• 한국항공우주학회지
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• 제39권5호
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• pp.442-450
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• 2011

회전 블레이드의 모션을 측정하기 위해 스테레오 패턴 인식 (stereo pattern recognition, SPR) 기법을 적용한 측정 시스템을 구성하고 실험을 수행하였다. 시스템 요구사항을 만족시키는 스테레오 카메라를 확보하여 SPR 기반의 측정 시스템을 준비하였다. 시스템의 측정불확도를 계산하기 위한 일련의 실험을 통해, 본 SPR 시스템이 2m~4.2m의 측정 거리에서 0.2mm 이내의 표준불확도를 가짐을 확인하였다. 이를 이용하여 계산한 블레이드 모션의 합성표준불확도는, 리드-래그, 플래핑, 비틀림 운동에 대해 각각 0.296mm, 0.209mm, $0.238^{\circ}$ 이었다. 본 SPR 시스템을 한국항공우주연구원의 소형로터 시험장치에 설치하고 회전속도와 콜렉티브 피치각을 각각 360rpm, 589rpm, 그리고 $0^{\circ}$, $4^{\circ}$, $6^{\circ}$로 바꾸어가며, 지상 제자리비행 조건에서 블레이드의 모션과 탄성 변형을 성공적으로 측정하였다. Higher Harmonic Control Aeroacoustic Rotor Test -II 에서 사용한 측정 시스템과의 비교를 통하여 본 시스템의 장점을 분석하였다.

• 패션비즈니스
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• 제16권1호
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• pp.103-120
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• 2012

The study aimed to evaluate the appearance of the men's work clothes jumpers developed to suggest the prototype work clothes jumper patterns by using the 3-D clothing simulation technology. The 3-D simulated clothing images considered the upper body features of men in the age range between 20 and 59 in South Korea. A questionnaire survey conducted previously suggested a basic jumper style with shirt collar and snap opening cuffs for the heavy industry workers; and discomforting parts of the work clothes jumper of the subject workers have been referred to for the experimental jumper appearance test. Besides, defining the measurements of men's upper bodies enabled to generate the men's 3-D virtual models representing each age group's average body feature. The significant body measurement factors for men's 3-D body modeling and jumper pattern-making were stature for the height factor; chest, waist and hip circumferences for the circumference factor; waist back, hip and arm lengths and interscye front/back for the length factor; and back neck breadth for the breadth factor and armscye and scye depths for the depth factor. The men's body measurements of 30's were implemented to three experimental jumper pattern-making methods, i.e. the 1st method using the relations based on stature and chest circumference; the 2nd method using the direct body measurements; and the 3rd method adopting the maximum ease amount of given body measurements whether relations or direct measurements except the direct measurement of scye depth. A comparison among the three experimental jumpers' simulated images highlighted that the appropriate ease amount of the jumper gained higher scores in terms of the jumpers' front, side, back and sleeve parts and the total silhouettes. Therefore the 3rd experimental jumper was finally selected for the heavy industry workers.

• 공업화학
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• 제18권1호
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• pp.71-76
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• 2007

수정진동자를 이용한 고분자의 상전이 현상의 해석에 있어서 중요한 인자라 할 수 있는 샘플의 극성 변화에 따른 공진저항의 변화 패턴을 설명하였다. 이를 위하여 친수성 물질로서 PVA (poly vinyl alcohol), 소수성 물질로서 PMMA/PVAc (poly methyl methacrylate/poly vinyl acetate)의 브랜딩 막을 수정진동자 전극 위에 코팅하여 사용하였다. 친수성 물질과 소수성 물질의 상호 비교에서 상전이와 연관하여 공진주파수 변화는 유사하게 나타났지만(같은 변화 Pattern), 공진저항은 서로 다른 변화의 형태로 관찰되었다. 이의 해석을 위하여 공진 파라미터 중의 커패시턴스($C_1$)와 수정진동자 금전극의 극성 등을 고려한 결과, 이러한 다양성이 타당하며, 재료의 극성에 따른 공진저항의 변화를 고려하여야만, 상전이 혹은 다양한 수정진동자 분석에 있어서 정확한 해석이 가능함을 설명하였다.

