지리정보 시스템을 기반으로한 CT-2 환경의 전파 손실 예측 모델 개발

전중창 위덕대학교 부설 전자기술연구소 1997 전자기술연구소 논문집 : 위덕대 Vol.1 No.1

송신기 안테나 높이가 주변 빌딩보다 훨씬 낮은 CT-2 통신 환경에서, 전파 손실 예측을 위한 광선 추적 기법이 제안되었다. 전파 경로 추적은 지리 정보 데이터의 벡터 해석에 의하여 2차원 평면상에서 이루어지며, 이 결과로부터 송수신 안테나의 높이 차이에 의한 3차원 정보가 유도된다. 수신전력 계산에는 1회의 모서리 회절파를 포함한 건물 벽면 반사파와 지면 반사파가 고려되었다. 속도 개선을 위한 다중 수신점 해석과 효율적인 회절파 계산 알고리즘이 제안되었으며, CT-2 통신 환경이 전파 손실에 미치는 영향을 수치 시물레이션을 통하여 분석하였다. In this paper, we propose a ray tracing algorithm for the prediction of wave propagation in CT-2 communication environments where the base station antenna height is much lower than the average height of buildings. The ray paths are determined from the vector analysis of GIS data in the 2-D plane, from which 3-D informations caused from the difference of heights of transmitter and receiver antennas are derived to obtain more accurate results. Reflections from building walls and ground including one diffraction from the building edge are considered in the calculation of received power. We propose an efficient algorithm to improve the computation time with the concept of multiple receiving points and the programming technique of calculating diffraction waves. Finally, we have shown numerical results to discuss the effect of CT-2 communication environments on the path loss.

학교부적응 학생을 위한 심리지원 프로그램의 효과 연구

전종국,박중규 대구대학교 특수교육재활과학연구소 2009 再活科學硏究 Vol.27 No.2

본 연구의 목적은 부적응 중고등학생들의 학교생활 적응을 돕기 위한 심리지원 프로그램을 개발하고, 프로그램이 학생들의 적응행동의 변화에 미치는 영향을 조사하는 것이다. 학교부적응 중고생 19명을 대상으로 5일간 집단상담 형식의 프로그램을 진행하고, 사전과 사후에 청소년 자기행동평가척도(K-YSR)와 부모가 실시하는 아동․청소년 행동평가척도(K-CBCL)을 실시하였다. 프로그램 사전-사후 비교 결과, 청소년 자기행동평가척도에서 총점과 공격성 하위척도에서 유의한 차이가 나타났다. 부모에 의한 아동․청소년 행동평가척도에서는 사회성 척도에서 유의한 차이가 나타났다. 단기간의 집중적 개입을 통해 참가자의 자기행동 평정에서 감소된 문제행동 및 보호자 평정에서의 사회성 증진 결과는 개입프로그램의 효과를 입증하는 것이었다. 끝으로 본 연구의 한계와 제안점을 논의하였다. In this study, we try to investigate the effects of psychological support-based group counseling on decreasing problematic behaviors of juvenile delinquency. The participants were 19 students(male=6 and female=13) who were treated as juvenile delinquency. The program is consisted of scoiodrama, self-growth group counseling, sex education, career exploring, parental training, and mentoring. The length of program is 35 hours in the five-days workshop. Measures are K-YSR(Korean version of Youth Self Report, Achenbach, 1991) and K-CBCL(Korean version of Child Behavior Checklist, Achenbach & Edelbrock, 1983). The major results of this study were as follows. First, there was significant difference between pre-test and post-test in overall scores of K-YSR particularly on aggression subscale. Second, there was significant difference between pre-test and post-test scores on sociality in K-CBCL. In conclusion, this program showed partial effects of decreasing problematic behaviors of juvenile delinquency.

