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루이스 알베르토 데 쿠엔카의 시에 나타나는 70세대와 80세대적 요소들
남영우 ( Nam¸ Youngwoo ) 한국스페인어문학회 2021 스페인어문학 Vol.- No.100
1. 시작하는 말 2. 루이스 알베르토 데 쿠엔카와 70세대의 문화주의 3. 루이스 알베르토 데 쿠엔카와 80세대의 시 4. 정리하는 말 참고문헌
Youngwoo Nam,Jae Hyub Shin,Yong Shik Chun,Ja Hyun Na,Min Ho Lee,Mun Il Ryoo 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.05
The effects of the transgenic Chinese cabbage (SKCP19 line) with myrosinase gene and Chinese cabbage (SC19 line) without gene introduction on the insect community were evaluated. Sampling was conducted using yellow sticky traps and wing pheromone traps in Anseong and Deokso fields, respectively. The total number of individuals caught by sticky trap was not shown significant differences between transgenic Chinese cabbage and non transgenic Chinese cabbage at Anseong and Deokso fields, respectively (t=0.72; df=46; P>0.05, t=0.38; df=38; P>0.05). Also, There were no significant differences in density of Plutella xylostella population caught by pheromone traps on transgenic and non transgenic cabbage at both fields (t=0.59; df=22; P>0.05, t=0.52; df=18; P>0.05). This study was funded by BioGreen21 project of Rural Department Administration (No. 20080401-034-039).
Graphene p–n–p junctions controlled by local gates made of naturally oxidized thin aluminium films
Nam, Youngwoo,Lindvall, Niclas,Sun, Jie,Park, Yung Woo,Yurgens, August Elsevier 2012 Carbon Vol.50 No.5
<P><B>Abstract</B></P><P>Graphene structures with both top- and bottom-electrostatic gates are studied. The top gate is made of thin aluminium (Al) film deposited directly onto graphene, with no prior dielectric layer in between. Natural oxidation of Al at the interface with graphene results in an insulating barrier proving useful in making top gates to graphene. For electrically disconnected top gate, graphene resistance as a function of the slowly-varying back-gate voltage shows hysteresis which reveals dielectric properties of the barrier. The estimated barrier thickness is only 2nm allowing for very sharp profiles of the electric field in graphene devices. By applying voltages to both back- and top gates, effective p–n–p junctions with sharp interfaces can be created.</P>
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.
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.
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.
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.
Youngwoo Nam,Insoo Son,Dongwon Lee 한국경영정보학회 2011 한국경영정보학회 학술대회논문집 Vol.2011 No.1
In this paper, we explore retweet mechanism by investigating the effect of message characteristics on information diffusion in terms of volume and speed. To this end, we select four main keywords (e.g., ‘무상급식’, ‘나가수’, ‘김연아’, and ‘iPhone’) that have recently been popular on online social media, embrace various social aspects, and represent distinctive message characteristics. Analyzing the frequency and velocity of retweeting for each keyword, we find that more than half of posted messages on Twitter contain personal opinions for the certain keyword, but we also find that when being retweeted, the group of messages related to the certain keyword present distinctive diffusion patters and speed according to message characteristics. The findings in the study not only broaden our theoretical knowledge of information diffusion mechanism over online social media but also provide managerial implications regarding how to strategically utilize online social media for marketing communication with customers.