공단지역 및 청정지역 식물 잎권의 잎표면세균 및 내산성세균의 분포

안종훈,방숙진,한남정,송왕영,황소영,이인수,박성주 대전대학교 이과대학 기초과학연구소 1997 自然科學 Vol.- No.-

산성강하물의 영향을 받는 대천공단지역과 영향을 받지 않는 청정지역인 대전 계족산 자연휴양림에서 자라는 밤나무(Castanea crenat)의 잎표면에서 서식하는 총세균수, 생존세균수, 종속영양세균수, 내산성세균수를 1996년 8월부터 1997년 8월까지 5회에 걸쳐 조사하였다. 공단지역 잎표면 평균 총세균수, 생존세균수 및 종속영양세균수는 각각 9.9×10^(5) cell/㎠, 1.6×10⁴cell/㎠, 7.1×10³cell/㎠,로서 청정지역에 비하여 각각 1.5배, 2배, 2.6배 정도로 관찰되었다. MPN법으로 측정한 pH 5.6애서의 잎표면 내산성세를수는 공단지역 3.3×10⁴, 청정지역 3.4×10⁴MON/㎠로 거의 같았고, pH 4.0에서의 내산성세균수는 공단지역애서 1.9×10^-(-1)MPN/㎠인 반면 청정지역에서는 전혀 검출되지 않았다. pH 3.0에서의 내산성 잎표면세균수는 공단지역과 청정지역의 잎권 어느 곳에서도 검출되지 않았다. 한편 계절별 잎표면세균수의 분포는 대체로 잎이 나기 시작하여 크기가 가장 작은 5월에 최대를, 그리고 낙엽이 지는 11월에 최소를 나타내었다. 이런 결과는 공단지역의 대기오염물질의 침적이 주변의 식물 잎표면 세균수를 감소시키지는 않으며, 특히 산성강하물의 영향으로 내산성세균수가 증가함을 보여주고 있다. Total, direct viable count, and acid-tolerant epiphytic bacterial population sizes were quantified on leaves of chestnut tree (Castanea crenata S. et Z.) near Taejon Industrial Estate affected by acid precipitation and deposition as well as in the clean natural forest area, Mt. Kyejok, in Taejon city from August 1996 to August 1997. Geometric mean numbers of total, direct viable count, and acid-tolerant epiphytic bacteria were 9.9×10^(5) cell/㎠, 1.6×10^(6)cell/㎠, and 7.1×10³cfu/㎠ respecfvely, being 1.5, 2, and 2.6 times those in the clean area. Acid-to-lerant epiphytic bfcterial numbers at pH 5.6 by MPN method were 3.3×10" in the industrial area, about the same as the number,3.4×104 MPNicni, of the clean area. Acid-tolerant bacterial number at pH 4.0 was 1.9×10^(-1)MPN/㎠ in the industrial area, whereas none was detected in the clean area. Acid-tolerant bacteria at pH 3.0 were not detected at all in the industrial area as well as in the clean area. Epiphytic bacterial population sizes were generally the greatest in May when leaves are emerged and grew but the lowest in November when defoliation occurs. These results showed that air pollutant deposition on leaves did not cause a deuease of epiphytic bacteria at least and acid deposition on leaves did cause an increase of acid-tolerant bacteria.

How Do People Feel about Deepfake Videos of K-Pop Idols?

Soyoung Wang(왕소영),Seongcheol Kim(김성철) 한국통신학회 2022 韓國通信學會論文誌 Vol.47 No.2

Factors influencing Internet search volume of OTT services in Korea

Soyoung Wang,Haewon Lee,Jaeyoung Park,Seongcheol Kim 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2

OTT market in Korea has grown rapidly and is considered the most noticeable smart media services of the 5G network. This study attempts to identify possible factors influencing the Internet search volume of representative OTT services in Korea, including Netflix, Wavve, Tving, and Watcha, by using Naver search data.

