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Bi-LSTM 기반 CycleGAN을 활용한 음악 해석 생성 모델
고경민(Kyeong-min Ko),박종화(Jong-hwa Park) 한국정보통신학회 2023 한국정보통신학회 종합학술대회 논문집 Vol.27 No.1
다음 전자음악 시장은 점점 커지고 있으나 컴퓨터를 이용한 연주와 사람의 연주 사이 간격은 좁혀지지 않고 있다. 따라서 본 연구에서 AI를 통해 음악 해석을 생성함으로써 이 간격을 줄이고자 했다. 이를 위해 CycleGAN을 구조체로 사용하고 그 배누구조는 음악 데이터를 처리할 수 있도록 Bi-LSTM과 TimeDistributed layer를 활용해 모델을 설계하고 학습시켰다. 하지만 CycleGAN의 불안정한 학습 과정으로 인해 결과물에서 과적합이 발생했다. 향후 연구에서는 내부 구조와 손실함수 등을 변경하여 모드 붕괴를 해결할 수 있을 것이다. 또한 연주자의 정보에 해당하는 태어난 시대나 음악 양식을 직접적으로 활용한다면 보다 발전된 결과물을 얻을 수 있으리라 기대한다. The electronic music market is growing, but the gap between computer performance and human performance has not narrowed. Therefore, in this study, we tried to reduce this gap by generating music interpretation through AI. To this end, CycleGAN was used as a structure, and its internal structure was designed and learned using Bi-LSTM and TimeDistributed layer to process music data. However, due to the unstable learning process of CycleGAN, overfitting occurred in the results. In future studies, mode collapse can be solved by changing the internal structure and loss function. In addition, it is expected that more advanced results will be obtained by directly utilizing the era of birth or music style corresponding to the performers information.
Agrobacterium rhizogenes 에 의하여 형질전환된 인삼 모상근의 세포 유전학적 및 조직학적 특성
고경민(Kyeong Min Ko),송재진(Jae Jin Song),황백(Baik Hwang),강영희(Young Hee Kang) 한국식물학회 1993 Journal of Plant Biology Vol.36 No.1
Ginseng (Panax ginseng C.A. Meyer) hairy root transformed with Agrobacterium rhizogenes (strain A_4) was examined cytogenetically and histologically to assess its characteristics. The optimum growth of hairy root obtained in hormone-free MS medium (sucrose 30 g/L, pH 5-6) for long period cultures. All hairy root strains (HB1, HB2, HB3) had the 2n diploid number (2n = 48) of chromosomes in root tip cells. There were no alteration in chromosome structure except in one cell of HB3 strain. Results of SDS-PAGE showed a few difference in pattern and number of bands between normal and hairy root of ginseng. The root anatomy of normal root and hairy root differed each other. The hairy root had a clearly defined vascular strand, and the morphology of cortical cells were disorganised with large intercellular spaces.
2단계 배양방법을 이용한 인삼 모상근의 (毛狀根) 대량배양과 Ginsenoside 생산
고경민(Kyeong Min Ko),양덕춘(Deok Chun Yang),박지욱(Ji Chang Park),최강주(Kang Ju Choi),최광태(Kwang Tae Choi),황백(Baik Hwang) 한국식물학회 1996 Journal of Plant Biology Vol.39 No.1
A hairy root clone of Panax ginseng C.A. Meyer, HRB-15 was cultured in various conditions with 3 L bubble type bioreactor to enhance both growth and ginsenoside production. The hairy roots were more rapidly grown under the dark condition than under the light condition. However, total amount of ginsenoside of hairy roots cultured under the light for 30 days increased 2 folds as compared with the dark condition and was 1.10% based on 6 ginsenosides. Especially, ginsenoside-Re was significantly increased and some ginsenosides except for ginsenoside-Re was slightly reduced. Also, the growth of hairy roots decreased about 30% as compared with the dark condition. In contrast, addition of sodium acetate led to decreased production of ginsenoside and growth of hairy roots under ligt condition. The influence of potassium dihydrogenphosphate concentration was examined in MS medium and a 1.25 mM concentration was found to be the most appropriate for growth and ginsenoside production under light condition. Two-step process of hairy roots culture with yeast elicitation or without ammonia in culture medium was developed to enhance growth and ginsenoside synthesis. 50 ㎍ of yeast elicitor per g of fresh weight showed a synergistic effect on the ginsenoside synthesis of hairy roots on 20 days after culture. At that time, the content of total ginsenoside was 1.15%, while the growth of hairy roots decreased 21% as compared with the dark condition. In addition, when elimination of ammonia on 20 days after culture, the content of total ginsenoside was 1.26% with significant increment of ginsenoside-Rd (0.27%) in addition to ginsenoside-Re and the growth of hairy roots decreased 10% as compared with the dark condition. In this system, we have demonstrated a unique two-step process of hairy root cultures to maximize biomass and secondary metabolites. It has found possibility to enhance ginsenosides production by growing hairy roots in this method.
