• 천문학회보
• /
• 제42권2호
• /
• pp.89.1-89.1
• /
• 2017

In this poster, we present standard calibration processes and results for photometry of $H-{\alpha}$ filter using broadband filters. We took data from a night in stable weather condition. And we derived parameters for band pass calibration including color terms. The corrected photometry results from broadband filters like V and R filters showed high correlation enough to replace instrumental $H-{\alpha}$ magnitude. We plan to extend these standardizing processes to another narrowband filters and flux calibration of narrowband filters from photometry of PNe.

• 천문학회보
• /
• 제43권1호
• /
• pp.67.1-67.1
• /
• 2018

We present high-resolution near infrared (IR) spectra of two candidate planetary nebulae (PNe) that were serendipitously found toward the Galactic center (GC). Our spectra obtained using GNIRS on Gemini North reveal strong Br ♑ and He I recombination lines. In one of the targets, we confidently detect Pa ♌ emission. Based on Br ♑ and Pa ♌ lines, we estimate a foreground reddening to be Av=27 mag, which confidently puts this object at the GC distance. Along with the presence of highly excited emission lines such as [S IV], [Ne III], [Ne V], and [O IV] detected in the mid-IR spectra from the Spitzer Space Telescope, and the extended emission in the Pa ♋ narrow-band image from the Hubble Space Telescope, this makes it the first spectroscopically confirmed PN in the GC.

• 설비공학논문집
• /
• 제22권7호
• /
• pp.442-447
• /
• 2010

FPSO (Floating Production Strorage and Offloading) method for LNG industry is efficient and facile compared to onshore NG (Natural Gas) treatment facility. Five simple natural gas liquefaction cycles for FPSO are presented and simulated in this paper. SMR (Single Mixed Refrigerant) cycle, SNE (Single Nitrogen Expander) cycle, DNE (Double Nitrogen Expander) cycle, PNE (Precooled Nitrogen Expander) cycle, and PDNE (Precooled Double Nitrogen Expander) cycle are compared. Simple analysis results in this paper show that precooling process and adding an expander in the liquefaction cycle is an effective way to increase liquefaction efficiency.

• 천문학회보
• /
• 제41권1호
• /
• pp.59.4-60
• /
• 2016

One important aspect of the late stage stellar evolution is the mass loss processes, where a significant amount of stellar material will be returned to the interstellar space to be used for stars of the next generation. Raman scattered O VI and He II by atomic hydrogen in symbiotic stars and young planetary nebulae are found to be excellent tools to investigate the mass loss processes and estimate the mass loss rate. These features appear near hydrogen Balmer emission lines due to the huge cross section in the vicinity of Lyman resonance transitions. With the capability of high spectral resolution and broad spectral coverage, BOES is an ideal instrument to perform Raman spectroscopy of these objects. In this talk, a cursory overview of our research activities on Raman spectroscopy of symbiotics and PNe using the BOES is presented.

• 한국식품조리과학회지
• /
• 제16권1호
• /
• pp.40-46
• /
• 2000

솔잎과 녹차의 물추출물과 에탄올추출물을 액체배지에 0~2%(w/v)첨가하여 5종류의 식중독세균(Listeria monocytogenes, Staphylococcus aureus 196E, Aeromonas hydrophila, Escherichia coli O157:H7, Salmonella typhimurium)을 $10^{5}$~$10^{6}$ cells/ml 되게 접종하여 35$^{\circ}C$에서 24시간 배양하였다. 솔잎과 녹차의 추출물 종류와 농도에 따른 각 식중독세균에 대한 항균활성은 배양액의 생균수 변화를 측정하였으며 이 결과로부터 각 추출물의 최소저해농도와 최소사멸농도를 구하였다. 아울러 솔잎과 녹차의 추출물과 보존료인 sodium benzoate로서 각 세균에 대한 생육저해환의크기를 비교하였다. 솔잎추출물은 Gram 양성균(L. monocytogenes, S. aureus)과 Gram 음성균중 A. hydrophila에 대하여 0.4~l.6% 범위내에서 증식을 억제시켰으며 E. coli와 S. typhimurium은 솔잎추출물에 대하여 강한 내성을 나타내었다. 솔잎 추출물은 시험한 5균주에 대하여 사멸작용은 전혀 나타내지 않았다. 반면에 녹차추출물은 시험한 5균주 모두에 대하여 0.2~l.0% 범위내에서 증식을 억제시켰으며 L. monocytogenes를 제외한 모든 균주를 0.5~2.0% 범위내에서 사멸시키는 강한 항균활성을 나타내었다. 솔잎과 녹차추출물은 특히 S. aureus와 A. hydrophila에 대하여 보존료(sodium benzoate)보다도 강한 항균활성을 나타내었다. 전체적인 항균력의 크기는 녹차 에탄올추출물 > 녹차 물추출물 > 솔잎 에탄올추출물 > 솔잎 물추출물의 순이었다. 이 결과로 미루어 녹차추출물은 다양한 종류의 세균에 대하여 우수한 항균작용을 나타내는 천연 보존료로서의 활용가치가 있을 것으로 판단된다.다.

