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Yu, Wonsik,Kim, Jaewook,Kim, KwangSeok,Cho, SeongHwan IEEE 2013 IEEE transactions on circuits and systems. a publi Vol.60 No.4
<P>In this paper, a time-domain high-order <TEX>$\Delta\Sigma$</TEX> analog-to-digital converter (ADC) using voltage-controlled gated-ring oscillator (VC-GRO) and time-domain multi-stage-noise-shaping (MASH) is introduced. To implement the high-order noise transfer function (NTF), a voltage-controlled oscillator (VCO) and VC-GRO quantizers are cascaded. Unlike conventional high-order <TEX>$\Delta\Sigma$</TEX> ADC using feedback loop, the proposed ADC has advantages that the architecture is open-loop and the quantizer resolution depends on the time resolution, thus making it attractive for deep submicron CMOS process. The performance of the proposed ADC is theoretically analyzed and simulated, including non-ideal conditions such as nonlinearity, mismatch, propagation delay of logic gates, phase noise, and sampling clock jitter.</P>
Wonsik Yu,KwangSeok Kim,SeongHwan Cho IEEE 2015 IEEE journal of solid-state circuits Vol.50 No.5
<P>In this paper, a fourth-order ΔΣ time-to-digital converter (TDC) is proposed to achieve high resolution and wide signal bandwidth. The proposed TDC is based on a 1-3 multi-stage-noise-shaping (MASH) architecture, where the first-stage is a gated-ring oscillator based TDC (GRO-TDC) and the second-stage is a single-loop third-order ΔΣ TDC based on a time-domain error-feedback filter using time registers, time adders and time amplifiers. Implemented in 65 nm CMOS process, the prototype TDC achieves 0.22 ps<SUB>rms</SUB> of integrated noise within 15 MHz signal bandwidth at 300 MS/s while consuming lower than 6.24 mW. The proposed TDC occupies an active die area of only 0.03 mm<SUP>2</SUP>.</P>
Wonsik Yu,KwangSeok Kim,SeongHwan Cho IEEE 2014 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS PART 1 R Vol.61 No.8
<P>This paper presents a second-order ΔΣ time-to-digital converter (TDC) by using a switched-ring oscillator (SRO) and a gated switched-ring oscillator (GSRO). Unlike conventional multi-stage noise-shaping (MASH) TDC using SROs, the proposed TDC does not require complex calibration to compensate for the error from frequency difference between the oscillators. Furthermore, the performance of the proposed TDC is analyzed, including non-idealities such as phase noise, mismatch, and PVT variations. The prototype 1-1 MASH TDC achieves 148 f s<SUB>rms</SUB> integrated noise in 4 MHz signal bandwidth at 400 MS/s while consuming 6.55 mW in a 65 nm CMOS process.</P>
Yu, Jae Ik,Kim, Ji-Hoon,Nam, Ki-El,Lee, Wonsik,Rhee, Dong-Kwon The Korean Society for Microbiology and Biotechnol 2022 Journal of microbiology and biotechnology Vol.32 No.6
Allergic rhinitis (AR), one of the most common inflammatory diseases, is caused by immunoglobulin E (IgE)-mediated reactions against inhaled allergens. AR involves mucosal inflammation driven by type 2 helper T (Th2) cells. Previously, it was shown that the Streptococcus pneumoniae pep27 mutant (Δpep27) could prevent and treat allergic asthma by reducing Th2 responses. However, the underlying mechanism of Δpep27 immunization in AR remains undetermined. Here, we investigated the role of Δpep27 immunization in the development and progression of AR and elucidated potential mechanisms. In an ovalbumin (OVA)-induced AR mice model, Δpep27 alleviated allergic symptoms (frequency of sneezing and rubbing) and reduced TLR2 and TLR4 expression, Th2 cytokines, and eosinophil infiltration in the nasal mucosa. Mechanistically, Δpep27 reduced the activation of the NLRP3 inflammasome in the nasal mucosa by down-regulating the Toll-like receptor signaling pathway. In conclusion, Δpep27 seems to alleviate TLR signaling and NLRP3 inflammasome activation to subsequently prevent AR.
