튀니지 조림사업의 SWOT 분석

우수영 ( Suyoung Woo ),김동준 ( Dongjun Kim ) 한국산림경제학회 2018 산림경제연구 Vol.25 No.1

이 논문은 아프리카에 있는 튀니지에서의 조림사업 가능성을 탐색하였다. 튀니지 산림의 대부분은 지중해성 기후이고 저지대인 북부지역에 분포하고 있다. 이 지역의 토양은 비옥하지 않고, 지역에 따라 답압에 의하여 훼손되어 있으나 강수량이 부족한 다른 지역보다 수목의 생육에 적합하다. 또한 이 지역은 도로의 접근성이 좋으며, 선적 항구까지의 거리가 가깝고, 원목이나 부산물을 가공하기 위해 필요한 전력과 용수를 조달할 수 있는 시설이 지역 내에 있어서 원목이나 부산물을 가공하여 수출하는 사업의 여건은 갖추어져 있다. 튀니지에서 산림부산물을 생산하지 않고 원목 생산만을 하는 경우에는 수익성이 낮은 수준이다. 따라서 비목재임산물 중에 지역사회의 중요 소득원이고 수요가 증가하고 있는 코르크를 생산할 수 있는 코르크참나무를 북부 지역에서 식재하고 이 지역에서 생산한 코르크 수피 또는 가공제품을 유럽시장으로 수출하는 사업은 경쟁력이 있다. This study was done to see whether Tunisia is suitable for overseas forestation investment. Most of the forest is distributed in northern area with Mediterranean climate. In the case of producing by-products in this area, the merit is flat topography, good accessibility to road, close distance to shipment port and securement of industrial water and electricity for manufacturing plant. It is competitive to plant cork oak trees in northern area and produce cork bark or products and export them to Europe. Cork is one of the major income sources in Tunisian local community, and the demand is increasing.

Effect of post-annealing on single-walled carbon nanotubes synthesized by arc-discharge

Suyoung Park,Sun-Woo Choi,Changhyun Jin 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.4

In this study, high-purity single-walled carbon nanotubes (SWCNTs) were prepared by removing the unreacted metal constituents and amorphous carbon impurities using a post-annealing process. Unlike conventional thermal processing techniques, this technique involved different gas atmospheres for efficient removal of impurities. A heat treatment was conducted in the presence of chlorine, oxygen, and chlorine + oxygen gases. The nanotubes demonstrated the best characteristics, when the heat treatment was conducted in the presence of a mixture of chlorine and oxygen gases. The scanning electron microscopy, transmission electron microscopy, ultraviolet absorbance, and sheet resistance measurements showed that the heat treatment process efficiently removed the unreacted metal and amorphous carbon impurities from the as-synthesized SWCNTs. The high-purity SWCNTs exhibited improved electrical conductivities. Such high-purity SWCNTs can be used in various carbon composites for improving the sensitivity of gas sensors.

Electrical characteristics of multi-walled carbon nanotube-polyethylene composites by catalyst and gas control

Suyoung Park,Sun-Woo Choi,Changhyun Jin 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.5

In this study, the electrical conductivity of multi-walled carbon nanotubes (MWCNTs) and polyethylene synthesized by an extrusion process was evaluated. The MWCNTs used exhibited differences in their dispersion characteristics depending on the type of catalyst or synthesis gas used. Thus, the choice of catalyst or synthesis gas significantly affect the physicochemical state of the final MWCNTs and MWCNT-based composites. In this investigation, the characteristics of MWCNTs were analyzed in four cases by introducing ethylene and propylene gas to each catalyst synthesized using deposition precipitation and spray drying methods. The MWCNT-based composites synthesized using the catalyst prepared by deposition precipitation and the ethylene synthesis gas showed the best electrical conductivity. In principle, the morphologies of the MWCNTs indicate that the smaller the aggregate size and bundle thickness, the better the electrical conductivity of the MWCNT composites. This implies that the network is well-formed.

