AKASHI Yukio

FacultyArchitecture and Civil Engineering
Teacher OrganizationArchitecture and Civil Engineering
Education and
 Research Organization
Faculty of Engineering /Graduate School of Engineering
PositionProfessor
Last Updated: 19/07/22 10:26

Researcher Profile & Settings

Name

    AKASHI Yukio

Affiliation

  •  Architecture and Civil Engineering Professor

Academic & Professional Experience

  • Jan. 2012University of Fukui Professor
  • Jun. 2007University of Fukui Associate Professor
  • Jan. 1999Jun. 2007Rensselaer Polytechnic Institute Lighting Research Center
  • Apr. 1985Nov. 1998Matsushita Electric Industrial Co., Ltd. Senior Researcher

Association Memberships

    Illuminating Engineering Institute of Japan trustee,Illuminating Engineering Society of North America member,Architectural Institute of Japan member,

Research Activities

Published Papers

  • AGEING EFFECTS ON DISCOMFORT GLARE SENSATION AND THEIR MECHANISMS
    Akashi, Y., Kojima, S., Aoki, T., Inatani, M.
    PROCEEDINGS of the Conference on Smart Lighting for Better Life at the CIE Midterm Meeting 2017 (20171006) 1(1) 94-99 Nov.  2017 Refereed
  • The Effect of High-luminous-flux Luminaires on Target Detection, Glare Sensation, and Perceived Safety and Security in Streets
    L. Xingqi, T. Fujita, Y. Akashi
    Journal of Science and Technology in Lighting 41 120-128 Dec.  2017 Refereed
  • Veiling Luminance Caused by a Peripheral Glare Source on Extra-Foveal Vision
    N. Terai, K. Iwamoto, Y. Akashi
    Journal of Science and Technology in Lighting 41 129-139 Dec.  2017 Refereed
  • Lighting requirements for adaptive driving beam to improve target visibility
    Terai, N, Akashi, Y, Shibata, Y, Ishida, H
     1(1) 65-65 Mar.  2018 Not refereed
  • Senescent changes in readability of letters with various sizes, luminance contrasts, and background luminances
    K. Murakami, Y. Akashi, Y. Kuno, M. Inatani, T. Aoki
    Proceedings of the 8th Lux Pacifica 1(1) 84-87 Mar.  2018 Refereed
  • A field experiment to identify spectral power distributions of lamps appropriate for raodway lighting
    K Onishi, Y Akashi, M Yamada, N Takei, T Suzuki
    Journal of The Illuminating Engineering Institute of Japan 101(6) 243-246 Jun.  2017 Refereed
  • A MODIFICATION OF THE MESOPIC LUMINANCE EQUATION IN THE CIE MESOPIC PHOTOMETRY SYSTEM FOR A BETTER REPRESENTATION OF THE MESOPIC VISION IN THE WHOLE VISUAL FIELD
    MORIMOTO Kyota;NIE Dong xing;AKASHI Yukio
    Journal of Environmental Engineering (Transactions of AIJ) 82(732) 113-119 Feb.  2017 Refereed
     The CIE mesopic photometry system (CIE, 2010) was based on target detection performances at an eccentricity angle of 10 degrees. It has not been confirmed whether the MES2 system can be applied to other eccentricity angles in the peripheral visual field. To verify the validity of the CIE mesopic photometry system and modify the system if necessary, this study conducted a target detection experiment by employing six subjects. This experiment measured the subjects' reaction times for targets presented at eccentricity angles of 5, 10, 15, and 25 degrees from the center of the visual field. This experiment used light levels between 0.005 cd/m2 and 2 cd/m2 and two lamp spectral power distributions of yellow LED (S/P ratio=0.10) and white LED (S/P ratio = 1.86). Based on the results of the experiment, this study found that the visual field within 5 degrees from the center of the visual field can be treated as the central visual field where only cones function even under mesopic light levels. The CIE mesopic photometry showed good correlations between mesopic luminances and reaction times for the two SPD conditions at eccentricity angles of 10 and 15 degrees. However, the luminance borderline between the photopic vision and the mesopic vision at the eccentricity angle of 25 degrees seemed to be higher than 5 cd/m2, which the CIE MES2 defined.
     Therefore, this study attempted to modify the mesopic luminance formula only for the eccentricity angle of 25 degrees.
  • Influence of veiling luminance caused by a peripheral glare sournce on extra-foveal vision
    N Terai, K Iwamoto, Y Akashi
    Proceedings of The 15th International Symposium on the Science and Technology of Lighting (LS15) 25-28 May  2016 Refereed
  • The effect of disability glare caused by high luminance street luminaires on oncoming pedestrian detections
    X Liu, T Fujita, Y Akashi, K Yamamoto
    Proceedings of The 15th International Symposium on the Science and Technology of Lighting (LS15) Session 1.1 363-366 May  2016 Refereed
  • Adaptation luminance simulation for CIE mesopic photometry system implementation
    T Uchida, M Ayama, Y Akashi, N Hara, T kitano, Y Kodaira, K Sakai
    Lighting Research and Technology 48(1) 14-25 Feb.  2016 Refereed
  • EFFECTIVENESS OF TASK AND AMBIENT LIGHTING SYSTEM USING INDIRECT LUMINAIRES
    YAMAMOTO Kana;AKASHI Yukio
