• 제어로봇시스템학회논문지
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• 제5권1호
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• pp.115-121
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• 1999

Advanced digital computer technology enables the computer-based controllers to replace the traditional analog controllers used in factory automations. This replacement, however, brings up the side effects caused by the quantization error and non-real-time execution of control software. This paper describes the structure of real-time simulator and controller that can be used for design and verification of real-time digital controllers. The virtual machine concept adopted by the proposed real-time simulator makes the proposed simulator be independent from the specific hardware platforms. The proposed system can also be used in the loosely coupled distributed environments connected through local area network using real-time message passing algorithm and virtual data table based on the shared memory mechanism.

• 전자공학회논문지CI
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• 제38권6호
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• pp.1-17
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• 2001

시공간 데이터 모델은 공간과 시간 기능이 추가된 복합 객체를 기술하는 많은 응용 분야에서 이용될 수 있는 자료를 다룬다. 그러나 각 응용 분야를 위해 필요한 정보가 시공간 정보의 설계 단계에서 시간의 종류에 종속해서 지리정보가 다르게 표현될 수 있다. 이러한 다양한 필요성을 다루기 위해서는 지리정보를 시간 관점 하에서 기하학적 입장, 공간 관계 입장과 공간에 종속하는 속성의 입장으로 표현해야 한다. 이 논문에서는 지리정보시스템에 대한 객체들 사이의 관계와 속성에 대한 형식적 정의 문제를 제시하고 있다. 지리 자료는 지리-객체, 지리-필드로 분류되는데, 지리적 공간상에 존재하는 실제의 연속적이고, 이산적인 표현을 나타낸 것이다. 이 논문은 비지리-객체와 지리-객체 상에서 시간에 따른 속성의 변화와 관계 역할에 대해 연구하고자 한다. 따라서 이 연구결과는 지리-객체의 공간 클래스에 머문 기존 연구에 비지리-객체를 포함한 시공간 객체의 속성버전화 방법을 제안함으로써 시공간 객체 지향 클래스 설계상에서의 효율성에 기여한다.

• Journal of Magnetics
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• 제21권4호
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• pp.491-495
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• 2016

We developed an embedded Object-Oriented Micromagnetic Frame (OOMMF) script schemes for more flexible simulations for complex and dynamic mircomagnetic behaviors. The OOMMF can be called from any kind of softwares by system calls, and we can interact with OOMMF by updating the input files for next step from the output files of the previous step of OOMMF. In our scheme, we set initial inputs for OOMMF simulation first, and run OOMMF for ${\Delta}t$ by system calls from any kind of control programs. After executing the OOMMF during ${\Delta}t$, we can obtain magnetization configuration file, and we adjust input parameters, and call OOMMF again for another ${\Delta}t$ running. We showed one example by using scripting embedded OOMMF scheme, tunneling magneto-resistance dependent switching time. We showed the simulation of tunneling magneto-resistance dependent switching process with non-uniform current density using the proposed framework as an example.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제49권9호
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• pp.626-634
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• 2000

The paper describes a new and rigorous mathematical model using counter-EMF for the rotor field oriented system with induction motor which uses the estimated speed and rotor flux based on a Model Reference Adaptive System as well as the real-time approach. The estimated speed and rotor flux is used for the speed and flux feedback control. The stability and the convergence of the estimator are improved on the basis of hyperstability theory for non-linear systems. The validity of the proposed method is verified by simulation and also the sensorless control was tested on the propulsion system simulator used for the development of Korean High-Speed Railway Train(KHSRT).

• Interdisciplinary Bio Central
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• 제3권4호
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• pp.13.1-13.8
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• 2011

Previous research has established the existence of individual differences with regards to individuals' optimum time of well-functioning; specifically in terms of being either morning or evening oriented. An association has also emerged between being more evening, as opposed to morning, oriented and having a greater number of sexual partners. The aim of the present study was to investigate whether "eveningness" in males is an evolved sexually dimorphic trait consistent across different cultures. A sample of 179 male Sri Lankan men residing in two different cultural and economic settings, Italy and Sri Lanka, were administered the Morningness-Eveningness Questionnaire (MEQ) followed by assessing their sexual behavior history. The results robustly portrayed a highly significant main effect of MEQ types highlighting the twofold sexual success enjoyed by the evening individuals in both regional locations. Morning oriented individuals, showed a stronger preference for going out and partying than evening-types, suggesting that the higher mating success of evening types is not due to their different lifestyles allowing more opportunities to encounter females. However, evening types exhibited a preference for flirtatious behaviors in the later part of the day. Shoulder-to-hip and handgrip strength, as measures of testosterone levels, were not significantly associated with eveningness. The results are discussed in terms of sexual selection and its interplay with human cultural variation.

