이중층 패치와 부분 제거된 접지면을 이용한 광대역 평판형 역 F 안테나의 설계

이광재,이용희,강연덕,이택경,Lee, Kwang-Jae,Lee, Young-Hee,Kang, Yeon-Duk,Lee, Taek-Kyung 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.9

본 논문에서는 이중층의 패치와 제거된 접지면을 이용하여 광대역 평판형 역 F 안테나(PIFA)를 설계하였다. 제안된 안테나는 급전부를 공유하게 한 이중 층 패치의 슬릿을 통해 공진점을 조절하였고 접지면을 부분 제거하여 임피던스 정합을 개선하였다. 대역폭은 VSWR 2 이하 기준 1,492 MHz(BW: 67.7 %, 1,457${\sim}$2,949 MHz)와 VSWR 2.5 이 하 기준 1,170 MHz(BW: 21 %, 4,970${\sim}$6,140 MHz)를 얻었다. 이는 DCS 1800, DCS1900, UMTS (W-CDMA), WiBro, WLAN(IEEE 802.11b), Satellite DMB, WLAN (IEEE802.11a) 총 7개의 무선 통신 서비스를 만족한다. 방사 패턴은 전 방향에서 신호의 송수신이 가능하였고 대역 내에서 주파수별 서로 유사한 형태를 가졌다. In this paper, we proposed a wideband design of planar inverted-F antenna(PIFA) using two-layer, patches and modified ground structure. The antenna consists of two layer patches with common feed and modified ground plane to control resonance frequency and antenna input impedance. The measured bandwidth is 1,492 MHz(BW: 67.7 %, 1,457${\sim}2,949$ MHz) for VSWR<2, and 1,170 MHz(BW: 21 %, 4,970${\sim}$6,140 MHz) for VSWR<2.5. It covers service bands of DCS1800, DCS1900, UMTS(WCDMA), WiBro, WLAN(IEEE 802.11b), satellite DMB. WLAN(IEEE 802.11a) in Korea and radiation patterns shows constant figure with frequency change.

병렬 어레이 프로세싱을 위한 반집합 대수 LDPC 부호의 구성

이광재,이문호,이동민,Lee Kwang-jae,Lee Moon-ho,Lee Dong-min 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.1C

본 논문에서는 이중 대각 부행렬에 근거한 결정적 LDPC 부호의 일종인 반집합 대수 LDPC 행렬이라는 새로운 LDPC 부호의 구성을 제시한다. 이러한 구성 방법에 의해 일종의 high rate LDPC 부호를 얻게 되며, 이 부류의 부호들은 큰 girth와 양호한 최소거리 특성을 갖는다. 또한, 순환 시프트 레지스터를 이용한 단순한 병렬 어레이 구조로 구현할 수 있으며, 반복 복호에 의해 용이하게 처리될 수 있다. In this paper, we present a novel LDPC code construction called as semi-algebra low density parity check(LDPC) codes which is one kind of deterministic LDPC code based on dual-diagonal sub-matrix. The constructing method results in a class of high rate LDPC codes. Codes in this class have a large girth and good minimum distances. Furthermore, they can be implemented by simple parallel array architecture using cyclic shift register and perform well with the iterative decoding.

노인의 인지기능에 따른 동적 균형과 삶의 질에 대한 비교 연구

이광재,Lee, Kwang Jae 대한물리치료과학회 2012 대한물리치료과학회지 Vol.19 No.4

Background : The purpose of this study is to provide the basic data. Elderly cognitive identify the difference between dynamic balance and quality of life according to the performance level of the clinical exercise therapy and cognitive training. Methods : This study was conducted to collect data from October 17th in 2011 until October 28th, to target seniors who living in Yong-in, Gyeonggi-do. Results : The results of the statistical analysis according to the cognitive ability to function. Higher cognitive functions, the dynamic balance ability was higher, and higher quality of life. Also showed that the dynamic balance ability and a high quality of life to the higher cognitive functions(p<.05). Conclusion : For the maintenance and promotion of cognitive function in the elderly, physical therapy approach seems to improve the quality of life and still plays an important role, as well as the promotion of dynamic balance ability. Therefore, to improve cognitive function is thought to be the appropriate intervention methods and approaches to be developed.