    Journal of Environmental Engineering (Transactions of AIJ) 81(727) 765-773 Sep.  2016 Refereed
     General lighting has been widely used for office rooms in Japan. However, to reduce energy consumption it is important to use task and ambient lighting (TAL) systems in office rooms. It is known that TAL systems can minimize electric energy consumption without compromising lighting quality in office rooms To make TAL systems be used more widely in office rooms, it is important to take any measures to improve lighting quality, especially perceived room brightness in office rooms which employ TAL systems.
     We conducted two experiments in a real office room and 1/10-scale office model rooms. In the real office experiment, we employed a proposed TAL system that adopts suspended indirect luminaires as ambient lighting. This is because we hypothesized that the proposed TAL system could reduce gloomy non-lit areas by the indirect ambient lighting and therefore increase perceived room brightness. We measured the energy consumption of the office room and evaluated the quality of the working environment by using questionnaires. From the results, we found that the proposed TAL system with indirect ambient lighting helped reduce deep shadows and discomfort glare, and therefore improved its lighting quality. In addition, the TAL system with indirect ambient lighting reduced lighting energy by about 40% from conventional general lighting.
     In the additional laboratory experiment using 1/10-scale models, we compared the lighting quality of the TAL system using indirect ambient lighting with a TAL system using direct ambient lighting, a TAL system with dimmed ambient lighting, and a general lighting system. In this experiment, we confirmed the results of the real size field experiment and found the lighting quality of the TAL with indirect ambient lighting to be better than the other lighting systems.
     However, this study found the brightness uniformity of the TAL with indirect ambient lighting to be worse than the general lighting and TAL with direct ambient lighting systems. On the other hand, physical indexes such as luminance uniformity (minimum luminance over average luminance) and luminance variation coefficient (luminance standard variation over average luminance) showed better performances for the TAL system with indirect ambient lighting than for the other lighting systems. This implies that luminance modulations within a certain special frequency range may influence perceived brightness uniformity and therefore perceived room brightness. Further research is needed to investigate the mechanisms of how people evaluate uniformity of luminance distributions in lit office rooms.
  • THE EFFECT OF GLARE FROM WINDOWS ON VISUAL PERFORMANCE FOR VERTICAL VDT TASKS
    KATO Yoko;AKASHI Yukio;SUGANO Susumu
    Journal of Environmental Engineering (Transactions of AIJ) 81(727) 757-764 Sep.  2016 Refereed
     In order to reduce global warming while maintaining occupants' health it is important to make the best use of daylight in interior spaces. To maintain comfortable interior environments while utilizing daylight it is necessary to control window luminance appropriately. To this end, many researchers have referred to discomfort glare from high-luminance windows. However, since recent office workers often perform visual tasks by using computer displays their visual performances are susceptible to high-luminance windows. Ocular light scatter covers the entire visual field of a worker, and therefore often reduces the luminance contrast of a target against its background.
     The purpose of this study was to investigate how a high-luminance side window impairs visual performance of a computer task. Subjects were asked to detect targets presented at the central and peripheral visual field, and the subjects' response times were measured. In order to investigate the mechanisms of how window luminance affects target detections, veiling luminance on each target caused by the window was calculated under each of the experimental conditions. The findings of the study are listed below.
     1) The high-luminance window behind the computer display significantly impaired the detection performance of targets presented on the computer display. As the luminance of the window increased, the visual performance was decreased. The validity of the experimental dataset was confirmed by comparing the dataset with existing experimental data.
     2) When window luminance exceeded a certain luminance between 3000 cd/m2 and 6000 cd/m2, visual performance was deteriorated significantly. This implies that window luminance should be reduced to lower than 3000 cd/m2 for computer tasks.
     3) Evaluations of discomfort glare did not necessarily correspond to visual performance. Therefore, in order to design windows for efficient task environments it is important to minimize the effects of windows on discomfort glare and visual performance.
