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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Computational Design and Engineering
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Journal DOI :
Society of CAD/CAM Engineers
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Volume & Issues
Volume 18, Issue 6 - Dec 2013
Volume 18, Issue 5 - Oct 2013
Volume 18, Issue 4 - Aug 2013
Volume 18, Issue 3 - Jun 2013
Volume 18, Issue 2 - Apr 2013
Volume 18, Issue 1 - Feb 2013
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Tool-path Generation for a Robotic Skull Drilling System
Chung, YunChan ;
Korean Journal of Computational Design and Engineering, volume 18, issue 4, 2013, Pages 243~249
DOI : 10.7315/CADCAM.2013.243
This paper presents a tool-path generation methods for an automated robotic system for skull drilling, which is performed to access to some neurosurgical interventions. The path controls of the robotic system are classified as move, probe, cut, and poke motions. The four motions are the basic motion elements of the tool-paths to make a hole on a skull. Probing, rough cutting and fine cutting paths are generated for skull drilling. For the rough cutting path circular paths are projected on the offset surfaces of the outer top and the inner bottom surfaces of the skull. The projected paths become the paths on the top and bottom layers of the rough cutting paths. The two projected paths are blended for the paths on the other layers. Syntax of the motion commands for a file format is also suggested for the tool-paths. Implementation and simulation results show that the possibility of the proposed methods.
An Event-Driven Failure Analysis System for Real-Time Prognosis
Lee, Yang Ji ; Kim, Duck Young ; Hwang, Min Soon ; Cheong, Young Soo ;
Korean Journal of Computational Design and Engineering, volume 18, issue 4, 2013, Pages 250~257
DOI : 10.7315/CADCAM.2013.250
This paper introduces a failure analysis procedure that underpins real-time fault prognosis. In the previous study, we developed a systematic eventization procedure which makes it possible to reduce the original data size into a manageable one in the form of event logs and eventually to extract failure patterns efficiently from the reduced data. Failure patterns are then extracted in the form of event sequences by sequence-mining algorithms, (e.g. FP-Tree algorithm). Extracted patterns are stored in a failure pattern library, and eventually, we use the stored failure pattern information to predict potential failures. The two practical case studies (marine diesel engine and SIRIUS-II car engine) provide empirical support for the performance of the proposed failure analysis procedure. This procedure can be easily extended for wide application fields of failure analysis such as vehicle and machine diagnostics. Furthermore, it can be applied to human health monitoring & prognosis, so that human body signals could be efficiently analyzed.
A Method for Visualizing a Large JT File of Ship Blocks in an Android Device
Cheon, Sanguk ; Suh, Heung-Won ;
Korean Journal of Computational Design and Engineering, volume 18, issue 4, 2013, Pages 258~266
DOI : 10.7315/CADCAM.2013.258
In shipbuilding, 2D manufacturing drawings are crucial for building a ship. Even various types of 3D models are being utilized for supporting ship manufacturing, which does not reduce the importance of 2D drawings. Recently things are changing in the shipbuilding industry. To reduce the number of 2D drawings or to reduce the quantity of information contained in 2D drawings, some attempts that can substitute for 2D drawings are being made. One of the attempts is to visualize lightweight 3D manufacturing models in a mobile device. In this paper, a method for displaying lightweight 3D models of a ship in an Android based device is introduced. To overcome the problem with parsing JT files in Android system, JT files are parsed in a Windows based server and as-simple-as-possible visualization data are transmitted to an Android based viewer. A comparison result with a commercial system is also given.
Pseudo-standard and Its Implementation for the Maintenance Data of Ship and Offshore Structures
Son, Gum-Jun ; Lee, Jang-Hyun ; Lee, Jeongyoul ; Han, Eun-Jung ;
Korean Journal of Computational Design and Engineering, volume 18, issue 4, 2013, Pages 267~274
DOI : 10.7315/CADCAM.2013.267
This study focuses on the data schema and data content, which includes maintenance data, data structures and illustration data relevant with the maintenance process of ship and offshore structures. Product lifecycle management (PLM) is expected to encompass all the product data generated for the operation and maintenance information as well as the design and production. This paper introduces a data exchange schema in PLM of ship and offshore, serving as the basis for the role of standards required by the middle-of-life PLM. Also this paper identifies a typology of standards relevant to PLM that addresses the schema of evolving standards and identifies a XML schema supporting the exchange of data related with maintenance operations. Technical document based on standards in accordance with S1000D and Shipdex is explained. A case study illustrating the use of standard data exchange and technical document is presented.
