디지털 광고 마케팅 성과 평가를 위한 2단계 효율성 측정 모형

김창중,이학연 대한산업공학회 2021 대한산업공학회 춘계학술대회논문집 Vol.2021 No.6

명상에 기반 한 대학생들의 습관개선 프로그램의 효과

김창중 동방문화대학원대학교 자연치유연구소 2017 자연치유연구 Vol.2 No.1

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비동기식 N-심볼 연속 위상 주파수 변조 방식을 위한 비트 인터리브 된 부호화 변조

김창중,이호경,Kim Chang-Joong,Lee Ho-Kyoung 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.3

인터리브 된 레일리 페이딩 채널에서 비동기식 N-심볼 연속 위상 주파수 변조(Continuous Phase Frequency Shift Keying, CPFSK) 방식을 위한 비트 인터리브 된 부호화 변조(Bit Interleaved Coded Modulation, BICM) 시스템을 설계하고 성능을 분석 하였다. 본 논문에서는 BICM의 설계와 성능 분석을 위하여 비동기식 N-심 볼 CPFSK의 기하학적 등가 정규 제곱 거리(Equivalent Normalized Squared Distance, ENSD)를 사용하였다. 특히 비동기식2-심볼 4진 CPFSK 방식을 위한 BICM 시스템을 설계하였으며, 이 시스템 의 성능을 ENSD를 이용하여 분석하고, 모의실험을 통해 검증하였다. We design and analyze the bit interleaved coded modulation(BICM) for noncoherent N-symbol continuous phase frequency shift keying(CPFSK) on the interleaved Rayleigh fading channel. In this paper, we use the equivalent normalized squared distance(ENSD) of noncoherent N-symbol CPFSK to design and analyze the BICM system. Specially, we design the BICM system for noncoherent 2-symbol 4-ary CPFSK, and analyze the performance of the system by using the ENSD. Simulation results are also provided to verify the theoretical performance analysis.

무선 페이딩 환경에 적합한 인터리브된 초직교 길쌈 부호화 UWB-IR 시스템의 성능 분석

김창중,이호경,Kim Chang-Joong,Lee Ho-Kyoung 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.6

본 논문에서는 무선 페이딩 환경에 적합한 인터리브된 초직교 길쌈 부호화 초광대역 임펄스 라디오 (Interleaved Super-Orthogonal Convolutional Coded Ultra Wide-Band Impulse Radio: ISOC-UWB-IR) 시스템을 제안하고, 그 시스템의 성능을 변환함수 상한(transfer function bounding)을 이용하여 분석하였다. ISOC-UWB-IR 시스템에 사용되는 인터리빙 기법은 복잡도와 성능에 따라 펄스 단위, 펄스 부그룹 단위, 펄스 그룹 단위 중에서 선택될 수 있다. 성능 분석 결과 레이리 페이딩 환경에서 ISOC-UWB-IR 시스템의 성능은 초직교 길쌈 부호(Super-Orthogonal Convolutional Code: SOC)부호기의 부호율보다 인터리빙 방식의 종류에 더 많은 영향을 받는 것으로 나타났다. In this paper, we propose interleaved super-orthogonal convolutional coded ultra wide-band impulse radio(ISOC-UWB-IR) system, and analyze its performance. The proposed system uses interleaver and deinterleaver to decorrelate the temporal correlation of the fading process and to obtain the diversity gain. We also suggest the three types of interleavers, which are pulse-wise interleaver(PI), pulse sub-group-wise interleaver(PSGI), and pulse group-wise interleaver(PGI). Performance analysis result shows that the interleaving scheme, rather than the code rate of super orthogonal convolutional code(SOC) encoder, affects the performance for the Rayleigh fading channel.

공간적 전파전파 특성을 고려한 MIMO 안테나에 적용한 OFDM 전송 채널의 에르고딕 용량 분석

김창중,이호경,Kim Chang-Joong,Lee Ho-Kyoung 한국전자파학회 2006 한국전자파학회논문지 Vol.17 No.3

본 논문에서는 공간적 전파전파 특성을 고려한 MIMO 안테나에 적용한 OFDM 전송 채널 모형을 사용하여, 채널의 에르고딕 용량을 계산하고 그 특성에 대해 논의한다. 특히 3GPP TR 25.966 V6.1.0에 정의되어 있는 case I의 LOS off 채널의 에르고딕 용량을 구하고, 클러스터 각 퍼짐과 도착 각도(Angle Of Arrival: AOA)의 차이에 따른 채널 용량 변화를 고찰한다. 연구 결과 클러스터 각 퍼짐의 증가에 따라 채널 용량이 증가하며, 35도 이상에서는 큰 증가가 없는 것을 볼 수 있었다. In this paper, we use the OFDM transmission channel model applied to the MIMO antennas considering spatial propagation property to evaluate and investigate the ergodic capacity of the channel. Specially, we have applied our results to 3GPP TR 25.99 V1.1.0 case 1 LOS off channel description and calculated ergodic capacity with parameters, cluster angle spread and angle of arrival(AOA). Our results show that as the cluster angle spread increase the channel capacity increase until 35 degree, but for more than 35 degree channel capacity does not improved.

