소형 및 초소형위성 활용을 위한 200 W 이하 저전력 홀 전기추력기 연구개발

이동호(Dongho Lee),김호락(Holak Kim),도근태(Guentae Doh),김영호(Youngho Kim),박재홍(Jaeghong Park),이재준(Jaejun Lee),최원호(Wonho Choe) 한국추진공학회 2021 한국추진공학회 학술대회논문집 Vol.2021 No.11

콩의 개화기 전후 공급과 수용부위의 생장반응과 수량에 대한 질소의 효과

박재홍,송범헌,이철원,손석용,김홍식,박상일 忠北大學校 農業科學硏究所 2002 農業科學硏究 Vol.19 No.-

This study was conducted to examine the nitrogen effects on the growth responses, the nodulation, and the distribution of dry weight of plant tissues at major growth stages before and after the flowering stage, and to evaluate the yield components and yields with different nitrogen levels. Hwangkeum cultivar(Glycine max L mereill) was cultivated under five different nitrogen levels, 0, 2, 4, 6, 8, N Kg/10a. Stem length and branching number, which were investigated with different N levels at major growth stages, were rapidly increased for 14days for before and after the flowering stage compared to the other growth stages. They were clearly higher with treatment of 2 and 4 N kg/10a than those of other N treatments. Pod number was slightly increased from the flowering to beginning maturity. It was the highest in the treatment of 2 N Kg/10a. Comparing grain number per pod with different N levels, two grains per pod was much higher in all N treatments except for the treatment of 6 N Kg/10a. Dry weight of shoot(including leaf, stem, and pod) was rapidly increased from the flowering stage to the full seed stage and then gradually increased after the full seed stage, whereas the dry weight of root(including the nodule and root) was rapidly increased until to full pod stage and then linearly decreased from the full pod stage until the beginning maturity stage. Comparing dry weight with different N levels, the dry weight of shoot was the highest in the treatment of 4 N Kg/10a, while it of root was the highest in the treatment of 2N Kg/10a. The dry weight of nodule was the highest, 13.1 Kg/10a, at full pod stage. Comparing the dry weight of nodule with different N levels, it was increased to the application amount of 4 N Kg/10a and then clearly decreased with more application amount of N than 4 Kg/10a. The yield components which were mostly affected to the yield were pod number per plant and grain number per plant. They were 57.5 and 106.1, respectively, with treatment of 4 N Kg/10a, which showed the highest yield, about 266 Kg/10a. Comparing yield index with different N levels to the control, the yields with treatment of 2 and 4 Kg/10a were increased to 21% and 34%, respectively.

콩의 개화기전후 공급과 수용부위의 무기영양성분함량 및 흡수량에 대한 질소의 효과

박재홍,송범헌,이철원,손석용,김홍식,박상일 忠北大學校 農業科學硏究所 2002 農業科學硏究 Vol.19 No.-

This study was conducted to examine the nitrogen effects on the uptaken amounts and utilization of mineral nutrients between source and sink tissues at major growth stages before and after the flowering stage with different nitrogen levels Hwangkeum cultivar(Glycine max L Mereill) was cultivated under five different mtrogen levels, 0, 2, 4, 6, 8 N kg/10a Comparing contents of total-N with different plant tissues at major growth stages before and after the flowering, total-N contents of leaves was gradually decreased from the flowering to the beginning maturity, while it of pod was continuously increased from the full seed to the beginning maturity Total-N content was higher in the treatment of 4 N Kg/10a that those of others The uptaken amount of N determined with different growth stage was rapidly increased maturity Higher proportion of uptaken N were into the leaves at the full seed stage, and they were transported from the leaves into pod at the beginning maturity stage Comparing major mineral elements of the leaves and the pod with different N leaves, in case of the leaves, the content of Fe, Mn, and Zn was decreased throughout the growth stages, whereas the content of Ca and Mg was decreased from the flowering to the full seed and then it was increased after the full seed stage In case of pod, the content of K, Fe, Mn, Zn, and Na was decreased from the flowering to the beginning maturity, while contest of Mg was increased.

