• Wind and Structures
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• 제35권1호
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• pp.21-34
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• 2022

Gust factor is an important parameter for the conversion between peak gust wind and mean wind speed used for the structural design and wind-related hazard mitigation. The gust factor of typhoon wind is observed to show a significant dispersion and some differences with large-scale weather systems, e.g., monsoons and extratropical cyclones. In this study, insitu measurement data captured by 13 meteorological towers during a strong typhoon Morakot are collected to investigate the statistical characteristics, height and wind speed dependency of the gust factor. Onshore off-sea and off-land winds are comparatively studied, respectively to characterize the underlying terrain effects on the gust factor. The theoretical method of peak factor based on Gaussian assumption is then introduced to compare the gust factor profiles observed in this study and given in some building codes and standards. The results show that the probability distributions of gust factor for both off-sea winds and off-land winds can be well described using the generalized extreme value (GEV) distribution model. Compared with the off-land winds, the off-sea gust factors are relatively smaller, and the probability distribution is more leptokurtic with longer tails. With the increase of height, especially for off-sea winds, the probability distributions of gust factor are more peaked and right-tailed. The scatters of gust factor decrease with the mean wind speed and height. AS/NZ's suggestions are nearly parallel with the measured gust factor profiles below 80m, while the fitting curve of off-sea data below 120m is more similar to AIJ, ASCE and EU.

• 융합보안논문지
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• 제20권3호
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• pp.29-37
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• 2020

ID/Password 기반 인증기술은 간편하면서 일정한 보안수준을 제공하기에 대부분의 시스템에서 사용되고 있으나, 이미 무수히 많은 개인정보 노출사고가 있었으며, 무엇보다 한번 노출된 패스워드를 회수하기 어렵다. 이에, 다양한 two-factor 인증기법들이 도입되었으나, 이들은 많은 비용이 필요하며, 무엇보다 사용자의 불편함을 초래하게 된다. 본 논문에서는 기존과 같이 단 한번의 ID/Password 인증과정에서 사용자마다 고유한 Key-Stroke를 동시에 인증하여 비용대비 효과적이면서, 사용자의 불편함을 초래하지 않고, ID/Password 노출 시에도 Key Stroke Dynamics 패턴이 달라 실패하여 높은 보안성을 보장할 수 있는 기술을 제안한다. 본 논문의 제안 모델은 시스템으로 구축하여 효과성을 확인하였다.

• Journal of Microbiology and Biotechnology
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• 제22권4호
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• pp.479-483
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• 2012

The secretory efficiency of recombinant xylanase xynB from yeast Pichia pastoris between the ${\alpha}$-factor preprosequence and a classical mammalian signal peptide derived from bovine ${\beta}$-casein was compared. The results showed that although the bovine ${\beta}$-casein signal peptide could direct high-level secretion of recombinant xylanase, it was relatively less efficient than the ${\alpha}$-factor preprosequence. In contrast, the bovine ${\beta}$-casein signal peptide caused remarkably more recombinant xylanase trapped intracellularly. Real-time RT-PCR analysis indicated that the difference in the secretory level between the two signal sequences was not due to the difference in the transcriptional efficiency.

• 한국경영과학회지
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• 제5권1호
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• pp.31-38
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• 1980

The purpose of this paper is to exhibit existing replacement models and to develop new replacement models for managing equipments in large organizations, private or public. Some of the models in this paper are well known and in use, and some are not. All these models are classified, depending on main factors which play key roles on the models. One group is the models in which the economic factor plays a key role, and the other is those in which both the economic factor and the effectiveness factor play key roles.

• Journal of Microbiology and Biotechnology
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• 제31권1호
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• pp.16-24
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• 2021

Hepatitis B virus (HBV) genome P-encoded protein HBV DNA polymerase (Pol) has long been known as a reverse transcriptase during HBV replication. In this study, we investigated the impact of HBV Pol on host cellular processes, mainly apoptosis, and the underlying mechanisms. We showed a marked reduction in apoptotic rates in the HBV Pol-expressed HepG2 cells compared to controls. Moreover, a series of assays, i.e., yeast two-hybrid, GST pull-down, co-immunoprecipitation, and confocal laser scanning microscopy, identified the host factor eEF1A2 to be associated with HBV Pol. Furthermore, knockdown of eEF1A2 gene by siRNA abrogated the HBV Pol-mediated anti-apoptotic effect with apoptosis induced by endoplasmatic reticulum (ER) stress-inducer thapsigargin (TG), thus suggesting that the host factor eEF1A2 is essential for HBV Pol's anti-apoptosis properties. Our findings have revealed a novel role for HBV Pol in its modulation of apoptosis through integrating with eEF1A2.

