Recently, hollow carbon spheres (HCS) have aroused great interests in the field of energy storage and conversion owing to their unique morphology, structure and other charming properties. Nevertheless, unsatisfactory electrical conductivity and relatively poor volumetric energy density caused by inevitable gaps between discrete carbon spheres greatly impede the practical application of HCS. In this work, for the first time we propose a novel dual-template strategy and successfully fabricate interconnected 3D hollow N-doped carbon network (HNCN) by a facile and scalable pyrolysis process. By systematical characterization and analysis, it can be found that HNCN is assembled by HCS and lots of mesoporous carbon. Compared to the counterparts, the obtained HNCN exhibits unique 3D interconnected architecture, larger specific surface area, hierarchical meso/macropore structure, higher structure defects, higher N doping amount and more optimized N configurations (especially for pyridinic-N and graphitic-N). As a result, these advantageous features endow HNCN with remarkably promoted electrochemical performance for supercapacitor and oxygen reduction reaction. Clearly, our proposed dual-template strategy provides a good guidance on overcoming the intrinsic shortcomings of HCS, which undoubtedly broadens their application in energy storage and conversion.

목적 : 본 연구는 국민건강영양조사 제7기(2016-2018) 원시자료를 이용하여, 녹내장에 영향을 미칠 수 요소 들과 그 연관성 정도를 파악하고자 하였다. 방법 : 녹내장 의사진단여부 및 만성질환에 응답한 만 30세 이상의 성인 총 5,244명을 대상으로, 녹내장에 영 향을 미칠 수 있는 신체활동과 만성질환 유병간의 기술통계 분석과 로지스틱회귀분석을 하였다. p<0.050인 경우 유의한 것으로 판단하였다. 결과 : 녹내장은 나이가 많아질수록 위험성이 높아지는 것을 알 수 있었다. 녹내장을 가지고 있는 사람의 신체 활동은 하루 중 앉아서 지내는 시간이 길고, 일주일에 근육운동을 하는 횟수가 많은 것으로 나타났다. 또한 변형 근로시간이 유의하게 많은 것으로 나타났다. 만성병과 관련하여서는 연령과 성별을 보정한 로지스틱회귀분석에서 이상지질혈증을 가지고 있는 사람들은 그렇지 않은 경우보다 녹내장의 발생 확률이 1.44배로 높아질 수 있는 것 으로 나타났다. 결론 : 본 연구는 녹내장 발병에 영향을 미치는 요인을 광범위하게 분석했다는 점에 의의가 있으며, 녹내장에 영향을 미칠 수 있는 생활 속 요인들을 파악함으로써 녹내장 발생 및 유병의 진행을 늦추는데 도움이 되고자 한다.

Different materials have been shown to "catalyze" carbon nanotube (CNT) growth in chemical vapor deposition (CVD) when they become nano-sized particles. Catalysts, which act as a kind of "seed" for CNT growth, show two types of behavior in the CVD method; precipitation of carbon atoms from the eutectic alloy forming a kind of alloy with carbon; the fact that the catalyst remains as a solid phase and forms a carbon surface layer during the CVD process. This study examines the relationship between the iron-group and non-iron-group catalyst types and the catalyst concentration and growth time of CVD-based CNT growth via emphasizing growth mechanisms. The novelty of this work is to compare and evaluate the effects of catalyst type, concentration, and growth time, which are three critical CVD parameters, on the final nanotube morphology. It was utilized five different catalysts ( Fe2O3, Fe3O4, Nb2O5, Au, and Pt), three different growth durations (3, 5, and 7 min), and three different catalyst concentrations (2, 4, and 6 wt%) to explore the morphological differences on CNT synthesis by CVD under the same process parameters. The results demonstrated that catalyst type is the most influential parameter in CVD-based CNT synthesis, while catalyst concentration and growth time are indispensable elements for the uniformity and small diameter in the final morphology.

Soft magnetic powder materials are used throughout industries such as motors and power converters. When manufacturing Fe-based soft magnetic composites, the size and shape of the soft magnetic powder and the microstructure in the powder are closely related to the magnetic properties. In this study, Fe-Si-Al-P alloy powders were manufactured using various manufacturing process parameter sets, and the process parameters of the vacuum induction melt gas atomization process were set as melt temperature, atomization gas pressure, and gas flow rate. Process variable data that records are converted into 6 types of data for each powder recovery section. Process variable data that recorded minute changes were converted into 6 types of data and used as input variables. As output variables, a total of 6 types were designated by measuring the particle size, flowability, apparent density, and sphericity of the manufactured powders according to the process variable conditions. The sensitivity of the input and output variables was analyzed through the Pearson correlation coefficient, and a total of 6 powder characteristics were analyzed by artificial neural network model. The prediction results were compared with the results through linear regression analysis and response surface methodology, respectively.

