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이류체 세정공정에서 이물질 포집 장치 개발에 관한 수치적 연구
김영웅(Young Woong Kim),신규식(Gyu Sik Shin),조기영(Ki Yeong Jo),양시영(Si Young Yang),김형민(Hyung Min Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
The purpose of the research is to develop a device to prevent secondary contamination by particles removed in the cleaning process of small precision plastic lens injection molds. The particle capturing device consists of two-fluid jet injection inlet for cleaning and another inlet of atmospheric air to maintaining the cleaning effect and an outlet for inhale the particles by applying vacuum pressure. The optimal air intake size was 0.12L and the outer shape of the device was proposed to have an inclination of 45°. In addition, a baffle was installed between the injection and the suction port inside the device to maximize the cleaning and capturing effect. The optimal length of the baffle was evaluated by analyzing the flow and particle behavior. The length of the cylindrical shape of the baffle with a constant cross section is suitable for 1.8L, 2.4L, and 3L, and the optimal length for the conical shape of the baffle was evaluated to be 3L.
이류체 세정공정에서 이물질 포집 장치 개발에 관한 수치적 연구
김영웅(Young Woong Kim),신규식(Gyu Sik Shin),조기영(Ki Yeong Jo),양시영(Si Young Yang),김형민(Hyung Min Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
The purpose of the research is to develop a device to prevent secondary contamination by particles removed in the cleaning process of small precision plastic lens injection molds. The particle capturing device consists of two-fluid jet injection inlet for cleaning and another inlet of atmospheric air to maintaining the cleaning effect and an outlet for inhale the particles by applying vacuum pressure. The optimal air intake size was 0.12L and the outer shape of the device was proposed to have an inclination of 45°. In addition, a baffle was installed between the injection and the suction port inside the device to maximize the cleaning and capturing effect. The optimal length of the baffle was evaluated by analyzing the flow and particle behavior. The length of the cylindrical shape of the baffle with a constant cross section is suitable for 1.8L, 2.4L, and 3L, and the optimal length for the conical shape of the baffle was evaluated to be 3L.
2.496Gb/s MIPI M-PHY를 위한 기준 클록이 없는 이중 루프 클록 데이터 복원 회로
김영웅,장영찬,Kim, Yeong-Woong,Jang, Young-Chan 한국정보통신학회 2017 한국정보통신학회논문지 Vol.21 No.5
본 논문은 2.496Gb/s 데이터 레이트를 갖는 mobile industry processor interface (MIPI) M-PHY를 위한 기준 클록이 없는 이중 루프 클록 데이터 복원 회로(CDR : Clock and Data Recovery Circuit)를 제안한다. 제안하는 클록 데이터 복원회로는 적응형 루프 대역폭 조절 기법을 사용하여 적은 타임 지터를 가지면서 빠른 고정 시간을 가질 수 있다. 클록 데이터 복원회로는 주파수 고정 루프와 위상 고정 루프로 이루어진다. 제안하는 2.496Gb/s 기준 클록이 없는 이중 루프 클록 데이터 복원 회로는 1.2V 공급 전압을 갖는 65nm CMOS 공정을 이용하여 설계되었다. 2.496Gb/s pseudo-random binary sequence (PRBS)15 입력에서 시뮬레이션 된 출력 클록의 타임 지터는 $9.26ps_{p-p}$이다. 클록 데이터 복원 회로의 면적과 전력 소모는 각각 $400{\times}470{\mu}m^2$와 6.49mW이다. This paper presents a reference-less dual loop clock and data recovery (CDR) circuit that supports a data rate of 2.496 Gb/s for the mobile industry processor interface (MIPI) M-PHY. An adaptive loop bandwidth scheme is used to implement the fast lock time maintaining a low time jitter. To this scheme, the proposed CDR consists of two loops for a frequency locked loop and a phase locked loop. The proposed 2.496 Gb/s reference-less dual loop CDR is designed using a 65 nm CMOS process with 1.2 V supply voltage. The simulated peak-to-peak jitter of output clock is 9.26 ps for the input data of 2.496 Gb/s pseudo-random binary sequence (PRBS) 15. The active area and power consumption of the implemented CDR are $470{\times}400{\mu}m^2$ and 6.49 mW, respectively.