Development of Highway Safety Policies by Discriminating Freeway Curve Alignment Features

Soyoung Jung,Kai Wang,Cheol Oh,Jaenam Chang 대한토목학회 2018 KSCE Journal of Civil Engineering Vol.22 No.4

In the Republic of Korea, severe crashes with injuries and fatalities have most frequently occurred in freeway sections withcombinations of horizontal and vertical curves. To address this issue related to geometric complexness, this study quantitativelyverified the adequacy of Korean highway safety policy and identified supplemental strategies required for the freeway sections withhorizontal and vertical curve combinations. Based on in-depth road geometric data, this study combined K-means clustering withbinomial logit regression to identify the effects of contributing factors on cluster-based crash severity levels. Resultantly, six clusterbasedcrash severity estimation models were produced. Single vehicle to roadside protective facility and multivehicle crash typeswere significant to decrease the likelihood of injury crashes for both full- and three cluster-based regression models. Compared withfull data model, driver’s age, action, crash occurrence time, and traffic management related factors were significantly identified inonly single cluster. The resultant findings show that multidirectional highway safety policies are further required for the currentKorean highway safety policy associated with curve alignment features. This study will assist in researchers and field practitioners’decision-making for future cost-effective highway safety policies provision related to freeway sections with geometric complexness.

Nanoscale fluorescence imaging of biological ultrastructure via molecular anchoring and physical expansion

Wang Wei,Chan Yat Ho,Kwon SoYoung,Tandukar Jamuna,Gao Ruixuan 나노기술연구협의회 2022 Nano Convergence Vol.9 No.30

Nanoscale imaging of biological samples can provide rich morphological and mechanistic information about biological functions and dysfunctions at the subcellular and molecular level. Expansion microscopy (ExM) is a recently developed nanoscale fluorescence imaging method that takes advantage of physical enlargement of biological samples. In ExM, preserved cells and tissues are embedded in a swellable hydrogel, to which the molecules and fluorescent tags in the samples are anchored. When the hydrogel swells several-fold, the effective resolution of the sample images can be improved accordingly via physical separation of the retained molecules and fluorescent tags. In this review, we focus on the early conception and development of ExM from a biochemical and materials perspective. We first examine the general workflow as well as the numerous variations of ExM developed to retain and visualize a broad range of biomolecules, such as proteins, nucleic acids, and membranous structures. We then describe a number of inherent challenges facing ExM, including those associated with expansion isotropy and labeling density, as well as the ongoing effort to address these limitations. Finally, we discuss the prospect and possibility of pushing the resolution and accuracy of ExM to the single-molecule scale and beyond.

방사성폐기물 처분장 진화과정에 따라 생성되는 가스의 특성 조사

전소영(Soyoung Jeon),김단우(Danu Kim),오유나(Yuna Oh),이민희(Minhee Lee),왕수균(Sookyun Wang),김선옥(Seonok Kim) 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10

