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This study presents an algorithm for measuring the time‐distance accessibility based on the flow data of actual transportation networks and examines resulting accessibility distributions. Specifically, we construct an extended graph of the transportation network to take into account not only the average speed and transfer time extracted from the data set but also various possible trajectories taken via transfers. Employing the modified Floyd algorithm which finds the shortest time distance, we compute the time‐distance accessibility of every bus stop in the Seoul bus system, which yields distinctive skew distributions. We then introduce a time‐distance cutoff to focus on effective connections and probe the emergent spatial distributions as the cutoff is varied. Revealed are the characteristic scales as well as spatial structures of the system. It is suggested that the time‐distance accessibility can serve as a significant measure to describe and predict the urban land use pattern. 相似文献
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Hyungsub Choi 《History & Technology》2014,30(4):334-353
The Seoul National University Nanoelectronics Institute (SNI) was established in 1996 by an interdisciplinary team of university researchers working together to develop a practical fabrication method for ‘tera-level’ single-electron semiconductor devices. The technical and organizational experiment of the SNI ended abruptly with the Asian financial crisis of 1997 as LG Semiconductor, SNI's patron, faced difficulties. This paper places this episode within the historical context of the development of science and technology in post-liberation South Korea as it coped with the overwhelming forces of globalization since the late 1970s. As the global high-tech trade war escalated in the 1980s, the South Korean government pursued the ‘technology drive policy,’ which emphasized the importance of directed basic research in university laboratories. The increased public and private support for university research transformed a few elite universities from teaching-oriented to research-focused institutions, especially in engineering and science. The new generation of research-intensive academics spearheaded the new national strategy of leapfrogging into the cutting-edge of global technology for the first time in the nation’s modern history. 相似文献
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M. J. Kim C. S. Oh I. S. Lee B. H. Lee J. H. Choi D.‐S. Lim Y. S. Yi W.‐J. Han Y.‐S. Kim G. D. Bok S. D. Lee D. H. Shin 《International Journal of Osteoarchaeology》2008,18(6):614-623
Although all of the Korean medieval mummies found up to the present time have shown relatively well‐preserved brains, relevant biomedical information has been difficult to acquire owing to the obstacles to obtaining permission to conduct invasive investigations. However, recently we were able to secure permission to investigate, through various forms of examination including dissection, a well‐preserved brain found in a lime‐soil mixture barrier (LSMB) tomb in Yongin, Korea, because the remains found within the tomb were mostly skeletal. As in the cases of mummified brains from tombs found in other countries, the current Yongin case showed well‐preserved grey and white matter within well demarcated brain lobes, on which sulci and gyri could be identified. On histological examination, we found that the remaining brain tissue was composed mainly of lipids, which seems to correspond to the preserved myelin sheath. The present paper is the first report on the general preservation status of a mummified brain found in Korea. Moreover, because mummified brains are found quite frequently in LSMB medieval tombs, this study could provide a good basis upon which further such palaeo‐neuropathological studies can be progressed. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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Tina Young Choi 《Journal of Victorian Culture》2016,21(1):126-129
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Dong Hoon Shin Chang Seok Oh Sang Jun Lee Jong Yil Chai Jaehyup Kim Soong Deok Lee Jun Bum Park In-hwa Choi Hye Jung Lee Min Seo 《Journal of archaeological science》2011,38(12):3555-3559
A paleo-parasitological study was performed on soil samples from archaeological sites in the old district of Seoul Metropolitan City (Old Seoul City) where the capital of the Joseon Kingdom was constructed about 600 years ago. The sampling sites were the original locations of the Royal Palace Wall, Yukjo Street and the Royal Arsenal. Microscopic examinations showed that parasite eggs of Clonorchis sinensis, Diphyllobothrium latum, Ascaris sp. and Trichuris sp. remained in the soil strata, which were estimated to represent the 14th-19th centuries. We suspect that the medieval citizens of Old Seoul City, numbering around 200,000, might have been made vulnerable to parasite infection by a combination of bad hygiene, inadequate sewer system and seasonal flooding. 相似文献
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