Position Tracking Technique Research Articles

Utility of knife-edge position tracking in cycloidal computed tomography.

Cycloidal computed tomography provides high-resolution images within relatively short scan times by combining beam modulation with dedicated under-sampling. However, implementing the technique relies on accurate knowledge of the sample's motion, particularly in the case of continuous scans, which is often unavailable due to hardware or software limitations. We have developed an easy-to-implement position tracking technique using a sharp edge, which can provide reliable information about the trajectory of the sample and thus improve the reconstruction process. Furthermore, this approach also enables the development of other innovative sampling schemes, which may otherwise be difficult to implement.

Dynamic workspace control method for underwater manipulator of floating ROV

This paper presents a dynamic workspace control method of underwater manipulator mounted on a floating ROV (Remotely Operated vehicle) in undersea. This method is developed for precise linear motion control of a manipulator’s end-effector considering the motion of a floating ROV caused by sea wave. In the proposed method, the motion of ROV is modeled as nonlinear first-order differential equation. For online manipulator control achievement, the position tracking technique based on extended Kalman filter (EKF) and the input velocity compensation technique for differential inverse kinematics solution are applied. In addition, for precise workspace control, the third-order differential inverse kinematics is utilized. In this paper, the proposed method is verified by both experimental data based test of ROV position tracking and simulations of the proposed control method. In these tests, the specification of the KIOST deep-sea ROV Hemire is utilized.

위치기반 서비스 및 증강현실을 이용한 유비쿼터스 박물관(U-Seum)의 설계 및 구현

본 논문에서는 LBS(Location Based Service)와 모바일 증강현실 기술을 적용한 U-seum(유비쿼터스 박물관) 시스템의 설계 및 구현 결과를 제시하였다. 유비쿼터스 환경의 스마트 공간에서의 모바일 서비스는 다양한 분야로 확장되고 있다. 본 연구에서는 LBS 기반의 Wi-Fi를 이용한 위치 추적기술과 모바일 증강현실 기술을 활용한 모바일 기반 박물관 관람 서비스인 U-seum을 설계 개발하였다. 위치추적에 널리 사용되는 GPS 기술은 송신자와 수신자 사이에 Line-of-Sight를 요구하기 때문에 박물관과 같은 실내에서는 사용하기 어렵다는 단점을 가지고 있다. 따라서 본 논문에서는 실내 위치추적에 적합한 Wi-Fi 신호의 세기를 이용한 거리를 측정을 적용하여 세계적인 유네스코 문화유산인 화성 박물관 내에서 실시간 체험형 관광 서비스를 개발하고 실제 필드에서 성능 테스트를 수행하였다. U-Seum은 박물관내에서 스마트폰 사용자가 특정 지점에 다다르면 AP를 통한 푸시 서비스를 통하여 박물관내 유물을 설명하는 모바일 증강현실 서비스, 게임 서비스 및 관광 통계정보 등을 제공한다. U-Seum은 화성문화재단의 협조를 받아 화성 박물관에서 실제 구현 실행되었으며 개발된 서비스의 우수성 및 확장성을 입증하였다. This paper presents a design and implementation of U-Seum(Ubiquitous Museum) system based on the LBS(Location Based Service) and mobile augmented reality technique. The mobile services under the smart space of the ubiquitous environments have been expanded in the various fields. In this study, we introduce U-Seum which supports tourists in the museum. U-Seum is developed by use of the position tracking technique based on Wi-Fi and mobile augmented reality. The GPS which is widely used in the position tracking has a difficulty to be utilized in the inside of the building because it requires the Line-of-Sight between a sender and a receiver. Therefore, in this paper, we develop a realtime tour-supported service through experience and evaluate the performance of the system in the world famous UNESCO's Hwa-Seong Museum by measuring the distance from the Wi-Fi signal which is suitable to track the position interior of the museum. U-Seum provides various push services such as mobile augmented reality service for explanation of the artifacts of the museum, game services and the statistics information of the tourist when the tourist approach a specific AP. U-Seum is developed in the Haw-Seong Museum by the support of the Swon Haw-Seong Cultural Foundation. With a field test, we prove that the excellence and expandability of the system.

Tests of a practical visible-NIR imaging Fourier transform spectrometer for biological and chemical fluorescence emission measurements

An imaging Fourier transform spectrometer (IFTS) designed for fluorescence emission measurements is reported. The spectral range extension from NIR to visible of the system is realized by using a simple and low-cost optical beam-folding position-tracking technique. Spectral resolution as high as 9.78cm(-1)(0.4nm at 632.8nm) and maximum image resolution up to 300x300 pixels are proved by the system tests on its optical performances. Imaging fluorescence spectra acquisition of quantum dot clusters and single 200nm diameter fluorescent beads have demonstrated the system's potential for high throughput imaging spectroscopic measurements of fluorescent biological and chemical samples.