  • Akashi Laboratory, Department of Architecture and Civil Engineering, Faculty of Engineering, University of Fukui(General Introduction of Research Laboratories)
    Akashi Yukio; Oku Yoshiki
    Journal of the Illuminating Engineering Institute of Japan 99(7) Jul.  2015 Not refereed
  • Let's Keep and Refine the Light on Our Tradition for the Bright Future! - Hokuriku Branch(Foreword)
    Akashi Yukio
    Journal of the Illuminating Engineering Institute of Japan 99(7) 331-332 Jul.  2015 Not refereed
  • A PRACTICAL TOOL TO EVALUATE MESOPIC LUMINANCE DISTRIBUTIONS FOR NIGHT-TIME ROADWAYS BASED ON THE CIE MESOPIC PHOTOMETRY
    Yukio Akashi, Morimoto Kyota
    Proceedings of 28th CIE Session 2015 1(2) 1036-1042 Jun.  2015 Refereed
  • HOW MUCH MORE ILLUMINANCE IS NEEDED FOR OLDER PEOPLE THAN YOUNG PEOPLE TO PERFORM PHOTOPIC TASKS?
    Kenta Yamamoto, Yukio Akashi
    Proceedings of 28th CIE Session 1(2) 1043-1049 Jun.  2015 Refereed
  • LED street lighting improving visual performance and scene brightness through mesopic photometry
    Y Akashi, K Morimoto
    Proceedings of The 14th International Symposium on the Science and Technology of Lighting (LS14) 6c(6c) 327-328 Jun.  2014 Not refereed
  • Interference between Foveal and Peripheral Visual Tasks, Potentially Affecting Mesopic Photometry
    Akashi Yukio;Kanaya Sueko;Ishikura Chieko
    Journal of Light & Visual Environment 38 79-88 2014 Refereed
    Commission Intemationale de l'Eclairage (CIE) published CIE 191: Recommended System for Mesopic Photometry Based on Visual Performance was published in 2010. However, it is still necessary to identify appropriate applications and make guidelines for the new mesopic photometry system. To this end, we dealt with interference between the foveal task and the peripheral task that often exists in the real driving context. Such interference often appears to exaggerate the effectiveness of short-wavelength radiation on peripheral visual performance at mesopic light levels. To address a question of how the foveal vision affects the peripheral vision for different spectral power distributions, but for the same mesopic luminance, we conducted a controlled laboratory experiment and two supplemental laboratory experiments. In these experiments, we asked subjects to perform a foveal tracking task and a peripheral target-detection task, simulating nighttime multi-tasking driving activities in mesopic light levels. Based on the results of the experiments we confirmed the Purkinje phenomena. We also found interference between the foveal task and the peripheral task (especially when the foveal task was difficult). Such interference not only impairs the foveal task performance but also reduces the peripheral responses significantly, and potentially makes the Purkinje phenomena appear to be exaggerated. This confirmed the importance of using light sources with more short-wavelength radiation for better peripheral visibility in nighttime roadway lighting applications. Such interference also suggests that the use of a simple easy task may help eliminate any effect of interference on databases to establish a unified mesopic photometry system.
  • Future lighting
    Journal of Japan Association of Lighting Engineers and Designers(1) 20-23 Jan.  2013 Not refereed
  • LED luminaire simulating Japanese candles
    Journal of Hokuriku Economy Research(408) 50-51 Jan.  2013 Not refereed
  • Impact of power saving measures on office lighting in 2011
    J. Environ. Eng., AIJ 78(683) 42263 Jan.  2013 Refereed
  • What is CIE's Recommended System for Mesopic Photometry?(Efficient and Safe Lighting Based on the Spectral Sensitivity of Human Vision at Mesopic Light Levels)
    Akashi Yukio
    Journal of the Illuminating Engineering Institute of Japan 97(4) 209-212 Apr.  2013 Not refereed
    This article introduces the CIE191:2010 Recommended System for Mesopic Photometry Based on Visual Performance. This article will lead readers to understand how to calculate a mesopic luminance by using two variables, i.e., an s/p ratio and an adaptation luminance, what kinds of experimental data CIE191 was based on, and what problems CIE191 has to be solved before being applied to practical lighting applications.
  • THE IMPACT OF POWER-SAVING MEASURES ON OFFICE LIGHTING IN 2011:The current status of lighting conditions in office environments under power-saving policies enacted in the aftermath of the Great East Japan Earthquake?Part 1
    MOCHIZUKI Etsuko;YOSHIZAWA Nozomu;IWATA Toshie;MUNAKATA Jun;HIRATE Kotarou;AKASHI Yukio
    J. Environ. Eng. 78(683) 9-16 2013 Refereed
    The purpose of this study is to reconsider the optimal lighting conditions in office buildings with respect to both the occupants' visual comfort and reduced energy use. This paper reports on how the lighting in office buildings in Japan changed after the events that followed the Great East Japan Earthquake in March 2011. For the first step, a survey of facility managers in office buildings was conducted nationwide. The survey focused on specific measures taken to reduce power consumption. Additionally, the occupants of each office building filled out a questionnaire about the lighting conditions in their working areas.
