• Journal of Korea Society of Digital Industry and Information Management
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• v.8 no.4
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• pp.63-71
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• 2012

Recently, because most of buildings in the city become bigger and higher, so various convenient facilities and high-tech management skills are required to prevent potential disasters. Especially, because fires in huge buildings can cause serious damage, technologies and methods that help people quickly and safely to escape from the building is very important to extinguish the fire in initial state and to minimize the damage. This paper suggests a context-aware service system that can provide optimal escape routes to tenants with their smart-phones. The proposed system collects contexts with real time through USN(Ubiquitous Sensor Network) and provides an optimum escape route based on the collected contexts through service users' smart phones. In addition, The system provides not only safe routes from the fire but also valuable information for rescue operations with real time.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.04a
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• pp.575-576
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• 2016

SNS 사용자가 급증함에 따라 그와 관련된 데이터 또한 폭발적으로 증가하고 있다. 이로 인해, 사회 연결망 데이터 분석을 위한 여러 그래프 처리 엔진들이 개발되었다. 본 논문에서는 최신 그래프 처리 엔진 중 하나인 FlashGraph의 특징을 분석하고 수행 시간을 개선하기 위해 무작위로 매겨진 입력 데이터의 노드 번호를 지역성을 고려해 너비우선탐색 순서로 바꾸어 저장하는 방법을 제안하였다. 실험결과, 수행 시간을 약 1.4배 향상시켰다.

• Proceedings of the KIEE Conference
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• 2003.07a
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• pp.375-377
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• 2003

수용가에게 영향을 끼치는 전력품질 문제를 다루기 위해서는 3상 전압변동, 전압불평형, 순간전압상승(Swell), 순간전압강하(Sag), 순간정전(Interruption)등의 발생시 측정된 Data들을 근간으로 하여 전력품질을 분석할 필요가 있다. 본 논문에서는 이를 위해 개발된 PQMS DataBase 분석프로그램을 소개하기로 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.747-749
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• 2014

행렬 곱셈은 다양한 사회연결망을 포함한 빅 데이터 분석에 핵심이 되는 연산 중 하나이다. 본 연구에서는 행렬 곱셈 방법 중 내적과 행-행 곱셈에 대한 성능 분석과 실제 사회연결망 데이터 셋을 이용한 행렬 곱셈 시간을 분석한다. 본 연구의 실험환경에서 행렬 곱셈 방법 중 행-행 곱셈이 내적보다 약 125 배 빠르다는 것을 확인했고, 실제 사회연결망 데이터 셋을 행렬 곱셈했을 때의 시간은 읽기, 쓰기 등 저장장치 접근 시간이 행렬 곱셈 전체 수행 시간의 약 90% 이상 차지한다는 것을 확인했다. 따라서 사회연결망 데이터 분석을 위한 행렬 곱셈에서 저장 장치 접근 시간을 줄이는 것이 전체 계산 수행 시간을 줄이는 것의 핵심임을 이야기한다.

• Korean Journal of Weed Science
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• v.7 no.3
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• pp.337-347
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• 1987

Spary and vapor drift injuries of apple, pear, and peach seedling caused by soil-applied oxyfluorfen were studied in a greenhouse. Bud bursting rate of all fruit trees was reduced by both spray and vapor drifts of oxyfluorfen, but reduction in bud bursting rate of pear and peach was greater than that of apple trees. Reduction in the number of leaves per shoot of apple and peach was greater than that of pear trees. Leaf injury of pear was most severe and occurred earliest, but leaves of peach were least injured, Leaf injuries of pear and apple were caused by both spray and vapor drifts, but leaves of peach was injured largely by vapor drift. Reduction in shoot growth of and pear was greater than that of peach trees. Shoot growth of pear was more rapidly retared compared with apple trees. In the field, oxyfluorfen delayed the time of bud bursting in young apple trees. Oxyfluorfen applied between initiation and completion of bud bursting delayed bud bursting more than earlier application although ultimate number of bursted buds was similar to control. The number of leaves per shoot and total length of shoots were lower than control until 40 days after application of oxyfluorfen, and then were similar to control because of vigorous growth after May.

• Transactions of the Korean Society of Pressure Vessels and Piping
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• v.4 no.2
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• pp.40-45
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• 2008

There exist many types of pipe and component fatigue through vibrations, thermal fatigues or shifting. In some cases of thermal stratification/thermal fatigue, pipes & components are receiving thermal stress by means of material expansion and shrinkage by continuous thermal repetitive variation. Small cracks initially occur on the inside surface by thermal stress. These cracks grow in depth the pipe wall and finally come to a rupture. Pipe parts of susceptibility to thermal stratification and thermal fatigue are now being examined by conventional UT(ultrasonic test) as volumetric examination. It is difficult to fully satisfy the code & standards requirements because 3" weldolet weldments of RCS 16" pipe to 3" branch connection lines have complex structural shape. To solve the problems of conventional UT examination, we made a realistic mock-up and UT calibration block. We performed a simulation of phased array UT utilizing CIVA as NDE(Non-Destructive Examination) simulation software. Also we designed phased array UT transducer and wedge, optimal frequency by using simulation data. We performed phased array UT experiment through mock-up including artificial flaws(notch). The phased array UT technique is finally developed to improve the reliability of ultrasonic test at RCS 16" pipe to 3" branch connection weld.