신도시 자족기반 구축 방안에 관한 연구

朴宰弘,崔亨碩 水原大學校 2005 論文集 Vol.23 No.-

This study aims to establish the strategy for constructing the self-sustained infra-structures in building new town. Based on the academical researches as well as the empirical analysis of the standard foreign self-sustained cities, regional innovation facilities, such as research park and business incubator, are the most significant factors to the guarantee self-sustained function of the new town. Regional and local governments should invest budget to the regional innovation complex within the new town to complete the self-sustained function gradually. Also, development companies based on the government must try to reduce the cost for the land of innovation complex to contribute to set up the self-sustained function of the new town.

Spirometra erinacei의 發育에 따른 Alkaline phosphatase와 Lactate dehydrogenase의 酵素 組織化學的 硏究

朴裁弘,徐淑才,金昌煥 慶尙大學校 기초과학연구소 1990 基礎科學硏究所報 Vol.6 No.-

Spirometra erinacei의 제3기 유충 plerocercoid(Sparganum)를 전이숙주인 흰쥐와 종숙주인 고양이에 감염시켜서 회수한 sparganum과 성충의 alkaline phosphatase와 lactate dehydrogenase(LDH)의 분포 및 동위효소 pattern을 비교하기 위하여 효소조직 화학적 방법과 전기영동법을 이용하여 다음과 같은 실험 결과를 얻었다. 1. Alkaline phosphatase는 sparganum과 성체의 표피층과 표피근층에서 많은 분포를 보였으며 실질근층에도 상당한 분포가 있었다. Isozyme band pattern은 sparganum에서 2개 성체에서 4개가 분리 되었는데, sparganum과 성체 모두 2번 band가 major band였다. 2. LDH는 sparganum의 표피근층과 성체의 표피근층에 많이 분포되었고, sparganum의 실질근층과 표피층에는 거의 분포되지 않았다. LDH의 isozyme band pattern은 sparganum과 성체에서 각각 1개의 band가 분리되었다. This study was performed to investigate distribution and isozyme band pattern of Alkaline phosphatase and Lactate dehydrogenase on developing Spirometra erinacei (sparganum, adult) recovered from sparganum infected rats and cat. The result obtained were as follows ; 1. Alkaline phosphatase had a strong activity in the tegument and the epidermal musculature of sparganum and of adult, but no detectable level in the parenchymal musculature. 2. Two and four Alkaline phospatase isozyme bands were found in sparganum and adult respectively. of these bands, band 2 was major band in sprarganum and adult. 3. The high activity of Lactate dehydrogenase was found in the tegument and epider mal musculature of adult and epidermal musculature of sparganum, but no detctable level in tegumemt and parenchymal musculature of sparganum. 4. Only one lactate dehydrogenase isozyme band was detectable in sparganum and adult.

저항방사열계 적외선 감지기 제조를 우한 바나듐 산화막의 전기적 특성 및 유전 특성

박재홍,최용남,최복길 공주대학교 생산기술연구소 2000 論文集 Vol.8 No.-

For fabrication of bolometric infrared detector, thin films of vanadium oxide(VO_x) was deposited by r.f. magnetron sputtering from V_2O_2 target in 10% gas mixture of argon and oxygen, and in-situ annealed in vacuum with different temperatures and times. Crystal structure and surface morphology of films were characterized through XRD and SEM. In order to measure the current-voltage characteristics, temperature dependence of conductance, and dielectric properties of vanadium oxide, Al/VO_x/Al sandwich devices structure was adopted. The films prepared below 200℃ were amorphous, and those prepared above 300℃ were polycrystalline. Above 3×10^4V/cm conduction of vanadium oxide is limited by space charge formed near eletrode. Conduction mechanisms above 10^5V/cm are due to Schottky emission and Fowler-Nordheim tunneling effects. Resistance and capacitance of grain boundary are decreased with increasing annealing temperature. Oxygen vacancy is related to the localized state and non-stoichiomeric of vanadium oxide.

반전형 비정실 실리콘 박막트랜지스터의 2차원 Simulation

김철주,박재홍 서울市立大學校 1993 論文集 Vol.27 No.-

In this paper, we presented the distributions of both electron concentration and electrostatic potential through 2-dimensional simulation according to the terminal voltage in the inverted-type a-Si TFT. Device model for 2-dimensional simulation was based on charge-trapping model, and both electron concentration and electrostatic potential were solved by finite difference method(FDM). In these results, even under zero-bias condition was electron distribution, about above ?? , formed in the middle of a-Si bulk. And as gate voltage is applied to gate terminal, high electron concentration is distributed not only on the interface, between gate insulator and a-Si bulk, but at inner a-Si bulk. By this we confirmed that charges induced by the applied field can move into the inner a-Si bulks enough.

