• Wind and Structures
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• 제34권1호
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• pp.43-58
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• 2022

The BARC flow is studied via Direct Numerical Simulation at a relatively low turbulent Reynolds number, with focus on the geometrical representation of the leading-edge (LE) corners. The study contributes to further our understanding of the discrepancies between existing numerical and experimental BARC data. In a first part, rounded LE corners with small curvature radii are considered. Results show that a small amount of rounding does not lead to abrupt changes of the mean fields, but that the effects increase with the curvature radius. The shear layer separates from the rounded LE at a lower angle, which reduces the size of the main recirculating region over the cylinder side. In contrast, the longitudinal size of the recirculating region behind the trailing edge (TE) increases, as the TE shear layer is accelerated. The effect of the curvature radii on the turbulent kinetic energy and on its production, dissipation and transport are addressed. The present results should be contrasted with the recent work of Rocchio et al. (2020), who found via implicit Large-Eddy Simulations at larger Reynolds numbers that even a small curvature radius leads to significant changes of the mean flow. In a second part, the LE corners are fully sharp and the exact analytical solution of the Stokes problem in the neighbourhood of the corners is used to locally restore the solution accuracy degraded by the singularity. Changes in the mean flow reveal that the analytical correction leads to streamlines that better follow the corners. The flow separates from the LE with a lower angle, resulting in a slightly smaller recirculating region. The corner-correction approach is valuable in general, and is expected to help developing high-quality numerical simulations at the high Reynolds numbers typical of the experiments with reasonable meshing requirements.

• 한국소프트웨어감정평가학회 논문지
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• 제16권2호
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• pp.163-172
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• 2020

최근 인공지능과 빅데이터, 자연어처리 기술을 포함한 4차 산업혁명 관련 기술이 발전하면서 개인이나 팀 단독의 연구 및 개발 작업 방식의 한계를 가져오고 있다. 이런 한계를 극복하기 위하여 자신의 기술을 공개하고 협업하는 오픈소스 소프트웨어 개발 방식이 활발해지고 있으며, 회사 내부에서도 유사 개발 방법을 적용하여 회사 구성원들의 참여를 독려하고 품질을 개선하는 노력을 진행하고 있다. 이런 경향을 반영하여 IT 기술을 주도하는 선도 회사들은 적극적으로 오픈소스와 이너소스로 대변되는 공개 개발방식에 대한 지원 정책들을 제시하고 있다. 본 논문에서는 최근 활발히 논의되고 있는 오픈소스 모델, 이너소스 모델 및 그와 유사한 DevOps 모델을 소개하고 각각의 특징 및 구성 요소를 비교하였다. 비교 결과를 바탕으로 어떤 특정 모델의 우수성을 주장하는 것보다는 고객의 요구사항을 만족하면서 질적 향상을 도모할 수 있도록 각 장점에 따라 개인 또는 소속 기관의 소프트웨어 개발정책을 수립할 수 있을 것으로 판단한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권7호
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• pp.2257-2285
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• 2022

Cyber-physical systems (CPS) have been growing exponentially due to improved cloud-datacenter infrastructure-as-a-service (CDIaaS). Incremental expandability (scalability), Quality of Service (QoS) performance, and reliability are currently the automation focus on healthy Tier 4 CDIaaS. However, stable QoS is yet to be fully addressed in Cyber-physical data centers (CP-DCS). Also, balanced agility and flexibility for the application workloads need urgent attention. There is a need for a resilient and fault-tolerance scheme in terms of CPS routing service including Pod cluster reliability analytics that meets QoS requirements. Motivated by these concerns, our contributions are fourfold. First, a Distributed Non-Recursive Cloud Model (DNRCM) is proposed to support cyber-physical workloads for remote lab activities. Second, an efficient QoS stability model with Routh-Hurwitz criteria is established. Third, an evaluation of the CDIaaS DCN topology is validated for handling large-scale, traffic workloads. Network Function Virtualization (NFV) with Floodlight SDN controllers was adopted for the implementation of DNRCM with embedded rule-base in Open vSwitch engines. Fourth, QoS evaluation is carried out experimentally. Considering the non-recursive queuing delays with SDN isolation (logical), a lower queuing delay (19.65%) is observed. Without logical isolation, the average queuing delay is 80.34%. Without logical resource isolation, the fault tolerance yields 33.55%, while with logical isolation, it yields 66.44%. In terms of throughput, DNRCM, recursive BCube, and DCell offered 38.30%, 36.37%, and 25.53% respectively. Similarly, the DNRCM had an improved incremental scalability profile of 40.00%, while BCube and Recursive DCell had 33.33%, and 26.67% respectively. In terms of service availability, the DNRCM offered 52.10% compared with recursive BCube and DCell which yielded 34.72% and 13.18% respectively. The average delays obtained for DNRCM, recursive BCube, and DCell are 32.81%, 33.44%, and 33.75% respectively. Finally, workload utilization for DNRCM, recursive BCube, and DCell yielded 50.28%, 27.93%, and 21.79% respectively.

