주제철학의 인간이해와 그 평가

박명철 ( Myung Chul Park ) 연세대학교 통일연구소 1999 통일연구 Vol.3 No.2

This essay deals with the understanding of human beings in Juche philosophy that has dominated the North Korean society more than half a century. Emphasizing to build up a socialist society and human beings fitting to this society, North Korea has proclaimed, in particular, her idea of remaking human beings. Therefore, this essay examines the basic framework, such as how Juche philosophy understands human beings, and how this understanding supports ideologically to its social reformation and political system. This attempt will be the foundation to understand the North Koreans` value-system, way of thinking, and structure of consciousness, and also contribute to mutual embrace between North Koreans and South Koreans for reunification. In terms of perspective to see North Korea as well as methodology to approach this issue, the author used critical immanent approach that let North Koreans tell themselves and then criticize their logic and theory. The criticism was also done by socialists, such as Karl Marx and Ludwig Feuerbach, and this author added some comments. In the second section of this essay, socio-political background of Juche philosophy, i.e. the process and content of "Juche socialism" since the establishment of "socialist system" by proclamation of socialist constitution in 1972, was discussed. And then the anthropology of Juche philosophy was analyzed: the "philosophical principle" of Juche idea, the thesis that "humans are subjects of everything"; concepts and interrelations of three attributes of human beings, i.e. "independence", "creativity", "consciousness"; the difference between "sociopolitical life" and "sociopolitical organism", and its theoretical link with the Party and the Leader. These themes were defined and analyzed, and then the criticism from the socialist perspective through Karl Mark and Ludwig Feuerbach was attempted. In the third section, problems raised by Juc!1e anthropology were arranged as the following four thesis. Thesis 1, people`s hope: "humans become subjects of the world"; thesis 2, "people are subjects of history"; thesis 3, use of violence and sufferings of "revolutionary humans"; thesis 4, dual ethical rule: "one for all, all for one." These theses were examined from the perspective of social ethics, and their criticism was added. In the fourth section, as the conclusion, the limit of this research and future tasks, as well as this author`s suggestions, were added in the hope of future reunification of humans between North and South. On the limit of this research, this author noted "critical immanent approach" based on written sources in a situation of little interactions between North and South. To its complement, in case of Germany after unification, socio-psychological and psychotherapic researches on the old East Germans are being seriously undertaken, this author hope that such researches should be done in Korea. And a brief introduction of an encouraging aspect by psychotherapic researches on those who fled from North Korea and emigrated to South Korea was added.

FTN 신호를 적용한 DVB-T2 수신 성능 분석

박명철(Myung Chul Park),조봉균(Bong Gyun Jo),장은정(Eun-Jeong Jang),홍성원(Sung Won Hong),윤태현(Tae Hyun Yun),김치성(Chisung Kim),서은영(Eun Young Seo),한동석(Dong Seog Han) 한국통신학회 2016 한국통신학회 학술대회논문집 Vol.2016 No.1

간섭 제거와 수신 성능 향상을 위한 전처리기법을 적용한 LDC기반의 다중 사용자 다중 입출력 시스템

박명철(Myung Chul Park),조봉균(Bong-Gyun Jo),한동석(Dong Seog Han) 대한전자공학회 2013 전자공학회논문지 Vol.50 No.4

