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나 영왕,백 형진,최 유미,이 석영,이 정로,정 종욱,박 용진,김 석현 한국작물학회 2014 한국작물학회지 Vol.59 No.3
The purpose of this study was to develop the cost-effective and efficiency seed longevity prediction method of rice (Oryza sativa L.) germplasm for viability monitoring. To find an optimum predicting method for rice seed longevity at genebank, an accelerated ageing (AA) test, a controlled deterioration (CD) test and a dry-heat treatment (DHT) were conducted to the four groups of rice germplasm based on ecotype, such as Indica, Japonica, Javanica and Tongil type. Among the three artificial aging treatments, the dry-heat treatment of 36 hours at 90°C is suggested as a routine predictive test method of rice germplasm longevity at a genebank. The distribution of germination rate on 3,066 accessions which conserved 26.5 years at 4°C showed similar trend with the result of distribution by dry-heat treatment at 90°C on 36 hours using 106 accessions of rice selected samples which composed four ecotype groups. The results show that the dry-heat treatment affect not only predicting the rice seed longevity but also determining effective interval for monitoring germination of rice germplasm in genebanks.
0.18 μm CMOS 공정으로 설계된 아날로그-디지털 변환기를 내장한 Wireless 온도 센서 설계
파함 듀이 동,트란 난,이 종욱 경희-다반 ASIC 설계교육센터 2006 경희-다반 ASIC센터 논문집 Vol.7 No.-
A simple and practical architecture for RF-powered wireless temperature sensor is presented. The tag chip receives its power supply from a RF-DC converter which recovers DC power from a small incident signal. Ambient temperature is estimated by a temperature-voltage converter, and a single-slope ADC converts the temperature-dependent voltage to digital data. This approach does not depend on the temperature dependence of oscillator frequency, thus, does not require complex post processing such as laser trimming in the practical implementation of the temperature sensor. With on chip ADC, this proposed temperature sensor has a sensitivity of 6744 ppm/oC. We investigated the operation of the wireless, remotely-power sensor tag chip using standard 0.18 pm CMOS technology.
0.35 μm CMOS 공정으로 제작된 UHF 대역 RFID 태그 칩 통신 제어부 설계
트란 난,파함 듀이 동,이 종욱 경희-다반 ASIC 설계교육센터 2006 경희-다반 ASIC센터 논문집 Vol.7 No.-
We present the control circuit for reader to tag communication in UHF band RFID tag chip. The system clock of tag chip is generated by the internal oscillator with digital calibration to maintain stable clock signal. The control circuit designed using standard 0.35 pm CMOS process shows the correct operation of analog front-end of RFID tag chip. Together with verifying the combination of circuits of the analog front end, we present the design considerations of the comparator with internal hysteresis and the internal oscillator with calibration.