• 기록학연구
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• 제76호
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• pp.61-117
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• 2023

본 연구는 대통령 지식 인프라를 연계하고 통합하여 관련 정보와 데이터를 적극적으로 공유 및 개방하는 '대통령디지털아카이브 플랫폼' 구축의 필요성을 제기한다. 대통령디지털아카이브 플랫폼은 대통령기록을 매개로 '대통령기록관', '대통령 관련 기록 소장기관' 그리고 '이용자'가 상호작용할 수 있는 '거버넌스 플랫폼'으로 대통령기록의 특성과 가치를 널리 알리고, 새로운 패러다임을 창출할 수 있는 계기를 마련할 수 있을 것이다. 이를 위해 '대통령기록포털 분석'과 '대통령 관련 기록 소장기관 분석'을 진행하여 대통령디지털아카이브 플랫폼 구축 시 개선점과 요구사항을 파악하고, 국내외 '디지털아카이브 플랫폼 사례분석'을 통해 시사점을 도출하여 대통령기록서비스 강화를 위한 방안을 논하였다. 마지막으로 그 결과를 바탕으로 플랫폼 구축을 위한 단계별 실행전략을 제시하였다.

• 한국전자거래학회지
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• 제27권2호
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• pp.137-152
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• 2022

마이데이터 서비스에 대한 소비자 수용의도 향상, 즉 고객 정보의 자발적 제공은 기업 가치 창출과 함께 마이데이터 산업의 안정적 성장을 위해 매우 필요한 요소이며 데이터 가치 상승으로 인한 유출과 침해 증가는 이러한 마이데이터 서비스 이용에 부정적 영향을 미쳐 금융소비자의 개인정보 제공을 통한 양질의 맞춤형 서비스 수요를 감소시킬 수 있다. 본 연구는 금융소비자가 인지할 수 있는 보안위험과 이를 보완 할 수 있는 보안요인을 도출하고 이러한 보안요인이 마이데이터 서비스 수용의도에 어떠한 영향을 미치는지를 파악하여 금융소비자의 수용의도를 높이고 안전한 활용을 확대할 수 있는 전략을 도출하기 위한 유용한 시사점을 제공하고자 한다. 연구결과를 통해 마이데이터 서비스 필수 요건인 정보주체로부터 제공받은 정보의 안정성과 투명성 보장을 위해 적용하는 보안요인은 금융서비스라는 측면에서 편의성 또한 고려해야 함을 확인하였다.

• 문화기술의 융합
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• 제9권4호
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• pp.717-726
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• 2023

본 연구에서는 골프웨어의 요건으로써 디자인, 활동성, 기능성, 쾌적성, 내구성 등 다양한 소비자 니즈에 적합한 골프웨어의 설계 및 연구개발을 위한 기초자료로 연 1회 이상 라운딩 활동과 골프 연습 활동을 꾸준히 하고 있는 의도표집된 연구 대상자 40~60대 남녀 64명을 대상으로 골프웨어 착용실태와 만족도 조사를 하였다. 그 결과, 현재 보유하고 있는 골프웨어가 연구 집단의 소비자들을 충분히 만족시키지 못하고 있는 것을 확인할 수 있었다. 이에 합리적인 가격, 연령에 맞는 디자인, 패턴개발, 활동성과 쾌적성을 고려한 소재선택 등을 고려한 중년을 위한 골프웨어가 연구 개발되어야 할 것이다. 나아가 골프활동 시 노출되는 외부환경으로부터 신체를 보호할 수 있는 기능성이 부여된 골프웨어가 개발된다면 보다 쾌적한 골프활동을 하는데 기여할 것으로 사료되었다.

• 대한토목학회논문집
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• 제26권1A호
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• pp.213-218
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• 2006

본 논문에서는 최근 고도처리로 생산되는 순환골재의 품질을 분석하고, 이를 구조용 콘크리트에 적용하였을 경우 구조물의 설계 및 해석에서 가장 기초적으로 요구되는 물성인 압축강도와 탄성계수의 변화를 순환굵은골재 및 순환잔골재의 치환율에 따라 검토하고자 하였다. 실험결과 순환굵은골재 및 순환잔골재는 KS F 2573의 1종의 기준을 만족하였으며, 순환골재의 치환율이 증가할수록 순환골재콘크리트의 압축강도 및 탄성계수는 감소하는 경향이 나타났다. 특히 순환골재로 전량치환 하였을 경우의 압축강도와 탄성계수는 일반골재콘크리트 대비 약 13%와 약 31%가 저하되었다. 이러한 실험결과를 기초로 순환 골재 치환율에 따른 순환골재콘크리트의 압축강도 및 탄성계수 추정식을 새로이 제안하였으며, 기존의 국내외 실험결과와 비교하여 그 타당성을 검토하였다.

