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LED 모듈을 이용한 VLC(Visible Light Communication) 시스템의 성능향상 방안
조현묵,Cho, Hyun-Mook 한국전기전자학회 2018 전기전자학회논문지 Vol.22 No.3
본 연구에서는 온-오프 키잉 변조/복조를 기반으로 데이터의 전송속도를 30MHz 클럭 송신/수신할 수 있는 가시광 통신 시스템을 구현하였다. 구현된 시스템의 데이터 속도는 발광 다이오드/포토 다이오드 드라이버로 구성된 VLC 채널과 송/수신 플랫폼의 VLC 신호의 전송 및 수신에 대한 기능 시험을 통해 확인할 수 있었다. 그러나, VLC 송/수신 통합모듈에 대한 실험에서는 최대 전송속도가 15MHz로 측정되었다. 따라서, 본 연구에서는 실제 조명으로 사용할 수 있는 출력 15W 이상의 LED 모듈을 이용하여 가시광통신 시스템을 구현할 때 근본적으로 발생할 수 있는 문제점에 대해서 기술하고 개선 방안을 제안한다. In this paper, we implemented a VLC(Visible Light Communication) system capable of transmitting/receiving data on a 30MHz clock based on On/Off keying modulation/demodulation. The data rate of the implemented system can be verified by functional verification of VLC channel composed of LED/photodiode driver and VLC transmitting/receiving signal of Tx/Rx platform. But, In the experimental results with the VLC transmitting/receiving for combined module, the maximum transmission rate was measured at 15 MHz. Therefore, we describe the problems that can occur when implement the VLC system using the LED module with output power of 15W or more and propose ways to improve it.
單位生殖에 의한 감자 半數體植物 誘起 Ⅲ. 色素遺傳子 發現樣相에 따른 半數體植物 選拔
Hyun Mook Cho(趙賢默),Hei Young Kim Lee(金惠英),Il Gin Mok(睦一振) 한국육종학회 1993 한국육종학회지 Vol.25 No.1
Interspecific and Interploidal crosses were made between tetraploids and diploids to induce potato haploids. Tetraploids female parents were grouped into three different types according to the pigments on the stem. Pigments on seeds, seedlings and mature plants were used as phenotyphic markers to select haploids. Haploids were derived only from non-embryo spot seeds from all of the three types of the female parents. The positive selection for non-pigmented plants at seed and seedling stage was highly accurate to select haploid in the progenies of the female parents with green stem (group G), except the cv. Russet Burbank. Most of seedlings with white hypocotyl in the progenies of female parents with basal purple(group BP) or whole purple stem(group P), were haploids. However, 45.5% and 69.5% of the seedlings with white-purple hypocotyl derived from these groups were haploids, respectively. Because of the matroclinous effect of their female parents on plant pigmentation, the negative selection for purple pigmented plants at seed, seedling, growth and subsequently, harvest stage, was effective. As a consequence, a two step selection method was applicable for group BP and P ; select the seedlings with only white hypocotyl at seedling stage as haploids, and discard all the plants with purple pigments on the hypocotyl, stem and tuber skin according to gradual plant growth. Up to now, from 1,253 of non-embryo spot seeds, 199 haploid plants were confirmed by the phenotypic markers and subsequently root-tip chromosome counting. The efficiency of haploid induction through interspecific and interploidal crosses was affected by different tetraploids female parents.
裁培種 감자 半數體와 近緣野生種間 交雜에서 endosperm balance number(EBN)의 영향
조현묵(Hyun Mook Cho),김혜영(Hei Young Kim-Lee),엄영현(Young Hyun Om),김정간(Jung Kan Kim) 한국육종학회 1997 한국육종학회지 Vol.29 No.2
The effect of Endosperm Balance Number (EBN) in interploidal and interspecific crosses between S. tuberosum dihaploids and tuber-bearing wild species was investigated. The crossability was evaluated by the percentage of berry set and the average number of seeds per berry. The percentages of berry set were 11.5%, 11.4%, 7.4% and 2.2% in 4x×4x, 4x×2x, 2x×2x and 2x×4x crosses, respectively. The number of seeds per berry was in the same order as the percentages of berry set. The crossability was greatly affected by the ratio of the maternal and parternal EBN in the endosperm. The crosses with the maternal and parternal EBN ratio of 1 : 1, 1 : 1/2 and 4 : 1 in the developing endosperm did not produce hybrid seeds. However, a lot of plump hybrid seeds were produced only in 2 : 1 of EBN ratio irrespective of differences of the species used or ploidy levels of the parents.
감자의 4x×2x 종간교잡 후대 식물체의 배수성 차이에 따른 氣孔細胞의 量的形質 變化와 반수체식물 선발효과
Hyun Mook Cho(趙賢默),Hei Young Kim-Lee(金惠英),Il Gin Mok(睦一振) 한국육종학회 1994 한국육종학회지 Vol.26 No.1
To select haploids from the progeny plants obtained by interploidal and interspecific crosses of potatoes, stomatal cell characters were examined at three different growth stages as a potential indicator of ploidy level. The mean stomatal cell densities were 66.9, 45.0 and 38.5 per unit area(34 ㎛²) in haploid, triploid and tetraploid plants, respectively. The length and width of stomata were 27.5 : 18.8㎛, 34.3 : 21.0㎛ and 36.5 : 22.0㎛ in haploid, triploid and tetraploid plants, respectively. These characters had significant differences between ploidy levels with in the progeny plants but had relatively large quantitative variation within ploidy levels. On the other hand, the number of chloroplasts in a pair of guard cells, having the mean of 12.2, 18.4 and 20.2 in haploid, triploid and tetraploid plants, respectively, had large differences between ploidy levels with narrow variation within a ploidy level. These results indicated that counting chroloplasts in the guard cells among stomatal cell characters could be adopted as a rapid and accurate method for identifying haploids from large number of progeny plants of interploidal and interspecific crosses.