    The results showed that for about half or more buildings, saving measures for lighting and air-conditioning during the summer months were taken. With regards to lighting, the number of illuminated lamps was reduced (partial lighting) and ceiling luminaires were turned off automatically at a preset time in order to avoid forgetting to turn them off when unnecessary, such as lunch-time or at the end of working hours. It could be supposed that the desktop illuminance of the most of the office buildings shifted from 750-1000 lx to 300-500 lx due to electricity-saving measures.
  • Task and ambient lighting guide 3
    Journal of Illuminating Engineering Institute of Japan 96(12) 787-789 Dec.  2012 Not refereed
  • Effect of target positions on Purkinje effect
    Journal of Illuminating Engineering Institute of Japan 96(11) 752-760 Nov.  2012 Refereed
  • Task and ambient lighting guide 1
    Journal of Illuminating Engineering Institute of Japan 96(9) 621-622 Sep.  2012 Not refereed
  • Task and ambient lighting guide 2
    Journal of Illuminating Engineering Institute of Japan 96(10) 691-692 Sep.  2012 Not refereed
  • Towards implementation of task and ambient lighting
    Journal of Illuminating Engineering Institute of Japan 96(8B) 493-496 Aug.  2012 Not refereed
  • Effect of spectral power distribution on the perception of scene brightness in nighttime lit streets
    Journal of Illuminating Engineering Institute of Japan 96(5) 259-271 May  2012 Refereed
  • Effect of yellowing human crystalline lens on mesopic visual performance
    Journal of Illuminating Engineering Institute of Japan 96(5) 298-302 May  2012 Refereed
  • 40191 Energy saving and power saving of office lighting
    Honma Mutsuo;Nakamura Yoshiki;Akashi Yukio;Nakao Risa
    Summaries of technical papers of annual meeting 2012 409-412 Sep.  2012 Refereed
  • The Effect of Spectral Power Distribution on the Perception of Scene Brightness in Nighttime Lit Streets
    SHIRAKURA Kimitaka;AKASHI Yukio;SAITO Takashi
    Journal of The Illuminating Engineering Institute of Japan 96(5) 259-271 May  2012 Refereed
  • The Effect of Yellowing Human Crystalline Lens on Mesopic Visual Performance
    AKASHI Yukio;NAKAGAWA Keiko
    Journal of The Illuminating Engineering Institute of Japan 96(5) 298-302 May  2012 Refereed
  • Effects of Target Positions on Purkinje Effect
    NAKAGAWA Keiko;AKASHI Yukio;ARIMATSU Takayuki;KYOTO Nobuhiro
    Journal of The Illuminating Engineering Institute of Japan 96(11) 752-760 Nov.  2012 Refereed
  • Towards Implementation of Task and Ambient Lighting
    Journal of the Illuminating Engineering Institute of Japan 96(8) 493-496 Aug.  2012 Not refereed
  • 40184 Task and ambient lighting appropriate for the elderly
    Akashi Yukio
    Summaries of technical papers of annual meeting 2012 393-394 Sep.  2012 Not refereed
  • 40190 Field survey on light environment in office buildings due to the effects of the Great East Japan Earthquake
    MOCHIZUKI Etsuko
    Summaries of technical papers of annual meeting 2012 405-408 Sep.  2012 Refereed
  • Several views of metal halide and high-pressure sodium lighting for outdoor applications
    M. S. Rea, J. D. Bullough, Y. Akashi
     41(4) 297-320 Dec.  2009 Refereed
  • The Effect of Yellowing Human Crystalline Lens on the Mesopic Vision
    Keiko Nakagawa, Yukio Akashi
     May  2009
  • Spectral characteristics and efficiency of lamps - with a teaching aid, a simplified spectrometer
    JELMA Journal 507 35-39 Jan.  2009 Not refereed
  • Visual mechanisms and implementations of sparkle
    Y. Akashi
     26(2) 283-284 Jun.  2007 Refereed
  • Response of night-migrating songbirds in cloud to colored and flashing light
    W. R. Evans, Y. Akashi, N. S. Altman, A. M. Manville II
     60(1) 476-488 Jun.  2007 Refereed
  • Driver decision making in response o peripheral moving targets under mesopic light levels
    Y. Akashi, M. S. Rea, J. D. Bullough
     39(1) 53-67 Jan.  2007 Refereed
  • Temporal Aspects of Lighting: A Study on detection and acceptance
    W. R. Evans, Y. Akashi, N. S. Altman, A. M. Manville II
     31(1) 18-23 Jan.  2007 Refereed
  • Identifying sparkle
    Y. Akashi, Mike A. Myer, Peter R. Boyce
     38(4) 325-340 Dec.  2006 Refereed
  • Impact of surrounding illumination on visual fatigue and eyestrain while viewing television
    Y. Akashi, Peter R. Boyce
     6(8) 1664-1670 Aug.  2006 Refereed
  • A field study of illuminance reduction
    John D. Bullough, Y. Akashi, Charles R. Fay
     38(6) 588-599 Jun.  2006 Refereed
  • Potential recommendations of illuminance reduction for load shedding
    Y. Akashi, Jason Neches
     37(2) 133-153 May  2005 Refereed