국립원예특작과학원에서 2016년 거베라 신품종 ‘샤이핑크 (Shy Pink)’를 육성하였다. ‘Shy Pink’는 2008년 10월부터 2008년 11월까지 녹색 화심의 분홍색 반겹꽃 ‘프리존’과 갈 색 화심의 살구색 반겹꽃 ‘아틸리아’를 교배하여 획득한 실생 72개체 중에서 2009년부터 2016년까지 생육 및 개화특성검 정을 거쳐 선발한 절화용 대륜 거베라 품종이다. ‘샤이핑크 (Shy Pink)’는 화형이 안정적인 갈색 화심의 연분홍색(RHS R49A) 반겹꽃 대륜계 품종이다. 꽃은 평균 직경이 12.4cm이 고, 내부설상화와 화반의 직경은 각각 7.2cm와 2.3cm이다. 외부설상화의 길이와 폭은 각각 6.0cm와 1.2cm로 꽃잎이 좁은 도란형이다. 꽃대 직경은 상부 6.1mm, 중부 7.0mm 정 도로 강건하며, 꽃대의 길이는 48.9cm이다. 절화수명은 12.1 일로 대조구인 ‘하모니(Harmony)’ 12.0일로 유사하였지만 절 화수명이 길며, 연간 채화량은 52.8본/주로 다수성 품종이다.

The Seoul Radio Astronomy Observatory (SRAO) operates a 6.1-meter radio telescope on the Gwanak campus of Seoul National University. We present the efforts to reform SRAO to a Very Long Baseline Interferometry (VLBI) station, motivated by recent achievements by millimeter interferometer networks such as Event Horizon Telescope, East Asia VLBI Network, and Korean VLBI Network (KVN). For this goal, we installed a receiver that had been used in the Combined Array for Research in Millimeterwave Astronomy and a digital backend, including an H-maser clock. The existing hardware and software were also revised, which had been dedicated only to single-dish operations. After several years of preparations and test observations in 1 and 3-millimeter bands, a fringe was successfully detected toward 3C 84 in 86 GHz in June 2022 for a baseline between SRAO and KVN Ulsan station separated by 300 km. Thanks to the dual frequency operation of the receiver, the VLBI observations will soon be extended to the 1 mm band and verify the frequency phase referencing technique between 1 and 3-millimeter bands.

본 연구는 자연주의적 결정론적 특징이 오거스트 스트린드베리의 『미스 줄리』와 버나드 쇼의 『상심의 집』의 중심 인물들을 통해 어떻게 나타나는지를 비교, 고찰한다. 사회적 환경에서의 심리적 갈등의 결과로 자연주의적 결정론을 강조하는 스트린드베리의 희곡은 비극적 파멸을 통한 개인의 고통과 욕망의 결과를 보여준다. 스트린드베리는 『미스 줄리』에서 생존을 위한 남녀의 무자비한 성적 투쟁을 중심으로 인간 본성의 도덕적 타락과 죄를 묘사한다. 반면, 쇼의 『상심의 집』은 주인공 개인의 욕망이나 환상에 의한 파괴보다는 사회다윈주의적 관점에서 희망적인 절망을 역설적으로 강조한다. 쇼는 『상심의 집』을 통해 인류를 절망에 빠뜨린 환상이 야기한 전쟁에서 생존을 위한 불가피한 선택과 결과에 대한 자연주의적 시각을 보여준다. 스트린드베리와 쇼의 극에 등장하는 여주인공들의 교차된 욕망과 사랑은 결정론적 운명이라는 종교적, 사회적 딜레마를 상징한다.

As the uncertainty of technology development and market needs increases due to changes in the global business environment, the interest and demand for R&D activities of individual companies are increasing. To respond to these environmental changes, technology commercialization players are paying great attention to enhancing the qualitative competitiveness of R&D. In particular, R&D companies in the marine and fishery sector face many difficulties compared to other industries. For example, the R&D environment is barren, it is challenging to secure R&D human resources, and it is facing a somewhat more difficult environment compared to other sectors, such as the difficulty in maintaining R&D continuity due to the turnover rate of researchers. In this study, based on the empirical data and patent status of private companies closely related to the R&D technology status, big data analysis, and simulation analysis methods were used to identify the relative position of individual companies' R&D capabilities and industrial perspectives. In this study, based on industrial evidence and patent applications closely related to the R&D technology status, the R&D capabilities of individual companies were evaluated using extensive data analysis and simulation analysis methods, and a statistical test was performed to analyze if there were differences in capabilities from an industrial point of view. At this time, the industries to be analyzed were based on all sectors, the maritime industry, the fisheries industry, and the maritime industry integration sector. In conclusion, it was analyzed that there was a certain level of difference in the R&D capabilities of individual companies in each industry sector, Therefore when developing a future R&D capability system, it was confirmed that it was necessary to separate the population for each industry and establish a strategy.