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NPP-VIIRS야간 위성영상과 국지적 공간 통계를 이용한 시가지 추출 가능성 평가
주뢰 ( Lei Zhu ),조대헌 ( Daeheon Cho ),전창우 ( Changwoo Jeon ),이소영 ( Soyoung Lee ) 한국도시지리학회 2016 한국도시지리학회지 Vol.19 No.3
Built-up area expansion has long been interested in the aspects of urbanization and land use change not only by academic studies on geography, but also by planners to make proper policies. This paper aims to evaluate the feasibility of NPP-VIIRS nighttime light data on built-up area extraction. Spatial statistical methods-local spatial association statistics (local SAS) (Getis and Ord`s G<sub>i</sub>*, Moran`s Ii, and Lee`s S<sub>i</sub>*) were applied to extract built-up area with NPP-VIIRS images. Central Korea including capital region, Gangwon, Chungnam (including Daejeon and Sejong) and Chungbuk was taken as the study area. Results of raw value and square value of nighttime light value(digital number) were both considered and the results and accuracies were evaluated with the reference data. The results show that: 1) in general, results of square value are more consistent with the reference data than those of raw value for both area comparison and classification accuracy in central Korea, especially for G<sub>i</sub>*; 2) for central Korea analysis, results of highly urbanized regions show a higher accuracy than those less urbanized in general, while the square value results of highly urbanized regions have higher accuracies, and raw value results are more accurate for regions with low urbanization level; 3) for subregional analysis, highly urbanized regions also have a higher accuracy, but contrary to the results of central Korea, raw value results have a higher accuracy in highly urbanized region, while square values perform better in less urbanized region for the urban extraction.
Dependence of the mechanical properties of nanohoneycomb structures on porosity
Choi, Dukhyun,Lee, Sangmin,Lee, Changwoo,Lee, Pyungsoo,Lee, Junghyun,Lee, Kunhong,Park, Hyunchul,Hwang, Woonbong IOP 2007 Journal of micromechanics and microengineering Vol.17 No.3
<P>Mechanical properties of nanohoneycomb structures are measured for varying porosity (or pore diameter) of the nanohoneycomb structure. The indentation modulus and hardness in the pore direction (or thickness direction) are obtained from indentation tests using a nano-indenter. The bending modulus of the nanohoneycomb structures in the vertical direction relative to the pore (generally along the beam length) is determined from bending tests in AFM. To determine the bending modulus of the nanohoneycomb structures, the area moment of inertia of the nanohoneycomb structure is determined according to the arrangement of the pores. The indentation moduli and the hardness are found to decrease nonlinearly with increasing porosity. The bending moduli of the nanohoneycomb structures also decrease nonlinearly as a function of porosity over a large range. It is made clear that the elastic modulus of a homogenous material can be controlled by changing the pore diameter.</P>
이언(Eon Lee),강형석(Hyoungseok Kang),이상석(Sangseok Lee),노상도(Sangdo Noh),이창우(KwangMyong lee),이광명(ChangWoo Lee) (사)한국CDE학회 2010 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2010 No.1
Building Information Modeling (BIM) is the virtual representation of the physical and functional characteristics of a facility from inception onward. As such, it serves as a shared information repository for collaboration throughout a facility’s lifecycle. BIM is a new paradigm which can perform a diverse engineering activity such as design, simulation, structure analysis, etc and support a based information model in construction industry. In these days, many construction companies tried to perform a project efficiently by constructing and using BIM and carried out a research related in PMIS(Project Management Information System), etc. But a real case of research focused on 3D modeling object and control and share of engineering information is insufficient. In this research, we suggest an efficient BIM model and information share system based PLM for collaboration based on analyzing and researching a case of constructing BIM when perform construction project.
THE DOMINATION NUMBER OF A TOURNAMENT
Lee, Changwoo The Kangwon-Kyungki Mathematical Society 2001 한국수학논문집 Vol.9 No.1
We find bounds for the domination number of a tournament and investigate the sharpness of these bounds. We also find the domination number of a random tournament.