본 논문에서는 다중사용자 다중입출력 시스템에서 대역폭 효율의 감소 없이 페이딩에 대한 수신 성능을 향상시키는 부호화 알고리듬을 제안한다. 기존의 다중사용자 다중입출력 방식으로 사용되는 공간분할다중화 방식은 페이딩 경로에 취약하며, 이를 극복하기 위한 시공간블록부호화 방식은 전송량이 떨어지는 단점이 있다. 이러한 문제점을 개선하기 위하여 제안 부호화 알고리듬은 페이딩 환경에 강인하고 전송량이 송신 안테나 개수에 비례하여 증가하는 LDC(linear dispersion code) 기법을 이용하여 송신 심벌을 부호화하고, 예측한 채널 이득의 특이값 분해 값을 LDC 부호화 심벌에 전처리하여 성능을 개선한다. 그리고 컴퓨터 모의실험을 통하여 기존 알고리듬과 제안하는 알고리듬의 성능을 비교 평가한다. In this paper, a coding algorithm is proposed for multi-user multi-input multi-output (MU-MIMO) systems to improve the reception performance in fading conditions without reducing the bandwidth efficiency. The space division multiple access (SDMA) scheme that is one of the commonly used for MU-MIMO systems is vulnerable to the fading. The space time block code (STBC) scheme that is used to overcome the fading has a disadvantage of reduced throughput. The proposed MU-MIMO system first encodes transmitted symbols by linear dispersion code (LDC) which is less vulnerable to the fading and increases the throughput in proportional to the number of transmit antennas. Then, the LDC coded symbols are pre-coded by the result of singular value decomposition (SVD) of the estimated channel gain. We evaluate the performance of the proposed scheme compared with the conventional algorithms by computer simulations.

UHDTV 방송을 위한 공간 변조 다중 안테나 시스템 수신 성능 분석

박명철(Myung Chul Park),한동석(Dong Seog Han) 한국방송·미디어공학회 2015 방송공학회논문지 Vol.20 No.6

In this paper, the reception performance of spatial modulation multiple-output multiple-input (MIMO) is analyzed for high speed terrestrial broadcasting. The MIMO scheme is required to reduce the inter symbol interference (ISI) and spatial correlation. The spatial modulation scheme solves the problem of ISI, but the spatial correlation degrades the reception performance of SM scheme. The space-time block coded spatial modulation (STBC-SM) is combined the SM system with space-time block code (STBC) for reducing the effects of the spatial correlation. However, the STBC-SM scheme degrades the spectral efficiency by transmitting same data in the two symbol period. The double space-time transmit diversity with spatial modulation (DSTTD-SM) scheme transmits the data with full antenna combination. To adapt these SM MIMO systems into the terrestrial broadcasting system, the reception performance is analyzed using computer simulation in SUI channel environments.

0.18㎛ CMOS 공정을 이용한 WBAN용 비동기식 IR-UWB RF 송수신기

박명철(Myung Chul Park),장원일(Won Il Chang),하종옥(Jong Ok Ha),어윤성(Yun Seong Eo) 대한전자공학회 2016 전자공학회논문지 Vol.53 No.2

본 논문에서는 0.18㎛ CMOS 공정을 이용하여 WBAN(Wireless Body Area Network)용 IR-UWB(Impulse Radio Ultra Wide Band) RF 송수신기를 제안한다. 설계된 송수신기는 3-5GHz UWB low band를 지원하며 OOK(On-Off Keying) 변조방식을 사용한다. 수신기는 복잡도와 소모 전력을 줄이기 위해서 비동기식 에너지 검출 방식을 사용하였다. 원하지 않는 잡음을 제거하고 감도를 개선하기 위하여 RF active notch filter가 내장되어 있다. VCO 기반의 수신기는 switch mechanism을 사용하였다. 사용된 switch mechanism은 소모 전력을 줄이고 VCO leakage를 최소화 할 수 있다. 또한, 중심주파수가 변해도 항상 동일한 spectrum mask를 가진다. 측정된 수신기의 감도는 3.5 GHz의 중심주파수에서 1.579 Mbps의 전송 속도를 가질 때 –84.1 dBm을 가진다. 송신기와 수신기는 각각 0.3 nJ/bit, 41 mW의 소모 전력을 사용한다. In this paper, an Impulse Radio-Ultra Wide band RF Transceiver for WBAN applications is implemented in 0.18㎛ CMOS technology. The designed RF transceiver support 3-5GHz UWB low band and employs OOK(On-Off Keying) modulation. The receiver employs non-coherent energy detection architecture to reduce complexity and power consumption. For the rejection of the undesired interferers and improvement of the receiver sensitivity, RF active notch filter is integrated. The VCO based transmitter employs the switch mechanism. As adapt the switch mechanism, power consumption and VCO leakage can be reduced. Also, the spectrum mask is always same at each center frequency. The measured sensitivity of the receiver is –84.1 dBm at 3.5 GHz with 1.579 Mbps. The power consumption of the transmitter and receiver are 0.3nJ/bit and 41 mW respectively.

