• 한국유기농업학회지
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• 제26권3호
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• pp.489-500
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• 2018

AFACI 회원국 4개국의 수도작 포장의 멸구류 발생 양상을 조사하기 위해서 황색 점착트랩을 이용하여 타락법으로 멸구류 발생 모니터링을 수행하였다. 전반적으로 모든 조사 지점에서 벼멸구의 발생량이 많았으며 상대적으로 흰등멸구의 발생량은 적은 편이었다. 애멸구의 발생은 없었다. 분얼기부터 호숙기까지 벼 멸구류의 발생량은 지속적으로 증가하였으며, 한국의 경우와 다르게 1~2회의 발생 최성기(Peak)가 나타나지 않았다 벼멸구의 경우 모든 조사 지점에서 발생하였으며 스리랑카의 Svay Reang에서 조사기간 동안 평균 1,673마리로 가장 많이 발생하였으며 방글라데시의 Dobila, Hamkuria, 남베트남의 Cho Gao가 각각 1,236마리, 818마리, 666마리 순이었다. 흰등멸구의 경우 조사지점 간 편차가 크게 나타났는데 방글라데시의 Dobila에서는 조사기간 동안 평균 1,163마리가 발생하였으나 남베트남에서는 거의 발생하지 않았다.

• 천문학회지
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• 제48권5호
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• pp.229-236
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• 2015

We report results of investigation of amplitude calibration for very long baseline interferometry (VLBI) observations with Korean VLBI Network (KVN). Amplitude correction factors are estimated based on comparison of KVN observations at 22 GHz correlated by Daejeon hardware correlator and DiFX software correlator in Korea Astronomy and Space Science Institute (KASI) with Very Long Baseline Array (VLBA) observations at 22 GHz by DiFX software correlator in National Radio Astronomy Observatory (NRAO). We used the observations for compact radio sources, 3C 454.3, NRAO 512, OJ 287, BL Lac, 3C 279, 1633+382, and 1510–089, which are almost unresolved for baselines in a range of 350-477 km. Visibility data of the sources obtained with similar baselines at KVN and VLBA are selected, fringe-fitted, calibrated, and compared for their amplitudes. We find that visibility amplitudes of KVN observations should be corrected by factors of 1.10 and 1.35 when correlated by DiFX and Daejeon correlators, respectively. These correction factors are attributed to the combination of two steps of 2-bit quantization in KVN observing systems and characteristics of Daejeon correlator.

• 천문학회보
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• 제35권1호
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• pp.46.2-46.2
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• 2010

APT(Asian-Pacific Telecommunity)는 아시아-태평양지역 국가의 공동이익을 도모하기 위하여 결성된 아-태지역 전파협의체 조직으로, WRC(세계전파통신회의)회의에서의 아-태지역 주관청의 공동이익을 얻기 위해 APG(APT Conference Preparatory Group for WRC)회의를 연간 1회의 비율로 개최하고 있다. WRC-12회의에 대비하여 결성된 APG-12 회의가 2010년 3월 태국 방콕에서 개최되었으며, 전파천문업무 보호 및 22 GHz 대역 달탐사, 38 GHz 대역 Space-VLBI운용대역과 관련된 WRC-11 의제 1.6, 1.11, 1.12 등에 대해 활발한 토론이 있었다. WRC-12 의제 1.11은 22.55-23.15GHz 대역을 달탐사의 관측자료 전송, 명령 및 제어링크 등을 위한 우주연구업무(지구대우주) 용도로 분배 검토하기 위한 의제이다. 따라서 한국천문연구원에서는 국가정책의 일환으로 추진되는 달탐사계획의 향후 원활한 자료전송, 자세링크, 명령을 원활히 수행하기 위해, WRC회의에서 최종적인 규정개정을 함에 있어서 필요한 아-태지역 국가의 공동의견을 창출하기 위한 APT회의에서 주도적인 역할을 담당하고 있다. 본 발표에서는 APG-12 3차 회의에 제출한 우리나라의 기고서 제출 결과 및 동 회의에서의 최종결과 및 향후 대응책에 대해서도 알아보고자 한다.

