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Cable Tension Control and Analysis of Reel Transparency for 6-DOF Haptic Foot Platform on a Cable-Driven Locomotion Interface

Year: 2009 Volume: 3 Issue: 4 425 - 437 Pages

• Authors:
• Martin J.-D. Otis
• Thien-Ly Nguyen-Dang
• Thierry Laliberte
• Denis Ouellet
• Denis Laurendeau
• Clement Gosselin

Abstract: A Cable-Driven Locomotion Interface provides a low inertia haptic interface and is used as a way of enabling the user to walk and interact with virtual surfaces. These surfaces generate Cartesian wrenches which must be optimized for each motorized reel in order to reproduce a haptic sensation in both feet. However, the use of wrench control requires a measure of the cable tensions applied to the moving platform. The latter measure may be inaccurate if it is based on sensors located near the reel. Moreover, friction hysteresis from the reel moving parts needs to be compensated for with an evaluation of low angular velocity of the motor shaft. Also, the pose of the platform is not known precisely due to cable sagging and mechanical deformation. This paper presents a non-ideal motorized reel design with its corresponding control strategy that aims at overcoming the aforementioned issues. A transfert function of the reel based on frequency responses in function of cable tension and cable length is presented with an optimal adaptative PIDF controller. Finally, an hybrid position/tension control is discussed with an analysis of the stability for achieving a complete functionnality of the haptic platform.

• Keywords:
• haptic
• reel
• transparency
• cable
• tension
• control

Efficient CT Image Volume Rendering for Diagnosis

Year: 2012 Volume: 6 Issue: 12 710 - 712 Pages

• Authors:
• HaeNa Lee
• Sun K. Yoo

Abstract: Volume rendering is widely used in medical CT image visualization. Applying 3D image visualization to diagnosis application can require accurate volume rendering with high resolution. Interpolation is important in medical image processing applications such as image compression or volume resampling. However, it can distort the original image data because of edge blurring or blocking effects when image enhancement procedures were applied. In this paper, we proposed adaptive tension control method exploiting gradient information to achieve high resolution medical image enhancement in volume visualization, where restored images are similar to original images as much as possible. The experimental results show that the proposed method can improve image quality associated with the adaptive tension control efficacy.

• Keywords:
• Tension control
• Interpolation
• Ray-casting
• Medical imaging analysis.

The Care Management Network as an Effective Intervention in Mitigating the Risks of Hypertension

Year: 2010 Volume: 4 Issue: 1 6 - 9 Pages

• Authors:
• Feng-Chuan Pan
• Fang-Yue Liu

Abstract: Hospitals in southern Hualien teamed with the Hypertension Joint Care Network. Working with the network, the team provided a special designed health education to the individual who had been identified as a hypertension patient in the outpatient department. Some metabolism improvements achieved. This is a retrospective study by purposively taking 106 patients from a hospital between 2008 and 2010. Records of before and after education intervention of the objects was collected and analyzed to see the how the intervention affected the patients- hypertension control via clinical parameter monitoring. The results showed that the clinical indicators, the LDL-C, the cholesterol and the systolic blood pressure were significantly improved. The study provides evidence for the effectiveness of the network in controlling hypertension.

• Keywords:
• hypertension
• joint care management network
• cardiovascular diseases
• metabolic syndrome.