• 한국멀티미디어학회논문지
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• 제10권6호
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• pp.799-806
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• 2007

The prototypical smart environment to support the context-aware interactions between user and ubiquitous campus environment based on multi-agent system paradigm is proposed in this paper. In this model, the dynamic Bayesian is investigated to solicit and organize agents to produce information and presentation assembly process in order to allocate the resources for an unseen task across multiple services in a dynamic environment. The user model is used to manage varying user constraints and user preferences to achieve system's goals.

• 반도체디스플레이기술학회지
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• 제22권2호
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• pp.120-127
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• 2023

Recently, metaverse has attracted great attention worldwide with the development of related technologies and the demand for on-tact systems. The ideal metaverse should constitute a virtual world more similar to the realistic society with physical interactions. However, there are many constraints when we construct a virtual world using the existing commercialized metaverse platform. In this paper, we design and implement a university campus-based metaverse which minimizes the constraints, and create a virtual environment maps very similar to the real-world using Unity engine, Photon cloud and Playfab SDK for multi-user accessible to virtual world as a personal avatar. Also, this work includes attractive interaction based on exchange between users. Lastly, we illustrate our implemented metaverse works on Android phone, and it works without difficulty in terms of performance.

• 인터넷정보학회논문지
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• 제22권6호
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• pp.91-97
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• 2021

미국은 CSfC(Commercial Solutions for Classified Program) 제도를 통해 진화하는 사이버공격에 대응하기 위해 국가기관이 민간 상용보안제품을 신속히 국가관에 도입할 수 있도록 공인된 안전성 평가 및 인증을 수행하고 있다. CSfC 프로세스에 등록된 상용보안제품은 신속한 승인 프로세스를 거쳐 국방기관에서 사용할 수 있으며 중복된 평가 없이 상용보안제품을 승인한다. 승인된 보안제품은 국방정보시스템 구현에 필요한 시간, 비용, 승인 프로세스로 인한 비용을 절감할 수 있다. 본 연구는 국방에 도입하기 위해 미국 NSA(National Security Agency)에서 제시한 네트워크 보안 아키텍처 MSC(Multi-Site Connectivity), MA(Mobile Access), Campus WLAN, DAR(Data at Rest) 4종에 대한 보안통제 항목을 분석하였다.

• Animal Bioscience
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• 제35권3호
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• pp.377-384
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• 2022

Objective: This study was conducted to estimate multi-trait genetic parameters for somatic cell score (SCS), milk yield and type traits in Nigerian Dwarf (ND) goats from the United States. Methods: Data from 1,041 ND goats in the United States with kiddings in 95 herds were used to estimate multi-trait genetic parameters for SCS, milk (MILK), fat (FAT), and protein (PROT) yields, and 14 type traits. An 18-trait mixed linear animal model for lactation mean SCS (Log₂), MILK, FAT, PROT, and 14 type traits was applied. A factor analytic approach (FA1) in ASReml software was used to obtain convergence. Results: Averages for SCS were low (2.85±1.29 Log₂), and were 314±110.6, 20.9±7.4, and 14±4.9 kg, respectively, for MILK, FAT, and PROT. Heritabilities for SCS, MILK, FAT, and PROT were 0.32, 0.16, 0.16, and 0.10, respectively. The highest heritabilities for type traits were for stature (0.72), teat diameter (0.49), and rump width (0.48), and the lowest estimates were for dairyness (0.003) and medial suspensory ligament (0.03). Genetic correlations of SCS with MILK, FAT, and PROT were positive but low (0.25, 0.18, and 0.23, respectively). Genetic and phenotypic correlations between MILK, FAT, and PROT were high and positive (≥0.66). Absolute values of genetic correlations involving SCS with type traits were generally low or no different from zero. Most of the phenotypic correlations involving SCS with type traits were low. No serious unfavorable genetic correlations between milk yield traits and SCS or between milk yield traits or SCS and type traits were found. Conclusion: Genetic variation exists in the ND breed for most studied traits. The development of selection programs based on these estimates may help accelerate favorable multi-trait genetic changes in this breed.

• Steel and Composite Structures
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• 제35권1호
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• pp.43-59
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• 2020

In this study, free vibration analysis of laminated composite parabolic thick plate frames by using finite element method is introduced. Governing equations of an eigenvalue problem are obtained from First Order Shear Deformation Theory (FSDT). Finite element method is employed to obtain natural frequency values from the governing differential equations. The frames consist of two flat square plates and one singly curved plate. Parameters like radii of curvature, aspect ratio, ply orientation and boundary conditions are investigated to understand their effect on dynamic behavior of such a structure. In addition, multi-bay structures of such geometry with different stacking order are also taken into account. The composite frame structures are also modeled and simulated via ANSYS to verify the accuracy of the present study.

