• The Korean Journal of Ecology
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• 제21권1호
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• pp.1-6
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• 1998

Effects of air pollutants on the chemical properties of soil in Yoch'on inductrial complex were investigated. Soil pH showed severe acidity with average value of 4.3$\pm$0.13. Soil pH decreaed along the increase in altitute of Mt. Jeseok. Soil organic matter and total N was 19.2$\pm$3.6% and 4.7$\pm$0.25mg/g, respectively, which were higher than those of unpolluted area, Kongju. Available P was 41.2$\pm$3.7 $\mu$g/g, which was 4 times greater than that of unpolluted area, Kongju. Average content of total-S was 283.5$\pm$14.1 $\mu$g/g, which was 10 times greater than that of unpolluted area. Content of available Al was o.43$\pm$0.03 mg/g, which was 2 times greater than that of unpolluted area. Available Al increased as the soil pH decrease. Contents of exchangeable K, Ca and Mg were significantly lower than those in unpolluted area, because of severe leaching in acid soil.

• 한국환경보건학회지
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• 제10권2호
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• pp.69-77
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• 1984

Air pollution has been one of the severe problems in city area. Sulfur dioxide is the major pollutant among the air pollutants. And the lichen as a botanical indicator have been used to predict the air pollution level. This study was carried out to evaluate the air pollution level in Taejon area through the field survey which were checked lichen status and sulfur dioxide content in the atmosphere. The results were as follows 1. The average sulfur dioxide content in Taejon area was 0.031ppm. The comparison of measurement methods were regression equation, Y= 0.357$\times$+0.014 and correlation factor, r = 0.771. 2. The maximum point of the SO$_2$ level was site No. 2(Daehwa-Dong), 0.087 ppm and the minimum, site No. 8 (Doma 2-Dong), 0.009ppm. 3. Total amounts of sulfur dioxide yearly emitted from Taejon area by fuel consumption estimated 29829.6 tons. 4. The relationship between degree of lichen and sulfur dioxide contents were 0.000~0.020ppm : Zone No. 2 0.020~0.060ppm : Zone No. 1 over 0.060ppm : Zone No. 0

• 대한수학교육학회지:수학교육학연구
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• 제22권4호
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• pp.495-515
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• 2012

본 연구에서는 평면도형의 넓이에 대한 교사의 교수학적 내용 지식(PCK)을 설문지와 수업 관찰을 통해서 분석하였다. 연구 결과, 다음과 같은 4가지 결론을 얻을 수 있다. (1) PCK의 '수학 내용 지식' 영역에서 교사는 넓이의 개념, 넓이와 길이의 속성 구분을 정확히 이해하고 배열구조를 지도의 대상으로 인식하여야 한다. (2) PCK의 '수학과 교수 방법 및 평가에 대한 지식' 영역에서 교사는 교과 목표를 넓이의 개념 이해와 공식의 이해를 균형적으로 설정하고 평가해야 한다. (3) PCK의 '수학 학습에 대한 학생 이해 지식' 영역에서 교사는 설명 위주의 오류수정 보다 넓이의 개념의 이해에 대한 활동을 제시해야 한다. (4) PCK의 '수학과 수업 상황에 대한 지식' 영역에서 교사는 교과서에 대한 주체적 의식을 가지고 교과서의 활동을 보완하여야 한다.

• 한국광물학회지
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• 제18권2호
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• pp.93-107
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• 2005

부산 신항만 및 녹산공단 지역을 포함하는 낙동강 하구 유역에는 두꺼운 점토질퇴적물이 퇴적되어 연약지반을 구성하고 있다. 이곳의 4개의 시추공에서 채취한 점토퇴적물에 대해 광물성분과 공학적 토질물성을 분석하여, 깊이에 따른 변화를 검토하고 그들의 상관관계를 검토하였다. 그 결과 점토퇴적물 속에 함유된 일부 광물조성은 토질물성과 약간의 상관관계가 있는 것으로 나타났다. 즉, 석영의 함량은 습윤단위중량과 정의 관계이고, 액성한계와는 부의 상관관계를 보였다. 함수량은 장석의 함량과는 부의 관계이고, 점토광물의 함량과는 정의 관계를 나타냈다. 습윤단위중량은 점토광물의 함량과는 부의 관계를 나타냈다. 그리고 복합적 인자에 의한 상관분석 결과에서 소성지수는 점토광물, 스멕타이트, 점토입토의 함량과 일정의 관계식을 가지는 것으로 나타났다.

• 한국콘텐츠학회논문지
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• 제12권6호
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• pp.48-55
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• 2012

스마트폰이나 태블릿 PC와 같은 모바일 디바이스에 이용되는 디지털 콘텐츠 수가 IT 산업 발달과 함께 급속도로 증가하고 있다. 이와 함께 디지털 콘텐츠 관리 방법에 대한 연구도 활발히 진행되고 있다. 기존 연구에서 인터넷 불가능지역에서 모바일 디바이스간에 디지털 콘텐츠 활용 정보를 효율적으로 관리할 수 있는 CTI가 정의되었으며, 콘텐츠가 전달될 때 마다 생성되는 CTI에 대한 관리, 오버헤드 감소, 가능한 빠른 시간에 많은 CTI를 수집할 수 있는 기술 등과 같은 콘텐츠추적정보 관리 방법을 제안하였다. 본 논문는 콘텐츠추적정보 관리 방법을 검증하고, 성능을 분석할 수 있는 시뮬레이터를 설계, 구현하였다. 이 시뮬레이터는 인터넷 접근이 안되는 환경에서 모바일 디바이스의 이동에 따른 콘텐츠 이동을 가상으로 시뮬레이션하고, 콘텐츠추적정보 관리 방법에 대한 효율적인 동기화 오버헤드 감소와 여러 이점들을 검증하였다.

