Investigation of the Microstructure of Laser-Arc Hybrid Welded Boron Steel

Son, Seungwoo,Lee, Young Ho,Choi, Dong-Won,Cho, Kuk-Rae,Shin, Seung Man,Lee, Youngseog,Kang, Seong-Hoon,Lee, Zonghoon Springer-Verlag 2018 JOM Vol.70 No.8

Comparative genomics of canine Lactobacillus reuteri reveals adaptation to a shared environment with humans

Seungwoo Son,오재돈,Sung Ho Lee,Donghyun Shin,Yangseon Kim 한국유전학회 2020 Genes & Genomics Vol.42 No.9

Background Lactobacillus reuteri is a gram-positive, non-motile bacterial species that has been used as a representative microorganism model to describe the ecology and evolution of vertebrate gut symbionts. Objective Because the genetic features and evolutionary strategies of L. reuteri from the gastrointestinal tract of canines remain unknown, we tried to construct draft genome canine L. reuteri and investigate modifed, acquired, or lost genetic features that have facilitated the evolution and adaptation of strains to specifc environmental niches by this study. Methods To examine canine L. reuteri, we sequenced an L. reuteri strain isolated from a dog in Korea. A comparative genomic approach was used to assess genetic diversity and gain insight into the distinguishing features related to diferent hosts based on 27 published genomic sequences. Results The pan-genome of 28 L. reuteri strains contained 7,369 gene families, and the core genome contained 1070 gene families. The ANI tree based on the core genes in the canine L. reuteri strain (C1) was very close to those for three strains (IRT, DSM20016, JCM1112) from humans. Evolutionarily, these four strains formed one clade, which we regarded as C1-clade in this study. We could investigate a total of 32,050 amino acid substitutions among the 28 L. reuteri strain genomes. In this comparison, 283 amino acid substitutions were specifc to strain C1 and four strains in C1-clade shared most of these 283 C1-strain specifc amino acid substitutions, suggesting strongly similar selective pressure. In accessory genes, we could identify 127 C1-clade host-specifc genes and found that several genes were closely related to replication, recombination, and repair. Conclusion This study provides new insights into the adaptation of L. reuteri to the canine intestinal habitat, and suggests that the genome of L. reuteri from canines is closely associated with their living and shared environment with humans.

Optimal Offer Strategies for Energy Storage System Integrated Wind Power Producers in the Day-Ahead Energy and Regulation Markets

Son, Seungwoo,Han, Sini,Roh, Jae Hyung,Lee, Duehee The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.6

We make optimal consecutive offer curves for an energy storage system (ESS) integrated wind power producer (WPP) in the co-optimized day-ahead energy and regulation markets. We build the offer curves by solving multi-stage stochastic optimization (MSSO) problems based on the scenarios of pairs consisting of real-time price and wind power forecasts through the progressive hedging method (PHM). We also use the rolling horizon method (RHM) to build the consecutive offer curves for several hours in chronological order. We test the profitability of the offer curves by using the data sampled from the Iberian Peninsula. We show that the offer curves obtained by solving MSSO problems with the PHM and RHM have a higher profitability than offer curves obtained by solving deterministic problems.

Controllable layer by layer plasma etching for hexagonal Boron Nitride

Seungwoo Son,Hyo Ki Hong,Gyeong Hee Ryu,Hyo Ju Park,Zonghoon Lee 한국표면공학회 2013 한국표면공학회 학술발표회 초록집 Vol.2013 No.11

Optimal Offer Strategies for Energy Storage System Integrated Wind Power Producers in the Day-Ahead Energy and Regulation Markets

Seungwoo Son,Sini Han,Jae Hyung Roh,Duehee Lee 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.6

We make optimal consecutive offer curves for an energy storage system (ESS) integrated wind power producer (WPP) in the co-optimized day-ahead energy and regulation markets. We build the offer curves by solving multi-stage stochastic optimization (MSSO) problems based on the scenarios of pairs consisting of real-time price and wind power forecasts through the progressive hedging method (PHM). We also use the rolling horizon method (RHM) to build the consecutive offer curves for several hours in chronological order. We test the profitability of the offer curves by using the data sampled from the Iberian Peninsula. We show that the offer curves obtained by solving MSSO problems with the PHM and RHM have a higher profitability than offer curves obtained by solving deterministic problems.