• Smart Structures and Systems
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• 제3권1호
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• pp.23-49
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• 2007

Wavelet transforms are the emerging signal-processing tools for damage identification and time-frequency localization. A small perturbation in a static or dynamic displacement profile could be captured using multi-resolution technique of wavelet analysis. The paper presents the wavelet analysis of damaged linear structural elements using DB4 or BIOR6.8 family of wavelets. Starting with a localized reduction of EI at the mid-span of a simply supported beam, damage modeling is done for a typical steel and reinforced concrete beam element. Rotation and curvature mode shapes are found to be the improved indicators of damage and when these are coupled with wavelet analysis, a clear picture of damage singularity emerges. In the steel beam, the damage is modeled as a rotational spring and for an RC section, moment curvature relationship is used to compute the effective EI. Wavelet analysis is performed for these damage models for displacement, rotation and curvature mode shapes as well as static deformation profiles. It is shown that all the damage indicators like displacement, slope and curvature are magnified under higher modes. A localization scheme with arbitrary location of curvature nodes within a pseudo span is developed for steady state dynamic loads, such that curvature response and damages are maximized and the scheme is numerically tested and proved.

• Computers and Concrete
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• 제4권3호
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• pp.167-186
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• 2007

Ductility based design of reinforced concrete structures implicitly assumes certain damage under the action of a design basis earthquake. The damage undergone by a structure needs to be quantified, so as to assess the post-seismic reparability and functionality of the structure. The paper presents an analytical method of quantification and location of seismic damage, through system identification methods. It may be noted that soft ground storied buildings are the major casualties in any earthquake and hence the example structure is a soft or weak first storied one, whose seismic response and temporal variation of damage are computed using a non-linear dynamic analysis program (IDARC) and compared with a normal structure. Time period based damage identification model is used and suitably calibrated with classic damage models. Regenerated stiffness of the three degrees of freedom model (for the three storied frame) is used to locate the damage, both on-line as well as after the seismic event. Multi resolution analysis using wavelets is also used for localized damage identification for soft storey columns.

• 한국콘텐츠학회논문지
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• 제10권4호
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• pp.340-347
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• 2010

대학은 교육 연구 시설과 장비 등 다양한 첨단시설이 집약되어 있는 공간이다. 이와 같은 물적 자원의 활용을 통해 학생들을 우수한 인재로 양성하고, 새로운 지식과 기술을 개발하는 공간이다. 대학의 물적 자원은 토지, 건물, 시설의 집합체로서 첨단장비와 노후시설 등이 혼재해 있으며, 연구시설에서는 신제품의 개발, 시험, 신기술 실험연구 등의 활동으로 연구인력 양성의 기능을 수행한다. 최근에는 교육 연구시설이 첨단화, 복잡화, 대형화 추세에 있어 인테리어 등 건축내장재, 기자재 등 가연물이 다양화되고 있으며, 연구실과 강의실 등 넓은 캠퍼스에 정원과 수목 등이 조성되어 있고, 많은 건축물에 교육 연구시설물과 기자재 등이 밀집되어 있다. 또한 교직원과 학생뿐만 아니라 불특정 다수인이 이용하는 다중이용공간으로서 전문적인 안전관리 시스템이 요구된다. 이러한 맥락에서, 본 연구는 우리나라 대학 캠퍼스의 안전을 확보하기 위한 전략으로서 CPTED(환경설계를 통한 범죄예방)을 중심으로 제시하였다. 이제 대학들은 학생들의 범죄피해를 해결하기 위해 적극적인 노력을 할 필요가 있다. 그 정책적 대안으로 캠퍼스 가로등의 조도를 높여야 한다. 이는 범죄에 대한 두려움을 줄일 수 있고, 또한 치한 등 여학생들을 괴롭히는 성범죄를 예방할 수 있는 가장 좋은 방법이 된다. 또한, 범죄의 사각지대와 다발지역을 파악하여 도보순찰을 실시해야 할 것이다. 아울러 대학 캠퍼스에서 각종 범죄예방을 위하여 활용할 수 있는 방안으로는 CCTV와 민간경비의 활용을 고려할 수 있다.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2010년 춘계학술발표회 논문집
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• pp.315-316
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• 2010

This study refer to make a selection of a location using multi-dimension spatial information for University's facilities management. Structures and new construction plane of the building for the simulation through the use of space to maximize the optimal location decisions. As a result, making a rational decision of facilities plan and management can be maximized.

• Journal of Microbiology and Biotechnology
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• 제28권8호
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• pp.1360-1366
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• 2018

The fungi associated with termites secrete enzymes such as laccase (multi-copper oxidase) that can degrade extracellular wood matrix. Laccase uses molecular oxygen as an electron acceptor to catalyze the degradation of organic compounds. Owing to its ability to transfer electrons from the cathodic electrode to molecular oxygen, laccase has the potential to be a biocatalyst on the surface of the cathodic electrode of a microbial fuel cell (MFC). In this study, a two-chamber MFC using the laccase-producing fungus Galactomyces reessii was investigated. The fungus cultured on coconut coir was placed in the cathode chamber, while an anaerobic microbial community was maintained in the anode chamber fed by industrial rubber wastewater and supplemented by sulfate and a pH buffer. The laccase-based biocathode MFC (lbMFC) produced the maximum open circuit voltage of 250 mV, output voltage of 145 mV (with a $1,000{\Omega}$ resistor), power density of $59mW/m^2$, and current density of $278mA/m^2$, and a 70% increase in half-cell potential. This study demonstrated the capability of laccase-producing yeast Galactomyces reessii as a biocatalyst on the cathode of the two-chamber lbMFC.