Books etc

  • CIE 227: 2017. LIGHTING FOR OLDER PEOPLE AND PEOPLE WITH VISUAL IMPAIRMENT IN BUILDINGS.
    VIENNA: COMMISSION INTERNATIONALE DE L’ECLAIRAGE. Sep.  2017
    978-3-901906-96-1
  • Life design for the eartch
    Hikaru Kobayashi, Kanako Toyosada, Yukio Akashi, and other 30 authors
     May  2016
    978-4-86324-099-5
  • Assessment of Headlamp Glare and Potential Countermeasures: The Effects of Headlamp Mounting Height (DOT HS 810 947)
    Yukio Akashi, ohn Van Derlofske, Ramesh Raghavan, John D. Bullough
    U.S. Department of Transportation Jan.  2008
  • Investigation of Safety-Based Advanced Forward-Lighting Concepts to Reduce Glare (DOT HS 811 033)
    John D. Bullough, Nicholas P. Skinner, Yukio Akashi, John Van Derlofske
    U.S. Department of Transportation Jun.  2008
  • Sensitivity Analysis of Headlamp Parameters Affecting Visibility and Glare (DOT HS 811 055)
    Yukio Akashi, Fey Hu, John D. Bullough, John Van Derlofske
    U.S. Department of Transportation Jun.  2008

