Semantic 3d city models can serve as anchor points for different components of urban digital twins. In addition to static 3d models such as buildings, transportation infrastructure, vegetation, or city furniture, this...
详细信息
Semantic 3d city models can serve as anchor points for different components of urban digital twins. In addition to static 3d models such as buildings, transportation infrastructure, vegetation, or city furniture, this can also include dynamic processes such as traffic movement or changing traffic signals. Integrating these aspects into a dynamic, realistic, and accessible 4d visualization presents a number of requirements and challenges, which are discussed. While the City Geography Markup Language (CityGML) is a well established OGC standard for modeling and exchanging semantic 3d city models, the Cesium Language (CZML) provides capabilities for visualizing time-dependant properties that can be displayed in the Cesium virtual globe. Results of the open-source microscopic traffic simulation tool SUMO include information on locations and orientations of vehicles, bicycles, pedestrians and other traffic members as well as traffic signal information and can be exported as a CSV table. In order to allow a 4d visualization of these simulation results, a scheme for deriving 3d + t CZML documents from data given as 2d + t CSV files is presented. Additionally, dynamically changing traffic lights are integrated. Based on data available for the city of Munich, a CityGML-compliant streetspace model is generated. This enables the combination of traffic simulation results and semantic 3d city models within a common Cesium based web-visualization and allows a direct and platform independent access to realistic visualizations of streetspace activities. Since this often results in a huge amount of data, a spatio-temporal tiling strategy enabling the visualization of large CZML data is presented.
At present, the existing technology has not yet realized the conversion process from the digital design model of the substation project to the construction model. This paper provides a solution to this problem. After ...
详细信息
At present, the existing technology has not yet realized the conversion process from the digital design model of the substation project to the construction model. This paper provides a solution to this problem. After the design model GIM is loaded into unity, the vertices and materials of the GIM model are read and loaded into the scene through the company's independent research anddevelopment of three-dimensional design software (STd-R). The model level information returned by the terminal corresponds to the loaded model one by one, thereby obtaining a model tree structure. The research results of the thesis provide convenience for the design and construction of power grid substation projects.
Most cultural heritage applications address visualization with using various media or platforms: desktop-based multimedia presentations, museum kiosks, or videos produced with computer animation. However, these techni...
详细信息
ISBN:
(纸本)9781629935201
Most cultural heritage applications address visualization with using various media or platforms: desktop-based multimedia presentations, museum kiosks, or videos produced with computer animation. However, these techniques can not directly reveal or show the course that the colorful surface of painted sculpture and murals becomes faint along with the change of the climate and time. Most current techniques just preserve the current appearance anddisseminate the current situation of the painted sculpture and murals. The course how these forms of cultural heritage change along the time has not been visualized. In this paper we developed an approach to modelling of painted sculpture and murals that has undergone changes over the years. different hypotheses has also be given if there is uncertainty. A painted sculpture of Mogao Grottoes is used to demonstate this approach.
Estimation of muscle activity using surface electromyography (sEMG) is an important non-invasive method that can lead to a deeper understanding of motor-control strategies in humans. Measurement using multiple active ...
详细信息
Estimation of muscle activity using surface electromyography (sEMG) is an important non-invasive method that can lead to a deeper understanding of motor-control strategies in humans. Measurement using multiple active electrodes is necessary to estimate not only surface muscle activity but also deep muscle activity in dynamic motion. In this paper, we propose a method for estimating muscle activity of dynamic motions based on anatomical knowledge of muscle structures. To estimate muscle activity, a large number of signal sources are set in the muscle model, and connections between the signal sources are defined a priori based on the anatomical structure of the muscles. The signal source activities are first estimated by minimizing the Kullback-Leibler divergence with a continuity cost. Then, the muscle activity is computed from the signal source activity. In the experiments, five healthy participants performed five types of motion and the forearm sEMG was measured with 20-channel active electrodes. The estimation results for these motions were visualized in four dimensions as the three-dimensional position of the muscle over time. The results showed that the estimation was accurate, with a reproduction rate of 95% for the measured sEMG and continuity of the muscle activity. In addition, the results suggest the advantage of the proposed method over the conventional approaches in terms of estimating the muscle activity for both dynamic and abnormal motions.
