http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Effects of Transgenic Rice on Life History Traits of Daphnia magna in Life Table Experiments
Nam Sungjin,Dongwoo Yang,김창기,Sangkyu Park 한국생태학회 2007 Journal of Ecology and Environment Vol.30 No.4
To investigate the impacts of transgenic rice on freshwater organisms, we conducted two life table experiments using Daphnia magna for fifteen and twenty days, respectively. We examined life history traits such as population growth rates (r), reproductive rates (R0), generation times, and survivorship. In the first experiment, we used non-drought-stressed transgenic and non-transgenic rice harvested in 2005. In the second study, we used non-transgenic and transgenic rice harvested in 2006 following drought stress. Each experiment involved three treatments in which D. magna neonates were fed with Selenastrum capricornutum (control treatment) and S. capricornutum with 5% aqueous extracts of non-transgenic rice (N-T) and transgenic rice (T). In the first experiment, D. magna showed reduced population growth rates and lowered fecundity in the N-T and T treatments. In the second experiment, D. magna receiving both transgenic and non-transgenic rice extracts showed very high mortality, low population growth rates and reproduction rates. We could not detect any significant negative effects of extracts from transgenic rice on D. magna life history traits at 95%.
Sungjin Nam,Ji Young Jung National Institute of Ecology 2023 국립생태원회보(PNIE) Vol.4 No.2
Climate change is more rapid in the Arctic than elsewhere in the world, and increased precipitation and warming are expected cause changes in biogeochemical processes due to altered microbial communities and activities. It is crucial to investigate microbial responses to climate change to understand changes in carbon and nitrogen dynamics. We investigated the effects of increased temperature and precipitation on microbial biomass and community structure in dry tundra using two depths of soil samples (organic and mineral layers) under four treatments (control, warming, increased precipitation, and warming with increased precipitation) during the growing season (June-September) in Cambridge Bay, Canada (69°N, 105°W). A phospholipid fatty acid (PLFA) analysis method was applied to detect active microorganisms and distinguish major functional groups (e.g., fungi and bacteria) with different roles in organic matter decomposition. The soil layers featured different biomass and community structure; ratios of fungal/bacterial and gram-positive/-negative bacteria were higher in the mineral layer, possibly connected to low substrate quality. Increased temperature and precipitation had no effect in either layer, possibly due to the relatively short treatment period (seven years) or the ecosystem type. Mostly, sampling times did not affect PLFAs in the organic layer, but June mineral soil samples showed higher contents of total PLFAs and PLFA biomarkers for bacteria and fungi than those in other months. Despite the lack of response found in this investigation, long-term monitoring of these communities should be maintained because of the slow response times of vegetation and other parameters in high-Arctic ecosystems.
휠체어를 포함한 장애인 이동 수단 탐지를 위한 Seed 기반 딥러닝 모델 및 성능 평가
황성진(Sungjin Hwang),허지웅(Jiwoong Heo),문주철(Jucheol Moon),김한성(Hansung Kim),차재혁(Jaehyuk Cha),김광욱(Kwanguk (Kenny) Kim) 한국HCI학회 2021 한국HCI학회 학술대회 Vol.2021 No.1
이용자가 현재 타고 있는 이동수단을 탐지하는 기술은 도시 계획, 개선된 위치 표시 등에 활용될 수 있다. 특별히 휠체어 이용자의 경우 이동수단 탐지가 도시계획에 활용할 때, 휠체어 이용자의 이동성과 접근성을 증진시켜 그들의 삶의 질을 향상시킬 수 있다. 최근 연구들에서는 이동수단 탐지를 위해 스마트폰의 위치 및 센서 데이터에 기계 학습 방법을 적용하였고, 그 성능을 파악하기 위해 repeated random sub-sampling validation 방법을 사용하였다. 하지만 이는 새로운 이용자에 대한 이동수단 예측 성능을 나타내는 k-fold user-cross-validation 을 시도할 때 그 성능이 저하될 수 있다. 본 연구에서는 이러한 성능 저하가 휠체어를 포함한 이동수단 탐지에서도 발생하는지 확인하고, 발생시 이를 극복하기 위해 새로운 장애인의 데이터를 소량 추가 학습시키는 k-fold user-cross-validation with individual seed data 라는 방법을 제안하고자 한다. 연구 결과 기존 방법 두 가지와 본 연구에서 제안한 방법, 총 세 가지 방법으로 성능을 평가한 결과 휠체어를 포함한 이동수단 탐지에서도 같은 문제가 발생하며, 제안한 방법을 적용해 기존의 성능을 개선함을 확인할 수 있었다.
