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Youngwoo Nam,Sang-Hyun Koh,Sung-Jae Jeon,Ho-Joong Youn,Young-Seuk Park,Won Il Choi 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.04
This study examined the effects of environmental factors on the abundance of black pine bast scale (BPBS), Matsucoccus thunbergianae Miller and Park, in coastal disaster prevention forest stands composed mostly of Japanese black pine. Geographical factors, soil conditions and forest stand conditions were measured to evaluate the hazard rating for the occurrence of BPBS from 35 plots in the coastal forest stands. To assess the hazard rating, a combination of a self-organizing map (SOM), which classified the samples according to their characteristics, and a random forest model, which predicted the probability of the occurrence of BPBS from SOM results, was used in this study. Our results showed that major factors determining the abundance of BPBS were climate, tree size, and tree health. BPBS was more common in low latitude coastal forests, suggesting that warmer conditions were favorable to BPBS population buildup. Tree size also influenced the abundance of BPBS, which was higher in forests composed of larger trees (greater DBH). Finally, BPBS was also more abundant in areas with high soil salinity and clay-loam soil, and north-facing slopes where tree vigor was lower.
Study on macrolepidoptera diversity using light trap catches in Korea, 2012
Sung-Jae Jeon,Youngwoo Nam,Sang-Hyun Koh,Won il Choi 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.10
The species diversity of macrolepidoptera (larger species of moths) was surveyed using light traps at forests near the Forest Environmental Research Institute located in 9 provinces (Gyeonggi, Gangwon, Chungbuk, Chungnam, Jeonbuk, Jeonnam, Kyeongbuk, Kyeongnam, Jeju) in 2012. Sampling was conducted weekly or biweekly from April to October. Using light traps in 8 forests, 2,961 individuals belong to 530 species from 20 families were collected. The species richness between study sites ranged from 4 (Kyeongnam) to 258 (Chungbuk). Similarly, abundance was the highest at Gyeonggi (1,235 individuals) and lowest at Kyeongnam (11 individuals). Species diversity (H’) was the highest at Chungbuk (5.14) and lowest at Kyeongnam (1.29). Composition of macrolepidopteran species also changed seasonally, showing regional variations. Dominant species in 9 study sites were Lamoria glaucalis in Gyeonggi, Ivela auripes in Gangwon, Idiotephria amelia in Chungbuk, agrotis tokionis in Chungnam, Acosmeryx naga in Jeonbuk, Glyphodes perspectalis in Jeonnam, Spodoptera depravata in Gyeongbuk, Xestia dilatata in Gyeongnam and Lithosia quadra Jeju. Among the species, Ivela auripes, Lamoria glaucalis, and Glyphodes perspectalis were known to be sporadic forest insect pests. Therefore, continuous monitoring can be needed to prevent the potential outbreaks of such insect pests.
( Youngwoo Jang ),( Heekyung Ahn ),( Eunyoung Kim ),( Jungkeun Moon ),( Yangbin Jeon ),( Kyuchan Lee ),( Yeonho Park ),( Eunyoung Cho ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1
Primary cardiac cancer is a very rare disease, as the prevalence is 0.001 to 0.03%. Primary cardiac angiosarcoma is one of the most frequent types of primary cardiac cancers, however, is characterized by extremely poor prognosis, as the mean survival is reported to be only three to four months, and optimal treatment is unknown. Here we report a patient of primary cardiac angiosarcoma with hemorrhagic pericardial effusion who achieved a durable response with tumor excision followed by concurrent chemoradiotherapy with docetaxel. A sixty year old male with underlying history of diabetes mellitus presented with rapidly progressing shortness of breath. Cardiac tamponade was diagnosed, and 420 cc of bloody fiuid was drained with pericardiocentesis. The patient`s blood pressure was restored to within normal limit after pericardial effusion drainage. Subsequent chest computed tomography scan, echocardiography and cardiac Magnetic Resonance Image revealed a 4.5x3.5cm sized infiltrative mass in the right atrium. Tumor excision was performed, of which pathologic findings revealed cardiac angiosarcoma with tumor involvement of resection margin. The patient underwent adjuvant radiotherapy (5000cGys/30fractions) with concurrent chemotherapy with docetaxel. There was no evidence of recurrence until ten months later, when multiple liver metastases were found on CT scan. Hepatic metastasectomy with periop chemotherapy with weekly paclitaxel was followed. As of Jul 2014, the patient is receiving chemotherapy with overall survival of 16 months and counting. Currently there are only three published case reports of cardiac angiosarcoma which showed response to radiation and taxane, and this is the fourth case report of successful treatment. Further investigation on this regimen is warranted.
Proteomic analysis of extracellular vesicles derived from<i>Propionibacterium acnes</i>
Jeon, Jinseong,Mok, Hyuck Jun,Choi, Youngwoo,Park, Seung Cheol,Jo, Hunho,Her, Jin,Han, Jin-Kwan,Kim, Yoon-Keun,Kim, Kwang Pyo,Ban, Changill Wiley (John WileySons) 2017 PROTEOMICS CLINICAL APPLICATIONS Vol.11 No.1
Enhancing PV modules efficiency and output power by applied laser patterned glass
Kim Minje,Jeon Youngwoo,Kim Hong-Il,Park Jinjoo 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.11
The power of a PV module afects the amount of incident light collected by the cells. It causes optical loss in the process of modularizing solar cells. Optical loss in the PV module is refected due to refractive index mismatch at the air/glass interface. To reduce the optical loss, we form periodic patterns using a femtosecond laser, which is a non-thermal process and form various patterns through a chemical etching process. The laser patterned glass having a light-trapping structure with a periodic pattern improved transmittance of 1.59% in the visible ray region (380–780 nm) and haze ratio of 55% at 550 nm. Laser patterned glass was applied to the module, and the power was improved by 1.56% with a current gain of 1.56% due to the light-trapping structure.
Optimization grid design of rear side in bifacial PERC solar cells
Somin Park,Youngwoo Jeon,Hongrae Kim,Minkyu Jang,Donghyun Oh,Junsin Yi,Jinjoo Park 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
Bifacial solar cells are expected in the field of solar cells. we obtained the value of the bifacial- passivated emitter rear contact (bi-PERC) solar cell structure. The front is fixed to 12 BB, BB width of 0.11mm, 100 finger with keeping width of 30 µm. The rear conditions: The number of BB is 12, 16, 20 and 24, the width of the BB is 0.11, 0.13, 0.15, 0.17 and 0.19 mm. And the number of fingers is 80, 90, 100, 110 and 120, the width of the finger is 30, 45 and 60 µm. 24 BB, BB width of 0.11mm, 100 fingers, finger width of 30 µm (pitch 1.57 mm), we got optimal results in 26.48% efficiency.