• Journal of Nutrition and Health
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• v.54 no.1
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• pp.23-38
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• 2021

Purpose: This study was undertaken to evaluate the health, nutritional status and metabolic syndrome risk according to the dietary pattern of adult single-person households, using information obtained from the Korea National Health and Nutrition Examination Survey (KNHANES). Methods: Data were collected from the 2013-2016 KNHANES, of adults aged 19-64 years, belonging to single-person households. Based on cluster analysis, the dietary patterns of subjects were classified into three groups. The dietary behavior factors, health-related factors, nutritional status, and prevalence of metabolic syndrome obtained from KNHANES questionnaires were compared according to the individual dietary pattern. The nutrient intake data of the subjects were calculated using the semi-food frequency questionnaire. Moreover, blood and physical measurement data of the subjects were analyzed to obtain the prevalence of metabolic syndromes. Results: The major dietary intakes of subjects were classified as 'Rice and kimchi', 'Mixed', and 'Milk·dairy products and fruits' patterns. Characteristics of subjects based on their dietary pattern, gender, age, and education level were significantly different. The 'Milk and fruits' pattern showed low frequency of skipping breakfast and eating out, and had higher intake of dietary supplements. Frequency of alcohol intake and smoking rates were highest in the 'Mixed' pattern. Maximum nutrient intake of fat, vitamin A, riboflavin, vitamin C, niacin, calcium, phosphorus, and potassium was obtained in the 'Milk·dairy products and fruits' pattern. According to dietary patterns adjusted for age and gender, the risk of metabolic syndrome was 0.380 times lower in the 'Milk·dairy products and fruit' pattern than in the 'Rice and kimchi' pattern. However, when adjusted for other confounding factors, no significant difference was obtained between dietary patterns for metabolic syndrome risk. Conclusion: These results indicate that the health and nutritional status of a single-person household is possibly affected by the dietary intake of subjects.

• Geophysics and Geophysical Exploration
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• v.20 no.4
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• pp.232-240
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• 2017

Normal moveout correction is one of the main procedures of seismic reflection data processing and a crucial pre-processing step for AVO analysis. Unfortunately, stretch phenomenon, which is the intrinsic problem of NMO correction, degrades the quality of stack section and reliability of AVO analysis. Although muting is applied to resolve this problem, it makes far-offset traces more useful to develop an advanced NMO correction technique without stretch. In this paper, easy and detailed explanations are provided on the definition and methodology of NMO correction, and then the cause of stretch is explained with its characteristics. A graphical explanation for NMO correction is given for the intuitive understanding of stretch phenomenon. Additionally, the theoretical formulation is derived to quantitatively understand the NMO correction. Through explaining the muting process to remove NMO stretch, the limitations of conventional methods are investigated and the need for a new resolution comes to discussion. We describe a stretch-free NMO correction based on inverse theory among many different stretch-free NMO corrections. Finally, the stretch-free NMO correction is verified through synthetic example and real data.

• 한국방재학회:학술대회논문집
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• 2009.02b
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• pp.124.1-124.1
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• 2009

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1996.06a
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• pp.712-715
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• 1996

• Journal of Bio-Environment Control
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• v.6 no.3
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• pp.133-142
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• 1997

Most of the greenhouses employ the roll-up type ventilation control system. Torque required to roll-up and down might be theoretically expressed with the weight times radius of the ventilation roll; however, measured torques were two times of the theoretically estimated values. As the window film of roll-up vent is used over the periods of time, the warping and crumpling of the material caused the increase of the torque in addition to a span deformation. Therefore, this study was performed to develop an empirical torque formulae to present basic torque data and to assist the development of roll-up type ventilation control system. The empirically adjusted rolling radius (r＋a) exponentially increased at the maximum span deformation. The coefficient of rolling resistance (Cr) was about 0.7―0.8 depending upon the wrinkle status of film material.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.1511-1514
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• 2006