인삼 모상근 (毛狀根) 배양에 의한 Anthocyanin 의 생산과 동정
고경민(Kyeong Min Ko),최양순(Yang Soon Choi),황백(Baik Hwang) 한국식물학회 1994 Journal of Plant Biology Vol.37 No.1
In hairy root cultures of ginsegn (Panax ginseng C.A. Meyer) transformed by Agrobacterium rhizogenes, the effects of light, carbon source and various hormone on hairy root growth and anthocyanin production were investigated. Anthocyanine synthesis began to first occur 5 days after exposure to light, and then maximum yield of anthocyanin was 0.36 mg/g(frwt) in MS medium after 30 days. Of the nutritional factors concentration of 60 mM mitrogen and sucrose as a carbon source showed market effects on the growth and anthocyanin production MS medium supplemented with 0.5 mg/L IAA was most suitable for the hairy root proliferation, and the best accumulation of anthocyanin was obtained at 1 mg/L IAA treatment (0.41 mg/g, frwt). Whereas 2,4-D tended to restrain the pigment synthesis. From the isolation and identification of anthocyanin pigments, main anthocyanin in ginseng hairy root was identified as pelargonidin-glucoside.
PAM-4 수신기에 적용한 연속 근사 방식 적응형 문턱전압 제어
김봉규(Bong-kyu Kim),고경민(Kyeong-min Ko),강진구(Jin-Ku Kang) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.11
A successive approximation search scheme for an adaptive threshold voltage (Vth) control for PAM-4 receiver design is proposed to improve the Vth adaptation speed. For 10Gb/s PAM-4 receiver design, the proposed scheme achieves Vth control within 614㎱ with 65㎚ CMOS process.
Agrobacterium rhizogenes 에 의하여 형질전환된 인삼 ( Panax ginseng C. A. Meyer ) 의 모상근 배양에 의한 Saponin 생산
황백(Baik Hwang),고경민(Kyeong Min Ko),황경화(Kyeong Hwa Hwang),황성진(Sung Jin Hwang),강영희(Young Hee Kang) 한국식물학회 1991 Journal of Plant Biology Vol.34 No.4
Cultures of hairy root induced from ginseng(Panax ginseng C.A. Meyer) transformed with Agrobacterium rhizogenes (strain A_4, ATCC 15834) were established and morphologically two different hairy root strains (HB1, HB2) were obtained. To determine the optimum growth rate, the hairy root (HB2) was cultured in various liquid medium supplemented with or without plant growth hormone. The growth rate of hairy root cultured on MS medium was 1.3-3.1 times higher than those cultured on other media, and the optimum sucrose concentration and pH were 3-6%, 5.5-6.5, respectively. Also, the growth rate of hairy root was increased when 0.02 M ammonium nitrate, 1.2 mM potassium phosphate (monobasic) and 0.5 mg/l IBA were supplied to liquid medium. The saponin patterns and contents of hairy root (HB2) were determined by TLC and HPLC. The crude saponin contents were 4.67% and the total saponin contents were 1.0%, on dry weight basis.
벼 현탁배양을 통하여 분리된 원형질체로부터 식물체 재분화
정병균(Byung Gyun Jung),안준철(Jun Cheul Ahn),고경민(Kyeong Min Ko),김영준(Young Jun Kim),황성진(Sung Jin Hwang),황백(Baik Hwang) 한국식물학회 1993 Journal of Plant Biology Vol.36 No.3
Plant regeneration was accomplished from protoplast culture of rice (Oryza sativa L., cv. Taebaeg). Embryogenic callus was induced from mature seed on MS medium containing 5 mM proline, 2.5 mg/L 2,4-D, 30 g/L sucrose in the dark at 28℃ and used to establish embryogenic cell suspension culture. Suspension cells were subcultured every one week in N6 medium supplemented with 5 mM proline, 200 mg/L casein hydrolysate, 2.5 mg/L 2,4-D and amino acids of AA medium. Suspension cultures were composed of cells that were densely cytoplasmic, potentially embryogenic and were at least maintained for more than 6 months in liquid medium. Protoplasts were isolated from fast-growing suspension culture cells and cultured in a slightly modified KpR medium by mixed nurse culture. Isolated protoplasts began to divide within 5∼7 days and thereafter, protoplast-derived calli were sequentially transferred to callus proliferating medium that soft agar MS medium contained 2㎎/L 2,4-D and produced distinct embryogenic cells. Microcolonies were then transferred to solid medium which consisted of MS medium containing 5 mg/L kinetin, 1 mg/L NAA, 1 mg/L ABA, 30 g/L sucrose and 10 g/L sorbitol under fluorescent light. Multiple shoots of 4∼5 per callus emerged and were transeferred to hormone-free MS medium for root initiation. Thereafter, The plantlets were transferred to pots of soil to mature in the culture room.