• Communications for Statistical Applications and Methods
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• 제4권3호
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• pp.847-858
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• 1997

In this note we develop a partial ordering among positive lower orthant dependent distributions with fixed marginals. This permits us to measure the degree of positive lower orthant dependence. Some basic properties and preservation results are derived.

• Reproductive and Developmental Biology
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• 제37권4호
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• pp.213-217
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• 2013

The objective of this study was to investigate the effect of bacterial contamination on elapsed time after preservation on boar semen. Known numbers of Escherichia coli (E. coli) were inoculated to freshly ejaculated semen and sperm parameters such as viability, motility, agglutination, acrosome integrity and hypo-osmotic swelling test were performed during 7 days of liquid preservation. Semen samples were prepared using antibiotic free BTS extender and 4 different levels of E. coli were treated to semen with following concentrations; 3,000, 5,000, 7,000, 10,000 CFU/ml of sperms. Semen samples were preserved at $17^{\circ}C$ for 7 days in semen storage until analyzed. Aliquots were subjected to measure the sperm viability, motility and agglutination using computer assisted sperm analysis (CASA) system, acrosome integrity was performed using chlortetracycline (CTC) staining method and hypo-osmotic swelling test was performed using hypotonic solution from day 1 (day of semen collection) to 7. Detrimental effects on sperm motility and viability were observed 3 days after preservation at the level of 5,000 CFU/ml (p<0.05). Percentage of sperm abnormality was higher (p<0.05) in over 5,000 CFU/ml groups. Sperm agglutination rate was also significantly higher (p<0.05) in groups of 5,000 and 7,000 CFU/ml. The rate of acrosome reacted sperm was higher as preservation time goes in all the samples but the pattern was clearly higher among E. coli contaminated groups (p<0.05). The sperm membrane integrity in terms of hypo-osmotic test, E. coli affects little compared to other sperm parameters. The deleterious effects observed due to the bacterial contamination in semen suggest that importance of hygiene protocol to minimize the bacterial contamination during semen collection and processing.

• 보존과학연구
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• 통권30호
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• pp.47-61
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• 2009

Cultural heritages are affected by various environmental factors. Main factors are temperature, humidity, light and indoor air pollutants such as ozone, nitrogen oxides. Especially humidity condition is very important. Low humidity condition can cause contraction and high humidity condition can lead to growth of microorganism. This study is conducted to appraise an applicability of the Humidity Indicator which is one of the simple method for humidity control. The Humidity Indicator shows the humidity conditions through color change. Therefore, photometer was used to correctly measure the color change of Humidity Indicator. As a result of lab test, Humidity Indicators was stabilized after one hour from en exposure in a certain humidity condition and the indicators indicated clear correlations between color changes of Humidity Indicators and humidity conditions. Some Humidity Indicators which had been selected through the lab tests were applied to preservation facilities of cultural heritages and the indicators indicated closed correlations with humidity conditions in indoor of facilities.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 봄 학술발표회 논문집
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• pp.317-322
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• 2002

In modern times, the environment preservation is global tendency and self social awareness is arise. Measures to the environment preservation and pollution is going on study. One measure is recycling and reuse of by product and it is already developed in some advanced country. There is 7 hundred thousand tons of copper slag production from copper refining process in domestic. The purpose of this study is reusing copper slag -by product which produced L cooperation in domestic-as fine aggregate for producing high strength concrete and investigating the fundamental characteristics.

• 한국식품저장유통학회지
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• 제1권2호
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• pp.99-105
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• 1994

To convert the analog signal from the drying process into the digital signal, the interface circuit was designed and built. To measure the weight and temperature during drying process, strain gauge type load cell and temperature transducer composed of pt 100 $\Omega$ thermometers and wheatstone bridge circuits were built and used. The temperature control device was composed of photocoupler and triac. Microcomputer aided experimental convective drying system was built with above cricuits and devices. Drying characteristics of onions can be estimated using this system.

