The evergreen oak tree, Quercus myrsinaefolia Blume, is not only economically important for wood, medicine, landscape trees, etc., but also becoming more important in terms of ecology due to climate change. However, asexual reproduction was difficult, so this study was conducted to establish the optimum conditions for micropropagation by shoot multiplication. The surface sterilized seeds of Q. myrsinaefolia were successfully germinated in WPM basal medium. BAP (1.0 mg/L) treatment was most effective for inducing multiple shoots. The highest induction rates of adventitious roots from the multiple shoots was shown in the treatment of 1.0 mg/L NAA. Both MS and WPM medium were most effective for growth of multiplied plantlets. For ex vitro acclimatization, the survival rates of multiplied plantlets were 100% in vermiculite and commercial soil. The results of this study can be used for proliferation and supply, and establishment of ex situ conservation of Q. myrsinaefolia elite trees.

As part of the research program “2018 Rapid screening and identification of freshwater microorganisms using MALDI-TOF/MS library” freshwater samples were collected from a branch of the Nakdong River. Almost 300 antibiotic-resistant bacterial strains were isolated from freshwater samples and subsequently identified by 16S rRNA gene sequencing. Seventeen strains among the isolates shared high 16S rRNA gene sequence similarity (>99.0%) with known species that were not previously recorded in Korea, and each of the isolates also formed a robust phylogenetic clade with the closest species. These species were phylogenetically diverse, belonging to four phyla, seven classes, 10 orders, and 13 genera. At the genus and class level, the previously unrecorded species belonged to Rhodovarius, Xanthobacter, and Shinella of the class Alphaproteobacteria; Ottowia, Simplicispira, and Zoogloea of Betaproteobacteria; Pseudomonas, Acinetobacter, and Shewanella of Gammaproteobacteria; Arcobacter of Epsilonproteobacteria; Sphingobacterium of Sphingobacteriia; Trichococcus of Bacilli; and Leucobacter of Actinobacteria. The previously unrecorded species were further characterized by examining their gram-staining, colony and cell morphology, biochemical properties, and phylogenetic position.

Metal additive manufacturing (AM) technologies are classified into two groups according to the consolidation mechanisms and densification degrees of the as-built parts. Densified parts are obtained via a single-step process such as powder bed fusion, directed energy deposition, and sheet lamination AM technologies. Conversely, green bodies are consolidated with the aid of binder phases in multi-step processes such as binder jetting and material extrusion AM. Green-body part shapes are sustained by binder phases, which are removed for the debinding process. Chemical and/or thermal debinding processes are usually devised to enhance debinding kinetics. The pathways to final densification of the green parts are sintering and/or molten metal infiltration. With respect to innovation types, the multistep metal AM process allows conventional powder metallurgy manufacturing to be innovated continuously. Eliminating cost/time-consuming molds, enlarged 3D design freedom, and wide material selectivity create opportunities for the industrial adoption of multi-step AM technologies. In addition, knowledge of powders and powder metallurgy fuel advances of multi-step AM technologies. In the present study, multi-step AM technologies are briefly introduced from the viewpoint of the entire manufacturing lifecycle.

원전 해체 공정 중 다량의 콘크리트 방사성 폐기물의 절단 과정에서 불가피하게 방사성 에어로졸이 생성된다. 방사성 에어 로졸은 인체 호흡기 흡착에 의한 내부피폭을 유발하기 때문에 작업자의 방사선 방호를 위한 내부피폭평가가 필수적으로 시행되어야 한다. 그러나 실제 작업환경의 에어로졸 특성값을 사용하기에는 선행 연구가 미비하며 콘크리트에 포함된 방사성 핵종의 수가 많기 때문에 정확한 작업자 내부피폭평가를 위해서는 상당한 시간과 인력이 필요하다. 따라서, 본 연구에서는 사전 연구된 콘크리트 에어로졸 특성값을 활용하여 원전 해체 전 절단 작업자의 내부 피폭량을 빠르게 예측할 수 있는 새로운 방법론을 제시하고자 한다. 본 연구팀은 콘크리트 절단 시 발생하는 사전 연구에서 발표된 에어로졸의 수농도 크기 분포데이터를 뉴턴-랩슨법을 이용하여 피폭평가 계산에 필요한 방사능중앙 공기중역학직경(Activity Median Aerodynamic Diameter)값으로 변환하였다. 또한 원전 정지 10년 후 비방사능 값을 ORIGEN code로 계산하였으며, 최종적으로 핵종별 예 탁유효선량을 IMBA 프로그램을 이용하여 계산하였다. 핵종별 예탁유효선량값을 비교한 결과 152Eu에 의한 최대 예탁유효선량은 전체 선량값의 83.09%를 차지하고, 152Eu를 포함한 상위 5개 원소(152Eu, 154Eu, 60Co, 239Pu, 55Fe)의 경우 최대 99.63%를 차지함을 확인하였다. 따라서 원전 해체 전 콘크리트의 구성 원소 중 상위 5개 주요 원소 측정을 먼저 시행한다면 더 빠르고 원활한 방사능 피폭관리 및 해체 작업 안전성 평가가 가능할 것으로 판단된다.

