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.

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.

소원성취 프로그램이 소아암 및 난치병 환아들의 질병 적응에 미치는 영향: 레질리언스와 질병 스트레스의 매개효과를 중심으로

이광재,최경일,Lee, Kwang Jae,Choi, Kyung Il 한국호스피스완화의료학회 2015 한국호스피스.완화의료학회지 Vol.18 No.2

목적: 본 연구의 목적은 소아암 등의 난치병 환자들의 소원성취 프로그램에 대한 만족도가 질병 적응에 미치는 영향에서 레질리언스와 질병 스트레스가 갖는 매개효과를 파악하는데 목적이 있다. 방법: 한국메이크어위시재단에서 2010년부터 2014년까지 5년간 소원을 이루었던 1,597명의 환아 중 문장해독과 기억유지가 가능한 666명의 10대 이상에 해당하는 환아들에게 2015년 1월 2일에 모바일 설문지를 발송하였다. 그 결과 357명이 응답을 하였으나 성실하게 응답한 292명의 자료를 분석하였다. 결과: 소아 난치병 환아들이 소원성취 프로그램에 대해서 갖는 만족도는 레질리언스에 긍정적인 영향을 미치는 것으로 나타났다. 레질리언스는 질병 스트레스에 부정적인 영향을 미치고 질병 적응에는 긍정적인 영향을 미쳤으며, 질병 스트레스는 질병 적응에 부정적인 영향을 미치는 것으로 나타났다. 결론: 본 연구결과를 볼 때 소아 난치병 환자를 위한 소원성취 프로그램에 대한 만족도는 레질리언스의 향상과 질병 스트레스의 감소를 통하여 궁극적으로 이들의 질병에 대한 적응력을 높이는 효과가 있다는 것을 알 수 있다. 따라서 소아 난치병 환자들의 욕구와 특성을 면밀히 분석하여 소원성취 프로그램을 실행하고 만족도를 높이면 이들이 질병에 대해서 보다 적극적으로 대처할 수 있는 동시에 현재의 삶을 긍정적으로 영위할 수 있는 동기를 제공할 수 있을 것이다. Purpose: The purpose of this study is to examine how wish granting influences children with life-threatening medical conditions when it comes to their adaptation to disease with a focus on the mediating effect of resilience and stress caused by disease. Methods: From January 2, 2015 through January 12, 2015, a survey was conducted on 292 children with life-threatening diseases whose wishes were granted through Make-A-Wish Korea. The data were collected using the impact of a wish scale, the Children's Adjustment to Cancer Inventory, the Childhood Cancer Stressor Inventory, and the resilience scale in children with chronic illness. The data were analyzed using SPSS/WIN 20.0 and Amos 21.0. Results: Satisfaction with the wish granting program enhances resilience, and resilience affects stress caused by medical conditions as well as adaptation to disease. Also, stress caused by medical conditions influences adaptation to disease. Conclusion: Wish granting is effective in both facilitating chronically ill children to adjust to disease and reduce their stress from disease. Thus, children with life-threatening medical conditions could be assisted or motivated to adjust to disease by improving satisfaction achieved by wish granting.

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.

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.

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.

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.

이완음악이 신체유연성과 스트레스에 미치는 영향

이광재,김동훈,Lee, Kwang-jae,Kim, Dong-hun 대한물리치료과학회 2015 대한물리치료과학회지 Vol.22 No.2

Background : The purpose of this study is to identify how the relaxation music listening during exercise influences body flexibility and stress. Methods : Twenty healthy adults 20s and 30s who lack of body flexibility were recruited and each subjects performed exercise during the relaxation music listening or no listening. Bach, aria of linear G was used as the relaxation music. The experiment was conducted for 4 weeks. In this study, PASW ver 18.0 was utilized to perform non-parametric tests for comparisons. Result : The result with respect to the dependent variables are as follows: When non-parametric tests were conducted to compare body flexibility at the test of the right ear touch behind head by left hand and the stretching hands test between the two groups after exercise, they showed significant differences in statistical terms (p<.05). Conclusion : From the above results of the study it was found that the application of the relaxation music during the exercise is effective, it improved the body flexibility of the right ear touch behind head by left hand and the stretching hands more than the exercise without the relaxation music did. The outcome of the experiment may provide basic data for developing an effective way to increase body flexibility.