In northern Canada, due to the harsh weather and high labor cost, contractors prefer to using modular construction approach to complete heavy industrial projects, where mobile crane are used for onsite module installa...
详细信息
In northern Canada, due to the harsh weather and high labor cost, contractors prefer to using modular construction approach to complete heavy industrial projects, where mobile crane are used for onsite module installations. In current practice, module lifts are often planned manually by rigging engineers. With a large number of heavy lifts to be analyzed per project, the planning process is tedious and error prone. This paper represents a data-driven crane management system with three features: (1) identification of design errors in lifting planning;(2) responses to design changes;and (3) dynamic 3d trajectory-based lifting visualization. It covers two types of crane operations: pick from a fixed location, and pick and walking operation. This developed system helps reduce lifting time and improves safety and quality, where various lifting scenarios need to be analyzed. The system has been implemented at a collaborator company for demonstration and validation.
Purpose Magnetic particle imaging (MPI) is a novel tomographic radiation-free imaging technique that combines high spatial resolution and real-time capabilities, making it a promising tool to guide vascular interventi...
详细信息
Purpose Magnetic particle imaging (MPI) is a novel tomographic radiation-free imaging technique that combines high spatial resolution and real-time capabilities, making it a promising tool to guide vascular interventions. Immediate availability of 3d image data is a major advantage over the presently useddigital subtraction angiography (dSA), but new methods for real-time image analysis andvisualization are also required to take full advantage of the MPI properties. This laboratory study illustrates respective techniques by means of three different patient-specific 3d vascular flow models. Material and Methods The selected models corresponded to typical anatomical intervention sites. Routine patient cases and image data were selected, relevant vascular territories segmented, 3d models generated and then 3d-printed. Printed models were used to perform case-specific MPI imaging. The resulting MPI images, direct volume rendering (dVR)-based fast 3dvisualization options, and their suitability to advance vascular interventions were evaluated and compared to conventional dSA. Results The experiments illustrated the feasibility and potential to enhance image interpretation during interventions by using MPI real-time volumetric imaging and problem-tailoreddVR-based fast (approximately 30 frames/s) 3dvisualization options. These options included automated viewpoint selection and cutaway views. The image enhancement potential is especially relevant for complex geometries (e.g., in the presence of superposed vessels). Conclusion The unique features of the as-yet preclinical imaging modality MPI render it promising for guidance of vascular interventions. Advanced fast dVR could help to fulfill this promise by intuitive visualization of the 3d intervention scene in real time.
In the dual-stream model of language processing, the exact connectivity of the ventral stream to the anterior temporal lobe remains elusive. To investigate the connectivity between the inferior frontal gyrus (IFG) and...
详细信息
In the dual-stream model of language processing, the exact connectivity of the ventral stream to the anterior temporal lobe remains elusive. To investigate the connectivity between the inferior frontal gyrus (IFG) and the lateral part of the temporal and parietal lobes, we integrated spatiotemporal profiles of cortico-cortical evoked potentials (CCEPs) recorded intraoperatively in 14 patients who had undergone surgical resection for a brain tumor or epileptic focus. Four-dimensional visualization of the combined CCEP data showed that the pars opercularis (Broca's area) is connected to the posterior temporal cortices and the supramarginal gyrus, whereas the pars orbitalis is connected to the anterior lateral temporal cortices and angular gyrus. Quantitative topographical analysis of CCEP connectivity confirmed an anterior-posterior gradient of connectivity from IFG stimulus sites to the temporal response sites. Reciprocality analysis indicated that the anterior part of the IFG is bidirectionally connected to the temporal or parietal area. This study shows that each IFG subdivision has different connectivity to the temporal lobe with an anterior-posterior gradient and supports the classical connectivity concept of dejerine;that is, the frontal lobe is connected to the temporal lobe through the arcuate fasciculus and also a double fan-shaped structure anchored at the limen insulae.
