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JournalISSN: 1942-9533

Electronics and Communications in Japan 

Wiley
About: Electronics and Communications in Japan is an academic journal published by Wiley. The journal publishes majorly in the area(s): Laser & Optical fiber. It has an ISSN identifier of 1942-9533. Over the lifetime, 1350 publications have been published receiving 3952 citations. The journal is also known as: Electronics & communications in Japan & Denki Gakkai ronbunshi.


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Journal ArticleDOI
TL;DR: In this paper, a low threading dislocation density (TDD) AlN crystal was developed for DUV-LEDs for use in sterilization applications, achieving an external quantum efficiency of about 4% and an output power greater than 30 mW.
Abstract: SUMMARY Deep-ultraviolet (DUV) light-emitting diodes (LEDs) are in demand for a wide variety of potential applications, such as sterilization, water and air purification, medical uses, and so on. We have demonstrated 222–351 nm AlGaN and quaternary InAlGaN-based DUV-LEDs by developing a low threading dislocation density (TDD) AlN crystal. We achieved an external quantum efficiency (EQE) of about 4% and an output power greater than 30 mW in DUV-LEDs for use in sterilization applications by developing new crystal growth techniques.

122 citations

Journal ArticleDOI
TL;DR: In this article, the authors proposed an improved image measurement method for crack width determination, intended for application to real concrete structures. But, these methods have concentrated only on the application to test specimens.
Abstract: Crack width is an important data item in inspection and diagnosis for the safety management of concrete structures. Usually the crack width measurement is performed manually by specialists using a crack scale. However, it takes a long time and lacks the objectivity needed for quantitative analysis. Therefore, the importance of image processing for visual inspection has been increasing in civil and construction engineering. Recently, many methods for crack width measurement have been proposed. We have already tried to measure crack width utilizing image processing. However, these methods have concentrated only on the application to test specimens. In this paper, we propose an improved image measurement method for crack width determination, intended for application to real concrete structures. In our method, a crack scale is applied to the concrete surface for image acquisition. The crack width is measured by the brightness of the crack scale areas on the image with sub-pixel order accuracy. In the real world, the lighting conditions differ in various environments. To deal with such differences, this paper clarifies the conditions of effectiveness of our method for practical use. The validity of the proposed technique is investigated by experiments with images of a real concrete surface. © 2009 Wiley Periodicals, Inc. Electron Comm Jpn, 92(10): 1–12, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecj.10151

46 citations

Journal ArticleDOI
TL;DR: A person’s brain activity when he or she sees an emoticon at the end of a sentence is described and the experimental results show that the right and left inferior frontal gyrus were activated and a sentence with an emoticons as the verbal and nonverbal information.
Abstract: SUMMARY In this paper, we describe a person’s brain activity when he or she sees an emoticon at the end of a sentence. An emoticon consists of some characters that resemble the human face and expresses the sender’s emotions. With the help of a computer network, we use e-mail, messaging, avatars, and so on, in order to communicate with a recipient. Moreover, we send an emotional expression by using an emoticon at the end of a sentence. In this research, we investigate the effect of an emoticon as nonverbal information, using an fMRI study. The experimental results show that the right and left inferior frontal gyrus were activated and we detect a sentence with an emoticon as the verbal and nonverbal information. © 2011 Wiley Periodicals, Inc. Electron Comm Jpn, 94(5): 17–24, 2011; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/ecj.10311

45 citations

Performance
Metrics
No. of papers from the Journal in previous years
YearPapers
202315
202243
202151
202050
201983
201898