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WLAN/WiMAX 시스템 적용을 위한 DGS를 갖는 삼중대역 안테나 설계 및 제작
서나현,이영철,윤중한,Seo, Na-Hyun,Rhee, Young-Chul,Yoon, Joong-Han 한국정보통신학회 2017 한국정보통신학회논문지 Vol.21 No.4
본 논문에서는 DGS (Defected Ground Structure)를 적용한 WLAN/WiMAX 시스템에 적용 가능한 모노폴 안테나를 제안하였다. 제안된 안테나는 마이크로스트립 급전을 바탕으로 두 개의 선로와 DGS를 갖도록 구성하여 삼중대역 특성을 갖도록 설계하였다. 두 개의 선로 그리고 세 개의 슬릿의 위치 및 길이와 DGS 위치와 길이를 적절한 조정하여 본 논문에서 요구되는 특성을 얻기 위한 최적화 수치를 얻었다. 제안된 안테나는 $34mm(W_1){\times}34mm(L_1){\times}1.6mm(t)$의 비유전율 4.4인 FR-4 유전체 기판 위에 $17.0mm(W_6){\times}30.75mm(L_3+L_4+L_9)$의 크기로 제작되었다. 제작 및 측정결과로부터 -10 dB 임피던스 대역폭을 기준으로 360 MHz (2.335~2.695 GHz), 645 MHz (3.37~4.015 GHz) 그리고 1,770 MHz (5.14~6.91 GHz)의 대역폭을 얻었다. 또한 제안된 안테나는 요구되는 삼중대역에서 측정된 이득과 방사패턴의 얻었다. In this paper, a microstrip-fed triple-band monopole antenna with DGS (Defected Ground Structure) for WLAN/WiMAX applications was proposed. The proposed antenna is based on a microstrip-fed structure, and composed of two strip lines and DGS structure and then designed in order to get triple band characteristics. We carried out simulation about parameters. Adjusted the position and length of the two strips and three slits, we get the optimized parameters. The proposed antenna is fabricated on an FR-4 substrate of which the dielectric constant is 4.4, and its overall size is $34mm(W_1){\times}34mm(L_1){\times}1.6mm(t)$, and its proposed antenna size is $17.0mm(W_6){\times}30.75mm(L_3+L_4+L_9)$. From the fabricated and measured results, return loss of the proposed antenna satisfied return loss -10dB bandwidth 360 MHz (2.335~2.695 GHz), 645 MHz (3.37~4.015 GHz) and 1,770 MHz (5.14~6.91 GHz). And measured results of gain and radiation patterns characteristics displayed for operating bands.
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서나현,정여주 서울여자대학교 특수치료전문대학원 2009 심리치료: 다학제적 접근 Vol.9 No.2
본 연구의 목적은 빈곤가정의 아동 3, 4 학년을 대상으로 하여 집단미술치료가 아동의 정서지능 향상에 어떠한 영향을 미치는지 알아보기 위한 것이다. 사용 본 연구를 위해 서울시 K구에 위치한 지역아동센터의 국민기초생활보호대상 수급권 가정과 차상위층 가정의 아동들을 대상으로 집단미술치료를 실시하였다. 치료집단6명, 통제집단 6명으로 설정하였고, 치료집단을 대상으로 하여 2009년 7월 16일부터 2009년 10월 15일까지 주 1-2회로 70분씩 총 15회기의 집단미술치료가 실시되었다. 본 연구에서는 아동의 정서지능 점수 변화를 측정하기 위하여 문용린이 Mayer와 Salovey의 정서지능 모형에 입각하여 개발한 자기 보고형 척도인 ‘정서지능 검사’ 를 사용하였다. 정서지능의 전체점수와 하위영역의 점수를 측정해 SPSS 12.0 프로그램으로 분석하였다. 본 연구의 결과를 요약하면, 집단미술치료가 빈곤가정 아동의 정서지능에 미치는 효과를 알아본 결과 집단미술치료 실시 이후 치료집단의 정서지능에 유의미한 결과를 보였고, 집단미술치료가 빈곤가정 아동의 정서지능의 다섯 가지 하위영역 중 세 가지 영역 즉, 정서인식 능력과 정서표현 능력 그리고 정서조절 능력에서 유의미한 결과를 보였다. 하위영역 중 감정이입과 정서활용 능력에서는 점수의 증가는 있었으나 유의미한 결과는 나타나지 않았다. This Study was to investigate what Group Art Thrapy makes effects on Improvement of Emotional Intelligence of Children from Poor Families. For the purpose of this study, a total of 15 periods of group art therapy were carried out in a local children's center located in K-gu Seoul with children from the near-poor families and those from the families entitled for the national basic livelihood protection system. To measure Moon, Yongrin's 'emotional intelligence test' was used to measure the total score of emotional intelligence and the scores for sub-areas, which were then analyzed with SPSS 12.0 program. The present study gained the following results: First, in terms of the effects of group art therapy on the emotional intelligence of children from poor families, the group art therapy was found to have a significant influence on improving the emotional intelligence of the experimental group. Second, from the perspectives of such sub-areas of emotional intelligence as perception of emotion, expression of emotion, and regulation of emotion, the group art therapy showed significant results among the children from poor families. Among the sub areas, empathy of emotion and the ability to utilization of emotion, the scores increased without significant results, which is attributable to the lack of development in empathy due to the young and immature ages of study subjects and to insufficient intimate emotional interaction with nurturers at usual times. In addition, as the ability to utilize emotional intelligence involves every sub-area of the emotional intelligence, the relatively short-term art therapy of 15 periods seems not to have added much to sufficient development in that respect.