• 한국식품영양학회지
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• 제31권5호
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• pp.577-586
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• 2018

The proximate compositions, quality and physicochemical characteristics of mung-bean cultivars cultivated in the north-central region of South Korea with different seeding periods were evaluated. A significant difference was noted in the proximate compositions and chromaticity of mung-beans according to cultivars and different seeding periods. Crude ash and protein content decreased with the delay in seeding period and a slight increase in carbohydrate content was observed. Redness of the other five cultivars increased with the delay in seeding period except for the cultivar Jangan, while the yellowness decreased in cultivars Geumsung and Jangan. Water binding capacity of the $1^{st}$, $2^{nd}$ and $3^{rd}$ seeding on the cultivar Eoul was 115.15, 99.76 and 96.31%, respectively, and a decrease in the binding capacity was observed with the delay in seeding periods. Water solubility index and swelling power were significantly different among cultivars. Total polyphenol content of $1^{st}$ and $2^{nd}$ seeding on the cultivar Jangan was 8.59 and 8.57 mg GAE/g, respectively, and a decrease was observed with the delay in seeding periods except for the cultivar Sohyeon. Total flavonoid content of $1^{st}$ seeding on the cultivar Jangan was 5.25 mg CE/g, which decreased with the delay in seeding periods. DPPH radical scavenging activity of $1^{st}$ seeding on the cultivars Geumsung and Kyungseon was 2.44 and 2.32 mg TE/g, respectively, which decreased with the delay in seeding periods. The BTS radical scavenging activity of $1^{st}$ seeding on the cultivar Jangan was 6.98 mg TE/g. In the present study, the variations in phenol content and radical scavenging activity were observed to be dependent on the cultivars and seeding periods.

• 한국식품영양학회지
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• 제35권6호
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• pp.435-444
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• 2022

In vitro digestibility and protein digestibility corrected amino acid scores (PDCAAS) were investigated to verify the availability of protein in various Rhizopus oligosporus fermented products of domestic soybean (Glycine max L.) cultivars. Danbaegkong (DBK), Daepung (DP), Daewonkong (DWK), Saedanbaek (SDB), Seonyu (SY), and Cheongja4ho (CJ4) were used as raw samples, which were fermented using commercially available Rhizopus oligosporus for 48 h. All cultivars showed increased crude protein content after fermentation. The crude protein content of DBK and SDB was significantly higher than that of the other samples (55.12% in DBK and 54.22% in SDB) (p<0.001). CJ4 had the highest alanine content of 28.88 mg/g (p<0.001), and no significant difference in cysteine content was detected among the cultivars. In most of the fermented samples, the in vitro digestibility was 0.9 or higher, indicating high protein in the fermented samples. However, it is considered that restrictions on digestion are low. In DWK, the amino acid content and PDCAAS, which together indicate protein quality, were 0.917 and 0.855, respectively, confirming that it was the best cultivar to provide the raw material for fermentation. In conclusion Rhizopus oligosporus fermented soybean products can be considered a prospective source of protein with high utility value.

• 대한인간공학회지
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• 제34권5호
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• pp.377-399
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• 2015

Objective: The aim of this study is to understand and identify the critical issues in vision research area using content analysis and network analysis. Background: Vision, the most influential factor in information processing, has been studied in a wide range of area. As studies on vision are dispersed across a broad area of research and the number of published researches is ever increasing, a bibliometric analysis towards literature would assist researchers in understanding and identifying critical issues in their research. Method: In this study, content and network analysis were applied on the meta-data of literatures collected using three search keywords: 'visual search', 'eye movement', and 'eye tracking'. Results: Content analysis focuses on extracting meaningful information from the text, deducting seven categories of research area; 'stimuli and task', 'condition', 'measures', 'participants', 'eye movement behavior', 'biological system', and 'cognitive process'. Network analysis extracts relational aspect of research areas, presenting characteristics of sub-groups identified by community detection algorithm. Conclusion: Using these methods, studies on vision were quantitatively analyzed and the results helped understand the overall relation between concepts and keywords. Application: The results of this study suggests that the use of content and network analysis helps identifying not only trends of specific research areas but also the relational aspects of each research issue while minimizing researchers' bias. Moreover, the investigated structural relationship would help identify the interrelated subjects from a macroscopic view.

• The Korean Journal of Ecology
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• 제10권1호
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• pp.7-16
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• 1987

The content of Pb and Cd in the soil, producer, 1st consumer and 2nd consumer by the distance from two highway with different construction years and traffic volumes was measured from 1984 through 1986. The result was compared with that of a control in Yangsu-ri near Mt. Unak, Namyangju-gun, Kyunggi-do. The producers in the area of Yangjae-done are composed of 27 species of floras with Glycine soja being the dominant species while those in Shingal 20 species, with Leesia japonica being the dominant species. The faunas in the former area include 37 families and 69 species, with insects being dominant. In the area of Yangjae-dong, the biomass by trophic levels increased from the ration of 1/400 between producer and 1st consumer to the ratio of 1/10 between 1st consumer and 2nd consumer. The Pb content of soil, producer, 1st consumer and 2nd consumer in Yangjae-done near the Kyungbu highway with traffic jam has the sigingacant difference of 1% level at the vicinity of 10 meters and it is the same with that of Shingal area nearthe Youngdong highway with relatively sparse traffic except for the 2nd consumer. In case of cadmium content, the 1st and 2nd consumer has 1% signigicant difference near the Kyungbu highway and other trophic levels have no diference. Besides, the content of Pb and Cd at the site 1, 2 and 3 within the range of 100 meters from the two highways has 1% significant difference from that of a control while the site 4 has no difference.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2019년도 춘계학술대회
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• pp.132-132
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• 2019