with drainage areas ranging from 1230 to 10 010 km2. An estimation procedure to determine model parameters is developed and applied to catchments where hydrographs are not available for the standard calibration process. In situ soil moisture measurements from 28 sites around the country are also used for model validation. VIC performs well over both calibration and validation catchments especially in humid and semi-humid regions. The 35-year soil moisture climatology for the top 1 m from VIC is consistent with known soil moisture conditions in China.[Traduit par la rédaction] Nous utilisons le modèle hydrologique macroscopique de surface à capacité d'infiltration variable (VIC) piloté par les températures maximales et minimales de l'air et les précipitations observées pour cartographier les valeurs quotidiennes d'humidité du sol en Chine durant la période allant du 1er janvier 1971 au 31 juillet 2005. Le modèle est appliqué sur une grille de 10 458 points dont la résolution est de 30 km x 30 km. Le modèle est d'abord étalonné à l'aide d'hydrogrammes observés provenant de 35 bassins hydrologiques dont l'aire de drainage varie entre 190 et 351 530 km2. Le modèle est ensuite validé à ces 35 bassins hydrologiques pour différentes périodes ainsi qu'à huit autres bassins hydrologiques dont l'aire varie entre 1 230 et 10 010 km2. Nous définissions une méthode d'estimation permettant de déterminer les paramètres du modèle et nous l'appliquons aux bassins hydrologiques pour lesquels nous ne disposons pas d'hydrogrammes pour le processus d'étalonnage de référence. Nous utilisons aussi des mesures d'humidité du sol faites sur place à 28 sites dans le pays pour la validation du modèle. Le modèle VIC donne de bons résultats tant dans les bassins hydrologiques d'étalonnage que de validation, en particulier dans les régions humides et semi-humides. La climatologie de 35 ans de l'humidité du sol dans le premier mètre fournie par le modèle VIC est compatible avec les conditions connues d'humidité du sol en Chine.
    ATMOSPHERE-OCEAN. 03/2007; 45:37--45.
  • Chen, Lee, Lin, Yeh, Wang, Lei
    IEEE Electron Device Letters 11/2006; 27(11):893-895. · 2.79 Impact Factor
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    ABSTRACT: Search engines are playing a more and more important role in discovering information on the web nowadays. Spam web pages, however, are employing various tricks to bamboozle search engines, therefore achieving undeserved ranks. In this paper, we propose a new page importance metric, which takes both the content quality and the link quality into consideration. Based on this metric, we can judge the trust scores of all the web pages using the web link graph. Experimental results running on over 15 million web pages show that our method can filter out spam and identify reputable sites effectively.
    01/2006
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    ABSTRACT: To study the variation between wheat bymovirus isolates and to resolve uncertainties about the identity of the virus in some countries, leaves of infected plants were obtained from nine sites in China and from one each in Italy, Germany, USA and Canada. The German isolate was obtained from rye and the Canadian isolate was the type strain of wheat spindle streak mosaic virus (WSSMV). In RT-PCR, using primers designed from a partial sequence of a French isolate (tentatively described as WSSMV), genome fragments were obtained from the Italian and the French isolates but not from the Chinese ones. Conversely, products were consistently obtained from the Chinese isolates, but not from the Italian or French ones, when primers were designed from the sequence of a Japanese isolate of wheat yellow mosaic virus (WYMV). Nucleotide sequences were obtained from regions at or near the 3′-terminus of RNA1 of six Chinese isolates and the four from Europe and North America, usually including the coat protein. Nucleotide and amino acid sequence comparisons demonstrated that the European and North American isolates were extremely similar and were therefore WSSMV, while the Chinese isolates were close to the Japanese isolate and were thus WYMV.
    Plant Pathology 01/2002; 48(5):642 - 647. · 2.73 Impact Factor
  • Zhang, Lei
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    ABSTRACT: In the ever-increasing efforts to leverage the performance of microprocessors, effects of conditional branches are one of the biggest obstacles in gaining significant speedups. A wide variety of branch prediction schemes have been developed to reduce the branch penalties. However, even the most effective prediction strategies exhibit certain mis-prediction rates due to their design. Branch decoupled architecture, a compiler-assisted architecture exploiting a special model of instruction-level parallelism in general-purpose programs, has been proposed as analternative. In the proposed architecture, a program is decoupled at compile time into two instruction streams which run on a two-execution-unit processor. The expectation of decoupling is that the branch stream could solve the branch conditions and branch target addresses for the program stream in advance, then the program stream rarely experiences branch stalls. In this thesis, we concretize the conceptual branch decoupled architecture. We develop an evaluation platform, including a branch decoupling compiler, branch decoupled libraries and binary utilities, and a branch decoupled scalar processor simulator. Preliminary results show that on average 43% of the branches are resolved before they are needed in the P-stream. This number is up to 81% for integer benchmarks. Results also suggest that the performance can be improved by incorporating memory aliasing analysis. Typescript (photocopy). Thesis (M.S.)--Iowa State University, 1999. Includes bibliographical references.
    01/1999;
  • Chen, Lei
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    ABSTRACT: Computer-produced typeface. Thesis (M.S.)--New Mexico State University, 1995. Includes vita. Includes bibliographical references (leaf 46).
    08/1996;
  • Yang, Lei
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    ABSTRACT: Abstract. Typescript. Thesis (M.S.)--Auburn University, 1986. Vita. Includes bibliographical references (leaves 135-138).
  • Chen, Lei
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    ABSTRACT: Thesis (M.S.)--Indiana University, 2005.
  • Zhang, Lei, M.Phil
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    ABSTRACT: Title proper from title frame. Thesis (M. Phil.)--University of Hong Kong, 2004. Text (Electronic book) Mode of access: World Wide Web.
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    Chen, Lei
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    ABSTRACT: Includes vita. Thesis (Ph. D.)--University of Texas at Dallas, 2004. Includes bibliographical references (leaves 65-68).
  • Zhang, Lei
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    ABSTRACT: Typescript. Thesis (Ph. D.)--University of Missouri-Columbia, 1999. Vita. Includes bibliographical references (leaves 138-148). Microfilm.

Publication Stats

86 Citations
12.91 Total Impact Points

Institutions

  • 2014
    • National Taiwan University
      • Department of Civil Engineering
      T’ai-pei, Taipei, Taiwan
    • Urumqi General Hospital of Lanzhou Military Region
      Ha-mi-ch’eng-chen, Xinjiang Uygur Zizhiqu, China
  • 2006
    • Peking University
      Peping, Beijing, China
  • 2002
    • Zhejiang Academy of Agricultural Sciences
      Zhegang, Jiangxi Sheng, China