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관매도에 분포하는 퇴적암류에 대한 퇴적암석학적 예비연구
고영구 ( Yeong Koo Koh ),나범수 ( Bum Soo Na ),윤석태 ( Seok Tai Youn ),오강호 ( Kang Ho Oh ),박성일 ( Sung Il Park ) 한국도서학회 2015 韓國島嶼硏究 Vol.27 No.3
연구지역인 관매도 주변은 전형적인 침수해안으로 만입이 심한 리아형의 해안으로 되어 있다. 관매도에 분포하는 퇴적류에 대한 퇴적암석학적 연구를 위해 두 장소의 노두가 선택되었다. 먼저, 선착장 부근 노두는 주로 1 ~ 2 m 층후의 사암층으로 이루어져 있으며 박층의 셰일층을 협재한다. 셰일층을 협재하는 이 사암층 노두는 사암과 셰일의 특징적인 호층에 기반을 두고 Ghibaudo(1992)에 의해 제안된 sSM(plane-stratified laminated sand-mud couplet) 퇴적상에 해당되는 것으로 생각된다. 한편, 곰솔해변 북쪽 해안 주변 노두는 횡적 연장과 엽층전개에 바탕을 두어 역시 Ghubaudo(1992)에 의한 상부 사암 우세 부분의 lSM(laminated sand-mud couplet)과 하부의 셰일 우세 부분의 lSM(laminated mud-sand couplet) 퇴적상에 해당시킬 수 있다. 또한, 연구노두들에서는 단층, 피소이드형 구조, 연흔, 사엽층리, 하중구조, 말린층리, 머드볼캐노 형의 퇴적암 관입체 등 여러 가지 퇴적구조들이 나타난다. 이러한 퇴적구조들과 같이 다양한 형태의 단층들도 전개된다. 퇴적구조들 중, 사엽층리, 비대칭 연흔, 셰일 플레이크 등은 저밀도 저탁류와 관련 있는 것으로 여겨진다. 그리고, meta depositional 형의 말린층리는 머드 볼캐노형의 퇴적암 관입체 및 하중구조는 퇴적물의 불안정성에 기인한 것임을 시사한다. 퇴적물의 불안정성은 노두들의 다양한 단층들의 형성과도 관련되는 것으로 추정된다. 한편, 피소이드형 구조들은 일종의 캘크리트 기원일 가능성이 있다. 이러한 사실들에 바탕을 두고 연구지역의 퇴적암류는 아열대 기후에서 계절적 변화가 있는 환경에서 퇴적되었을 것으로 생각된다. The Gwanmae do has a highly curved ria type coast forming a typical submerged shoreline. Two outcrops of sedimentary rocks were chosen from this island for the sedimentological study. The outcrop near harbor was mainly composed of sandstone beds of 1 ~ 2 m thickness intercalating with thin shale ones. Based on the characteristic alternation of sandstone and shale beds, the sandstone beds with thin shale beds were assigned to sSM(plane-stratified laminated sand-mud couplet) facies of Ghibaudo(1992). Meanwhile, outcrops around the northern coast of Gomsol seashore were assigned to lSM (laminated sand-mud couplet) of upper sandstone dominated part and lMS(laminated mud-sand couplet) of lower shale dominate part by Ghibaudo(1992), with respect to horizontal extension and lamination. The outcrops included several sedimentary structures such as the pisoid shape structure, ripple marks, crossed laminations, load structures and sedimentary dykes like the mud-volcano. With these structures several type of faults can develope in the outcrops. The sedimentary structures, crossed laminations, asymmetrical ripple marks, and shale flakes may relate to low-concentrated turbidity current. In addition, the metadepositional type convoluted beds, load structures and sedimentary dykes such as the mud-volcano indicate sediment liquefaction caused by the instability of sediments. Sedimentary instability might also form several type of faults in the outcrops while pisoid shape structures imply a calcret origin. From the above results, it is considered that sedimentary rocks of the study area were deposited under seasonal variation of semi-tropical climate.
시멘트계 재료 기반 캡슐을 사용한 자기치유 모르타르의 역학 특성
이재인 ( Lee Jae-in ),임수빈 ( Im Soo-bin ),나범수 ( Na Bum-su ),김채영 ( Kim Chae-young ),윤주호 ( Yoon Joo-hoo ),최세진 ( Choi Se-jin ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
Although concrete is a material widely used in the construction industry, it is very vulnerable to cracking and has a disadvantage in that durability deteriorates when cracks occur. When cracks occur, harmful factors are introduced through the micro-cracks of the structure, reducing durability. Therefore, in this study, as part of a study to alleviate the problems of maintenance and durability deterioration due to cracks in concrete structures, the mechanical properties of self-healing mortar according to the size of the capsule made of cement material were reviewed.
울릉도 주변 무인도서의 지형,지질,경관과 활용 및 관리 방안
윤석태 ( Seok Tai Youn ),오강호 ( Kang Ho Oh ),정철환 ( Chull Hwan Chung ),고영구 ( Yeong Koo Koh ),김해경 ( Hai Gyoung Kim ),나범수 ( Bum Soo Na ) 한국도서학회 2013 韓國島嶼硏究 Vol.25 No.3
The uninhabited islands located in the northeastern coast of Ulleungdo are composed of trachytes and volcaniclastics made by volcanic activities. The main geomorphological features of the islands are sea cliffs, sea caves, sea arches, tafoni, wave-cut platforms, tors and etc. The sea cliffs are quite steep, 50 ~ 90 degrees with sea arches and caves in their ground parts. Sea arches are seen in Gongam and Gwangeumdo, while in Gwaneumdo, Ddanbawi and Samseonam sea caves are dominant. Tafoni which is created by salt weathering appears in all the above uninhabited islands. Wave-cut platforms are located in Jaggeun-gongam(2) and Sobukjeo-bawi, tors are restricted to Samseonam, Ilseonam and Bukjeo-bawi, respectively. The above geomophlogical and geological features are related to the cooling of volcanic rocks, salt weathering, and wave action of the origin. In order to utilize the natural heritage of Ulleungdo, activating geotourism and edutourism is necessary. In addition, the local economy can develop by preserving the geological heritage, which can be helpful in attracting tourist, especially since Ulleingdo is certified as a international geopark. Unified management regarding education and tourism is essential for the effective preservation of islands. The uninhabited islands around Ulleungdo hold natural geomorphological and geological heritages and national starting points indicating territorial waters. Therefore, it is important to manage and develop natural heritages and the national territorial waters of the Ulleungdo.