• International Journal of Human Ecology
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• 제13권1호
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• pp.171-181
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• 2012

The effect of nutritional information on healthier menu choices have been reflected in previous research and nutrition policy efforts. This study further examines the relationship between healthy menu choices and three consumer characteristics - Future Orientation, Regulatory Focus, and Need for Cognition. A $3{\times}3$ experimental design was used with varying food types (burger sandwiches, sub sandwiches, and salad dressing) and the degree of nutritional information (no information, total calories only, and full nutrition information). It was found that having more nutritional information, and individuals with Future Orientation and Promotion Focus were associated with the choice of healthier menus. More specifically, those with high Consideration of Future Consequences and with Promotion Orientation switched their choices to the healthier ones with the provision of nutritional information.

• Journal of applied mathematics & informatics
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• 제29권3_4호
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• pp.813-829
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• 2011

In this article, we present a numerical scheme for solving singularly perturbed (i.e. highest -order derivative term multiplied by small parameter) Burgers-Huxley equation with appropriate initial and boundary conditions. Most of the traditional methods fail to capture the effect of layer behavior when small parameter tends to zero. The presence of perturbation parameter and nonlinearity in the problem leads to severe difficulties in the solution approximation. To overcome such difficulties the present numerical scheme is constructed. In construction of the numerical scheme, the first step is the dicretization of the time variable using forward difference formula with constant step length. Then, the resulting non linear singularly perturbed semidiscrete problem is linearized using quasi-linearization process. Finally, differential quadrature method is used for space discretization. The error estimate and convergence of the numerical scheme is discussed. A set of numerical experiment is carried out in support of the developed scheme.

• 한국영양학회:학술대회논문집
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• 한국영양학회 1995년도 춘계심포지움 및 학술발표논문 초록
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• pp.21-21
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• 1995

Absorption of fat-soluble vi tamin, retinol occurs mainly in the proximal part of small intestine. But its intestinal transport mechanism isn't yet clear. The aim of the present study was to investigate on the mechanism of absorption of retinol by determining a concentration-dependent kinetic of retinol absorption in rats. The study was carried out by applying in vivo technique in which vitamin solution was infused to intestinal lumen and at the same time thoracic duct and choledochus duct were canulated to collect samples. The investigations showed that retinol is absorbed in the small intestine by a saturable, carrier-mediated transport system, i.e. wi thout signi ficant differences between the proximal and distal halves of the small intestine. The transport of retinol taken up by the enterocytes occured via different mechanisms: while the main vitamin A transport via the thoracic duct was saturated by limiting transport factors such as retinol-CRBP-II-complex formation and retinol esterification with increasing substrate concentrations, the transport of retinol metabolite product via the portal vein was proportional to the substrate concentration.ration.

• 한국식품영양학회지
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• 제7권3호
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• pp.213-218
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• 1994

본 연구는 식품의 물성을 측정하기 위한 한 가지 방법으로 50 변위를 아주 정밀하게 직선적으로 측정이 가능한 linear proximity sensor(선형 근접 센서)를 활용하여 식빵의 굳기를 측정하였다 선형 근접 센서를 장착한 기구로 몇 가지 응력(0.376, 0.543, 0.769 kPa) 하에서 식빵의 온도와 수분 함량에 따른 변형을 컴퓨터 자동 자료 수집 장치를 통하여 on-line 상태로 매초마다 자료를 수집하여 컴퓨터 자료 분석 program으로 그래프를 얻었다. 식빵에 적용한 응력과 strain의 비율은 응력이 클수록 그 값이 커지는 비 선형 점 탄성체의 성질을 보였다. 이 측정 기구는 좁은 온도범위와 작은 수분함량의 차이에 따른 식빵의 굳기의 정도에 현저한 차이가 있음을 관찰할 수 있었다. 선형 근접 센서를 활용한 이 기구는 간단하면서도 정밀하게 동적으로 식품의 물성을 측정할 수 있었고, 높은 반복성을 나타내었다. 또한 수집된 자료는 점 탄성체의 특성을 설명하는 기계적인 모형으로 나타낼 수 있었다. Inokuchi의 방법을 적용하여 식빵의 물성을 모형화 하면 용수철과 완충 장치의 조합으로 나타내는 Burger's 모형에 잘 일치하였다. 본 측정 장치는 설치와 사용이 간단하여 식빵과 같은 연 식품의 물성을 측정하는데 활용이 용이하였다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1998년도 봄 학술발표회 논문집
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• pp.68-74
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• 1998

A finite element analysis for physical phenomenon which are governed by parabolic equation, has some inefficiencies caused by much computational time and large storage space. In this paper, a comparative study is performed to suggest the best efficient transient analysis algorithms for parabolic equations. First, the general finite element analysis techniques are summarized in views of formulation procedures, treatments of convection terms. and time stepping methods. Results of several combinations applied to one dimensional convection-diffusion equation and Burger equation are represented and compared using some criteria such as accuracy, stability, and computational time. Through the results, some guidelines to select a algorithm for solving parabolic equations are proposed for diffusion dominant and convection dominant cases. Finally applicability of two dimensional extension of the result is also discussed.

