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안상철(Ahn Sang-Cheol),이주희(Juhee Lee) 한국음운론학회 2008 음성·음운·형태론 연구 Vol.14 No.1
This paper examines the loanword adaptation patterns for laryngeal features in English, Thai and Korean. To this end, we observe how the English laryngeal features are adapted in Thai and Korean, and move on to the adaptation pattern of Thai words in Korean. Certain points are shared while others show disparities among these three languages. English and Korean belong to the aspiration type(Ahn & Iverson 2004), while Thai has the voicing distinction which Korean lacks. Furthermore, both Korean and Thai show three-way laryngeal contrast in stops. In this paper, we will claim that the loan adaptation of laryngeal features heavily depends on the language typology. More specifically, we argue that the phonemic vs. phonetic mapping patterns can be decided based on the laryngeal typology of the target and the recipient languages.
안상철(Sang-Chul Ahn),김용희(Yong-Hee Kim),정훈(Hoon Jung),정천석(Chun-Suk Jung) 한국전자파학회 2008 한국전자파학회논문지 Vol.19 No.3
본 논문에서는 UWB 통신 시스템에서 사용될 수 있는 CPW 급전을 이용한 새로운 육각 슬롯 구조를 가지는 UWB 안테나를 제안하였다. 제안된 안테나는 임피던스 대역폭을 넓히기 위해서 육각 패치(patch)를 가진다. 또한 IEEE 802.11a 대역과 상호 간섭 문제를 피하기 위해서 패치 위에 다각형 슬롯을 삽입하였다. 제안된 안테나는 유전율이 4.7이며, 두께가 1.6 ㎜인 FR-4 기판으로 제작하였으며, VSWR 특성과 그룹딜레이를 측정하였다. 제작된 안테나는 IEEE 802.11a 대역을 제외하고는 4 dBi의 이득 변화량을 나타내었다. This paper suggests a CPW-fed UWB antenna with new hexagonal slot. To increase the impedance bandwidth of an antenna, the proposed antenna is designed with the hexagonal patch. Polygonal slot is inserted in the hexagonal patch to avoid interference with IEEE 802.11a. The proposed antenna was fabricated on FR-4 substrate with a relative dielectric constant 4.7 and thickness of 1.6 ㎜ and measured for VSWR Characteristic and group delay. The fabricated antenna shows that the gain flatness is 4 dBi except at the band for IEEE 802.11a.
안상철(Sang-Chul Ahn),권욱현(Wook-Hyun Kwon) 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
The inference of fuzzy controller can be considered a mapping from the controller input to membership value. The membership value, a kind of weight, has a role to decide if the input is appropriate to the rule. The membership function is described by several values, which are decided by a learning method. The learning method is adopted from adaptive filtering theory. The simulation shows the proposed fuzzy controller can learn linear and nonlinear functions. The structure of the proposed fuzzy controller becomes a kind of neural network.
안상철 ( Sang Cheol Ahn ) 경희대학교 언어연구소 2006 언어연구 Vol.23 No.1
In this paper, I will introduce the characteristics of OT-CC, a new version of Optimality Theory(McCarthy 2006) and then discuss the merits and perspectives of this new proposal. To this end, I will first compare the outline of OT-CC with that of the "classic" OT (Prince & Smolensky 1993, McCarthy & Prince 1995, Benua 1997, etc.). I will then show the merits of OT-CC in analyzing of several long-standing problems, such as impossible mapping and opacity. Here, it will be shown how we incorporate the derivational steps (such as candidate chains) into the framework of Optimality Theory. Finally, I will discuss the possible perspectives of this theory in comparison with other versions of OT, such as Derivational OT (Rubach 2000a, b, 2003a, b) and a cyclic version of OT (Ahn 2006a,b).