• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.6
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• pp.1054-1061
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• 2007

In this paper, the comparison between UPML and Liao's absorbing boundary condition in the FDTD(Finite-Difference Time-Domain) method was performed for the analysis of the 2D cylindrical coordinate system. Generally, it is known as the absorbing characteristics of the UPML is bro than Liao's absorbing boundary condition in the 2D rectangular coordinate. The simulation results in this paper showed that Liao's original absorbing boundary condition is better than other two absorbing boundary conditions, Liao's modified condition and UPML. We concluded that more numerical, theoretical studies, simulations and verifications for various absorbing boundary conditions will be needed to get more accurate results for the design of useful 2D cylindrical microwave circuits.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.1
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• pp.273-278
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• 2013

Recently, user authentication schemes using smart cards for multi-server environment have been proposed for practical applications. In 2009, Liao-Wang proposed a secure dynamic ID based remote user authentication scheme for multi-server environment that can withstand the various possible attacks and provide user anonymity. In this paper, we analyze the security of Liao-Wang's scheme, and we show that Liao-Wang's scheme is still insecure against the forgery attack, the password guessing attack, the session key attack, and the insider attack. In addition, Liao-Wang's scheme does not provide user anonymity between the user and the server.

• Acta Via Serica
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• v.6 no.2
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• pp.37-60
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• 2021

Before the tenth century, the dress of elite women in and around China often reflected "Han" Chinese fashions and preferences. In funerary paintings and relief sculptures of Sogdian and Xianbei couples from the sixth century, for example, women wear "Han" Chinese-style clothing. Even in the Tang dynasty (ca. 618-907), when exchange with Central Asia via overland Silk Road trade impacted the styles and patterning of elite dress and men incorporated clear Central Asian attributes into their dress, elite women in the Tang sphere wore recognizably Tang fashions. Chinese-style dress in these centuries clearly conveyed cultural import and, likely, political power, especially after the founding of the Tang dynasty. However, the straightforward borrowing of Tang women's dress shifted in the Khitan Liao dynasty (ca. 907-1125). The Liao, in contrast to other states that shared a border with China in previous centuries, saw themselves as political equals to the Song dynasty (ca. 960-1278) court in the south. The Liao court was interested in Song customs and culture and incorporated artistic motifs and practices from the Song court. However, the Liao courtly idiom was never fully subsumed into the greater world of the Song - rather, the Liao used facets of Song courtly culture for their own ends. One way this is manifested is through the dual administrative system, a bureaucratic organization that, among other things, regulated and distinguished between who was permitted to wear Khitan and non-Khitan dress. In this paper, I will examine the material evidence from funerary contexts for how the dress of elite Liao women both engaged with the dress of the Song, while also maintaining a certain amount of cultural autonomy. Through their dress, elite Liao women signaled clear messages about their status, identity, and difference to their Song counterparts.

• 제어로봇시스템학회:학술대회논문집
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• 2002.10a
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• pp.55.6-55
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• 2002

Huafei Liao is a graduate student of the Automation department in Tsinghua University, China. His research involves computer-aided process planning, 3D CAD/CAM, virtual reality, and feature recognition.

• Acta Via Serica
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• v.6 no.1
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• pp.141-164
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• 2021

The Khitans were a Turco-Mongol clan who dominated China north of the Yangtze River during the early mediaeval period. They adopted and then adapted many of the cultural traditions of their powerful neighbours to the south, the Song Chinese. However, before their absorption into the Mongol Empire in the late 13^th century they proved pivotal, firstly in the eastward expansion of the armies of Chinggis Khan, secondly, in the survival of the Persian heartlands after the Mongol invasions of the 1220s and thirdly, in the revival and integration of the polity of Iran into the Chinggisid Empire. Da Liao, the Khitans, the Qara Khitai, names which have served this clan well, strengthened and invigorated the hosts which harboured them. The Liao willingly assimilated into the Chinggisid Empire of whose formation they had been an integral agent and in doing so they also surrendered their identity but not their history. Recent scholarship is now unearthing and recognising their proud legacy and distinct identity. Michal Biran placed the Khitans irrevocably and centrally in mediaeval Asian history and this study emphasises their role in the establishment of the Mongol Empire.