• 복식문화연구
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• 제16권3호
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• pp.461-474
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• 2008

The purpose of this study was to present a making method of jeans pattern with high fitness after deriving the appropriate shrinkage rate by material and washing process. Research Method of jeans pattern was presented after applying the optimized shrinkage rate. According to the result of the exterior evaluation of test jeans, all 6 jeans were rated high with scores close to 3.5. Following the evaluation of satisfaction of usage by physical movement, the highest ranking was in the order of walking with normal steps, back bending $90^{\circ}$, chair sitting, climbing stairs, and squatting. The shrinkage rate by physical area showed the highest score in the order of pants length, waist circumference, thigh circumference, knee circumference, hem circumference, hips circumference. In addition, the shrinkage rate was higher in warp direction than weft direction after washing finishing. As for the result of addition and reduction of pattern measurements by parts of jeans, waist circumference was $2.5{\sim}5.2cm$, hips circumference was $-1.8{\sim}2.8cm$, thigh circumference was $-1.3{\sim}2.0cm$ and knee circumference was $-1.0{\sim}1.7cm$. Also, hem circumference was $-1.0{\sim}1.8cm$ and pants length was $2.9{\sim}6.2cm$. That is, this results showed a wide range of addition and reduction according to material and washing finishing.

• Korean Chemical Engineering Research
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• 제46권5호
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• pp.983-987
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• 2008

IGCC 파일럿 플랜트의 집진시스템을 최적 설계하기 위하여 수치해석을 수행하였다. 서로 다른 가스 유입 방식이 집진용기 내부의 유체 유동장과 입자 거동에 미치는 영향을 분석하였다. 필터 표면에 전달되는 입자의 부하율은 분진입자가 혼합된 가스가 내부에 차단관이 설치된 집진용기의 외벽에 접하게 설치된 접선 유입구를 따라 집진용기 내로 유입되는 경우 아주 낮았으며, 입자크기가 클수록 입자부하율은 급격히 감소하였다. 이에 반하여, 가스 유동이 집진용기의 필터지지판 중앙에 수직하게 설치된 수직 유입구를 통하여 집진용기 내로 유입되는 경우, 필터 표면으로의 입자 부하율이 아주 높았으며, 입자크기 증가에 따른 입자부하율의 감소는 접선 유입 방식에 비하여 크지 않았다.

• 대한소아치과학회지
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• 제25권1호
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• pp.47-61
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• 1998

The purpose of this study was to compare the microleakage pattern of glass ionomer with resin restoration in microleakage pattern of primary and permanent teeth. Microscopical observation of interface between tooth structure and restoration was also performed. 80 and 8 sound molar teeth were used for the microleakage test and SEM study respectively. Data were analyzed statistically using ANOVA test and/or t-Test. The results of the present study were as follows: 1. According to the result of microleakage pattern between primary and permanent tooth, primary tooth generally showed more micro leakage than permanent tooth in all groups (p<.05). 2. In the resin-filled groups, occlusal margin was shown to have more microleakage than gingival margin(p<.05). Whereas the glass ionomer-filled groups showed no statistically significant differences between them(p>.05). 3. No statistically significant differences in microleakage could be found between two different resin groups(p>.05), while Fuji II LC group showed less microleakage than Ketac-Fil group(p>.05). 4. The various type hybrid layer was evident under SEM in resin-filled groups both in primary and permanent teeth with generally thicker layer in primary group. Among glass-ionomer group, Fuji II LC group showed more intact adhesion to tooth surface than Ketac-Fil group

• 디자인학연구
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• 제17권3호
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• pp.189-198
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• 2004

특정 웹사이트의 스타일은 그 사이트가 가지고 있는 성격을 사용자에게 가장 빠르고 정확하게 전달할 수 있는 중요한 방편이다. 또한 보다 효과적인 웹사이트의 구축을 위해서도 그 웹사이트가 대변하는 조직의 특성에 합당한 스타일의 구현은 상당히 중요한 디자인 요소로 볼 수 있다. 이러한 배경을 바탕으로, 본 연구에서는 웹 디자인의 효과적인 기획을 위한 하나의 방편으로서 적절한 스타일 방향을 모색하기 위한 방법 탐색에 관한 연구가 수행되었다. 이를 위해 인터넷 및 문헌연구를 통해 웹 디자인 스타일에 대한 고찰을 시도하였고, 이어서 국내외 여러 웹사이트들의 스타일 유형을 바탕으로 분석을 모색하였다. 또한 그 결과를 기반으로 웹디자인 스타일 유형과 사용자의 심상모델에 관한 설문 조사를 설계 및 수행하고 그 결과를 분석하였다. 금번 연구의 결과로는 일반적인 디자인과정의 스타일 결정과정 단계에서 광범위하게 활용될 수 있는 객관적인 방법의 한 예를 제시하였다는 데 있다. 이는 향후 여러 가지 디자인 분야에서 스타일의 결정 단계에서 본 연구에서 수행된 것과 유사한 방법을 적절히 활용하는 것에서 그 효용성을 찾을 수 있을 것이다.

