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Institution

NEC

CompanyTokyo, Japan
About: NEC is a company organization based out in Tokyo, Japan. It is known for research contribution in the topics: Signal & Layer (electronics). The organization has 33269 authors who have published 57670 publications receiving 835952 citations. The organization is also known as: NEC Corporation & NEC Electronics Corporation.


Papers
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Patent
Teruyuki Higuchi1
02 Sep 2004
TL;DR: A fingerprint input device as mentioned in this paper is an image sensor which responds to the scattered light emanating from a finger, which is generated inside a finger having a fingerprint pattern in accordance with external light.
Abstract: A fingerprint input apparatus includes an image sensor which responds to scattered light emanating from a finger. The scattered light is generated inside a finger having a fingerprint pattern in accordance with external light. The sensor may be a two-dimensional image sensor made of a large number of light-receiving elements arranged in a two-dimensional array or a one-dimensional sensor made of a large number of light-receiving elements arranged in a line-type array. In the latter case, the fingerprint is input by swiping the finger across the image sensor and reconstructing the fingerprint image. The fingerprint input apparatus is used to control use of a variety of devices, including electronic devices such as cellular telephones and personal computers, and access to buildings, rooms, safes and the like. The fingerprint input apparatus makes possible the elimination of personal identification numbers (PINs) and signatures in a variety of transactions.

130 citations

Patent
Kazuhiro Okanoue1
01 Apr 1991
TL;DR: In this paper, a branch metric is obtained by summing branch metric coefficients derived from channel estimates respectively with the output of the matched filters or by summifying branch metric coefficient derived from a vector sum of channel estimates with the matched filter outputs.
Abstract: In a space diversity receiver, matched filters and a like number of channel estimators are respectively coupled to diversity antennas to receive sequentially coded symbol sequences. A branch metric calculator receives the outputs of the matched filters and the estimates from the channel estimators to calculate a branch metric of the received sequences for coupling to a maximum likelihood (ML) estimator. The branch metric is obtained by summing branch metric coefficients derived from channel estimates respectively with the output of the matched filters or by summing branch metric coefficients derived from a vector sum of channel estimates with the matched filter outputs. In another embodiment, adaptive channel estimators are provided for deriving channel estimates from received sequences and the output of an ML estimator. First branch metrics are derived from the received sequences and supplied to a branch metric quality estimator in which quality estimates of the channels are derived from the first branch metrics. An evaluation circuit evaluates the first branch metrics according to the quality estimates and produces a second branch metric for coupling to the ML estimator.

130 citations

Patent
Shinichi Manabe1
04 Sep 1992
TL;DR: In this paper, a digital mobile communications system which maintains synchronization among sending data of base stations, measures the time delay of radio waves from mobile stations under control at the control base station, and instructs the value of time delay to each mobile station to adjust the timing of sending data, to establish synchronization of communications between the base station and the mobile stations.
Abstract: A digital mobile communications system which maintains synchronization among sending data of base stations, measures the time delay of radio waves from mobile stations under control at the control base station and instructs the value of time delay to each mobile station to adjust the timing of sending data of mobile stations to establish synchronization of communications between the base station and the mobile stations, wherein the system comprises means for measuring at mobile stations relative time delays of radio waves from at least one base station other than the control base station with respect to the radio waves from the control base station and periodically reporting the relative time delays to the control base station, and means for calculating at the base station the distances between the mobile station and the base stations and further determining the current geographic positions of the mobile station.

130 citations

Proceedings ArticleDOI
J. Tsukumo1, H. Tanaka
14 Nov 1988
TL;DR: A description is given of the classification of handprinted Chinese characters, using correlation methods for fast classification and a nonlinear normalization based on uniform relocation of the strokes used to form the character.
Abstract: A description is given of the classification of handprinted Chinese characters, using correlation methods for fast classification and a nonlinear normalization based on uniform relocation of the strokes used to form the character. Experimental results for handprinted Chinese character classification are presented. High classification capability, at 97.36% for the recognition rate and 99.44% for the rough classification was achieved for a large data set (ETL8), which includes 881 handprinted Chinese characters and 160 character patterns per character. A 94.42% recognition rate was achieved for a larger data set (ETL9B), which includes 2965 handprinted Chinese characters. >

130 citations

Journal ArticleDOI
01 Jun 1999
TL;DR: With these study results, it is believed the Web users would like to build and organize a larger collection of bookmarks for future references than they can reasonably maintain now.
Abstract: Users of the Web are overloaded with information. This medium is “polluted” with redundant, erroneous and low quality information. A WWW survey of 11,700 users conducted from April 10 to May 10, 1996[1] indicates that 30.31% of the users report “finding known info” is their problem and 27.80% of the users report organizing collected information as their problem. An empirical study[2] on users’ revisitation patterns to WWW pages found that 58% of an individual’s pages are revisits. With these study results, we believe the Web users would like to build and organize a larger collection of bookmarks for future references than they can reasonably maintain now.

130 citations


Authors

Showing all 33297 results

NameH-indexPapersCitations
Pulickel M. Ajayan1761223136241
Xiaodong Wang1351573117552
S. Shankar Sastry12285886155
Sumio Iijima106633101834
Thomas W. Ebbesen9930570789
Kishor S. Trivedi9569836816
Sharad Malik9561537258
Shigeo Ohno9130328104
Adrian Perrig8937453367
Jan M. Rabaey8152536523
C. Lee Giles8053625636
Edward A. Lee7846234620
Otto Zhou7432218968
Katsumi Kaneko7458128619
Guido Groeseneken73107426977
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20238
202220
2021234
2020518
2019952
20181,088