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Youngwoo Nam,Won Il Choi,Hye Jung Song,Kyu Wha Kim 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.10
This study was conducted to examine the occurrence characteristics of pine trees infected by pine wood nematode in Gyeongsangbuk-do, Korea. Based on the GPS coordinate data of the infected trees at Yeongdeok-gun from 2013 to 2014 and at Andong-si in 2014, nearest neighbor analysis was conducted to analyze nearest distance between the infected trees. And the influence of geographical factors such as altitude, slope, and the distance from the road on the position of infected trees were identified. Our results showed that over 60% of the newly infected trees were found within 50m of the trees infected in previous year. Over 70% of infected trees occurred below 100m altitude in Yoeongdeok-gun whereas less 32% of total pine trees distributed below the altitude. 98% of the infected trees and 74% of total pine trees in Andong-si were found between 150 and 300m altitude, and altitudinal distribution of the infected trees was similar to that of pine forests. Only less 5% of infected trees found in the forests located below 5 degree of slope in Yeongdeok-gun whereas 18% of total pine trees existed in the areas. Over 50% of infected trees in the forests located from 10 to 20 degree of slope, and 47% of total pine trees were found in the forests located from 5 to 15 degree of slope. Most infected trees and total pine trees were found in the forests located below 15 degree of slope in Andong-si. Over 80% of the infected trees occurred within 1km of road in both study areas.
Choi, Youngwoo,Lee, Youngsoo,Park, Hae-Sim The Korean Academy of Asthma, Allergy and Clinical 2019 Allergy, Asthma & Immunology Research Vol.11 No.3
<P>Eosinophils have long been recognized as a central effector cell in the lungs of asthmatic patients. They contribute to airway inflammation and remodeling through releasing several molecules such as cytokines, granule proteins, lipid mediators and extracellular traps/vesicles. Repeated evidence reveals that intense eosinophil infiltration in upper and lower airway mucosae contributes to the pathogenesis of aspirin-exacerbated respiratory disease (AERD). Persistent eosinophilia is found to be associated with type 2 immune responses, cysteinyl leukotriene overproduction and eosinophil-epithelium interactions. This review highlights recent findings about key mechanisms of eosinophil activation in the airway inflammation of AERD. In addition, current biologics (targeting type 2 immune responses) were suggested to control eosinophilic inflammation for AERD patients.</P>
Choi, Hyung Jun,Choi, Woocheol,Koh, Youngwoo Elsevier 2018 COMPUTERS & MATHEMATICS WITH APPLICATIONS - Vol.75 No.1
<P><B>Abstract</B></P> <P>In this paper, we study a finite element method overcoming corner singularities for elliptic optimal control problem posed on a polygon. Based on a corner singularity decomposition of singular solution for the associated elliptic system, we derive an extraction formula for coefficients of singular parts, called stress intensity factors, and introduce a finite element discretization for regular parts of the solution pair. Furthermore, we analyze the finite element solutions in <SUP> L 2 </SUP> and <SUP> H 1 </SUP> norms. By numerical experiments, we confirm the efficiency and reliability of the proposed method.</P>
Choi, Jaepil,Kim, Youngwoo,Kang, Junekyung,Choi, Youngjun Architectural Institute of Japan 2014 JOURNAL OF ASIAN ARCHITECTURE AND BUILDING ENGINEE Vol.13 No.3
<P> Though apartments are often criticized for their homogeneous nature, they are being actively adopted as an efficient method of providing houses for developing countries. In this paper, the authors argue whether such phenomenon can be seen simply as cultural identity giving in to internationalism. That is, apartments can indeed reflect locality within their spatial structure. To support this argument, apartment units from Korea, Vietnam, and Kazakhstan, three countries from dramatically different climate zones and cultural backgrounds, are analyzed. In doing so, Space Syntax, a quantitative analysis method widely used to interpret the cultural aspects embedded into a spatial structure is utilized. Each country's apartment units had different functions at the topological center, which should not be seen as a mere coincidence since they were consistent with the spatial characteristic found in their respective traditional houses. Therefore, it can be said that apartments, in their unit plans, do reflect locality, a direct contradiction to the general belief. </P>
Youngwoo Nam,Sang-Hyun Koh,Won Il Choi 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.04
The diurnal flight pattern of Platypus koryoensis (Murayama) was examined using sticky traps attached to the trunks of oak trees in central Korea in 2011. The flight activities of the beetle were estimated on the basis of 2-h interval trap catches from 05:00 to 17:00, between June 9 and July 21 (the peak flight period of the beetle). Peak flight time of the beetle ranged from 09:00 to 13:00, with variations due to the day surveyed and the facing slope. The flights began when the air temperature reached 16.7 °C, and the flights peaked when the air temperature was 23.6 °C. Flights were not observed during rainfall, suggesting that rainfall is one of the factors that influence beetle flight. The time of sunrise was not significantly correlated with the flight initiation time. The direction of flight along with the slope was changed bidirectional to unidirectional (movement from upslope to downslope) between 9:00 and 13:00.
Radio Frequency Based Emergency Exit Node Technology
Choi, Youngwoo,Kim, Dong Kyoo,Kang, Do Wook,Choi, Wan Sik The Institute of Positioning 2013 Journal of Positioning, Navigation, and Timing Vol.2 No.1
This paper introduces an indoor sensor fusion wireless communication device which provides the Location Based Service (LBS) using fire prevention facility. The proposed system can provide information in real time by optimizing the hardware of Wi-Fi technology. The proposed system can be applied to a fire prevention facility (i.e., emergency exit) and provide information such as escape way, emergency exit location, and accident alarm to smart phone users, dedicated terminal holders, or other related organizations including guardians, which makes them respond instantly with lifesaving, emergency mobilization, etc. Also, the proposed system can be used as a composite fire detection sensor node with additional fire and motion detect sensors.
Youngwoo Nam,Won IL Choi,Dae-Sung Won,Jong-Kuk Kim,Sang-Hyun Koh,Jung-Su Lee,Kyung-Hee Kim 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.10
An ambrosia beetle, Platypus koryoensis, is a vector of Raffaelea quercimongolicae that is known to cause Korean Oak Wilt (KOW), one of the serious threats to forest healthy in Korea. To manage P. koryoensis properly, it is necessary to clarify flight period of the adult. This experiment was conducted to elucidate the relationship between temperature and the flight period based on field observation in three forests consisted of Quercus mongolica from 2007 to 2009 except winter season. Date of flight period for 50% (FP50) was estimated by the cumulative Weibull distribution model based on cumulative proportion of the adult density and air temperature. Relationship between site temperature and the date of FP50 of P. koryoensis was the most significant when temperatures below 6.5℃ were excluded, suggesting lower threshold temperature for the flight period based on the site temperature. The pooling cumulative proportion of flight period against degree days was well described by the degree-day model, which has explanatory power for the 89% of year and site variation in the flight period and predicted accurately the flight pattern in 2011.
Choi, Youngwoo,Jung, Jaewon The Kangwon-Kyungki Mathematical Society 2013 한국수학논문집 Vol.21 No.3
By analyzing one-parameter families of totally interpolating multiwavelet systems of minimal total length with low approximation orders, whose explicit formulas were obtained with the aid of well-known relations of filters, we demonstrate the infinitude of such systems.