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RISS 인기검색어
- 검색키워드
- 저자 : ( Hsiao-ching Yuan ) (검색결과 3 건)
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Electrode layout of ZnO pyroelectric sensors
Chun-Ching Hsiao,Shih-Yuan Yu 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.11
In the present study, an electrode layout of pyroelectric sensors is developed to improve electric signals. Voltage responsivity is a main target to enhance the performance of pyroelectric sensors. A partially covered, top electrode has been proven to effectively increase the voltage responsivity of pyroelectric sensors. In the experimental results, the proposed electrode layout with an array type in ZnO pyroelectric sensors possessed higher voltage signals, about 3.6 times that of a fully covered type, and about 2 times that of a partially covered type. Moreover, a finite element model is used to explore the temperature variation rate in ZnO pyroelectric sensors for both the fully covered and the partially covered electrodes. In the simulation results, the partially covered electrode can indeed improve the temperature variation rate in the ZnO layer.
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Language Reduced Redundancy Tests: A Reexamination of Cloze Test and C-test
( Wen-ying Lin ),( Hsiao-ching Yuan ),( Ho-ping Feng ) 범태평양 응용언어학회 2008 범태평양응용언어학회지 Vol.12 No.1
The purposes of this study are: (1) to investigate whether cloze forms with textdriven deletion method, proposed by Farhady and Keramati (1996), will produce better psychometric properties than standard cloze form; (2) to compare the psychometric properties of cloze test and C-test, both of which belong to the family of language reduced redundancy test; (3) to examine whether different deletion rates lead to difference in test-takers’ performances; and (4) to test whether the assumption of test-takers’ performance invariance across different texts hold for both cloze test and C-test. Based on two authentic texts with different rhetoric modes, three cloze forms with text-driven deletion method, along with one standard cloze and one form of C-test, were constructed and randomly administered to 237 student subjects at one private university in northern Taiwan. Furthermore, each subject was required to take three subtests (from a sample TOEFL test) as criterion measures for empirical validity. The results of the study indicated that neither the three cloze forms nor the C-test was substantially superior to the standard cloze in terms of reliability and validity. In addition, the findings of the study were inconclusive with regard to whether different deletion rates result in different test-takers’ performances. Finally, no strong evidence was found to substantiate the claim that both cloze test and C-test meet the assumption of test-takers’ performance invariance across different texts.
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