• 국제학술발표논문집
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• The 8th International Conference on Construction Engineering and Project Management
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• pp.425-432
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• 2020

In order to improve the sustainability and smart construction, it is discussed arguably that developing and applying consistent "standard model" to plan business, design, construct and operate a building is considered to be one of the effective and efficient approach. The scope of this article is to examine, from the international developer's perspective, the "standard model" approach of a hotel brand to building projects in the UK, and also to explore potential role of project team to mitigate any local difference at the project level. These projects are developed by the same developer adopting the same business plan, design and operation to each project. In order to clarify the actual and likely difference in construction results, reference is also made to those building projects located in other geographical markets including Japan, Germany and USA, and focus is given on the analysis of its programme and cost. Principle findings are that there exists geographical difference especially in environmental and planning system, and that major local difference is found at least in the programme at the design stage. In contrast, the difference in the building cost itself may not be necessarily considered major if currency exchange rate being taken into account appropriately. It is also observed that there were cases where any difference in the programme was mitigated by taking different approach to procuring and defining roles of management and professional team at the project level. In conclusion, from the international developer's perspective, the geographical difference of the "construction system" surrounding building projects can typically lead to major prolongation of programme, however, these different construction results could be mitigated at least to a certain extent by introducing appropriate changes to the role of project team.

• Smart Structures and Systems
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• 제30권5호
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• pp.479-500
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• 2022

In this study, a new type of isolation bearing is proposed by combining S-shaped steel plate dampers (SSDs) with a spherical steel bearing, and the seismic control effect of a five-span standard high-speed railway bridge is investigated. The advantages of the proposed S-shaped steel damping friction bearing (SSDFB) are that it cannot only lengthen the structural periods, dissipate the seismic energy, but also prevent bridge unseating due to the restraint effectiveness of SSDs in the large relative displacements between the girders and piers. This study first presents a detailed description and working principle of the SSDFB. Then, mechanical modeling of the SSDFB was derived to fundamentally define its cyclic behavior and obtain key mechanical parameters. The numerical model of the SSDFB's critical component SSD was verified by comparing it with the experimental results. After that, parameter studies of the dimensions and number of SSDs, the friction coefficient, and the gap length of the SSDFBs were conducted. Finally, the longitudinal seismic responses of the bridge with SSDFBs were compared with the bridge with spherical bearing and spherical bearing with strengthened shear keys. The results showed that the SSDFB can not only significantly mitigate the shear force responses and residual displacement in bridge substructures but also can effectively reduce girder displacement and prevent bridge unseating, at a cost of inelastic deformation of the SSDs, which is easy to replace. In conclusion, the SSDFB is expected to be a cost-effective option with both multi-stage energy dissipation and restraint capacity, making it particularly suitable for seismic isolation application to high-speed railway bridges.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 추계학술대회
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• pp.143-143
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• 2022

Plant defense systems against pathogens have been studied extensively and are currently a hot topic in plant science. Using a reverse genetics technique, this study looked into the involvement of the NO-downregulated NAD(P)-binding Rossmann-fold superfamily gene in plant growth and defense in Arabidopsis thaliana. For this purpose, the knockout and overexpressing plant of the candidate gene along with the relevant controls were exposed to control, oxidative and nitro-oxidative stresses. The results showed that candidate gene negatively regulates plants' root and shoot lengths. To investigate the role of the candidate gene in plant basal defense, R-gene-mediated resistance and systemic acquired resistance (SAR) plants were challenged with virulent or avirulent strains of Pseudomonas syringae pathovar tomato (Psf) DC3000. The results showed that the candidate gene negatively regulates plants' basal defense, R-gene-mediated resistance and SAR. Further characterization via GO analysis associated the candidate gene with metabolic and cellular processes and response to light stimulus, nucleotide binding and cellular location in the cytosol and nucleus. Protein structure analysis indicated the presence of a canonical Oxidoreductase family NAD (P)-binding Rossmann fold domain of 120 amino acids with a total of 121 plant homologs across 35 different plant species in the clad streptophyta. Arabidopsis eFP browser showed its expression in almost all the above-ground parts. Protein analysis indicated C225 and C359 as potential targets for S-Nitrosylation by NO. SMART analysis indicated possible interactions with mevalonate/galactokinase, galacturonic acid kinase, arabinose kinase, putative xylulose kinase, GroES-like zinc-binding alcohol dehydrogenase and various glyceraldehyde-3-phosphate dehydrogenases.