• Journal of Ginseng Research
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• 제48권1호
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• pp.103-111
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• 2024

Background: Ginseng (Panax ginseng Mayer) is an important natural medicine. However, a long culture period and challenging quality control requirements limit its further use. Although artificial cultivation can yield a sustainable medicinal supply, research on the association between the transplantation and chaining of metabolic networks, especially the regulation of ginsenoside biosynthetic pathways, is limited. Methods: Herein, we performed Liquid chromatography tandem mass spectrometry based metabolomic measurements to evaluate ginsenoside accumulation and categorise differentially abundant metabolites (DAMs). Transcriptome measurements using an Illumina Platform were then conducted to probe the landscape of genetic alterations in ginseng at various ages in transplantation mode. Using pathway data and crosstalk DAMs obtained by MapMan, we constructed a metabolic profile of transplantation Ginseng. Results: Accumulation of active ingredients was not obvious during the first 4 years (in the field), but following transplantation, the ginsenoside content increased significantly from 6-8 years (in the wild). Glycerolipid metabolism and Glycerophospholipid metabolism were the most significant metabolic pathways, as Lipids and lipid-like molecule affected the yield of ginsenosides. Starch and sucrose were the most active metabolic pathways during transplantation Ginseng growth. Conclusion: This study expands our understanding of metabolic network features and the accumulation of specific compounds during different growth stages of this perennial herbaceous plant when growing in transplantation mode. The findings provide a basis for selecting the optimal transplanting time.

• 대한간호학회지
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• 제54권2호
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• pp.211-223
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• 2024

Purpose: Recent studies have focused on policies aimed at supporting the independence of individuals with disabilities in communities. As part of this initiative, supportive housing, integrated care, and residential spaces offer tailored services based on individual needs and autonomy. The attitudes and knowledge of the administrators supporting supportive housing residents regarding health management can influence the well-being of individuals with disabilities. Therefore, this study aimed to explore the challenges faced by supporting housing workers in enhancing the self-management skills of individuals with disabilities. Methods: In this qualitative study, focus group interviews were conducted in August 2023 with nine administrators working to support housing in Seoul. Qualitative content analysis was used to analyze the interview data. Results: The needs and challenges in enhancing the self-management skills of individuals with disabilities were as follows: (1) the complexity of health management challenges, (2) bidirectional strategies for strengthening health management capabilities, and (3) support for systematic health management. Additionally, eight subthemes were derived. Conclusion: By investigating the difficulties experienced and identifying the necessary support requirements for supportive housing workers, this study seeks to uncover insights and identifies areas for improvement and strategies for health management. This study acknowledges the educational and institutional support necessary to improve the health and quality of life of individuals with disabilities residing in supportive housing.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 추계학술대회
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• pp.19-19
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• 2022

Hulled and naked oat is a perspective crop for the low input production systems due to its low requirements for soil quality and nutrition. Oats have good competitive ability against weeds and can provide appropriate yield in organic farming in comparison with other cereal species such as wheat or barley. It is a perspective crop from the point of view of use in the food industry too. The aim of our study was to compare the production and quality parameters of naked and hulled oat grown in both organic (OF) and conventional fields (CF). Small plot trials were conducted in two locations in the Czech Republic (České Budějovice, Prague) for four years (2018-2021) in two production systems (OF, and CF). We used four varieties of hulled oat (Korok, Kertag, Raven, Seldon) and one variety of naked oat (Patrik). During the vegetation, agronomically important data were recorded. After harvest samples were processed in the laboratory and analyzed selected quality parameters of grain dry matter (the protein content was determined by the Kjeldahl method, starch content in grain according to Ewers, fat content in grain dry matter by the modified method according to Soxhlet, and ash content in grain dry matter). The data were evaluated using the program STATISTICA version 13.2, StatSoft, Inc., California, USA. It is clear from the results that the number of panicles before the harvest was influenced by the location, cultivation system, year, and, to a lesser extent, the influence of the variety. The number of panicles in OF averaged 340 per square meter, which was 90% of the value of CF. For thousand grain weight (TGW), a significantly predominant effect of year was found. The independent effect of location on TGW was statistically not significant. Grain yield was predominantly influenced by cultivation system and location. In OF, it reached an average of 3.97 t.ha^-1, which was 75% of the yield of CF. As part of the evaluation of the basic grain quality indicators, the content of protein, starch, fat, and ash in the dry matter of the grain was evaluated. The content of protein in the dry matter of the grain was predominantly influenced by year, followed by the influence of the variety and a fairly comparable influence of the cultivation system and locality. On average, it achieved 16.05% in OF and 17.01% in CF. The starch content was then related to the protein content, where as a result of the lower protein content in the grain of OF oats, the content of starch and fat was on the contrary increased. The year turned out to be the most significant factor, affecting both the starch content in the dry matter of the grain and the fat content. This was followed again by a fairly comparable influence on the cultivation system and locality. The influence of the cultivation system and location was not statistically significantly applied in the case of ash content in dry matter. Based on our results we can propose both types of oat (hulled and naked) as perspective crops for OF. An organic farmer can expect to achieve stable yields which, in less favorable conditions for the production of cereals in the OF, may be close to the level of conventional yields. In the future, it will be important to change agrotechnology in OF and increase oat yield because this crop has a good potential to grow in areas with low nitrogen input or less fertile soil.