본 연구에서는 현재 건설교통부에서 설치 및 운영 중에 있는 소형강우레이더의 최적화를 위해서 지상의 강우관측소 자료와 레이더 측정 자료의 실시간 보정방법을 이용하여 강우강도를 추정하였다. 본 연구에서 이용된 실시간 Z-R 관계식 적용으로 인한 강우강도 개선 정도를 파악하기 위해서 통상 일률적으로 적용되고 있는 $Z=200R^{1.6}$에 의한 강우강도 결과와 비교.분석하였으며, 지상의 강우관측소 실측 강우량과 비교함으로써 적용성을 보였다. 본 연구에서 이용된 보정방법은 강우보정에 소요되는 시간이 짧아 실시간 적용이 가능하며, 레이더 강우량의 정확한 추정으로 유역에서의 향상된 면적강우량 산출이 가능할 것으로 판단된다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.11 no.4
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• pp.197-200
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• 1999

An extension of the modified leap-frog scheme is made to solve the nonlinear shallow-water equations. In the extended model. the physical dispersion of the Boussinesq equations is replaced by the numerical dispersion resulted from the leap-frog finite difference scheme. The model is used to simulate propagations of a solitary wave over a constant water depth and a linearly varying water depth. Obtained numerical results are compared with available analytical and other numerical solutions. A reasonable agreement is observed.

• Proceedings of the KSRS Conference
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• 2007.03a
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• pp.311-314
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• 2007

다목적실용위성2호 영상자료의 절대복사 보정계수 산출을 위하여 위성 통과시각에 맞추어 2007년 2월 3일 현장실험을 수행하였다. 측정기기로는 Spectroradiometer GER-3700을 사용하였으며, 관측 Target은 아스팔트, 흙, 콘크리트, 잔디, Tarp 53%로 각 Target의 복사량을 측정한 후 지표면 반사도로 변환하였다. 현장에서 관측된 지표면 반사도를 복사전달모델 MODTRAN의 압력 자료로 사용하여 대기권 밖에서 관측될 복사량을 모의할 수 있었다. 마지막으로, 모의된 각 Target의 복사량과 실제 위성 센서가 관측한 DN(Digital Number) 값의 관계식을 이용하여 절대복사 보정계수를 산출하였다. 본 연구 결과는 센서의 반옹도가 반영되지 않은 임시 결과이며, 추후 보다 많은 현장실험 결과를 추가하여 정확한 절대복사 보정계수를 산출할 계획이다.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.625-628
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• 2008

Size-effect correction factors of the flexural test specimens, which had controled cement concrete pavement quality, were investigated and derived to be easily used in field. We couldn't find the size-effects in this size range (10, 12, 15cm) of specimens, which were made of 32mm crushed aggregates, and the theoretical verification was presented by Bazant's equations. Finally, non-dimensional chart for size-effect correction was proposed, covering the relationship between compressive strengths and w/c ratios.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.405-408
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• 2011

K-water(한국수자원공사)에서는 낙동강 수계내 레이더식 수위계를 15개를 설치 운영하고 있으며 부유물 및 이토발생의 우려가 없어 연차적으로 증설하고 있다. 레이더 수위계는 마이크로 웨이브파를 수면에 발사하여 반사된 전파 도달시간을 수위로 환산하는 방식의 기기로 표면이 얼어 있거나 수심이 낮을 경웨 자료가 불안정한 양상을 보이고 있어 수문학적으로 올바른 자료로 검보정이 필요하다. 본 연구에서는 칼만필터를 적용하여 송강수위국(임하댐 상류)의 자료를 검보정하고자 한다. 주위 관측소(청송 수위국) 1,2월 수위자료를 바탕으로 시스템모델을 선정하여 칼만필터에 적용하였으며 그 결과 동절기에 적합한 수위 변화로 검 보정 할 수 있었다. 이처럼 수위 자료에 다양한 방법을 적용함으로써 수위계 장비의 한계 및 현장여건에 따른 문제를 보완하여 더 정확한 자료를 획득할 수 있었다. 하지만 본 연구에 사용된 시스템 모델을 전 기간에 사용할 수 없는 한계가 있었다.