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.

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

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.

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

위성통신용 축모드 나선형 안테나설계

최재연 남서울대학교 2005 남서울대학교 논문집 Vol.11 No.1

This paper introduces design techniques for axial mode helical antenna operating at C-band. The basic parameters as helix diameter D, pitch angle α, length of pitch S, reflected surface S are analysed, and C-band helical antenna is designed. The turns of helix is 15 for improving performance of antenna gain. The result of measured characteristic is confirmed that VSWR is under 1.5:1.

흰쥐 십이지장 점막의 Polyamine 대사, [^(14)C]Spermine 단백 결합능 및 [³H]Thymidine DNA 섭취에 대한 Calcitriol과 Prednisolone의 상호작용

최상현,이영재,정휘정,김형건,신경호,천연숙,전보권 고려대학교 의과대학 1997 고려대 의대 잡지 Vol.34 No.1

Calcitriol has been shown to induce the duodenal synthesis of the spermine-binding protein. and hydrocortisone was reported to increase the intestinal polyamine contents. This study examined whether prednisolone might enhance or reduce the calcitriol effects on the polyamine contents, [^(14)C]spermine-protein binding activity, and [^(3)H] thymidine DNA synthesis of the rat duodenum. The mucosal contents of putrescine. spermidine. and spermine were increased by 198.8%, 84.0%, and 78.3%, respectively, within 6 hours after calcitriol. 5 ㎍/kg (CT) and fell down to the control values at 12 hours. And prednisolone. 10 mg/kg (PD) also increased the polyamine contents in similar patterns. They did not counteract each other in the polyamine metabolism. CT increased the [^(14)C]spermine-binding activity of the cytosol protein fraction from the duodenal mucosa by 71.1%. But PD increased the binding activity by 28.0% and did not affect the CT-induced increase. CT increased the [^(3)H]thymidine DNA synthesis of the duodenal mucosa by 42.3%. but PD reduced it slightly. The CT-dependent increase of the synthesis was significantly inhibited by PD. These results suggested that the inhibitory effect of glucocorticoids on the vitamin D dependent increases of the duodenal calcium absorption and mucosal proliferation seems not to be associated with the metabolic changes of polyamines in the duodenal mucosa.

X-대역 마이크로스트립 안테나 복사패턴 해석

최재연 남서울대학교 2008 남서울대학교 논문집 Vol.14 No.-

Radiation fields from the unit current source at the interface of an anisotropic uniaxial superstrate-substrate are calculated. The Green's function in the spectral domain which is necessary for analyzing a microstrip antenna by the moment method is derived. In order to consider the effect of anisotropy of the dielectric layer, radiation fields from an x-directed unit current source is obtained and radiation patterns are also calculated by changing the permittivity and thickness of the anisotropic dielectric layer. Key Words : X-band, Microstrip, Method of Moment, Green's function

대칭/비대칭 브로드사이드 결합전송선의 특성 해석

최재연 남서울대학교 1997 남서울대학교 논문집 Vol.3 No.-

The broadside coupled coplanar waveguide(BCCPW) shielded with the rectangular waveguide is analyzed by applying the Galerkin's method in the spectral domain. Characteristic parameters are obtained respectively when BCCPW is symmetric and unsymmetric with regard to the suspended dielectric substrate. Characteristic impedances and effective dielctric constants of BCCPW are also obtained by varying the height of the dielectric substrate and the width of the center and the ground strip in terms of transmission modes.

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 ㎓.

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.