• 천문학회보
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• 제35권1호
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• pp.47-47
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• 2010

APT(Asian-Pacific Telecommunity)는 아시아-태평양지역 국가의 공동이익을 도모하기 위하여 결성된 아-태지역 전파협의체 조직으로, WRC(세계전파통신회의)회의에서의 아-태지역 주관청의 공동이익을 얻기 위해 APG(APT Conference Preparatory Group for WRC)회의를 연간 1회의 비율로 개최하고 있다. WRC-12회의에 대비하여 결성된 APG-12 회의가 2010년 3월 태국 방콕에서 개최되었으며, 전파천문업무 보호 및 22 GHz 대역 달탐사, 38 GHz 대역 Space-VLBI운용대역과 관련된 WRC-11 의제 1.6, 1.11, 1.12 등에 대해 활발한 토론이 있었다. WRC-12 의제 1.12는 항공이동국이 ASTRO-G와 같은 차세대 space-VLBI의 우주연구업무에 유해한 간섭을 줄 수 있으므로, 항공이동업무의 간섭으로부터 37-38GHz대역의 우주연구업무를 보호하기 위한 연구의제이다. 따라서 한국천문연구원에서는 KVN과 일본국립천문대(ASTRO-G)간의 원활한 국제 공동VLBI연구를 위해, WRC회의에서 최종적인 규정개정을 함에 있어서 필요한 아-태지역 국가의 공동의견을 창출하기 위한 APT회의에서 주도적인 역할을 담당하고 있다. 본 발표에서는 APG-12 3차 회의에 제출한 우리나라의 기고서 제출 결과 및 동 회의에서의 최종결과 및 향후 대응책에 대해서도 알아보고자 한다.

• Natural Product Sciences
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• 제17권2호
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• pp.117-122
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• 2011

We investigated the effect of Orostachys japonicus extracts on serum lipids, leptin and insulin level in hyperlipidemic rats. Also, diacylglycerol acyltransferase (DGAT) activity and thiobarbituric acid reactive substance (TBARS) were assessed. Inhibitory effect of DGAT related to triglyceride synthesis emerged approximately 96% in EtOAc fraction and showed 90% and 67%, respectively, in CHCl3 and BuOH fractions. Furthermore, the EtOAc and BuOH fractions inhibited 81% and 77%, respectively, in glycerol-3-phosphate acyl transferase (GPAT). Hyperlipidemia and obesity marker, contents of leptin and insulin on serum of hyperlipidemic rats, decreased 50% and 25%, respectively, compared with control group in treated EtOAc fraction. The oxidative stress marker, a concentration of TBARS, showed decrease of approximately 30% in treated EtOAc fraction. Moreover, high density lipoprotein (HDL)-cholesterol contents on serum of rats fed a hyperlipidemic diet were increased 10% and low density lipoprotein (LDL)-cholesterol decreased 50% as well as triglyceride amount of feces multiplied approximately two times more than control group in treated EtOAc fraction. The data suggest that the fractions of O. japonicus may be a potent biomaterial for treatment of hyperlipidemia or obesity.

• 한국분말재료학회지
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• 제21권3호
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• pp.215-221
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• 2014

Translucent alumina is a potential candidate for high temperature application as a replacement of the glass or polymer. Recently, due to the increasing demand of high power light emitting diode (LED), there is a growing interest in the translucent alumina. Since the translucent property is very sensitive to the internal defect, such as voids inside or abnormal grain growth of sintered alumina, it is important to fabricate the defect-free product through the fabrication process. Powder injection molding (PIM) has been commonly applied for the fabrication of complex shaped products. Among the many parameters of PIM, the flowability of powder/binder mixture becomes more significant especially for the shape of the cavity with thin thickness. Two different positions of the gate were applied during PIM using the disc type of die. The binder was removed by solvent extraction method and the brown compact was sintered at $1750^{\circ}C$ for 3 hours in a vacuum. The flowability was also simulated using moldflow (MPI 6.0) with two different types of gate. The effect of the flowability of powder/binder mixture on the microstructure of the sintered specimen was studied with the analysis of the simulation result.

• 한국환경생태학회지
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• 제29권4호
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• pp.525-532
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• 2015

두꺼비(Bufo gargarizans)의 정소주기를 파악하기 위해 2012년 3월부터 2013년 2월까지 전라북도 정읍시 일대에서 채집한 수컷 성체를 대상으로 gonadosomatic index(GSI) 및 정소 내 생식세포의 변화를 연중 조사하였다. 세정관 내 정자형성은 4월부터 시작되어져 7월에 가장 활발하게 진행되었으며 이 시기에 GSI 값이 가장 컸고 세정관 단면적도 가장 넓게 나타났다. 2월부터는 정자배출 후 단계의 세정관이 출현하기 시작하여 3월에 가장 많이 존재하였고 이 시기에 제1 정원세포가 나타났으며 GSI와 세정관 단면적도 최저치를 나타내어 정자형성은 GSI 및 세정관 변화와 일치하는 잠재적 연속형으로 진행되었다. 본 결과들로 보아 두꺼비 수컷의 정소주기 중 정자형성은 4월부터 7월에 활발하게 진행되며 번식기는 2월에서 3월로 확인되었다.

