• 대한전자공학회논문지
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• 제24권3호
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• pp.425-432
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• 1987

The microprogram is the key technology of the implementation of the processor's control unit. But the coding and testing it is the most tedious process in the developing a new computer system. We developed the conversational micro architecture simulator(C-MAS) in order to use it as a microprogram development tool and a run time analyzer of the microprogram. We discuss the hardware description language(HDL) for a smulation, the design constraints of the C-MAS, and the user interface of it in this paper. We used the C language as the description language, and developed it on the berkeley UNIX4.2.

• 한국공간구조학회논문집
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• 제1권2호
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• pp.59-66
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• 2001

This paper describes three modules for development of the Space Frame Integrated Design System(SFIDS). The Control Module is implemented to control the developed system. The Model Generation Module based on PATRAN user interface enables users to generate a complicated finite element model for space frame structures. The Optimum Design Module base on a branch of combinatorial optimization techniques which can realize the optimization of a structure having a large number of members designs optimum members of a space frame after evaluating analysis results. The Control Module and the Model Generation Module Is implemented by PATRAN Command Language(PCL) while C++ language is used in the Optimum Design Module. The core of the system is PATRAN database, in which the Model Generation Module creates information of a finite element model. Then, PATRAN creates Input files needed for the analysis program from the information of the finite element model in the database, and in turn, imports output results of analysis program to the database. Finally, the Optimum Design Module processes member grouping of a space frame based on the output results, and performs optimal member selection of a space frame. This process is repeated until the desired optimum structural members are obtained.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 합동 추계학술대회 논문집 정보 및 제어부문
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• pp.284-287
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• 2001

In this paper, we designed and implemented a precise pulse motor control chip that generates the parabolic speed pattern. This chip can control step motor[1], DC servo[2] and AC servo motors at high speed and precisely. It can reduce the mechanical vibration to the minimum at the change point of a degree of acceleration. Because the parabolic speed pattern has the continuous acceleration change. In this paper, we present the pulse generation algorithm and the parabolic pattern speed generation. We verify these algorithm using visual C++. We designed this chip with VHDL(Very High Speed Integrated Circuit Hardware Description Language) and executed a logic simulation and synthesis using Synopsys synthesis tool. We executed the pre-layout simulation and post-layout simulation with Verilog-XL simulation tool. This chip was produced with 100 pins, PQFP package by 0.35 um CMOS process and implemented by completely digital logic. We developed the hardware test board and test program using visual C++. We verify the performance of this chip by driving the servo motor and the function by GUI(Graphic User Interface) environment.

• The Journal of Asian Finance, Economics and Business
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• 제8권3호
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• pp.1257-1266
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• 2021

The study examines factors that influence shopping intention of online consumers in Vietnam. Studied factors include consumers' attitude, subjective norms, perception of behavioral control, perception of usefulness, perceived risks and trust. The expansion of Theory of Planned Behavior (TPB) and Technology Acceptance Model (TAM) are used as basic theories. We have surveyed people who have experiences on online shopping. There are 836 selected questionnaires that are qualified for data processing. The collected data are analyzed through a process which starts from scale reliability test to exploratory factor analysis (EFA), correlation analysis and regression analysis. The results show that shopping intention of online consumers are positively affected by their attitude, subjective norms, perception of behavioral control, perception of usefulness and trust. In contrast, online shopping intention is negatively affected by the perceived risks that online shopping could bring. Among those factors, the perception of risk is shown to have the strongest influence to online shopping intention. The findings of this study suggest that managers and retailers can apply cash-on-delivery method and design their website with user-friendly interface to enhance online shopping intention of consumers. The Government is also recommended to fulfill the law system to reduce customers' perception of financial risks.

