在經濟全球化趨勢下，現今企業多採取專業分工模式以維持核心競爭力，造成產品開發團隊可能分散於世界各地，協同設計被視為進行分散式產品開發的有效策略。本研究探討基於網路之協同設計中產品資訊的分享問題，發展創新的三維產品模型串流傳輸技術，以彌補現有資訊技術資料分享效率低落、對工程設計資訊支援不足、資料格式可攜性低與無法提供Peer-to-Peer傳輸等問題。主要是以「多層次產品模型」概念儲存產品設計之核心資訊，並根據協同角色指派各參與者所能獲得的設計內容。在分享接收兩方僅需依開關面機制處理傳輸之幾何資料，不需複雜CAD運算即可達成三維產品模型之漸進式傳輸。以設計特徵為基將產品模型分割為多個資料封包，每次僅需傳輸給接收者其所不足的部分，減少傳輸資料量並避免重複傳遞。而此分割機制亦為自動式斷點續傳的運作基礎，降低因連線中斷之資料損失。本研究以軟體實作驗證提出之串流傳輸技術的可行性，依序以「主從式」與「點對點」兩種網路架構實現之。最後針對實際分散式協同設計需求，嘗詴兩種不同的延伸應用情境，分別為「單一產品資料分享給多個參與者」及「單一參與者由多方同時獲得產品資料」之最佳化。研究結果將大幅提高網路環境下分享三維產品模型之效率、安全性與實用性。

Due to the economics globalization, most companies now enhance their core competences by outsourcing less-competitive tasks. As a result, the team members of modern new product development are nowadays dispersed in different geographic locations. Collaborative design is considered an effective means to facilitate such distributed product development. This research investigates 3D product information sharing in network-based collaborative design. A novel 3D streaming technology is proposed to overcome the inefficiency of data sharing, lack of support in engineering design, low data interoperability, and no peer-to-peer product information exchange, which the current information technologies cannot provide. The main idea is to record 3D product model according to multiple levels of details and to control design content based on collaboration roles. Geometric data is processed with respect to the switch face(s) of individual design features. The receiver side can progressively obtain the data and render it in real-time, without the need of implementing complex CAD operations. A complete 3D model is decomposed into a series of data packets based on the design features grouped in user-specified LOD’s. Only the data packets that the receiver does not possess need to be transferred at each model transmission, thus reducing the data amount and improving the efficiency in the streaming process. The model decomposition also provides a working mechanism for automatic data recovery in network disconnection. Prototyping software systems are implemented to verify the feasibility and effectiveness of the proposed streaming technology. Two types of system structure “client-server” and “peer-to-peer” have been realized in the implementation. Finally, two application scenarios are realized to demonstrate the practicality on actual distributed collaborative design through optimization of: “one product model disseminated to all the collaborators” and “receipt of one product model concurrently from multiple collaborators”. The result shows that this work can significantly enhance the efficiency, security, and practicality in sharing of 3D product model in networked environment.

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