• 한국CDE학회논문집
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• 제17권5호
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• pp.364-374
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• 2012

In this paper, we proposed a data structure to represent structural components of solid rocket motors (SRM) in an automated design program. To propose the data structure, we searched the necessary functions for the automated design program should have. In order to design the structural components of solid rocket motors sufficiently with a design program, it should have the functions to represent the shapes of the components, the drawing and analysis models, the design variables, various product structures, interferences, characteristic properties, design equations, and tightening sets. By modifying the data structure of an element object that is a general purpose data structure to represent a general component of a product, a new data structure was proposed to satisfy all the necessary functions with optimum. Finally, a design program for the structural components of solid rocket motors was developed successfully with the proposed data structure.

• Communications for Statistical Applications and Methods
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• 제25권3호
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• pp.275-282
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• 2018

This paper discusses the use of projections for the sums of squares in the analyses of variance for two-way nested design data. The model for this data is assumed to only have random effects. Two different sizes of experimental units are required for a given experimental situation, since nesting is assumed to occur both in the treatment structure and in the design structure. So, variance components are coming from the sources of random effects of treatment factors and error terms in different sizes of experimental units. The model for this type of experimental situation is a random effects model with more than one error terms and therefore estimation of variance components are concerned. A projection method is used for the calculation of sums of squares due to random components. Squared distances of projections instead of using the usual reductions in sums of squares that show how to use projections to estimate the variance components associated with the random components in the assumed model. Expectations of quadratic forms are obtained by the Hartley's synthesis as a means of calculation.

• ETRI Journal
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• 제39권1호
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• pp.62-68
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• 2017

In this paper, we present the design and characterization analysis of a cascode GaN field-effect transistor (FET) for switching power conversion systems. To enable normally-off operation, a cascode GaN FET employs a low breakdown voltage (BV) enhancement-mode Si metal-oxide-semiconductor FET and a high-BV depletion-mode (D-mode) GaN FET. This paper demonstrates a normally-on D-mode GaN FET with high power density and high switching frequency, and presents a theoretical analysis of a hybrid cascode GaN FET design. A TO-254 packaged FET provides a drain current of 6.04 A at a drain voltage of 2 V, a BV of 520 V at a drain leakage current of $250{\mu}A$, and an on-resistance of $331m{\Omega}$. Finally, a boost converter is used to evaluate the performance of the cascode GaN FET in power conversion applications.

• 디지털융복합연구
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• 제18권5호
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• pp.417-423
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• 2020

본 연구는 안드로이드의 구글 머티리얼 가이드를 중심으로 애플리케이션의 인터페이스 디자인을 구성하는 요소들에 관하여 연구하고, 형태 및 조합 방식에 따라 분류하여 UI 디자인 가이드 제작하는 방식을 제안하는 데 목적이 있다. 우선 머티리얼 디자인 가이드라인이 제공하고 있는 컴포넌트들을 분해하여 구성 요소들에 대해 분석하고, 형태 및 속성에 따라 구분하여 유형을 나눈 뒤 각각의 특성에 대하여 조사하였다. UI 디자인의 최소 구성 요소로는 표면, 글자, 아이콘, 미디어가 있고 이러한 요소들은 컴포넌트 적용 사례를 수집하여 공통 규칙을 수립하는 방식으로 가이드를 제작하는 것이 효율적이다. 컴포넌트는 목적에 따라 정보 탐색과 알림, 콘텐츠 전달로 분류할 수 있었는데 속성 및 고려해야 할 점이 달라 각각에 맞는 제작 방식을 연구하였다. 이러한 결과는 모바일 애플리케이션의 인터페이스 디자인을 구성하는 데 있어서 효율적 가이드를 제공하는 데 의의가 있으며, 머티리얼 디자인을 바탕으로 하는 UI 디자인의 지침이 될 것으로 기대한다.

• 품질경영학회지
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• 제48권2호
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• pp.269-282
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• 2020

Purpose: The practical design for experiments with mixtures of q components is consisted in the four types of design points, vertex, center of edge, axial, and center points in a (q-1)-dimensional simplex space. We propose a sequential method for the successful construction of the design space in Quality by Design (QbD) by allowing the different number of replicates at the four types of design points in the practical design when the quadratic canonical polynomial model is assumed. Methods: To compare the mixture designs efficiency, fraction of design space (FDS) plot is used. We search for the practical mixture designs whose the minimal half-width of the tolerance interval per a standard deviation, which is denoted as d₂, is less than 4.5 at 0.8 fraction of the design space. They are found by adding the different number of replicates at the four types of the design points in the practical design. Results: The practical efficient mixture designs for the number of components between three and five are listed. The sequential method to establish a design space is illustrated with the two examples based on the simulated data. Conclusion: The designs with the center of edge points replications are more efficient than those with the vertex points replication. We propose the sample size of at least 23 for three components, 28 for four components, and 33 for the five components based on the list of efficient mixture designs.