• Journal of Ginseng Research
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• 제34권3호
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• pp.205-211
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• 2010

Korean red ginseng (KRG) has been used worldwide as a traditional medicine for the treatment of various diseases, including cancer. In this study, we determined the effect of KRG on the responses of HaCaT cells to peroxynitrite ($ONOO^-$). Cells has been used worldwide as a traditional medicine for the treatment of various diseases, including cancer. In this study, we determined the effect of KRG on the responses of HaCaT cells to peroxynitrite ($ONOO^-$). Cells treated with $ONOO^-$ (2 mM) prior to incubation with control medium for 12 hours displayed reduced viability, as determined using the 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide assay (viability about 48% of that of non-treated control cells). When KRG was added to the post-incubation medium, the negative effects of $ONOO^-$ on cell viability were significantly reduced. Reverse transcription-polymerase chain reaction analysis indicated that KRG alone did not significantly alter p53 or "growth arrest and DNA damage" (GADD)45 mRNA levels. However, the addition of KRG to the post-incubation medium significantly and dose-dependently reduced levels of p53 and GADD45 mRNA in $ONOO^-$-treated cells. Western blot analyses revealed that incubation with KRG decreased p53 and GADD45 protein levels in $ONOO^-$-treated cells, relative to those in cells incubated with control medium. Collectively, these results suggest that Korean red ginseng extract protects cells against $ONOO^-$-induced genotoxicity by increasing cell viability through modulating the expression of p53 signaling intermediates.

• Radiation Oncology Journal
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• 제7권2호
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• pp.227-233
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• 1989

From April 1986 to Dec 1988, fifty one patients with carcinoma of lung were treated by radiation therapy in Department of Therapeutic Radiology, Yeungnam University Hospital Of the 51 patients, $31(61\%)$ were squamous cell ca, $8(15.7\%)$ were small cell ca, and remained $4(7.9\%)$ were other cell types. Total radiation dose was average $64Gy (60\~75 Gy)$ for group A and 45Gy $(40\~59Gy)$ for group B. The mass regression and the response of airway obstruction to radiation therapy was established on the basis of follow up chest X-ray. The mass regression above $50\%$ of total volume was noted in 23 patients $(74.2\%)$ among 31 patients and the difference between two groups was not seen. In squamous cell ca, however, the mass regression rate (above $50\%$ of total volume) was $83.3\%$ (10/12) in group A compared to $50\%$ (3/6) in group B(p<0.05). The alleviation of airway obstruction was noted as follows. In group A, CR $42.9\%$, PR $35.7\%$, no response $21.4\%$ and in group B, CR $55.6\%,\;PR\;33.3\%$, no response $11.1\%$. But, in squamous cell ca, responsiveness is higher than group B. The study indicates that the importance of higher radiation dose in the management of primary tumor mass and airway obstruction caused by lung cancer especially squamous cell ca. So, meticulous treatment planning and multimodality combination therapy without increasing si.do elect or complication is recommended in management of inoperable bronchogenic carcinoma.

• Journal of Animal Science and Technology
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• 제63권3호
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• pp.640-650
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• 2021

Particulate matter (PM) produced in pig houses may contain microbes which can spread by airborne transmission, and PM and microbes in PM adversely affect human and animal health. To investigate the microbiome in PM from pig houses, nine PM samples were collected in summer 2020 inside and outside of pig houses located in Jangseong-gun, Jeollanam-do Province, Korea, comprising three PM samples from within a nursery pig house (I-NPH), three samples from within a finishing pig house (I-FPH), and three samples from outside of the pig houses (O-PH). Microbiomes were analyzed using 16S rRNA gene amplicon sequencing. Firmicutes was the most dominant phylum and accounted for 64.8%-97.5% of total sequences in all the samples, followed by Proteobacteria (1.4%-21.8%) and Bacteroidetes (0.3%-13.7%). In total, 31 genera were represented by > 0.3% of all sequences, and only Lactobacillus, Turicibacter, and Aerococcus differed significantly among the three PM sample types. All three genera were more abundant in the I-FPH samples than in the O-PH samples. Alpha diversity indices did not differ significantly among the three PM types, and a principal coordinate analysis suggested that overall microbial communities were similar across PM types. The concentration of PM did not significantly differ among the three PM types, and no significant correlation of PM concentration with the abundance of any potential pathogen was observed. The present study demonstrates that microbial composition in PM inside and outside of pig houses is similar, indicating that most microbe-containing PM inside pig houses leaks to the outside from where it, along with microbe-containing PM on the outside, may re-enter the pig houses. Our results may provide useful insights regarding strategies to mitigate potential risk associated with pig farming PM and pathogens in PM.