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장신우(S.W. Jang),Hongchhay Seng,최영(Y. Choi),조성욱(S.W. Cho),양상욱(S.W. Yang) (사)한국CDE학회 2012 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2012 No.2
Three-dimensional shape retrieval system allows designers to search previously designed similar design models from the engineering database, and therefore to save the time for designing similar parts. In this paper, we examine and compare currently available shape search methods for three-dimensional engineering models. Our goal is to select and combine existing shape search methods and to devise a innovative user interface to implement a commercially effective shape retrieval system in engineering domain. This paper reports preliminary results of our research. 3D shape searching service enables to design swiftly through the model data searching and modification of existing model to be designing. This study would like to support every data form which is used in the industry including mainstream CAD data form and standard date form such as STEP on shape comparison for 3D shape searching. Therefore, we are researching on searching service which conducts shape comparison using that can be mesh based data.
Classification of directional cognition EEG using deep learning
심희동,박현준,안장원,현예나,양석조 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Brain-Computer Interface(BCI) decodes human`s thoughts into machine commands using biological signals such as Electroencephalography(EEG). However, most high-performance BCI applications are based on reactive methods like SSVEP(Steady-State Visual Evoked Potential). These methods are not only counter-intuitive, but also requiring external stimulus. Since these problems are due to low-level of understanding on human cognitive processes, to solve these, biosignal-based understanding is essential. One of the most non-intuitively used in BCI system is directional information. Even though directional information is frequently used in BCI systems, it is still used in an indirect way. In this study, we designed cognitive tasks to elicit directional cognition from subjects while measuring EEG. To elicit directional cognition, subjects were stimulated in visual and auditory sounds such as directional arrows, words and sounds. These datasets were labeled with the stimulated directions. Deep learning based neural networks were trained to classify and compared the classification results with conventional methods. We believe that the results of this study will improve the understanding in directional cognition processes through electroencephalography.
모듈화 구조 모바일 하버의 구성을 위한 셔틀 모듈의 개념 설계에 관한 연구
조성욱(S.W. Cho),최영(Y. Choi),양상욱(S.W. Yang),김승욱(S.W. Kim),성문현(M.H. Seong),정창교(C.K. Jung),이건우(K.W. Lee) (사)한국CDE학회 2010 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2010 No.1
Mobile harbor system is a new concept of the system for harbor loading and unloading operation at open sea. This new concept is being developed as an alternative plan for harbor loading and unloading operations instead of expanding capacity of existing quay or new construction of quay. Lack of proper coastal lines for building new quays and increasing environmental concerns justify the open sea loading and unloading of containers to and from containerships. Current approaches, which are still in the stages of idea conception, are divided in two directions. The first is the idea of building a unified vessel that has cranes and container barge in a single unit. The second idea is separating crane vessel and container transport vessel as separate modules, thus called as modular mobile harbor system. This paper describes the issues related to the container transport vessel, which we call shuttle module, that is designed for receiving containers from the crane module, transporting container to the quay, and unloading at the quay. The reverse operations are considered in the design of the shuttle module as well. Important issues related to the design of shuttle module are discussed and initial concept design is proposed in the paper.
김정준(J.J. kim),양상욱(S.W.Yang),최영(Y.Choi) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
As hardware capabilities of mobile devices are being rapidly enhanced, applications based upon mobile devices are also being developed in wider areas. In this paper, a prototype mobile 3D viewer with the object identification through RFID system is presented. To visualize 3D engineering data such as CAD data, we need a process to compute triangulated data from boundary based surface like B-rep solid or trimmed surfaces. Since existing rendering engines on mobile devices do not provide triangulation capability, mobile 3D programs have focused only on an efficient handling with pre-tessellated geometry. We have developed a light and fast triangulation process based on constrained Delaunay triangulation suitable for mobile devices in the previous research. This triangulation software is used as a core for the mobile 3D viewer on a PDA with RFID system that may have potentially wide applications in many areas.