Complete genome sequencing and comparative genomic analysis of Lactobacillus acidophilus C5 as a potential canine probiotics

( Seungwoo Son ),( Raham Lee ),( Seung-moon Park ),( Sung Ho Lee ),( Hak-kyo Lee ),( Yangseon Kim ),( Donghyun Shin ) 한국축산학회 2021 한국축산학회지 Vol.63 No.6

Lactobacillus acidophilus is a gram-positive, microaerophilic, and acidophilic bacterial species. L. acidophilus strains in the gastrointestinal tracts of humans and other animals have been profiled, but strains found in the canine gut have not been studied yet. Our study helps in understanding the genetic features of the L. acidophilus C5 strain found in the canine gut, determining its adaptive features evolved to survive in the canine gut environment, and in elucidating its probiotic functions. To examine the canine L. acidophilus C5 genome, we isolated the C5 strain from a Korean dog and sequenced it using PacBio SMRT sequencing technology. A comparative genomic approach was used to assess genetic relationships between C5 and six other strains and study the distinguishing features related to different hosts. We found that most genes in the C5 strain were related to carbohydrate transport and metabolism. The pan-genome of seven L. acidophilus strains contained 2,254 gene families, and the core genome contained 1,726 gene families. The phylogenetic tree of the core genes in the canine L. acidophilus C5 strain was very close to that of two strains (DSM20079 and NCFM) from humans. We identified 30 evolutionarily accelerated genes in the L. acidophilus C5 strain in the ratio of non-synonymous to synonymous substitutions (dN/dS) analysis. Five of these thirty genes were associated with carbohydrate transport and metabolism. This study provides insights into genetic features and adaptations of the L. acidophilus C5 strain to survive the canine intestinal environment. It also suggests that the evolution of the L. acidophilus genome is closely related to the host’s evolutionary adaptation process.

드론을 이용한 환경재난 사후대응 기술 및 연구동향 분석 연구

손승우 ( Seungwoo Son ),윤정호,조지혜,김태현,전형진 한국환경정책평가연구원 2016 한국환경정책평가연구원 기초연구보고서 Vol.2016 No.-

