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시스템-온-칩을 위한 12비트 1MSps 연속 근사형 아날로그-디지털 변환기 설계
최성규(Seong-Kyu Choi),성명우(Myeong-U Seong),김성우(Sung-Woo Kim),류지열(Jee-Youl Ryu) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.5
This paper proposes a 12-bit 1MSps SAR ADC(Successive Approximation Register Analog-to-Digital Converter) for SoC(System-on-Chip). The proposed circuit is designed using Magnachip/SK Hynix 0.18㎛ CMOS 1Poly-6Metal process, and it is powered by 1.8 supply. To reduce chip area and power dissipation, we minimized unit capacitor area and number of the total capacitors, and designed the circuit considering optimization as compared to conventional circuits. The proposed circuit in this paper showed high SNDR(Signal-to-Noise Distortion Ratio) of 70.03dB, and excellent effective bit number of 11.34-bit as compared to conventional research results. The designed circuit also showed low power dissipation of 5.5mW, and small chip area of 0.56mm2. The proposed ADC is applicable for the signal conversion of the industry system application.
갑상선 유두암 환자에서 경부 림프절 재발에 대한 최소 갑상선외 침습의 임상적 중요성
황성배(Seong-Bae Hwang),류우상(Woo-Sang Ryu),서우형(U-Hyoung Seo),이재복(Jea-Bok Lee),배정원(Jung-Won Bae),구범환(Bum-Hwan Koo) 대한외과학회 2007 Annals of Surgical Treatment and Research(ASRT) Vol.73 No.5
Purpose: Extra-thyroidal extension has been recognized as a poor prognostic factor for increased regional recurrence risk in papillary thyroid carcinoma, and is known to require treatment that is more aggressive. In the recent UICC TNM 6th Classification, an extra-thyroidal extension was divided into a minimal extra-thyroidal extension (T3) and a massive extra-thyroidal extension (T4). The aim of this study was to investigate the clinical effect of a minimal extra-thyroidal extension of a papillary carcinoma for the recurrence of regional cervical lymph nodes. Methods: We retrospectively studied 154 patients with papillary thyroid carcinoma where a thyroidectomy was performed from Feb. 2003 to May. 2006 at the Department of Surgery, with the exclusion of 6 patients with a massive extra-thyroidal extension. We divided the cases into a no extra-thyroidal extension group and a minimal extra-thyroidal extension group according to the grading of the extra-thyroidal extension. The grading of the extra-thyroidal extension was based on both pathological findings and intraoperative surgical findings. Clinicopathological factors associated with each group were analyzed by univariate and multivariate analysis. We divided the cases into two groups according to age (<45 yrs, ≥45 yrs) and lymph node status (positive, negative), and compared each group with regards to disease free survival according to the grading of the extra-thyroidal extension. Results: By univariate analysis, a minimal extra-thyroidal extension was related to lymph node metastasis, tumor size, mutifocality (P<0.05), and was not related to cervical lymph node recurrence statistically (P=0.108). Cervical lymph node recurrence was related to being male, lymph node metastasis and tumor size (P<0.05). By multivariate analysis, a minimal extra-thyroidal extension was independently related to tumor size, multifocality, and lymph node metastasis (P<0.05). In both groups with regards to age and lymph node status, a minimal extra-thyroidal extension was not statistically related to disease free survival (P>0.05). Conclusion: We need to downstage to less than T3 for a minimal extra-thyroidal extension because there is no significant difference in disease free survival according to the grading of an extra-thyroidal extension in patients with papillary thyroid carcinoma.
저면적 12비트 1MSps 연속 근사형 레지스터 아날로그-디지털 변환기 설계
성명우(Myeong-U Seong),이정훈(Jung-Hoon Lee),류지열(Jee-Youl Ryu) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.2
This paper proposes a low area 12-bit 1MSps SAR ADC(Successive Approximation Register Analog-to-Digital Converter). The proposed circuit is designed using Magnachip/SK Hynix 1-Poly 6-Metal 0.18-μm CMOS process, and it is powered by a 1.8-V supply. Total chip area is reduced by replacing the MIM capacitors with MOS capacitors instead of the capacitors consisting of overall part in chip area. We designed optimized circuit as compared to conventional circuits by reducing the unit capacitors and number of the total capacitors to reduce power dissipation. The proposed circuit in this paper showed improved power dissipation of 1.93mW, and chip area of 0.51mm² as compared to conventional research results at the input frequency of 100kHz and power supply of 1.8V. The designed circuit also showed high SNDR(Signal-to-Noise Distortion Ratio) of 70.51dB, and excellent effective number of bits of 11.4bits.
성명우(Myeong-U Seong),류지열(Jee-Youl Ryu) 한국정보기술학회 2018 한국정보기술학회논문지 Vol.16 No.1
This paper presents high-precision low-cost digital portable hardness tester using the Leeb rebound hardness test method. The Leeb rebound test method is generally easier to measure, and more accurate than other types of hardness testing methods. This method is used on all metals, except in condition where the test metal structure or surface conditions would introduce too much variations. This portable method is also used for testing efficiently hardness of surface and unreachable edges of large metal workpiece(mainly above 1kg). The proposed hardness tester consists of sensor probes(impact devices) of 7-type to measure Leeb rebound and embedded system unit for its control and signal processing. This hardness tester showed resolution of more than 20%, measurement accuracy of more than 25%, cost effective of 33% and response time of 15msec for the various test samples as compared to conventional hardness tester. We believe that this tester is widely used in the metal industries to measure hardness.