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인공지반녹화용 멤브레인 방수 및 방근재료의 방근성능 평가 방법 제안 연구
오상근(Oh Sang-Keun),김영근(Kim Youn-Geun),신주재(Shin Ju-Jea),김현수(Kim Hyeon-Soo),권시원(Kwon Shi-Won) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.11
The purpose of this paper is to propose a standard test methods of resistance to root penetration for waterproofing and rootproofing membrane using green roof system. Green roof system is considered to be an important subject in construction industry for green growth project. At the same time, we have to consider the counterplan for protection the damage of waterproofing layer and concrete substrate from the penetration of plant root. But many kinds of materials for protection from root penetration are using in construction field. But the performance of those materials is not clear, and there is not test methods for the evaluation of performance. So in this paper, based on the research results of 4 institutes during four years and foreign cases, we made a standard test methods of resistance to root penetration for waterproofing and rootproofing membrane using green roof system. This test method deals with about environmental condition of laboratory, experimental facilities, kinds of plant, specimen of test , management methods, evaluation duration and documents, etc.
김영근(Kim Young-Geun),오상근(Oh Sang-Keun),박봉규(Park Bong-Kyu) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.9
As a result of testing the material characteristics of cement-polymer modified waterproof coatings, the polymer (base resin) was found to be acrylic resin and poly vinyl acetate(PVAC) dispersion and the inorganic powder was composed of sand, Portland cement, and Alumina cement as well as the complementary functional additives such as antifoamer, fluiding agent, and anti-cracking agent. <br/> For the waterproofing characteristics testing on items specified by KS F 4919, company D has shown unsatisfactory result for tensile strength, elongation and tear resistance requirements, but company A, B, and C have shown acceptable result for all quality standards.<br/> The durability requirements for the waterproofing materials are as follows:<br/> 1) For the chisel impact resistance test, only company D has showed very poor result resulting in hole or complete intrusion.<br/> 2) For cracking resistance test, only company B and C has passed the test at the ambient temperature and for the temperature range between -10℃ and -20℃, all companies did not show acceptable cracking resistance.<br/> 3) All test materials were broken apart during low temperature flex-resistance and crack bridging tests. <br/> 4) Company B and C has passed the acid resistance test and company A and D exhibited the color change and decoloration.<br/> 5) For Alkali resistance and salt water resistance tests, there was no abnormality on the exterior and showed the similar result as in acid resistance tests.<br/> 6) For the water-vapor permeability test with the application thickness of 2mm, Sd value was found to be 5.0~6.8㎜ indicating low water-vapor permeability profile.<br/> 7) As the result of CO₂gas permeability resistance test, CO₂gas has been absorbed up to 5mm into the standard test material and when the waterproofing material is applied on the substrate, none of the test materials showed the sign of CO₂gas absorption. <br/> As the result of testing the currently available commercial cement-polymer modified waterproof coatings, all items satisfied the impact resistance, CO₂gas permeability resistance and other test categories specified by KS standard except company D. However, all companies has failed to meet the cracking resistance, low-temp flex. resistance, crack bridging, and water-vapor permeability requirements. Therefore, it is considerably important to develop new products with proper durability and revise the relevant requirements of KS standards.
꼬치동자개 Pseudobagrus brevicorpus 인공종묘의 성분화 과정
오민기 ( Min Ki Oh ),박종영 ( Jong Young Park ),강언종 ( Eon Jong Kang ),양상근 ( Sang Geun Yang ),김응오 ( Eung Oh Kim ),조용철 ( Yong Cheol Jo ) 한국어류학회 2008 韓國魚類學會誌 Vol.20 No.4
멸종위기야생동식물 1급으로 지정된 꼬치동자개, Pseudobagrus brevicorpus의 종복원을 위해 인위적인 교배를 통하여 획득한 자치어를 대상으로 성분화 과정을 조사하여 성적임성 여부를 확인하였다. 부화 후 4~5일째 자어에서 생식융기 1쌍이 장과 중신관 사이에서 관찰되었고, 그 후 유사분열이 활발히 진행되었다. 부화 후 20일째 치어에서 난원세포의 출현으로 난소 분화가 시작되었으며, 부화 후 30~40일째를 거치면서 염색인기와 주변인기의 난모세포로 성장하였다. 난황은 부화 후 80일째의 자어에서 생성되기 시작하였고, 부화 후 100일째가 되어 eosin에 염색되는 난황구가 생성되었다. 이후 난모세포는 난황이 지속적으로 축적되면서 세포의 크기와 수가증가하기 시작하였고, 부화 후 약 10개월째에는 난막과 여포세포층에 의해 둘러싸여진 난모세포로 분화하였다. 한편 정소는 부화 후 25일경 치어에서 분화되기 시작하였고, 40일경 유사분열을 통해 정원세포를 둘러싸는 포낭을 형성하였다. 부화 후 100일째가 되면 정소는 정소엽 구조를 형성하였고 hematoxylin에 매우 진하게 염색되는 정모세포로 분화하였다. 부화 후 7개월째 치어의 정소엽 내부에 정세포가 출현한 이후, 부화 후 만 1년을 경과한 치어에서 최초로 성숙한 정자가 출현하였다. 위 결과를 바탕으로 인공적으로 부화된 꼬치동자개 자치어의 성분화는 다른 종에서 보이는 것과 같이 정상적인 발달을 보인다고 판단되었다. The endemic Korean stumpy bullhead Pseudobagrus brevicorpus is a first-grade endangered wild fish as designated by the Ministry of Environment of Korea. As part of its restoration and proliferation effort, a histological study of this fish was carried out to investigate sex differentiation and gonadal development based on F1 generation individuals obtained by artificial breeding. On days 4~5 after hatching, a pair of genital ridges including clusters of primordial germ cells was observed between the gut and the mesonephric duct. On days 20 after hatching, the ovary began to initially differentiate and contained early oocytes with chromatin-nucleolus and peri-nucleolus stages on days 30~40 after hatching. As yolk material accumulated after day 80 from hatching, the oocytes grew increasingly large and were surrounded by a distinct follicular layer. On days 306 after hatching, the oocytes grew toward a mature ovum. In the males, the testis was distinguished by emergence of spermatogonium cells on 25 days after hatching, and day 40 after hatching it contained a small number of seminal lobes forming cysts. From 173 days after hatching, the testis consisted of numerous enlarged seminal lobes including spermatocytes and spermatids. Over 14 months after hatching, some seminal lumens were filled with spermatozoa.