• Journal of agriculture & life science
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• v.45 no.1
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• pp.101-107
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• 2011

A Total of 48,101 performance records of sows for Yorkshire and Landrace breeds were collected from swine breeding farms in Korea from 2001 to 2008. A general ingredient analysis included the fixed effects of breed, parity, year, season, and farm. For the number of heads per 1st parity analysis by each growth traits, the data of 48,101 heads was used to analyze growth traits group. In the general ingredient analysis, the results showed high significance except for lean percentage by season (p<0.05). Average daily gain of Landrace breed ($640.48{\pm}0.749g$) was better than that of Yorkshire breed ($624.22{\pm}0.608g$), and the backfat thickness of Yorkshire breed ($13.44{\pm}0.030mm$) was thicker than that of Landrace breed ($12.50{\pm}0.037mm$). For the number of born alive and number of stillborn by growth traits for each breed, number of born decreased after test end day of 161 to 165 day, and average daily gain of 620 g to 640 g and the highest number of born appeared at the backfat thickness of 13 mm to 14 mm for yorkshire breed. In case of Landrace breed, number of born was the highest, and the number of stillborn increased together with average daily gain. The number of born was high when backfat thickness was less than 11 mm. The number of born trended to decrease when backfat thickness increased.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.13 no.1
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• pp.41-45
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• 2003

Infrared spectroscopy is a powerful tool for gem identification and research. Therefore, this study was focused to a method of the identification of amethyst, citrine, rock quartz and jadeite by the FT-IR. The FT-IR measurement was very effective in judgement of amethyst, citrine and rock quartz whether they are natural and synthetic. And FT-IR was very useful for the distinguishment of the natural jadeite (A-Jade) from wax/polymer-impregnated jadeite (B-Jade). Such technique will be helpful to identify new challenges present by treatments and synthetics.

• 도로교통
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• s.94
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• pp.51-64
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• 2003

본 연구는 사고요인과 사고모형의 문헌고찰을 통해 고속도로를 주행하는 버스와 화물차의 사고모형을 개발하고 그 적용방안에 대해 고찰하고자 수행되었다. 고속도로 사고 중 대형차로 인한 차량당 사고율은 승용차보다 월등히 높아 사고의 심각성을 나타내고 있으며, 따라서 이에 대한 별도의 검토가 필요한 시점에 와 있다. 특히 본 연구에 활용된 자료는 비집계된 사상자수로 구간자료를 집합화함으로써 발생하는 문제점을 해소할 수 있다. 모형의 분석기법으로 국내의 경우, 대부분 단순회귀식으로 사고모형을 개발, 적용하여 왔으나 사고수와 사상자수의 특성상 이산적 확률변수로 해석하여 포아송분포와 음이항분포로 적용하는 것이 바람직하다. 따라서 본 연구에서는 버스와 화물차의 사고유형별로 적합한 사고 모형을 개발하여 이로 인한 인사사고 요인에 대한 영향을 분석하고 그 적용방안을 제시하였다. 이러한 연구는 도로설계, 운영, 교통법규, 교통행정 등의 분야에서 거시적인 정책적 방향성을 제시하리라 판단된다. 특히 본 연구는 고속도로 운영주체인 한국도로공사의 고속도로사고조서를 바탕으로 사고유형별 사고모형을 개발, 적용한 것으로 고속도로의 안정성 향상을 위한 제반 정책 수립에 기초자료로 활용될 것으로 기대된다.

• Proceedings of the Korean Association for Survey Research Conference
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• 2001.04a
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• pp.87-108
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• 2001

Recently, the user of mobile and cordless internet is growing rapidly. So the advertising methodologies are appeared on stage through the internet and mobile service. But the current advertisement(AD) service into mobile phones supplies a short-sentence AD using letter-message, and gives mobile phone users an inconvenience by making them first listen to and then check the AD. Until now the AD service using mobile has been on the beginning level. In this study, we suggest the new advertising methodologies and propose both target marketing strategies and demand forecast through the data mining techniques.

• Survey Research
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• v.2 no.1
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• pp.87-108
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• 2001

Recently, the user of mobile and cordless internet is growing rapidly. So the advertising methodologies are appeared on stage through the internet and mobile service. But the current advertisement(AD) service into mobile phones supplies a short-sentence AD using letter-message, and gives mobile phone users an inconvenience by making them first listen to and then check the AD. Until now the AD service using mobile has been on the beginning level. In this study, we suggest the new advertising methodologies and propose both target marketing strategies and demand forecast through the data mining techniques.

