• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제15권6호
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• pp.454-458
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• 2009

가상 환경 표현의 기술은 실물의 정확한 표현보다는 화면 안에 잘 보일 수 있는 형태로 묘사되어 왔다. 컴퓨터 그래픽스 기술의 발전으로 다양한 분야에서 컴퓨터그래픽스 물체 표현의 활용이 증대함에 따라서 단지 가시화의 기능 뿐 아니라 정확한 측정 정보를 요구하는 응용이 늘고 있다. 본 논문에서는 가상세계에서 정확한 측정 정보를 제공할 수 있도록 물리적 단위 체계를 적용할 수 있는 방법을 제안한다. 본 논문에서의 물리적 단위 속성의 명세는 웹에서의 3D 구현 기술인 X3D를 기반으로 정의하였다. 물리적 속성 중에서 X3D 장면 내에서 물리적 길이 속성을 정의하는 노드의 구성에 대하여 기술하고, 길이 외의 질량, 시간, 온도 등과 같은 다양한 물리적 속성의 단위를 국제 단위체계인 SI 단위계 (International System of Units)를 기반으로 각 객체에 정의할 수 있는 방법에 대하여 기술한다.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2005년도 춘계학술대회 논문집
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• pp.77-80
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• 2005

In this paper we write to the result of measuring human body shape method-ibs-2000 for human body shape measurement. The size measurement units and measuring speed is very inportant to efficiency of human body shape measurement units. By polygonal mirror system, the size measurement units and measuring time can be retrench.

• 건축역사연구
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• 제25권4호
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• pp.65-73
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• 2016

This paper aimed to identify the units of measuring scale in Hwangnyongsa temple planning with the published excavation survey reports. Hwangyongsa temple site was planned under Silla Capital's urban planning in 6~7C, its full size was $800{\times}800$, and main temple was $400{\times}515$ of Goguryeo's system of measurement. Main hall was located in the center of Hwangnyongsa temple site, and its location could be seen that there was the arrangement of main temple divided into 3 : 2. Building plan measuring units proved to be 351~356mm and 294~ 296mm by analyzing measured data of remains. Lecture hall and Wooden pagoda were rebuilt by using the ancestors' units of measuring scale again and Bell hall was not planned by Tang's system of measurement in middle of 8C. In this respect, it would be important to have a deliberate attitude and lay down stereotypes on research of the units of measuring scale in ancient architecture.

• 한국수학교육학회지시리즈A:수학교육
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• 제62권4호
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• pp.457-471
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• 2023

측정은 초등 수학의 핵심 영역이지만 중요도에 비하여 측정 상황에서 단위에 대한 학생들의 이해는 충분하지 않은 것으로 보고되고 있다. 이에 본 연구는 길이 측정 상황에서 초등학교 저학년 학생의 단위 추론에 대한 수준을 분석하여 이를 바탕으로 측정 영역에서 단위 추론을 지도하기 위한 방안을 모색하고자 하였다. 이를 위하여 개방형 수직선을 활용하여 길이 측정 과제를 적용한 초등학교 2학년 학생들의 응답을 수집 및 분석하였다. 연구 결과, 초등학교 저학년 학생들의 단위 추론 수준은 단위화, 단위 반복, 단위 분할 정도에 따라 1단위 반복하기, 주어진 단위 반복하기, 단위 사이의 관계 알기, 단위 변환하기의 4개의 수준으로 나타났다. 가장 많은 분포를 보인 수준은 길이 측정을 위해 단위 사이의 관계를 인식하는 수준이었으며 각 수준을 대표하는 단위 추론에 대한 학생들의 수준별 특징과 사례를 제시하였다. 본 연구 결과를 토대로 초등학교 저학년 학생들의 단위 추론 수준에 맞는 지도 방안이 요구되며, 불완전한 단위 추론 능력을 가진 친구들을 위한 추가 지도나 맞춤형 중재물의 활용이 필요함을 논의하였다.