방사성 폐기물 처분장과 그 주변에서 발생되는 가스의 거동 연구는, 지하 처분장을 설계하는 국가를 중심으로 저장용기의 부식에 의해 발생되는 가스 생성 기작을 규명하는 분야에 집중되어왔다. 다만 처분장 내에서 생성된 가스가 핵종의 이동에 어떤 영향을 줄지에 대한 연구는 국외에서 조차 매우 초보적인 단계이다. 사용후핵연료(고준위 방사성 폐기물) 또는 저·중준위 방사성 폐기물 처리장 주변의 가스 이동과 관련하여 대부분의 기존 연구 결과들은 매질 내에서 이상(two-phase) 비혼성 유체(immiscible fluids) 이동 결과와의 유사성을 일부 지니나, 가스상의 지화학반응, 미생물의 대사활동, 처분장의 진화에 따라 형성될 수 있는 콜로이드의 존재 또는 거동 등이 처분장 내 핵종의 거동에 어떠한 영향을 미치는지에 대한 자료를 거의 제시하고 있지 못하다. 본 연구는 처분장 내 다중 방벽 조건에서 가스 이동을 모사한 실내실험의 결과를 활용하여, 처분장 내 가스 이동 개념 모델뿐 아니라(1단계), 가스-핵종 이동 개념 모델을 개발(2-3단계)하는 가스-핵종 이동을 연계하여 처분장의 안전성을 발생 가스의 관점에서 규명하는 것을 목표로 하고 있다. 1차년도에서는 선행 연구들에서 제시된 처분환경 내에서 생성되는 가스의 특성 및 발생 기작을 처분장의 안전성(가스의 외부 유출 이동 가능성)의 관점에서 정리하고, 처분장 내 인공방벽 매질 내에서의 가스 이동을 모사하는 실내 실험을 설계하는 데 있다. 본 연구에서는 선행 연구 결과 들로부터 처분장 진화과정을 통해 처분장 내에서 생성되는 가스들의 특성과 이동을 가능성을 예측하고, 처분장 내 대표적 인공 방벽 매질인 벤토나이트 내부에서 가스의 이동을 모사한 일부 칼럼실험 결과를 제시하였다. 본 칼럼 실험 결과로부터 폐연료저장 용기 부식에 의해 생성된 수소 가스의 인공 방벽 매질인 벤토나이트 매질 내 주입 및 이동 특성을 예측할 수 있으며, 실제 처분 환경(온도, 압력, 지하수질) 조건에서 방벽간 매질 경계부에서 가스의 존재상(phase) 및 이동 개념 모델 시나리오를 설계할 수 있었다.

그래픽 디자이너의 역할 현황 분석 - 국내 실무 디자이너를 중심으로 -

왕가기 ( Jiaqi Wang ),김소영 ( Soyoung Kim ),이지은 ( Jieum Lee ),김희진 ( Heejin Kim ),설백교 ( Baijiao Xue ),문지혜 ( Jihae Mun ),김소연 ( Soyeon Kim ) 한국디자인트렌드학회 2020 한국디자인포럼 Vol.25 No.1

연구배경 과거 조형적 작업에 국한되었던 디자인은 오늘날 사회혁신을 위한 전략적 요소이자 비즈니스 경쟁력으로 제시되고 있다. 디자이너의 역할도 다변화되어 전략가, 혁신가로서의 역할이 강조되고 있다. 따라서 본 연구는 활발하게 논의되고 있는 디자이너의 확장된 역할이 실무에서 어떻게 수행되고 있는지 파악해 보고자 한다. 연구방법 본 연구는 그래픽 디자이너의 역할 현황 분석을 위해 브랜딩, 광고, UX/UI, VMD의 다양한 세부 분야 실무 디자이너와의 인터뷰를 진행하였으며 이를 디자인 프로세스 단계별로 구분하여 분석 및 논의하였다. 연구결과 실무 디자이너는 전형적 그래픽 디자이너의 역할에 한정되어 있었는데, 이는 조직의 구조적 문제와 타분야의 디자인에 대한 고정관념에서 기인된 것으로 나타났다. 또한, 커뮤니케이션 매체의 다변화 및 디자인 툴의 민주화로 인하여 그래픽 디자이너가 더욱 실현 및 전달 단계의 업무에 치중되고 있었다. 결론 디자인 연구와 실무분야에서 강조되고 있는 디자이너의 역할 차이 인식을 바탕으로 향후 공통된 논의를 이끌어 낼 수 있도록 해야 한다. Background Design, which was limited to visualizing and styling work in the past, is now presented as a strategic element for social innovation and business. The role of designer has also diversified, emphasizing the role of strategist and innovator. Therefore, this study aims to analyse how the extended role of designers, which is actively discussed in design research, are being performed in design practice. Methods The interviews were conducted with graphic designers in various sub-fields of branding, advertising, UX/UI, and VMD, in order to understand the role status of graphic designers in the field. Interviews were analyzed and discussed by the phases of the design process. Result Designers were confined to the role of traditional graphic designer and we found that it was due to the structural issue of organization and stereotypes about design from different field. In addition, due to the diversification of communication media and the democratization of design tool the role of graphic designers were more focused on realization and delivery phase. Conclusion Based on the recognition of the designers’emphasized role difference between design research and practice, effort need to be made to draw common discussion.