Conference Activities & Talks

  • Study of required ADB illuminance condition with multiple opponent cars in night-time driving.
    Hiroo Maeda, Tooru Miyazaki, Yukio Akashi, Yuichi Shibata, Hiroyuki Ishida
    2018年度照明学会第51回全国大会 Sep.  2018
  • Readability evaluation based on individual contrast sensitivity for older subjects.
    Yuta Kuno, Yukio Akashi, Kaori Murakami.
     Sep.  2018
  • Influence of spectral characteristics of LED on visibility of visual target.
    Aika Mori, Yukio Akashi, Emi Kaga, Shota Shimonishi
    2018年度照明学会第51回全国大会 Sep.  2018
  • Off-axis target detections and on-axis target recognitions in a mesopic light level.
    Ryoya Ohashi, Yukio Akashi, Tatsukiyo Uchid
    2018年度照明学会第51回全国大会 Sep.  2018
  • Difference in bright and dark adaptation between elderly and young people during night-time driving.
    Hiroki Futatsuya, Nie Dongxing, Yukio Akashi
     Sep.  2018
  • Lighting for older people
    Yukio Akashi
    Asia Lighting Conference 2018 Sep.  2018
  • AGEING EFFECTS ON DISCOMFORT GLARE SENSATION AND THEIR MECHANISMS
    Yukio Akashi, Sayuri Kojima, Tomoe Aoki, Masaru Inatani
    CIE 2018 Topical Conference on Smart Lighting Mar.  2018
  • How much light is needed for older people?
    Yukio Akashi, Kenta Yamamoto
    International conferenc on sustainable lighting and loght pollution 2014 Nov.  2014
  • タスク・アンビエント照明による作業環境の質の向上
    Kana Yamamoto, Yukio Akashi
     Sep.  2014
  • Study of required ADB illuminance condition in night-time driving.
    Norifumi Terai, Yukio Akashi, Yuichi Shibata, Hiroyuki Ishida
    The 50th Annual Conference, The Illuminating Engineering Institute of Japan Sep.  2017
  • The color rendering and S/P ratio in light source affects brightness and visibility of street space with mesopic level. Hiroki Futatsuya, Yukio Akashi, Toshihiro Tsumori
    Hiroki Futatsuya, Yukio Akashi, Toshihiro Tsumori
    The 50th Annual Conference, The Illuminating Engineering Institute of Japan Sep.  2017
  • The effect of local lighting by using projection mapping on brightness perception
    Kazane Kobayashi, Yukio Akashi
    The 50th Annual Conference, The Illuminating Engineering Institute of Japan Sep.  2017
  • Energy savings by installing skylights in a large-scale single-story store Shogo Yasuda, Yukio Akash
    Shogo Yasuda, Yukio Akashi
    The 50th Annual Conference, The Illuminating Engineering Institute of Japan Sep.  2017
  • Evaluation of luminance distribution of office ceiling
    K Murakami, K Yamamoto, Y Akashi
    The 49th Annual Conference, The Illuminating Engineering Institute of Japan Aug.  2016
  • The effect of wall color and illuminance on the scene brightness in a cafe
    K Kobayashi, S Ikeda, Y Akashi
    The 49th Annual Conference, The Illuminating Engineering Institute of JApan Aug.  2016
  • Effectiveness of a natural white light source with an increased S/P ratio for roadway lighting.
    Kenta Onishi, Yukio Akashi, Makoto Yamada, Naoko Takei, Toru Suzuki
    The 49 th Annual Conference, The Illuminating Engineering Institute of Japan Aug.  2016
  • An availability of LED street lighting for power outage on disasters. (Part2)
    Toshiaki Noda, Toshinari Matsui, Toshiyuki Morishima, Toshitaka Noriki, Nobuyoshi Inatomi, Teruhisa Ito, Mitsuo Enoki, Natsumi Watanabe, Hiroshi Ito, Yukio Akashi, Kyoichi Himura, Tadashi Doi
    The 49th Annual Conference, The Illuminating Engineering Institute of Japan Aug.  2016
  • An availability of LED street lighting for power outage on disasters. (Part1)
    Toshinari Matsui, Toshiyuki Morishima, Toshitaka Noriki, Nobuyoshi Inatomi, Toshiaki Noda, Teruhisa Ito, Mitsuo Enoki, Natsumi Watanabe, Hiroshi Ito, Yukio Akashi, Kyoichi Himura, Tadashi Doi
    The 49th Annual Conference of The Illuminating Engineering Institute of Japan Aug.  2016