• 한국지진공학회논문집
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• 제26권3호
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• pp.127-136
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• 2022

Recently, an unprecedented emerging infectious disease has rapidly spread, causing a global shortage of wards. Although various temporary beds have appeared, the supply of wards specializing in infectious diseases is required. Negative pressure isolation wards should maintain their function even after an earthquake. However, the current seismic design standards do not guarantee the negative pressure isolation wards' operational (OP) performance level. For this reason, some are not included in the design target even though they are non-structural elements that require seismic design. Also, the details of non-structural elements are usually determined during the construction phase. It is often necessary to complete the stability review and reinforcement design for non-structural elements within a short period. Against this background, enhanced performance objectives were set to guarantee the OP non-structural performance level, and a computerized tool was developed to quickly perform the seismic design of non-structural elements in the negative pressure isolation wards. This study created a spreadsheet-based computer tool that reflects the components, installation spacing, and design procedures of non-structural elements. Seismic performance review and design of the example non-structural elements were conducted using the computerized tool. The strength of some components was not sufficient, and it was reinforced. As a result, the time and effort required for strength evaluation, displacement evaluation, and reinforcement design were reduced through computerized tools.

• ETRI Journal
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• 제35권4호
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• pp.559-565
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• 2013

In this work, we develop a simulation method to predict a two-dimensional luminance distribution method using a circuitry simulation. Based on the simulation results, we successfully fabricate large area ($90mm{\times}90mm$) transparent organic light-emitting diode panels with high luminance uniformity.

• 디자인융복합연구
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• 제16권4호
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• pp.81-98
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• 2017

이 연구는 프리저브드 플라워 패키지 디자인의 효율적 전개 여부를 평가하기 위해 조형 요소 뿐 아니라 제품 속성을 파악하여 접근하는 방향이 전제되어야 한다는 판단에서 시작되었다. 선행 연구를 기반으로 패키지 디자인의 구성 요건을 재정립하고, 제품 유형 분류 모형을 제안하였다. 패키지 디자인의 구성 원리는 6가지로 사용성, 심미성, 주목성, 독창성, 정체성, 상징성이며, 구성 요소는 크게 4가지 형태, 재질, 색상, 그래픽, 브랜드로 분류하였다. 제품 유형은 제품 정보 측면에서의 위험 지각과 제품 효익 측면에서의 사고 유형을 축으로 하여 4개 영역으로 구분하였다. 제품 유형 모형 영역별 대표 제품을 사례로 들어 패키지 디자인 구성 요소에서 발견되는 특징을 분석하여, 제품 유형에 따라 어떻게 디자인이 적용되어야 효과적이고 효율적인가에 대해 검토하였다. 이 모형에 대입해 프리저브드 플라워 패키지 디자인 전략적 방향성을 도출하였다. 최종적으로 연구용역으로 진행되어 제안된 평택시 프리저브드 플라워 브랜드 '프리저빌'의 패키지를 분석하여 한계점을 찾아보고 프리저브드 플라워라는 제품이 지향해야하는 패키지 디자인 관점을 제언하였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1988년도 한국자동제어학술회의논문집(국내학술편); 한국전력공사연수원, 서울; 21-22 Oct. 1988
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• pp.546-551
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• 1988

In design of the plastic injection mold, Almostdatas for the mold are decided During the assembly design. In this study, the designer will be able to carry out not only components design but also creation of machining data automatically, by the assembly data.

• 한국멀티미디어학회논문지
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• 제24권9호
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• pp.1299-1310
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• 2021

Under the background of the rapid development of digital educational games, we have to evidently research the elements of the achievement system of children's DEG (Digital Educational Game), and analyze the relations between the elements and make a profound study on the achievement system and its components on the impact of player's attitude. Compared with the existing research, the research contents and methods are innovative and reliable. The results show that players have a positive attitude towards the DEG achievement system, DEG achievement system has important value and role for educational games. Which is made of five elements: symbol, reward, logic, social interaction, and knowledge. The five elements interact with each other and have a positive impact on players' attitudes. DEG achievement system with five elements will bring players a positive experience. These findings provide a detailed study of the components of the achievement system. With all of these, we can explain the role and relationship of the components, and provide new ideas and empirical evidence for the design and development of children's educational game achievement system. The above findings provide a detailed description of the components of the DEG achievement system, explain the role and value of each component, and the relationships and patterns among the components, it provides a new perspective and empirical evidence for the design and development of the children's system DEG results.