• 가족자원경영과 정책
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• 제6권1호
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• pp.135-147
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• 2002

The purpose of this study was to achieve regarding the environmental problem due to excessive economic development for human being's continous life and to try to enhance the quality of life. The major findings of this study are as followings: 1) Environmental consciousness and activity are closely correlated and also postively related to quality of life. Accordingly, environmental consciousness should be inspired and the environmental activities performed successfully to enhance the quality of life so that we can lead higher quality of life. 2) Income takes the highest position in the life-influncing factor with the following sequence of environmental consciousness, preservation acitivity, housekeeper's education level and age. So, earlier and steady education are important in raising the education level to have people equipped with environmental consciousness and activity. Moreover, we should be able to create income through education to enhance the quality of life. Accordingly, we should take a positive measure for enhancing environmental preservation and quality of life to meet two solutions, such as mankind's continuous development and value-oriented life.

• Ocean and Polar Research
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• 제44권4호
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• pp.311-317
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• 2022

Seed germination and seedling growth of a halophyte, Suaeda japonica were examined to measure the effects of seed preservation periods and various soil compositions in the mudflat of Saemangeum, Korea. Seed germination declined from 74.30% to 44.30% as the preservation period increased from 4 months to 12 months. After 14 days of seeding, seed germination was lowest in sandy soil (SS) at 8.67% and highest in earthworm cast+leaf mold (EC+LM) at 67.33%, showing 4~5 times higher than SS. The average lengths of seedlings were 12.20 mm in SS and 42.20 mm in EC+LM, respectively. These results suggest that seed germination and seedling growth enhanced in the soil that has more organic matter. In the experiment mixing Saemangeum soil (SMS), seed germination was from 4.00% in SMS to 88.00% in the soil of SMS+EC+LM after 14 days. Similar growth patterns were observed in the length of seedlings from 5.00 mm in SMS to 49.60 mm in SMS+EC+LM. The present results indicate that a population of Suaeda japonica could be established by stimulating seed germination and seedling growth by the addition of organic matters such as EC, LM, and EC+LM in the Saemangeum mud flat.

• 한국정보과학회논문지:데이타베이스
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• 제35권6호
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• pp.481-494
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• 2008

본 논문에서는 시계열 데이타 클러스터링에서 DFT 진폭 기반의 프라이버시 보호 기법을 제안한다. 기존의 프라이버시 보호 연구인 DFT 계수 기법은 원본과 유사한 데이타가 복원될 수 있어 프라이버시 보호 측면에서 큰 문제점이 있다. 반면에, 제안한 DFT 진폭 기법은 DFT 변환 후에 위상을 제외한 진폭만을 사용함으로써 원본 데이타를 복원하기 매우 어려운 특징을 가진다. 본 논문에서는 우선 기존의 DFT 계수 기법이 복원이 용이한 함수이고, 제안한 DFT 진폭 기법이 복원이 어려운 함수임을 체계적으로 설명한다. 다음으로, 클러스터링 정확도를 대신하고 진폭을 선택하기 위한 척도로서 거리-순서 보존정도의 개념을 제안한다. 거리-순서 보존 정도는 객체들의 상대적 순서가 클러스터링 보호 함수의 적용전후에 얼마나 보존되는지의 척도를 나타낸다. 본 논문에서는 이러한 거리-순서 보존 정도의 개념을 사용하여 DFT 진폭 기법에서 진폭을 선택하는 탐욕적 전략들을 제시한다. 즉, 제안한 탐욕적 전략은 거리-순서 보존 정도를 극대화하는 방향으로 DFT 진폭을 선택하여, 궁극적으로 클러스터링 정확도를 높이고자 하는 방법이다. 마지막으로 실험을 통해 제안한 거리-순서 보존 정도가 클러스터링 정확도를 대신할 수 있는 척도임을 보인다. 또한, 제안한 DFT 진폭 기법의 탐욕적 전략들이 기존의 DFT 계수 기법에 비해 정확도가 크게 떨어지지 않음을 확인한다. 이 같은 결과를 달 때, 제안한 DFT 진폭 기법은 DFT 계수 기법에 비해 프라이버시 보호 정도를 크게 개선했을 뿐 아니라 비교적 정확한 클러스터링 정확도를 보이는 우수한 연구 결과라 사료된다.

