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Taylor 다항식에 의한 선형 시변 시스템의 효과적인 해석
이해영,변증남,Lee, Hai-Young,Bien, Zeung-Nam 대한전자공학회 1988 전자공학회논문지 Vol. No.
본 논문의 Taylor 다항식에 의해 선형 시변 시스템을 해석하는 한 효과적인 방법을 제안한다. Sparis와 Mouroutsos에 의한 방법은 구해야 할 상태 벡타가 닫혀진 형태(closed form)로 구해지지 않고 또한 사용하는 항이 증가할 때 큰 차원의 선형 대수 방정식을 출어야 하는 문제점을 가지고 있다. 반면에 본 논문에서 제안된 방법은 상태 벡타가 닫혀진 형태로 구해지며 선형 대수 방정식을 풀 필요가 없다. This paper presents an efficient method of analyzing linear time-varying systems via Taylor polynomials. While the approach suggested by Sparis and Mouroutsos gives an implicit form for unknown state vector and requires to solve a linear algebraic equation with large dimension when the number of terms increases, the method proposed in this paper shows an explicit form and has no need to solve any linear algebraic equation.
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[Invited Paper] 기판집적 도파관(SIW)을 기반으로 하는 고효율 능동 위상 배열안테나
이해영(Hai-Young Lee) 한국전자파학회 2015 한국전자파학회논문지 Vol.26 No.3
저손실, 전자기 완전차폐, 고전력 특성을 갖는 기판집적 도파관(SIW)을 이용하여 X-band 8×16 이중편파 능동 위상 배열안테나 시스템을 구현하였다. 16-way SIW 전력분배 네트워크의 측정된 순수 삽입손실(0.65 dB)은 마이크로스트립 경우보다 1 dB 감소하였으며, SIW 부배열(1×16) 안테나 소자의 측정된 방사효율(73 %)은 약 2배(3 dB) 향상되었다. 이러한 SIW를 이용한 분배손실과 방사효율의 상당한 개선은 능동 위상 배열안테나 시스템에서 고전력 증폭기의 최대출력(P1 dB)을 저감하고, 총 전력소모를 약 30 % 절감할 것이다. SIW 기반으로 제작된 X-band 8×16 이중편파 능동 위상 배열안테나 시스템을 이론적인 제어벡터만을 생성하여 0도, 5도, 9도, 18도의 정밀한(최대편차 2도) 빔 조향을 측정하였으며, 열주기/진공 시험에서 우주환경 적합성을 확인하였다. 고효율 SIW 배열안테나 시스템은 고성능 레이더는 물론 차세대 무선통신(5G)을 위한 Massive MIMO와 다양한 밀리미터파 통신시스템(60 GHz WPAN, 77 GHz 자동차 레이더, 초고속 디지털 전송시스템 등)에 매우 유용할 것으로 기대한다. An X-band 8×16 dual-polarized active phased array antenna system has been implemented based on the substrate integrated waveguide(SIW) technology having low propagation loss, complete EM shielding, and high power handling characteristics. Compared with the microstrip case, 1 dB less is the measured insertion loss(0.65 dB) of the 16-way SIW power distribution network and doubled(3 dB improved) is the measured radiation efficiency(73 %) of the SIW sub-array(1×16) antenna element. These significant improvements of the power division loss and the radiation efficiency using the SIW, save more than 30 % of the total power consumption, in the active phased array antenna systems, through substantial reduction of the maximum output power(P1 dB) of the high power amplifiers. Using the X-band 8×16 dual-polarized active phased array antenna system fabricated by the SIW technology, the main radiation beam has been steered by 0, 5, 9, and 18 degrees in the accuracy of 2 degree maximum deviation by simply generating the theoretical control vectors. Performing thermal cycle and vacuum tests, we have found that the SIW array antenna system be eligible for the space environment qualification. We expect that the high efficiency SIW array antenna system be very effective for high performance radar systems, massive MIMO for 5G mobile systems, and various millimeter-wave systems(60 GHz WPAN, 77 GHz automotive radars, high speed digital transmission systems).
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이해영 ( Hai Young Lee ),황선영 ( Sun Young Hwang ),하지혜 ( Jee Hye Ha ) 한국화법학회 2015 화법연구 Vol.0 No.29
This study examines the awareness and perceptions of intermediate to advanced level. Thai learners of Korean compared to native Korean speakers, with regard to the differences between male and female utterances and utterable genderlects. The research questions are as follows: (1) Do Thai learners, compared to Korean native speakers, make different judgments regarding Korean utterable genderlects and perceiving the attitude? (2) Is Thai learners’ understanding of the obviousness of gender preferences in utterances different to that of Korean speakers? In this study, samples of utterable genderlects were extracted from the categories of phonemes, vocabulary, grammar, and pragmatics. The data were analyzed using a frequency analysis and chi-squared test. The analysis showed that the highest deviation between Thai learners and native Korean speakers was in the category of pragmatics, implying that pragmatics is the most challenging aspect of acquiring utterable genderlects. Moreover, Thai learners were, in general, well-aware of utterable genderlects with more obvious gender preferences, especially female utterances. Therefore, it can be said thatThai learners are not uniformly different from native Korean speakers in understanding utterable genderlects. Results from such studies should be reflected in the field of Korean language education.
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이해영(Hai Young Lee) 한국어학회 2011 한국어학 Vol.53 No.-
The studies on Korean modality expressions have drawn much attention recently. However, the most of them have taken synchronic research methods which led the error analysis or contrastive analysis perspectives. The current study begun with the question how the L2 learners of Korean express the modal meaning not knowing the grammatical modal expressions. This study analyzed how 27 vietnamese learners of Korean acquire their modal expression. Our primary observation has been made on how these learners coped with their lack of grammatical knowledge and how this problem had been solved as they developed their interlanguage. The learners participated in 3 experiments over a 3-month time interval which were conducted for 6 months. I used the both of qualitative and quantitative methods according to the research questions. The proficiency test, survey, and interview were used to elicitate the data.
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『세종학당용 초급 한국어 표준교재』의 단원모형 개발 연구
이해영 ( Hai Young Lee ),박선희 ( Sun Hee Park ),최은지 ( Eun Ji Choi ) 이중언어학회 2011 이중언어학 Vol.46 No.-
The Sejonghakdang has constructed itself as a merging and cultivating institute for Korean language education in and out of Korea. However, the continual needs have arisen from the lack of adequate and suitable textbooks for the institute. The National Institute of the Korean Language launched the textbook development project to meet these needs in 2011. This paper aimed to report how this project had developed the units of the textbook, ``Korean Language Textbook for Sejonghakdang: Beginner level``(tentative title). It has been based on the analysis of the current curriculum and teaching-learning situation of the Sejonghakdang. Since the regular beginner level courses at the Sejonghakdang are operated on 4 hour session per week for 2 semesters(30 weeks), 29 units in total have been developed. The primary components of the unit are composed of 5 parts such as 2 Dialogues, Listening & Speaking, Reading & Writing, and Culture, each of which has theoretical basis on ``International Standard Curriculum for Korean language education``. The two Dialogues have sub components such as Vocabulary, Grammar, Activity 1 and Activity 2, which correspond to the Language Knowledge component of the Standard Curriculum. The integrated Listening & Speaking and Reading & Writing components also correspond to the Language Use component of the Standard Curriculum. The 8 Culture items were included as suggested in the Standard Curriculum.
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