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S-CODE: A Subdivision Based Coding System for CAD Models
Takarada, Yosuke,Takeuchi, Shingo,Kawano, Isao,Hotta, Jun,Suzuki, Hiromasa Society for Computational Design and Engineering 2003 International Journal of CAD/CAM Vol.3 No.1
A large scale polygon models are often used to approximately represent 3D CAD models in Digital Engineering environment such as DMU (Digital Mockups) and network based collaborative design. However, they are not suitable for distribution on the network and for interactive rendering. We introduce a new coding system based on subdivision schemes called S-CODE system. In this system, it is possible to highly compress the model with sufficient accuracy and to view the model efficiently in a level of detail (LOD) fashion. The method is based on subdivision surface fitting by which a subdivision surface and curves which approximate a face of a CAD model are generated. We also apply a subdivision method to analytic surfaces such as conical and cylindrical surfaces. A prototype system is developed and used for evaluation with reasonably complicated data. The results show that the method is useful as a CAD data coding system.
( Yasuhiro Takarada ),( Takeshi Ogawa ),( Weijia Dong ) 한국국제경제학회 2014 한국국제경제학회 동계학술대회 Vol.2014 No.1
Greenhouse gas emissions from international transport are increasing significantly because of the shifting of trade from proximate partners to distant partners under trade liberalization. We examine environmental regulations of international transport in a two-country, two-good general equilibrium model where international transport generates pollution, which is treated as a pure public bad. The main finding is that under a reasonable condition regarding the world demand for international transport, permit trading between the international transport sectors of two countries always benefits an international-transport-importing country but may harm an international-transport-exporting country even if it receives all of the direct gains from permit trading.
Evaluation of Micro EV's Spreading to Local Community by Multinomial Logit Model
Seki, Yoichi,Manrique, Luis C.,Amagai, Kenji,Takarada, Takayuki Korean Institute of Industrial Engineers 2012 Industrial Engineeering & Management Systems Vol.11 No.2
Micro Electric Vehicles are considered as a solution for reducing $CO_2$ emissions, however, it is difficult to evaluate its impact in a local community when it has been introduced. In this study, we evaluated how to spread the Micro EV within the community, using the utility derived from a multinomial logit model, and analyze the effect on $CO_2$ emissions. The householder's utility model is based on an investigation about Kiryu citizen's activities of shopping, transportation methods, etc. Using the geographic information system, we get the distances of each householder and the stores, and estimate a multinomial logit model about the combination choices of shopping stores and transportation method.
Evaluation of Micro EV’s Spreading to Local Community by Multinomial Logit Model
Yoichi Seki,Luis C. Manrique,Kenji Amagai,Takayuki Takarada 대한산업공학회 2012 Industrial Engineeering & Management Systems Vol.11 No.2
Micro Electric Vehicles are considered as a solution for reducing CO₂ emissions, however, it is difficult to evaluate its impact in a local community when it has been introduced. In this study, we evaluated how to spread the Micro EV within the community, using the utility derived from a multinomial logit model, and analyze the effect on CO₂ emissions. The householder’s utility model is based on an investigation about Kiryu citizen"s activities of shopping, transportation methods, etc. Using the geographic information system, we get the distances of each householder and the stores, and estimate a multinomial logit model about the combination choices of shopping stores and transportation method.