저항방사열계 적외선 감지기 제조를 위한 바나듐 산화막의 전기적 특성 및 유전 특성

박재홍,최용남,최복길 공주대학교 생산기술연구소 2000 論文集 Vol.8 No.-

For fabrication of bolometric infrared detector, thin films of vanadium oxide(VO_(X)) was deposited by r.f. magnetron sputtering from V_(2)O_(5) target in 10% gas mixture of argon and oxygen, and in-situ annealed in vacuum with different temperatures and times. Crystall structure and surface morphology of films were characterized through XRD and SEM. In order to measure the current-voltage characteristics, temperature dependence of conductance, and dielectric properties of vanadium oxide, Al/VO_(X)/Al sandwich devices structure was adopted. The films prepared below 200℃ were amorphous, and those prepared above 300℃ were polycrystalline. Above 3×10^(4)V/cm conduction of vanadium oxide is limited by space charge formed near electrode.? Conduction mechanisms above 10^(5)V/cm are due to Schottky emission and Fowler-Nordheim tunneling effects. Resistance and capacitance of grain boundary are decreased with increasing annealing temperature. Oxygen vacancy is related to the localized state and non-stoichiomeric of vanadium oxide.

蛇行 河川에서 洪水波의 傳達 特性 解析

朴在弘,孫廣翼,韓健淵 경북대학교 산업기술연구소 1993 産業技術硏究誌 Vol.21 No.-

Unsteady flow in a natural river which meanders through a wide flood plain is complicated by large differences in hydraulic resistance and cross sectional geometry of the river channel and the floodplain. The unsteady flow is further complicated by the tendency for a portion of the flow to short-circuit along the more direct route afforded by the flood plain rather than following the longer route along the meandering channel. A mathmetical model for routing floods in meandering river with floodplains is presented. The one-dimensional equations modified such that the flow in the meandering channel and floodplain are identified separately. The floodplain model has been used to simulate flow in an idealized meandering river with a flood plain. Flood peak attenuation and travel time are found to increase as flood-plain roughness and width increase and as channel sinuosity decrease. Attenuation increase and travel time decreases as the flood plain flow increases.

혼합치열기 어린이에서 mutans streptococci에 대한 자일리톨 껌의 향균효과에 관한 연구

박재홍 大韓小兒齒科學會 2007 大韓小兒齒科學會誌 Vol.34 No.4

Xylitol 껌의 mutans streptococci(MS)에 대한 항균효과를 평가하기 위하여 6세∼11세 사이의 혼합치열기 어린이 62명을 선정하였다. 4개월 동안 1개의 xylitol 껌을 하루 3회 씹는군,2개의 xylitol 껌을 하루 3회 씹는 군과 xylitol 껌을 씹지 않는 대조군으로 나누어 하루 3번 식후 최소 5분간 껌을 씹게 한 후 1개월 간격으로 자극성타액을 채취하여 선택배지 (mitis salivarius kanamicin bacitracin agar)에 배양한 후 MS 군락 수의 감소를 평가하였다. 1회 1개의 xylitol 껌을 씹는 군에서는 MS의 감소를 보이지 않았고,1회 2개의 xylitol 껌을 씹는 군에서 4개윌째 MS의 유의한 감소를 보였다(P < 0.05). 따라서 혼합치열기 어린이의 경우 하루 3회,총 10g 정도의 xylitol을 4개월 이상 꾸준히 사용하였을 경우 치아우식증에 대한 예방효과가 있을 것으로 사료된다. The purpose of this study was to investigate the effect of xylitol chewing gums on mutans streptococci(MS) counts in saliva. Sixty two children 6 to 11 years old were randomly assigned into one of three groups, Stimulated saliva specimens were plated in duplicate on conventional selective culture (mitis salivarius kanamycin bacitracin agar) for mutans streptococci. Polymerase chain reaction (PCR) amplication was performed to identify MS. After the 4-month period a significant decrease of the MS counts occurred in the group B (two gum 3 times a day: P < 0.05) but not in group A (one gum 3 times a day) and control group (didn t receive xylitol gum). According to qualitative evaluations, xylitol use did reduce the levels of MS in mixed dentition children. It has been suggested that a daily intake of 2 tablet for 3 times a day (about lOg) is needed in order to obtain a clinical anticariogenic effect.