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Search Results: 1 - 10 of 25724 matches for " Feifei Lee and Tadahiro Ohmi "
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A Codebook Design Method for Robust VQ-Based Face Recognition Algorithm  [PDF]
Qiu Chen, Koji Kotani, Feifei Lee, Tadahiro Ohmi
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.32015
Abstract: In this paper, we present a theoretical codebook design method for VQ-based fast face recognition algorithm to im-prove recognition accuracy. Based on the systematic analysis and classification of code patterns, firstly we theoretically create a systematically organized codebook. Combined with another codebook created by Kohonen’s Self-Organizing Maps (SOM) method, an optimized codebook consisted of 2×2 codevectors for facial images is generated. Experimental results show face recognition using such a codebook is more efficient than the codebook consisted of 4×4 codevector used in conventional algorithm. The highest average recognition rate of 98.6% is obtained for 40 persons’ 400 images of publicly available face database of AT&T Laboratories Cambridge containing variations in lighting, posing, and expressions. A table look-up (TLU) method is also proposed for the speed up of the recognition processing. By applying this method in the quantization step, the total recognition processing time achieves only 28 msec, enabling real-time face recognition.
Fast Search for MPEG Video Clips from Large Video Database Using Combined Histogram Features
Feifei Lee,Koji Kotani,Qiu Chen,Tadahiro Ohmi
Lecture Notes in Engineering and Computer Science , 2010,
A Local Search Method Using Histogram Features for Fast Retrieval of DNA Sequences
Qiu Chen,Koji Kotani,Feifei Lee,Tadahiro Ohmi
Lecture Notes in Engineering and Computer Science , 2010,
International Journal of Bioinformatics Research , 2011,
Abstract: DNA sequence search is a fundamental topic in bioinformatics. The Smith-Waterman algorithmachieved highest accuracy among various sequence alignment tools, but it usually spends much computationaltime to search on large DNA sequence database. On the contrary, BLAST and FASTA have improved the searchspeed by using heuristic approaches, by there is a possibility of missing an alignment or giving inaccurate output.This paper presents an efficient hierarchical method to improve the search speed while the accurate is being keptconstant. For a given query sequence, firstly, a fast histogram based method is used to scan the sequences in thedatabase. A large number of DNA sequences with low similarity will be excluded for latter searching. The Smith-Waterman algorithm is then applied to each remainder sequences. Experimental results show the proposedmethod combining histogram information and Smith-Waterman algorithm is a more efficient algorithm for DNAsequence search
Qiu Chen, Koji Kotani, Feifei Lee and Tadahiro Ohmi
International Journal of Bioinformatics Research , 2012,
Abstract: DNA sequence search is a very important topic in bioinformatics algorithm development. However, this task usually spends much computational time to search on large DNA sequence database. In this paper, we propose an efficient hierarchical DNA sequence search algorithm to improve the search speed while the accuracy is being kept constant. For a given query DNA sequence, firstly, a fast local search algorithm using histogram features is used as a filtering mechanism before scanning the sequences in the database. An overlapping processing is newly added to improve the robustness of the algorithm. A large number of DNA sequences with low similarity will be excluded for latter searching. The Smith-Waterman algorithm is then applied to each remainder sequences. Experimental results using GenBank sequence data show the proposed algorithm combining histogram information and Smith-Waterman algorithm is more efficient for DNA sequence search.
Government R & D Subsidies, Political Relations and Technological SMEs Innovation Transformation  [PDF]
Feifei Yu
iBusiness (IB) , 2013, DOI: 10.4236/ib.2013.53B022

This paper studies the effect of government research and development (R&D) subsidies and political relations on the innovative activities of technological small and medium-sized enterprises (SMEs). Moreover, the technology innovation path of SMEs is an important issue related to government R&D subsidies. This paper explores these effects using multiple case studies. Through case analyses of four biological pharmaceutical enterprises, we found that first, technological SMEs that receive a significant amount of government R&D subsidies will transform from exploitative innovation to explorative innovation in a short amount of time, whereas technological SMEs that receive less government R&D subsidies will perform less innovative activities over a long time. Second, technological SMEs with strong political relations tend to do more explorative innovation, whereas technological SMEs with weak political relations tend to do more exploitative innovation. Third, technological SMEs with strong political relations will promote the positive effect of government R&D subsidies on their innovation performance.

