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조기원,김규철,정종태,윤덕상,윤여태 한국육종학회 2024 한국육종학회지 Vol.56 No.1
The rice cultivar ‘Baekokhyang,’ a high-quality late maturing aromatic rice developed by Chungcheongnam-do Agricultural Research and Extension Services, was developed to cope with rising temperatures due to global warming and the market demand for various rice cultivars. ‘Baekokhyang’ was derived from a cross between ‘Ungwang,’ a multi-disease-resistant early-maturing rice cultivar as the maternal parent, and ‘Okhyangheugchal,’ an aromatic black rice as the paternal parent. Subsequently, a pedigree breeding method was used and yield trials were conducted from 2017 to 2018, followed by local adaptability tests from 2018 to 2019. ‘Baekokhyang’ is a late-maturing rice cultivar with the heading date of August 25th, demonstrating a slower maturation tendency compared to other medium-maturing cultivars, and this trait enables it to be ripened at an appropriate temperature after the heading date. ‘Baekokhyang’ exhibited tolerance to lodging, indicating high cultivation stability and more grains per panicle than ‘Samgwang. ’ Yield of milled rice was approximately 6.42 MT/ha under normal fertilizer levels in the local adaptability tests, which was 0.38 MT/ha higher than that of ‘Samgwang’. Additionally, the weight of 1,000 brown grains was 26 g which was 4.4 g heavier than that of ‘Samgwang’. The width/length ratio was 1.97, indicating the characteristic of long grains.The new rice cultivar ‘Baekokhyang’ is expected to enhance the competitiveness of rice production in Chungnam Province by diversifying the rice market which is currently dominated by non-glutinous and short-grain rice (Registration No. 8608).
부모의 자율성지지가 청소년의 그릿과 학업열의에 미치는 영향: 잠재성장모형을 활용한 종단매개효과 검증
조기원 한국청소년학회 2023 청소년학연구 Vol.30 No.9
본 연구는 청소년이 지각하는 부모의 자율성지지, 그릿, 학업열의의 종단적 관계와 그릿의 종단적 매개효과를 분석하는데 그 목적이 있다. 이를 위해 한국청소년정책연구원에서 제공하는 한국 아동·청소년패널조사 2018의 중1패널 1차년도(중1)부터 4차년도(고1)까지 4년 동안의 데이터에 잠재성장모형 분석을 실시하였다. 연구결과, 첫째, 부모의 자율성지지와 청소년의 그릿, 학업열의는 학년이 올라감에 따라 감소하였다. 둘째, 부모의 자율성지지 초기치와 변화율은 그릿과 학업열의 초기치와 변화율에 유의한 정적 영향을, 그릿 초기치와 변화율은 학업열의 초기치와 변화율에 유의한 정적 영향을 주는 것으로 나타났다. 셋째, 청소년이 지각한 부모의 자율성지지가 그릿을 매개로 학업열의에 간접적으로 정적인 효과를 보였다. 또한 중1에서 고1 기간 동안 부모의 자율성지지 변화율이 그릿 변화율을 매개로 학업열의에 종단적 매개효과가 확인이 되었다. 마지막으로 본 연구결과를 바탕으로 시사점을 논의하고 후속연구를 위한 제언을 하였다. The purpose of this study is to investigate the longitudinal mediating effect of grit in the influence of parental autonomy support perceived by adolescents on academic engagement. To this end, the four-year longitudinal data of the Korean Children and Youth Panel Survey 2018 were examined through the analysis of the latent growth model to examine the structure of variables over time. As a result of the analysis, first, parents' autonomy support, adolescents' grit, and academic engagement decreased as the grades increased. Second, the initial value and rate of change of parents' autonomy support in the first year of middle school had a significant positive effect on the initial value and rate of change of grit and academic engagement, and the initial value and rate of change of grit had a significant positive effect on the initial value and rate of change of academic engagement. Third, parents' autonomy support had an indirect positive effect on academic engagement through grit in the first year of middle school. Lastly, based on the results of this study, implications were discussed and suggestions were made for future research.
조기원,김수중 대한전자공학회 1982 전자공학회지 Vol.19 No.4
래티스 공식에 기초를 두어 선형 예측을 위한 새로운 알고리즘을 구하였다. 알고리즘의 출력은 all-po1e모델의 안정도를 보장하는 반사계수이다. 매 예측 단계에서 예측 오차의 공분산(cova.iance)을 순환적으로 계산하는 방정식이 유도되었고 이 식을 계산하는 과정에서 예측 계수에 관계없이 반사 계사를 추정하도록 하였다. 공분산 래티스(covariance-lattice)방법과 비교하였을 때 새로운 알고리즘은 계산의 량을 약 반으로 줄였으며 예측 차수가 높은 경우에 보다 효률적이 된다는 것을 설명하였다. A new algorithm, based upon a lattice formulation, is presented for linear prediction. The output of the algorithm is the reflection coefficients that guarantee the stability of the all-pole model. The equations are derived that compute the covariance of the residuals recursively at each prediction stage, and in processing of computing that eqations, the reflection coefficients are estimated without computing the predictor coefficients. Comparing with covariance-lattice method, it can be said that the new algorithm reduce the number of computations to about half and is more efficient for fitting of the high-order model.
이동통신 채널에서 OFDM을 적용한 TCM방식 비교분석
조기원,박성호 전남도립대학교 1999 전남도립대학교 논문집 Vol.S No.-
OFDM(Orthogonal Frequency Division Multiplexing) scheme can compensate for distortions caused by multipath delay spread and reduce the burst errors caused by the Doppler effect since OFDM signals have long symbol durations. However, OFDM is required to be improved for high speed data transmission and large capacity. Therefore, coding schemes should be combined with OFDM. In this paper, it was studied that the performance of OFDM transmission scheme was improved in mobile communication channel by applying TCM, which has advantages of error correction and bandwidth efficiency. Simulation was carried out for two TCM models with different code efficient length. By mapping two models to square 16QAM, the model with the code efficient length of 2 achieved 3dB better than the other for the BER of 10-3. In conclusion, if we want to achieve a better performance with TCM in OFDM applications, we should select a TCM with larger code efficient length.