• 한국품질경영학회:학술대회논문집
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• 한국품질경영학회 1998년도 The 12th Asia Quality Management Symposium* Total Quality Management for Restoring Competitiveness
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• pp.345-352
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• 1998

Performance measurement is increasingly becoming a vital issue for promoting quality management within an organization. This research proposes a new performance measurement approach, called the Hierarchically Associated Performance Measurement, for the organizations which emphasize long term quality thrust through a balanced interface between the quality efforts of various units. The proposed approach is unique in that it considers relationships between internal quality activities and national quality award criteria and that it identifies and utilizes the quality responsibilities of functional units in order to encompass organizational roles in the evaluation process. The approach is illustrated via a numerical evaluation of a fictitious organization.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2009년도 추계학술대회
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• pp.649-657
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• 2009

The paper presents the measurement split split-plot models for saving the time and cost. The split split-plot designs developed are efficiently used to estimating the gauge R&R(Reproducibility & Repeatability) when the completely randomized design of all factors(such as high pressure and temperature) is expensive and time consuming. The models studied include three split split-plots considering the type of experimental units.

• Journal of Electrical Engineering and Technology
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• 제10권1호
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• pp.18-29
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• 2015

State Estimation (SE) is the basis of a variety of advanced applications used in most modern power systems. An SE problem formed with enough phasor measurement units (PMUs) data is simply a linear weighted least squares problem requiring no iterations. Thus, designing a minimum-cost placement of PMUs that guarantees observability of a power system becomes a worthy challenge. This paper proposes an equivalent integer linear programming method for substation-oriented optimal PMU placement (SOOPP). The proposed method uses an exhaustive search to determine a globally optimal solution representing the best PMU placement for that particular power system. To obtain a more comprehensive model, contingencies and the limitation of the number of PMU measurement channels are considered and embodied in the model as changes to the original constraints and as additional constraints. The proposed method is examined for applicability using the IEEE 14-bus, 118-bus and 300-bus test systems. The comparison between SOOPP results and results obtained by other methods reveals the excellence of SOOPP. Furthermore, practical large-scale power systems are also successfully analyzed using SOOPP.

• 아동학회지
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• 제25권1호
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• pp.13-29
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• 2004

In this study of strategies used by young children in solving rectangular covering tasks before they have been taught area measurement, 75 5-, 6-, and 7-year-old children were asked to solve 3 rectangular covering tasks with a moveable unit. Three different sized units (4 cm., 2 cm., and 1 cm. cardboard squares) were provided and the children were asked to work out how many would be needed to cover a drawn rectangle. The resulting 5 developmental levels include incomplete covering, incomplete arrangement, complete covering, estimating, and measuring. Children using more advanced strategies were able to find correct number of units. While the tendency among older children was to use more advanced strategies, even 5-year-olds had an intuitive understanding of rectangular area measurement.

• Journal of Electrical Engineering and Technology
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• 제10권2호
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• pp.474-486
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• 2015

This paper proposes a multi-objective optimal placement method of Phasor Measurement Units (PMUs) in large electric transmission systems. It is proposed for minimizing the number of PMUs for complete system observability and maximizing measurement redundancy of the buses, simultaneously. The measurement redundancy of the bus indicates that number of times a bus is able to monitor more than once by PMUs set. A high level of measurement redundancy can maximize the system observability and it is required for a reliable power system state estimation. Therefore, simultaneous optimizations of the two conflicting objectives are performed using a binary coded firefly algorithm. The complete observability of the power system is first prepared and then, single line loss contingency condition is added to the main model. The practical measurement limitation of PMUs is also considered. The efficiency of the proposed method is validated on IEEE 14, 30, 57 and 118 bus test systems and a real and large- scale Polish 2383 bus system. The valuable approach of firefly algorithm is demonstrated in finding the optimal number of PMUs and their locations by comparing its performance with earlier works.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전력기술부문
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• pp.92-94
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• 2001

This paper investigated the real-time generator swing prediction by some researchers. And the first swing stability assessment based on EAC(Equal-Area Criterion) by using phasor measurement unit is proposed. Also we proposed the multi-swing prediction techniques, which is to estimate system parameters by using least square method / extrapolation with phasor measurement units. And the multi-swing prediction is performed with the estimated parameters. Future works are necessary to verify the proposed approaches in this paper.