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GIS-Based Research on Location and Spatial Characteristics of the Slum in Daejeon
Dongseon Kim,Seonhee Mo 한국콘텐츠학회 2020 International Journal of Contents Vol.16 No.2
This study performed GIS and statistical analyses on the location and spatial characteristics of the slum in Daejeon. Spatial data of 648 slum residents in Daejeon were collected and 131 residents among them were surveyed. The results showed the trends of higher rent, lower social exclusion and closer neighboring relations in slum center than the surrounding areas, which could be interpreted as the interrelated multilateral effects of the micro- (housing), meso- (relations), exo- (community) and macro- (government policy) systems. The strong bonds among neighbors and various supports from social service facilities elevated the slum area’s rent and diminished residents’ social exclusion more than housing conditions (for instance, poor hygiene and low safety). Slum tenants willingly paid a premium for their substandard housings and refused moving to governmentally provided modern housing units. In urban development, administrative authorities need to be cautious about slum uprooting. Much rather an alternative renewal approach is needed which protects the slum’s intimate relations while improving its overall living standards.
Evaluation of in vivo biodistribution using fluorescent probe labeled microplastic
Dongseon Kim,Hee-Kyung Kim,Dongkyu Kim,Tae-Jun Kwon,Chang-Hoon Shin,Kyungrim Yi,Jong-Wook Lee,Young-Eun Lee,Kil-Soo Kim 한국실험동물학회 2021 한국실험동물학회 학술발표대회 논문집 Vol.2021 No.7
Recent studies have shown that microplastics contaminate our food chain and accumulate in the intestines, liver, kidney, muscles, and more. Among them, polyethylene (PE) accounts for a large proportion of microplastics found in domestic fish and shellfish. It is necessary to study for the organs where the plastics were accumulated, and whether it affects the organism by inducing various responses such as oxidative stress. Therefore, form a part of this purpose, the study is performed to observe and evaluate the microplastic accumulation in organs by in vivo fluorescence imaging. We investigated the biodistribution analysis of microplastic particles by using PEs to classify two particle sizes (5μm, 50μm). For fluorescence imaging, PEs were labeled with cyanine5.5 carboxylic acid (Cy5.5), a near-infrared fluorescent dye. The labeled PEs were characterized by DLS, TGA/DSC, and in vitro IVIS spectrum CT (Perkin elmer, USA). To in vivo biodistribution imaging, each of labeled PEs was administered to ICR mice (n=5) as tracking markers, and the images were obtained by using IVIS spectrum CT (excitation 675 nm/emission 720 nm) at each time points. Mean fluorescence intensity graphs were analyzed by region of interests (ROI) that showed the Cy5.5 labeled PEs were gradually released through the stomach over 24 h after administration. In addition to in vivo imaging and ex vivo imaging were also performed after 24 h imaging, and the fluorescence of each organs were observed. However, there was no difference in organ distribution or secretion depending on the size of microplastics and the sex of mice. In this study, the in vivo biodistribution of the Cy5.5 labeled PEs were realized by fluorescent imaging using signal intensity profiles. In future studies, various microplastics and fluorescent probes would be utilized for comparison purpose.
Water Quality Assessment at Jinhae Bay and Gwangyang Bay, South Korea
Kim, Dongseon,Baek, Seung Ho,Yoon, Dong-Young,Kim, Kyung-Hee,Jeong, Jin-Hyun,Jang, Pung-Guk,Kim, Young-Ok 한국해양학회 2014 Ocean science journal Vol.49 No.3
A new water quality index for evaluating the water quality of Jinhae Bay and Gwangyang Bay was developed. Four water quality parameters were selected as water quality indicators for the water quality index: dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP), chlorophyll-a (Chl-a), and dissolved oxygen (DO). Reference levels of DIN, DIP, and Chl-a were determined as $6.22{\mu}mol\;L^{-1}$, $0.38{\mu}mol\;L^{-1}$, and $2.32{\mu}mol\;L^{-1}$, respectively, on the basis of a long-term dataset that was collected monthly in the Korea Strait over a period of seven years (2006-2012). The water quality index established for Jinhae Bay and Gwangyang Bay is (bottom DO grade ${\times}0.33$) + (surface Chl-a grade ${\times}0.33$) + (surface DIN grade ${\times}0.17$) + (surface DIP grade ${\times}0.17$). On the basis of a three-year observation, the water quality of Jinhae Bay was classified as "good" in winter and spring, "poor" in summer, and "fair" in autumn and exhibited large spatial variation, with the lowest-quality water observed in Masan Bay. The water quality of Gwangyang Bay was classified as "good" in winter, "fair" in spring, "poor" in summer, and "fair" in autumn. Unlike Jinhae Bay, the water quality of Gwangyang Bay exhibited minimal spatial variation. In both bays, water quality among the four seasons was worse during summer. It is essential that a survey for water quality evaluation be conducted during summer.
ON THE ORBIFOLD EULER CHARACTERISTIC OF LOG DEL PEZZO SURFACES OF RANK ONE
Hwang, DongSeon Korean Mathematical Society 2014 대한수학회지 Vol.51 No.4
It is known that the orbifold Euler characteristic $e_{orb}(S)$ of a log del Pezzo surface S of rank one satisfies the inequality $0{\leq}e_{orb}(S){\leq}3$. In this note, we show that the orbifold Euler characteristic of S is strictly positive, i.e., 0 < $e_{orb}(S)$. Moreover, we also show, by construction, the existence of log del Pezzo surfaces of rank one with arbitrarily small orbifold Euler characteristic.