• Title/Summary/Keyword: AAG

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The Structure of Oriental Wooden Pagoda (동양목조탑파(東洋木造塔婆)의 구조형식(構造形式)에 관한 연구(硏究) - 법주사(法住寺) 팔상전(捌相殿)과 법륭사(法隆寺) 오중탑(五重塔)의 비교분석적 측면에서 -)

  • Kim, Kyeong-Pyo;Fujii, Keisuke;Lee, Min-Sup
    • Journal of architectural history
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    • v.1 no.1 s.1
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    • pp.88-105
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    • 1992
  • This dissertation aims to investigate the structure of Palsangjeon, a five story wooden pagoda in Pubjoo Temple which is the only wooden pagoda existing in Korea, by a comparative study of the Palsangjeon with Japanese counterparts. By doing so, the writer of the present investigation attempts to find out its structural originality. The main finding of this study are as follows. The upper part of Palsangjeon is constructed with square log frameworks called GuiTl and Sacheon-Ju around the central column. The four walls along Sacheon-Ju from the 1st level to the 3rd well resists the outside horizontal piressure. And Gui-Tl structure on the 5th level copes much better with shear force. So this frame consisting of Sacheon-Ju and log frameworks might be viewed an semi-core system, This core is supported once again by the frame of Go-Ju. That is to say. Go-Ju supports frame of Sacheon-Ju. And the frame of Pyeong-Ju on the 4th and the 5th levels also supports it. The frame of Go-Ju is supported by the frame of Pyeong-Ju on the 1st and the 2nd levels. So this structure is designed to resist the wind and also keep the balance by properly distributing vertical pressure. The plan and the elevational structure of Palsangjeon keep the balance by the perfect symmetric structure. And the frame of Sacheon-Ju forming semi-core system can resist both the lateral load and the vertical pressure for the balance of its structure. The five story pagoda in Horyuji used to stand on a central which is desigend to support the main body of the pagoda from the first level. The principles of balance is used between the Ha-Aag and short to react the rafter. Sacheon-Ju and edge column is against the lateral load. The structural jointing system is stable thanks to the log framewroks formed on every level. The five story pagoda in Horyuji poseses the structual system originated from the ancient wooden pagoda. The pagoda is found to express simple, sincere and straight forward form. On the other hand, it could be seen as a stucture resisting the earthquake and the lateral load, Palsangjeon is an excellent building which religions function is well harmonized with its structure and appearance. It not only functions extremely well as a regions place like other pagodas, but also excellently shows how multi-story wooden building should be structured.

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Renaissance of Geographic Education in the United States since 1980: Its Dynamic Process and Implications to Geographic Education in Korea (1980년대 이후 美國 地理敎育 復興運動의 展開過程과 그 示唆點: 地理學, 地理敎育, 그리고 敎育政策의 關係)

  • Seo, Tae-Yeol
    • Journal of the Korean Geographical Society
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    • v.28 no.2
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    • pp.163-178
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    • 1993
  • The purpose of this paper is to provide a better understanding of the unprecedented reform movement of geographic education in the United States since 1980 and extract some implications from this movement for geographic education in Korea. For the purpose, the history to this movement was reviewed through following three stages. In the first stage(1980~1984: form :HSGP" to :"Guideline"), the voluntary improvement movement appeared at California and the orgni-zational movement began in 1982 such as the Committee on Geography and International Knowledge. The national educational refrom imperatives, presented at "A Nation at Risk", and "Back to Basics" movement provided good opportunities to resurrect geography as a basic subject. For next real resurrection movement, the very important document "Guidelines for Geographic Education" was published at 1984. In the second stage(1985~1989: from "Guide-lines" to "Public"), the "Guideline" gave power-full motives and foci for reconstructiong the contents of geography, especially by the five fundamental themes(Location, Place, Relation-ships within Places, Movement, and Region). Also GENIP as the symbol of unity of all four major geography organization(AAG, NCGE, NGS, AGS) contributed to expanding and stren-gthening geography education. Also Geography Educagtion Program of NGS was a smart and well organized program to improve geographic education through it's a five strategies: Grass-roots organization(Alliances), Teacher education, Pu-blic awareness, Educational materials develo-pment, Targeted outreach to education decision-makers. In the late 1980s, the last focus of movement was the Public awareness and Edua-ction decision-making. In the third stage(1990-present: from "Public" to "Core Subject"), the initiative pendulum swung from geography organization to nation curricu-lum. In this National Curriculum, Geography was approved as a "Core Subject" and The 1994 National Geography Assessment Framework was constructed to assess the outcome of student's education in geography in grades, 4,8, and 12. Some Implications extracted from the process and contents of renaissance movement of geogr-aphic education in the Uinted States since 1980 are as follows. First, It shows the importance of the unity and target assignment among the geography organization. Second, interactive relationship between the academic geography and school geography develops each other. Third, teacher education, including pre-service education, including pre-service education and in-service education, is a key element to improve the quality of geography. And teacher organization is a good clearing house to exchange information for good geography. Forth, the positive and active response to changes in socketies such as globalism and inter-nationalizing, national education policy, and the trend of pedagogy is needed to rejuvenate geo-graphic education. Above all, we need to establish a well organized and powerfull program, sophisticated activities strategies, and long-term implementa-tion plan if we want more and better school geography.

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Adhesion Properties of Sn-3.5Ag solder on Cu, Alloy42 substrates after aging (시효 처리후 Sn-3.5Ag solder의 Cu, Alloy42 기판에서의 접합특성)

  • 김시중;김주연;배규식
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.07a
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    • pp.640-644
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    • 2000
  • The microstructure, wettability, shear strength and aging effect of Sn-3.5Ag/Cu and Alloy42 lead-frame solder joints were measured for comparison. In the case of Sn-3.5Ag/Cu, Ag$_3$Sn and Cu$\sub$6/Sn$\sub$5/ phases in the matrix Sn and 1∼2$\mu\textrm{m}$ thick Cu$\sub$6/Sn$\sub$5/ Phase at the interface of solder/lead-frame were formed. In the case of Sn-3.5AAg/A11oy42, only Ag$_3$Sn Phase of low density in the matrix Sn and 0.5∼1.5$\mu\textrm{m}$ thick FeSn$_2$phase at the interface of solder/lead-frame were formed. Comparing to Cu, Alloy42 shear strength of Alloy 42 solder joints was smaller than that of Cu and all declined after aging. After aging at 180$^{\circ}C$ for 1 week, η-Cu$\sub$6/Sn$\sub$5/ layer was formed on Cu lead-frame, while AgSn$_3$ phase in the matrix and thickened FeSn$_2$at the interface were formed on Alloy42 lead-frame.

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