• Journal of Animal Science and Technology
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• v.48 no.3
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• pp.345-352
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• 2006

Korean native cattle (Hanwoo) have a good capacity to produce heavily marbled meat of high value. The intramuscular fat in Hanwoo is known to be deposit from 12 months of age by degree of slightly visible and significantly developed in 28 months of age. Lipogenesis gene expression profiling in longissimus dorsi at early and late fattening stage will be helpful to understand the mechanism of intramuscular fat deposition in skeletal muscle. Therefore, we analysed the gene expression patterns of six genes related lipid metabolism (FABP4, GLUT4, LPL, ACC, ACL and SCD) between early and late fattening stage. The mRNA expression of FABP4 at late fattening stage (27 months old) was higher about 3.0 fold than at early fattening stage (12 months old) in each three individuals of Hanwoo. However, GLUT4 mRNA expression was not different at late fattening stage compared with at early fattening stage. On the other hand, The expression patterns of LPL, ACC, ACL and SCD genes related lipid metabolism were significantly over-expressed about 3.5 fold, 2.7 fold, 3.7 fold and 7.5 fold at late fattening stage, respectively. Thus, these results suggested that lipogenesis in skeletal muscle at late fattening stage is due to increasing uptake of fatty acid by FABP4 and lipogenesis gene expression such as LPL, ACC, ACL and SCD.

• Journal of Korea Multimedia Society
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• v.9 no.1
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• pp.33-40
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• 2006

This paper presents an efficient face recognition method using both first moment of image and eigenvector. First moment is a method for finding centroid of image, which is applied to exclude the needless backgrounds in the face recognitions by shitting to the centroid of face image. Eigenvector which are the basis images as face features, is extracted by principal component analysis(PCA). This is to improve the recognition performance by excluding the redundancy considering to second-order statistics of face image. The proposed methods has been applied to the problem for recognizing the 60 face images(15 persons *4 scenes) of 320*243 pixels. The 3 distances such as city-block, Euclidean, negative angle are used as measures when match the probe images to the nearest gallery images. In case of the 45 face images, the experimental results show that the recognition rate of the proposed methods is about 1.6 times and its the classification is about 5.6 times higher than conventional PCA without preprocessing. The city-block has been relatively achieved more an accurate classification than Euclidean or negative angle.

• Journal of Ocean Engineering and Technology
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• v.13 no.3 s.33
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• pp.92-99
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• 1999

High temperature and pressure materials in power plant are degraded by creep damage, if they are exposed to constant loads for long times, which occurs in load bearing structures of pressurized components operationg at elevated temperatures. Many conventional measurement techniques such as replica method, electric resistance method, and hardness test method for measuring creep damgage have been used. So far, the replica method is mainly used for the inspection of high temperature and pressure components. This technique is, however, restricted to applications at the surface of the testpieces and cannot be used to material inside. In this paper, ultrasonic evaluation for the detection of creep damage in the form of cavaties on grain boundaries or intergranular microcracks were carried out. And the absolute measuring method of quantitative ultrasonic velocity technique for Cr-Mo material degradation was analyzed. As a result of ultrasonic tests for crept for specimens, we founded that the sound velocity was decreased as increase of creep life fraction(${phi}c$) and also, confirmed that hardness was decreased as increase of creep life fraction(${phi}c$).

• Journal of Haehwa Medicine
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• v.28 no.2
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• pp.1-11
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• 2019

Objective: The aim of this study is to analyze the previously published research articles related to puffer fish toxin focusing on tumor. Method: Literatures were searched in PubMed database, published since 2000, using the keyword; Puffer fish, Fugu and tetrodotoxin (TTX) with cancer or tumor. Research papers were classified by year, country, study model, used material, kind of tumor and study subject. Finally, a total of 41 studies were analyzed in this study. Results: From 2000 to 2018, the most abundant papers were published in 2009 (6 studies) and almost half of the papers were studied in United Kingdom (20 studies). The 39 studies used TTX purified from puffer fish while 2 studies used crude extract of skin and gonad of puffer fish. The most used target cell line was prostate cancer (15 studies), and the next was breast cancer (14 studies). The study methods were classified into 4 clinical studies, 2 animal studies and 35 cell-based studies. Conclusions: Our results show that the overview of cancer-related studies using puffer fish poison. This information would be helpful for the puffer fish-derived drug researches in the future.