• Economic and Environmental Geology
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• v.30 no.6
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• pp.603-612
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• 1997

Cretaceous sedimentary-volcanoclastic formations of the Kyeongsang Supergroup were intruded by granitic rocks in the late Cretaceous and early Tertiary. In the Euiseong and Shinryeong area, these intrusives have various compositions including gabbro, diorite，biotite granite and feldspar porphyry. Associated volcanic rocks consist of two chemically distinct types: the bimodal suite of basalt and rhyolite in the Keumseongsan caldera, and the felsic suite of andesite and rhyolite in the Sunamsan-Hwasan calderas. Most rocks are subalkaline, and follow a typical differentiation path of the calc-alkaline magma. The granitic rocks can be distinguished chemically from the volcanics by high Zr/Y ratios. Differences in Zr/Y and K/Y ratios between the two volcanic suites can be accounted for by mantle source and fractionation. Chondrite-normalized trace element abundances of granitic rocks are depleted in Th and K, whereas those of the Keumseongsan rhyolites are depleted in Sr and Ti. Rb, La and Ce is enriched in rhyolites of the Sunamsan-Hwasan calderas. $Rb-SiO_2$ and Rb-Y+Nb discrimination diagrams suggest that the intrusives and volcanics have a volcanic arc setting. K-Ar ages indicate four plutonic episodes : diorite (89 Ma), granite (66~62 Ma), granite and porphyry (55~52 Ma) and gabbro (52~45 Ma), and two volcanisms : bimodal basaltic and rhyolitic volcanism (71~66 Ma) in the Keumseongsan caldera, and felsic andesitic and rhyolitic volcanism (61~54 Ma) in the Sunamsan-Hwasan calderas. Geochemical and age data thus suggest that the igneous rocks are related to several geologic episodes during the late Cretaceous to early Tertiary.

• Mineral and Industry
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• v.16 no.1
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• pp.1-16
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• 2003

수천 년 전부터 인간생활에 이용되어온 일라이트-운모는 다른 광물자원에 비하여 사용량은 많지 않지만, 요업, 도료, 종이, 건축용 재료, 화장품 소재 및 전자부품과 전기 재료 등 여러 산업 분야에 널리 사용되고 있다. 일라이트-운모는 광물학적으로 같은 계열의 광물군임에도 불구하고 산출상태, 입도 및 용도의 차이에 따라 다른 광물자원으로 취급되고 있다. 특히 국내에서 일라이트는 용어상의 혼란과 불명확한 법정 등록광종 때문에 효율적인 자원관리와 연구개발이 곤란한 실정이다. 그러므로 일라이트를 비롯한 점토광물 자원에 대한 광업법규상의 개선과 제도적 정비가 시급히 요구된다. 국내에서 개발되고 있는 일라이트-운모의 광석 유형은 그 광물상과 산출상태에 따라 페그마타이트상 백운모, 운모편암상 백운모, 납석상 일라이트 및 점토상 일라이트로 구분된다. 일라이트와 운모는 서로 다른 용도로 사용되고, 그 용도에 따라 그 품위 및 품질 개념이 다르다. 일라이트-운모 광석의 품위 및 품질 면에서 가장 기본적인평가방식은 (1) 육안 및 편광현미경 관찰, (2) X-선회질 분석 및 (3) 화학분석인 것으로 생각된다. 특히 리트벨트법을 응용한 X-선회질 정량분석법은 일라이트의 품위를 산정하는데 유력한 수단이 될 수 있을 것으로 여겨진다. 국내 일라이트-운모 자원의 자원잠재성과 부가가치를 향상시키기 위해서는 광석에 대한 정확한 품위 평가를 바탕으로 가장 적절한 이용 분야를 모색해야 할 것으로 판단된다.

• Journal for History of Mathematics
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• v.23 no.2
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• pp.59-74
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• 2010

Though considering of philosophy of mathematics can be optional to theoretical mathematicians, that of philosophy of mathematics-education is supposed to be indispensible to mathematics-educators. So it is natural for mathematics-educators to ask what kind of philosophy might be more desirable for mathematics-education. In this context, this essay reviews two kinds of major philosophy of mathematics, Platonism and formalism. However it shows that humanism could be more plausible alternative philosophy of mathematicseducation. In the course of entailing such a result it introduces an episode of lecture for Laplace-transformation as a speculative evidence from experience.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.4 no.3
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• pp.155-158
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• 2003

The effects of Mn, V addition on the behavior of structure and the effects of cooling rate of S20C steel for use of Tn housing and valve for automotive parts have been investigated. Transformation start temperature measured from inflection point of cooling curves has been found out to decrease with increasing cooling rate and to be more sensitive to Mn contents when cooling rate is fast. It was therefore shown that the grain was refined. If there is a big compacting pressure, it is indicated that hardness becomes much greater at surface than inside.