Neural Network-Based Human Identification Using Teeth Contours
Park, Sang-Jin ; Park, Hyungjun ;
Korean Journal of Computational Design and Engineering, volume 18, issue 4, 2013, Pages 275~282
DOI : 10.7315/CADCAM.2013.275
This paper proposes a method for human identification using teeth contours extracted from dental images that are captured from the frontal views of subjects each of who opens his or her mouth slightly. Each dental image has a black-colored region containing the subject`s teeth contours which are usually different from subject to subject. This means that this black-colored region has bio-mimetic information useful for human identification. The basic idea of the method is to extract the upper and lower teeth contours from the dental image of each subject and to encode their geometric patterns using a back-propagation neural network model. After acquiring 400 teeth images form 10 university students, we used 300 images for the training data of the neural network model and 100 images for its verification. Experimental results have shown that the proposed neural network-based method can be used as an alternative solution for identification among a small group of humans with a low cost and simple setup.
Dental Impression Measurement Based on an Adaptive Measuring Process Plan
Park, Sang Chul ; Chung, Yong Ho ; Hwam, Won Kyung ;
Korean Journal of Computational Design and Engineering, volume 18, issue 4, 2013, Pages 283~289
DOI : 10.7315/CADCAM.2013.283
Presented in this paper is an adaptive measuring procedure of dental impression using the Structured Light System. While measuring a complex object, such as dental impression, in the reverse engineering, it is not possible to acquire all parts of the scanned surface. Missing scanned data is resulted in holes in a created triangular mesh. The focus of this paper is to introduce an algorithm for automatic identification of additional scanning orientations to fill holes that are created by a default scan. The proposed algorithm was developed by the three major technological requirements: camera visibility, projector visibility, data reliability. In order to satisfy the requirements, the proposed algorithm determines additional scanning orientation from the orientation of a projection plane derived from the average normal vector of boundary triangles.
A Walking Movement System for Virtual Reality Navigation
Cha, Moohyun ; Han, Soonhung ; Huh, Youngcheol ;
Korean Journal of Computational Design and Engineering, volume 18, issue 4, 2013, Pages 290~298
DOI : 10.7315/CADCAM.2013.290
A walking navigation system (usually known as a locomotion interface) is an interactive platform which gives simulated walking sensation to users using sensed bipedal motion signals. This enables us to perform navigation tasks using only bipedal movement. Especially, it is useful for the certain VR task which emphasizes on physical human movement, or accompanies understanding of the size and complexity of building structures. In this work, we described system components of VR walking system and investigated several types of walking platform by literature survey. We adopted a MS Kinect depth sensor for the motion recognition and a treadmill which includes directional turning mechanism for the walking platform. Through the integration of these components with a VR navigation scenario, we developed a simple VR walking navigation system. Finally several technical issues were found during development process, and further research directions were suggested for the system improvement.
Requirement Analysis on Lightweight CAD Models in Ship PLM Environment and Its Application Examples
Cheon, Sanguk ; Lee, Ji-Hoon ; Park, Kwang-Phil ; Suh, Heung-Won ;
Korean Journal of Computational Design and Engineering, volume 18, issue 4, 2013, Pages 299~307
DOI : 10.7315/CADCAM.2013.299
Introduction of PLM in domestic shipyards is being retarded as ship PLM has yet to firm up return of investment and process integration. To implement a ship PLM system, it is required to share ship CAD model data in various design and manufacturing environments. Lightweight CAD models provide a promising solution for sharing CAD models in the product life cycle, which can expedite implementation of ship PLM in domestic shipyards in the near future. Compared to proprietary CAD models, it is easy for lightweight CAD models to be interfaced with various application systems and be connected to manufacturing information. In this paper, the reason why lightweight CAD models are necessary to implement a ship PLM system is addressed and current implementation results are introduced.