Magnetic particle imaging (MPI) is a relatively young, radiation-free imaging modality that measures the interaction between superparamagnetic nanoparticles and magnetic fields. Compared to standard imaging modalities...
详细信息
ISBN:
(纸本)9781510625549
Magnetic particle imaging (MPI) is a relatively young, radiation-free imaging modality that measures the interaction between superparamagnetic nanoparticles and magnetic fields. Compared to standard imaging modalities, a key feature of MPI is its ability to measure 3d volumes of relatively high spatial resolution in real-time, while still maintaining high sensitivity. Therefore, MPI is considered promising especially for vascular imaging and interventions. Yet, to fully take advantage of the unique MPI properties, real-time 4d imaging has to be combined with appropriate real-time 4d visualization and image analysis techniques. The current work aims at identification of respective clinical use cases and scenarios to illustrate the potential of MPI in the context of vascular imaging and interventions;the implementation and exploration of suitable visualization and image analysis techniques;and evaluation and comparison of the resulting image data to standard clinical imaging approaches. The study is based on three clinical use cases and associated anatomical sites: mechanical thrombectomy (anatomical structure: middle cerebral artery, segments M1 and M2);endovascular coiling (internal carotid artery aneurysm);and chemoembolization (proper hepatic artery). Implementedvisualization and image analysis options are based on direct volume rendering and cover aspects like optimal view point and view angle selection and application of cut-away views. We illustrate that combining MPI imaging and4d visualization helps to improve vascular image interpretation.
The reliable maintenance management system of medical equipment influences the patients' treatment and the hospitals' performance. Although building information modeling (BIM) technology has evolved the constr...
详细信息
The reliable maintenance management system of medical equipment influences the patients' treatment and the hospitals' performance. Although building information modeling (BIM) technology has evolved the construction industry, it does not fully comply with the facility management (FM) industry, particularly with repair and maintenance. BIM-based FM provides a structured platform to effectively capture necessary data during the construction stage for effective facility maintenance management (e.g., prioritizing maintenance work orders). despite the design improvements and preventive maintenance plans, unplanned failures are inevitable and need quick and appropriate reactions. This paper introduces an integrated BIM-based framework for effective facility maintenance management. This framework consists of an integrated maintenance database for medical equipment, a scheduling engine to prioritize and sequence work orders, and a 4d simulation module to visualize the work-order handling process semiautomatically. Case-based reasoning (CBR) is also employed in the simulation engine to capture expert knowledge and facilitate the sequencing process. The proposed framework's capabilities are demonstrated by applying and validating in a national healthcare facility in Iran.
Purpose Construction industry bears a lot of casualties and accidents more than other high-risk industries annually. Thus, the use of new technologies such, as building information modeling, automatic rule checking, i...
详细信息
Purpose Construction industry bears a lot of casualties and accidents more than other high-risk industries annually. Thus, the use of new technologies such, as building information modeling, automatic rule checking, information technology-based safety systems in order to implement the rules and safety standards, better controls the performance of workers on site and make high coordination between operational executives, leading to create a secure environment in projects by reducing accidents. The paper aims to discuss these issues. design/methodology/approach - In this study, a researcher-designed questionnaire was distributed among 200 companies that are active in the field of construction to evaluate the effect of building informationmodel (BIM) for safety projects and barriers to adoption. Only 70 percent of questionnaires were returned. Statistical Package for the Social Sciences analysis has been used to determine the correlation coefficient among the respondents. Findings - The results show the factors that lead to failure in the adoption of BIM in Iran are lack of well-trained personnel, proper social infrastructure, guidance and governmental supports. Originality/value - Finally, the authors presented solutions for overcoming barriers and proposed some factors leading to the successful adoption of BIM in Iran.
暂无评论