키네시오 테이핑이 장 활성도에 미치는 영향

이광재,Lee, Kwang Jae 대한물리치료과학회 2013 대한물리치료과학회지 Vol.20 No.1

Background : The purpose of this study is to find out the impact of kinesio-taping method for female university students, who are vulnerable to constipation, on the activation of intestine. Methods : This study has been conducted for a total of three weeks including the pre-inspection, and it explained the purpose of the study upon selecting the adequate subjects who met the criteria for constipation among the female students. And It chose the nine students, who agreed to the experiment, as the subjects. It verified the frequency and time of excretion before experiment and the constipation ejaculation measure, and compared pre-arbitration with post-arbitration as for the time and frequency of excrement, the point of constipation ejaculation measure, etc. after two weeks since the application of tape. Result : The frequency of excrement after arbitration increased compared with pre-arbitration as result of the application of kinesio-taping method, and the time, which was taken for excrement, decreased. It was also shown that the point decreased in the point comparison for constipation ejaculation measure; thus, it obtained the result that showed the improvement of the level of constipation and all were statistically significant(p<.05). Conclusion : It is believed that kinesio-taping method has a positive impact on the activation of intestine of female university students.

전기치료와 키네시오 테이핑 요법이 테니스 엘보 환자의 통증과 악력에 미치는 영향

이광재,Lee, Kwang jae 대한물리치료과학회 2014 대한물리치료과학회지 Vol.21 No.1

Background : The purpose of this study is to identify the level of positive influence on the pain and the gripping power in patients with tennis elbow by comparing the TENS treatment method and the kinesio taping therapy with good accessibility among the kinesio taping therapy and electrical therapy. Methods : Targeting the patients diagnosed with tennis elbow, the subjects were categorized in groups of four, each of electrical therapy group and kinesio tape therapy group where the degree of pain reduction through VAS before and after the treatment of each group and the measurement of the degree of gripping power increase using the gripping power measurement tool as well as the pain reduction changes and gripping power increase before and after the treatment between the two groups were compared. Result : As a result, the electrical therapy group and the kinesio tape group were able to obtain the results of pain reduction and gripping power increase through VAS before and after the treatment, but for all pain reduction and gripping power increase, it had no statistically significant changes(p>.05). In addition, in the changes of pain reduction and changes of gripping power increase before and after the treatment, there were no statistically significant differences between the electrical therapy group and the kinesio tape group(p>.05). Conclusion : Based on the results so far, it is thought that the kinesio taping therapy can positively influence the pain reduction of patients with tennis elbow and increase of gripping power.

재킷 패턴 기반의 F-LDPC 부호

이광재,강승선,Lee, Kwang-Jae,Kang, Seung-Son 한국전자통신학회 2012 한국전자통신학회 논문지 Vol.7 No.2

본 논문에서 우리는 LDPC 부호의 부호화 문제를 고려한다. 특히 재킷 패턴과 순환 치환 행렬을 사용함으로써 리차드슨의 하삼각 행렬과 유사한 간단한 LDPC 부호를 제안한다. 이 부호화 기법은 다양한 부호율을 갖도록 확장할 수 있다. 또한 단순한 행렬 처리에 근거하여 다양한 부호율을 갖는 복잡도가 낮고 간단한 부호기를 설계할 수 있다. In this paper, we consider the encoding scheme of Low Density Parity Check codes. In particular, using the Jacket Pattern and circulant permutation matrices, we propose the simple encoding scheme of Richardson's lower triangular matrix. These encoding scheme can be extended to a flexible code rate. Based on the simple matrix process, also we can design low complex and simple encoders for the flexible code rates.