회전 변환 정사각 신호 성좌에 적용한 낮은 PAPR의 CIOD 전송방식

김창중,이호경 대한전자공학회 2012 電子工學會論文誌-TC (Telecommunications) Vol.49 No.8

회전 변환된 정사각 QAM 신호 성좌를 클리핑하여 좌표 축 인터리브 된 직교 설계(Coordinate Interleaved Orthogonal Design; CIOD)에 적용되는 낮은 최대 전력 대비 평균 전력 비(Peak-to-Average-Power Ratio; PAPR)을 가지는 신호 성좌를 설계한다. 본 논문에서 제안하는 신호 성좌는 기존의 회전 변환된 정사각 QAM 신호 성좌에 비해 매우 낮은 PAPR을 가질 뿐 아니라, 기존의 신호 성좌와 거의 동일한 비트 오율(Bit Error Rate; BER) 성능을 가진다. We introduce a rotated square QAM constellation with low peak-to-average-power ratio (PAPR) for coordinate interleaved orthogonal design (CIOD). The proposed signal constellation has much lower PAPR than the ordinary square QAM constellations for CIOD while it keeps almost the same coordinate product distance (CPD).

濟州道의 地域間 農家所得 隔差 要因에 관한 硏究

金昌中 濟州大學校 觀光産業硏究所 1988 産經論集 Vol.2 No.-

石炭化學工業의 育成方向에 關한 硏究

金昌中 제주대학교 1984 논문집 Vol.17 No.2

Ⅰ. Research Purpose The study intends to find the priority to development of chemical products derived by coal tar and crude light oil with a view to producing useful information for the future planning of investment in the industry. Ⅱ. Research Method The work for the study consists of a literature review on the general coal tar chemical industry, trends of market structure of coal tar chemical products and production technology of major chemical products derived by coal tar chemical industry. The method applied in this study is originally based on the present status and trend analysis using the data of the literature mertioned above. Ⅲ. Major Findings The priority to development of derived products for the industry in Korea was analyzed on the basis of following five creteria: 1) dependence of raw materials on coal tar chemical industry, 2) economy of scale compared with oil-oriented production process, 3) rate of value added of such derived products, 4) size of domestic market, 5) technical problems of industrialization. The result of analysis was to be showed that the priority to development would be carbon black (CB) and phthalicanhydride (PA) firstly, and other chemical products derived by the industry should be developed subsequently.

特殊鋼의 需要構造分析 및 豫測 : 巨視的 接近法을 中心으로

金昌中 건국대학교 1980 論文集 Vol.12 No.1

Ⅰ. Research Purpose The study intends to forecast the long-term demand of special steel with a view to producing useful information for the future planning of investment in the industry. Ⅱ. Research Methods The work for the study consists of a literature review on demand forecast methods and development of long-term projection model for steel damand. The method applied in this study is originally based on multiple regression analysis using time series data. However, the model in this study is modified and expanded in order for the trend factors to be fully reflected. To deal with the trend factors, the time series data in Korea and Japan are adopted in the establishment of the model. Ⅲ. Data Collection and Processing In the long-term projections, per capita GNP, heavy-industrialization rate, and relative price index of special steel during the 1970-78 period in Korea and the 1958-70 period in Japan are employed as explanatory variables. The CDC Cyber 73 computer at KIST was used to process and analyze the data. Ⅳ. Major Findings 1. The estimated model indicates that the elasticities of percapita special steel demand to percapita GNP, heavy-industrialization rate, and relative price index represent respectively as 1.34, 0.61, and -1.48. 2. As a result of the predictive test for the estimated model, percapita special steel demand in Korea and Japan is well explained by the three explanatory variables mentioned above. 3. Assuming that annual percent changes of percapita GNP, heavy-industrialization rate, and relative price index are 8.0%, 3.3%, and -1.6% respectively during the 1979-91 period, percapita special steel demand in Korea will be annually increased by 15.3 percent. Therefore its total domestic demand is projected to increase from 323,100 tons in 1978 to 495,100 tons in 1981 to 1,110,200 tons in 1986, and further to 2,373,000 tons in 1991.

중년남성의 심념처 명상수행 경험: 내러티브 연구

김창중 동방문화대학원대학교 자연치유연구소 2020 자연치유연구 Vol.5 No.1

This study uses narrative study to describe the mind(cittānupassanā) meditation practice difficulties of a middle-aged man, to explain contextual meanings of his mind meditation practice difficulties, to examine how to solve his difficulties on mind meditation practice through mind meditation practice counselling, and to investigate how to practice mind meditation in his daily life. During his mind meditation practice, the research reporter suffered from dazed headache, repetition of distracted mind between greed and hatred, and suspicions on the objects of mind meditation practice. It was explained that these difficulties on mind meditation practice were due to an obsessive anxiety and contracted mind caused by his father‘s financial incompetence from childhood, a sense of duty as the eldest son and the eldest grandson of his family, and a contextual factors that lived in conformity with the given environment rather than his own desire. He healed his dazed headache, obsessive anxiety and contracted mind, was able to take proper measure on repetition of distracted mind between greed and hatred, and was resolved suspicions on the objects of mind meditation through mind meditation practice counseling with Sayadaw, He began his day with mind meditation practice in his daily life, and through this mind meditation practice, he became to live a leisurely life by recognizing various selectable information and choosing the appropriate one among them. The significance of this study is as follows. Firstly, it is a study on the vivid experience of mind meditating practice of a middle-aged man under the circumstances of the rarity of study on the mind meditation practice. Second, it is a study that confirmed the effect of healing and changing life through mind meditation practice counseling with Sayadaw. Third, in practice, it can serve as a guide to the future for the healing of mind problems through mind meditation practice counselling.