Isolation and Characterization of the Colletotrichum acutatum ABC Transporter CaABC1

Kim, Suyoung,Park, Sook-Young,Kim, Hyejeong,Kim, Dongyoung,Lee, Seon-Woo,Kim, Heung Tae,Lee, Jong-Hwan,Choi, Woobong The Korean Society of Plant Pathology 2014 Plant Pathology Journal Vol.30 No.4

Fungi tolerate exposure to various abiotic stresses, including cytotoxic compounds and fungicides, via their ATP-driven efflux pumps belonging to ATP-binding cassette (ABC) transporters. To clarify the molecular basis of interaction between the fungus and various abiotic stresses including fungicides, we constructed a cDNA library from germinated conidia of Colletotrichum acutatum, a major anthracnose pathogen of pepper (Capsicum annum L.). Over 1,000 cDNA clones were sequenced, of which single clone exhibited significant nucleotide sequence homology to ABC transporter genes. We isolated three fosmid clones containing the C. acutatum ABC1 (CaABC1) gene in full-length from genomic DNA library screening. The CaABC1 gene consists of 4,059 bp transcript, predicting a 1,353-aa protein. The gene contains the typical ABC signature and Walker A and B motifs. The 5'-flanking region contains a CAAT motif, a TATA box, and a Kozak region. Phylogenetic and structural analysis suggested that the CaABC1 is a typical ABC transporter gene highly conserved in various fungal species, as well as in Chromista, Metazoans, and Viridiplantae. We also found that CaABC1 was up-regulated during conidiation and a minimal medium condition. Moreover, CaABC1 was induced in iprobenfos, kresoxim-methyl, thiophanate-methyl, and hygromycin B. These results demonstrate that CaABC1 is necessary for conidiation, abiotic stress, and various fungicide resistances. These results will provide the basis for further study on the function of ABC transporter genes in C. acutatum.

OpenNI 를 활용한 승마자의 자세 예측

윤우한(Woo-han Yun),김도형(DoHyung Kim),손형관(Hyungkwan Son),김계경(Kyekyung Kim),강상승(Sangseung Kang),지수영(Suyoung Chi),김재홍(Jaehong Kim) 한국HCI학회 2013 한국HCI학회 학술대회 Vol.2013 No.1

Dispersion of multi-walled carbon nanotubes mechanically milled under different process conditions

Park, Suyoung,Choi, Sun-Woo,Jin, Changhyun Elsevier 2019 Materials chemistry and physics Vol.236 No.-

<P><B>Abstract</B></P> <P>In order to maximize the performances of carbon-nanotube-based composites, it is very important to exactly understand the factors that affect the dispersion of carbon nanotubes. In this study, the milling treatment conditions that resulted in optimal dispersion were determined by analyzing the correlations between important dispersion process factors. In general, as the milling time increased, the diameters, bundle lengths, and bundle diameters of the aggregates decreased. Further, the optimal milling time was 6 h. On the other hand, the bulk density increased with the milling time, indicating that the paste viscosity properties improved gradually. In addition, the electrical conductivities were measured after the extrusion evaluation tests for composites of multi-walled carbon nanotubes and a polymer; 6-h-milled samples provided the lowest surface resistance values, showing the optimum dispersion effect.</P> <P><B>Highlights</B></P> <P> <UL> <LI> MWCNTs were synthesized by two catalytic methods. </LI> <LI> The milling process of MWCNTs was carried out for 3, 6, and 9 h, respectively. </LI> <LI> The optimum dispersion was determined after 6 h milling process. </LI> </UL> </P>

CutMix-SupCon: CutMix 증강과 지도 대조 학습을 활용한 멀티모달 기반 감정인식

김준우(June-Woo Kim),김수영(Suyoung Kim),윤치현(Chihyeon Yoon),황지연(Jiyeon Hwang),정호영(Ho-Young Jung) 한국정보과학회 2023 한국정보과학회 학술발표논문집 Vol.2023 No.6

천리안위성 1·2A호 지표면 알베도 상호 오차 분석 및 비교검증

우종호 ( Jongho Woo ),최성원 ( Sungwon Choi ),진동현 ( Donghyun Jin ),성노훈 ( Noh-hun Seong ),정대성 ( Daeseong Jung ),심수영 ( Suyoung Sim ),변유경 ( Yugyeong Byeon ),전우진 ( Uujin Jeon ),손은하 ( Eunha Sohn ),한경수 ( Kyung-so 대한원격탐사학회 2021 大韓遠隔探査學會誌 Vol.37 No.6

