• 대한지역사회영양학회지
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• 제12권5호
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• pp.534-544
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• 2007

This study was carried out to investigate the fast food consumption patterns classified by age in Busan. The survey was conducted from October 15 to November 15, 2006 by questionnaires and data analyzed by SPSS program. The results are summarized as follows: Forty one point five percent of the elementary group, 40.5% of the high school group, 24.1% of the 30's, 35.0% of the 40's and 18.1% of the 50's took fast foods over once a week. Seventy two point five percent of the elementary group, 61.5% of the high school group, 16.8% of the 30's group, 10.0% of the 40's, and 14.6% of the 50's preferred fast foods. There was a significant difference in the basis for selecting menus among the groups. The most important basis for selecting menus was 'price' in the elementary group and the high school group, but was 'preference' in the adult groups. As their age increased, they spend more money for fast food. Forty six percent of the elementary group and 49.5% of the high school group, 32.1% of the 30's, 36.5% of the 40's, 34.7% of the 50's thought that fast food can substitute for a meal. The age affected significantly the substitutability for the meal of the fast food (p < 0.001). In the high school group, the ratio of skipping breakfast is higher than in the other age groups. Dietary attitude has direct effects on the preference of the fast foods. Nutrition knowledge, degree of unbalanced diet and obesity rate have direct and indirect effects which were mediated by dietary attitude. Nutrition knowledge showed the greatest total causal effect in relation to the preference of the fast foods. Therefore, nutrition education for the subjects is needed to encourage them to choose more nutritious food and have healthier dietary pattern.

• Current Optics and Photonics
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• 제1권1호
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• pp.29-33
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• 2017

A method for analysis of thin film thickness in spectroscopic reflectometry is proposed. In spectroscopic reflectometry, there has been a trade-off between accuracy and computation speed using the conventional analysis algorithms. The trade-off originated from the nonlinearity of spectral reflectance with respect to film thickness. In this paper, the spectral phase is extracted from spectral reflectance, and the thickness of the film can be calculated by linear equations. By using the proposed method, film thickness can be measured very fast with high accuracy. The simulation result shows that the film thickness can be acquired with high accuracy. In the simulation, analysis error is lower than 0.01% in the thickness range from 100 nm to 4 um. The experiments also show good accuracy. Maximum error is under $40{\AA}$ in the thickness range $3,000-20,000{\AA}$. The experiments present that the proposed method is very fast. It takes only 2.6 s for volumetric thickness analysis of 640*480 pixels. The study suggests that the method can be a useful tool for the volumetric thickness measurement in display and semiconductor industries.

• 한국전산유체공학회지
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• 제17권4호
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• pp.41-48
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• 2012

A numerical analysis of thermal stratification in the upper plenum of the MONJU fast breeder reactor was performed. Calculations were performed for a 1/6 simplified model of the MONJU reactor using the commercial code, CFX-13. To better resolve the geometrically complex upper core structure of the MONJU reactor, the porous media approach was adopted for the simulation. First, a steady state solution was obtained and the transient solutions were then obtained for the turbine trip test conducted in December 1995. The time dependent inlet conditions for the mass flow rate and temperature were provided by JAEA. Good agreement with the experimental data was observed for steady state solution. The numerical solution of the transient analysis shows the formation of thermal stratification within the upper plenum of the reactor vessel during the turbine trip test. The temporal variations of temperature were predicted accurately by the present method in the initial rapid coastdown period (~300 seconds). However, transient numerical solutions show a faster thermal mixing than that observed in the experiment after the initial coastdown period. A nearly homogenization of the temperature field in the upper plenum is predicted after about 900 seconds, which is a much shorter-term thermal stratification than the experimental data indicates. This discrepancy is due to the shortcoming of the turbulence models available in the CFX-13 code for a natural convection flow with thermal stratification.

• 한국수자원학회논문집
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• 제36권5호
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• pp.715-724
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• 2003

이 연구의 목적은 사회간접자본의 대표적인 시설인 댐과 같이 기획, 조사, 타당성분석 단계에서부터 설계, 계약, 시공 및 유지관리단계까지 건설 생애주기가 긴 경우 Risk에 노출되는 시간 또한 길어져 건설기간 지연에 따른 비용증가는 물론 적기 미 준공시의 증액비용과 이용연기에 따른 편익손실로 국가 전체의 경쟁력을 저하시킴으로 이들 문제점을 감소시키는 방법을 모색하는 것이다. 이에 본 연구에서는 생애주기 각 단계별로 경제성분석을 통한 공기와 비용을 연계 분석하여 효율적이고 체계적인 사업수행단계 및 건설공정 Network모델을 도출하고 이 성과를 토대로 생애주기분석에 있어 Fast Track기법을 적용하는 하나의 새로운 방안으로 제안하고자 한다.