• 한국경제지리학회지
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• 제26권2호
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• pp.155-168
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• 2023

스마트 건강도시, 지역, 지오인터넷(geo-internet) 및 블록체인 기술의 통합으로 인해 건강지리학이 중요해 졌다. 본 연구는 개인과 집단이 직면한 특정한 건강 문제를 중심으로 지리와 건강의 교차점을 탐구한다. 학술문헌들을 바탕으로 관찰 및 기술적 방법을 사용하여 세계적인 건강 문제를 해결하는데 중요한 사회경제적 요인을 탐색하고, 지역적 접근방식을 취한다. 본 연구의 의의는 우즈베키스탄의 보건 문제에 대한 간결한 사례 연구를 제시하여 귀중한 통찰력을 제공하는데 있다. 본 연구에 사용된 기사와 UN 출판물의 데이터를 바탕으로 한 분석은 건강지리학의 학제 간 연구의 특성을 보여주고, 분석 결과는 연구자와 정책 입안자에게 실용적인 적용 가능성을 제공한다. 또한, 전체적인 연구 결과는 지역별 질병을 해결하는 데 있어 지리학 및 보건 건강과학의 중요한 역할을 강조하는 동시에 질병 발생을 포함한 환경 위험 및 건강 영향을 이해하는 데 있어 공간 분석의 중요성을 강조한다.

• Smart Structures and Systems
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• 제32권6호
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• pp.349-358
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• 2023

Real-Time Hybrid Testing (RTHT) requires the numerical substructure calculations to be completed within the defined integration time interval due to its real-time loading demands. For solving the problem, A Real-Time Hybrid Testing based on Restart-Loading Technology (RTHT-RLT) is proposed in this paper. In the proposed method, in case of the numerical substructure calculations cannot be completed within the defined integration time interval, the experimental substructure was returned back to the initial state statically. When the newest loading commands were calculated by the numerical substructure, the experimental substructure was restarted loading from the initial state to the newest loading commands so as to precisely disclosing the dynamic performance of the experimental substructure. Firstly, the methodology of the RTHT-RLT is proposed. Furthermore, the numerical simulations and experimental tests on one frame structure with a viscous damper are conducted for evaluating the feasibility and effectiveness of the proposed RTHT-RLT. It is shown that the proposed RTHT-RLT innovatively renders the nonreal-time refined calculation of the numerical substructure feasible for the RTHT. The numerical and experimental results show that the proposed RTHT-RLT exhibits excellent performance in terms of stability and accuracy. The proposed RTHT-RLT may have broad application prospects for precisely investigating the dynamic behavior of large and complex engineering structures with specific experimental substructure where a restarting procedure does not affect the relevant hysteretic response.

• 한국수산과학회지
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• 제56권6호
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• pp.810-817
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• 2023

Oysters are a highly consumed seafood throughout Korea, but they have a short shelf life because they support rapid microbial growth due to their of high moisture content and fragile muscle tissue. We examined natural food additives including lactic acid bacteria fermentation powder, rosemary extract, and lemon juice for their ability to preserve raw oyster Crassostrea gigas quality. Samples were stored at 4℃, and microbiological and physicochemical analyses were conducted. Among the natural additives tested, lemon juice was the most effective. Lemon juice was thus applied at different concentrations (50-300 ppm) to quantitatively assess its effect on total viable cell count, pH, glycogen, soluble protein, and turbidity. 200 ppm was confirmed to be optimal, and is projected to extend shelf life by 2 days compared to the control group.

• 한국재난정보학회 논문집
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• 제19권4호
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• pp.844-850
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• 2023

연구목적: 본 논문은 백열전구를 이용하여 단락보호 전원공급 장치를 개발하고, 이를 학습 교구로 활용하는 연구에 관한 것이다. 전기 안전과 에너지 절약을 동시에 고려한 이 연구는 교육과 산업 분야에서 중요한 응용 가능성을 가지고 있다. 백열전구를 활용한 단락보호 전원공급 장치는 기존의 전원공급 장치와 비교하여 안전성과 효율성을 향상시키는데 도움이 되며, 학습 교구로 학습자들에게 전기 안전 교육을 제공함으로써 실생활에서의 전기 안전 지식을 습득하는데 기여한다. 연구방법: 백열전구를 사용하여 단락보호 전원공급 장치를 개발하고 개발된 장치의 성능 평가 및 안전성 확인을 통해 학습 교구로 활용할 수 있는 새로운 전원공급장치를 제작 한다. 결론:백열전구를 활용한 단락보호 전원공급 장치의 개발과 학습 교구로의 응용 가능성을 탐구한 연구이다. 이를 통해 전기 안전과 에너지 절약에 기여할 수 있는 혁신적인 솔루션을 제시하였으며, 교육 분야와 산업 분야에서의 응용 가능성을 열어놓았다. 이러한 연구는 전기 안전 및 에너지 관리 분야에서의 연구와 교육에 기여할 것으로 기대된다.