김원식(Wonsik KIM),권오유(O-Yu KWON),이창용(Changyong LEE),신웅기(Woongghi SHIN),김수일(Sooil KIM) 대한체질인류학회 1996 대한체질인류학회지 Vol.9 No.2
간추림: 본 영구표본은 충남 서산군 해미에서 출토된 1860년대 유골로서, 불포화 polyester 수지 (TC-141, 애경화학) 를 촉매제 (methyl ethyl ketone peroxide), 촉진제(cobalt octoate), 자외선흡수제 (Tinuvine-320, Ciba Geigy 사)를 적절히 혼합하여 제작하였다. 이번 사용한 방법은, 1976년 본 교실에서 불포화 polyester 수지를 이용하여 인체횡단표본을 제작했던 방법을 근거로 하였으나, 수지가 매우 정제되어 골격속으로의 침투가 더욱 충실해졌으며, 연색을 방지하기위한 자외선흡수제를 사용한 점 표본제작을 쉽게 하기 위해 이형제를 사용한 점 등은 한단계 발전된 방법이라 하겠다. 이렇게 제작된 표본들은 본래의 외관과 색깔을 지니고 있고, 자외선 흡수제가 혼입되어 있어 황변의 속도가 매우 느려 장기간 본래의 모습대로 보존될 수 있으며 갱도가 높아 파손될 우려가 거의 없는 점 등이 그 목적에 매우 부합한다고 하겠다.
KwangSeok Kim,WonSik Yu,SeongHwan Cho IEEE 2014 IEEE journal of solid-state circuits Vol.49 No.4
<P>In this paper, a 2.5 b/stage pipelined time-to-digital converter (TDC) is presented. For pipelined operation, a novel time-register is proposed which is capable of storing, adding and subtracting time information with a clock signal. Together with a pulse-train time-amplifier, a 9-bit synchronous pipelined TDC is implemented, which consists of three 2.5 b/stage TDCs and a 3 b delay-line TDC. A prototype chip fabricated in 65 nm CMOS process achieves 1.12 ps of time resolution at 250 MS/s while consuming 15.4 mW. Compared to other high-resolution state-of-the-art TDCs, the proposed pipelined TDC achieves the best figure-of-merit (FoM) without any calibration.</P>
Jaewook Kim,Wonsik Yu,SeongHwan Cho IEEE 2012 IEEE transactions on microwave theory and techniqu Vol.60 No.10
<P>In this paper, we present a 0.2-1.8-GHz digital-intensive receiver front-end using a voltage-controlled oscillator (VCO)-based analog-to-digital converter (ADC) running at 1.4 Gs/s in 90-nm CMOS. To improve the out-of-band rejection, we propose a second-order anti-aliasing Sinc filter that can be embedded in the ADC, which exploits the integrating nature of a VCO. the nonideal effect of the proposed architecture is analyzed with regard to the waveform imperfection due to device mismatch. The proposed receiver achieves -94 dBm of sensitivity at 1-MHz bandwidth and - 6.8 dBm of IIP3, while providing 50-dB rejection of aliased signals.</P>
Kim, Yeon Joo,Kim, Jong Hoon,Yu, Chang Sik,Kim, Tae Won,Jang, Se Jin,Choi, Eun Kyung,Kim, Jin Cheon,Choi, Wonsik The Korean Society for Radiation Oncology 2017 Radiation Oncology Journal Vol.35 No.2
Purpose: The concentration of capecitabine peaks at 1-2 hours after administration. We therefore assumed that proper timing of capecitabine administration and radiotherapy would maximize radiosensitization and influence survival among patients with locally advanced rectal cancer. Materials and Methods: We retrospectively reviewed 223 patients with locally advanced rectal cancer who underwent preoperative chemoradiation, followed by surgery from January 2002 to May 2006. All patients underwent pelvic radiotherapy (50 Gy/25 fractions) and received capecitabine twice daily at 12-hour intervals ($1,650mg/m^2/day$). Patients were divided into two groups according to the time interval between capecitabine intake and radiotherapy. Patients who took capecitabine 1 hour before radiotherapy were classified as Group A (n = 109); all others were classified as Group B (n = 114). Results: The median follow-up period was 72 months (range, 7 to 149 months). Although Group A had a significantly higher rate of good responses (44% vs. 25%; p = 0.005), the 5-year local recurrence-free survival rates of 93% in Group A and 97% in Group B did not differ significantly (p = 0.519). The 5-year disease-free survival and overall survival rates were also comparable between the groups. Conclusions: Despite the better pathological response in Group A, the time interval between capecitabine and radiotherapy administration did not have a significant effect on survivals. Further evaluations are needed to clarify the interaction of these treatment modalities.