Lee, Soonje,Lee, Changwoo,Woo, Changsu,Kang, Shin Jung,Shin, Ki Soon Elsevier 2019 Biochemical and biophysical research communication Vol.508 No.4
<P><B>Abstract</B></P> <P>The ventral subiculum (vSub), a representative output structure of the hippocampus, serves as a main limbic region in mediating the brain's response to stress. There are three subtypes of subicular pyramidal neurons based on their firing patterns: regular-spiking (RS), weak-bursting (WB) and strong-bursting (SB) neurons, located differently along proximal–distal axis. Here, we found that chronic social defeat stress (CSDS) in mice increased the population of SB neurons but decreased RS neurons in the proximal vSub. Specific blockers of T-type calcium channels inhibited the burst firings with a concomitant reduction of afterdepolarization, suggesting that T-type calcium channels underlie the burst-spiking activity. Consistently, CSDS increased both T-type calcium currents and expression of Cav3.1 proteins, a subtype of T-type calcium channels, in the proximal vSub. Therefore, we conclude that CSDS-induced enhancement of Cav3.1 expression increased bursting neuronal population in the vSub, which may contribute to stress-related behaviors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Chronic social defeat stress increased the population of burst-spiking neurons in the proximal ventral subiculum. </LI> <LI> Burst firing and afterdepolarization were inhibited by selective T-type calcium channel blockers. </LI> <LI> Chronic social defeat stress increased T-type calcium currents and the expression of Cav3.1 channels. </LI> <LI> Chronic social defeat stress-induced increase of burst-spiking neurons is mediated by Cav3.1 channels. </LI> </UL> </P>
Lee, Changwoo,Lee, Soonje,Woo, Changsu,Kang, Shin Jung,Kim Kwon, Yunhee,Shin, Ki Soon ZOOLOGICAL SOCIETY OF KOREA 2018 ANIMAL CELLS AND SYSTEMS Vol.22 No.3
<P><B>ABSTRACT</B></P><P>The medial habenula (MHb) plays an important role in nicotine-related behaviors, such as aversion and withdrawal. The MHb is composed of distinct subregions with unique neurotransmitter expression and neuronal connectivity. Here, we showed that nicotine and substance P (SP) differentially regulate neuronal excitability in subdivisions of the MHb (ventrolateral division, MHbVL; dorsal division; MHbD and superior division: MHbS). Nicotine remarkably increased spontaneous neuronal firing in the MHbVL and MHbD, but not in the MHbS, which was consistent with different magnitudes of whole-cell inward currents evoked by nicotine in each subdivision. Meanwhile, SP enhanced neuronal excitability in the MHbVL and MHbS. Although the MHbD is composed of SP-expressing neurons, they did not respond to SP. Neurons in the MHbVL increased their firing in response to bath-applied nicotine, which was attenuated by neurokinin receptor antagonists. Furthermore, nicotine addiction and withdrawal attenuated and augmented excitatory SP effects in the MHbVL, respectively. On the whole, we suggest that MHb-involving nicotine-related behaviors might be associated with SP signaling in MHb subdivisions.</P>
Changwoo Lee,Beakyoul Choi,Jinsung Kim,Yongsun Cho,Juyoul Yoo 한국재난정보학회 2016 한국재난정보학회 논문집 Vol.12 No.3
본 연구에서는 화재 해석 프로그램인 FDS와 Pathfinder를 이용하여 협소 거주공간의 사고 재현을 위해 테스트베드의 화재를 시뮬레이션하였다. 해석 결과, 내부 구조 형태가 H형태 인 경우가 피난대피 시간이 285초로 가장 빠르게 나타났다. 또한 실험 조건 중 출입구가 닫히고 스프링클러가 작동하는 경우가 온도의 분포가 가장 낮게 나타났으며, 이는 가시도 와 연기농도에도 큰 영향을 끼치는 것으로 나타났다. In this study, the fire analysis program FDS and Pathfinder was used to analysis a simulated accidental fire of a narrow dwelling space as a test bed. The results showed that the evacuation time of the H form internal building structure was the fastest at 285 seconds. In addition, when the automatic sprinkler system functioned with the entrances closed, the temperature distribution was lower and the visible smoke density was reduced.