The adaptability of features definition to applications is an essential condition for implementing feature based design. This paper makes attempt to present a hierarchical definition structure of features. The propos...The adaptability of features definition to applications is an essential condition for implementing feature based design. This paper makes attempt to present a hierarchical definition structure of features. The proposed scheme divides feature definition into application level, form level and geometric level, and provides links between different levels with feature semantics interpretation and enhanced geometric face adjacent graph. respectively. The results not only enable feature definition to abate from the specific dependence and become more extensive, but also provide a theoretical foundation for establishing the concurrent feature based design process model.展开更多
In this paper, we conduct research on the definition and influence of new production of ship industry index of energy efficiency on the ship design process. Ship energy saving is the key to energy saving ship form opt...In this paper, we conduct research on the definition and influence of new production of ship industry index of energy efficiency on the ship design process. Ship energy saving is the key to energy saving ship form optimization design. In the ship under the conditions of use, and to optimize the design of the hull lines with boat, minimize the ship resistance, with the final choice of ship host fuel-sipping. Our research combine the characteristics of the energy efficiency with the shipbuilding industry with the novel and innovative design pattern which will be meaningful.展开更多
In this paper, we conduct research on the definition and influence of new production of ship industry index of energy efficiency on the ship design process. Ship energy saving is the key to energy saving ship form opt...In this paper, we conduct research on the definition and influence of new production of ship industry index of energy efficiency on the ship design process. Ship energy saving is the key to energy saving ship form optimization design. In the ship under the conditions of use, and to optimize the design of the hull lines with boat, minimize the ship resistance, with the final choice of ship host fuel-sipping. Our research combine the characteristics of the energy efficiency with the shipbuilding industry with the novel and innovative design pattern which will be meaningful.展开更多
Benefiting from advances in feature technology for design and manufacture can not be expected before a formal methodology is established. This paper makes attempt to establish a definition formalism of machining featu...Benefiting from advances in feature technology for design and manufacture can not be expected before a formal methodology is established. This paper makes attempt to establish a definition formalism of machining features in design for manufacturability from two aspects: formal definition and manufacturability analysis. Some definitions for machining feature based upon the selection and sequencing of material removal operations for component in accordance with the design geometry are presented and a framework of feature based design for manufacturability is outlined correspondingly. The proposed scheme contributes to several aspects of feature based CAD/CAM integration, especially to encourage potentially a more generic approach to the automation of design.展开更多
Extreme weather and climate events research needs concepts to analytically capture processes that describe how extreme they are: depth of impact but mainly also temporal aspects such as length, speed and quality of re...Extreme weather and climate events research needs concepts to analytically capture processes that describe how extreme they are: depth of impact but mainly also temporal aspects such as length, speed and quality of recovery. This paper analyses resilience as a concept to provide these dimensions. The use of the term resilience proliferates in many contexts and disciplines. Interpretations may overlap or even contradict each other. This paper seeks to make a case for a more nuanced understanding of resilience, including the use of “qualifier adjectives” to emphasize differences. Starting from the original etymological meaning of resilience as “bouncing back” the paper aims an innovative (re)conceptualization to facilitate the practical use of resilience in disaster risk management. It is recommended to distinguish between resilience as ability, being a hazard independent pre-disposition for recovery, and resilience as a process, describing different bouncing back and bouncing forward mechanisms inherent in the different recovery phases. This proposed distinction would enable the assessment of recovery abilities before calamities occur and hence could serve as guide to disaster preparedness programmes. The suggested analysis of resilience as a process would open opportunities to use the concept describing preemptive resilience response (presilience), recovery as bouncing back towards a state preceding the hazard event, as well as progressive resilience (prosilience) as bouncing forward and transition of the disaster recovery phase into adaptation and further development.展开更多
