• Steel and Composite Structures
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• 제32권6호
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• pp.807-819
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• 2019

In recent earthquakes, the failure of ceiling systems has been one of the most widely reported damage and the major cause of functionality interruption in some buildings. In an effort to mitigate this damage, some scholars have studied a series of ceiling systems including plaster ceilings and mineral wool ceilings. But few studies have involved the backdrop metal ceiling used in some important constructions with higher rigidity and frequency such as the main control area of nuclear power plants. Therefore, in order to evaluate its seismic performance, a full-scale backdrop metal ceiling system, including steel runners and metal panels, was designed, fabricated and installed in a steel frame in this study. And the backdrop metal ceiling system with two perimeter attachments variants was tested: (i) the ends of the runners were connected with the angle steel to form an effective lateral constraint around the backdrop metal ceiling, (ii) the perimeter attachments of the main runner were retained, but the perimeter attachments of the cross runner were removed. In the experiments, different damage of the backdrop metal ceiling system was observed in detail under various earthquakes. Results showed that the backdrop metal ceiling had good integrity and excellent seismic performance. And the perimeter attachments of the cross runner had an adverse effect on the seismic performance of the backdrop metal ceiling under earthquakes. Meanwhile, a series of seismic construction measures and several suggestions that need to be paid attention were proposed in the text so that the backdrop metal ceiling can be better applied in the main control area of nuclear power plants and other important engineering projects.

• 한국철학논집
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• 제50호
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• pp.333-361
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• 2016

본 연구는 전통의 규범적 의미에 대한 재해석과 범주화의 탐구를 목적으로 한다. 행위의 규정 근거로서 전통은 규범적 의미를 지니며, 도덕의 중요한 원천이다. 통시적 맥락에서 볼 때, 생태문화적 관점에서 고찰할 때, 전통적 가치는 그 연원이 있고, 시대적 사회적 변화에 따른 변용과 왜곡의 모습을 지니기도 한다. 전통적 가치가 민주시민으로서 미래 사회를 대비하는 데 기여하기 위해서는 재해석과 범주화가 필요하다. 미래 한국사회의 변화 전망 속에 유효한 전통의 규범적 의미는 그 연원으로부터 재해석을 통해 도출될 수 있다. 본고의 논의 순서는 다음과 같다. 먼저 생태문화적 관점에서 전통적 가치의 동적인 변화상을 살펴보고, 한국사회에서 전통적 가치에 대한 사회적 인식을 바탕으로 대표적인 전통적 가치인 충효의 현대적 재해석의 가능성을 탐색하고자 한다. 끝으로 서구적 가치와 한국의 전통적 가치를 포괄하는 한국적 가치의 맥락 속에서 전통적 가치의 범주화와 그 함의를 밝히고자 한다.

• 디지털융복합연구
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• 제19권11호
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• pp.457-462
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• 2021

본 연구는 VR 게임에서 시각적 몰입감을 향상할 수 있는 제작 기법에 관한 연구이다. 먼저, 선행연구를 통해 VR 게임과 현황, 시각 및 몰입감에 관한 이론을 검토하고, 표본을 정하여 VR 게임에서 시각적 몰입을 향상할 수 있는 주요 구성 요소들을 추출하였다. 그리고 현재 전 세계 팬데믹 현상인 코로나19(COVID-19)의 콘셉트를 적용하여 VR 게임을 제작하고 개발하였다. 그 결과, 기술적 구성 요소의 해상도, 프레임 레이트, 시야각, 조명의 밝기, 디자인 품질과 내용적 구성 요소의 스토리텔링, 배경, 연출, 색상과 질감, 흥미와 재미를 통해 VR 게임을 플레이하는 과정에서 시각적 몰입을 유도하고 향상할 수 있는 유의미한 결과를 얻었으며, 최종적으로 원활한 게임 플레이를 구현할 수 있었다. 본 연구 과정 및 결과를 통해 향후 사용자의 시각적 몰입을 유도하고 향상할 수 있는 VR 게임의 제작과 개발 분야에 기초 자료가 될 것으로 기대한다.

