• The Journal of the Korea Contents Association
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• v.11 no.10
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• pp.342-348
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• 2011

The study aimed to compare the validity between the abdominal ultrasonographic(US) grading system of fatty liver and histologic grading system of fatty liver in living liver donor candidates. As the fatty liver is defined as pathologic total fat >10%, US validity was sensitivity 64.6%, specificity 68%, positive predictive value 76.8%, negative predictive value 54%. As the strict data handling on US grading normal, mild fatty liver are negative, moderate fatty liver is positive, US validity was sensitivity 26.8%, specificity 100%, positive predictive value 100%, negative predictive value 45.5%. ROC curve analysis according to different cut off value of liver-to-kidney brightness ratio was Area under ROC curve=0.859(95% CI=0.795~0.922, state variable= total fat 10%). There were statistically significant difference( p<0.001). Ultrasonography for the fatty diagnosis showed a high validity to predict the result of histology grade of fatty liver.

• Journal of the Korean Society of Food Science and Nutrition
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• v.35 no.4
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• pp.487-492
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• 2006

Acetylated rice starches were prepared by reaction of rice starch with acetic anhydride, and their physicochemical properties as a function of degree of substitution (DS) were evaluated. The percentage of acetyl group and DS were $0{\sim}2.71%\;and\;0{\sim}0.104$, respectively. DS increased with increase in acetic anhydride content. DS increased swelling power and solubility of rice starch. Light transmittance (%) values of acetylated rice starches were much higher than that of native rice starch and increased with increase in DS. Rapid Visco Analyzer initial pasting temperature of acetylated rice starches decreased with increase in DS, while peak viscosity and breakdown values increased. Starch gets showed a significant decrease in syneresis (%) with the increase in DS.

• Water for future
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• v.27 no.2
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• pp.97-109
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• 1994

Parameters for the Synthetic Unit Hydrograph(SUH) using SCS and v methods(including modified type) are derived by regression analysis of the Representative Unit Hydrograph(RUH) of 22 basins in Korea. These derived SUHs were compared with the RUHs and those of Snyder and HYMO given by the Korea Institute of Construction Technology (KICT) for selected 4 basins. In SCS method, when correlated with the lag time of SUHs based on the whole basin rather than on the riverwise basins the peak discharge(excluding Bocheng stream) is close to that of RUH. BUt the peak time given by riverwise basins agrees closer to the RUH than by the whole basins. The modified Nakayasu type SUH(excluding Wi stream) associated with lag time based on riverwise basins gives better agreements to the RUH than that of Nakayasu method. And the modified Nakayasu type SUH gives much better agreement to the RUH than that of Nakayasu method for the case of both whole and riverwise basins.

• Tunnel and Underground Space
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• v.24 no.4
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• pp.325-333
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• 2014

Hydraulic fracturing is the key technology for production of shale gas, which is one of the major unconventional resources. Brittleness index is one of the most important mechanical properties which determine the efficiency of hydraulic fracturing. It was required that the production of shale gas increases with more brittle behavior. Confusingly, there are numerous definitions available for brittleness of rock. This paper summarizes various definitions of brittleness index, and presents correlation analysis of the brittleness indices by using the laboratory experimental results of 48 shale specimens in Korea. Generally, it shows a very weak positive correlation between the brittleness index ($B_1$) which is the ratio of uniaxial compressive strength to tensile strength and the brittleness index ($B_3$) which is calculated by using the Youngs modulus and Poisson's ratio. In addition, the role of Poissons ratio is not clear in defining brittleness indices. In conclusion, standardization of definition for brittleness index is required to apply it to hydraulic fracturing as a parameter for predicting the efficiency.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2001.04a
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• pp.184-184
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• 2001

캘린더령은 지펼의 표면을 평활하게 하고, 두께를 감소시켜 균일하게 하는 역할을 한다. 그러나 이는 필연적으로 불투명도와 같은 광학적 성질과 인장강도 등의 강도적 성질 의 저하를 유발한다. 따라서 캘린더링 공정변수인 온도, 압력, 속도 등이 종이의 물성에 미 치는 영향을 정확하게 파악하는 것은 캘린더령에 따라 발생할 수 있는 물성 저하를 최소화 하기 위해 필수적으로 요청된다. 본 연구에서는 최근들어 저평량화에 대한 관심이 증가하면 서 그 중요성이 더해지고 있는 불투명도가 캘린더링에 따라 변화되는 양상을 분석하기 위해 서 화상분석 기법을 이용하여 종이의 두께방향 밀도 변이를 평가하고 밀도변이와 불투명도 와의 상관관계를 해석코자 하였다. 또 캘린더링에 따른 불투명도를 저하를 최소화시키기 위 한 캘린더링 조건을 모색하였다. 캘린더링에 의해 발생하는 종이의 두께 변형은 두께방향의 위치에 따라 다르게 나 타난다. 이러한 종이의 두께 방향으로 발생하는 밀도 변이와 이에 따른 불투명도 변화를 평 가하기 위하여 동일한 평량의 종이를 캘린더령 조건을 달리하여 두께방향 밀도변이가 다른 시편을 준비하고 두께 방향 단면을 SEM으로 촬영하였다. 이후 화상분석기를 통해 단면을 이치화하고, 각 픽셀의 흑백 값을 구해 CD방향으로 평균을 내어 두께 방향에 대한 밀도 변 이를 평가하였다. 그 결과 압력보다는 온도를 높여 캘린더링한 경우 종이의 두께 방향 밀도 경사가 커진다는 사실을 확인할 수 있었다. 이는 고온에 의해 표층이 고밀화되고 상대적으 로 내부가 별크해졌기 때문이다. 이러한 밀도 변이가 종이의 광학적 성질인 불투명도에 미 치는 영향을 구명하기 위해서 캘린더링 전후에 두께 및 불투명도를 측정하여 5% 유의수준 에서 회귀분석을 실시하였다. 밀도경사를 지닌 종이의 불투명도를 이론적으로 해석하기 위해 다층 모델을 가정하 고 각 층의 비광산란계수(5)와 비광흡수계수(k)를 달리 부여하고 Kubelka-Munk 이론을 근 거로 하여 이론적 불투명도를 계산하였다. 불투명도에 대한 분석를 통해 동일한 두께 변형 을 가지는 샘플에 대해서 압력보다는 온도를 증가시켜 두께를 감소시키는 캘린더링 처리가 불투명도의 저하를 최소화한다는 것을 확인하였다.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.44 no.5
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• pp.28-34
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• 2007

