• Proceedings of the Korean Society of Computer Information Conference
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• 2022.07a
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• pp.631-632
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• 2022

본 논문에서는 새로운 TOF 센서를 개발하고자한다. 첫째, 카메라의 화소값과 TOF의 센서의 거리값을 융합하도록 한다. 둘째, 객체의 점유 정보와 위치 정보를 제공하는 TOF 센서를 개발한다. 개발된 센서는 스쿨버스, 학원버스, 시내버스, 화물차(승용차 적용가능)에 적용 가능 하다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.05a
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• pp.670-671
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• 2022

In this paper, we intend to develop a new TOF sensor that provides object occupancy information and location information by fusing the pixel value of the camera and the distance value of the TOF sensor. The developed sensor can be applied to school buses, school buses, city buses, and trucks (applicable to passenger vehicles).

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.10a
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• pp.411-413
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• 2022

In this paper, considering the change in the sensing distance according to FoV(Fiele Of View) and the sensing distance according to the reflector, the installation location of the TOF(Time Of Flight) sensor is divided into side part installation and front/rear part installation.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.295-296
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• 2023

VR 헬스장은 시간적 부담과 이동이 힘든 사람들이 운동을 편안하고 정확한 자세로 할 수 있도록 온라인 헬스와 VR 기기를 접목한 가상현실 기반의 헬스케어 시스템이다. tof 센서가 장착되어 있는 카메라를 통해 주변 지형지물과 실제 몸의 움직이는 모션 정보를 정확하게 전달하여 원하는 장소에서 정확한 자세로 PT를 받을 수 있도록 한다. 원하는 시간과 장소에서 하고 싶은 운동을 할 수 있게 제공하여 시공간에 제약받는 사람도 꾸준한 운동을 통해 건강관리가 가능하여 운동하는 사람이 증가하는 것에 의의가 있다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.2
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• pp.355-362
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• 2013

A hardware implementation of phase calculator for extracting 3D depth image from TOF(Time-Of-Flight) sensor is described. The designed phase calculator, which adopts a pipelined architecture to improve throughput, performs arctangent operation using vectoring mode of CORDIC algorithm. Fixed-point MATLAB modeling and simulations are carried out to determine the optimized bit-widths and number of iteration. The designed phase calculator is verified by FPGA-in-the-loop verification using MATLAB/Simulink, and synthesized with a TSMC 0.18-${\mu}m$ CMOS cell library. It has 16,000 gates and the estimated throughput is about 9.6 Gbps at 200Mhz@1.8V.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.07a
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• pp.373-375
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• 2011

최근 들어, Time-of-Flight (TOF) 방식의 깊이 센서가 컴퓨터 비전이나 영상처리분야 등의 연구에서 다양하게 활용되고 있다. TOF 방식의 깊이 센서는 실시간으로 정확한 깊이 정보를 획득할 수 있는 장점이 있는 반면, 해상도가 낮고 센서의 광학적 특성으로 인해 노이즈가 발생한다는 단점이 있다. 본 논문에서는 이러한 깊이 센서의 단점을 극복하고 고품질의 다시점 영상 합성을 위해 기존 깊이 센서에 여러 대의 Charge-coupled Device (CCD) 카메라를 결합하여 시점 간 일관성 있는 고해상도의 깊이 영상을 획득하는 기술을 제안한다. 한정되어 있는 시점의 영상을 이용하여 다시점 영상을 합성할 때, 각 시점에 해당하는 깊이 영상의 정확도에 따라 합성되는 영상의 품질이 결정된다. 따라서 보유 시점에 해당하는 깊이 영상 간의 일관성이 유지되고 객체의 경계가 정확히 보존되어야만 생성되는 임의 시점 영상의 품질이 보장될 수 있다. 이에, 본 논문에서는 Joint Bilateral Upsampling (JBU)을 기반으로 시점 간 일관성을 고려한 깊이 영상의 해상도 개선 기술을 제안하고 이를 통해 다시점 영상 합성 결과의 품질을 향상시킨다.

• Journal of Sensor Science and Technology
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• v.14 no.1
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• pp.1-6
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• 2005

This paper describes a novel concept of a chemically sensitive scanning force microscope (CS-SFM). It consists of the conventional SFM and the time-of-flight mass spectrometer (TOF-MS). A switchable cantilever (SC) fabricated by the micromachining technology combines each advantage of two completely different systems, SFM and TOF-MS. The CS-SFM offers to produce both images of topography and chemical information simultaneously. First we employed a rotatable tip holder based on 4 piezotube actuators for demonstration of the possibility of the CS-SFM concept. Second the CS-SFM concept is optimized with the micromachining technology. The micromachined SC with an integrated bimorph actuator and a piezoresistive strain sensor provides a reasonable switching speed of ${\sim}10$ ms which is very attractive for the CS-SFM application. The SC is currently being integrated in an ultra-high-vacuum system to perform various experiments.

• Journal of the Korean Society of Radiology
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• v.13 no.6
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• pp.841-846
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• 2019

Effect of misalignment on the performance was evaluated for the development of time-of-flight(TOF)-PET detector. A pair of TOF-PET detector consists of Lutetium-yttrium oxyorthosilicate(LYSO) scintillation crystal with a volume of 3 mm × 3 mm × 20 mm and Geiger-mode avalanche photodiodes(GAPD) photo-sensor with a active area of 3.07 mm × 3.07 mm. Analog output signals from TOF-PET detector were sent to the pre-amplifier and then fed into the gain adjust circuit for achievement of gain homogeneity for each detector. The amplified signals were recorded and digitized by data acquisition system based on oscilloscope. The effect of the detector misalignment between LYSO and GAPD was examined for four different alignment offsets of 0.0 mm, 0.5 mm, 1.0 mm and 1.5 mm for a pair of TOF-PET detector. The photopeak position decreased from ~400 mV to ~250 mV with increasing detector misalignment. the energy resolution and time resolution were degraded from 11.6% to 16.2%, and from 477 ps to 632 ps, respectively. This study demonstrated that PET detector performance was degraded considerably depending on the detector misalignment, which would be a critical issue for the development of TOF-PET detector.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.06a
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• pp.293-298
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• 2013

This research develops an ultrasonic sensor to measure the distance in underwater. The ultrasonic transducer transmits an acoustic signal to an object and receives the echo signal reflected from the object. The ultrasonic driver calculates a distance by multiplying the acoustic speed to the time of flight(TOF) which is the time necessary for the acoustic signal to travel from the transducer to the object. We apply a thresholding and a cross correlation methods to detect the TOF and show their results. When an echo pulse is corrupted with noise and its shape is distorted, the cross correlation method is used to find the TOF based on the maximum similarity between the reference and the delayed echo signals. The echoes used for the reference signal are achieved at the different environments, which improves the performance of the sensor. This paper describes the driver of the acoustic sensor and analyzes the performance of sensors in different measurement environments.

• Analytical Science and Technology
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• v.18 no.6
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• pp.483-490
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• 2005

Mass resolution of the time of flight aerosol mass spectrometer for an aerosol component analysis depends on the initial direction and the initial energy of the ions. We have found that the shape of the optimum post focusing electric field is not linear. The maximum electric potential should be applied to the ions whose initial direction is 90 degree. To check on the post focusing effects, we have installed a laser ablation mass spectrometer. By using this LA-MS, we have found that the average energy distribution of the laser ablated ions is 8 eV. To establish the optimum mass resolution, a time delay and a high voltage are needed, and the results of the study show that 1500 nsec, and 3.7 kV are the optimum parameters for our system respectively. The isotope mass signals of copper show a good resolution.