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RISS 인기검색어
- 검색키워드
- 저자 : 최재도 (검색결과 145 건)
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This paper develops a methodology of testing linearity using the two stage least squares (2SLS) estimation. It is an extension of the method developed by Baek, Cho, and Phillips (2015) which tests linearity using power transforms of regressors in the standard OLS setting. They derive the linear model from the power transform in three different ways and each of them produces an identification problem, which is called the trifold identification problem. The identification issue is overcome by using the QLR statistic, which we approximate under each identification problem and combine into the composite approximation that contributes to the null limit approximation. This paper shows that the power of QLR statistics dominates that of J-statistics. 본 논문은 도구변수를 사용하는 경우에 선형성을 검증하는 방법을 제시하고 있다. 이는 Baek, Cho, and White (2015)의 방법론을 내생성이 존재하여 도구변수가 요구되는 경우로 확장시킨 것이다. 본 논문 역시 BCP와 마찬가지로 멱변환 (power transform) 모형을 사용하며 션형모형을 검증한다. 이 때 도구변수가 사용되는 경우 역시 trifold identification 이라는 식별문제가 발생함을 보이고 QLR 통계량이 이러한 문제를 해결할 수 있음을 보인다. 시뮬레이션 시행결과 J 통계량보다 QLR 통계량의 검정력이 월등히 높음을 확인할 수 있다.
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橋梁景觀의 形態別 特性 評價 및 視覺的 認知度에 關한 類似性 分析
Recently, the concern of the aspect of esthetic value that the shape of a bridge itself has and the aspect of landscape from harmony with surrounding environment. This is different tendency with before that emphasize the aspect of functional and structural safety. Because a bridge is important structure to determine urban landscape and one of the landmark, so it needs to evaluate bridge's design and bridgescape. The aim of this study is to investigate the present state of the whole country's bridge and to evaluate the visual perception against bridgescape employing semantic differential method through 16 adjectives. And it also analyzes the preference of day and night landscape and the remarkable landmark out of 8 bridges to represent Pusan through Delphi technique, and analyze the similarity on the assessment of bridge's shape, color, light, harmony with the environment which are each bridge's bridgescape composition employing multidimensional scaling method. The major findings of this paper are as follows; First, it is the best factor to determine bridgescape that is the harmony with environment and the shape of bridge. So the result of analysis the evaluation on the visual perception according to the shape of bridge through 16 adjectives, the most unique bridge is arch bridge, the most common bridge is steel box girder bridge, the most familiar bridge is suspension bridge, the most unfamiliar bridge is rigid-frame bridge. Cable-stayed girder bridge give us the most active sense, prestressed concrete slab bridge give us the most static sense. The most rhythmical bridge is rigid-frame bridge, the most monotonous bridge is prestressed concrete slab bridge, and cable-stayed girder bridge give us the strongest impression and the most cheerful feelings. The factor analysis summarize from 16 adjectives to 3 factors. the first factor is commonness which is organized by boring, unbeautiful, unfashionable, monotonous, uninteresting, static, common, simple, depressed, the second factor is disharmony which is composited by reluctant, bad, uneasy, discontinuous, weak, discomfortable, the third factor is unfamiliarity. Second, the bridge which represent Pusan recognized which has the splendid day and night landscape and landmark. Gwangan Bridge is evaluated as chosen the best bridge which has landscape and is the supremacy landmark to represent Pusan. But the result on the assessment for each bridgescape compositions shows interesting findings. Pusan Bridge and Shinho Bridge is bound to the same group as an arch bridge in the bridge's shape aspect and red color which are made of steel in the bridge's color aspect. And Pusan Bridge is similar to Gupo Bridge in the bridge's illumination aspect. The Second Nakdong Bridge and the Third Nakdong Bridge are the lowest grade in all items. Gwangan Bridge is the best bridge and cannot compare with others in the day and night landscape and landmark, as well as bridgescape composition which include bridge's shape, color, illumination and harmony with environment. On the other hand, in spite of Yongdo Bridge's symbol, the assessment shows a bad valuation on the old bridge by a low grade at bridgescape composition
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Inhibition of Hantaan Virus Replication by The Interferon Induced MxA Protein
Human MxA is an IFN-inducible, dynamin-like large GTPase with an antiviral activity against many RNA viruses. Although earlier studies have shown that MxA inhibited Hantaan virus replication, its underlying molecular mechanism has not been fully characterized. In this study, we examined effects of three amino acids substitution mutants of MxA, which had been reported to inhibit other virus replication (or define which cellular function) on Hantaan virus infection of Vero E6 cells. Transiently E645R-expressing cells showed a strong antiviral activity as the wild-type MxA, while T103A and L612K-expressing ones had no or marginal effect. Immuno-fluorescence analyses indicated that the wild-type MxA and E645R prevented the Np from accumulating in the perinuclear area during viral replication. Similar effect was also observed in cells with transiently expressing the N proteins, suggesting a strong correlation between the antiviral activity of MxA and inhibition of the N protein targeting to the perinuclear area. Although no direct physical interaction between Np and MxA was demonstrated in this study, three lines of evidence suggest that MxA may exert an inhibitory effect on the viral replication via the proper targeting of the N proteins (1) Both Np and MxA proteins were targeted to the cellular Rab4-positive endosomes. (2) The transport of these endosomes was blocked by nocodazol, while vesicle fusion was not abolished. (3) NBTI, a vesicle transport inhibitor could effectively prevent the HTNV replication
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대단위 공동주택단지의 빗물저장시설 계획을 통한 주요 도심 주거지 성능분석에 의거 침수재해 저감대책 연구
최재도 창원대학교 일반대학원 2024 국내박사
The purpose of this study is to analyze the rate of increase in flooding in the downstream of the existing downtown area during large-scale urban development in the current situation of increasing flooding in the existing downtown area due to climate change, and to analyze the degree of reduction in flooding in the existing downtown area in the downstream when planning a small excellent storage facility in an apartment complex. The research method used the U.S. Environmental Protection Agency's SWMM model to build a large-scale sewage model and analyze the flooding impact of the downstream existing downtown area through simulation. The built model included the development zone, the existing downtown area in the downstream, and the entire river basin that discharges rainwater. The results of the study were simulated by calculating the minimum excellent storage tank capacity for each apartment block in the study target area during large-scale development activities. It was found that 4,911㎥ for 1 hour, 25,847㎥ for 2 hours, and 55,528㎥ for 3 hours in the downstream existing downtown area could be reduced. The conclusion is that when large-scale flooding simulations are conducted considering the existing downtown areas in the downstream, the flooding in the downtown area in the downstream increases significantly, and if the capacity of the excellent storage tank is planned for each apartment block before development and the construction of the excellent storage tank is recommended by supporting the cost during development, the flood burden in the existing downtown area in the downstream can be reduced.
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