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

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

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.

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.

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

폐렴구균 감염에 의한 복부 대동맥류 1예

최소연,백경란,기현균,문치숙,오원섭,송재훈,신동현,위유미,고영혜 대한감염학회 2005 감염과 화학요법 Vol.37 No.2

폐렴구균은 폐렴, 수막염, 중이염 등의 감염증을 일으키나 감염성 대동맥류를 유발하는 경우는 매우 드물다. 저자들은 고혈압, 당뇨병 등을 가지고 있으며 대동맥류가 확인되지 않았던 78세 남자 환자에서 감염증의 증상없이 대동맥류 파열로 내원하여 폐렴구균에 의한 대동맥류로 진단되었던 증례를 경험하였기에 문헌 고찰과 함께 보고하는 바이다. Streptococcus pneumoniae has been an important etiologic agent of community-acquired pneumonia, meningitis, and otitis media. S. pneumoniae is also an important cause of bacteremia, especially in a community setting and it may cause intravascular infection. S. pneumoniae has been rarely been reparted to cause mycotic aneurysm and three is no case report on abdominal aneurysm caused by S. pneumoniae in Korea, yet. We experienced a case of abdominal aneurysm caused by S. pneumoniae infection. A 78-year old male with hypertension and diabetes mellitus was transferred to our hospital due to ruptured abdominal aortic aneurysm. Surgical intervention was done for removal of hematoma and vascular anastomosis. Ascending aorta showed atheromatous plaque with dystrophic calcification and thrombus. S. pneumoniae was isolated from the culture of the surgical specimen. After successful treatment with antibiotics for 7 weeks, he has been followed up uneventfully in outpatient clinic for 1 year.

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

Coherent 신호 검출기의 오류확률 성능 분석

최재연 남서울대학교출판국 2011 남서울대학교 정보통신 논문집 Vol.8 No.1

신호를 검출하는 방식은 비동기 방식과 동기 방식으로 나뉜다. 비동기 방식은 구성이 간단하지만 성능 개선에 제약을 받는다. 따라서, 일반적으로 성능을 중요시하는 시스템은 구조가 복잡하더라도 동기식 신호 검출법을 사용한다. 동기식 신호 검출은 신호의 존재 유무를 확인하는 것과 신호의 종류를 판별하는 것으로 나뉜다. 본 논문에서는 동기식 신호 검출 방식을 이용하여 신호의 존재 유무와 신호의 종류를 판별하고 이에대한 성능을 평가한다. Key Words : Coherent, Signal Detection, Pulse repetition, Wavelet