• Steel and Composite Structures
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• 제46권4호
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• pp.497-512
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• 2023

Using light weight concrete as infill material in conventional cold-formed steel (CFS) shear wall systems can considerably increase their load bearing capacity, ductility, integrity and fire resistance. The compressive strength of the filler concrete is a key factor affecting the structural behaviour of the composite wall systems, and therefore, achieving maximum compressive strength in lightweight concrete while maintaining its lightweight properties is of significant importance. In this study a new type of optimum polystyrene lightweight concrete (OPLC) with high compressive strength is developed for infill material in composite CFS shear wall systems. To study the seismic behaviour of the OPLC-filled CFS shear wall systems, two full scale wall specimens are tested under cyclic loading condition. The effects of OPLC on load-bearing capacity, failure mode, ductility, energy dissipation capacity, and stiffness degradation of the walls are investigated. It is shown that the use of OPLC as infill in CFS shear walls can considerably improve their seismic performance by: (i) preventing the premature buckling of the stud members, and (ii) changing the dominant failure mode from brittle to ductile thanks to the bond-slip behaviour between OPLC and CFS studs. It is also shown that the design equations proposed by EC8 and ACI 318-14 standards overestimate the shear force capacity of OPLC-filled CFS shear wall systems by up to 80%. This shows it is necessary to propose methods with higher efficiency to predict the capacity of these systems for practical applications.

• 한국산업정보학회논문지
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• 제14권5호
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• pp.139-148
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• 2009

본 논문에서는 단일 카메라로부터 입력된 2차원 측면 골프 스윙 비디오 영상으로부터 사람의 개입 없이 스윙을 자동으로 분석하는 방법을 제안하였다. 2차원 환경에서 스윙 자동분석에 필요한 특징들을 정의 및 추출하고, 에지 검출과 직선 추출을 비롯한 다양한 영상처리 기법을 이용하여 자동 스윙 분석 방법을 제시 하였다. 기존 스윙분석 시스템이나 관련 연구들과 비교하여 제안한 방법은 다음과 같은 두 가지 특징을 갖는다. 첫째, 기존의 스윙 자동분석이 상대적으로 복잡하고 고가인 3차원 환경에서만 가능하였지만 제안한 방법은 2차원 환경에 서도 가능하다. 둘째, 기존의 2차원 스윙분석 시스템들은 골프 전문가에 의한 분석이 필요하지만 제안한 방법은 사람의 개입 없이 자동적으로 이루어지므로 사용이 편리하다. 제안한 스윙특징 추출 및 분석 방법을 20장의 스윙영상에 대하여 실험한 결과, 제안한 방법이 스윙 특징 추출 및 분석에 유용함을 확인하였다.

• 한국해양생명과학회지
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• 제1권2호
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• pp.88-94
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• 2016

Determining the infection history of living organisms is essential for understanding the evolution of infection agents with their host, particularly for key aspects such as immunity. Viruses, which can spread between individuals and often cause disease, have been widely examined. The increasing availability of fish genome sequences has provided specific insights into the diversity and host distribution of retroviruses in fish. The shortspine spurdog (Squalus mitsukurii) is an important elasmobranch species; this medium-sized dogfish typically lives at depths of 100~500 m. However, the retroviral envelope polyprotein in dogfish has not been examined. Thus, the aim of the present study was to identify and analyze the retroviral envelope polyprotein in various tissues of dogfish. The 1334-base pair full-length novel cDNA of dogfish envelope polyprotein (dEnv) was obtained by 3' and 5'-rapid amplification of cDNA end analysis from S. mitsukurii. The open reading frame showed a complete coding sequence of 815 base pairs with a deduced peptide sequence of 183 amino acids that exhibited 34~50% identity with other fish and bird species. It was also expressed according to reverse transcription and real-time polymerase chain reaction in the kidney, liver, intestine, and lung, but not in the gill. This distribution can be assessed by identifying and analyzing endogenous retroviruses in fish, which consists of three main genes: gag, pol and env. Dogfish envelope polyprotein sequence is likely important in evolution and induces rearrangements, altering the regulatory and coding sequences. This is the first report of the identification and molecular characterization of retroviral envelope polyprotein in various tissues of S. mitsukurii.

• ALGAE
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• 제38권1호
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• pp.1-22
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• 2023

