프로그램화 된 신체운동이 ADHD 아동의 주의산만행동과 과잉행동에 미치는 효과

최재원(Jae Won Choi),강경두(Kyoung Doo Kang),정혜연(Hye Yeon Jung) 한국사회체육학회 2012 한국사회체육학회지 Vol.0 No.47

The purpose of this study is to deeply analyze a change of the programmed physical exercise in attentiondeficient behavior and hyperactivity of children with ADHD, through the single-subject research design method. The research subjects were 4 elementary school students who are under being cured due to being judged to be ADHD at Child Psychiatric Clinic for C University Hospital where is located in Seoul at that time of beginning experiment in order to be conformed with the objective of research. For visual observation, the attention-deficient behavior was used the frequency-typed case sampling method(Shin So-yeon, Park Jaeguk, Kim Yeong-mi, Lee Hwa-eun, 2007). Observation of hyperactivity was used the contents, which Carlson and Hotfield(1991) defined, by referring to the contents by Mun Jae-gyeong(1998). The following are the results that were elicited through the research procedure of this study. First, the programmed physical exercise was indicated to reduce attention-deficient behavior in children with ADHD. Second, the programmed physical exercise was indicated to reduce hyperactivity in children with ADHD.

차세대 통신을 위한 소프트웨어 무선통신 기술

최재연 남서울대학교 2007 남서울대학교 논문집 Vol.13 No.3

A software-defined radio (SDR) system is a radio communication system which can tune to any frequency band and receive any modulation across a large frequency spectrum by means of programmable hardware which is controlled by software. An SDR performs significant amounts of signal processing in a general purpose computer, or a reconfigurable piece of digital electronics. The goal of this design is to produce a radio that can receive and transmit a new form of radio protocol just by running new software. The hardware of a software-defined radio typically consists of a superheterodyne RF front end which converts RF signals from analog IF signals, and analog to digital converter and digital to analog converters which are used to convert a digitised IF signal from and to analog form, respectively. Software-defined radio can currently be used to implement simple radio modem technologies. In the long run, software-defined radio is expected by its proponents to become the dominant technology in radio communications. It is the enabler of the cognitive radio. This paper introduces the Software defined radio technology for the next generation communication system. Key Words : Software defined radio, wireless communication

모드매칭방법을 이용한 직사각형도파관의 불연속면 해석

최재연 남서울대학교 공학연구센터 1999 공학연구 Vol.1 No.-

The scattering characteristics of the rectangular waveguide which has step discontinuities are analyzed by the modified TEmnx mode-matching method in the consideration of the higher-order modes generated at the discontinuity of the rectangular waveguide. The modified TEmnx mode-matching method needs less memory and CPU time than those of the generalized TEmn-TMmn mode analysis, and improves convergency. Two cases of discontinuity, a transformer, an E-plane corrugated filter and the combination of a transformer and an E-plane corrugated filter in rectangular waveguide are analyzed. The scattering characteristics of each passive component obtained by this method show notable differences between results with and without considering the higher-order modes.

RFID 수동형 태그의 결합방식 고찰

최재연 남서울대학교 2007 남서울대학교 논문집 Vol.13 No.4

The antenna emits radio signals to activate the tag and to read and write data to it. Antennas are the conduits between the tag and the transceiver, which controls the system's data acquisition and communication. Antennas are available in a variety of shapes and sizes. RFID tags are categorized as either active or passive. Active RFID tags are powered by an internal battery and are typically read/write, i.e., tag data can be rewritten and/or modified. Passive RFID tags operate without a separate external power source and obtain operating power generated from the reader. Passive tags are consequently much lighter than active tags, less expensive, and offer a virtually unlimited operational lifetime. The coupling method between passive tag and the reader is considered. Key Words : RFID, tag, reader, passive tag coupling

레이다의 유효반사면적에 따른 신호대 잡음비 분석

최재연 남서울대학교 공학연구센터 2001 공학연구 Vol.2 No.-

The signal to noise ratio(SNR) of a receiver in the radar system is varied with the cross-section fluctuation of the target. In this paper, the SNR is obtained by using the probability density function for the SNR. And then, the maximum detectable rages calculated, and are analyzed and compared with the previous methods. The computer simulation results show that the less the probability of false alarm and the larger probability of detection, the better accordance with the prediction.