순환 치환 행렬을 이용한 ALT LDPC 부호의 설계

이광재,Lee, Kwang-Jae 한국전자통신학회 2012 한국전자통신학회 논문지 Vol.7 No.1

본 논문에서는 cycle-4를 쉽게 피하고 가변 부호율과 길이로 접근할 수 있게 하는 순환 치환 행렬(CPM; circulant permutation matrix)을 토대로 한 간단한 패리티 검사 행렬의 구성 방법을 제안한다. 결과적으로 부행렬 연산은 여러 CPM들의 곱셈으로 처리될 수 있으며 LDPC 부호화 계산은 매우 간단하게 수행된다. 또한 LDPC 부호의 고속 부호화 문제를 고려한다. 제안한 설계는 정규, 비정규 LDPC 부호 둘 다를 위한 간단한 행렬 연산에 근거한 고속 부호화를 가능하게 한다. In this paper, we propose a simple H parity check matrix from the CPM(circulant permutation matrix), which can easily avoid the cycle-4, and approach to flexible code rates and lengths. As a result, the operations of the submatrices will become the multiplications between several CPMs, the calculations of the LDPC(low density parity check) encoding could be simplest. Also we consider the fast encoding problem for LDPC codes. The proposed constructions could lead to fast encoding based on the simplest matrices operations for both regular and irregular LDPC codes.

저밀도 부호의 고속 부호화 알고리즘

이광재,손영수,Lee, Kwang-Jae,Son, Young-Su 한국전자통신학회 2014 한국전자통신학회 논문지 Vol.9 No.4

본 논문에서 우리는 저밀도 부호의 부호화 문제를 고찰한다. 특히 순환 치환 행렬을 이용한 저밀도 부호의 고속 부호화 알고리즘을 제시하였다. 고속 부호화 알고리즘은 고속 Hadamard 변환과 유사하며 결과적으로 제안 기법은 저밀도 부호의 간단하며 고속화된 부호화 알고리즘임을 보여주고 있다. In this paper, we consider the encoding scheme of low density codes. In particular, we propose the fast encoding algorithm of the low density codes using circulant permutation matrices, The fast encoding algorithm is similar to the fast Hadamard transform, and the results show that the proposed scheme is a simple and fast encoding algorithm of the low density codes.

노인의 인지기능에 따른 일상생활동작 수행능력 비교 연구

이광재,김순자,Lee, Kwang-Jae,Kim, Soon-Ja 대한물리치료과학회 2012 대한물리치료과학회지 Vol.19 No.2

Background : The purpose of this study is to provide the basic data according to cognitive function, that will help activities of daily living of the elderly through the comparative study of activities daily living and functional training. Methods : The subjects of this study 122 patients 65 years old or more ADL and cognitive function assessment was evaluated. They were registered in the Elderly in nursing homes and welfare centers, located in Gyeonggi. All study participants had a sufficient explanation for the purposes of research and evaluation methods and procedures for the elderly. The survey period 17 October to 11 November 2011 was conducted through face-to-face survey was conducted. Results : Cognitive function according to the K-MMSE score of 24 points or more, 23 to 18 points, 17 points or less were classified. Ability to perform activities of daily living (personal hygiene, bathing, toilet use, stair climbing, dressing, stool control, urinary control, gait, chair/bed, etc.) according to the degree of cognitive function by evaluating the ability to perform daily living compared results in all variables were statistically significant (p<.5). Conclusion : As a result, the higher cognitive functions can be seen that the higher the ability to perform activities of daily living.

엘레멘트 인버스 재킷 변환과 유사한 DFT의 새로운 희소 행렬 분해

이광재,박대철,이문호,최승제,Lee, Kwang-Jae,Park, Dae-Chul,Lee, Moon-Ho,Choi, Seung-Je 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.4C

This paper addresses a new representation of DFT matrix via the Jacket transform based on the element inverse processing. We simply represent the inverse of the DFT matrix following on the factorization way of the Jacket transform, and the results show that the inverse of DFT matrix is only simply related to its sparse matrix and the permutations. The decomposed DFT matrix via Jacket matrix has a strong geometric structure that exhibits a block modulating property. This means that the DFT matrix decomposed via the Jacket matrix can be interpreted as a block modulating process. 본 논문은 엘레멘트 인버스 처리에 근거한 재킷 변환을 통한 DFT 행렬의 새로운 표현을 다룬다. DFT 행렬의 역을 단지 재킷 변환의 소행렬 분해에 따라 표현하며 이러한 결과는 DFT 행렬의 역이 단지 이의 희소 행렬과 치환 행렬에만 관련됨을 보여준다. 재킷 행렬을 통한 DFT 행렬의 분해는 블록 변조 특성을 나타내는 강한 기하 구조를 갖는다. 이는 재킷 행렬을 통해 분해된 DFT 행렬은 블록 변조 과정으로 해석할 수 있음을 의미한다.