随着制造业的不断发展,铝合金箱体类零件在电子信息、仪器仪表、航空航天等领域得到了广泛的应用,复杂的结构和较高的性能要求给制造过程带来了诸多挑战。基于可制造性设计(design for manufacturing,DFM)技术,对铝合金箱体类零件的可...随着制造业的不断发展,铝合金箱体类零件在电子信息、仪器仪表、航空航天等领域得到了广泛的应用,复杂的结构和较高的性能要求给制造过程带来了诸多挑战。基于可制造性设计(design for manufacturing,DFM)技术,对铝合金箱体类零件的可制造性进行深入分析。通过阐述DFM的原理和方法,结合铝合金箱体类零件的特点,采用模型定义技术表征加工制造信息。根据企业自身制造和工艺水平构建工艺规则库,对产品三维模型进行可制造性分析。通过对设计模型的可制造性检查和校验,避免制造阶段产生不必要的设计和工艺更改,增强设计质量,降低设计成本,缩短产品研制周期。展开更多
This paper emphasizes the importance of defining processes rigorously, completely, clearly, and in detail in order to support the complex projects that are essential to the modern world. The paper argues that such pro...This paper emphasizes the importance of defining processes rigorously, completely, clearly, and in detail in order to support the complex projects that are essential to the modern world. The paper argues that such process definitions provide needed structure and context for the development of effective software systems. The centrality of process is argued by enumerating seven key ways in which processes and their definitions are expected to provide important benefits to society. The paper provides an example of a process formalism that makes good progress towards the difficult goal of being simultaneously rigorous, detailed, broad, and clear. Early experience suggests that these four key characteristics of this formalism do indeed seem to help it to support meeting the seven key benefits sought from process definitions. Additional research is suggested in order to gain more insights into needs in the area of process definition formalisms.展开更多
There are several classifications of foods that also include the level of their processing,with NOVA classification appearing to be the most adopted.However scientific consensus is still missing on how to define,chara...There are several classifications of foods that also include the level of their processing,with NOVA classification appearing to be the most adopted.However scientific consensus is still missing on how to define,characterize and classify food processing.The classifications are typically based on the health impacts of foods and do not fully include the engineering perspective of processing,i.e.,the application of physical,chemical,or biotechnological unit operations during food manufacturing,and the composition of a food product.This review offers an engineering perspective and definition of food processing,based on the change of mass and energy,allowing distinguishment of the impacts caused by food processing during the biomass transformation to food products.The improved understanding of the causes of undesired changes in food properties could be used for nutritional public policy recommendations and would contribute to combating some of the chronic diseases related to food consumption patterns.Proposed is the definition of“Food processing”as a sum of all intentional additions or removals of either edible matter or energy(except for any transport or for removal of inedible parts of food)between the harvest of ingredients and consumption of the product.展开更多
文摘The adaptability of features definition to applications is an essential condition for implementing feature based design. This paper makes attempt to present a hierarchical definition structure of features. The proposed scheme divides feature definition into application level, form level and geometric level, and provides links between different levels with feature semantics interpretation and enhanced geometric face adjacent graph. respectively. The results not only enable feature definition to abate from the specific dependence and become more extensive, but also provide a theoretical foundation for establishing the concurrent feature based design process model.
文摘In this paper, we conduct research on the definition and influence of new production of ship industry index of energy efficiency on the ship design process. Ship energy saving is the key to energy saving ship form optimization design. In the ship under the conditions of use, and to optimize the design of the hull lines with boat, minimize the ship resistance, with the final choice of ship host fuel-sipping. Our research combine the characteristics of the energy efficiency with the shipbuilding industry with the novel and innovative design pattern which will be meaningful.
文摘In this paper, we conduct research on the definition and influence of new production of ship industry index of energy efficiency on the ship design process. Ship energy saving is the key to energy saving ship form optimization design. In the ship under the conditions of use, and to optimize the design of the hull lines with boat, minimize the ship resistance, with the final choice of ship host fuel-sipping. Our research combine the characteristics of the energy efficiency with the shipbuilding industry with the novel and innovative design pattern which will be meaningful.
