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Yun-Rae Jo,Seong-Kwan Hong,Oh-Kyong Kwon IEEE 2014 IEEE transactions on nuclear science Vol.61 No.5
<P>This paper proposes a CMOS flat-panel X-ray detector (FPXD) with dual-gain active pixel sensors (APSs) and column-parallel readout circuits to reduce the random noise. The proposed dual-gain APS employs the conversion gain control in a pixel sensor array and supports both high and low sensitivity modes for FPXD. The in-pixel conversion gain control suppresses the amplification of the pixel noise, so it improves signal-to-noise characteristics. The column-parallel readout circuits include single-slope analog-to-digital converters (SS-ADCs) and charge-summing circuits for pixel binning and analog double delta sampling (DDS). SS-ADCs support 12-bit resolution and use the driving method of gray-code counters with different initial values to reduce the peak current and the power fluctuation. They also employ a high resolution continuous-type ramp generator to reduce the area. The proposed CMOS FPXD with a pixel size of 100 μm × 100 μm was fabricated using a 0.18-μm CMOS process. The conversion gains in high and low sensitivity modes are designed with 0.43 μV/e<SUP>-</SUP> and 3.00 μV/e<SUP>-</SUP>, respectively. The measured random noises in high and low sensitivity modes are 366 μV and 400 μV, respectively, at the resolution of 12 bits and the frame rate of 30 fps. The area of ramp generator and the peak current of the gray-code counter are reduced by 92% and 43%, respectively, compared with the conventional structures.</P>
Yun-Rae Jo,Seong-Kwan Hong,Oh-Kyong Kwon Institute of Electrical and Electronics Engineers 2016 IEEE transactions on electron devices Vol.63 No.1
<P>This paper proposes a multibit pulsewidth modulated (PWM) delta-sigma (Delta Sigma) analog-to-digital converter (ADC) using a single-slope (SS) quantizer for a CMOS image sensor (CIS). In the proposed ADC, the multibit Delta Sigma modulation is performed by converting the pulsewidth of the PWM signal into multibit data using an SS quantizer. This suppresses the random noise by the multisampling operation and reduces the area of the multibit Delta Sigma ADC by adding a ramp signal to a single-bit Delta Sigma ADC. The proposed ADC with 12-b resolution was fabricated using a 0.13-mu m CIS process with a pixel array which has a Bayer patterned color filter and an image format of 580 x 450 with a pixel size of 5 mu m x 5 mu m. The size of the test chip is 4 mm x 5 mm, including the area of the proposed channel ADC, which occupies only 10 mu m x 400 mu m per channel. The measured results show a random noise of 65 mu V and a dynamic range of 70.4 dB.</P>
Jo, Yun-Rae,Hong, Seong-Kwan,Kwon, Oh-Kyong Institute of Electrical and Electronics Engineers 2017 IEEE transactions on electron devices Vol.64 No.1
<P>This paper presents a low-power and lownoise tileable CMOS X-ray line detector with time-delay-integration (TDI) for large-sized dental X-ray imaging systems. The proposed X-ray line detector with TDI adopts pseudomultisampling (PMS) using shifted clocks for the single-slope analog-to-digital converter (ADC) to reduce the required clock cycles for the ADC. The reduced clock cycle decreases the dynamic power and power fluctuation to ensure power stability for large-sized X-ray detectors. The TDI X-ray line detector with PMS was fabricated using 0.18-mu m CMOS image sensor process technology with a stitching process, which has an image format of 1010 x 86 and a pixel size of 75 mu m x 75 mu m. The X-ray line detectors are tiled with 1 x 2 and 1 x 3 arrays to enlarge the active areas for dentalpanoramic and cephalometric X-ray imaging systems, respectively. The measurement results show the random noise of 0.43 LSB and a dynamic range of 78.5 dB, when the number of TDI stages is 86 and the number of PMS steps is 4. The dynamic current and power consumption per ADC are reduced from 157.4 mu A and 283.32 mu W to 41.2 mu A and 74.16 mu W, respectively, when PMS is adopted for TDI.</P>
조윤래(Yun Rae Jo) 공주대학교 동양학연구소 1998 초자연현상연구 Vol.5 No.-
Wuxing has been spread all over the world by Zon Van at the middle age of Chongook(戰國). Since then, combined with Yinyang(陰陽), Wuxing has been one of the essential ideas of Oriental philosophy. Originally the motivation on which Zou Van urged Wuxing was designed for an unification of the divided nations out of the long-termed conflict in special situation of Chongook. Wuxing includes both a supplementary aspect and a predominant aspect. Zou Yan prefered a predominant one which prophesied the presentation of heavenly prince. Wuxing has been developed diversely, absorbed into the other theories of various schools with time. It has been prevailed into all the Oriental ideas, such as cosmology and the idea of prophets, and came to form an essential structure of Oriental culture. Wuxing has been contradicted as a code of conduct for savages by the intelligentsia of the age of 5.4 New Cultural Movement. Wuxing has maintained its original contents for a long time because of its practicality which is out of actual living experiences.