국가에서는 과거부터 발생한 수많은 환경재난에 대한 경험을 토대로 재난에 대응하기 위한 체계를 마련하고 지속적으로 개선하는 등의 노력을 기울이고 있다. 하지만 환경이 급속도로 변함에 따라 기상이변에 따른 자연재난 증가, 사회·문화 갈등과 종교 갈등으로 인한 사회재난 증가 등 다양한 환경재난이 지속적으로 발생하고 있다. 환경재난은 발생 전의 예방 단계부터 발생 후의 대응, 복구 등의 단계까지 각각의 과정이 매우 중요하다고 볼 수 있는데, 특히 환경재난이 발생하면 피해 범위나 규모가 빠르게 커지기 때문에 피해확산을 방지하는 것은 물론 신속한 복구 등의 대응조치도 매우 중요하다. 또한 환경재난으로 인해 발생하는 폐기물은 지하수 오염, 악취, 전염병 등의 2차 환경피해를 발생시키기 때문에 신속한 처리 및 운반이 필요한 실정이다. 최근 드론과 센서 등을 활용하여 환경을 감시하거나 대기 및 수질을 측정하는 등 환경 분야가 과학화·선진화되는 추세이다. 이에, 본 연구는 드론을 활용한 환경재난 지역 모니터링, 수색, 탐지, 인명구조 등에 대한 기술과 연구뿐만 아니라 환경감시를 위한 대기질 및 수질 측정, 모니터링 등에 대한 연구검토, 드론을 이용한 재해폐기물 체적 측정, 환경재난발생 시 사후대응을 위한 드론의 활용방안을 최종 목적으로 제시한다. 본 연구에서는 연구 수행을 위해 국내·외 드론 기술과 선행연구를 조사 및 분석하였다. 특히, 전 세계에서 발생한 재난에서 드론의 활용 사례를 분석하여 환경재난발생 시 드론의 활용방안을 제시하였다. 또한 드론을 이용한 대기 및 수질측정 등과 관련한 보고서, 선행연구 등을 분석하였으며, 드론을 활용하여 3D모델링 후 체적을 산출하여 폐기물에 대한 체적산출 가능성을 검토하였다. 드론을 활용한 환경재난 사후대응 방안은 아래와 같다. 1) 드론을 활용한 환경재난지역 실시간 재난정보 확보 환경재난 시에는 비교적 넓은 범위에서 피해가 발생하기 때문에 사람이 직접 현장을 점검하고 분석하기에는 많은 제약이 따른다. 또한 효율적이고 신속한 재난대응 및 복구를 지휘하고 진행하기 위해서는 재난현장의 정보가 실시간으로 필요하다. 드론을 활용하면 광범위한 현장을 실시간으로 촬영한 사진, 영상 등을 재난 지휘통제소에서 확인이 가능하고 이에 따라 신속한 대응 및 복구계획을 수립할 수 있다. 2) 드론을 활용한 환경재난지역 지도화 드론을 활용한 재난지역 지도화는 그간 실제 재난발생 사례에서 많이 활용된 것을 확인할 수 있다. 재난지역 지도화를 통해 전반적인 재난지역의 양적 피해 추정이 가능하며 이에 따라 복원 및 복구계획을 수립할 수 있다. 또한 재난발생 이전의 기존 현황 정보와 재난발생 후 구축한 재난지역 지도를 비교하고 분석하면 대응 및 복구를 위한 우선지역 선정, 복구방향 수립 등이 가능하다. 3) 드론을 활용한 위험지역 접근 및 인명수색·구조 방사능이나 화학물질이 방출될 경우와 폐기물 잔해로 인해 사람이 직접 접근하여 수색하거나 현황을 분석하기에 어려울 때 드론을 활용하여 간접적인 상황분석 및 탐지가 가능하다. 4) 드론을 활용한 재해폐기물 추정 신속한 폐기물 이동을 위해 드론을 활용하여 폐기물의 양을 신속하게 파악하는 것이 중요하다. 본 연구에서는 흙, 모래 등이 퇴적되어 있는 곳을 대상지로 선정하여 고정익 드론과 지상 LiDAR를 이용하여 체적 산출 및 비교·분석하였다. 그 결과, 드론을 활용한 체적(1만 7,082.05㎥)과 지상 LiDAR를 이용한 체적(1만 6,933.79㎥)에 큰 차이가 없었다. 본 연구에서 살펴본 드론의 활용기술은 환경 감시, 모니터링, 복원 등에 대한 환경계획이나 정책 수립 시 유용하게 활용될 수 있을 것이라 판단되고, 드론기술뿐만 아니라 센서기술의 발달 및 적극적인 활용도 더욱 필요할 것으로 사료된다. Based on past experience of having dealt with countless disasters, the South Korean government is making sustainable efforts to develop systems for better disaster response. However, drastic changes in the environment are causing continued occurrence of and changes in disasters that include natural hazards due to extreme weather events and human-instigated disasters arising from social, cultural and religious disputes. From prevention to response and restoration, every step of dealing with disasters holds its own importance. Since the extent and scope of damage tend to escalate in a rapid pace in the wake of a disaster, appropriate contingency plans are especially critical. Disaster waste and debris are responsible for secondary environmental damages such as groundwater contamination, stench and contagious diseases, which calls for their timely transport and processing. Recently, the field of environmental studies is witnessing scientific advances including the monitoring and measurement of atmosphere and water quality using drone technology or censors. In this regard, this study suggests R&D of drones for disaster area monitoring, search and rescue operations, and reviews studies on using drones for measuring and monitoring air and water quality, measuring the volume of disaster waste and planning post-disaster response methods. To achieve the research objective, the development of drone technology at home and abroad and related previous studies were reviewed and analyzed. In particular, cases of drone application in worldwide disasters were analyzed to propose the use of drones in the wake of disasters. Papers and previous studies on using drones for air and water quality measurement were analyzed. Also, feasibility of using drones for 3D modeling and volume calculation of waste was reviewed. Post-natural disaster response methods using drones are as follows. 1) Real-time collection of disaster information in disaster areas using drones Since natural disasters tend to inflict damages to a relatively sizable extent, there are many limitations for a person to manually check and analyze the disaster-struck region. In order for efficient and speedy response and restoration, real-time information of the disaster site is needed. Drones can take real-time photos and videos of the extensive disaster site, which the disaster command and control center can follow up and set up timely restorative plans accordingly. 2) Mapping of disaster area using drones Drones have actually been frequently used in the process of mapping disaster areas. Through mapping, the quantitative damage on the disaster-struck area can be measured, which can be used as a basis for restoration plans. Also, comparison between pre and post-disaster maps can serve as an effective guidance for future response direction. 3) Access danger areas and carry out search and rescue operations using drones In situations where manual access is difficult due to the release of radioactive and chemical materials or waste remains, drones can provide an indirect way of situation analysis and detection. 4) Measurement of disaster waste using drones For timely transport of waste, it is important to use drones to figure out the waste volume. This study selected a site with soil and sand deposit, calculated the volume and made a comparative analysis using a fixed wing drone and a LiDAR. Results showed that the volume calculated using drone (17082.05㎥) and calculation using the LiDAR (16933.79㎥) did not show a considerable difference. Drone application technology reviewed in this study could serve as a meaningful guidance in setting up plans and policies on environmental surveillance, monitoring and restoration. The importance of technological development and proactive use of censors in addition to drone technology are expected to grow further.