• Publications of The Korean Astronomical Society
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• v.30 no.1
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• pp.1-9
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• 2015

The National Foundation Day of Korea (개천절, 開天節) is currently celebrated on October 3 in Gregorian calendar. We review the history of dating the National Foundation Day of Korea and make a suggestion that it be celebrated on October 3 in the lunar calendar. We present numerous historical records on heaven-worship rites supporting the date October 3 in the lunar calendar. It is pointed out that October 3 in the solar calendar has been adopted in 1949 by the National Assembly with the thought that the lunar calendar is inferior and behind the times. The thought originates from misunderstanding on the value of the lunar calendar and from the ignorance of importance of history and tradition. Since there are now many national holidays that follow the lunar calendar, the logic of the National Assembly in 1949 also makes no sense. We emphasize that the lunar calendar should be followed for the National Foundation Day of Korea for its historical and symbolic characteristics restoration. We also investigate the year of the foundation of the first country of Korea, Dangun Joseon. It is found that even though the majority of the literature before late 15th century recorded the beginning year of Dangun Joseon dynasty to be equal to that of Liao Dynasty (堯), it was accidentally changed to the 25th year of Liao Dynasty in 1484 through a misinterpretation of the previous records. We claim that the beginning year of Dangun Joseon should be set to that of Liao Dynasty as recorded in the original literature in the earlier days. According to the two main opinions accepted by Korea, the beginning year of Liao Dynasty was 2357 B.C. or 2333 B.C., which correspond to the year of Gap-Jin (the 41st year of the sexagenary cycle) or Mu-Jin (the 4th year of the sexagenary cycle), respectively.

• Journal of the Korea Society of Computer and Information
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• v.15 no.1
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• pp.139-147
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• 2010

A remote user authentication scheme is a two-party protocol whereby an authentication server in a distributed system confirms the identity of a remote individual logging on to the server over an untrusted, open network. In 2005, Liao et al. proposed a remote user authentication scheme using a smart card, in which users can be authenticated anonymously. Recently, Yoon et al. have discovered some security flaws in Liao et al.'s authentication scheme and proposed an improved version of this scheme to fix the security flaws. In this article, we review the improved authentication scheme by Yoon et al. and provide a security analysis on the scheme. Our analysis shows that Yoon et al.'s scheme does not guarantee not only any kind of authentication, either server-to-user authentication or user-to-server authentication but also password security. The contribution of the current work is to demonstrate these by mounting two attacks, a server impersonation attack and a user impersonation attack, and an off-line dictionary attack on Yoon et al.'s scheme. In addition, we propose the enhanced authentication scheme that eliminates the security vulnerabilities of Yoon et al.'s scheme.

• Journal of Korean Medical classics
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• v.20 no.1
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• pp.17-37
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• 2007

Basic summary of the medical administration: First of all, Liao Jin Yuan dynasties had broad cultural exchange between north and south that the two traditional medical administrations were closely linked which later formed a system that united as one. Establishment of governmental medical office and governmental medical education organization was the very first attempt in the history of the medical administration. The measure on promoting the social level of medical doctors has an important meaning on the growth of the medical field. Medical policy on prisoners was done under the new condition brought on from experience. Medicine not of China was broadly interchanged, medicine from Arab was spread throughout China, and the department on skeletal injuries and the dietary treatments had major development. At this era, under a overall expansion of politics, economy, culture and medicine, scholastic dispute on medicine triggered medical expansion.

• Journal of The Geomorphological Association of Korea
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• v.24 no.1
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• pp.51-62
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• 2017

Liao River with the largest basin area in the northeastern part of China has constructed huge floodplain along the lower reach. Especially a vast marsh was developed around estuaries and coastline near Liaodong Bay. The marsh was called as Yotaek(or Liaoze) before the modern time, which is meaningful for understanding human life since prehistorian times. By the analysis of historical documents and geomorphic data, it can be assumed that the height of Yotaek of landward boundary reached 20~30m from Heishan to Liaoyang during Han dynasty. The shoreline of 7,000 yr BP is estimated to coincide with the contour line between 20m and 30m at present. And the ancient shoreline during Christ era indicates 10m.a.s.l., which is corresponding to the seaside boundary of the Yotaek. The shoreline of Liaodong Bay was progressed seaward 30km/ka during 1000~1100 AD, while 10~40km/ka during late 19 century ~ early 20 century.

• Journal of Pharmacopuncture
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• v.4 no.1
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• pp.55-58
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• 2001