유전율이 다른 두 기판의 접합에 의한 마이크로스트립 불연속의 반사특성 해석

전중창,김태수,한수용 위덕대학교 산업기술연구소 2001 산업기술연구소 논문집 Vol.5 No.1

The finite-difference time-domain (FDTD) method has been applied to the analysis of microstrip discontinuities comprised of junctions of two substrates having different dielectric constants. The discontinuities treated in this paper include microstrip step-in-width on a single substrate for the validation of analysis method, and microstrip junctions of two different substrates where strip widths are varied to analyze the reflection characteristics numerically. It is noted that the result for the junction having a uniform strip width but different dielectric constants shows a similar characteristic with a conventional step-in-width discontinuity. The importance of this result is the implication that the junctions treated in this paper can be applied to the design of microwave passive circuits such as filters and matching networks.

FM-CW 레이더 분해능 개선을 위한 상관 알고리듬

전중창,김태수 위덕대학교 산업기술연구소 2000 산업기술연구소 논문집 Vol.4 No.1

본 논문에서는 FM-CW 레이더의 원리를 이용한 마이크로파 거리계에서 비트 신호(beat signal)의 스펙트럼 상관도(correlation)를 해석한다. 산업 자동화용과 같이 정밀도가 높아야하는 경우, 거리계에 사용되는 VCO의 주파수 선형도가 매우 좋아야한다. 그러나, 실제 VCO의 선형도를 높이는 일은 매우 어려우며, 장비의 고가화를 초래하게 된다. 거리 차가 충분히 작은 경우, 두 비트 신호의 주파수 스펙트럼간에 상관도가 peak를 나타내는 주파수 offset이 존재하게 되며, 본 논문에서는 이를 바탕으로 일반적 VCO를 사용하여도 정밀한 측정을 할 수 있는 상관 알고리듬을 제안한다. 상관도에 대한 배경 이론을 유도하고, 제안된 알고리듬을 적용한 측정 결과를 제시하였다. In this paper, we analyze spectrum correlation of beat signals in the microwave level meter based on the FM-CW radar. For industrial applications, level meters must have high precision, which requires a good linearity of VCO. But, in practice, it is very complicated or very expensive to make VCO linear enough to be acceptable in the industrial field. We propose a measurement algorithm using the fact that there exists a peak in the spectrum correlation of beat signals when range difference is adequately small. This makes it possible to determine the range difference in a precise manner even using a practical VCO. We develop the background theory of correlation and show some results using this algorithm.

하악골에서 발생한 원발성 Ewing씨 육종 1례

고중화,전상훈,오영택,최진혁 대한이비인후과학회 1999 대한이비인후과학회지 두경부외과학 Vol.42 No.2

聽覺障碍兒의 光刺戟에 依한 全身反應時間의 硏究(1)

田重基 大邱大學校特殊敎育硏究所 1985 特殊敎育硏究 Vol.12 No.-

The results which are comparing and analy reaction time of moving four directions at the whole body reaction time by light signal to sbject 9 schoolboys and seven school girls of hearing handicapped group, and 10 boystudeuts and 9 girl students of general group children(high school students) are as follow: ① No difference is choice reaction time in the four directions (forward, back ward, right, left) of hearing handicapped group children and general groups children. ② Simple reaction time is that the boy students of the hearing handicapped group are carefully faster than general children at the forward direction and there is no difference in the direction of back, right and left. Girlstudents is not different in simple reaction time between two groups. ③ All the boy and girl of the hearing handicapped group and general group children are faster simple reaction time than choice reaction time. For more than it, between hearing handicapped group and general children there is no difference in the whole body reaction time. It is worth our while to notice that reaction time of boy students of hearing handicapped group is faster than that of general students at the front direction, simple reaction time.

