A novel simulation program with an integrated circuit emphasis（SPICE） model developed for trench-gate metal-oxide-semiconductor field-effect transistor（M OSFET）devices is proposed. The drift region resistance was ...A novel simulation program with an integrated circuit emphasis（SPICE） model developed for trench-gate metal-oxide-semiconductor field-effect transistor（M OSFET）devices is proposed. The drift region resistance was modeled according to the physical characteristics and the specific structure of the trench-gate MOSFET device. For the accurate simulation of dynamic characteristics, three important capacitances, gate-to-drain capacitance Cgd, gate-to-source capacitance Cgsand drain-to-source capacitance Cds, were modeled, respectively, in the proposed model. Furthermore,the self-heating effect, temperature effect and breakdown characteristic were taken into account; the self-heating model and breakdown model were built in the proposed model; and the temperature parameters of the model were revised. The proposed model is verified by experimental results, and the errors between measured data and simulation results of the novel model are less than 5%. Therefore, the model can give an accurate description for both the static and dynamic characteristics of the trench-gate MOSFET device.展开更多
A modified drain source current suitable for simulation program with integrated circuit emphasis （SPICE） simulations of SiC MESFETS is presented in this paper. Accurate modeling of SiC MESFET is achieved by introduc...A modified drain source current suitable for simulation program with integrated circuit emphasis （SPICE） simulations of SiC MESFETS is presented in this paper. Accurate modeling of SiC MESFET is achieved by introducing three parameters in Triquint＇s own model （TOM）. The model, which is single piece and continuously differentiable, is verified by measured direct current （DC） I-V curves and scattering parameters （up to 20 GHz）.展开更多
INTRODUCTION Although visual programming is being broadly implemented in other disciplines,it has only relatively recently become an important supplement to three-dimensional modeling programs in the architecture,engi...INTRODUCTION Although visual programming is being broadly implemented in other disciplines,it has only relatively recently become an important supplement to three-dimensional modeling programs in the architecture,engineering,and construction industry.Currently,Grasshopper in conjunction with Rhino is a leading example of a visual programming environment that is strongly supported by a user community that is developing additional functionality,but Grasshopper does not yet work directly with building information modeling(BIM)software.Dynamo is relatively new,but shows considerable promise in becoming a constructive tool to complement BIM,3D modeling,and analysis programs because it includes parametric geom-etries and works with Revit,a leading BIM software program.Three case studies are described:extensibility of Dynamo through the use of a building energy simu-lation package,controlling a virtual model’s response through light level sensors,and interactively updating shading components for a building facade based on solar angles.They demonstrate that one can work directly within building information models(BIM)using a visual programming language through updating component parameters.These case studies demonstrate the feasibility of a workflow for sustain-able design simulations that is different than that more commonly used--having a separation between design and analysis models and using a neutral file format exchange such as IFC or gbXML to transfer data.As visual programming languages are still a bit uncommon in the building industry,a short background is provided to place them within the tool set of other customizable tools that designers have been developing.展开更多
经天路图是基于三维GIS系统的公路综合设计平台,为了使用户在该软件的使用过程中,准确表达设计理念和思想,需要开发在三维地球场景下的精确绘制图形功能。本文基于中科图新LocaSpaceSDK开发工具包,,使用C#语言在Visual Studio 2019平台...经天路图是基于三维GIS系统的公路综合设计平台,为了使用户在该软件的使用过程中,准确表达设计理念和思想,需要开发在三维地球场景下的精确绘制图形功能。本文基于中科图新LocaSpaceSDK开发工具包,,使用C#语言在Visual Studio 2019平台上开发了基础图元(点、线、多段线、圆、圆弧)绘制功能、特殊点(端点、图元之间的交点、垂足等)捕捉以及正交绘图、延长线追踪等辅助绘图功能。本文介绍了基础绘图功能的研发思路、工具、流程及关键算法,并展示了绘图功能的工程应用。结果表明,本文开发的基础绘图功能可以便捷、快速、准确地帮助用户表达设计理念和思路,提升设计效率。展开更多
Green buildings should respect nature and endeavor to mitigate harmful effects to the environment and occupants.This is often interpreted as creating sustain-able sites,consuming less energy and water,reusing material...Green buildings should respect nature and endeavor to mitigate harmful effects to the environment and occupants.This is often interpreted as creating sustain-able sites,consuming less energy and water,reusing materials,and providing excel-lent indoor environmental quality.Environmentally friendly buildings should also consider literally the impact that they have on birds,millions of them.A major factor in bird collisions with buildings is the choice of building materials.These choices are usually made by the architect who may not be aware of the issue or may be looking for guidance from certification programs such as LEED.As a proof of concept for an educational tool,we developed a software-assisted approach to characterize whether a proposed building design would earn a point for the LEED Pilot Credit 55:Avoiding Bird Collisions.Using the visual programming language Dynamo with the common building information modeling software Revit,we automated the assessment of designs.The approach depends on parameters that incorporate assessments of bird threat for façade materials,analyzes building geom-etry relative to materials,and processes user input on building operation to produce the assessment.展开更多