• 4차산업연구
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• 제1권2호
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• pp.17-20
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• 2021

Purpose - "Higher education of vocational education focuses on Discipline competition" This is the requirement of the education sector in China for the Application-oriented Undergraduate in the 21st century. As an integral part of Higher education vocational education, Discipline competition is not only an effective way to test the higher education reform of the Application-oriented Undergraduate, but also a measure of the level of Application-oriented Undergraduate. Research design, data, and methodology - The study conducted a survey on SPSS 24.0 Through factor analysis of 192 questionnaires data. After empirically analyzing the data, we found that the factors can be classified into four main factors. Result - This study shows that in terms of gender, boys are more susceptible to external factors and time factors while girls are more vulnerable to internal factors. And girls are more susceptible to internal factors. In terms of professional categories, non-teacher students are more likely to be hindered by external factors such as missing entry information. Conclusion - This paper assumes that there are significant differences in internal promotion and barriers in different disciplines competition.

• 한국실내디자인학회논문집
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• 제23권3호
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• pp.125-133
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• 2014

While shifting from modern society to post-industrial society, social structure is changing from the period which pursues material affluence to that which pursues psychological abundance. Formation of various values along with pursuit of psychological abundance has made the illusion of standardization, massification, and popularization meaningless. Different from functionality oriented approach in the past, today's design requires diversified, multiple and integrated thinking and way in fast-changing social phenomena and stream, and lets human loose from the restriction of time and space thanks to technological development. It appears as new and various attempts along with paradigm shift of the wholle society, however the existing physical and actual things gradually transit to non-physical and non-actual things. Tendency of dematerialization has spread as far as esthetic and environmental genre on the basis of social and philosophical base along with change of consumption culture, and has displayed complex and de-genre aspect. Paradigm shift has expanded the range of communication by changing to user's independent awareness and sensitive concept, among them, light displays various changes of space by taking the role of new medium. Particularly, the light as the media expression beyond the phenomenon of light of traditional concept acts as an essential element to stimulate sensitivity and for experience as an immaterial element which shows this change of space most dramatically. This research aimed at recognizing space in complex dimension, exploring the relation between the light and space through media expression displayed in the realization of immateriality, expanding the meaning of light, and recognizing it as the possibility of creative and future-oriented light space creation which responds to technological development and social change.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 추계학술대회
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• pp.580-581
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• 2021

스마트폰, 태블릿 등 모바일 기기에서 GPS 기술을 적용하는 다양한 위치-기반 서비스(Location-Based Service)가 있다. 본 논문에서는 코로나 19로 인해 비대면 서비스가 증가하는 현실에서 비대면 지향의 위치-기반 서비스 소프트웨어를 설계하였다. 제안한 모델은 물품 혹은 서비스를 거래하는 주체들이 거래를 위해 위치 정보를 파악하고, 실시간으로 확인된 정보를 활용한다. 제안된 스케줄링 및 우선순위 제어 알고리즘을 통해 효율적인 서비스 할당이 가능하며, 이를 검증하기 위해 웹/앱 기반으로 시뮬레이션을 수행하였다. 상용화된 플랫폼이 위치-기반 중고 물품 거래 중심인데 반해, 설계한 방법은 개인간 직거래가 아닌 비대면 서비스를 제공하고, 소상공인, 프랜차이즈 등 사용자에게 광범위한 거래 및 서비스를 제공한다는 점에서 차별성이 있다.

• 디지털융복합연구
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• 제15권7호
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• pp.191-199
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• 2017

본 연구는 취업 전 간호대학생에게 적용된 실무중심 교육프로그램이 신규간호사의 임상수행능력, 비판적 사고와 이직율에 미치는 영향을 확인하고자 하였다. 실무중심 교육프로그램에 참여한 후 해당 병원에 취업한 간호사 와 실무중심 교육프로그램에 참여하지 않고 해당 병원에 취업한 간호사를 대상으로 실시한 단일군 전후설계 및 비동등성 대조군 사후설계 연구이다. 연구결과 취업 전 실무중심 교육프로그램에 참여한 간호사의 임상수행능력과 비판적 사고는 높게 나타났으며, 실무중심 교육프로그램에 간호사의 입사 후 1개월 이내 이직율은 감소하였다. 병원 취업 전 간호대학생때부터 실무중심의 교육프로그램을 운영하는 것이 중요하며 신규 간호사의 인적자원관리를 위해서 새롭게 시도한 실무중심 교육프로그램은 학교에서 학생의 임상실습 교과과정 개발과 병원에서 간호사 교육프로그램 개발 시 유용하게 활용할 수 있을 것이다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 B
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• pp.1136-1139
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• 2000

The paper describes a new and rigorous mathematical model for the rotor field oriented system with induction motor which uses the estimated speed and rotor flux based on a Model Reference Adaptive System, as well as the real-time approach. The estimated speed and rotor flux is used for the speed and flux feedback control. The stability and the convergence of the estimator are improved on the basis of hyperstability theory for non-linear systems. The real-time controller and estimator are implemented with a sampling period of $926{\mu}s$ using a dual TMS320C44 floating-point digital signal processor. The validity of the proposed method is verified by simulation, and also, the sensorless control was tested on the propulsion system simulator, used for the development of Korean High-Speed Railway Train (KHSRT) [5].