Assessment of Soil Compaction Related to the Bulk Density with Land use Types on Arable Land
Hee-Rae Cho,Kang-Ho Jung,Yong-Seon Zhang,Kyung-Hwa Han,Ahn-Sung Roh,Kwang-Rae Cho,Soo-Jeong Lim,Seung-Chul Choi,Jin-il Lee,Yeo-Uk Yun,Byoung-Gu Ahn,Byeong-Ho Kim,Jun-Hong Park,Chan-Yong Kim,Sang-Jo Pa 한국토양비료학회 2013 한국토양비료학회지 Vol.46 No.5
Soil compaction is affected by soil texture, organic matter (OM), strength (ST) and soil moisture, which is difficult to understand the degree and effects of related factors. The purpose of the study is to assess the impact of them on the compaction with bulk density (BD). The analysis was conducted with data collected from national-wide monitoring sites including 105 upland soils, 246 orchard soils, and 408 paddy soils between 2009 and 2012. The distributions of soil physical properties were measured. The correlation and multi linear regression analysis were performed between soil physical properties using SAS. The regression equation of BD(y) includes ST, gravitational water contents (GWC), and OM as variables commonly, having additional factors, clay content and sand content in paddy soil and upland soil for only subsoil (p<0.001). Our results show that the BD could be explained about 40~50% by various physical properties. The regression was mainly determined by ST in orchard and upland soil and by the GWC in paddy soil. To mitigate soil compaction, it is important to maintain the proper level of OM in upland soil and to consider the moisture condition with soil texture in paddy soil when making work plan. Furthermore, it would be recommended the management criteria classified by soil texture for the paddy soils.
도축장의 소와 돼지 분변에서 분리한 살모넬라속의 약제내성 및 약제내성 유전자의 보유율
하도윤 ( Do Yun Hah ),지대해 ( Dae Hae Ji ),조상래 ( Sang Rae Jo ),박애라 ( Ae Ra Park ),정은희 ( Eun Hee Jung ),박동엽 ( Dong Yeop Park ),이국천 ( Kuk Cheon Lee ),양정웅 ( Jung Wung Yang ),김종수 ( Jong Shu Kim ),김혜정 ( Hye Jun 한국동물위생학회 2011 한국동물위생학회지 (KOJVS) Vol.34 No.1
This study was conducted to investigate the distribution of Salmonella spp. from pigs and cattle in slaughterhouse, the antimicrobial resistance pattern and the prevalence of resistance genes of isolates. A total of 640 fecal samples from pigs and cattle in slaughterhouse were collected for isolation of Salmonella spp.. Isolation rate was revealed as 15% in pigs and 1.6% in cattle. As result of serotyping, group B (56.6%) were identified as most common in pigs and cattle isolates, in order of group C (24.5%) and group E (15.1%). S. Typhimurium (50.9%) was most common serotype. The major serotypes were in order of S. Rissen and S. London (11.3%) and S. Riggil (7.6%). In antimicrobial test, all isolates were demonstrates susceptibility to nitrofurantoin. But isolates were revealed resistance other antibiotics in order of tetracycline (64.6%), streptomycin (68.3%), ampicillin and amoxicillin (56.3%) and spectinomycin (47.9%). With polymerase chain reaction, antimicrobial resistance gene strA (75.0%) and aadA1 (3.1%) were detected in streptomycin resistance isolates and tetA (94.3%) and tetB (11.3%) gene were detected in tetracycline resistant isolates, but tetG was not detected. Class 1 integron gene was detected in all Salmonella isolates.