An enormous body of research is focused on finding ways to commercialize carotenoids produced by the unicellular green alga, Haematococcus, often without the benefit of a sound phylogenetic assessment. Evidence of cryptic diversity in the genus means that comparing results of pigment studies may be confounded by the absence of a phylogenetic framework. Moreover, previous work has identified unnamed strains that are likely candidates for species status. We reconstructed the phylogeny of an expanded sampling of Haematococcus isolates utilizing data from nuclear ribosomal markers (18S rRNA gene, 26S rRNA gene, internal transcribed spacer [ITS]-1, 5.8S rRNA gene, and ITS-2) and the rbcL gene. In addition, we gathered morphological, ultrastructural and pigment data from key isolates of Haematococcus. Our expanded data and taxon sampling support the concept of a new species, H. privus, found exclusively in North America. Despite overlap in numerous morphological traits, results indicate that ratios of protoplast length to width and akinete diameter may be useful for discriminating Haematococcus lineages. High growth rate and robust astaxanthin yield indicate that H. rubicundus (SAG 34-1c) is worthy of additional scrutiny as a pigment source. With the description of H. privus, the evidence supports the existence of at least five, species-level lineages in the genus. Our phylogenetic assessment provides the tools to frame future pigment investigations of Haematococcus in an updated evolutionary context. In addition, our investigation highlighted open questions regarding polyploidy and sexuality in Haematococcus which demonstrate that much remains to be discovered about this green flagellate.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.339-343
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• 2015

To rapidly recover ceased functionality of a facility after a catastrophic seismic event, critical decisions on facility repair works are made within a limited period of time. However, prolonged damage assessment of facilities, due to massive damage in the surrounding region and the complicated damage judgment procedures, may impede restoration planning. To assist reliable structural damage estimation without a deep knowledge and rapid interactive analysis among facility damage and restoration operations during the approximate restoration project planning phase, we developed a prototype of distributed facility restoration simulations through the use of high-level architecture (HLA) (IEEE 1516). The simulation prototype, in which three different simulations (including a seismic data retrieval technique, a structural response simulator, and a restoration simulation module) interact with each other, enables immediate damage estimation by promptly detecting earthquake intensity and the restoration operation analysis according to estimated damage. By conducting case simulations and experiments, research outcomes provide key insights into post-disaster restoration planning, including the extent to which facility damage varies according to disaster severity, facility location, and structures. Additional insights arise regarding the extent to which different facility damage patterns impact a project's performance, especially when facility damage is hard to estimate by observation. In particular, an understanding of required type and amount of repair activities (e.g., demolition works, structural reinforcement, frame installation, or finishing works) is expected to support project managers in approximate work scheduling or resource procurement plans.

• Journal of Animal Science and Technology
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• 제65권4호
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• pp.698-719
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• 2023

Postweaning multisystemic wasting syndrome (PMWS) is caused by a systemic inflammation after porcine circovirus type 2 (PCV2) infection. It was one of the most economically important pathogens affecting pig production worldwide before PCV2 vaccine was first introduced in 2006. After the development of a vaccine against PCV2a type, pig farms gradually restored enormous economic losses from PMWS. However, vaccine against PCV2a type could not be fully effective against several different PCV2 genotypes (PCV2b - PCV2h). In addition, PCV2a vaccine itself could generate antigenic drift of PCV2 capsid. Therefore, PCV2 infection still threats pig industry worldwide. PCV2 infection was initially found in local tissues including reproductive, respiratory, and digestive tracks. However, PCV2 infection often leads to a systemic inflammation which can cause severe immunosuppression by depleting peripheral lymphocytes in secondary lymphoid tissues. Subsequently, a secondary infection with other microorganisms can cause PMWS. Eleven putative open reading frames (ORFs) have been predicted to encode PCV2 genome. Among them, gene products of six ORFs from ORF1 to ORF6 have been identified and characterized to estimate its functional role during PCV2 infection. Acquiring knowledge about the specific interaction between each PCV2 ORF protein and host protein might be a key to develop preventive or therapeutic tools to control PCV2 infection. In this article, we reviewed current understanding of how each ORF of PCV2 manipulates host cell signaling related to immune suppression caused by PCV2.

• 한국심리학회지 : 문화 및 사회문제
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• 제13권3호
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• pp.65-87
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• 2007

본 연구에서는 고령화 사회의 주요문제로 부각되고 있는 노인문제와 나이듦에 대한 이해의 틀을 마련하고자 성공적 노화의 통합적 개념화를 시도하였다. 이를 위해, 나이듦의 의미를 규명하고, 나이듦과 관련된 부정적 변화와 나이듦에 따른 성장과 발달 등 긍정적 변화를 구분하여 개관하였다. 특히, 긍정적 변화와 관련하여 지혜가 성공적 노화의 중요한 요인이 될 수 있음을 확인하였다. 기존의 성공적 노화 이론과 주요 연구 결과들을 제시하였고, 기존의 이론이 가지고 있는 한계에 대한 논의를 바탕으로 지혜를 포함하는 성공적 노화의 통합적 개념화를 제시하였다. 성공적 노화의 통합적 개념화의 주요내용 및 특징을 설명하고 성공적 노화의 통합적 개념화가 갖는 시사점에 대해 논의하였다.