• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2005년도 춘계학술대회 논문집
• /
• pp.240-245
• /
• 2005

In order to implement nano-level accuracy of precision equipments, a nano control system is one of the key components. The control system consists of a controller, actuators and sensors having nano-level resolution. In this paper, application area and technical trend on the nano control system are introduced. Some required techniques for realizing nano-level resolution of a controller or actuator are presented. Technical innovation of a control system by IT-fusion and its effect are also described. Finally, domestic research activities for development of the IT-based nano control system are introduced.

• Journal of Microbiology and Biotechnology
• /
• 제32권4호
• /
• pp.531-540
• /
• 2022

Due to the high incidence of malignant melanoma, the establishment of in vitro models that recapitulate the tumor microenvironment is of great biological and clinical importance for tumor treatment and drug research. In this study, 3D printing technology was used to prepare GelMA/PEGDA composite scaffolds that mimic the microenvironment of human malignant melanoma cell (A375) growth and construct in vitro melanoma micro-models. The GelMA/PEGDA hybrid scaffold was tested by the mechanical property, cell live/dead assay, cell proliferation assay, cytoskeleton staining and drug loading assay. The growth of tumor cells in two- and three-dimensional culture systems and the anti-cancer effect of luteolin were evaluated using the live/dead staining method and the Cell Counting Kit-8 (CCK-8) method. The results showed a high aggregation of tumor cells on the 3D scaffold, which was suitable for long-term culture. Cytoskeleton staining and immunofluorescent protein staining were used to evaluate the degree of differentiation of tumor cells under 2D and 3D culture systems. The results indicated that 3D bioprinted scaffolds were more suitable for tumor cell expansion and differentiation, and the tumor cells were more aggressive. In addition, luteolin was time- and dose-dependent on tumor cells, and tumor cells in the 3D culture system were more resistant to the drug.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2000년도 하계학술대회 논문집 C
• /
• pp.2242-2244
• /
• 2000

시분할 다중화 방식을 이용한 정전 구동형 XY 스테이지의 새로운 위치 검출 방법을 제안한다. 각축의 고정자에 90도의 위상차를 가지는 여기(excitation) 신호를 주입하여 스테이지와 연결된 1개의 charge amplifier와 S/H를 이용하여 x축과 y축 방향의 위치를 검출한다. charge amplifier의 파라미터는 DC 이득이 크고 또한 신호간 간섭이 발생하지 않도록 설정한다. 제안된 방법은 XY 스테이지의 디지털 서보 제어기의 구성요소인 S/H를 사용하기 때문에 기존의 방식과는 달리 위치 신호의 검출이 안정적이고 반송 신호에 의한 고조파 왜곡과 복조 과정에서 발생되는 지연을 현저히 줄일 수 있으며 간단하게 구현할 수 있다.

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2009년도 춘계학술대회
• /
• pp.627-630
• /
• 2009

해상용 Multi Sensor Surveillance System은 다양한 기술의 복합체로서 본 과제에서 개발하고자하는 Gyro Sensor based Servo Motion Control 알고리즘은 선박의 6자유도운동을 분석하여 그에 대응할 수 있는 Motion Control 동요안정화제어장치를 개발하는 것이며, Nano Driving Precision Pan-Tilt/Gimbal System은 초정밀 초고속으로 감시용 디바이스를 적시에 정확한 동작을 수행하게 해주는 필수적인 장비이다. 최종적으로 개발하고자 하는 분야는 해상용 Nano Driving Multi Sensor Surveillance System 중 Nano Driving Precision Pan-Tilt/Gimbal의 최적설계 및 제작, 3-axis Gyro Sensor based Servo Motion Control 알고리즘 개발, 영상추적 Video Tracking Software 및 Hardware의 개발 및 각 세부주관에서 개발한 각각의 장비를 하나의 시스템으로 통합하는 시스템 Integration 및 시험인증으로 하나의 시스템을 완성 하였다.

• 한국정밀공학회지
• /
• 제22권6호
• /
• pp.7-14
• /
• 2005

• International Journal of Control, Automation, and Systems
• /
• 제2권2호
• /
• pp.135-143
• /
• 2004

Recently, high throughput screening for microorganisms with desired characteristics from a large heterogeneous population has become possible. Single cell separation has taken on increasing significance in recent years, and several different methods have been proposed so far. In this paper, we introduce several cell manipulation methods aiming at single cell separation and investigation. At first, methods for the separation of microorganisms are classified. Then, we introduce two different approaches, that is, (1) indirect manipulation using laser trapped microtools and (2) thermal gelation.

• 정보저장시스템학회논문집
• /
• 제1권2호
• /
• pp.192-196
• /
• 2005

In this paper, we investigated the possibility of replicating patterned media by nano-injection molding process with a metallic nano-stamper. The original nano-master was fabricated by E-beam lithography and ICP etching process. The metallic nano-stamper was fabricated using a nanoimprint lithography and nano-electroforming process. The nano-patterned substrate was replicated using a nano-injection molding process without additional etching process. In nano-injection molding process, since the solidified layer, generated during the polymer filling, deteriorates transcribability of nano patterns by preventing the polymer melt from filling the nano cavities, an injection-mold system was constructed to actively control the stamper surface temperature using MEMS heater and sensors. The replicated polymeric patterns using nano-injection molding process were as small as 50 nm in diameter, 150 nm in pitch, and 50 nm in depth. The replicated polymeric patterns can be applied to high density patterned media.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2013년도 춘계학술대회 논문집
• /
• pp.221-222
• /
• 2013

• 한국광학회:학술대회논문집
• /
• 한국광학회 2008년도 하계학술발표회 논문집
• /
• pp.185-186
• /
• 2008

In this paper, the nano-grating was measured by Scanning Probe Microscopy (SPM) system using digital Proportion, Integration and Derivative (PID) control. Through this measurement, we could confirm the improvement of the vertical resolution compared with analog Proportion and Integration (PI) control method.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
• /
• pp.101-103
• /
• 2007

In this paper. we design a robust optimal controller for ultra-precision positioning system. Generally, it is hard to control the nanometric scale positioning system because of the parameter uncertainties and external disturbances. To solve this problem. we suggest a control algorithm based on the modified sliding-mode control and the LQ control in an augmented system. The augmented system is composed of additional state variables: state estimates and control input in the nominal system. Through comparison with LQ optimal control, it is verified that the proposed control algorithm is more robust to the unexpected parameter variations and external noises.