The properties of powder metallurgy products are related to their densities. In the present work, we demonstrate a method to apply artificial neural networks (ANNs) trained on experimental data to predict the bulk density of barium titanates. The density is modeled as a function of pressure, press rate, heating rate, sintering temperature, and soaking time using the ANN method. The model predictions with the training and testing data result in a high coefficient of correlation (R2 = 0.95 and Pearson’s r = 0.97) and low average error. Moreover, a graphical user interface for the model is developed on the basis of the transformed weights of the optimally trained model. It facilitates the prediction of an infinite combination of process parameters with reasonable accuracy. Sensitivity analysis performed on the ANN model aids the identification of the impact of process parameters on the density of barium titanates.

본 연구는 사과 품종의 유전적 다양성을 분석하여 육종의 기초 자료로 활용하기 위하여 최근에 국내에서 육성된 품종 및 도입품종을 포함한 34품종을 대상으로 RAPD와 SSR 분석을 수행하였다. RAPD분석에서 총 37종의 선발된 임의 primer를 분석하여 193개의 다형성 밴드(36.2%)를 얻었으며, 평균 다형성 밴드 수는 5.6개였다. SSR 마커 26종을 이용하여 분석한 결과 총 112개의 대립인자가 확인되었고, 마커 당대립인자 수는 평균 4.3개

복숭아의 기원은 중국으로 알려져 있으며, 저장기간이 짧아 소비자들의 선호도가 낮았다. 이런 이유로 육종가들은 저장성을 높이는 것과 향과 맛을 좋게 하는데 육종 목표를 설정했으며, 국립원예특작과학원 육종가들은 이 목표에 따라 새로운 품종(‘천홍’, ‘수홍’, ‘하홍’, ‘유명’, ‘백미조생’, ‘천향’, ‘진미’, ‘수미’, ‘미스홍’, ‘유미’)을 육성하였다. 국립원예특작과학원 과수과에서는 육성 품종의 보호와 특허권을 확보하기 위해 분자생물학적 마커의

The ripening behavior of three apple cultivars, ‘Tsugaru’, ‘Hongro’ and ‘Fuji’ was distinctive and the involvement of POLYGALACTURONASE(PG) in the fruit softening process was confirmed to be ethylene dependent. Fruit softening is genetically coordinated by the action of several cell wall enzymes, including PG which depolymerizes cell wall pectin. Also, loss of firmness is associated with increasing of the ripening hormone, ethylene. In this work, climacteric ripening of three apple cultivars, Tsugaru, Hongro and Fuji, producing different ethylene levels and ripening responses, was examined. Correspondingly in Fuji, a linear and basal ethylene level was observed over the entire period of measurements, and Tsugaru and Hongro displayed a typical climacteric rise in ethylene production. Transcript accumulation of genes involved in ethylene biosynthesis (MdACS3 and MdACO1) and MdPG1 was studied in Tsugaru, Hongro and Fuji cultivars. Expression of MdACO1 transcripts was shown in all three ripened apple fruits. However, the MdACS3 and MdPG1 were transcribed differently in these cultivars. Comparing the MdPG1 of ‘Tsugaru’, ‘Hongro’ and ‘Fuji’, structural difference was discovered by genomic Southern analysis. Overall results pointed out that MdACS3 and MdPG1 play an important role in regulation of fruit ripening in apple cultivar.