• 한국식품저장유통학회지
• /
• 제9권2호
• /
• pp.248-252
• /
• 2002

쑥과 솔잎을 각각 물과 70% 에탄올로서 추출하여 전자공여능과 아질산염 소거능을 조사하였다. 쑥 추출물의 전자공여능은 300-1,000ppm 농도에서 물추출물은 50-57%였으며, 에탄올추출물은 51-64%로서 에탄을 추출물이 우수하였다. 솔잎 추출물의 전자공여능은 물추출물은 100-500ppm에서 52-60%, 1,000ppm에서는 70%의 전자공여능을 나타내었으며 에탄을 추출물은 100-500ppm에서 68-71%, 1,000ppm에서는 약 77%로서 물추출물보다 높은 활성을 나타내었다. 아질산염 소거능은 pH 1.2, 3.0, 4.2, 6.0에서 측정한 결과, pH 1.2에서 가장 높았으며 pH 증가에 따라 감소하였다. 쑥추출물 1,000ppm의 아질산염 소거능은 pH 1.2에서 물추출물은 37%, 에탄올추출물은 27%였다. 솔잎 추출물 1,000ppm의 경우에는 pH 1.2에서 물추출물은 65%, 에탄올추출물은53%의 아질산염 소거능을 나타내었다. 추출물의 전자공여능과 아질산염소거능은 솔잎추출물이 쑥추출물에 비하여 우수하였다. 쑥과 솔잎 추출물에서 전자공여능은 에탄을 추출물이 물추출물보다 우수하였으나 아질산염소거능은 물추출물이 에탄을 추출물보다 우수하였다.

• 대한세포병리학회지
• /
• 제6권1호
• /
• pp.62-66
• /
• 1995

Peripheral neuroepithelioma (PNE) of soft tissue is a malignant neuroectodermal tumor arising from peripheral (nonautonomic) nerve. It nay occur in both children and adults, and are highly aggressive neoplasms that rapidly give rise to metastatic disease and death. We exprienced a case of peripheral neuroepithelioma of soft tissue in the upper arm in a 18-year-old female. Cytologic features revealed small round cells with scanty cytoplasm occurring both singly and in clusters. The clusters frequently tended to form Homer-Wright rosettes. The cells had a round to oval nucleus with fine chromatin and inconspicuous nucleoli in a hemorrhagic background.

• 천문학회보
• /
• 제35권2호
• /
• pp.72.2-72.2
• /
• 2010

The extremely metal-poor halo planetary nebula BoBn 1 has been investigated based on IUE archive data, Subaru/HDS spectra, VLT/UVES archive data, and Spitzer/IRS spectra. We have measured a heliocentric radial velocity of $+191.6\pm1.3\;kms^{-1}$ and expansion velocity 2Vexp of $40.5\pm3.3\;kms^{-1}$ from an average over 300 lines. The estimations of C, N, O, and Ne abundances from the optical recombination lines (ORLs) and Kr, Xe, and Ba from the collisional excitation lines (CELs) are also done. We have detected 5 fluorine and several slow neutron capture elements (the s-process). The amounts of [F/H], [Kr/H], and [Xe/H] suggest that BoBn 1 is the most F-rich among F detected PNe and is a heavy s-process element rich PN. The photo-ionization models built with non-LTE theoretical stellar atmospheres indicate that the progenitor was a 1-1.5 $M_\bigstar$ that would evolve into a white dwarf with an $0.62M_{\odot}$ core mass and $0.09M_{\odot}$ ionized nebula. Careful examination implies that BoBn 1 has evolved from a binary and experienced coalescence during the evolution to become a visible PN. The elemental abundances except N could be explained by a binary model composed of $0.75M_{\odot}+1.5M_{\odot}$ stars.

• Journal of Electrical Engineering and Technology
• /
• 제13권5호
• /
• pp.1927-1934
• /
• 2018

In this paper, we studied the state of charge (SOC) estimation algorithm of a high-capacity lithium secondary battery for electric vehicles (EVs) considering temperature characteristics. Nonlinear characteristics of high-capacity lithium secondary batteries are represented by differential equations in the mathematical form and expressed by the state space equation through battery modeling to extract the characteristic parameters of the lithium secondary battery. Charging and discharging equipment were used to perform characteristic tests for the extraction of parameters of lithium secondary batteries at various temperatures. An extended Kalman filter (EKF) algorithm, a state observer, was used to estimate the state of the battery. The battery capacity and internal resistance of the high-capacity lithium secondary battery were investigated through battery modeling. The proposed modeling was applied to the battery pack for EVs to estimate the state of the battery. We confirmed the feasibility of the proposed study by comparing the estimated SOC values and the SOC values from the experiment. The proposed method using the EKF is expected to be highly applicable in estimating the state of the high-capacity rechargeable lithium battery pack for electric vehicles.

• Journal of Chest Surgery
• /
• 제25권7호
• /
• pp.763-768
• /
• 1992

To prevent recurrence of spontaneous pneumothorax, 23 patients were operated through median sternotomy for simultaneous resection of bilateral bullae, And 27 patients with spontaneous pneumothorax were treated with unilateral thoracotomy, We studied the number, duration and sites of recurrence including findings of CT scan, as well as comparing the both operated group. The incidence of spontaneous pneumothorax was 88% in patients with the ages between 16 to 35 Forty one patients[82%] were operated with the indication of recurrent pne-umpthorax. The number of pneumothorax attack was 2.34 per patient with recurrent pneumothorax. The 87.8% of recurrence was occured within 6 months from last attack. Ips-ilateral recurrnet pneumothorax was 56.1% and contallateral involve was 43.9%. The bilaterality of visible bullae was 90.9% in the findings of chest CT scan and 91.3% in the operative finding. The sensitivity and accuracy for bulla detection with chest CT were 92.6%, respectively. Exclude one case of complicated median sternotomy infection, the postoperative hospital stay was shorter in median sternotomy approached group[P<0.05]. In conclusion, the bullous lesions of the lung have tendency of bilaterality so that median sternotomy for simultaneous resection of bilateral bullae should be considered in patients with contralateral visible bullae with chest CT.