The Retailers’ Choices of Profit Strategies in a Cournot Duopoly: Relative Profit and Pure Profit  [PDF]
Feifei Zheng
Modern Economy (ME) , 2017, DOI: 10.4236/me.2017.82014
Abstract: To investigate the influence of the relative performance on retailers’ choices of profit strategies, a Cournot competition model composed of two private retailers is proposed, in which retailers are facing the problem of choosing a strategy from pure profit and relative profit. The study shows that, 1) when its competitor pursues relative profit, the retailer will adopt pure profit strategy if the degree of relative performance of its competitor is high enough. Otherwise, the retailer will adopt the relative profit strategy. 2) The more relative profit-maximizing retailers there are, the more intense market competition will be, the lower market price will decrease. 3)?Under a certain degree of relative performance, the strategy profiles (relative profit, relative profit), (relative profit, pure profit) and (pure profit, relative profit) are all likely to be Nash equilibrium, except the strategy profile (pure profit, pure profit).
Electron cloud effects: codes and simulations at KEK
K. Ohmi
Physics , 2013, DOI: 10.5170/CERN-2013-002.219
Abstract: Electron cloud effects had been studied at KEK-Photon Factory since 1995. e-p instability had been studied in proton rings since 1965 in BINP, ISR and PSR. Study of electron cloud effects with the present style, which was based on numerical simulations, started at 1995 in positron storage rings. The instability observed in KEKPF gave a strong impact to B factories, KEKB and PEPII, which were final stage of their design in those days. History of cure for electron cloud instability overlapped the progress of luminosity performance in KEKB. The studies on electron cloud codes and simulations in KEK are presented.
Beam-beam effects under the influence of external noise
K. Ohmi
Physics , 2014, DOI: 10.5170/CERN-2014-004.69
Abstract: Fast external noise, which gives fluctuation into the beam orbit, is discussed in connection with beam-beam effects. Phase noise from crab cavities and detection devices (position monitor) and kicker noise from the bunch by bunch feedback system are the sources. Beam-beam collisions with fast orbit fluctuations with turn by turn or multi-turn correlations, cause emittance growth and luminosity degradation. We discuss the tolerance of the noise amplitude for LHC and HL-LHC.
Effects of Improving Public Services for Tourism Developments in Islands: The Case of Remote Islands in Nagasaki, Japan  [PDF]
Tadahiro Okuyama, Hayato Ishihara
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.36018
Abstract: Growths of numbers of tourists who stay long-term in tourism sites are an important policy for local governments in islands due to their locations that are far from urban areas. However, many tourists hesitate to stay long-term in islands owing to not only the expensive travel costs but also the lack of public services in islands. The purpose of this study is to examine effects of improving public services in islands for tourists’ willingness to pays (WTPs) and non-tourists’ attitudes for long-term stays. Data on tourism activity for islands, Nagasaki, Japan were used. Respondents were asked about their WTPs for long-term stays and their needs for public services of islands; reductions of costs for rent or purchasing houses for long-term stays and travel costs, easy to take a vacation, to enhance medical services, educational services and job search services. The logit model was used for estimations. Median and mean values of WTPs (per year) were calculated JPY 151,629 (USD 1184) and JPY 242,110 (USD 3008). Positive effects on five public services (without travel costs) were confirmed. For example, the median values of WTPs were increased to JPY 478,369 (USD 5943) when the medical services were improved, and JPY 1,484,704 (USD 18,446) when all public services were improved. The results showed that improvement of public services have the effect 1) to improve tourists’ benefits and 2) to change many non-tourists’ attitudes from the rejection of staying long term in islands to the acceptance. Thus, results indicate that it would be better for central and/or local governments in islands to enhance islands’ public services.
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