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High-yield Biosynthesis of Protocatechuate Through Fine Tuning of Biosynthetic Pathway
Jinho YEOM,Seung Min YOO 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.4
Protocatechuate (PCA) is promising building block for synthesizing polymer and plastics. It also has pharmaceutical activities. PCA is naturally present in many plants, but it is impractical to directly extract from natural resources due to low yields. Many efforts have been made over the past years to produce PCA from microbial strains (1), but previous studies either create auxotrophic strain or lack a sufficiently diverse and precise regulation gene expression involved in PCA biosynthesis. We demonstrated an efficient production method via precise tuning of gene expression that related to PCA biosynthesis in E. coli. We used qsuB and precisely controlled the expression level using tunable gene regulation system (2). To decrease precursor consumption, the expression levels of aroE and ydiB, involved in shikimate pathway, were modulated by synthetic sRNAs with different strength (3). Furthermore, several gene modules containing enzymes involved in shikimate pathway and expected to increase the intracellular production of PCA were overexpressed.
스마트시티에서 활용 가능한 LoRa기반 화재 대피 경로 안내 시스템
염진호(Jinho Yeom),조성우(Seongwoo Jo),양서린(Seorin Yang),김경백(Kyungbaek Kim) 한국정보과학회 2021 한국정보과학회 학술발표논문집 Vol.2021 No.6
최근 국내에서 스마트시티 조성이 활성화됨에 따라 이에 적합한 LoRa 통신을 중심으로 연구를 진행하였다. 본 논문에서는 현재 사용 중인 수동형 대피체계의 한계를 보완하고자 화재 상황에 따른 방향 지시 서비스를 구현하였다. 저전력 장거리 통신이 가능한 LoRa 모듈을 이용해 통신망을 구축하였다. 화재 발생 시 CSI 카메라 모듈을 이용한 YOLO 객체 탐지와 온습도 센서를 통해 건물 내부의 혼잡도와 상황을 파악한다. 이러한 데이터를 바탕으로 총 대피시간을 단축시킬 수 있는 대피알고리즘에 적용해 최적의 대피 경로를 안내하는 화재 대피 경로 안내 시스템 개발을 제안한다.
건설현장 물체에 맞음 사고 저감을 위한 줄걸이 작업 전문 자격제도 도입에 관한 연구
염춘호 ( Chun Ho Yeom ),이진호 ( Jinho Lee ),박현 ( Hyeon Park ) 한국안전학회(구 한국산업안전학회) 2018 한국안전학회지 Vol.33 No.5
According to ‘The Analysis of Industrial Accidents in 2016’ by Ministry of Employment and Labor, the number of deaths caused by accidents in the construction field is 391, accounting for 47% of 826 industrial fatalities in all industries. The breakdown of the 391 fatalities of the construction industry shows that ‘struck by an object’ accident had 30 fatalities, the 3rd in frequency following falling (235) and crashing (32) accidents. This study aims to explore ways to reduce the ‘struck by an object’ accident with emphasis on safety education and certificate system for rigging and slinging works. This study reviews literature on rigging and slinging works and analyzes ‘struck by an object’ accidents. The rules and regulation on the rigging and slinging works are also reviewed both for Korea and other countries with best practices in construction safety such as Singapore, Japan, U.K., and U.S. The rigging and slinging certificate systems of those countries are also reviewed to find any advantage in the construction safety management. In addition, a pilot rigging and slinging certificate system was executed in one of domestic construction site followed by two surveys: one on the riggers who participated in the pilot operation and the other on general managers in domestic construction sites. Based on the analysis of the ‘struck by an object’ accidents and pilot operation, this study proposes a rigging and slinging certificate system to reduce accidents, enhancing safety condition of construction sites. The certificate system was proposed in a way to accommodate working practice of construction sites. Depending on rigging careers and a crane load capacity, riggers are eligible to apply either basic or master certificate which makes difference in the level of rigging works. The safety condition of rigging and slinging work could be substantially enhanced if workers, managers, supervisors, administrators, and policy makers work together consistently.