본 연구는 우리나라에서 수수-수단그라스 교잡종 (sorghum bicolor L.: SSH)에 대해 극단기상과 정상기상 간 생산량을 비교할 목적으로 수행하였다. SSH 데이터 (n=1,025)는 농촌진흥청의 신품종 적응성 실험보고서(1979 ―2019)로부터 수집하였다. 기상자료는 기상청으로부터 평균기온, 최저기온, 최고기온, 최대 강수량, 누적 강수량, 최대풍속, 평균풍속 및 일조시간을 10일 기준으로 계산하 여 수집하였다. 극단기상과 정상기상 간 구별을 위해 상 자 그림을 이용하여 탐색하였다. 극단기상과 정상기상 간 생산량 차이는 5% 유의수준 하에서 t-검정 및 ANOVA를 통해 확인하였다. 그 결과, 극단기상은 극단적으로 강한 바람을 동반한 봄 가뭄, 극단적으로 높은 강우량을 기록 하는 여름장마와 가을장마가 두드러졌다. 예측 생산량 피 해(kg/ha)는 각각 1,961―6,541, 2,161―4,526 및 508― 5,582로 나타났다. 본 연구는 우리나라의 SSH에 대한 취 약성 및 피해 산정에 도움이 되는 기초자료로서 극단기상 과 정상기상 사이의 생산량 차이를 확인하는 데 의의가 있다.

To conduct numerical simulation of a disposal repository of the spent nuclear fuel, it is necessary to numerically simulate the entire domain, which is composed on numerous finite elements, for at least several tens of thousands of years. This approach presents a significant computational challenge, as obtaining solutions through the numerical simulation for entire domain is not a straightforward task. To overcome this challenge, this study presents the process of producing the training data set required for developing the machine learning based hybrid solver. The hybrid solver is designed to correct results of the numerical simulation composed of coarse elements to the finer elements which derive more accurate and precise results. When the machine learning based hybrid solver is used, it is expected to have a computational efficiency more than 10 times higher than the numerical simulation composed of fine elements with similar accuracy. This study aims to investigate the usefulness of generating the training data set required for the development of the hybrid solver for disposal repository. The development of the hybrid solver will provide a more efficient and effective approach for analyzing disposal repository, which will be of great importance for ensuring the safe and effective disposal of the spent nuclear fuel.

Electrochemical water splitting is an important process for next generation of eco-friendly energy systems. The oxygen evolution reaction (OER), which occurs at an anode during the process, requires efficient electrocatalysts to reduce activation energies. Although Ru- or Ir-containing materials show excellent electrocatalytic activities, their high cost is a critical drawback. Consequently, the development of efficient electrocatalysts composed of low-cost metal components is a great challenge. In this study, we develop a new route to produce a hybrid material (Fe–NC) containing Fe3C particles dispersed on the surface of N-doped carbon (NC) materials by heat treatment of a mixture of urea and Fe(II)Cl2(H2O)4. Microscopic analyses prove that the Fe3C particles are placed on the surfaces of thin NC materials. Additionally, various characterizations reveal that the particles contain Fe3C structure. Fe–NC shows good electrocatalytic properties with onset and overpotentials of 1.57 V and 545 mV, respectively, for OER in KOH electrolyte. This study suggests the possibility of the use of Fe3C- based composites as OER electrocatalysts.

The planting date of corn for silage has been delayed because of spring drought and double cropping system in Korea. This experiment was conducted to evaluate agronomic characteristics, forage production and feed value of corn at April and May in 2019. Experimental design was a split-plot with three replications. Planting dates (12 April and 10 May) were designated to the main plot, and corn hybrids (‘P0928’, ‘P1543’ and ‘P2088’) to the subplot. The silking days of the early planting date (12 April) was 79 days and that of the late planting date (10 May) was 66 days (p<0.0001), however, there were no significant differences among the corn hybrids. Ear height of the late planting date was higher than that of the early planting (p<0.05), while there were no significant differences in plant height of corn. Insect resistance at the early planting was lower than that of late planting (p<0.05), however, lodging resistance was no significant difference at planting date. The rice black streaked virus (RBSDV) infection of early planting was 3.7% and that of late planting was 0.3% (p<0.001). Dry matter (DM) contents of stover, ear and whole plant had significant difference at planting date (p<0.05). And differences in ear percentages were observed among the corn hybrids (p<0.01). And ear percentages of early maturing corn (‘P0928’) was higher than for other hybrids. Ear percentage at the early planting date was higher than that at the late planting date (p<0.01). DM and total digestible nutrients (TDN) yields had significant difference at planting date, however, there were no significant differences among the corn hybrids. DM and TDN yields at the late planting (21,678 kg/ha and 14,878 kg/ha) were higher than those of the early planting (13,732 kg/ha and 9,830 kg/ha). Crude protein content at the early planting date was higher than that of the late planting. Acid detergent fiber content of the late planting was lower than that of the early planting date (p<0.01), while there were no significant neutral detergent fiber content difference among the corn tested. Calculated net energy for lactation (NEL) and TDN at the early planting were higher than those of at the late planting (p<0.01). Results of this our study indicate that the late planting date (May) is better than early planting date (April) in forage yield and feed value of corn. Therefore, the delay of planting date by May was more suitable for use in cropping system.