• 정보보호학회논문지
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• 제13권4호
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• pp.29-36
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• 2003

본 논문에서, 우리는 이중 요소 인증과 사전 계산(precomputation)을 사용하여 공중 무선랜(Public Wireless LAMs)에서 노트북뿐만 아니라 PDA에도 적용할 수 있는 새로운 이중 요소 인증된 키교환(TAKE) 프로토콜을 제안한다. 이 프로토콜은 상호 인증, 세션키 설정, 사용자 신원 보호, 그리고 실용적인 half forward secrecy를 제공한다. 프로토콜 수행중에 가입자 무선단말에 필요한 연산량은 한번의 대칭키 암호와 다섯번의 해쉬함수 뿐이다.

• Current Optics and Photonics
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• 제4권4호
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• pp.310-316
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• 2020

We propose and experimentally demonstrate an all-optical radio frequency (RF) spectrum broadening system based on time compression. By utilizing the procedure of dispersion compensation values, the frequency domain is broadened by compressing the linear chirp optical pulse which has been multiplexed by the radio frequency. A detailed mathematical description elucidates that the time compression is a very preferred scheme for spectrum broadening. We also report experimental results to prove this method, magnification factor at 2.7, 8 and 11 have been tested with different dispersion values of fiber, the experimental results agree well with the theoretical results. The proposed system is flexible and the magnification factor is determined by the dispersion values, the proposed scheme is a linear system. In addition, the influence of key parameters, for instance optical bandwidth and the sideband suppression ratio (SSR), are discussed. Magnification factor 11 of the proposed system is demonstrated.

• Animal Bioscience
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• 제35권8호
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• pp.1235-1249
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• 2022

Objective: The purpose of this study was to evaluate the protection of glutamate (GLU) against the impairment in intestinal barrier function induced by lipopolysaccharide (LPS) stress in weaned pigs. Methods: Twenty-four weaned pigs were divided into four treatments containing: i) non-challenged control, ii) LPS-challenged control, iii) LPS+1.0% GLU, and iv) LPS+2.0% GLU. On day 28, pigs were treated with LPS or saline. Blood samples were collected at 0, 2, and 4 h post-injection. After blood samples collection at 4 h, all pigs were slaughtered, and spleen, mesenteric lymph nodes, liver and intestinal samples were obtained. Results: Dietary GLU supplementation inhibited the LPS-induced oxidative stress in pigs, as demonstrated by reduced malondialdehyde level and increased glutathione level in jejunum. Diets supplemented with GLU enhanced villus height, villus height/crypt depth and claudin-1 expression, attenuated intestinal histology and ultrastructure impairment induced by LPS. Moreover, GLU supplementation reversed intestinal intraepithelial lymphocyte number decrease and mast cell number increase induced by LPS stress. GLU reduced serum cortisol concentration at 4 h after LPS stress and downregulated the mRNA expression of intestinal corticotropin-releasing factor signal (corticotrophin-releasing factor [CRF], CRF receptor 1 [CRFR1], glucocorticoid receptor, tryptase, nerve growth factor, tyrosine kinase receptor A), and prevented mast cell activation. GLU upregulated the mRNA expression of intestinal transforming growth factor β. Conclusion: These findings indicate that GLU attenuates LPS-induced intestinal mucosal barrier injury, which is associated with modulating CRF signaling pathway.

• 인지과학
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• 제13권1호
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• pp.1-11
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• 2002

본 논문에서는 먼저 Anchor Text의 단어들이 키워드로 적합한지 TFIDF를 이용하여 테스트하였다. 그 결과는 가중치가 높아서 키워드로 적합한 단어가 있었는가 하면. 아예 문서에 나오지도 않는 단어가 있어 키워드로 적합하지 않은 단어도 있었다. 이를 해결하기 위하여 새로운 키워드 추출 방법을 제시하였다. 본 논문에서는 적합하지 않은 키워드를 제거함으로써 새로운 키워드를 만들어 내고 TFIDF값을 각 키워드의 가중치로 이용하여 Ranking이 가능하게 하였다. 이렇게 추출된 키워드는 기존의 방법보다 정확도가 높아졌음 증명했다.

• 한국중재학회지:중재연구
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• 제15권1호
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• pp.95-112
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• 2005

In the inner turn key constructions the problems of uniform types are repeatedly occurred, and, especially, many problems happen up to the stage of pre-construction(from a bid to a contract) owing to the specialties of the turn key constructions. So the claim factors of the Korean turn key constructions were abstracted in antecedent paper. When the technicians meeting the interior turn key constructions for the first time and working here now are well acquainted with only these factors, many claims will be prevented. By analysing the degree of claims by claims factors through the questionnaires to the experts about the abstracted factors and surveying the amount of the claims through the case studies, what factors exerted how much of influence on the claims was tested and analyzed. Studying and Managing the factors affecting the claims much led the technicians in charge of internal turn key constructions to the prevention and the proper solution of the site claims.