文摘Benefiting from advances in feature technology for design and manufacture can not be expected before a formal methodology is established. This paper makes attempt to establish a definition formalism of machining features in design for manufacturability from two aspects: formal definition and manufacturability analysis. Some definitions for machining feature based upon the selection and sequencing of material removal operations for component in accordance with the design geometry are presented and a framework of feature based design for manufacturability is outlined correspondingly. The proposed scheme contributes to several aspects of feature based CAD/CAM integration, especially to encourage potentially a more generic approach to the automation of design.
文摘Extreme weather and climate events research needs concepts to analytically capture processes that describe how extreme they are: depth of impact but mainly also temporal aspects such as length, speed and quality of recovery. This paper analyses resilience as a concept to provide these dimensions. The use of the term resilience proliferates in many contexts and disciplines. Interpretations may overlap or even contradict each other. This paper seeks to make a case for a more nuanced understanding of resilience, including the use of “qualifier adjectives” to emphasize differences. Starting from the original etymological meaning of resilience as “bouncing back” the paper aims an innovative (re)conceptualization to facilitate the practical use of resilience in disaster risk management. It is recommended to distinguish between resilience as ability, being a hazard independent pre-disposition for recovery, and resilience as a process, describing different bouncing back and bouncing forward mechanisms inherent in the different recovery phases. This proposed distinction would enable the assessment of recovery abilities before calamities occur and hence could serve as guide to disaster preparedness programmes. The suggested analysis of resilience as a process would open opportunities to use the concept describing preemptive resilience response (presilience), recovery as bouncing back towards a state preceding the hazard event, as well as progressive resilience (prosilience) as bouncing forward and transition of the disaster recovery phase into adaptation and further development.
文摘随着制造业的不断发展,铝合金箱体类零件在电子信息、仪器仪表、航空航天等领域得到了广泛的应用,复杂的结构和较高的性能要求给制造过程带来了诸多挑战。基于可制造性设计(design for manufacturing,DFM)技术,对铝合金箱体类零件的可制造性进行深入分析。通过阐述DFM的原理和方法,结合铝合金箱体类零件的特点,采用模型定义技术表征加工制造信息。根据企业自身制造和工艺水平构建工艺规则库,对产品三维模型进行可制造性分析。通过对设计模型的可制造性检查和校验,避免制造阶段产生不必要的设计和工艺更改,增强设计质量,降低设计成本,缩短产品研制周期。
基金supported by the US National Science Foundation under Award Nos. CCR-0427071, CCR-0204321 and CCR-0205575
文摘This paper emphasizes the importance of defining processes rigorously, completely, clearly, and in detail in order to support the complex projects that are essential to the modern world. The paper argues that such process definitions provide needed structure and context for the development of effective software systems. The centrality of process is argued by enumerating seven key ways in which processes and their definitions are expected to provide important benefits to society. The paper provides an example of a process formalism that makes good progress towards the difficult goal of being simultaneously rigorous, detailed, broad, and clear. Early experience suggests that these four key characteristics of this formalism do indeed seem to help it to support meeting the seven key benefits sought from process definitions. Additional research is suggested in order to gain more insights into needs in the area of process definition formalisms.
文摘There are several classifications of foods that also include the level of their processing,with NOVA classification appearing to be the most adopted.However scientific consensus is still missing on how to define,characterize and classify food processing.The classifications are typically based on the health impacts of foods and do not fully include the engineering perspective of processing,i.e.,the application of physical,chemical,or biotechnological unit operations during food manufacturing,and the composition of a food product.This review offers an engineering perspective and definition of food processing,based on the change of mass and energy,allowing distinguishment of the impacts caused by food processing during the biomass transformation to food products.The improved understanding of the causes of undesired changes in food properties could be used for nutritional public policy recommendations and would contribute to combating some of the chronic diseases related to food consumption patterns.Proposed is the definition of“Food processing”as a sum of all intentional additions or removals of either edible matter or energy(except for any transport or for removal of inedible parts of food)between the harvest of ingredients and consumption of the product.
