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전주완,박진오,조석주,이동진 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.3
Three species belonging to two genera of labechiid stromatoporoids are described from the Yeongheung Formation (Darriwilian, Middle Ordovician), Yeongwol Group of the Taebaeksan Basin, mid-eastern Korean Peninsula. Sixteen stromatoporoid-bearing stratigraphic intervals have been recognized in the Namgyo section. All stromatoporoids occur in the peloidal and bioclastic packstone to grainstone facies. Labechia yeongwolense sp. nov. is the dominant species, occurring throughout the lower and middle parts of the section. In contrast, Labechiella mingshankouensis is restricted to the lower-middle part and Labechiella regularis occurs mostly in the upper part of the section. The occurrence of the early labechiids in the Yeongwol Group is suggestive of a close biogeographic affinity with the Liaoning and Shandong provinces of northeastern China.
A new species of the primitive stromatoporoid Cystostroma from the Ordovician of East Asia
전주완,Qijian Li,오재룡,조석주,이동진 한국지질과학협의회 2019 Geosciences Journal Vol.23 No.4
A new species of the most primitive rosenellid stromatoporoid Cystostroma, C. primordia sp. nov. is reported from the Hunghuayuan Formation (Lower Ordovician, Floian) of Guizhou Province in the South China Block and the Duwibong Formation (Middle Ordovician, Darriwilian) of the Taebaeksan Basin in mid-eastern Korea (North China Block). This species is the first representative of the genus found in both the North and South China blocks. Cystostroma primordia sp. nov. is characterized by the absence of denticles and distinctively smaller cyst plates (height 0.04–0.20 mm, length 0.09–0.39 mm) than any other known species of Cystostroma. The presence of C. primordia sp. nov. in Lower to Middle Ordovician strata of western Gondwana challenges the long-held view of the late Middle Ordovician emergence of Paleozoic stromatoporoids. The simple internal morphological features of this new species and its occurrence in the Lower Ordovician of South China strongly indicate that an Early Ordovician Cystostroma-type precursor from western Gondwana is located near the base of the stromatoporoid stock. This occurrence greatly preceded the late Middle Ordovician (late Darriwilian) stromatoporoid diversification in circum-equatorial regions worldwide.
Nylon 6-ran-Nylon 4 공중합물 섬유의 구조와 물성 (I)
조현혹,전주완,이민희,이선희,권순택,Cho, Hyun-Hok,Jeon, Ju-Wan,Lee, Min-Hee,Lee, Sun-Hee,Kwon, Soon-Taek 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.3
The effects of drawing on the structure and physical properties of nylon 6-ran-nylon 4 copolymer filaments were assessed by uniaxially drawing filaments at various ratios at 90 DC and measuring their crystal structure, birefringence, moisture regain, dynamic viscoelasticity, thermal behavior, and tensile properties. X-ray diffraction curves showed sharper peaks with increasing draw ratio. Birefringence and heats of fusion (${\Delta}H_m$) increased with increasing draw ratio, while a slight decrease in moisture regain was observed. The intensity of the $tan{\delta}$ peak decreased and its position shifted towards higher temperatures with increasing draw ratio. Breaking strength increased and breaking elongation decreased with increasing draw ratio.
오영주,정직한,이미리내,전주완,이승배,박태윤 한국지질과학협의회 2023 Geosciences Journal Vol.27 No.6
The tectonic affinity of the Korean Peninsula in reference to the Permo-Triassic collision of the Sino-Korean Craton (SKC) and the South China Craton (SCC) has been in the center of debates over the last three decades. Since the Imjingang Belt that runs through the middle part of the Korean Peninsula is thought to represent the major tectonic boundary, most part of North Korea, including the “Pyeongnam Basin” in the southern part, has been regarded as part of the SKC. However, differences in stratigraphy and the fossil occurrence have been recognized by local geologists between the southern part of “the Pyeongnam Basin” (SPB) and the northern part of the “Pyeongnam Basin” (NPB), and which have hardly been considered for the paleogeographical affinity of the regions so far. Here we provide a comprehensive review on 1,072 fossil taxa from the Neoproterozoic to middle Paleozoic sedimentary successions of North Korea, and utilize the data for determining tectonic affinity of the regions. Especailly, Cambrian trilobite genera from the SPB and NPB have been quantitatively compared with those of North China (the SKC) and the SCC, using similarity indices, the non-metric multidimensional scaling (NMDS), and PerMANOVA test. The results have revealed that the SPB is tied to the SCC, not to North China (the SKC), whereas the NPB is closely related to North China. The SCC affinity of the SPB is corroborated by stratigraphical features, such as the presence of the Precambrian–Cambrian boundary and the middle Paleozoic strata, which are largely absent in the SKC. Our results demonstrate that the SPB region likely originated from to the SCC, and thus further suggest that the collisional boundary of supracrustal rocks between the SKC and the SCC in the Korean Peninsula corresponds to the boundary of the NPB and the SPB. Accordingly, the extent of the newly-defined Pyeongnam Basin is restricted to the traditional NPB region. The SPB region is included in the extent of the newly-proposed Hwanghae District, which is bounded to the east with the Imjingang Belt by the Ryesonggang Fault. The South China Craton-originated rocks of the Hwanghae District and the Imjingang Belt are collectively termed the South China-affinity terrane (SAT).
교량 및 수로 조건에 따른 선박충돌 위험도 분배모델의 적용
이성로 ( Lee Seong-lo ),배용귀 ( Bae Yong-gwi ),전주완 ( Jeon Ju-wan ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
In the standards or regulations mentioned regarding the ship collision against bridge, acceptance criterion about collapse risk is given to bridges exposed to ship collision. It recommends to distribute collision risk through moderate method as well as to determine the analysis domain considering the ship characters and local circumstance. According to the criteria collision risk should be distributed within three times of ship’s overall length which is based on historical accident data, and besides, the summation of annual frequency of all bridge components should be equal to annual frequency of entire bridge. In this study, methodological study regarding the annual frequency of between bridge components and entire bridge is preformed and its reasonable correlation is presented considering the ship characters, bridge layout, local circumstance, and so on.