소출력 송수신기용 광대역 안테나 개발

전중창,한수용 진주산업대학교 산업과학기술연구소 2007 산업과학기술연구소보 Vol.- No.14

As the wireless services are popular for convenience, antennas having wider bandwidth are required more often. In this paper, a new type of monopole antenna is invented for multiple band applications. Multiple band property for the proposed antenna is achieved by adjusting the coupling structure of the antenna base. -10 dB impedance bandwidths are 1.74-3.06 GHz and 5.59-10.62 GHz, which can cover various kinds of wireless services, such as PCS(1.75-1.87 GHz), IMT-2000(1.92-2.17 GHz), WiBro(2.3-2.39 GHz), WLAN (2.412-2.483 GHz, 5.725-5.825 GHz), DMB(2.63-2.655 GHz), High-band UWB(7.2-10.2 GHz).

"Mandibular Swing 접근법"에 의한 인두후벽암 치험 1례

전영명,고중화,이진석 아주대학교 의과학연구소 1996 아주의학 Vol.1 No.1

Traditionally, enbloc resection of the primary tumor with its lymphatics is the surgical procedure of choice for many oral and oropharyngeal malignancies. However, the operative fields reached by conventional approaches are too limited and narrow to remove extensive tumors, especially posterior pharyngeal tumor. The mandibular swing approach has greatly assisted tumor ablation and reconstruction of these areas. The authors essayed a mandibular swing approach for the ablation of a huge posterior pharyngeal wall carcinoma.

기판의 3차원 불연속 구조를 갖는 마이크로스트립 선로의 등가회로 해석

전중창 진주산업대학교 산업과학기술연구소 2003 산업과학기술연구소보 Vol.- No.10

In this paper, we have analyzed a new type of microstip discontinuity, which has a З-dimensional dent in the substrate, using the finite-difference time-domain (FDTD) method. The accuracy of the FDTD application is validated by the compatison between FDTD results and HFSS software results. For the purpose of using in the microwave CAD applications, an equivalent circuit for the discontinuity is developed based on the numerical results. The equivalent circuits are accurate within 4.2% comparing with the original data. The equivalent circuits show a potential use for filter applications.

聽覺 障碍兒童의 運動 後 心肺機能 變化에 關한 硏究

田重基 慶北大學校 師範大學 體育學硏究會 1984 體育學會誌 Vol.11 No.-

51 male subjects aged 12years were devided into normal group(17), hearing handicapped group(17), and crippled group(17). After running 60m the cardiopulmonary response of the heart rate, blood pressure, and respiratory rate were measured and analyzed in order to find out the physiological differences among the three groups. The result were summarized as follows. <In resting stage> 1. Hearing handicapped group showed a little higher blood pressure than cripped group, and almost the same as normal group. 2. Hearing handicapped group showed almost the same respiratory rateas normal group and noticeably higher than crippled group. <After running bom> 3. Hearing heandicapped group showed 146.25% increase of the systolic pressure than in vesting state, crippled group 153.13% increase, and normal group, 133.03% increase. In short hearing handicapped group's systolic pressure after exersise was noticeably higher than crippled group's and almost the same as normal group's. Hearing handicapped group's diastolic pressure also increased 112.74% and normal group's increased 129.40%, and normal group's increased 104.65%, that is, hearing handicapped group's diastolic pressure was remarkably higher than crippled group's and almost the same as normal groups. 4. In heart rate, hearing handicapped group showed 142.03% increase than in resting state crippled group, 142.06%, and normal group 140.66%. In short, hearing handicapped group and cripped group a little higher increase of heart rate than normal group. 5. In respiratory rate, hearing handicapped group showed 166.46% increase than in resting state, crippled group, 159.68%, and normal group 134.93% that is, hearing handicapped group's and crippled group's respiratory rate was significantly higher than normal groups. We need to pay attention to the result of this research that in cardiopulmonary response in resting state, respiratory rate was noticeably lower in crippled group than in hearing handicapped group, and normal group, and in cardiopulmonary response after exercise, hearing handicapped group's heart rate, blood pressure, and respiratory rate were higher than crippled group's and lower than normal group's. It is necessary to mak deeper research on psychological, analytical, and physiological aspects, based on the this research.