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Author: Yoshihiro Ohno

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1. Experimental study of the visual adaptation field in mesopic photometry: Does surrounding luminance affect peripheral adaptation?
Published: 9/6/2013
Authors: Tatsukiyo Uchida, Yoshihiro Ohno
Abstract: CIE 191:2010 recommends a mesopic photometry system that defines the luminous efficiency function for peripheral visual tasks, which vary depending on adaptation state of observers. For implementation of the system, an adaptation field to determine t ...

2. Report on the Key Comparison CCPR K2.a-2003
Published: 10/30/2009
Authors: Yoshihiro Ohno, Steven W Brown, Thomas C Larason
Abstract: Under the framework of Mutual Recognition Arrangement (MRA) for national measurements standards and for calibration and measurement certificates issued by National Metrology Institutes (NMIs) signed in 1999, an international comparison of spectral re ...

3. Extension of the NIST tristimulus colorimeter for solid-state light source measurements
Published: 5/29/2009
Authors: George P Eppeldauer, Carl C Miller, Thomas C Larason, Yoshihiro Ohno
Abstract: In order to obtain improved color measurement uncertainties for solid state light (SSL) sources, the second generation tristimulus colorimeter of NIST has been extended with a fifth channel to perform efficient matrix corrections for the spectral mis ...

4. Illuminance responsivity calibration of reference photometers at the NIST SIRCUS and SCF facilities
Published: 5/29/2009
Authors: George P Eppeldauer, Carl C Miller, Thomas C Larason, Yoshihiro Ohno
Abstract: The illuminance responsivities of two transfer standard photometers have been directly determined from their spectral responsivity calibrations at two different calibration facilities of NIST. The main characteristics of the two photometers, and thei ...

Published: 5/29/2009
Authors: Carl C Miller, Yoshihiro Ohno, Wendy L Davis, Yuqin Zong, Kevin Dowling
Abstract: The National Institute of Standards and Technology has developed a spectrally tunable lighting facility to allow state-of-the-art vision experiments on color rendering and lighting. The facility is composed of two cubicles, each lit by a spectrally ...

6. Standardization Activities for Solid State Lighting in the USA
Published: 5/29/2009
Author: Yoshihiro Ohno
Abstract: In support of the U.S. Department Energy s Energy Star program for solid state lighting, a series of standards for solid state lighting products have been developed in the USA. The standards published related to measurement and color include ANSI-NEM ...

7. Illumination with enhanced contrast as a visualization tool for clinical diagnostics and surgery
Published: 2/26/2009
Authors: Maritoni Abatayo Litorja, Steven W Brown, Yoshihiro Ohno, Chungsan Lin
Abstract: The requirements for diagnostic and surgical lighting have remained largely unchanged over the past several years illumination level, glare, shadow and tissue heating reduction are the dominant factors in choosing a lighting system. Since human visu ...

Published: 7/14/2008
Authors: Yuqin Zong, Yoshihiro Ohno, Pei-ting Chou
Abstract: Alternating-current (AC) driven high-power LEDs are available and used in SSL products. AC LEDs operate directly from a mains supply and thus have advantages in simplifying product design, increasing product reliability, and extending product lifetim ...

Published: 7/11/2008
Authors: Yuqin Zong, Yoshihiro Ohno
Abstract: The measurement of high-power light emitting diodes (LEDs) has been difficult because they are highly sensitive to thermal operating conditions, and there has been a lack of common methods that can be used by both LED manufactures and users to acquir ...

10. Color Quality and Spectra
Published: 7/1/2008
Authors: Yoshihiro Ohno, Wendy L Davis
Abstract: Color quality, including white light chromaticity and color rendering performance, as well as luminous efficacy of radiation, for illumination sources are introduced. Spectral design considerations for white LED and solid-state lighting products to ...

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