• Spatial Information Research
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• v.11 no.4
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• pp.453-464
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• 2003

The Competitive power of the country in knowledge information can be determined that how efficiently useful knowledge and information can be circulated. Korean government established the second National GIS Master Plan, and constructed National Geographic Information Clearinghouse to the goal 'whole nation's internet circulation of the geographic information and practical use'. But every departments of government are trying to circulate their geographic information individually, And this case, consumer group should approach to several dissemination network in various routing line to get the geographic information. In fact, it is difficult to present the solution for uilified single dissemination network. It is difficult to present suitable linkage plan coinciding in special environment and characteristics of all systems. Consequently, in this study, we suggested linkage element that should consider far link with National Geographic Information Clearinghouse, and presented linkage plan by linkage target type.

• Journal of the Korean School Mathematics Society
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• v.11 no.2
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• pp.249-283
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• 2008

The purpose of the study was to investigate the definitions and concept images of Infinity and limits for high school students. In addition, the error patterns of the students were also investigated. The participants were 121 girls highschool students and survey method was used to co11ed data. Only 11 % and 5% of the participants revealed the definitions similar to the standard textbook definitions in limits of infinite sequences and infinite series respectively. The participants showed 6 types of error patterns and had more difficulties in understanding and applying concepts and properties of infinite series than those of infinite sequences.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2009.05a
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• pp.231-234
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• 2009

남성 속옷은 신체 보호의 기능이 중요하지만 운동이나 거실 생활에서 속옷노출이 일반화됨에 따라 개성과 이미지를 표현할 수 있는 패션 아이템으로 변화되고 있는 실정이다. 따라서 남성 속옷 시장에서 소비자가 원하는 감성과 이미지를 파악하고 소비자가 선호하는 감성요구에 부합하는 소재 특성이 데이터베이스로 만들어져 소비자가 원하는 속옷 제품개발이 이루어지는 시스템의 구축이 필요하다. 본 연구에서는 남성용 속옷 문양디자인 개발을 위한 목적으로 남성 트렁크 팬티용 문양의 감성 이미지를 파악하고자 하였다. 본 연구를 위하여 시판하는 트렁크 팬티 중 문양의 형태 및 크기, 색상을 달리한 50 종을 수집하였고, 이중 25 종의 트렁크 팬티용 문양 이미지에 대한 주관적 감성평가를 2009년 4 월 부산지역에 거주하는 20 대 남녀 22 명을 대상으로 실시하였다. 주관적 감성평가를 위해 직물 문양 선호도에 관한 선행연구를 바탕으로 빈번하게 출현되는 26 개의 감성 형용어를 추출하였다. 감성 형용어를 7 점 척도로 문항화하여 설문지를 구성하고 설문지와 함께 25 종의 팬티 자극물을 보고 평가하도록 하였다. 수집한 자료의 통계분석을 위해 SPSS Win 12.0을 사용하여 빈도분석, 카이제곱 검정, 요인분석 분간분석 사후분석을 실시하였다. 본 연구결과 남성용 트렁크 팬티의 문양에 관한 감성 형용에는 '고급성', '활동성', '단순성', '호화성', '성숙성'의 요인으로 요약되었으며, 문양의 고급 감성 및 활동적 스타일이 트렁크 팬티 선호도에 영향을 주는 것으로 나타났다. 또한 트렁크 팬티의 색상 및 문양 유형이 선호도에 중요한 영향을 미치는 변수로 나타났는데, 남성 트렁크 팬티에 사용될 수 있는 무채색 계열의 고급스러우면서 단순한 도형 문양 디자인의 개발이 필요하다고 하겠다.

• Journal of Elementary Mathematics Education in Korea
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• v.14 no.3
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• pp.615-631
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• 2010

Exercise is still an important method for mathematics learning and teaching, but there is only a few researches which involve the effectiveness of exercise in mathematics learning. This study is designed for giving some implications to researchers who are interested in developing mathematics exercise books for low achievers with respect to effectiveness. For this, 'Suhak-Ikhimchaek', the Korean elementary mathematics workbook, is chosen and in particular, 'multiplication number fact', one of the units of the book, is analyzed with the following respects: achievement levels of learners, arrays of exercise, the amounts and period of exercise, exercise type. Finally, this study proposes composing principles for developing exercise books for low achievers in mathematics.

• KOMUNHWA
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• no.57
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• pp.145-155
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• 2001

The Volume 64 of Dongmunsun (東文選) compiled at the beginning of Yi Dynasty carries the document of the octagonal lantern shaped pavilion compiled by Chi-won Choi, a great scholar in the late Silla Kingdom. In this paper, I showed the entire document of the

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.12 no.4
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• pp.594-599
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• 2001

The symbol rate which is the main feature of NRZ information signal is detected by DAM (Delay-And-Multiplier) receiver. It is important for secure communication to reduce the normalized output SNR which is calculated at the DAM output as a measure of detectability. In this paper, we use the signal which is modulated by the class of MSK modulation schemes as the input signal of the DAM receiver for analyzing LPI performance and the GMSK(BT=0.3) used in GSM system is highlighted. Consequently, GMSK which has better bandwidth efficiency than other modulation schemes(BPSK, QPSK, OQPSK, and MSK) has better LPI performance compared with other ones. To compare the performances of each modulation scheme fairly, the transmitted powers of each system are set to be same within useful bandwidth.