A histogram-based road border line extractor is proposed for an efficient road extraction from the high-resolution satellite imagery. The road border lines are extracted from an edge strength map based on the directional histogram difference between the road and the non-road region. The straight and the curved roads are extracted hierarchically from the edge strength map of the original image and the segmented road cluster images, and the road network is constructed based on the connectivity. Unlike the conventional approaches based on the spectral similarity, the proposed road extraction method is more robust to noise because it extracts roads based on the histogram, and is able to extract both the location and the width of roads. In addition, the proposed method can extract roads with various spectral characteristics by identifying the road clusters automatically. Experimental results on IKONOS multi-spectral satellite imagery with high spatial resolution show that the proposed method can extract the straight and the curved roads as well as the accurate road border lines.

• Culinary science and hospitality research
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• v.17 no.1
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• pp.58-77
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• 2011

In this study, the correlation between harmony of coffee-food and taste preference was examined by conducting an investigative analysis in oilier to find out taste preference having effect on the harmony of coffee-food. As a result of study, foreign food was perceived as having average level or higher harmony in confectionery and bread in harmony of coffee-food, coffee beans were perceived as being more harmonious than a coffee mix. Korean food was perceived as average or lower harmony with coffee with s relatively high level in rice cake, traditional snacks and Hangwa, all of which are traditional desserts. In the correlation between taste preference and harmony of coffee-food, foreign food was shown well-matched with coffee as sweet and salty tastes were low; however, for sour, hitter, spicy and plain tastes, the more preference they had, the better-matched they were. As a result, taste preference had effect on harmony with coffee-food. For foreign food, it was shown that sweet and plain tastes influenced it while bitter and plain tastes did in Korean food in general.

• (The)Study of the Eastern Classic
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• no.66
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• pp.227-250
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• 2017

The Conception of the Dao(道) have a large number of implication. The Dao is Taoism's representative concept, also the Confucianists considered the Dao important. But relatively the Confucianists emphasize the way of Human(人道), Taoists stress the way of Heaven(天道) The Justice is the western philosophical conception. The Justice is necessary for the peace and prosperity in interindividual, inter-social, and international. If closely consider, We can explain the real nature of Justice from the Dao, and know practicing the Dao is namely practicing the Justice. In this paper, I studied the conception of Dao and it's meaning in the philosophy of Lao-tzu (B.C. 604?~531?) and Confucius(B.C. 552~479), and researched the method of practicing the Justice. Through this study, I ascertain that Confucian's the way of Human is the Benevolence(仁), practicing the Benevolence is namely practicing the Justice. And Lao-tzu's he way of Heaven is the real nature of Justice, Nature itself remained intact(無爲自然) is namely practicing the Justice.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.20 no.4
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• pp.95-105
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• 2021

Road surface damage detection is essential for a comfortable driving environment and the prevention of safety accidents. Road management institutes are using automated technology-based inspection equipment and systems. As one of these automation technologies, a sensor to detect road surface damage plays an important role. For this purpose, several studies on sensors using deep learning have been conducted in recent years. Road images and label images are needed to develop such deep learning algorithms. On the other hand, considerable time and labor will be needed to secure label images. In this paper, the adversarial learning method, one of the semi-supervised learning techniques, was proposed to solve this problem. For its implementation, a lightweight deep neural network model was trained using 5,327 road images and 1,327 label images. After experimenting with 400 road images, a model with a mean intersection over a union of 80.54% and an F1 score of 77.85% was developed. Through this, a technology that can improve recognition performance by adding only road images was developed to learning without label images and is expected to be used as a technology for road surface management in the future.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.20 no.6
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• pp.214-227
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• 2021

The purpose of this study is to find the driving difficulty of automated vehicles in terms of road infrastructure operation. It was judged out of this study that the level of automated driving would be enhanced if the road situation recognition ability was advanced through the presentation of infrastructure information during the difficult driving situations. The difficulty evaluation index was divided into three stages, and a survey of experts and an AHP were conducted. The result of the AHP showed that the driving difficulty of the interrupted flow was much higher than that of the uninterrupted flow. The AHP results also showed that and the driving difficulty of unsignalized intersections and roundabouts under an interrupted flow was evaluated as the highest. The top six driving situations with high difficulty were also evaluated to occur under unsignalized intersections and roundabouts.