다층유전체에서의 다중전송선 해석

최재연 남서울대학교 1996 남서울대학교 논문집 Vol.2 No.-

이 논문에서는 마이크로스트립 전송의 크로스토크를 해석한다. 주어진 전송선의 미분방정식으로부터 경계조건을 만족하는 해를 구하고 크로스토크 관계식을 유도한다. 크로스토크 해석에 필요한 주요 파라미터를 구하기 위해 전송선에 대한 그린함수(Green Function) 및 전하에 관한 적분방정식을 유도한 다음, 포인트매칭법(Point Matching Method)을 적용하여 경계면에서의 총 전하량을 구하고 이로부터 커패시턴스와 인덕턴스 매트릭스를 계산한다. 계산된 파라미터를 크로스토크관계식에 적용하고 주파수를 50 ㎒에서 5 ㎓까지 변화시키면서 근거리 및 원거리 크로스토크의 크기와 위상변화를 고찰한다. In this paper, the crosstalk between microstrip transmission lines is analyzed. The solutions of differential equations with boundary conditions for the given microstrip transmission lines are found and crosstalk predictions are derived. In order to calculate transmission parameters for crosstalk analysis, the integral equations are derived in the form of Green function with regard to total charges on the conductor and dielectric interfaces. Then the capacitance and inductance matrix are calculated by using point matching method. Applying the calculated paremeters to crosstalk prediction by computer simulation, both near-end and far-end crosstalks were studied for the frequency from 50 ㎒ to 5 ㎓.

무선송수신용 MMIC 기술동향 분석

최재연 남서울대학교 2005 남서울대학교 논문집 Vol.11 No.1

The purpose of this study is to understand and quantify the markets and future growth sectors of MMIC for wireless communication. It details the underlying trends in markets such as cellular infrastructure, cellular handsets, WLAN, wireless broadband, satellite, military, avionics, and point-to-point. Key MMIC for wireless communication market trends are reported, as well as technical overview was studied. The research evaluates recent trends including MMIC market trend for cellular, satellite, and optical communication. Finally, the study considers emerging technologies such as Gallium Nitride, and the increased penetration of Silicon Germanium in certain segments.

성별에 따른 대학생의 내면화된 수치심과 대인관계 문제가 우울증상에 미치는 영향

최재정,김미연,박민지,유미숙 숙명여자대학교 아동연구소 2015 兒童硏究 Vol.27 No.1

본 연구는 대학생의 내면화된 수치심과 대인관계가 우울증상에 미치는 영향력을 규명하고자 한 연구이다. 연구 대상은 서울, 경기 지역의 대학생 404명을 대상으로 자기보고식 설문조사를 실시하였다. 본 연구에 사용된 측정도구는 대학생의 내면화된 수치심, 대인관계, 우울증상의 척도였다. 분석방법은 SPSS 19.0 통계프로그램을 이용하여 빈도와 백분율을 산출하였고, 내적합치도 계수(Cronbach a)를 구하였다. 본 연구문제를 여자 검증하기 위해 중다회귀분석과 단계적 회귀분석을 실시하였고, 밝혀진 결과를 요약하면 다음과 같다. 첫째, 여자 대학생은 사회적 회피와 헌신성이 우울증상과 관계가 있는 것으로 나타났다. 둘째, 남자 대학생은 실수 불안과 지배성, 비주장성이 우울증상에 영향을 미치는 것으로 나타났다. 셋째, 여학생과 남학생의 결과 차이에서 모두 우울 증상에 유의미한 영향을 미치는 것으로 나타났고, 수치심의 하위요인보다 대인관계문제의 하위요인들이 우울 증상에 보다 많은 영향을 미친다. 수치심보다 대인관계 문제가 우울 증상에 보다 큰 영향을 미친다는 결과는 남녀 대학생 모두에게 공통적으로 나타났다.

TEM 혼 안테나용 임피던스 변환 특성 해석

최재연 남서울대학교 2010 남서울대학교 논문집 Vol.16 No.2

In this study, impedance transformation characteristic for the broadband TEM horn antenna is analyzed. The moment method can be applied to analyze the TEM horn antenna. The balun feeding the TEM horn is needed for impedace matching between antena which is balanced circuit and coaxial cable which is unbalanced circuit. The balun is composed of the Lange coupler with the two-stage cascaded connection and the impedance transformer designed by the short-linear matching method and the linear double taper method. At the antenna operating at the frequency band , 1.5 - 3 GHz, the measured data agree well with the calculated results. Key Words : impedance transformation, TEM, horn antenna

다층 구조의 전자파 흡수 유전체 해석

최재연 남서울대학교 2010 남서울대학교 논문집 Vol.16 No.1-1

Microwave application development has made it necessary to conceive special materials capable of highly absorbing such radiation. An experimental multi-layer active microwave absorber in described. The absorber is a planar structure which is analyzed by modified Powell's method. In case of four dielectric layers with inequality constraints in design variables. The optimal radar absorbing materials' are designed by setting the relative permittivity and the loss tangent of the dielectrics as a function of the frequency over 5~20GHz. Key Words : Absorber, active, adaptive, Powells' method