• ETRI Journal
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• 제39권3호
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• pp.390-397
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• 2017

In this paper, we propose a scheme for designing a tunable pixel layer based on a $Ge_2Sb_2Te_5$ (GST) alloy thin film. We show that the phase change of GST can significantly affect the reflection characteristic when the GST film is embedded into a dielectric encapsulation layer. We investigate the appropriate positions of the GST film within the dielectric layer for high diffraction efficiency, and we prove that they are antinodes of Fabry-Perot resonance inside the dielectric layer. Using the proposed scheme, we can increase the diffraction efficiency by about ten times compared to a bare GST film pixel, and 80 times for the first-to-zeroth-order diffraction power ratio. We show that the proposed scheme can be designed alternatively for a broadband or wavelength-selective type by tuning the dielectric thickness, and we discuss a multi-phase example with a double-stack structure.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 춘계학술대회
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• pp.279-284
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• 2003

A nuclear power plant is composed of a number of primary components. Maintaining the integrity of these components is one of the most critical issues in nuclear industry. In order to maintain the integrity of these primary components, a complicated procedure is required including regular in-service inspection, failure assessment, fracture mechanics analysis, etc. Also, experts in different fields have to co-operate to resolve the integrity issues on the basis of inspection results. This integrity evaluation process usually takes long, and thus, is detrimental for the plant productivity. Therefore, an effective safety evaluation system is essential to manage the integrity issues on a nuclear power plant. In this paper, a web-based fatigue life evaluation system for primary components in nuclear power plant is proposed. This system provides engineering knowledge-based information and concurrent and collaborative working environment through internet, and thus, is expected to raise the efficiency of integrity evaluation procedures on primary components of a nuclear power plant.

• 한국추진공학회지
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• 제15권1호
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• pp.35-44
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• 2011

액체로켓엔진 시스템의 시동 및 정지 또는 추력 제어와 같은 천이 작동 시 동특성을 예측하기 위한 선행 연구로서 추진제 공급 시스템의 구성품에 대한 동특성 모델링을 수행하였다. 연료 공급 계통과 산화제 공급 계통의 구성품들은 재생냉각채널을 제외하고 같은 것으로 가정하였다. 동특성 모델링의 대상 구성품은 펌프, 관로, 오리피스, 제어 밸브, 재생냉각채널, 인젝터 등이며 실제 엔진 시스템의 축소 모형에 대한 수류시험을 통해 각 구성품의 동특성 모델링을 검증하였다. 수치적인 방법을 바탕으로 구성품에 대한 동특성 모델링을 통합하였으며 축소 모형으로 연결된 수류시스템을 사용한 수류시험을 통해 통합 동특성 예측프로그램을 검증하였다.

• Journal of Biosystems Engineering
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• 제26권1호
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• pp.11-20
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• 2001

Experiments under the stationary and harvesting condition, were performed in order to investigate the vibration characteristics of a head-feeding combine. 6 degrees of freedom components of acceleration at the location of the center of the gravity, and 3 degrees of freedom components of acceleration at the location of the operator seat were measured independently. The vibration characteristics of the combine were estimated with the power spectral density of the time series data of accelerations. From this research, the following results were obtained. 1. Vibration of a head-feeding combine under the stationary condition(engine, thresher and cutter are driven without harvesting) is mainly influenced by the engine. Further, 1/3, 1/2 (sub-harmonic) frequency components of the engine are observed besides engine driving frequency component(45Hz). 2. Vibration of a head-feeding combine under the harvesting condition is influenced by the engine, threshing unit and driving unit. Namely, some kinds of vibration frequency components in harvesting are observed compared with stationary condition. Further, sub-harmonic frequency components of the engine are observed besides engine driving frequency component as same as stationary condition. From these results, it may be concluded that vibration of a head-feeding combine is characteristics of semi-periodic and nonlinear vibration.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2008년도 춘계학술발표대회 논문집
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• pp.190-195
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• 2008

Aggressive behavior and the purchase of systematic marketing strategy and the marketing strategy is applied consistently integrated image management needs. However, domestic fashion brand shops selling space, the reality is reckless use of the design elements and an age, and despite a high level of sales, but consumers are not getting the environment will he provided. Teenie Winnie the characteristics of burial space and tim ENC literature, materials, research through the local environment, architectural design, the human aspect, the store environment, external components, the investigation focuses on internal components. Maketing aspects, VP, IP, PP josago to systematically on a colorful aspects of the comparative analysis would be linked up. Winnie the characteristics of burial space and tim ENC literature, materials, research through the local environment, architectural design, the human aspect, the store environment, external components, the investigation focuses on internal components. Maketing aspects, VP, IP, PP josago to systematically on a colorful aspects of the comparative analysis would be linked up. First, the design aspects of the human environment, architecture, environmental stores, external components, internal components can be divided into The brand image and concept of same-store environment of mutual relations in other stores. The interior is an important element in order to draw attention to consumer needs.

