• 천문학회보
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• 제41권2호
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• pp.58.1-58.1
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• 2016

During the year 2016 the newly installed NYSC (National Youth Science Center) 1m optical telescope was officially commissioned. Calls for future observational programmes were announced. During test observations we carried out an observational project aimed at follow-up observations of transiting extrasolar planets. To predict future transits we developed the "TransitSearch" code implemented in Python utilizing transit information from the Open Exoplanet Catalogue. During three nights in April and June 2016 we observed planetary transits of HAT-P-3b and TrES-3b. Preliminary light curves of the transit events are presented alongside with best-fit models. From this experience we plan to improve the optical alignment and photometric performance by operating the 1m NYSC telescope in a strongly out-of-focus mode for transit observations.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제19권3호
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• pp.273-279
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• 2012

In this paper, we construct an extension ($kX$, $k_X$) of a space X such that $kX$ is a weakly Lindel$\ddot{o}$ff space and for any continuous map $f:X{\rightarrow}Y$, there is a continuous map $g:kX{\rightarrow}kY$ such that $g|x=f$. Moreover, we show that ${\upsilon}X$ is Lindel$\ddot{o}$ff if and only if $kX={\upsilon}X$ and that for any P'-space X which is weakly Lindel$\ddot{o}$ff, $kX={\upsilon}X$.

• 천문학논총
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• 제22권4호
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• pp.183-187
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• 2007

The detection and measurement of faint features in cometary image is generally troublesome due to the high value of the ratio of the brightness of the nucleus to the tail, the large size and low surface brightness of the coma and tail and the disturbing presence of field stars trails. The image processing is based on background removal by median filtering. Sample results are shown for the case study of comet 73P/Schwassmann-Wachmann 3.

• Nonlinear Functional Analysis and Applications
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• 제27권3호
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• pp.569-585
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• 2022

A brief comparative survey of some generalizations of a metric space with three dimensional metric structures and different forms of the triangle inequality is done along with their topological properties. Then a common fixed point is obtained for reciprocally continuous and compatible self-maps in a G-metric space. Further, a common fixed point theorem is proved for a pair of weakly compatible self-maps on a G-metric space with the common limit range property.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제38권
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• pp.23.1-23.7
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• 2016

Background: The purpose of this retrospective study was to develop a two- and three-dimensional analysis of the airway using cone-beam computed tomography (CBCT) and to determine whether the airway space would be changed in mandibular prognathism after bimaxillary surgery involving maxillary posterior impaction. Methods: Patients requiring orthognathic surgery from 2012 to 2014 were recruited for this study. CBCT scans were obtained at three points: preoperatively (T0), immediate postoperatively (T1), and after 6 months postoperatively (T2). The nasopharynx, oropharynx, and hypopharynx were measured on the CBCT scan for each patient in a repeatable manner. With the midsagittal plane, linear measurements in the middle of each were obtained. For the CBCT, volumetric measurements of each and total airway were obtained. Results: A total of 22 consecutive patients (11 men and 11 women) were included in the present study. The total volume was significantly reduced (p < .001). However, the change of the diameter and volume of the nasopharynx was not statistically significant (p = .160, p = .137, respectively). In the oropharynx, the change of both the diameter and volume showed statistical significance between preoperatively and immediate postoperatively (p < .001, p = .001, respectively) and also preoperatively and after 6 months postoperatively (p = .001, p = .010, respectively). In the hypopharynx, the change of both the diameter and volume showed statistical significance between preoperatively and immediate postoperatively (p = .001, p < .001, respectively) and also preoperatively and after 6 months postoperatively (p = .001, p < .001, respectively). Conclusions: The bimaxillary surgery involving maxillary posterior impaction can reduce the volume of airway in the patients of mandibular prognathism. Although total airway volume was reduced significantly, the changes in the volume and diameter of the nasopharynx were not statistically significant. The maxillary posterior impaction affects on the nasopharyngeal airway minimally.

• 한국미생물·생명공학회지
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• 제32권1호
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• pp.60-66
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• 2004

Paenibacillus polymyxa 유래의 cycloinulooligosaccharide fructanotransferase(CFTase) 유전자(cft)를 Saccharomyces cerevisiae SEY2102 에 발현시키기 위해 대장균과 효모의 shuttle vector인 pYES 2.0(GALI) promoter)에 subcloning하였다. 구축된 pYGCFT(9.9kb) plasmid를 S. cerevisiae SEY2102에 형질전환하였고, uracil이 결핍된 SD 배지에서 선별하였다. 선별된 형질전혼체(S. cerevisiae SEY2102/pYGCFT)는 galactose 첨가에 의해 성공적으로 발현되어 cyclofructan(CF)을 생셩함을 TLC로 확인하였다. 그러나 균체외로의 효소 분비는 이루어지지 않았고 cytoplasm 보다 periplasmic space에 많이 존재하였다. 효소반응 3시간부터 CF가 생성됨을 확인하였고, 최적온도와 pH는 각각 45$^{\circ}C$와 pH 8.0로 나타났으며, pH 10.0에서도 효소활성이 안정적으로 유지되었다. Inulin 기질에 따른 반응산물 분석결과, Jerusalem artichoke와 dahlia tuber로부터 CF가 가장 효과적으로 생성되었다.

