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고속도로 하부 횡단 배수시설로 사용되는 파형 플래스틱 관의 덮개 요건
Kang, Junsuk,James S. Davidson,Lim, Jeong-Hyeon,Kang, Young Jong 한국복합신소재구조학회 2013 복합신소재구조학회논문집 Vol.4 No.1
This project investigated the use of two types of thermoplastic pipes, High-Density Polyethylene (HDPE) and Poly-vinyl Chloride (PVC), as cross-drains under highways. Pipes ranging from 0.3 m (12 in.) to 1.5 m (60 in.) in diameter were evaluated under deep fills, minimum cover, and construction loads. In addition to a comprehensive literature review, an analytical study into the allowable fill heights for thermoplastic pipes and a field study to observe the installation and performance of the pipe in service conditions were conducted. Based on the study findings, recommendations regarding how and when thermoplastic pipe should be installed are provided.
가강현 ( Kang-hyeon Ka ),김수연 ( Suyeon Kim ),박미정 ( Mi-jeong Park ),정연석 ( Yeun Sug Jeong ),유림 ( Rhim Ryoo ),장영선 ( Yeongseon Jang ),최종운 ( Jong-woon Choi ),김성환 ( Seong Hwan Kim ) 한국균학회 2021 韓國菌學會誌 Vol.49 No.3
Wolfiporia cocos is an important medicinal fungus that has been used in regions of Northeast Asia including Korea, Japan, and China. W. cocos is classified in Korea into two types (red bokryeong and white bokryeong) based on the internal colors (yellow orange-pale pink and white) of the sclerotium. Generally, the W. cocos type cultivated on farms produces white sclerotium. In this study, we endeavored to select strains that form sclerotium in sawdust medium using 2-way cross-breeding among two cultivated strains and three wild strains. Monospores were isolated from the fruiting bodies of cultivated and wild strains on potato dextrose agar. Thirty-nine strains of 338 hybrid strains isolated formed sclerotia with white or yellow colors upon culture for 3 months in Pinus densiflora sawdust medium. Selection for sclerotium forming strains using sawdust culture follows a very simple and easy procedure that is presented for the first time in this paper. We plan to test selected strains in the field to aid in developing new varieties for the future.