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박희석(Park Hee Suk),박찬원(Park Chan Won) 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.1
In this paper, we study the river level/velocimetry measuring system using the ultrasonic sensor to acquire the more Precise data From the river circumstance in rainy season. We design the two ultrasonic sensor system to calculate the wather level and surface current speed of the river using the dedicated hardware and software. We investigate the validity and effectiveness of the proposed system which applied to the real river environment monotoring system that will be extended to the GIS.
충남.경남지역 대학생들의 영어모음 발음길이에 대한 실험적 연구
박희석,김정숙,Park, Hee-Suk,Kim, Jung-Sook 한국음성학회 2003 음성과학 Vol.10 No.3
The purpose of this experimental study is to investigate and compare the. vowel lengths of English diphthongs and low vowels among native-English-speaking Americans with Korean college students from the Chungnam and Gyungnam provinces. Eight words and sixteen sentences were uttered five times by twenty five subjects from three groups; 1) Chungnam dialect speakers, 2) Gyungnam dialect speakers and 3) five native-English-speaking Americans. Acoustic features (duration) were measured from sound spectrograms made by the PC Quire. Results showed that the vowel lengths of English diphthongs and low vowels between native English speakers and Korean collegians of Chungnam and Gyungnam provinces were different. Comparing the average length of English diphthongs of Korean collegians with those of American natives, we can see that native English speakers tend to pronounce the English diphthongs shorter than Korean collegians do. However, native English speakers tend to pronounce the English low vowels longer than Korean collegians do. In this study we also tried to find out the differences of English diphthongs and low vowel lengths in relation to their utterance positions among American natives and Chungnam and Gyungnam dialect speakers. By the results of this experiment, we observed a lengthening effect in the three groups. However, in the pronunciation of American natives, a lengthening effect of English vowels was more clearly observed, especially in the pronunciation of English diphthongs.
Benzothiazole고리가 있는 6-엑소메칠렌 펜남 유도체의 합성
임채욱(Cha Euk Im),박희석(Hee Suk Park),김승재(Seung Jae Kim),임철부(Chul Bu Yim) 대한약학회 2002 약학회지 Vol.46 No.5
The synthesis of new 6-exomethylene penams with benzothiazole ring was described. The 6,6-dibromopenam 5 was treated with CH 3MgBr and carbaldehyde 4 to afford the 6-bromo-6-(1-hydroxy-1-methyl)penicillanate 6, which was reacted with acetic anhydride to give acetoxy compound 7. The deacetobromination of acetoxy compound 7 with zinc and acetic acid gave 6-exomethylene penams,Z-isomer 8 and E-isomer 9, which was oxidized to suuones 10 by m-CPBA. The p-methoxybenzyl compounds 6~10 were deprotected by AlC13 and neutralized to give the sodium salts 11~15.