• 한국인터넷방송통신학회논문지
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• 제22권2호
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• pp.77-82
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• 2022

최근 고속 스토리지의 출현으로 메모리 시스템의 관리 단위인 페이지의 설정에 대한 재고가 필요한 시점에 이르렀다. 본 논문에서는 고속 스토리지의 탑재에 따라 페이지의 크기가 메모리 성능에 어떠한 영향을 미치는지를 분석하였다. 구체적으로는 데스크탑과 스마트폰 환경에서 페이지 크기에 따른 워크로드별 TLB 적중률 및 페이지 부재율을 분석하였다. 본 논문의 분석 결과 데스크탑 시스템에서는 페이지 크기의 영향력이 시스템 및 워크로드 상황에 의존적임을 확인하였다. 반면, 스마트폰 시스템의 경우 고속 스토리지가 탑재되더라도 페이지 크기가 메모리 성능에 미치는 영향이 크지 않으며, 워크로드에 따라서도 민감하지 않은 것을 확인하였다. 본 논문의 분석은 고속 스토리지 환경에서 페이지 크기를 시스템 및 워크로드 환경에 맞게 최적 설정하는 데에 도움을 줄 수 있을 것으로 기대된다.

• 한국수자원학회논문집
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• 제38권10호
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• pp.851-859
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• 2005

정규 상호 상관 (상관계수)은 입자영상유속계(PIV) 분석에서 형태 분석을 위한 가장 정확하고 적합한 척도이다. 그러나 상관계수는 주파수 영역에서 그에 상당하는 간단한 수식 표현이 없기 때문에, 빠르지만 부정확한 척도들이 종종 이용된다. 이러한 척도 중에서 선정된 세 가지 방법과 상관계수법을 상호 비교하였다. 그 결과 상관계수법을 제외한 나머지 척도들은 모두 종종 부정확한 결과를 도출함을 알 수 있었다. 그러나 상관계수법은 계산 시간이 많이 걸린다는 단점을 지니고 있다. 이 문제를 해결하기 위해, 상관계수법을 계산하는 빠르고 정확한 방법을 제시하였다. 이 방법은 상관계수의 분산을 계산하는 Fn 알고리듬과 분모를 계산하는 순차가감법을 결합한 것이다. 시험 결과 이 방법은 상관계수를 빠르고 정확하게 계산할 수 있음을 보였다.

• 감성과학
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• 제3권2호
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• pp.29-40
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• 2000

Autonomic and EEG responses were analyzed in 32 college students exposed to visual stimulation with Korean Affective Picture System (KAPS) and 36 students exposed to the International Affective Picture System (IAPS). Cardiac, electrodermal, and electrocortical measures were recorded during 30 sec of viewing affective pictures. The slides intended to elicit basic emotions (fear, anger, surprise, disgust, and sadness) were presented to subjects via Kodak slide-projector. The aim of the study was to differentiate autonomic and EEG responses associated with the same negative valence emotions elicited by KAPS and IAPS stimulation and to identify the influence of cultural relevance on physiological reactivity. The analysis of obtained results revealed significant differences in physiological responsiveness to emotionally negative valence slides from KAPS and IAPS. The typical response profile for all emotions elicited by the KAPS included HR acceleration (except surprise), and increase of electrodermal activity, slow and fast alpha blocking and fast beta power increase in EEG, which was not associated with significant asymmetry (except fast alpha in sadness). Stimulation with the IAPS evoked HR deceleration, specific electrodermal responses with relatively high tonic electrodermal activation, alpha-blocking and fast beta increase, and was accompanied also by theta power increase and marked frontal asymmetry (e.g., fast beta, theta asymmetries in sadness, fast alpha in fear). Physiological responses to fear and anger-eliciting slides from the IAPS were significantly less profound and were accompanied by autonomic and EEG changes more typical for attention rather than negative affect. Higher cardiovascular and electrodermal reactivity to fear emotion observed in the KAPS, e.g., as compared to data with the IAPS as stimuli, can be explained by cultural relevance and higher effectiveness of the KAPS in producing certain emotions such as fear in Koreans.

• 한국통신학회논문지
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• 제32권9C호
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• pp.834-839
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• 2007

The superimposed text in video brings important semantic clues into content analysis. In this paper, we present the new and fast superimposed text localization method in video segments. We detect the superimposed text by using temporal information contained in the video. To detect the superimposed text fast, we have minimized the candidate region of localizing superimposed texts by using the difference between consecutive frames. Experimental results are presented to demonstrate the good performance of the new superimposed text localization algorithm.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.343-346
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• 1998

In this paper a radiation problem for a finite microstrip antenna structure is analyzed. For the analysis of finite structures we utilize the equivalent volume current. Intergral equation for the unknown equivalent volume current induced on a finite microstrip structure is derived and solved by the use of conjugate gradient-fast fourier. transform (CG-FFT) method. Some numerical examples are radiation patterns derived by the equivalent volume current solved by the conjugate gradient-fast fourier transform.

• 천문학회지
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• 제34권1호
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• pp.1-8
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• 2001

We present a fast reduction method of survey data obtained using a single-dish radio telescope. Along with a brief review of classical method, a new method of identification and elimination of negative and positive bad channels are introduced using cloud identification code and several IRAF (Image Reduction and Analysis Facility) tasks relating statistics. Removing of several ripple patterns using Fourier Transform is also discussed. It is found that BACKGROUND task within IRAF is very efficient for fitting and subtraction of base-line with varying functions. Cloud identification method along with the possibility of its application for analysis of cloud structure is described, and future data reduction method is discussed.