• 농촌계획
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• 제26권3호
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• pp.91-102
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• 2020

The purpose of study was analyze the pumping characteristics, Irrigation Efficiency(IE), and irrigation pattern by period of rice growing stage with based on the performance of design irrigation water requirement and operational Galshin Pumping(GP) station in GP irrigation district constructed under rural water development project master plan. GP station was located in Yedang reservoir, Yesan-gun, Chungcheongnam-do and has been supplying irrigation water since 2006. The research data are the Irrigation Water Requirement(IWR) and the Pumping Water Amount(PWA) from 2006 to 2015 at the GP station, which is the supplied amount. The IWR were calculated using the Blaney-Criddle formula of the HOMWRS program, Hydrological Operation Model for Water Resource System, developed by Korea Rural Community Corporation. The Blaney-Criddle formula was used to calculate design irrigation water requirement of Galshin rural water development project master plan. During 2006-2015, the study period, the annual average IWR is 763.2(±149.1)mm, the annual PWA of the GP station is 397.4mm to 1,056.9mm, and those average annual PWA is 643.4(±208.4)mm. The annual IE of GP station 96.5% to 169.0%, and the average annual IE is 124.3%, which is higher than the research results conducted in other pumping stations. Analyzing the irrigation patterns of the GP irrigation district, the IWR Ratio per 10days(IWRR) and the PWA Ratio per 10days(PWAR) of the G P station were obtained. The IWRR is the percentage of IWR for each 10 days of a month to total IWR per year, and the PWAR is the percentage of PWA for each 10 days of a month to total PWA per year. The Kolmogorov- Smirnov(K-S) test results of IWRR and PWAR showed the characteristics classification by rice growing stage and stable normal distribution characteristics. Average IWRR(AIWRR) and Average PWAR(APWAR) are presented as irrigation patterns. Irrigation pattern analysis will be able to standardize comparison, analysis and probability calculation of the pumping station characteristics of different pumping stations and apply to objective evaluation of the pumping station district.

• 한국소음진동공학회논문집
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• 제24권11호
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• pp.907-918
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• 2014

In this study for the prediction of 3D underwater radiated noise pattern, a comparison between the proposed method(DHIE, Discrete Helmholtz Integral Equation) and the 3D underwater radiated noise calculation results using the measurement of near-field acoustic pressure data is performed. The near-field acoustic pressure in water is measured for the calculation of the far-field radiated noise pattern and the far-field acoustic power. Also the vibration field of the underwater structure is measured in simultaneously. Using the total far-field acoustic power and the vibration field on the surface of the structure, the proposed method(DHIE) can predict the underwater radiated noise pattern of the far-field The predicted results show the reasonable agreement within about 5dB comparing with the experiment result.

• 대한치과교정학회지
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• 제51권3호
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• pp.166-178
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• 2021

Objective: To investigate dimensional changes in regional pharyngeal airway spaces after premolar extraction in bimaxillary skeletal protrusion (BSP) patients according to vertical skeletal pattern, and to further identify dentoskeletal risk factors to predict posttreatment pharyngeal changes. Methods: Fifty-five adults showing BSP treated with microimplant anchorage after four premolar extractions were included in this retrospective study. The subjects were divided into two groups according to the mandibular plane steepness: hyperdivergent (Frankfort horizontal plane to mandibular plane [FH-MP] ≥ 30) and nonhyperdivergent groups (FH-MP < 30). The control group consisted of 20 untreated adults with skeletal Class I normodivergent pattern and favorable profile. Treatment changes in cephalometric variables were evaluated and compared. The association between posttreatment changes in the dentoskeletal and upper airway variables were analyzed using linear regression analysis. Results: The BSP patients showed no significant decrease in the pharyngeal dimensions to the lower level in comparison with controls, except for middle airway space (MAS, p < 0.01). The upper airway variable representing greater decrease in the hyperdivergent group than in the nonhyperdivergent group was the MAS (p < 0.01). Posttreatment changes in FH-MP had negative correlation with changes in MAS (β = -0.42, p < 0.01) and inferior airway space (β = -0.52, p < 0.01) as a result of multivariable regression analysis adjusted for sagittal skeletal relationship. Conclusions: Decreased pharyngeal dimensions after treatment in BSP patients showed no significant difference from the normal range of pharyngeal dimensions. However, the glossopharyngeal airway space may be susceptible to treatment when vertical dimension increased in hyperdivergent BSP patients.