Reference Driver를 사용한 10비트 10MS/s 축차근사형 아날로그-디지털 변환기
손지수,이한열,김영웅,장영찬,Son, Jisu,Lee, Han-Yeol,Kim, Yeong-Woong,Jang, Young-Chan 한국정보통신학회 2016 한국정보통신학회논문지 Vol.20 No.12
본 논문은 reference driver를 이용한 10비트 10MS/s 축차근사형(SAR: Successive Approximation Register) 아날로그-디지털 변환기(ADC: Analog-to-Digital Converter)를 제안한다. 제안하는 SAR ADC는 커패시터형 디지털-아날로그 변환기(CDAC: Capacitive Digital-to-Analog Converter), 비교기, SAR 로직, 그리고 공급 전압 노이즈에 대한 내성을 향상시키는 reference driver로 구성된다. ${\pm}0.9V$의 아날로그 입력전압을 가지는 SAR ADC를 위해 reference driver는 0.45V, 1.35V의 기준 전압을 생성한다. 설계된 SAR ADC는 $0.18{\mu}m$ CMOS 공정을 이용하여 제작되었으며 1.8V의 공급전압을 사용하였다. 제안된 SAR ADC는 reference driver를 이용하여 +/- 200mV의 공급 전압 변화에서도 ${\pm}0.9V$의 입력 범위를 유지한다. 10MS/s의 샘플링 주파수에서 5.32mW의 전력을 소모한다. 측정된 ENOB는 9.11 비트 이며, DNL과 INL은 각각 +0.60/-0.74 LSB와 +0.69/-0.65 LSB이다. This paper presents a 10 bit successive approximation register (SAR) analog-to-digital converter (ADC) with a reference driver. The proposed SAR ADC consists of a capacitive digital-to-analog converter (CDAC), a comparator, a SAR logic, and a reference driver which improves the immunity to the power supply noise. The reference driver generates the reference voltages of 0.45 V and 1.35 V for the SAR ADC with an input voltage range of ${\pm}0.9V$. The SAR ADC is implemented using a $0.18-{\mu}m$ CMOS technology with a 1.8-V supply. The proposed SAR ADC including the reference driver almost maintains an input voltage range to be ${\pm}0.9V$ although the variation of supply voltage is +/- 200 mV. It consumes 5.32 mW at a sampling rate of 10 MS/s. The measured ENOB, DNL, and INL of the ADC are 9.11 bit, +0.60/-0.74 LSB, and +0.69/-0.65 LSB, respectively.
나선형 마이크로/나노 로봇의 규모와 표면특성이 유영에 미치는 영향에 관한 수치적 연구
신규식(Gyu Sik Shin),조기영(Ki Yeong Jo),김영웅(Young Woong Kim),양시영(Si Young Yang),김형민(Hyung Min Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
This study analyzed the swimming characteristics of helical micro/nano robots in the no-slip condition and the slip condition. For the micro/nano scales with Knudsen number greater than 0.01, the Maxwell slip model was applied to analyze the effect of slip on the wall. Micro/nano swimming robot with a large Knudsen number had a large slip effect, which caused the swimming speed to be relatively slow. Meanwhile, the flow characteristics were analyzed considering the effects of hydrophilicity and hydrophobicity on slip. We found that even if the Knudsen number is constant, when the surface effect of the swimming robot is hydrophilic, the propulsion force increases compared to the case of hydrophobicity. The propulsion efficiency also demonstrated the same trend as the swimming speed, and the maximum efficiency was 0.097%, which is the efficiency of the no-slip condition on the wall.
나선형 마이크로/나노 로봇의 규모와 표면특성이 유영에 미치는 영향에 관한 수치적 연구
신규식(Gyu Sik Shin),조기영(Ki Yeong Jo),김영웅(Young Woong Kim),양시영(Si Young Yang),김형민(Hyung Min Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
This study analyzed the swimming characteristics of helical micro/nano robots in the no-slip condition and the slip condition. For the micro/nano scales with Knudsen number greater than 0.01, the Maxwell slip model was applied to analyze the effect of slip on the wall. Micro/nano swimming robot with a large Knudsen number had a large slip effect, which caused the swimming speed to be relatively slow. Meanwhile, the flow characteristics were analyzed considering the effects of hydrophilicity and hydrophobicity on slip. We found that even if the Knudsen number is constant, when the surface effect of the swimming robot is hydrophilic, the propulsion force increases compared to the case of hydrophobicity. The propulsion efficiency also demonstrated the same trend as the swimming speed, and the maximum efficiency was 0.097%, which is the efficiency of the no-slip condition on the wall.