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Umematsu T.,NEC Corp | Komeiji S.,NEC Informatec Systems Ltd. | Tsujikawa M.,NEC Corp | Isotani R.,NEC Solution Innovators Ltd.
2016 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, APSIPA 2016 | Year: 2016

We propose a sudden-noise suppression method for speech recognition using a phase linearity feature for noise detection. Our investigation of sound data recorded in actual retail stores shows that short, sudden noises are dominant in such environments. We also confirm the negative effect of such noises on speech recognition performance. Our method addresses this problem by focusing on sudden noises shorter than 0.5 seconds. It takes advantage of a phase feature that has been shown effective for sudden-noise detection. To accurately detect the strike-portion, which is the initial high-power part of a sudden noise, we use two different thresholds. The detected part is replaced with clean data that immediately precedes it in order to remove the noise. Results of a recognition evaluation on speech data with superimposed sudden noises show that the proposed method is effective, especially for noises with clear strike-portions, and that it can reduce the errors caused by those noises by 30-70%. © 2016 Asia Pacific Signal and Information Processing Association.


Kuze A.,Japan Aerospace Exploration Agency | Suto H.,Japan Aerospace Exploration Agency | Shiomi K.,Japan Aerospace Exploration Agency | Urabe T.,Japan Aerospace Exploration Agency | And 5 more authors.
Atmospheric Measurement Techniques | Year: 2012

The Thermal And Near infrared Sensor for carbon Observation Fourier-Transform Spectrometer (TANSO-FTS) onboard the Greenhouse gases Observing SATellite (GOSAT) (nicknamed "Ibuki") has been providing global space-borne observations of carbon dioxide (CO2) and methane (CH4) since 2009. In this paper, we first describe the version V150.151 operational Level 1 algorithms that produce radiance spectra from the acquired interferograms. Second, we will describe the on-orbit characteristics and calibration of TANSO-FTS. Overall function and performance such as signal to noise ratio and spectral resolution are within design objectives. Correction methods of small on-orbit degradations and anomalies, which have been found since launch, are described. Lastly, calibration of TANSO Cloud and Aerosol Imager (TANSO-CAI) are summarized. © 2012 Author(s).


Sasaki W.,Japan Agency for Marine - Earth Science and Technology | Onishi R.,Japan Agency for Marine - Earth Science and Technology | Fuchigami H.,NEC Informatec Systems Ltd | Goto K.,NEC Corp | And 3 more authors.
Geophysical Research Letters | Year: 2016

An observed Madden-Julian Oscillation (MJO) propagating from the central Indian Ocean to the western Pacific from 15 December 2006 to 10 January 2007 was successfully simulated by a cloud-system-resolving global ocean-atmosphere coupled model without parameterization of cumulus convection. We found that the ocean coupling has significant impacts on the MJO simulation, e.g., strength of the moisture convergence, and the timing and strength of the westerly wind burst over the Maritime Continent. The model also generally well simulated the decay of the MJO in the western Pacific, as well as the changes in sea surface temperature. These results demonstrate that the cloud-system-resolving global ocean-atmosphere coupled model can be used for realistic MJO simulation. ©2016. American Geophysical Union. All Rights Reserved.


Masaru A.,Corporate Business Development and Marketing | Eiki I.,NEC Informatec Systems Ltd.
NEC Technical Journal | Year: 2013

This paper discusses a solution that aims to prevent wandering by geriatric patients and also associated accidents. This solution is achieved by combining a motion detection camera and a face recognition camera. The motion detection camera does not detect the entry of people but only those exiting, while the face recognition camera automatically identifies a person who is exiting. When these two cameras are used in conjunction, it is possible to build a system that sends alerts to the staff by detecting the exiting of only those facility residents/users who are in need of nursing care and assistance. Face recognition does not put a burden on the facility residents/users as does the carrying of an RFID tag and it is free from management problems such as loss or equipment failure. Besides, RFID use is more costly because malfunctioning caused by electrical signal leakage must be prevented. The use of a camera is therefore a more rational solution. In addition to describing the system, this paper also discusses the validation testing results.