• Digital Contents
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• no.1 s.80
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• pp.80-81
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• 2000

올해 하반기에 국내 인터넷 이용자수가 1천만명을 돌파할 전망이다. 인터넷 리서치 전문기관인 인터넷 메트릭스(대표 이상경)는 지난해 6월과 11월 실시한 '인터넷 센서스'를 토대로 2000년 말 국내 인터넷 인구가 1,100만명에 이르고 월드컵이 열리는 2002년에는 전체 국민의 절반 정도가 인터넷을 이용하게 될 것이라고 전망했다.

• Journal of Korean Society of Transportation
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• v.24 no.3 s.89
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• pp.157-165
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• 2006

The Purpose of this study is to analyze telecommunications impacts on travel in a comprehensive system, considering demand, supply, costs, and land use. This study first Presents a conceptual model, considering causal relationships among travel, telecommunications, land use, economic activity, and socio-demographics. Then, based on the conceptual model, the aggregate causal relationships between telecommunications (local telephone calls, toll calls, and mobile phone subscribers) and travel (vehicle-miles traveled and number of transit Passengers) are explored in a comprehensive framework, using structural equation modeling of national time series data spanning 1950-2000 in the U.S. The model results suggest that as telecommunications demand increases, travel demand increases, and vice versa. Additionally. transportation infrastructure and land use significantly affect travel demand.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.18 no.4
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• pp.146-154
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• 2008

This study was carried out for the purpose of obtaining the basic data for color identification of amethyst by spectrophotometer. For this, the eleven amethyst stone and one citrine stone from eight countries were prepared in facet cut or plate. The transmittance and reflection of this samples were investigated as a function of wavelength. The transmittance or reflection was transformed to tristimulus value (X, Y, Z) and chromaticity value (x, y, z) and then compared with the results of eye observation which was plotted on cm xyY color space. Finally, the influence of the amethyst's thickness on transmittance or reflection was investigated.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.01a
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• pp.243-244
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• 2022

본 연구는 코로나-19로 인해 아프리카 국가들 중 1인당 사망자수와 케이스 수 그리고 환경적 요인과 의료 환경 요인을 데이터베이스화하여 다각적인 방면에서 측정하고 분석하였다. 코로나로 인해 사망자수가 증가하였으나 무엇이 가장 영향을 끼친 요인인지에 대해서 아직 정확히 밝혀진 바가 없다. 또한, 코로나 특성상 하나의 요인이 아닌 여러 요인이 혼합적으로 작용하여 일어나기 때문에, 여러 상황을 가정하여 외부 환경과 의료 환경을 모두 분석하였다. 이를 통해 요인을 확인하고 요인이 없다면 향후 다른 요인을 밝혀내기 위해 필요한 자료로 사용될 것이며 앞으로 각 국가별로 정책을 실행할 때 이를 이용해 '위드 코로나', '폐쇄 정책' 등을 실시할 수 있을 것으로 기대된다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.21 no.2
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• pp.33-43
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• 2022

The number of car crashes increases along with the increasing number of vehicles. Hence, diverse initiatives on traffic accidents have been implemented, targeting zero crash fatalities. According to the 3rd Traffic Safety Master Plan of 2016, the current standard selecting road accident black spots prioritizes locations with the high cumulative death toll. While this standard is suitable for roads that a city government manages to some extent, it is not suitable for roads less than 20 meters that a borough (Gu) handles. The roads under the supervision of a borough do not have enough death toll, and thus improvements on its road accident black spots are highly limited. In addition, discovering the causes of traffic accidents is not easy when the number of car accidents is obtained by considering only fatal accidents, which are relatively low in number. Therefore, including all traffic accidents might identify causes of accidents and result in better advancements. Therefore, this research follows rational decision-making and suggests new National Traffic Safety Master Plan standards. These new standards are obtained by comparing accident costs between the location of fatal crashes and road accident black spots. The analysis result shows that considering all types of accidents yields better results. For example, a Three-way Intersection in front of Zion Day Care Center, one of the selected spots under the current standard, has lower road crash costs than Sinchon Intersection, a selected spot under a new standard. Therefore, the study concludes that the standards to select road accident black spots need to include traffic accident severity and road crash costs.