Serially Connected Micro Amorphous Silicon Solar Cells for Compact High-Voltage Sources
Nam, Jiyoon,Lee, Youngjoo,Kim, Chang Su,Kim, Hogyoung,Kim, Dong-Ho,Jo, Sungjin Hindawi Limited 2016 Journal of nanomaterials Vol.2016 No.-
<P>We demonstrate a compact amorphous silicon (a-Si) solar module to be used as high-voltage power supply. In comparison with the organic solar module, the main advantages of the a-Si solar module are its compatibility with photolithography techniques and relatively high power conversion efficiency. The open circuit voltage of a-Si solar cells can be easily controlled by serially interconnecting a-Si solar cells. Moreover, the a-Si solar module can be easily patterned by photolithography in any desired shapes with high areal densities. Using the photolithographic technique, we fabricate a compact a-Si solar module with noticeable photovoltaic characteristics as compared with the reported values for high-voltage power supplies.</P>
Sungjin Lee,Yuong-Nam Lee,Jin-Young Park,Su-Hwan Kim,Zorigt Badamkhatan,Damdinsuren Idersaikhan,Khishigjav Tsogtbaatar 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
Troodontids are a very diverse group of theropod dinosaurs characterized by high tooth counts and specialized arctometatarsal feet. Due to their bird-like body plan, the majority of recent phylogenetic studies suggest they are among the most closely related clades to birds. Most of the troodontids are known from the Cretaceous of Asia and North America, and the temporal record of this clade extends back to the Late Jurassic. In the Nemegt Basin of the southern Gobi Desert of Mongolia, seven troodontid genera have been reported from the Djadochta and Nemegt formations. However, the Baruungoyot Formation, which is stratigraphically intermediate between the other two formations in this region, has not produced any troodontids yet. The lack of troodontids in this formation has been confusing because of its rich dinosaur fauna and the similar temporal range among the three major sedimentary deposits in the Nemegt Basin. We examined a partial skeleton (SNU-IPG 201824) unearthed from the Baruungoyot Formation at Hermiin Tsav in 2018. SNU-IPG 201824 consists of hind limb elements, including femora, a tibia, proximal tarsals, a tarsometatarsus, and pedal digits, most of which are from the left side. It is identified as a troodontid based on the following characters: a deep intercondylar groove on the astragalocalcaneum, an asymmetrical metatarsus with an arctometatarsal condition, and a distal articular surface of pedal phalanx II-2 being less than half the size of its proximal articular surface. It is small-sized and lightly built with fragile and delicate compact bones susceptible to wear and breakage, indicating that preservational bias may have played a significant role in the hitherto absence of troodontids from the Baruungoyot Formation. The new specimen thus fills the stratigraphic and possibly temporal gap of troodontids in the Nemegt Basin.
Sungjin Park,Juhyun Nam,Jong-Ku Lee,Sung-Soo Oh,Hee-Tae Kang,Sang-Baek Koh 대한직업환경의학회 2015 대한직업환경의학회지 Vol.27 No.-
Objectives: This study was conducted to investigate the relationship between night work and cardiovascular diseases among wage workers in Korea. Methods: The study was based on the 3rd Korean Working Conditions Survey (KWCS; 2011). This study included 29,711 wage workers. We used the chi-squared test and logistic regression to examine the association between cardiovascular diseases and night work and cumulative night work. Results: Among all of the paid workers, 12.5% reported doing night work ≥ 1 day per month. Night work was significantly associated with an increased risk of cardiovascular diseases (odds ratio [OR] 1.58, 95% confidence interval [CI] 1.11-2.25). Also, compared to the group that did not do night works, the group with higher cumulative night work demonstrated an increased risk for cardiovascular diseases (OR 1.81, 95% CI 1.19-2.74). Conclusions: This study suggests that night work is significantly associated with cardiovascular diseases.