• 한국정보과학회논문지:소프트웨어및응용
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• 제33권9호
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• pp.751-775
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• 2006

본 논문에서는 아바타의 행위(Avatar Behavior)를 상위 레벨 명령어(High-Level Behavior)들로 이루어진 스크립트로 제어하는 기법을 제안한다. 아바타 행위를 추상화 정도에 따라 구분하고 이를 표준화된 계층적 스크립트(Layered Script)로 정의 함으로써 사용자는 스크립트를 재사용할 수 있고 행위의 추상화 조절이 가능하다. 또한 가상 환경이 복잡해짐에 따라 아바타 행위도 다양하게 늘어날 뿐 아니라 아바타-객체 상호작용 처리 역시 복잡해지고 있다. 이러한 문제점을 해결하기 위해 아바타와 객체간의 상호작용을 위한 객체 모델을 제안하여 아바타와 객체간 벌어지는 행위들을 객체 안에 분산시켜 표현함으로써 객체지향 방식으로 아바타 행위를 유연하게 제어할 수 있도록 설계하였다. 이를 위해 제안 객체 모델에서는 객체의 상태에 따라 사용 가능한 행위가 결정되는 컨텍스트 메뉴(context menu) 인터페이스와 동작 생성 모델을 정의하였다. 또한 사용자는 기존의 2D 혹은 텍스트기반 스크립트 작성기법을 벗어나 제안된 3D 인터페이스 기법을 통하여 실시간으로 아바타의 행위 스크립트를 작성 및 재생 할 수 있다. 본 연구에서는 제안 기법의 활용을 위해 프레젠테이션 도메인 환경의 시스템을 구축하고 아바타-객체 행위제어 및 스크립트 생성 기법을 적용하였다. 본 논문에서는 아바타의 행위(Avatar Behavior)를 일종의 상위 레벨 명령어(Hi8h-Level TaskBehavior)들로 이루어진 스크립트로 제어하는 기법을 제시한다제안한다. 아바타 행위를 추상화 정도에 따라 구분하고 이를 표준화된 계층적 스크립트(Multi-LeveiLayered Script)로 정의 함으로써 사용자는 쉽게 스크립트를 재사용할 수 있고 행위의 추상화 정도도 쉽게 조절이 가능하다. 또한 또한 아바타와 객체간의 상호작용을 위한 객체 모델을 제시한다. 가상 환경이 복잡해짐에 따라 아바타 행위도 다양하게 늘어날 뿐 아니라 아바타-객체 상호작용 처리 역시 복잡해지고 있다. 이러한 문제점을 해결하기 위해 아바타와 객체간의 상호작용을 위한 객체 모델을 제안하여 아바타와 객체간 벌어지는 모든 행위들을 객체 안에 분산시켜 저장표현함으로써 객체지향 방식으로 아바타 행위를 유연하게 제어객체의 수와 무관하게 상호작용을 처리할 수 있도록 설계하였다. 이를 위해 또한 복잡해진 제안 객체 모델에서는 객체의 상태에 따라 사용 가능한 행위가 결정되는 가상 환경을 위해 새로운 인터페이스로 컨텍스트 메뉴(context menu) 인터페이스와 동작 생성 모델을 제시한다. 정의하였다. 객체 모델에서 객체의 상태 정보와 행위 정보를 분석해 아바타가 할 수 있는 행위를 컨텍스트 메뉴로 제공하기 때문에 사용자는 가상 환경의 상태에 상관 없이 직관적으로 명령을 줄 수 있다. 또한 사용자는 기존의 2D 혹은 텍스트기반 스크립트 작성기법을 벗어나 사용자는 제안된 3D 인터페이스 기법을 통하여 실시간으로 아바타의 행위 스크립트를 작성 및 재생 할 수 있다. 본 논문에서 제시한 시스템은 기존의 아바타 중심적인 제어를 객체에 분산함으로써 효율적이고 직관적인 명령을 내릴 수 있고 또한 손쉬운 시나리오 생성을 가능하게 하였다. 본 연구에서는 제안 기법의 활용을 위해 프리젠테이션 도메인 환경의 시스템을 구축하고 아바타-객체 행위제어 및 스크립트 생성 기법을 적용하였다.

• Computers and Concrete
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• 제24권3호
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• pp.207-222
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• 2019