• 대한수학회지
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• 제50권5호
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• pp.1105-1127
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• 2013

Let C[0, $t$] denote the function space of real-valued continuous paths on [0, $t$]. Define $X_n\;:\;C[0,t]{\rightarrow}\mathbb{R}^{n+1}$ and $X_{n+1}\;:\;C[0,t]{\rightarrow}\mathbb{R}^{n+2}$ by $X_n(x)=(x(t_0),x(t_1),{\ldots},x(t_n))$ and $X_{n+1}(x)=(x(t_0),x(t_1),{\ldots},x(t_n),x(t_{n+1}))$, respectively, where $0=t_0 <; t_1 <{\ldots} < t_n < t_{n+1}=t$. In the present paper, using simple formulas for the conditional expectations with the conditioning functions $X_n$ and $X_{n+1}$, we evaluate the $L_p(1{\leq}p{\leq}{\infty})$-analytic conditional Fourier-Feynman transforms and the conditional convolution products of the functions, which have the form $fr((v_1,x),{\ldots},(v_r,x)){\int}_{L_2}_{[0,t]}\exp\{i(v,x)\}d{\sigma}(v)$ for $x{\in}C[0,t]$, where $\{v_1,{\ldots},v_r\}$ is an orthonormal subset of $L_2[0,t]$, $f_r{\in}L_p(\mathbb{R}^r)$, and ${\sigma}$ is the complex Borel measure of bounded variation on $L_2[0,t]$. We then investigate the inverse conditional Fourier-Feynman transforms of the function and prove that the analytic conditional Fourier-Feynman transforms of the conditional convolution products for the functions can be expressed by the products of the analytic conditional Fourier-Feynman transform of each function.

• 디지털융복합연구
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• 제11권8호
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• pp.41-52
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• 2013

도시형생활주택은 1~2인 가구의 주거 안정을 목적으로 규정을 완화한 새로운 주거형태의 주택이다. 본 연구에서는 도시형생활주택의 거주 후 평가(POE;Post Occupancy Evaluation)를 비교 실시하고 결과를 토대로 정책적 시사점을 검토하였다. 연구대상지역은 서울의 강남, 강북의 4곳을 선정하여 총 200명을 대상으로 설문조사를 실시하였다. POE분석 결과, 교통문제, 주차공간, 경제성이 문제점으로 나타났다. 강남지역과 강북지역의 차이점은 독립표본 t-test 분석 결과 입지특성, 건물상태, 시공상태, 주택규모, 유지관리, 경제성에서 강남지역이 만족도가 높은 것으로 나타났으며, 지역간 차이는 크지 않게 나타났다. 따라서 도시형생활주택은 지역적 차이는 별반 없으며 도시형생활주택 전체적으로는 공급면적의 상향조정, 주차공간의 확보를 위한 강제조항의 도입, 설계기술의 개선이 실시되어야 한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권1호
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• pp.93-113
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• 2020

According to information theory, non-orthogonal transmission can achieve the multiple-user channel capacity with an onion-peeling like successive interference cancellation (SIC) based detection followed by a capacity approaching channel code. However, in multiple antenna system, due to the unideal characteristic of the SIC detector, the residual interference propagated to the next detection stage will significantly degrade the detection performance of spatial data layers. To overcome this problem, we proposed a modified power-domain non-orthogonal multiple access (P-NOMA) scheme joint designed with space-time coding for multiple input multiple output (MIMO) NOMA system. First, with proper power allocation for each user, inter-user signals can be separated from each other for NOMA detection. Second, a well-designed quasi-orthogonal space-time block code (QO-STBC) was employed to facilitate the SIC-based MIMO detection of spatial data layers within each user. Last, we proposed an optimization algorithm to assign channel coding rates to balance the bit error rate (BER) performance of those spatial data layers for each user. Link-level performance simulation results demonstrate that the proposed time-space-power domain joint transmission scheme performs better than the traditional P-NOMA scheme. Furthermore, the proposed algorithm is of low complexity and easy to implement.

• The Korean Journal of Pain
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• 제6권2호
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• pp.220-223
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• 1993

Administration of local anesthetics or morphine through epidural space has the effect of curbing postoperative increases in endocrine hormone. Other benefits include improving metabolic reaction and eliminating postoperative pain. However, repeated administration of local anesthetics through epidural space causes tachyphylaxis, and the unstable blockade of sensory nerve resulting in insufficient analgesia. Morphine has excellent postoperative analgesic effect, but complications including: itching, nausea, vomiting, urinary retention and respiratory depression may be associated with its administration. Sixty patients that fall into the category of ASA class I and II were randomly selected for the purpose of the experiment. Thirty patients were give 4 mg of morphine and the rest, 4 mg of morphine plus 80 ml of 0.25% bupivacaine administered through epidural space with the Baxter infuser. Analgesic effect was satisfactory in both groups. On the day of operation, the effect was stronger in group I (P<0.05) and on postoperative second day, group II showed better analgesic effect (P < 0.05). Group II had more patients who complained of itching (P < 0.05). Other complications were statistically insignificant. The findings indicate that administration of morphine through epidural space for postoperative pain management is an effective procedure. Baxter infuser was found to be very instrumental in pain control while reducing the chance of complications.