Applied Mechanics and Materials Vols. 300-301

Abstract: This paper presents the digital PI control method for design and simulation of a high precision limited angle brushless torque motor control system in Field Programmable Gate Array device (FPGA). The direct drive structures which are widely applied in many servo control fields. Matlab Xilinx System Generator^® toolbox based on Fixed-Point Arithmetic is used to design the digital PI controller using DSP architecture, plot the responses of the control system and generate the VHDL source code. The control system model consists of a digital PI, a real LABTM, and a real absolute Inductosyn, encoder to rpm and position blocks. Through loading generated codes in process of the simulation that built by the digital discrete model, it is verified that the rising time of current loop is only 1.2ms, and rate loop is 8ms, overshoot is rarely 4.2%. Finally, the comprehensive positioning accuracy of system can reach up to ±5 arc sec, and the rate jitter achieves 5% with the ±4 arc sec accuracy absolute Inductosyn.

Abstract: Since the angled deck is only tens miles width, the task of landing an aircraft on an aircraft carrier requires precise control, especially lateral loop. For this problem, this paper focuses on researching the aircraft automatic landing lateral control. In lateral control, the most crucial parts are controlling the off center distance and keeping the desired landing attitude. So firstly a nonlinear kinetic model of aircraft landing in lateral directional axis is established, and then transformed into error states. The controller is designed for an angle of attack of 11.7 deg and an airspeed of 40m/s, the equilibrium point. Receding horizon control methodology is employed to solve the aircraft lateral control problem. This controller is solved in MATLAB, and sent to the 3D simulation environment by network communication, to control the aircraft landing lateral loop. The simulation environment is programmed based on VC++ software. The simulation results show that receding horizon control method can achieve trajectory tracking and attitude tracking of nonlinear aircraft landing system.

Abstract: By analyzing the quality elements of traffic engineering, the spectra structure of quality characteristics of all levels of projects and parameters for traffic engineering will be established. Combined with the requirements of JT/T828-2012, the compilation method of experimentation & test data reports can be determined. It will promote the level of management standardization and refinement for experimentation & test organization, and will further improve the accuracy and objectivity of experimentation & test data.

Abstract: This study investigated the efficiency performance of the production technology of the Department of Health (DOH)-affiliated hospital system in Taiwan in different competitive environments. This study used Data Envelopment Analysis (DEA) to analyze a total of 396 hospitals of different systems in Taiwan. The results indicated that, in terms of the internal competitive environment, the production performance of hospital Q was the best, while that of hospital N was the worst. This study also analyzed the production performance and scale of DOH-affiliated hospitals and provided hospitals with a direction for scale development. Finally, this study proposed suggestions on improvement direction for hospitals with poor production performance. As for external competitive environment, there is no significant difference in the average efficiency among various hospital systems. However, there are a lot to be improved in DOH-affiliated hospitals, especially in the aspect of technology efficiency. The improvement of technology efficiency should be more beneficial to the overall efficiency.

Abstract: The research for viscoelasticity of small intestine become significant in engineering due to the development of new medicine instruments such as the capsule robot and intellectualized endoscopy, which may help learn the unknown mechanical interaction between the intestinal tissue and the instrument. Therefore, a research of testing the mechanics of intestinal tissue in this paper is presented, which may help cognize intestinal viscoelasticity. As distinct from the conventional stress relaxation test, DMA (Dynamical Mechanical Analyzer) is applied in the experiment, and a large number of data is obtained by DMA, which have not been used in this area before, and is able to reveal directly the essential viscoelastic parameters of the intestinal tissue. The experiment result explicit the dissipated energy becomes larger when the strain amplitude increases. The DMA test and the experiment analysis introduce a particular angle of view in researching the viscoelasticity of intestinal tissue, and that is convenient for quantitative analysis and synthesis for deeper cognizing intestine in the future.

