This paper introduces a voltage-mode DC-DC buck converter designed to address the challenges of high-frequency operation. The proposed comparator-less Reactive Ramp Generator (RRG) topology mitigates issues associated with comparator delays, achieving fast load transient response. By eliminating all comparators from converter’s control circuit, we prevent potential delay-induced malfunctions, thereby enhancing overall operational reliability. rapid response RRG, enabled by short feedback...

Abstract In this paper, we introduce pressure-driven flow-induced miniaturizing free-flow electrophoresis (PDF-induced μ-FFE), a novel continuous separation method. our system, the external flow and electric field are applied to particles, such that particle movement is affected by flow, electroosmosis electrophoresis. We then analyzed hydrodynamic drag force electrophoretic particles in opposite directions. Based on analysis, micro- nano-sized were separated according their mobilities with...

An all-glass bifurcation microfluidic chip for blood plasma separation was fabricated by a cost-effective glass molding process using an amorphous carbon (AC) mold, which in turn the carbonization of replicated furan precursor. To compensate shrinkage during AC mold fabrication, enlarged photoresist pattern master designed, and with dimensional error 2.9% achieved; 1.6%. In process, microchannel plate negligible shape errors (~1.5%) compared to replicated. Finally, realized micro drilling...

This study reports a cost-effective method of replicating glass microfluidic chips using vitreous carbon (VC) stamp. A replica with the required microstructures was synthesized without etching. The replication uses VC stamp fabricated by combining thermal furan-based, thermally-curable polymer carbonization. To test feasibility this method, flow focusing droplet generator flow-focusing and channel widths 50 µm 100 µm, respectively, successfully in soda-lime substrate. Deviation between...

This brief presents a reconfigurable step-down switched-capacitor power converter fabricated using 180 nm CMOS process for low-power applications. The proposed Optimized Partial Series-Parallel (OPSP) topology aims to achieve an intermediate voltage conversion ratio while more effectively minimizing parasitic capacitor losses. improvement is realized by eliminating one of the flying capacitors, specially responsible largest swing, distinguishing it from previously reported (PSP) topology....

In this study, friction welding was applied to carbon steel tubes at a high speed condition achieve an eco-friendly process and superior mechanical performance. Friction is very efficient for joining materials without defects, especially with joint rods or tubes. For cold drawn (AISI 1020) were introduced as the base material successfully joined by welding. performed parameters of burn-off length (1, 2 5 mm). order analyze welds, electron backscattering diffraction method observed grain...

본 연구에서는 강우의 시 공간적 특성을 고려한 유역규모의 PMP 산정방법을 개발하여 기존의 산정방법과 비교 분석하였다. 산정방법은 한반도에서 발생했던 130 mm이상의 호우사상을 선정한 후에 각 호우의 범위에 있는 우량관측소의 강우자료를 이용하여 PMP를 산정한다. 반면에 연구에서 개발한 새로운 유역을 선정하고 지점의 시계열 활용하여 공간분포시킨 강우장 자료에 격자기반의 자동 탐색기법을 DAD 분석을 실시하였다. 그 후, 분석 호우최대화비를 곱하여 산정하였다. 기존에 산정된 PMP와 면적확률강우량과 비교한 결과, PMP보다 PMP가 낮게 산정되었지만, 200년 빈도 48시간 면적확률강우량보다는 크게 것을 볼 수 있었다. 따라서 깅우분포를 고려할 제안된 방법은 정확도가 높은 장기간 데이터와 함께 PMF 및 빈도별 설계홍수량 산정에 유용하게 활용될 있을 것으로 기대된다. This study aims to develop a estimation method in basin-scale...

A novel 2.4-GHz Ternary Sequence Spread Spectrum (TSSS)-OOK Transceiver with spur suppression and dual-mode detection architecture is presented for the ULP wearable devices. random bi-phase switching of a PA rejects intrinsic spread spectrum OOK TX by 22dB. new TSSS-OOK supports spreading dual reception coherent as well non-coherent mode, implementing 12 dB SNR gain. The single-chip transceiver in 90nm CMOS occupies an active area 2.1mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

This brief introduces a current-mode DC-DC buck converter that operates without performance degradations, even when the inductance value changes. The proposed circuit can be widely utilized to ensure stable operation of various systems, as inductor values in PMICs may fluctuate despite being identical components. Inductance-Variation-Insensitive (IVI) directly senses rate change current and transmits information about output voltage dynamic ramp generator. generator produces signal...

This paper presents a novel high-precision 11-bit single-slope/successive approximation register analog-to-digital converter (SS/SAR ADC) architecture specifically designed for CMOS image sensors (CISs). The proposed design solves critical challenges in conventional ADCs by utilizing only two reference voltages, thereby minimizing voltage mismatch and completely eliminating the need complex switch arrays. unique approach reduces transistor count 64 per column ADC, significantly enhancing...

3D-IC is a novel semiconductor packaging technique stacking dies to improve the performance as well overall size. TSV ideal for because it convenient and excellent in electrical characteristics. However, due high-density micro-size of TSVs, they should be tested with non-invasive manner. Thus, we introduce test method on prober without direct contact this paper. A capacitive coupling effect between probe tip used discriminate small faults like voids pin-holes. Through EM simulation, can...

태양광발전소 두 곳을 샘플링하여 출력저하의 요인 중 우리나라 실정에 맞지 않는 입사각에 따른 태양전지 어레이 간의 음영에 의한 출력저하를 비교?분석하여 설비용량, 설비사양, 부지면적의 변화 없이 어레이의 재배치를 통해 최대 출력을 낼 수 있는 최적 간격을 산정한다.<BR> 1열 재배치 시에는 약 1.2[%], 2열 2.8[%], 3열 5.0[%]의 출력이 향상되었다. 또한 당 0.39[m], 0.82[m], 1.29[m]의 간격 이득을 얻었다. 간격에 이득이 생기면서 음영의 영향을 받게 되는 시간이 점점 늦춰지게 되고 결국 출력의 향상이 나타나는 결과를 보였다.

準好気性埋立地の浸出水集排水管内の空気流について, 集排水管が管網になっている場合の管内空気流速計算法を示し, 複雑な管網でもパソコンレベルの計算機で容易に計算できることを示した。さらに, 計算のための標準埋立地を設定して各種因子の影響を明らかにした。温度・加温因子については, 外気温度, 管壁温度, および管壁から管内空気への熱伝達係数の影響は管内空気温度上昇度という1つの尺度で評価できる。埋立深さの影響はほとんどなかった。主管の径は1m以上で最大の空気流入量を与え, 0.4m以下では十分な空気量を供給できない。枝管の径は小さいほど小さな空気流入量となり, 0.15m以下では十分な空気量を供給できない。管間隔については枝管間隔が大きい程小さな空気流量となるが, 50mまで大きくなっても十分な空気流入が可能である。

A non-contact TSV fault detection method is proposed using capacitive coupled probing. The detects faults by eye-pattern diagrams of extracted EM-modeled transfer characteristics. and a coupling modeled full wave analysis. Because the measurement conducted moving one top probe without contact alignment, it can achieve fast detection. Moreover, several TSVs be covered at measurement. From experimental results, existence no. detected with good resolutions.

This study aims to develop a PMP estimation method in basin-scale by considering both temporal and spatial characteristics compare the existing with developed this study. Since movement of heavy rainfall is predictable like typhoons, DAD analysis usually utilized storm centered fixed areal method. However, utilizing bigger basin area or longer duration induces more errors average thus reducing accuracy results. Therefore, new necessary improve accuracy. In study, method, was estimated...