• 농촌계획
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• 제16권2호
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• pp.11-19
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• 2010

Pro-environmental life styles, foundations of a collective civilization and preservation of our tradition at rural communities hold a great public profit value, of which importance has been strongly emphasized during last decade. Here, the environmental color is one of the most influential elements that determine the image of the rural landscape. Whenever an alternative color element is introduced to rural town, it is very important to examine its effect on the existing environmental color. Typically, a preference-surveying method has been used to evaluate the suitability of such environmental color balance. However, we note that the reliability of this method is limited by the subjectivity of a respondent. And thus, it is highly desirable to develop a more objective method. We propose a feasibility study for using an aesthetic-measure to evaluate the environmental color of a rural town. In this work, we looked into the validity of our approach by comparing its result with that of the preference-based-method as a way to determine the environmental color. Our study is based on 20 photo images from Ansung-city Yangsung-myeon Donghang 2ri Kyo-dong town in Kyongki Province.

• 헤리티지:역사와 과학
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• 제55권2호
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• pp.232-249
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• 2022

본 글은 우리나라 선사시대 사적의 지정·보존·관리의 전반적 현황을 점검하고 향후 선사시대 사적의 활용 방향을 모색하기 위한 목적으로 작성되었다. 본격적인 논의에 앞서 한국의 선사시대 사적에 대한 전반적인 현황을 파악하기 위해 시대 및 유구 성격에 따른 선사시대 사적의 지정 현황을 비롯하여 선사시대 사적의 지정 면적, 지역별 분포 양상 등을 자세히 살펴보았다. 아울러 현 선사시대 사적의 보존·정비·관리 현황에 대한 전반적 상황을 파악하였다. 다음으로 우리나라 선사시대 사적의 보존·관리 실태를 확인하기 위해 현지답사를 통해 울주 검단리 유적, 부여 송국리 유적, 홍성 석택리 유적 등 몇몇 유적의 현황을 점검하고 선사시대 사적의 보존·정비·관리 방안에 대한 몇 가지 의견을 개진하였다. 울주 검단리 유적은 유적의 성격을 고려하여 유구 관련 시설물을 설치할 필요가 있는데, 복토현장보존 뿐만 아니라 노출현장보존이나 이전보존을 병행하는 방안이 요구된다. 부여 송국리 유적은 유적의 전체적인 범위와 유구 분포를 파악하기 위한 정밀지표조사와 시굴조사가 선결되어야 하며, 무엇보다 뚜렷한 목적을 가진 학술발굴이 계획적이고 지속적으로 실시되어야 한다. 홍성 석택리 유적과 같이 획기적이고 학술적 가치가 높은 고고 자료가 확인되고 역사적 가치와 고고학적 중요성이 인정되는 보존조치 유적의 경우, 보존 현황과 관리 상태를 우선 점검하여 국가지정문화재의 지정을 적극적으로 검토할 필요가 있다. 마지막으로 미국 국가사적의 문화유산 보호보전 및 운영관리 체계, 학술조사연구 프로젝트 사례를 들어, 우리나라 선사시대 사적을 보다 효과적으로 보존·관리하고 활용하기 위해서는 문화유산의 교육·연구적 측면과 사회·경제적 측면 모두를 고려한 활용 방향성이 요구된다는 점을 강조하였다. 문화유산의 적극적 활용이 유적의 지속적인 보존·관리로 이어지는 방안이 될 수 있으며 궁극적으로 선사시대 사적의 가치를 증대시키는 지름길이 될 수 있을 것으로 보았다.