  • Veiling luminance in peripheral visual field caused by an off-axis glare source
    K Iwamoto, N Terai, Y Akashi
    The 49th Annual Conference of The Illuminating Engineering Institute of Japan Aug.  2016
  • Potential visual aids for pedestrians by using projection mapping technology.
    Karakida Tetsu、Akashi Yukio
     Aug.  2015
  • How much more illuminance is needed for older people than young people to perform photopic tasks?
    Kenta Yamamoto, Yukio Akashi
     Aug.  2015
  • Veiling luminance caused by an off-axis glare source on the peripheral visual field.
    Iwamoto Kazushi、Akashi Yukio
     Aug.  2015
  • Campus Illumination in conjunction with luminaire developments
    Y Akashi
    Annual Conference, Illuminating Engineering Institute of Japan Aug.  2015
  • LEDを用いた起床前光照射による目覚めの改善
    藤田紗織, 巻口彰史, 明石 行生, 安藤信二, 山田浩, 井上慎介, 久保千穂
     Sep.  2013
  • 薄明視市環境における視野内の順応状態が視作業性に及ぼす影響
    森本喬太, 田中紘一, 明石 行生
     Sep.  2013
  • 中心視の作業負荷がプルキンエ現象に及ぼす影響
    飯干真也, 北川暉, 明石 行生
     Sep.  2013
  • Lighting for the elderly and people with visual impairment
    明石 行生
    Center for Sustainable Healthy Building Jun.  2013
  • LEDからの不快グレアの視覚的機構モデルの提案
    Marina Nakano, Yukio Akashi
    The Illuminating Engineering Institute of Japan Sep.  2012
  • 起床前の光照射による目覚めの促進
    Marina Nakano, Yukio Akashi, Akihumi Makiguchi, Shinnji Ando, 山田浩, 久保千穂
    The Illuminating Engineering Institute of Japan Sep.  2012
  • 光刺激制御が生体リズムに及ぼす影響
    Ayumi Nakajima, Yukio Akashi, Hiroshi Abe
    The Illuminating Engineering Institute of Japan Sep.  2012
  • LEDの分光分布が薄明視下での視作業に及ぼす影響
    Masaya Iihoshi, Yukio Akashi, 岡本堅介, 唐澤宜典, 斎藤孝
    The Illuminating Engineering Institute of Japan Sep.  2012
  • タスクライトのあり方における設計実務上の考察
    中尾理沙, 本間睦朗, Yukio Akashi
    The Illuminating Engineering Institute of Japan Sep.  2012
  • Lighting for the elderly and visually impaired
    Yukio Akashi
    2012 Taiwan Solid State Lighting Jun.  2012
  • A Global Perspective: CIE TC3-44 Committee Findings & Recommendations
    Yukio Akashi
    Illuminating Engineering Society of North America Mar.  2012
  • Development of a lighting fixture mimicking Japanese traditional candels by using LEDs
    Koichi Tanaka, Yukio Akashi
    The Illuminating Engineering Institute of Japan Sep.  2011
  • Toward a model of discomfort glare from LEDs
    Shohei Asano, Takashi Fujita, Yukio Akashi
    The Illuminating Engineering Institute of Japan Sep.  2011
  • The effects of a peripheral glare source on off-axis visual performance of the elderly
    Marina Nakano, Miki Kawabata, Yukio Akashi, Susumu Sugano
    The Illuminating Engineering Institute of Japan Sep.  2011
  • The effect of spectral power distribution on the perception of scene brightness in nighttime lit streets
    Yukio Akashi, Kimitaka Shirakura, Takashi Saito
    The Illuminating Engineering Institute of Japan Sep.  2011
  • Towards a model of discomfort glare caused by LEDs
    Yukio Akashi
    Architectural Institute of Japan Aug.  2011
  • Implementing mesopic photometry in nighttime lit streets
    Yukio Akashi, Keiko Nakagawa
    For better comprehension to mesopic vision and its photometry Mar.  2011
  • Study on blue light to increase office worker's alertness
    Kyoko Hiwatashi, Yukio Akashi, Hiroki Noguchi
    The Illuminating Engineering Institute of Japan Sep.  2010
  • A survey on sleep time and depression of students in Fukui
    Sachi Yamada, Yukio Akashi, Hiroshi Abe, 高橋 さえり
    The Illuminating Engineering Institute of Japan Sep.  2010
  • Development of circadian sensor for biological clock
    高橋 さえり, Yukio Akashi, Sachi Yamada, Hiroshi Abe
    The Illuminating Engineering Institute of Japan Sep.  2010
  • The effectiveness of white light sources at mesopic light levels