다단계 확률론적 계획법과 점진적 회피 알고리즘을 이용한 에너지저장장치 최적 동작에 관한 연구

손승우(Seungwoo Son),정계명(Kyemyung Jung),김기수(Gi Soo Kim),이두희(Duehee Lee) 대한전기학회 2019 전기학회논문지 Vol.68 No.12

We propose an optimal operation strategy for energy storage system (ESS) owners in the virtual hour-ahead (HA) electricity market by solving the multi-stage stochastic optimization (MSSO) model, which can find the most profitable decisions for step-wise operations while considering uncertain situations. For example, the owners can maximize their profits by charging the ESS when the electricity price is low and discharging the ESS when the electricity price is high in response to fluctuating hourly electricity prices. In this process, the ESS requires step-wise decisions since the current decision on the ESS depends on the current charged energy, which also depends on previous decisions. The MSSO model can determine the optimal step-wise decisions by considering subsequent ESS operations based on many possible future electricity price scenarios. Simultaneously, a progressive hedging algorithm (PHA) is proposed to quickly and efficiently solve the problem of the MSSO model with many scenarios by decomposing the problem into subproblems for each scenario and solving subproblems in parallel. Finally, we verify that the four-stage stochastic optimization model results in higher profits in the HA electricity market than deterministic multi-stage and two-stage stochastic optimization models.

28㎚ 공정에서의 향상된 스택 구조 전류 거울 분석

손승우(Seungwoo Son),한재덕(Jaeduk Han) 대한전자공학회 2022 대한전자공학회 학술대회 Vol.2022 No.6

자바를 이용한 클라이언트 / 서버 분산 응용 개발 도구의 설계

손승우(Seungwoo Son),최귀자(Gui-Ja Choe),김창갑(Chang-Kap Kim) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.1A

클라이언트/서버 환경에서의 응용 개발은 주로 윈도우 기반의 GUI로 작성된 클라이언트 프로그램과 DBMS의 데이터를 접근하는 서버 프로그램의 개발로 구성된다. 이러한 클라이언트/서버 응용 개발은 사용의 용이함과 RAD를 지원하는 전용의 개발 도구를 사용하여 개발하였다. 그러나 기존의 개발 도구들은 도구마다 서로 다른 접근 방법을 가지며 RAD 도구들의 폐쇄성을 가지고 있으므로 쉽게 확장하기 어렵고 도구에 종속되기 쉽다. 특히 DBMS를 이용하여 프로그램을 작성할 경우 RAD 도구에 더욱더 종속되게 된다. 최근 많이 사용되고 있는 객체 지향 언어인 자바(Java)는 순수 객체 지향 언어로서 프로그램의 개발 및 실행 환경에 독립적으로 응용을 개발할 수 있다. 본 논문에서는 자바 기반의 DB 응용을 개발할 수 있는 개발 도구의 기본 구조를 제시한다. 본 논문에서 제시하는 도구의 구조는 자바 언어와 자바빈즈를 이용하여 JDBC를 통하여 C/S 환경에 적합한 DB 응용을 개발할 수 있다.