Various elements of Fabrication (FAB), mass production of existing products, new product development and process improvement evaluation might increase the complexity of production process when products are produced at the same time. As a result, complex production operation makes it difficult to predict production capacity of facilities. In this environment, production forecasting is the basic information used for production plan, preventive maintenance, yield management, and new product development. In this paper, we tried to develop a multiple linear regression analysis model in order to improve the existing production capacity forecasting method, which is to estimate production capacity by using a simple trend analysis during short time periods. Specifically, we defined overall equipment effectiveness of facility as a performance measure to represent production capacity. Then, we considered the production capacities of interrelated facilities in the FAB production process during past several weeks as independent regression variables in order to reflect the impact of facility maintenance cycles and production sequences. By applying variable selection methods and selecting only some significant variables, we developed a multiple linear regression forecasting model. Through a numerical experiment, we showed the superiority of the proposed method by obtaining the mean residual error of 3.98%, and improving the previous one by 7.9%.

한국산 긴뺨자루맵시벌아과의 미기록종인 미소얼굴긴뺨자루맵시벌(신칭)을 확인하고 국내에 처음으로 보고한다. 본 종의 상위분류군인 얼 굴긴뺨자루맵시벌속은 농업과 임업 해충인 파리목, 나비목, 딱정벌레목에 내부 기생하는 것으로 알려져 있다. 본 논문에는 미소얼굴긴뺨자루맵시 벌의 기재 및 주요 형질 사진을 제공한다.

‘Big Bang’ 품종은 꽃이 크고 생육이 왕성하며 엽소 및 잎 마름병에 강한 백합 신품종을 육성하기 위하여 2010년 충남농 업기술원 태안백합시험장에서 교배한 OT(Oriental hybrid × Trumpet hybrid) 백합의 종간교잡종이다. 모본으로는 노랑색의 OT백합 ‘Biarits’ 품종을, 부본으로는 백색의 오리엔탈백합 ‘O11-149’ 계통을 화주절단수분법에 의해 교배한 후 2010년부터 2013년까지 기내 종자배양 및 증식 육묘하여 2014년 우수 계통(OT14-6)을 1차 선발하였다. 2016년부터 2018년도에 걸쳐 ‘Nymph’ 품종을 대조품종으로 하여 일반재배를 통한 특성 검정을 실시하였으며, 2016년 화훼연구소 백합 육성계통 평가 회에서 우수계통으로 선발되어 ‘Big Bang’로 명명한 후 충청 남도와 농촌진흥청 농작물직무육성 신품종선정위원회 심의를 거쳐 국립종자원에 품종보호출원 하였다. ‘Big Bang’ 품종의 자연개화는 중부지역에서 6월 16일로 ‘Nymph’ 품종과 비슷하였고 초장은 155.3cm이었다. 적색 반점에 복색(백색+적색)의 화색과 사발화형의 꽃모양을 나타내었다. 재배에 있어서는 진딧물과 잎마름병 등의 병해충 방제를 주기적으로 실시하고, 영양분 관리 등 일반적인 재배관리를 통해 안정적인 구근생산 및 고품질 절화가 가능하다.

This study aims at identifying how the Korean scholarly group's internet language features changed during the last 10 years. For this study, 2,450 written texts on the same web-site in which a previous study collected data were analyzed. This comparison study showed the following results: 1)First of all, the scholarly group's internet texts still involved standard language, high-quality vocabulary and long sentences; 2)However, it was very difficult to find Chinese characters and the percentage of the usage of English increased significantly; 3)Presenting objective data and numbering were still frequently seen; 4)Furthermore, typical internet languages such as slang, argot and abbreviations began to appear; 5)Texts showing self-reflection and teaching tone have been decreased. Instead, texts implying psychological pressure and worries about their jobs have increased; 6)The biggest change was that most of communicator's names were written in English (or unidentified words) or commonly used internet names. This study concludes that comparing to the previous study, the scholarly group's internet language features have changed (although some based on occupational variables remained the same), and that these changes might be affected by social changes taking place in the scholarly group.