딥러닝 기반 OFDM 부반송파 간격 추정

박명철(Myung Chul Park),차대웅(Daewoong Cha),한동석(Dong Seog Han) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6

본 논문은 서로 다른 부반송파 간격을 가진 OFDM(orthogonal frequency division multiplexing) 기반 무선 통신 신호를 분별하기 위하여 MFB(multiple FFT window banks) 기반의 CNN(convolutional neural network) 모델을 제안한다. 기존 딥러닝 기반 ACM(automatic modulation classification) 모델은 단일 반송파 기반의 변조 방식에 대한 분류 정확성을 향상시켰다. 그러나 동일한 대역폭에서 서로 다른 부반송파 간격을 가진 OFDM 신호를 분류하지 못하는 문제점을 가진다. 본 논문에서 제안한 MFB 기반 CNN 모델의 분류 성능이 기존 시간영역에서의 IQ(in-phase and quadrature phase) 기반 CNN 모델과 A/P(amplitude/phase) 기반 LSTM(long-short term memory) 모델의 분류 성능보다 향상됨을 모의실험을 통하여 보였다.

위상 잡음 환경에 대한 ATSC 3.0 의 채널 추정 성능 분석

박명철(Myung Chul Park),한동석(Dong Seog Han) 한국통신학회 2018 한국통신학회 학술대회논문집 Vol.2018 No.1

채널 환경 변화에 따른 딥러닝 기반 자동 변조 분류기법 성능 분석

박명철(Myung Chul Park),차대웅(Daewoong Cha),한동석(Dong Seog Han) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.11

본 논문은 채널 변화에 따른 딥러닝 기반 AMC (automatic modulation classification) 분류 성능을 채널의 지연 확산과 다중경로의 개수에 따른 학습 데이터를 증강하여 성능을 분석하였다. 기존 딥러닝 기반 AMC 기법은 학습되지 않은 채널 환경에 대한 성능이 열화되는 문제점을 가지고 있어서 이를 해결하기 위한 학습 데이터 증강 방법에 대해 실험을 통해 분석하였다. 본 논문에서는 테스트 데이터의 지연 확산을 기준으로 학습 데이터 채널의 지연 확산을 변화하면서 시간 영역에서의 IQ (in-phase and quadrature phase) 기반 CNN (convolution neural network) 모델의 분류 성능을 모의실험을 통하여 분석하였다.

0.18㎛ CMOS 공정을 이용한 WBAN용 고집적 IR-UWB RF 송수신기

박명철(Myung Chul Park),장원일(Won Il Jang),이경학(Kyoung Hak Lee),어윤성(Yun Seong Eo) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6

This paper presents a fully integrated 3-5 GHz IR-UWB(Impulse Radio Ultra Wide Band) RF transceiver for WBAN (Wireless Body Area Network). WBAN transceiver is needed to requirement such as low power consumption and high data rate. To achieve the low power and low complexity, UWB transceiver is designed for OOK(On-off keying) modulation using energy detection. Receiver topology is a non-coherent energy detector and RF notch filter is integrated for the rejection of the undesired interferers below 2.4 GHz. IR-UWB signal is generated by using VCO and switch mechanism which reduce power consumption and VCO leakage. Each channel has same spectral mask and support to 500MHz bandwidth. It is fabricated in 0.18um CMOS and power supply is 1.8v. Sensitivity is - 84.1 dBm at 3.5GHz. Transmitter average and peak power are - 48.71 dBm/MHz and -13.79 dBm/50MHz when PRF is 15.6MHz. Receiver power consumption is 4.1mW and transmitter is 3.3mW.

하이브리드 시공간 블록 코드 기반의 공간 변조 다중 안테나 시스템

박명철(Myung Chul Park),주지훈(Jhihoon Joo),한동석(Dong Seog Han) 한국방송·미디어공학회 2015 한국방송공학회 학술발표대회 논문집 Vol.2015 No.7