• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 춘계학술대회
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• pp.112-115
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• 2013

차량용 블랙박스는 음성과 영상 그리고 자동차의 다양한 정보를 저장하는 매체이며 이러한 정보를 바탕으로 사고의 재구성이 가능해 최근 자동차 시장에서 주목을 받고 있다. 또한 대중교통 중심으로 블랙박스의 장착이 확산되면서 수년 내에 시장은 더욱 커질 전망이다. 본 연구는 차량용 블랙박스 구매결정에 영향을 미치는 요인의 대한 선호도를 분석하였다. 블랙박스 구매결정 요인을 안전성, 기능성, 차별성, 경제성으로 구분하였다. 실증적 분석을 위해 블랙박스 관련회사 직원을 대상으로 설문조사를 실시하여 수집된 설문지를 분석하였다. 분석결과를 바탕으로 블랙박스 구매결정과 관련된 실무적 의의를 논의하였다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2007년도 정기 학술대회 논문집
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• pp.525-530
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• 2007

Although just developed in recent years, curved box girder has widely used in modern highway system due to their load resistance capacity as well as aesthetic considerations. According to recent literature reviews on curved box girder designs, distortional load was not considered as much as it deserves to be. In practice, the effect of distributional force is very small in straight bridge systems but yet unknown how it is in curved bridge systems. For the reason, this paper will show up an extensive parametric study on distortional behavior of curved box girder with trapezoidal section. Based on Dabrowski formulas, using finite element method, various bridges were investigated. In this study, following parameters will be included: span length, curvature radius, section height, section width, and internal section angle (web slope). From the obtained results, some initial geometric parameters are proposed for curved box girder bridges.

• Steel and Composite Structures
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• 제26권2호
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• pp.183-196
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• 2018

The traditional prestressed concrete composite box-girders with corrugated steel webs have several drawbacks such as large deflection and potential local buckling. In this study, two methods were investigated to optimize and improve the prestressed concrete composite box-girders with corrugated steel webs. The first method was to replace the concrete bottom slab with a steel plate and the second method was to support the concrete bottom slab on the steel flanges. The behavior of the prestressed concrete composite box-girders with corrugated steel webs with either method was studied by experiments on three specimens. The test results showed that behavior of the optimized and upgraded prestressed concrete composite box-girders with corrugated steel webs, including ultimate bearing capacity, flexural stiffness, and crack resistance, is greatly improved. In addition, the influence of different shear connectors, including perfobond leisten (PBL) and stud shear connectors, on the behavior of prestressed concrete composite box-girders with corrugated steel webs was studied. The results showed that PBL shear connectors can greatly improve the ultimate bearing capacity, flexural stiffness and crack resistance property of the prestressed concrete composite box-girders with corrugated steel webs. However, for the efficiency of prestressing introduced into the girder, the PBL shear connectors do not perform as well as the stud shear connectors.

• 상하수도학회지
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• 제31권6호
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• pp.619-628
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• 2017

As the 3D laser scanning technology capable of databaseing large sewage box culverts becomes possible, it is necessary to develop a standardization manual that can clearly distinguish the structural and operational defect types of box culver and analyze the defect data. In this study, we collected and analyzed defects in sewage box culverts of 14,827m in total by selecting three districts in Korea. The major defects were surface damages, and their defect densities were $2.17m^2/m$, $0.27m^2/m$ and $0.10m^2/m$ for aggregate exposure, Steel reinforcement exposure, and Steel reinforcement projecting. In order to support the decision of the box culverment management, it was divided into five grades and each defect code and defect score were allocated. The results of this study are useful for the diagnosis of the sewage box culverts in Korea and it is expected to support a decision making for management.

