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Hoshina Takunari,Fujiyama Daiki,Koike Takuji,Ikeda Katsuhisa 대한청각학회 2022 Journal of Audiology & Otology Vol.26 No.3
Background and Objectives: The harmful effects of frequent exposure to loud sounds through portable music players (PMPs) in combination with earphones have been suggested to result in a high prevalence of recreational noise-induced hearing loss among children, adolescents, and young adults. The present study aimed to evaluate the effects of an active noise control technology applied to earphones on the preferred listening levels (PLLs) while listening to music in the presence of background noise. Subjects and Methods: Twenty-three adults between 20 and 40 years with normal hearing were recruited for this study. PLLs for listening to pop-rock and classical music were measured in the participants’ ear canal with a commercially available PMP for four earphone/headphone configurations in quiet and noisy conditions. Ear canal insertion loss was measured in open ear conditions as well as earphone/headphone conditions. Results: The average PLL while using earphones and headphones exceeded 85 dBA corresponding to the sound level to induce hearing damage, but in the case of canal earphones with noise cancelling (NC), it was below 75 dBA, corresponding to potentially harmful levels. The background subway noise significantly increased the PLL measured in quiet conditions using any four earphone/headphone types except canal earphones with NC. Canal earphones with NC showed the lowest PLLs compared with participants’ average PLLs using the other three earphone/headphone types. Conclusions: To minimize recreational noise exposure at the risk of PMP use, the use of earphones with NC is recommended in noisy environments.
Korean species of the Genus Scaphobaeocera Csiki (Coleoptera: Staphylinidae: Scaphidiinae) in Korea
Hideto HOSHINA,박선재,안기정 한국곤충학회 2009 Entomological Research Vol.39 No.5
The genus Scaphobaeocera Csiki including three species (S. dorsalis Löbl, S. inexpectata Löbl, S. pecki Löbl) is identified for the first time in Korea. A key to the species is given with diagnosis and illustrations of important morphological features.
Taxonomy of the tribe Cephenniini Reitter (Coleoptera: Scydmaenidae) in Korea
박선재,Hideto HOSHINA,안기정 한국곤충학회 2006 Entomological Research Vol.36 No.2
A taxonomic study of the tribe Cephenniini Reitter in Korea is presented. Two genera and two species - Cephennodes japonicus (Sharp) and Chelonoidum graeseri (Reitter) - are recognized. The genus and species Cephennodes japonicus is recorded for the first time in Korea. A key, descriptions and illustrations of diagnostic characters of known Korean Cephenniini species are given.
박선재,Hideto HOSHINA,안기정 한국곤충학회 2004 Entomological Research Vol.34 No.3
A taxonomic study of the subgenus Agathidium of the genus Agathidium Panzer inKorea is presented. Four species [Agathidium (Agathidium) coreanum Angelini, A. (A.) crassicornePortevin, A. (A.) merkli Angelini, and A. (A.) oblongum Angelini] are recognized. Agathidium (A.)mequignoni Roubal recorded by Angelini is misidentification of A. (A.) crassicorne Portevin.Spermatheca of A. (A.) merkli is illustrated for the first time. A key to the species, diagnoses andillustrations of diagnostic characters are provided.
DC/DC Converter Development for Battery Energy Storage Supporting Railway DC Feeder System
Z. Li,S. Hoshina,N. Satake,M. Nogi 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
The paper introduces development works of a bilateral DC/DC converter rated at 1500V with peak power 500kW for battery energy storage systems supporting railway DC feeder systems. The DC/DC converter converts the regenerated power from the breaking train and to charge the batteries. The DC/DC converter discharges the stored energy to feed the powering train. The paper describes the converter main circuit, the control system and successful test results at the factory. For the main circuit test, a special test method is applied. For the control system test, a real time digital simulator is used for hardware-in-loop test. In addition to the converter tests, results from the DC feeder system tests with an actual rectifier and a battery bank are also introduced.
Park, Sun-Jae,Hoshina, Hideto,Han, Kee-Jeong Korean Society of Applied Entomology 2003 INSECTA KOREANA Vol.20 No.1
A taxonomic study of two agathidiine genera and species in Korea is presented. The genera and two species [Cyrtoplastus seriepunctatus (Brisout, 1867) and Liodopria maculicollis Nakane, 1963] are reported for the first time in Korea. Descriptions and illustrations of diagnostic characters of these species, and key to the genera of the Agathidiini are provided.