Okumura A.,NEC Informatec Systems Ltd | Handa S.,NEC Informatec Systems Ltd | Hoshino T.,NEC Informatec Systems Ltd | Nishiyama Y.,NEC Informatec Systems Ltd
Communications in Computer and Information Science | Year: 2016

This paper proposes a system of identity confirmation to issue tickets using face recognition software. This has been socially required to prevent illegal resale, such as ticket scalping. Because illegal resale is a critical problem for popular events in Japan, strict steps are followed for identifying people holding tickets at event venues by visual inspection with ID cards. The task is time-consuming for venue attendants. It is also stressful because ticket holders feel uncomfortable when they are kept waiting. The key points in identification are to verify identities efficiently and to prevent people from impersonating others. The system enables securing the identity of the purchaser and holder of a ticket by using face recognition software. It was proven effective for preventing illegal resale by confirming 50,324 attendees at a large concert of a popular music group. The average accuracy of face recognition was 90%. The average time for identity confirmation was 7 s per person, including guidance to ticket holders, which succeeded in decreasing identity confirmation time by 30% using visual inspection as well as in reducing the psychological workload of venue attendants. © Springer International Publishing Switzerland 2016.


Teramoto R.,NEC Informatec Systems Ltd. | Kashima H.,Tokyo University of Information Sciences
Journal of Molecular Graphics and Modelling | Year: 2010

Accurate prediction of protein-ligand binding affinities for lead optimization in drug discovery remains an important and challenging problem on scoring functions for docking simulation. In this paper, we propose a data-driven approach that integrates multiple scoring functions to predict protein-ligand binding affinity directly. We then propose a new method called multiple instance regression based scoring (MIRS) that incorporates unbound ligand conformations using multiple scoring functions. We evaluated the predictive performance of MIRS using 100 protein-ligand complexes and their binding affinities. The experimental results showed that MIRS outperformed the 11 conventional scoring functions including LigScore, PLP, AutoDock, G-Score, D-Score, LUDI, F-Score, ChemScore, X-Score, PMF, and DrugScore. In addition, we confirmed that MIRS performed well on binding pose prediction. Our results reveal that it is indispensable to incorporate unbound ligand conformations in both binding affinity prediction and binding pose prediction. The proposed method will accelerate efficient lead optimization on structure-based drug design and provide a new direction to designing of new scoring score functions. © 2010 Elsevier Inc.


Onishi R.,Japan Agency for Marine - Earth Science and Technology | Fuchigami H.,NEC Informatec Systems Ltd. | Matsuda K.,Japan Agency for Marine - Earth Science and Technology | Takahashi K.,Japan Agency for Marine - Earth Science and Technology
Flow, Turbulence and Combustion | Year: 2016

This paper reports on the development of a numerical weather simulation model combined with a detailed spectral-bin cloud microphysics model that can explicitly consider the droplet motion and droplet-atmosphere interactions of sea spray. Sea spray is composed of liquid droplets ejected from the sea surface into the evaporation layer, where it enhances heat as well as momentum exchanges between the atmosphere and the sea. In our study, we analyzed the results of idealized 3D simulations to investigate the impact of sea spray on latent heat exchanges and their consequent impact on boundary layer cloud development. The results show that sea spray enhances the latent heat flux by up to 62 % for the surveyed 10m-height velocities, which ranged from 12 to 42 m/s. They also show that sea spray moistening significantly enhances boundary layer cloud development. © 2016 Springer Science+Business Media Dordrecht


A text in a corpus including a set of world wide web (web) pages is analyzed. At least one word appropriate for a document type set according to a voice recognition target is extracted based on an analysis result. A word set is generated from the extracted at least one word. A retrieval engine is caused to perform a retrieval process using the generated word set as a retrieval query of the retrieval engine on the Internet, and a link to a web page from the retrieval result is acquired. A language model for voice recognition is generated from the acquired web page.


A text in a corpus including a set of world wide web (web) pages is analyzed. At least one word appropriate for a document type set according to a voice recognition target is extracted based on an analysis result. A word set is generated from the extracted at least one word. A retrieval engine is caused to perform a retrieval process using the generated word set as a retrieval query of the retrieval engine on the Internet, and a link to a web page from the retrieval result is acquired. A language model for voice recognition is generated from the acquired web page.


Patent
Nec Informatec Systems Ltd. | Date: 2010-04-21

A design rule check system includes: a design rule check unit that performs a design rule checks on wiring information which indicates a wiring pattern of a net on the basis of a design rule which includes a constraint condition of a wiring pattern; and a screening processing unit which generates information about an error for each clock frequency of each net based on a result of the design rule check and outputs the information to an indicating device.

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