• 천문학회보
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• 제39권1호
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• pp.57.2-57.2
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• 2014

Protostellar jets and outflows are signatures of star formation and promising mechanisms for driving supersonic turbulence in molecular clouds. We quantify outflow-driven turbulence through three-dimensional numerical simulations using an isothermal version of the total variation diminishing code. We drive turbulence in real space using a simplified spherical outflow model, analyze the data through density probability distribution functions (PDFs), and investigate density and velocity power spectra. The real-space turbulence-driving method produces a negatively skewed density PDF possessing an enhanced tail on the low-density side. It deviates from the log-normal distributions typically obtained from Fourier-space turbulence driving at low densities, but can provide a good fit at high densities, particularly in terms of mass-weighted rather than volume-weighted density PDF. We find shallow density power-spectra of -1.2. It is attributed to spherical shocks of outflows themselves or shocks formed by the interaction of outflows. The total velocity power-spectrum is found to be -2.0, representative of the shock dominated Burger's turbulence model. Our density weighted velocity power spectrum is measured as -1.6, slightly less that the Kolmogorov scaling values found in previous works.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2020년도 제61차 동계학술대회논문집 28권1호
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• pp.289-290
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• 2020

본 논문에서는 Turtlebot burger3와 라즈베리파이의 OpenCV, OpenCR보드를 이용하여 ROS상에서 SLAM알고리즘을 구현하여 자율 주행 순찰이 가능한 로봇을 개발한다. 특히, 라즈베리파이 카메라에 OpenCV를 이용하여 사람 얼굴 인식이 가능하게 하여 순찰 시 카메라로 순찰 정보를 제공 할 수 있게 한다. 또한, 로봇에 탑재된 LiDAR는 SLAM 알고리즘을 이용하여 주변의 환경을 매핑하여 장애물을 회피할 수 있는 경로를 탐색할 수 있도록 한다. 개발 기술들을 통하여 사람 대신에 로봇이 경비 구역의 침입자 촬영을 하고, 원격제어가 가능한 시스템으로 다양한 분야에 로봇 제어 기술에 활용하고자 한다.

• Journal of Chest Surgery
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• 제29권10호
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• pp.1143-1147
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• 1996

최근들어 비디오 흉강경을 이용한 흉부수술은 다양한 흉부질환에 이용되고 있다. 전북대학교 의과대학 흉부외과학교실에서 1992년 8월부터 1995년 7훨까지 비디오 흉강경을 이용한 흉부수술을 46예 시행 하였다. 20명이 남자, 26명이 여자이었고 이들의 연령 분포는 14세에서 56세이었다. 대상질환은다한증 21예, 종격동 종양 12예, 기홍 10예, 식도의 평활근종 1예, 그리고 Raynaud's syndrome과 Burger's disease가 각각 1예씩이었다. 평균 수술시간은 89.7분이었고, 개흉술로 전환한 경우는 없었다. 사용한 트로카의 평균 숫자는 3개, 수술 후 흉관 거치 기간은 평균 1.8일, 그리고 수술 후 평균 입원 기간은 4.3일이 었다. 수술후 합병증은 5예(잔류기흉 1예, 횡격신경마비 1예, 지속적 공기 누출 2예, 대상성 과발한 1예)가 있었다. 지속적인 공기누출이 있었던 환자중 1예에서는 술후 3일째 개흉하여 폐부분절제술을 시행하였고 다른 1예에서는 술후 4일째 화학적 흉막유착술을 시행하여 공기 누출을 막을 수 있었다. 종격동 종양 절제술을 받은 환자중 1예에서는 조직검사상 흉선암으로 판명되어 6주간 5600cgy의 방사선 치료를 받 았다. 전체적으로 수술후 사망한 환자는 없었다. 흉강경을 이용한 흉부수술은 수술후 통증과 입원 기간을 감소시킬 수 있었고, 미용상의 이점이 있었다.

• Journal of Biosystems Engineering
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• 제42권2호
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• pp.104-111
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• 2017

Purpose: We have studied the necessary qualities of seedlings of some leafy vegetables for a riding-type two-row automatic transplanter. When seedlings are planted using a transplanter, long roots may be rounded in the bottom of the tray, and this can interfere with the separation of the seedlings. Uprightness related to leaf spread angle is an important quality for seedlings in mechanical planting. Methods: To select cultivars suitable for the transplanter, we compared varieties of Kimchi cabbage (Chukwang, Daetong, Whipalam and Namdo), head lettuce (Abi and Sensation), cabbage (YR Onnuri, YR Hogel, Harutama, and Ogane), and broccoli (Nicegreen and Earlyyou). To compare the effect of bed soil on root formation and growth, we used five types of soil: Chologi, Burger, Wonjomix, Bio, and Baroker with 2.6-3 L per tray. Growth increment and the degree of root formation were measured according to the RDA guidelines 25 days after sowing for Kimchi cabbage and head lettuce and 44 days after sowing for cabbage and broccoli. Conclusions: According to the plug tray, the optimum seedling age in both 128- and 200-hole trays was 28 days for Kimchi cabbage and 44 days for cabbage and broccoli. Head lettuce took 35 days in 128-hole trays and 31 days in 200-hole trays. Burger soil was most effective for root formation and growth of the four kinds of leafy vegetables; it appeared that smaller soil volume led to faster root formation.

• 대한방사선기술학회지:방사선기술과학
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• 제10권1호
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• pp.31-35
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• 1987

Authors have investigated actual conditions of 22 hospitals throughout the Seoul district to evaluate of chest radiographic systems. The results are as followed: 1. Concerning exposure factors, most hospitals have used low tube voltage, merely two hospitals high tube voltage, that is, over 120 kVp. Roughly halves of intensifying screens have been used in hospitals were medium speed screens, and the rests were high speed screens. 2, Surface doses existed within wide range of $10{\sim}63.5mR$, and image quality value were $5.60{\sim}7.49$. 3. The minimum perceptibility of Burger Phantom have been increased with contrast improvement.