Abstract: This study proposed a CCD-based (charge-coupled device) optical computed tomography scanner (CT-s2) for 3D gel dosimetry. A parallel laser light was generated to pass through the gel sample using a diffuser and collimating lens. A CCD was used to capture projection image of gel sample at each step. An image reconstruction algorithm, filtered-back projection (FBP) technique was used to reconstruct the 3D image. Two better rotational steps are suggested as 1.0 degree and 1.5 degree for considering both of angular resolution and position deviation. The un-irradiated and irradiated BANG gel samples were scanned and reconstructed using FBP technique. Some artifacts were found in reconstructed images. Some discussions for artifacts were conducted and some solutions provided by previous researches to reduce these artifacts will be evaluated in the future work.

Abstract: Based on Gent model, a new strain energy function is developed for the description of mechanical response of arterial wall, which fulfills the requirement that in the rigid condition and will thansform into Gent model when . By utilizing the modified strain energy function, inflation of arterial wall by internal pressure is researched. Stress distribution through the deformed arterial wall at cylindrical system is achieved based finite deformation theory. In order to analyze the deformation and stress field of arterial wall at different blood pressure, a user subroutine is programmed to implement the modified strain energy function from Gent into the program of MSC.Marc,. The results show that maximum radial stress and maximum circumferential stress all appear at inside wall. In the meanwhile, radial stress and circumferential stress become smaller along the wall thickness from inside to outside. It can seen the results of finite element analysis of arterial wall are accordant to the result of theoretical analysis, which approves that theoretical analysis is correct.

Abstract: At present, most of medical facilities are using PACS (Picture Archiving and Communication System) to manage various medical images. PACS is a medical image management system and the main purpose of PACS is to replace conventional film with digital images and to allow medical professionals to view digital photographs or images of diagnostic tests, interpretations and related data simultaneously from multiple sites. In the paper we further propose a Cloud image data platform which is suitable for managing medical images. This platform collaborates with PACS in medical facilities and it immediately delivers images captured by equipment via parallel connection to remote server in form of parallel streaming. Taking advantage of parallel streaming technology, we have solved the medical resources sharing problem and problem caused at delivering and storing consecutive high resolution image files. Patients who are to be transferred to other medical facilities will no longer re-do all examinations. This saves medical resources and physician’s precious time. Our experiments shows our parallel streaming delivering platform improves the transmission efficiency on LAN (Local Area Network), TANet (Taiwan Academic Network) and home-group network by 45.6％, 49.4％, and 8.1％ respectively in comparison with conventional single server system using FTP transmission.

Abstract: The electrical non-fiberoptic endoscope (ENFE) is primarily designed with no optical fiber. The illumination of a ENFE is important due to it affects the image quality of endoscope and the results of surgery. A investigations of the illumination of a ENFE are proposed in this paper. The illumination of ENFE is important due to it affects the image quality of endoscope and the results of surgery. The illuminations of orange-red inside were higher than the black inside. The illumination of rigid rod lens is 500 lux at 5 cm. The illuminations of ENFEs were decrease to 200 lux rapidly at 3 cm in case 4 although the illumination was over 1500 lux at first.

Abstract: Separation of rare cells such as fetal cells from blood has potential importance in disease investigation and prevention. In this paper we report a new method of cancer cells separation from patient’s blood by inertial focusing technique. A design and simulation of ascending and descending curvilinear microchannels for separation of particles resembling cancer cells have been presented. Computational fluid dynamics (CFD) design and simulation of ascending and descending microchannels is used for cell separation. The simulation was carried out in two stages including focusing and separation. The ascending curvilinear channel design demonstrated favorable focusing and separation. Separation with 100% purity and efficiency of the unwanted particle was achieved at Reynolds number (Re) = 8.50 and velocity 0.105m/s. Reynolds number 9.25 and 10.06 with corresponding velocities 0.115 m/s and 0.125 m/s were also investigated for cell seperation. In case of descending curvilinear channel, cell separation was not good. Considering cancer cells size about 15 µm, our proposed ascending microchannel is a good candidate for cancer cells separation from blood.