基金The National Natural Science Foundation of China(No.61604038)China Postdoctoral Science Foundation(No.2015M580376)+1 种基金the Natural Science Foundation of Jiangsu Province(No.BK20160691)Jiangsu Postdoctoral Science Foundation(No.1501010A)
文摘A novel simulation program with an integrated circuit emphasis（SPICE） model developed for trench-gate metal-oxide-semiconductor field-effect transistor（M OSFET）devices is proposed. The drift region resistance was modeled according to the physical characteristics and the specific structure of the trench-gate MOSFET device. For the accurate simulation of dynamic characteristics, three important capacitances, gate-to-drain capacitance Cgd, gate-to-source capacitance Cgsand drain-to-source capacitance Cds, were modeled, respectively, in the proposed model. Furthermore,the self-heating effect, temperature effect and breakdown characteristic were taken into account; the self-heating model and breakdown model were built in the proposed model; and the temperature parameters of the model were revised. The proposed model is verified by experimental results, and the errors between measured data and simulation results of the novel model are less than 5%. Therefore, the model can give an accurate description for both the static and dynamic characteristics of the trench-gate MOSFET device.
文摘A modified drain source current suitable for simulation program with integrated circuit emphasis （SPICE） simulations of SiC MESFETS is presented in this paper. Accurate modeling of SiC MESFET is achieved by introducing three parameters in Triquint＇s own model （TOM）. The model, which is single piece and continuously differentiable, is verified by measured direct current （DC） I-V curves and scattering parameters （up to 20 GHz）.
文摘INTRODUCTION Although visual programming is being broadly implemented in other disciplines,it has only relatively recently become an important supplement to three-dimensional modeling programs in the architecture,engineering,and construction industry.Currently,Grasshopper in conjunction with Rhino is a leading example of a visual programming environment that is strongly supported by a user community that is developing additional functionality,but Grasshopper does not yet work directly with building information modeling(BIM)software.Dynamo is relatively new,but shows considerable promise in becoming a constructive tool to complement BIM,3D modeling,and analysis programs because it includes parametric geom-etries and works with Revit,a leading BIM software program.Three case studies are described:extensibility of Dynamo through the use of a building energy simu-lation package,controlling a virtual model’s response through light level sensors,and interactively updating shading components for a building facade based on solar angles.They demonstrate that one can work directly within building information models(BIM)using a visual programming language through updating component parameters.These case studies demonstrate the feasibility of a workflow for sustain-able design simulations that is different than that more commonly used--having a separation between design and analysis models and using a neutral file format exchange such as IFC or gbXML to transfer data.As visual programming languages are still a bit uncommon in the building industry,a short background is provided to place them within the tool set of other customizable tools that designers have been developing.
文摘经天路图是基于三维GIS系统的公路综合设计平台,为了使用户在该软件的使用过程中,准确表达设计理念和思想,需要开发在三维地球场景下的精确绘制图形功能。本文基于中科图新LocaSpaceSDK开发工具包,,使用C#语言在Visual Studio 2019平台上开发了基础图元(点、线、多段线、圆、圆弧)绘制功能、特殊点(端点、图元之间的交点、垂足等)捕捉以及正交绘图、延长线追踪等辅助绘图功能。本文介绍了基础绘图功能的研发思路、工具、流程及关键算法,并展示了绘图功能的工程应用。结果表明,本文开发的基础绘图功能可以便捷、快速、准确地帮助用户表达设计理念和思路,提升设计效率。
文摘Green buildings should respect nature and endeavor to mitigate harmful effects to the environment and occupants.This is often interpreted as creating sustain-able sites,consuming less energy and water,reusing materials,and providing excel-lent indoor environmental quality.Environmentally friendly buildings should also consider literally the impact that they have on birds,millions of them.A major factor in bird collisions with buildings is the choice of building materials.These choices are usually made by the architect who may not be aware of the issue or may be looking for guidance from certification programs such as LEED.As a proof of concept for an educational tool,we developed a software-assisted approach to characterize whether a proposed building design would earn a point for the LEED Pilot Credit 55:Avoiding Bird Collisions.Using the visual programming language Dynamo with the common building information modeling software Revit,we automated the assessment of designs.The approach depends on parameters that incorporate assessments of bird threat for façade materials,analyzes building geom-etry relative to materials,and processes user input on building operation to produce the assessment.