• Composites Research
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• 제36권5호
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• pp.342-348
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• 2023

최근 웨어러블 소자를 이용한 신체와 주변 온도의 실시간 모니터링에 대한 수요가 급격히 증가하고 있다. 그래핀 기반 써미스터가 고성능 유연 온도 센서로 개발되어 왔다. 본 연구에서는 단일층 그래핀의 온도 측정 성능을 개선하기 위하여 표면에 polyethylenimine(PEI)를 코팅하여 저항 온도 계수(TCR)를 조절하였다. 화학기상증착법(CVD)에 의해 합성한 단일층 그래핀은 습식 전사 공정을 통해 원하는 기판에 전사되었다. PEI에 의한 계면 도핑을 유도하기 위하여, 소수성의 그래핀 표면을 산소 플라즈마 처리를 통해 결함을 최소화하면서 친수성으로 제어하였다. PEI 도핑 효과를 전계효과트랜지스터(FET)를 이용하여 확인하였다. PEI 도핑에 의해서 CVD 그래핀의 TCR 값이 30~50℃의 온도 범위에서 -0.49(±0.03)%/K로 향상된 것을 확인하였다.

• International Journal of Computer Science & Network Security
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• 제23권11호
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• pp.128-132
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• 2023

Investment authorities are broad financial institutions that carefully manage investments on behalf of the national government using a long-term value development approach. To provide a stronger structure or framework for In-vestment Authorities to govern the distribution of funds to public and private markets, we've started research to create a blockchain-based prototype for managing and tracking numerous finances of such authorities. We have taken the case study of Oman Investment Authority (OIA) of Sultanate of Oman. Oman's wealth is held in OIA. It is an organization that oversees and utilizes the additional capital generated by oil and gas profits in public and private markets. Unlike other Omani funds, this one focus primarily on assets outside the Sultanate. The operation of the OIA entails a huge number of transactions, necessitating a high level of transparency and administration among the parties involved. Currently, OIA relies on various manuals to achieve its goals, such as the Authorities and Responsibilities manual, the In-vestment Manual, and the Code of Business Conduct, among others. In this paper, we propose a Blockchain based framework to manage the operations of OIA. Blockchain is a part of the Fourth Industrial Revolution, and it is re-shaping every industry. The main components of every blockchain are assets and participants. The funds are the major assets in the proposed study, and the participants are the various fund shareholders/recipients. The block-chain's transactions are all safe, secure, and immutable, and it's part of a trustless network. The transactions are simple to follow and verify. By replacing intermediary firms with smart contracts, blockchain-based solutions eliminate any middlemen in the fund allocation process.

• 수산해양기술연구
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• 제59권4호
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• pp.387-398
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• 2023

Conventional aquaculture faces declining productivity, shifting to recirculating aquaculture system (RAS), known for minimizing water usage and maintaining consistent water temperatures for year-round fish growth. Rainbow trout (Oncorhynchus mykiss), a globally important cold-water species and the third most farmed fish in inland waters of Korea, valued for its fecundity and rapid growth. Dissolved oxygen, an important environmental factor affecting fish production and economics, highlights the need for smart aquaculture practices. Since 2018, the rise of intelligent aquaculture platforms, incorporating information and communications technology (ICT), emphasizes the essential role of RAS implementation. This eight-week study aimed to determine the optimal dissolved oxygen concentration for rainbow trout in RAS, utilizing a device for continuous monitoring, control and record. Dissolved oxygen concentrations were set at 5-6 mg/L, 9-10 mg/L, 14-15 mg/L and 17-18 mg/L. The growth rate significantly decreased at 5-6 mg/L, with no significant differences in other experimental groups. In hematological analysis, growth hormone (GH) was significantly highest at 5-6 mg/L, followed by 9-10 mg/L while Insulin-like growth factor-1 (IGF-1) was significantly lowest at 5-6 mg/L. In conclusion, the optimal dissolved oxygen concentration for rainbow trout in RAS is approximately 9-10 mg/L. Higher concentrations do not contribute to further growth or profitability.