• 한국군사과학기술학회지
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• 제14권1호
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• pp.1-8
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• 2011

In this paper, dual-feed circularly polarized microstrip patch antenna for GPS L1, GPS L2, GLONASS L1 signal was fabricated by using stacked patch. It was fed by dual coaxial probe on the patch at 50ohm impedance, and was simulated to resonate at GPS L1, GPS L2, GLONASS L1. To realize characteristics of right hand circular polarization using dual-feed stacked patch antenna and hybrid coupler for $90^{\circ}$ phase difference. Output of hybrid coupler was contacted input of Low Noise Amplifier(LNA). The LNA using dual band pass filter was designed and fabricated. The measured results of the implemented antenna is VSWR < 1.5 : 1 and the gain of 32dB(Zenith) over at GPS L1, L2, GLONASS L1.

• 천문학논총
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• 제20권1호
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• pp.1-5
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• 2005

We report molecular line observations of CO(1-0), $^{13}CO(1-0)$, CS(2-1), and HCN(1-0) with SRAO 6m telescope toward L1014-IRS which is thought to be a very faint infrared source embedded in previously known 'starless' core L1014. The CO(1-0) observations find several components with different velocities along the line of sight of L1014, $4km\;s^{-1}$ and between $40{\sim}50km\;s^{-1}$. We find a parsec scale CO molecular outflow at the $4km\;s^{-1}$ component for the first time the direction of which is coincident with that of the small scale (${\sim}500pc$) outflow previously found. Although the observation is not covered for whole area of the outflow, the size of the molecular outflow seems not very inconsistent with the expected age of L1014-IRS. More accurate size and shape of the molecular outflow from L1014-IRS will be determined from the full coverage mapping in CO over the outflow region in very near future.

• Journal of applied mathematics & informatics
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• 제23권1_2호
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• pp.537-545
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• 2007

We investigate complemented Banach sublattices of the Banach envelope of $Weak_L1$. In particular, the Banach envelope of $Weak_L1$ contains a complemented Banach sublattice that is isometrically isomorphic to a nonseparable Banach lattice $l_p(S),\;1{\leq}p<{\infty}\;and\;|S|{\leq}2^{{\aleph}0}$.

• 대한수학회논문집
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• 제37권3호
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• pp.635-648
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• 2022

In this paper, we establish an asymptotic formula for mean value of $L^{(k)}({\frac{1}{2}},\;{\chi}_P)$ averaging over ℙ_2g+1 and over ℙ_2g+2 as g → ∞ in odd characteristic. We also give an asymptotic formula for mean value of $L^{(k)}({\frac{1}{2}},\;{\chi}_u)$ averaging over 𝓘_g+1 and over 𝓕_g+1 as g → ∞ in even characteristic.

• Journal of Plant Biotechnology
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• 제2권3호
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• pp.151-155
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• 2000

Shoot proliferation was obtained from shoot tips and nodal explants of Vitex negundo L. on MS medium supplemented with either BAP or KIN (0.1-2.0 mg/L) alone or in combination with NAA (0.1 mg/L). The concentrations of cytokinins combined with NAA produced multiple shoots from shoot tips and nodal explants. The highest mean percentage (84.3$\pm$8.0) of shoot multiplication's were observed on nodal explants in the presence of BAP (1.5 mg/L) and NAA (0.1 mg/L) followed by shoot tips (65.0$\pm$5.0). The regenerated shootlets were rooted on MS basal medium IAA, IBA, NAA (0.1-1.5 mg/L). The maximum number of roots (51.0$\pm$2.6) was achieved on the medium containing IBA (1.0 mg/L) followed by other auxins (NAA, IAA). The regenerated plants were successfully transferred to a mixture of vermiculate and soil. About 95% of the plantlets survived when transferred to the field.