장기간에 걸친 전 지구적인 위성관측 지표면 알베도 자료는 전 지구 기후 및 환경의 변화 감시에 활발히 이용되고 있으며 그 활용도와 중요성이 크다. 우리나라의 경우 정지궤도위성 천리안위성 1호(Communication, Ocean and Meteorological Satellite, COMS) MI(Meteorological Imager) 센서와 천리안위성 2A호(GEO-KOMPSAT-2A, GK-2A) AMI (Advanced Meteorological Imager) 센서의 세대교체를 통해 지속적인 지표면 알베도 산출물의 확보가 가능하다. 그러나 COMS/MI 및 GK-2A/AMI의 지표면 알베도 산출물은 센서 및 알고리즘의 차이로 인해 산출물 간의 차이가 존재한다. 따라서 COMS/MI와 GK-2A/AMI 지표면 알베도 산출 기간을 확장하고 지속적인 기후변화 감시 연계성 확보를 위해 두 위성 산출물 간의 오차 분석이 선행되어야 한다. 본 연구에서는 COMS/MI 및 GK-2A/AMI 지표면 알베도 자료의 중복기간을 대상으로 지상관측자료 AERONET (Aerosol Robotic Network)와 타 위성자료 GLASS (Global Land Surface Satellite)와 함께 비교 분석하였다. 오차 분석 결과 AERONET과의 검증에서 COMS/MI의 평균 제곱근 오차(Root Mean Square Error, RMSE)가 0.043로 GK-2A/AMI의 RMSE인 0.015보다 높게 나타났다. 또한GLASS와 비교하였을 때 COMS/MI의 RMSE는 0.029로GK-2A/AMI의 0.038보다 낮게 나타났다. 이러한 오차특성을 이해하고 COMS/MI 및 GK-2A/AMI의 지표면 알베도 자료를 사용할 때 장기간 기후변화 감시에 적극적으로 활용할 수 있을 것이다. Global satellite observation surface albedo data over a long period of time are actively used to monitor changes in the global climate and environment, and their utilization and importance are great. Through the generational shift of geostationary satellites COMS (Communication, Ocean and Meteorological Satellite)/MI (Meteorological Imager sensor) and GK-2A (GEO-KOMPSAT-2A)/AMI (Advanced Meteorological Imager sensor), it is possible to continuously secure surface albedo outputs. However, the surface albedo outputs of COMS/MI and GK-2A/AMI differ between outputs due to differences in retrieval algorithms. Therefore, in order to expand the retrieval period of the surface albedo of COMS/MI and GK-2A/AMI to secure continuous climate change monitoring linkage, the analysis of the two satellite outputs and errors should be preceded. In this study, error characteristics were analyzed by performing comparative analysis with ground observation data AERONET (Aerosol Robotic Network) and other satellite data GLASS (Global Land Surface Satellite) for the overlapping period of COMS/MI and GK-2A/AMI surface albedo data. As a result of error analysis, it was confirmed that the RMSE of COMS/MI was 0.043, higher than the RMSE of GK-2A/AMI, 0.015. In addition, compared to other satellite (GLASS) data, the RMSE of COMS/MI was 0.029, slightly lower than that of GK-2A/AMI 0.038. When understanding these error characteristics and using COMS/MI and GK-2A/AMI’s surface albedo data, it will be possible to actively utilize them for long-term climate change monitoring.

강우의 시간분포를 이용한 국지성 집중호우의 이동경로 분석

김수영(Kim Suyoung),남우성(Nam Woo-Sung),허준행(Heo Jun-Haeng) 대한토목학회 2004 대한토목학회 학술대회 Vol.2004 No.10

보행 로봇을 위한 에너지 효율적인 구동기 설계

우상영(Sangyoung Woo),신영하(Young-Ha Shin),김민수(Min-Su Kim),최수영(Suyoung Choi),황보제민(Jemin Hwangbo),박해원(Hae-Won Park) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11

Numerous studies have been conducted to replace human labor with legged robots due to their diverse and dynamic motion capabilities. Specifically, the performance of the actuator significantly influences the overall performance of legged robots. Although many legged robots have been developed using various actuation strategies, this paper outlines the design process of the Quasi Direct Drive(QDD) actuator for a quadrupedal robot. The design is rooted in the energy-efficient actuator design principles proposed in prior research. Notably, the paper details a process for reducing mechanical impedance. The dynamic performance of the actuator, as achieved through the presented design process, is verified through jumping experiments using a two-degree-of-freedom one-leg platform. Additionally, energy efficiency is evaluated via comparative experiments involving other platforms.