고형연료의 염소 및 황 분석을 위한 시험방법별 비교

왕희상(Heesang Wang),한소영(Soyoung Han) 한국환경에너지공학회 2022 한국열환경공학회 학술대회지 Vol.2022 No.1

Domestic solid refuse fuels can be manufactured and distributed only when they pass appropriate standards under the current environment certification system. The content of total chlorine and sulfur, one of these standards, not only has a significant impact on the durability and efficiency of the facility, but also might be environmentally problematic. Currently, the proper chlorine content of solid fuels distributed in Korea is regulated to be less than 2.0 wt.% and the sulfur content is less than 0.6 wt.% and only 2.0 wt.% less in the case of tire chip fuel. It is being tested by the domestic certified test method for solid refuse fuel. There are also ASTM D 7359 in the United States and JIS Z 7302 in Japan for analyzing chlorine and sulfur content. In this study, the domestic certified test method for analyzing chlorine and sulfur content, as well as methods guided by ASTM D 7359 and JIS Z 7302 method are reviewed, and the chlorine and sulfur content of solid fuels is compared. Furthermore, in the future, we would like to find an optimized method for the analysis of chlorine and sulfur content by type of solid fuel.

Evaluation of ¹⁸F-FDG PET/CT Parameters for Detection of Lymph Node Metastasis in Cutaneous Melanoma

Cha, Jongtae,Kim, Soyoung,Wang, Jiyoung,Yun, Mijin,Cho, Arthur 대한핵의학회 2018 핵의학 분자영상 Vol.52 No.1

Purpose The purpose of this study was to investigate the value of $^{18}F$-fluorodeoxyglucose positron emission tomography/computed tomography (FDG PET/CT) parameters in the detection of regional lymph node (LN) metastasis in patients with cutaneous melanoma. Methods We evaluated patients with cutaneous melanoma who underwent FDG PET/CT for initial staging or recurrence evaluation. A total of 103 patients were enrolled, and 165 LNs were evaluated. LNs that were confirmed pathologically or by follow-up imaging were included in this study. PET parameters, including maximum standardized uptake value (SUVmax), total lesion glycolysis and tumour-to-liver ratio, were used to determine the presence of metastases, and the results were compared with CT-determined LN metastasis. Receiver operating characteristic (ROC) curve analysis was used to determine the optimal cut-off values of the FDG PET parameters. Results A total of 93 LNs were malignant, and 84 LNs were smaller than 10 mm. In all 165 LNs, an SUVmax of >2.51 showed a sensitivity of 73.1%, a specificity of 88.9%, and an accuracy of 80.0% in detecting metastatic LNs. CT showed a higher specificity (87.3%) and lower accuracy (65.5%). For non-enlarged regional LNs (<10 mm), an SUVmax cut-off value of 1.4 showed the highest negative predictive value (81.3%). For enlarged LNs (${\geq}10mm$), an SUVmax cut-off value of 2.4 showed the highest sensitivity (90.7%) and accuracy (88.9%) in detecting metastatic LNs. Conclusions In patients with cutaneous melanoma, an SUVmax of >2.4 showed a high sensitivity (91%) and accuracy (89%) in detecting metastasis in LNs ${\geq}1cm$, and LNs <1 cm with an SUVmax <1.4 were likely to be benign.

Arresting cancer proliferation by controlling the surface crystallinity of carbon materials without generating reactive oxygen species

Choi, Jungil,Lee, Soyoung,Wang, Wenping,Hahm, Soo-Hyun,Han, Ye Sun,Nam, Tae-Hyun,Kim, Sang-Hyun,Kang, Sang Soo,Khang, Dongwoo Elsevier 2012 Acta Biomaterialia: structure-property-function re Vol.8 No.9