• 생명과학회지
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• 제27권10호
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• pp.1104-1110
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• 2017

히스톤 H3K4의 메칠화는 3T3-L1의 지방세포의 분화를 촉진하는 것으로 알려져 있으나, 히스톤 H3K4 메칠화 효소인 SET1A가 지방세포 분화를 조절하는지에 대해서는 보고된 바가 없다. 그러므로 본 연구에서는 SET1A의 3T3-L1 지방세포의 분화조절과 기전을 연구하였다. SET1A의 발현은 3T3-L1 지방세포 분화과정에서 증가함을 관찰하였다. 3T3-L1 지방전구세포에서 siRNA을 이용하여 SET1A의 발현을 감소시키면 3T3-L1 지방전구세포의 분화가 억제됨을 관찰하여 SET1A가 3T3-L1 지방전구세포의 분화를 촉진함을 알 수 있었다. 이에 대한 조절기전을 알기 위해, SET1A의 발현을 감소시킨 3T3-L1 지방전구세포의 세포증식을 측정한 결과, 분화 초기 단계인 분화 후 2일 동안 3T3-L1 지방세포의 증식이 감소하였다. 또한 분화 후 7일 동안 지방세포세포 분화 조절인자들의 발현을 측정한 결과, SET1A의 발현을 감소시킨 3T3-L1 지방세포에서 $PPAR{\gamma}$의 발현이 감소하였다. 위와 같은 연구결과를 바탕으로, SET1A는 분화초기단계에서는 mitotic clonal expansion 단계를 촉진하고, 분화후기단계에서는 $PPAR{\gamma}$의 발현을 증가시켜 3T3-L1 지방세포의 분화를 촉진함을 알 수 있었다.

• 해양환경안전학회지
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• 제20권5호
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• pp.535-542
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• 2014

본 연구에서는 해상교통혼잡도에 영향을 미치는 요소인 선박점용영역크기, 선박의 속력, 항로폭에 대한 민감도 분석을 실시하였으며, 가장 민감한 요소로 선박점용영역을 도출하였다. 선박점용영역에 대해 일본, 덴마크 해협, 중국 상하이항에서의 점용영역에 대한 기존 연구사례를 조사하고, 우리나라 진해만 피항시의 해상교통관측조사를 통한 선박점용영역을 도출하여 비교 분석하였다. 민감도 분석결과, 선박속력 1노트 변화시 10 %, 항로폭 100미터 변화시 18 %, 점용영역 장직경 1L 변화시 34 %~43 %의 영향이 미치는 것으로 분석되었다. 그 결과, 현행 진단제도에서 사용하는 $8L{\times}3.2L$, $6L{\times}1.6L$은 일본의 $3.5L{\times}1.5L$, 중국 상하이항 $5.9L{\times}2.2L$, 덴마크 해협 $4L{\times}5B$ 및 진해만 피항시의 선박점용영역 $3L{\times}2L$과 큰 차이가 있음을 확인하였다.

• 상하수도학회지
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• 제22권6호
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• pp.705-714
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• 2008