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서나현(Seo, Na-Hyun) 한국실내디자인학회 2011 한국실내디자인학회논문집 Vol.20 No.1
According to the recent expansion of Trade Shows within the government’s policy in exhibition industry, studies about the trade shows needs to be focused more on the attendees related to the environment. In most of the researches related to this topic until now had been biased in terms of economic benefits and the standpoint of organizers. Considering that this study is to improve environment of Trade Shows from an attendees’ point of view as an attempt to apply the concept of Service Design which is the activity of planning and organizing people, infrastructure, communication and material components of a service. It is about the idea of bringing service design principles to services in Trade Shows. Good design process brings in a good understanding of the context : understanding the environment and redefining problems from the standpoint of attendees, in order to improve its quality, the interaction between service provider and attendees and the attendees’ experience.
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고은주,서나현 한국의류학회 2003 한국의류학회지 Vol.27 No.9,10
The purpose of this study was to identify the current of textiles and apparel firms in the overseas markets and to examine the relationship between firms' characteristic(i.e., sales volume) and international marketing strategies. A random sample of 311 textiles and apparel firms were selected. The survey design method was used to test conceptual framework. Adjusted response rate was 33.4%(n=115). Descriptive analysis(i.e., frequency, percent) and -test were used for data analysis. About the current situation of textiles and apparel firms in the overseas markets, the motivation for international market entry was highly found to expand their operation from domestic to international market, and most firms were found to be involved with OEMs(Original Equipment Manufacturers) as an entry mode for international market. China and US market were the most popular market among Korean textiles and apparel firms. Product differentiation strategy, pricing strategy based on manufacturing cost and buyer's offering price, place strategy using foreign buyers and participating a few international exhibition were frequently used among Korean textiles and apparel firms for international marketing. Among textile firms, sales volume was related to product strategies (buyer's offer) and place strategy(channel). Among apparel firms, product strategy(product labeling), price strategy(price satisfaction). The findings of this can be used when Korean textiles and apparel firms do strategic planning and evaluate the international marketing strategies. Also information and results of this study may assist policy markers to develop better ideas and strategies for textiles and apparel industry.
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김동현(Dong-hyeon Kim),서나현(Na-Hyeon Seo),박기원(Ki-Won Park),이영철(Young-Chul Rhee) 한국지능시스템학회 2017 한국지능시스템학회논문지 Vol.27 No.2
본 논문에서는 650MHz에서 2,700MHz의 주파수 대역에서 우수한 동적영역과 선형성 특성을 나타내는 RF-수신기를 설계하고, 왜곡신호(누설 또는 혼변조)를 측정할 수 있는 지능형, 광대역 RF-왜곡신호 계측시스템을 구현하였다. 광대역 특성의 RF-수신모듈은 저 잡음특성과 동적영역 관계를 분석하여 RF수신단의 선형화 파라미터를 최적화시켰다. 지능형 디지털-왜곡(혼변조) 측정시스템에서는 측정하려는 왜곡(혼변조)신호를 PC상의 GUI 로 처리하여 원하는 계측파라미터를 PC 모니터에 나타내었다. 설계된 계측장치를 650MHz-2700MHz 까지 가변시켜 왜곡신호를 측정한 결과, -127.8dBc에서-138dBc까지 나타내어 지능형 디지털 계측기로 이용될 수 있음을 보였다. In this paper, we developed an intelligent and wideband RF-receiver module to represent a high dynamic range and good linearity characteristics up to 650MHz-2700MHz frequency band. and implemented an intelligent digital-RF- distorted signal measuring system for the RF distortion (intermodulation) signals. Broadband RF-receive module was designed to represent the optimized linear parameters of the receiver to meet the low noise and wide dynamic range. The designed intelligent digital-distortion(intermodulation) signal measument system measured by applying the 1MHz IF of third intermodulation signal of DUT and Measured data was recorded by program on the PC monitor with GUI interface. By variable up to 650MHz-2700MHz measured data showed up to-127.8dBc to -138dBc of the distortion (intermodulation) signal. And developed intelligent digital- distortion signal measurement system can be used to measure intermodulation distortion sign aolf wireless system widely.
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