Oxygen evolution reaction (OER) is an essential step at an anode in electrochemical water-splitting process and requires efficient electrocatalysts to reduce overpotentials. Although precious metal-based materials, such as RuO2, IrO2 and their hybrids with other components, performed excellently as OER electrocatalysts, their high cost has limited practical applications. Consequently, earth-abundant metal components including Fe, Co, and Ni have been investigated as alternatives. In this work, the hybridization of Ni-containing species with conductive carbon-based materials was used to prevent aggregation of active species and improve electrochemical catalytic performance. A new hybrid material composed of NiO nanoparticles and N-doped carbon materials was prepared. The NiO particles with a narrow size distribution were well dispersed on the surface of carbon-based materials. The hybrid showed improved electrocatalytic performance for OER than single components of NiO and N-doped carbon materials.

This study was conducted to evaluate the effects of different nitrogen levels on the yield and nutrient quality of a newly developed domestic hybrid of Teosinte, Geukdong 6〔Zea mays L. subsp. mexicana (Schrad.) H. H. Iltis〕. The field experiment was conducted in a randomized block design with three replicates and consisted of four nitrogen (N) application rates, T1 (200 kg/ha), T2 (300 kg/ha), T3 (400 kg/ha), and T4 (500 kg/ha). No differences were found in plant length, leaf length, leaf width, leaf number, dead leaves, stem hardness, tiller number, and fresh yield (p>0.05). The T3 showed significantly greater dry matter yield at harvest (heading stage) compared to the other treatments (p<0.05). The crude protein content of T4 (10.49%) was higher than those of T1 and T2 (p<0.05). However, there was no significant difference between T4 (10.49%) and T3 (9.63%). The effects on crude fat, crude ash, neutral detergent fiber (NDF), acid detergent fiber (ADF), and crude fiber were not significant (p>0.05). The sugar content was higher in the T2 treatment than the other treatments (p<0.05). For Ca, T3 showed significantly greater content (p<0.05). However, no significant effects were found in the contents of Cu, Fe, K, Mg, Mn, Mo, and Zn (p>0.05). Na content was higher in order of T2 > T4 > T3 > T1 (p<0.05). Total mineral contents were not significantly different among the treatments (p>0.05). Given these results, we recommend the amount of nitrogen fertilization necessary for “Geukdong 6” to be around 400 kg per ha (T3), when considering, high fresh yield, dry matter yield, number of leaves and content of crude protein.

본 시험은 사료용 수수×수단그라스 교잡종의 파종방법 및 제초제 종류에 따른 약해 및 생산성을 비교하여 안전 재배기술을 개발하고자 국립축산과학원 초지사료과 시험포 장에서 수행하였다. 제초제 종류별 수수×수단그라스 교잡종의 in vitro 조건 에서 발아율 분석결과 control > simazine > methaventhiazuron > alachlor 순으로 나타났으며 alachlor 처리시 shoot의 길이 는 1~1.3 cm 범위로 무처리 4.37 cm와 비교했을 때 약 1/4 배 정도로 짧은 것으로 나타났으며 root는 발생되지 않은 것으로 보아 alachlor는 shoot 보다 root에 약해를 더 심하 게 주는 것을 확인할 수 있었다. 포장시험에서 제초제 종류에 따른 약해는 in vitro 시험과 마찬가지로 alachlor에서 가장 심하게 나타났으며 파종 방법에서는 조파가 약해를 더 적게 받는 것으로 나타났다. 잔주수의 경우 alachlor와 simazine + alachlor에서 적었으며 제초제 처리시 파종방법에 따라 조파의 경우보다 산파에서 alachlor와 simazine + alachlor 처리에 따른 잔주수 감소가 더 크게 나타났다. 건물수량의 경우 제초제 종류별로 보면 조파의 경우 simazine과 methabenzthiazuron에서 각각 무처 리 대비 101%와 99%의 수량을 보였고 alachlor와 simazine + alachlor에서는 각각 무처리 대비 32%와 56%였다. 산파 의 경우 simazine과 methabenzthiazuron에서 각각 무처리 대 비 89%와 84%의 수량을 보였고 alachlor와 simazine + alachlor에서는 각각 무처리 대비 13%와 29%로 나타났으 며, alachlor 보다 simazine과 methabenzthiazuron이 건물수 량 감소가 적었으며 제초제 처리시 산파보다 조파가 alachlor에 대한 약해를 덜 받는 것으로 나타났다. TDN 수 량 역시 건물수량과 비슷한 경향을 보였으며 alachlor와 simazine + alachlor 모두에서 TDN 수량이 가장 낮게 나왔 으며 제초제 처리시 산파보다는 조파의 경우가 제초제 시 용에 따른 수량감소가 적은 것으로 나타났다.