Three Mesh Screenning Reactors (MSRs) were operated in three different modes to investigate the effect of the mesh opening size and the filtrate flux on the removal of particulate matters and the production of soluble organic matters. The mesh opening size was $82{\mu}m$ (Mode 1), $61{\mu}m$ (Mode 2) and $38{\mu}m$ (Mode 3), respectively, and each mode has three different filtrate flux; $0.47m^3/m^2/d$, $0.95m^3/m^2/d$ and $1.42m^3/m^2/d$, respectively. TSS removal efficiency of mode 1, 2, and 3 fed with 191 mgTSS/L was 27%, 36%, and 60%, respectively. The SCOD concentration of 91mg/L in influent for the mode 1, 2, and 3 increased to 117 mg/L, 127 mg/L, and 155 mg/L, respectively. For the all MSRs, there was no significant effect of filtrate flux on the removal of particulate matters and the production of soluble organic matters. However, the mesh opening size greatly affected the removal of particulate matters and the production of soluble organic matters in wastewater. Three parallel A2O processes consisting of anaerobic, anoxic and aerobic reactors maintaining mixed liquor suspended solids (MLSS) of 3,000 mg/L were operated to investigate the effectiveness of MSR on the removal efficiencies of the organic matters, nitrogen, and phosphorus; MSR influent was introduced to System 1 (183 mgTSS/L, 324 mgTCOD/L, 87 mgSCOD/L, 45.2 mgTKN/L, and 6.6 mgTP/L) and MSR efluent was introduced to System 2 and 3(72 mgTSS/L, 289 mgTCOD/L, 141 mgSCOD/L, 40.2 mgTKN/L, and 4.2 mgTP/L). HRTs of the anaerobic reactors in systems 1, 2 and 3 were 1 h, 1 h and 0.6 h, respectively and anoxic reactors were 2 h in all systems. HRTs of the aerobic reactors in systems 1, 2 and 3 were 5 h, 3 h and 3 h, respectively. TSS concentration in effluent of both system 2 and 3 is about 8 mg/L and lower than that of system 1 effluent. Despite higher TCOD loading and SCOD loading, both Systems 2 and 3 had a greater TCOD and SCOD removal efficiency at 91% and 92% than System 1 was at 88% and 82%, respectively. The nitrification efficiency for system 2 was greater than observed for System 1 (99% verses 97%). The denitrification efficiency for systems 1, 2 and 3 was 78%, 88% and 87%, respectively. System 2 and 3 showed about 12% higher TN removal efficiency than system 1 (85% verses 73%). The effluent TP concentration for system 2 was less than observed for system 1 and 3.

• 한국식품과학회지
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• 제20권4호
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• pp.518-525
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• 1988

두유를 L. casei로 젖산발효시킬 때 L. casei 단독발효와 효모인 K. fragilis와의 혼합발효에 대하여 검토하였다. 그 결과두유를 L. casei로 단독발효한 경우 보다 K. fragilis와 혼합발효한 경우 산생성량이 많고 산생성속도가 빨랐다. 이 두균을 혼합배양하여 산생성을 높이기 위한 발효조건은 두유에 sucrose를 1.0% 또는 skim milk를 2.0%첨가하고 L. casei와 K. fragilis를 O.D 660값으로 $1\;:\;5{\sim}1\;:\;9$되게 접종하여 $35{\sim}37^{\circ}C$의 온도에서 24시간 발효하는 것이 효과적이었다. 두유를 L. casei로 단독발효 한 경우와 L. casei와 K. fragilis로 혼합발효한 경우의 산도는 각각 0.31%와 0.44%로서 혼합발효한 경우가 1.42배 높았다. sucrose를 1.0% 첨가한 두유를 사용하였을 경우는 각각 0.43%와 0.97%로서 혼합발효한 경우가 2.26배 높았다. 그리고 skim milk를 2.0% 첨가한 두유를 사용하였을 경우는 각각 1.05%와 0.99%로서 L. casei로 단독발효한 것과 K. fragilis와 혼합발효한 것 사이에 차이가 없이 같은 수준을 나타내었다. 단지 skim milk를 1.5%이하로 첨가했을 때만 L. casei로 단독발효한 것보다 K. fragilis와 혼합발효 한 것이 산생성량이 많았다.

• Biotechnology and Bioprocess Engineering:BBE
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• 제9권4호
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• pp.326-329
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• 2004

Corynebacterium acetoacidophilum RYU3161 was cultivated in a L-histidine-limited fed-batch culture. To investigate the effect of cell growth on the L-proline production, 5 L fed-batch culture was performed using an exponential feeding rate to obtain the specific growth rates $(\mu)$ of 0.04, 0.06, 0.08, and 0.1 $h_1$. The results show that the highest production of L-proline was obtained at $\mu$ = 0.04 $h_1$. The specific L-proline production rate $(Q_p)$ increased pro-portionally as a function of the specific growth rate, but decreased after it revealed the maxi-mum value at $\mu$ = 0.08 $h_1$. Thus, the highest productivity of L-proline was 1.66 g $L^-^1 h^-^1$ at $\mu$ = 0.08 $h_1$. The results show that the production of L-proline in C. acetoacidophilum RYU3161 has mixed growth-associated characteristics.