    Keiko Nakagawa, Yukio Akashi, Takayuki Arimatsu, Nobuhiro Kyoto
    The Illuminating Engineering Institute of Japan Sep.  2010
  • Objective evaluation of the effect of glare on visual performance
    Yoko Kato, Yukio Akashi, Susumu Sugano
    The Illuminating Engineering Institute of Japan Sep.  2010
  • The effect of light source luminance in the visual field on task illumiance selection
    Marina Nakano, Yukio Akashi, Susumu Sugano
    The Illuminating Engineering Institute of Japan Sep.  2010
  • The effect of lamp spectral distributions and lamp spacing on discomfort glare sensation
    Kazuto Imai, Takakazu Murakami, Yukio Akashi
    The Illuminating Engineering Institute of Japan Sep.  2010
  • The effect of sexurity lighting with different spectral power distributions on the perception of spacial brightness
    Kimitaka Shirakura, Yukio Akashi, Takashi Saito, Takayoshi Matsui
    The Illuminating Engineering Institute of Japan Sep.  2010
  • The effect of increasing luminous flux of security lighting on target visibility
    Takashi Fujita, Yukio Akashi, Takashi Saito, Takayoshi Matsui
    The Illuminating Engineering Institute of Japan Sep.  2010
  • The effect of yellowing human crystalline lens on mesoic vision
    Yukio Akashi, Keiko Nakagawa, Shouichi Asahi
    Color Forum Japan 2009 Nov.  2009
  • Measuring fluctuation of Japanese candle and consideration
    Shouichi Asahi, Yukio Akashi
    The Illuminating Engineering Institute of Japan Aug.  2009
  • Advantages and disadvantages of blue street lighting
    Yukio Akashi, Saeri Takahashi
    The Illuminating Engineering Institute of Japan Aug.  2009
  • The effect of early morning exposure to blue light on alertness and circadian rhythm
    Sachi Yamada, Yukio Akashi, Hiroshi Abe, Hiroki Noguchi
    The Illuminating Engineering Institute of Japan Aug.  2009
  • Body temperature and melatonin supression under different spectral power distribution conditions
    Chiaki Shimizu, Yukio Akashi, Hiroshi Abe, Hiroki Noguchi
    The Illuminating Engineering Institute of Japan Aug.  2009
  • The effect of yellowing human crystalline lens on visual performance at mesoic light levels
    Keiko Nakagawa, Yukio Akashi
    The Illuminating Engineering Institute of Japan Aug.  2009
  • The perception of brightness under mesopic vision
    Kimitaka Shirakura, Yukio Akashi
    The Illuminating Engineering Institute of Japan Aug.  2009
  • The effect of accent lighting on retail sales
    Ryu Kuwayama, Yukio Akashi
    The Illuminating Engineering Institute of Japan Aug.  2008
  • Illumination of public stairways for elderly people
    Yoshiki Nakamura, Yukio Akashi, Sueko Kanaya, Norihiro Ikeda, Genji Yamamoto, Chiho Kubo
    The Illuminating Engineering Institute of Japan Aug.  2008
  • Facial recognition under blue lighting
    Saeri Takahashi, Yukio Akashi
    The Illuminating Engineering Institute of Japan Aug.  2008
  • The effect of white LED's spectral power distributions on the perception of brightness
    Yukio Akashi, Shouichi Asahi
    The Illuminating Engineering Institute of Japan Aug.  2008
  • Evaluation of a street under blue and white lighting
    Saeri Takahashi, Yukio Akashi
    Architectural Institute of Japan Aug.  2008

Works

  • LED luminaire simulating a Japanese traditional candle
     Mar. 2011
  • spectrometer
     Jan. 2009
  • Lighting of Pentagon Memorial
     Sep. 2008

Awards & Honors

  •  Faculty of Engineering University of Fukui The Teacher of the Year 2013Jan. 2014
  •  Faculty of Engineering University of Fukui The Teacher of the Year 2012Jan. 2013
  •  Faculty of Engineering University of Fukui The Teacher of the Year 2011Jan. 2012
  •  Faculty of Engineering University of Fukui The Teacher of the YearJan. 2009