본 시험은 사료용 수수×수단그라스 교잡종의 파종방법 및 제초제 종류에 따른 약해 및 생산성을 비교하여 안전 재배기술을 개발하고자 국립축산과학원 초지사료과 시험포장에서 수행하였다. 제초제 종류별 수수×수단그라스 교잡종의 in vitro 조건에서 발아율 분석결과 control > simazine > methaventhiazuron > alachlor 순으로 나타났으며 alachlor 처리시 shoot의 길이는 1~1.3 cm 범위로 무처리 4.37 cm와 비교했을 때 약 1/4배 정도로 짧은 것으로 나타났으며 root는 발생되지 않은 것으로 보아 alachlor는 shoot 보다 root에 약해를 더 심하게 주는 것을 확인할 수 있었다. 포장시험에서 제초제 종류에 따른 약해는 in vitro 시험과 마찬가지로 alachlor에서 가장 심하게 나타났으며 파종방법에서는 조파가 약해를 더 적게 받는 것으로 나타났다. 잔주수의 경우 alachlor와 simazine + alachlor에서 적었으며 제초제 처리시 파종방법에 따라 조파의 경우보다 산파에서 alachlor와 simazine + alachlor 처리에 따른 잔주수 감소가 더 크게 나타났다. 건물수량의 경우 제초제 종류별로 보면 조파의 경우 simazine과 methabenzthiazuron에서 각각 무처리 대비 101%와 99%의 수량을 보였고 alachlor와 simazine + alachlor에서는 각각 무처리 대비 32%와 56%였다. 산파의 경우 simazine과 methabenzthiazuron에서 각각 무처리 대비 89%와 84%의 수량을 보였고 alachlor와 simazine + alachlor에서는 각각 무처리 대비 13%와 29%로 나타났으며, alachlor 보다 simazine과 methabenzthiazuron이 건물수량 감소가 적었으며 제초제 처리시 산파보다 조파가 alachlor에 대한 약해를 덜 받는 것으로 나타났다. TDN 수량 역시 건물수량과 비슷한 경향을 보였으며 alachlor와 simazine + alachlor 모두에서 TDN 수량이 가장 낮게 나왔으며 제초제 처리시 산파보다는 조파의 경우가 제초제 시용에 따른 수량감소가 적은 것으로 나타났다.

To meet the needs of customer, manufacturing companies are diversifying product making methods. In order to adapt to changes, companies are trying to find a new manufacturing system. In this research, MTS(Make to Stock) and MTO(Make to Order) production m

진한 붉은색을 띤 ‘Tiny Ghost’를 교배모본으로 Oriental group, Longiflorum group 및 Martagon group을 부본으로 하여 효율적인 종간잡종 생산과 상 품성 있는 신품종을 획득하고자 실험을 수행하였다. 개 화당일 채취한 화분의 발아율은 Oriental hybrid인 ‘Sorbonne’이 64%로 가장 높았다. 주두수분법과 화주 절단수분법을 이용하여 수분한 결과, ‘Aktiva’를 부본 으로 사용한 경우를 제외하고 모두 주두수분법을 사용 한 교배에서 자방이 생성되었다. 또한 Longiflorum group 인 ‘Norina’와 ‘Gelria’ 중 화분발아율이 높은 ‘Norina’ 가 모두 수정에 실패하여 같은 group 내에서도 종간 의 유전적 친화성에 따라 수정률이 달랐다. ‘Aktiva’를 부본으로 한 교배에서 1개의 embryo sac을 적출하여 1개 의 구를 생성하였으며, ‘Sorbonne’을 부본으로 한 교배 에서는 4개의 ovule을 치상하여 1개의 구를 얻었다. ‘Gelria’를 부본으로 한 교배에서는 1개의 자방에서 embryo 5개, embryo sac 15개, ovule 7개를 얻었으며 그 중 18개체가 발아하여 66.7%의 발아율을 나타내었다. Martagon group인 L. hansonii를 부본으로 한 교배에 서는 5개의 ovule을 얻어 그 중 40%가 발아하였다.

A field experiment was conducted to evaluate growth characteristics, forage production and crude protein yield according to cutting time of Soghum Sudangrass Hybrid, and decide ideal harvesting time for use of soiling and silage. Experiment design was arr

Many production management systems for increasing productivity, minimizing inventory, keeping due dates and maximizing use of resources have been proposed, and GT, MRP and JIT are frequently used among these systems. The three systems have merits and demerits through comparing with each other. Because each system has mutual dependence, a hybrid production system is necessary for using their merits maximally. In this study, a hybrid production system is designed by combining GT, MRP and JIT, which is suitable in the domestic production system.

Many production management systems for increasing productivity, minimizing inventory, keeping due dates and maximizing use of resources have been proposed, and GT, MRP and JIT are frequently used among these systems. The three systems have merits and demerits through comparing with each other. Because each system has mutual dependence, a hybrid production system Is necessary for using their merits maximally. In this study, a hybrid production system is designed by combining GT, MRP and JIT, which is suitable in the domestic production system and it is presented as followings. -. Basic research works for G7, MRP and JIT. -. Comparison and analysis are carried out for each system.- . The hybrid production system is designed. -. The hybrid production system is developed.