This paper has presented an effective and accurate meso-scale finite element model for simulating the fracture process of concrete under compression-shear loading. In the proposed model, concrete is parted into four important phases: aggregates, cement matrix, interfacial transition zone (ITZ), and the initial defects. Aggregate particles were modelled as randomly distributed polygons with a varying size according to the sieve curve developed by Fuller and Thompson. With regard to initial defects, only voids are considered. Cohesive elements with zero thickness are inserted into the initial mesh of cement matrix and along the interface between aggregate and cement matrix to simulate the cracking process of concrete. The constitutive model provided by ABAQUS is modified based on Wang's experiment and used to describe the failure behaviour of cohesive elements. User defined programs for aggregate delivery, cohesive element insertion and modified facture constitutive model are developed based on Python language, and embedded into the commercial FEM package ABAQUS. The effectiveness and accuracy of the proposed model are firstly identified by comparing the numerical results with the experimental ones, and then it is used to investigate the effect of meso-structure on the macro behavior of concrete. The shear strength of concrete under different pressures is also involved in this study, which could provide a reference for the macroscopic simulation of concrete component under shear force.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2004년도 춘계공동학술대회 논문집
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• pp.52-55
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• 2004

VMS (virtual manufacturing system) may be defined as a transparent interface/control mechanism to support human decision-making via simulation and monitoring of real operating situation through modeling of all activities in RMS (real manufacturing system). The three main layers in VMS are business process layer, manufacturing execution layer, and facility operation layer, and each layer is represented by a specific software system having its own input modeler module. The current version of these input modelers has been implemented based on its own 'local' framework, and as a result, there are no information sharing mechanism, nor a common user view among them. Proposed in this paper is a unified modeler framework covering the three VMS layers, in which the concept of PPR (product-process-resource) model is employed as a common semantics framework and a 2D graphic network model is used as a syntax framework. For this purpose, abstract class PPRObject and GraphicObject are defined and then a subclass is inherited from the abstract class for each application layer. This feature would make it easier to develop and maintain the individual software systems. For information sharing, XML is used as a common data format.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2006년도 춘계학술대회 논문집
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• pp.211-214
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• 2006

The outer race of the constant velocity(CV) joint is an important load-supporting automotive part, which transmits torque between the transmission and the wheel. The outer race is difficult to forge, because its shape is very complex and the required dimensional tolerances are very stringent. Therefore, the internet based shape inspection system is developed in this study to provide quick and accurate data through the easy control from users. Proposed system uses mechanical displacement sensors to measure the shape of CV joint that has six inner ball grooves, and commercially available Lab-View program is used to process measured data into the dimensional shape. Developed program provides a simple user interface that enables users real-time access of data measured from industrial production lines. Furthermore, it can exchange measured data via the internet between users and forging system operators. A java applet helped the system connection via internet. A data, IP access, is transmitted to the packet by TCP/IP. Our proposed system has many advantages over current measuring systems including fast and efficient data processing by real-time control, and system flexibility.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1998년도 추계학술대회
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• pp.127-128
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• 1998

It is necessary to maintain constant intravenous (IV) infusion rate. While infusion pump is able to control infusion rate with great accuracy, its rather large size and weight make it difficult for patients to move around. The most commonly used infusion device is gravity IV infusion set with its administration chamber being clamped according to the observed drip rate. In this case it may be easier and more accurate to maintain IV rate to given value if we automate the drip-counting process and tube-clamping work by electronic devices. We calculated volume infusion rate of specific fluid using optical drip rate meter which we had developed. To regulate fluid flow rate, we equipped the rate meter which we had developed with a miniaturized clamping apparatus using DC motor. Also, we Implemented drip detection and clamp control algorithm with PIC16C73 $\mu$-controller (Microchip). This system provides user interface through LCD display and key buttons.

• 조명전기설비학회논문지
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• 제13권1호
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• pp.69-76
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• 1999

본 논문에서는 도로 교통 정보설비의 유지관리를 위해 지능형으로 수행하는 원격감시제어 시스템을 제안하였다. 제안된 시스템은 국도 3호선에 설치되는 도로교통 설비에 대하여 유지관리를 수행하도록 시스템적으로 구축되어 있으며, 전송된 고장 정보는 중앙감시센터의 고장 정보 분석 알고리즘에 의해서 정보의 특성을 파악하도록 하였다. 분석 알고리즘은 신경회로망을 이용하여 다중으로 발생하는 고장정보에 대해서 지식 기반의 고장현상을 추론하도록 제안하였다. 고장 정보 분석 알고리즘의 유용성을 확인하기 위해 현장으로 실시간으로 전송되는 바이너리 신호의 패턴을 5가지 형태로 분류하여 성능을 분석하였으며, 이를 중앙감시센터에서의 유지관리용 운영환경 하에서 구현되도록 하였다.