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RISS 인기검색어
- 검색키워드
- 저자 : Josefa Angelie Revilla (검색결과 2 건)
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Exploratory Study on the Impacts of Handle Vibration on the Hand and Forearm
Josefa Angelie Revilla,Ping Yeap Loh,Satoshi Muraki 대한산업공학회 2019 Industrial Engineeering & Management Systems Vol.18 No.4
This study investigated the immediate impacts of short-term handle vibration on hand functions, upper limb discomfort, and forearm muscle responses during hand grip test and task performance of seven healthy young adults. Thetask was to grip the handlebar for 5 minutes with 50% perceived strength under two conditions: with handle vibration(HV) and without handle vibration (NHV). Activities of forearm muscles namely flexor carpi radialis (FCR), flexor ofthe fingers (FF), flexor carpi ulnaris (FCU), and extensor digitorum (ED) were recorded using surface electromyography (EMG), while post-task hand tests for finger dexterity, strength, and sensibility were also measured. These fingerfunctions as well as muscle responses did not differ significantly between HV and NHV. The lacking effects might beassociated to the inconsistencies on grip force during task, perhaps participants let go of the handle during the latterpart. Meanwhile, perceived discomfort on the shoulder was significantly higher after HV than NHV and activity ofFCR, FF, and ED during maximal grip test were significantly different (p < 0.05) as well. Specifically, muscle activities were lower by 12-15% after HV than NHV, indicating that HV might have influenced the ability to grip hardly. Inconclusion, maximal grip test and discomfort rating can be a predictive parameter to determine the instantaneous effects of handle vibration.
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Angelica Louise P. San Juan,Josefa Angelie D. Revilla,Angelo C. Ani,Clarissa M. Pesigan,Alan Marco S. Mercado 대한산업공학회 2022 Industrial Engineeering & Management Systems Vol.21 No.4
The use of computers, especially for school-works or office-related activities, has been vital in recent years. Nowa-days, in the Philippines, English and Tagalog languages are alternately used for formal writing, while Taglish is often used for informal writing. Either means of type-written communication is highly dependent on the use of computer keyboards. The most used keyboard layout today is the QWERTY layout, which based on previous studies, was not designed ergonomically. Hence, this study aims to develop ergonomic keyboard layouts that are more fit than the QWERTY layout, in terms of utilizing finger strength and encouraging finger and hand alternation, for typing in Eng-lish, Tagalog, and Taglish. The keyboard layouts were developed with the use of Python programming language. The layouts were developed considering factors such as finger strength, finger alternation, and hand alternation and were evaluated using the Text Analysis (TA) points computed based on the previously-mentioned factors and the distance travelled by each finger. Of the 12 proposed layouts, layouts 2 and 4 ease hand movement when typing English, Ta-galog, and Taglish words as compared to the QWERTY keyboard layout.
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