• 정보처리학회논문지D
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• 제9D권3호
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• pp.399-408
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• 2002

소프트웨어 위기를 극복하기 위하여 컴포넌트 기술이 제안되어 개발에 적용되고 있다. 소프트웨어 컴포넌트는 하드웨어의 집적회로와 같은 블랙박스로 취급되지만 사용자가 효과적으로 이해할 수 있도록 지원되지 않는다면 이용할 수가 없다. 이 논문은 하드웨어 컴포넌트의 이해를 돕기 위한 데이터 북 형식이 소프트웨어 컴포넌트를 표현하는데 잘 적용될 수 있다는 것을 보였다. 데이터 북의 내용으로 UML과 API모형을 도입하여 컴포넌트를 이해하는 접근 방법을 채택하였으며 소프트웨어 컴포넌트의 중요한 부분인 아키텍처와 인터페이스 부분을 추가하였다. 실증적인 실험을 위하여 제안한 데이터 북을 EJB의 배치 디스크립터에 확장 포함하여 컴포넌트 데이터북을 웹 브라우저에서 볼 수 있도록 하였고 그 효용성을 실험하였다.

• 한국물환경학회지
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• 제23권4호
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• pp.551-560
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• 2007

The present study analyzed noise reduction and long/short-term components for discharge, TOC concentration, and TOC load data in order to understand the data characteristics better. For the purpose, wavelet transform which can reduce noise from raw data and has flexible resolution in time and frequency domain was applied and the theory of nonlinear dynamics was also used to determine the last decomposition level for wavelet transform. Wavelet function of 'db10' and the 7th level for the last decomposition of wavelet transform were applied for the all data in the present study. Also the results revealed that the energy ratios of approximation components with 187-hour periodicity decomposed from 7th level of wavelet transform were 94.71% (discharge), 99.00% (TOC concentration), and 93.84% (TOC load), respectively. In addition, the energy ratios of detail components showed the range between 1.00% and 6.17%, which were extremely small comparing to the energy ratios of approximation components, therefore, the first and second detail components might be considered as noise components included in the raw data.

• 한국게임학회 논문지
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• 제21권5호
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• pp.63-74
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• 2021

게임 플레이 형식은 장르별로 게임 디자인 구성요소의 우선순위에 따라 크게 달라진다. 본 연구는 게임 장르별 게임 디자인 구성요소의 우선순위를 정량적으로 도출하기 위해 게임 디자인 구성요소와 장르에 대한 선행연구를 통해 6가지의 게임 디자인 구성요소와 6가지의 게임 장르를 추출한 후, 연구 모형을 설계하고, AHP를 통해 우선순위를 도출했다. 액션 게임에서 피드백 시스템과 메커닉스, 어드벤처 게임에서 스토리, 롤플레잉 게임에서 메커닉스와 스토리, 시뮬레이션 게임에서 메커닉스와 피드백 시스템, 테이블 게임에서 피드백 시스템과 메커닉스, 퍼즐 게임에서 메커닉스와 피드백 시스템이 우선순위가 높게 나타났다.

• 분석과학
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• 제32권3호
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• pp.105-112
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• 2019

Fingerprints may be contaminated with ethanol solutions. In order to solve the case, the law enforcement agency may need to visualize the fingerprint from these samples, but the development method has not been studied. The paper with latent fingerprint was contaminated with ethanol solution and then the blurring of ridge detail was observed. As a result, when the copy paper was contaminated with ethanol solutions of less than 75 % (v/v), the amino acid components of latent fingerprint residue blurred but lipid components of latent fingerprint residue didn't blurred. On the other hand, when the paper was contaminated with ethanol solution of more than 80 % (v/v), the amino acid components of latent fingerprint didn't blurred but the lipid components of latent fingerprint blurred. Therefore, it is found that the paper contaminated with ethanol solutions of less than 75 % (v/v) should be treated by oil red O (ORO) enhancing lipid components, and the paper contaminated with ethanol solutions of 80 % (v/v) or more should be treated by 1,2-indandione/zinc (1,2-IND/Zn) enhancing amino acid components. The blurring of ridge detail was not observed when the fingerprints were deposited with fingers contaminated with ethanol solution. This fingerprints were treated with 1,2-IND/Zn or ORO to compare the latent fingerprint development ability, and using 1,2-IND/Zn was able to visualize the latent fingerprint more clearly than using ORO.

• 한국식품영양학회지
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• 제35권3호
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• pp.185-192
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• 2022

This study investigated the volatile flavor components of the essential oil from Chrysanthemum coronarium var. spatiosumBailey. The essential oil obtained from the aerial parts of the plant by the hydrodistillation extraction method was analyzed by gas chromatography and gas chromatography-mass spectrometry. One hundred and one (99.11%) volatile flavor components were identified in the essential oil from the Chrysanthemum coronarium var. spatiosum Bailey. The major compounds were hexanedioic acid, bis(2-ethylhexyl) ester (12.45%), 6.10.14-trimethyl-2-pentadecanone (7.94%), 1-(phenylethynyl)-1-cyclohexanol (6.34%), α-farnesene (5.55%), phytol (4.99%), and α-caryophyllene (4.39%). When the volatile flavor components of Chrysanthemum coronarium var. spatiosum Bailey were classified by functional group, the content was high in the order of hydrocarbons, alcohols, esters, ketones, aldehydes, and phthalides. Sesquiterpene hydrocarbons were the most common hydrocarbons, mainly due to α-farnesene and α-caryophyllene. Among the alcohols, the content of aliphatic alcohols was significantly higher, mainly due to 1-(phenylethnyl)-1-cyclohexanol (6.34%) and phytol (4.99%). The analysis of the volatile flavor components of Chrysanthemum coronarium var. spatiosum Bailey in this study will provide useful information to consumers when purchasing food and to industries using fragrance ingredients.