• 대한기계학회논문집A
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• 제36권10호
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• pp.1155-1162
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• 2012

알루미늄 크래쉬 박스는 저속충돌조건에서 프론트 사이드 멤버를 변형을 방지하기 위한 부품이다. 본 연구에서는 저속충돌조건에서 비드형상이 알루미늄 크래쉬 박스의 충돌성능에 미치는 영향을 분석하였다. Edge concave, surface convex 와 surface concave 타입의 비드형상들에 대한 충돌해석 및 실험을 수행하여 비드가 없는 normal 타입의 알루미늄 크래쉬 박스의 충돌성능과 비교분석하였다. 충돌성능은 저속충돌조건에서 크래쉬 박스의 초기 최대하중 및 충돌에너지 흡수능으로 평가하였다. 이를 검증하기 위해 알루미늄 크래쉬 박스와 결합된 프론트 사이드 멤버에 대해 저속충돌실험 수행하고, 이를 분석하였다. Surface concave 타입의 비드가 삽입된 알루미늄 크래쉬 박스 경우, 프론트 사이드 멤버의 변형을 방지할 수 있음을 확인하였다.

• 한국정보통신학회논문지
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• 제23권7호
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• pp.875-880
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• 2019

RC4 스트림 암호화는 내부 구현이 간단하고 빠르게 암호화 할 수 있는 초경량 암호화 알고리즘으로 IEEE 802.11의 WEP와 IEEE 802.11i의 TKIP 등에 널리 이용되고 있다. RC4는 IoT 등의 제한적 자원을 갖는 시스템들에도 사용되지만 성능상 제약이 있다. RC4 암호화는 S-배열과 K-배열의 초기화 및 랜덤화를 수행하는 KSA(Key Scheduling Algorithm)와 랜덤화된 S-배열을 이용하여 암호문을 생성하는 PRGA(Pseudo-Random Generation Algorithm)의 두 단계로 구성된다. 본 논문에서는 KSA에서 발생하는 초기화 지연시간을 줄이기 위해, 랜덤화 과정에 초기화를 삽입하여 함께 처리한다. KSA의 랜덤화에서 교환(swap) 작업과 PRGA의 암호문 생성은 클러스터를 이용하여 매 클록마다 두 개의 교환 및 암호문이 생성되도록 하였다. 제안된 RC4 암호화 하드웨어 구조는 초기화 지연시간이 발생하지 않으며, 랜덤화와 키 스트림 생성율에서 다른 연구들과 비교하여 약 2배에서 6배의 성능이 향상되었다.

• Animal cells and systems
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• 제16권4호
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• pp.280-288
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• 2012

Targeted degradation of proteins through ubiquitin-mediated proteolysis is an important control mechanism in various cellular processes. The process of ubiquitin conjugation is achieved by three enzyme complexes, among which the ubiquitin ligase complex (E3) is in charge of substrate specificity. The SCF (SKP1-CUL1-F-box) family portrays the largest and the most characterized member of the E3 ligases. For each SCF complex, the ubiquitination target is recognized by the F-box protein subunit, which interacts with the substrate through a unique C-terminal domain. We have characterized a novel F-box protein CFL-1 that represents a single LRR-type F-box (FBXL) in the Caenorhabditis elegans genome. CFL-1 is highly homologous to FBXL20 and FBXL2 of mammals, which are known to regulate synaptic vesicle release and cell cycle, respectively. A green fluorescence protein (GFP)-reporter gene fused to the cfl-1 promoter showed restricted expression around the amphid and the anus. Modulation of CFL-1 activity by RNAi affected the time interval between defecations. RNAi-treated worms also exhibited reduced tendency to form dauer when exposed to daumone. The potential involvement of CFL-1 in the control of defecation and pheromone response adds to the ever expanding list of cellular processes controlled by ubiquitin-mediated proteolysis in C. elegans. We suggest that CFL-1, as a single LRR-type F-box protein in C. elegans, may portray a prototype gene exerting diverse functions that are allocated among multiple FBXLs in higher organisms.

• 한국포장학회지
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• 제4권2호
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• pp.12-17
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• 1998

개발한 EPS 포장상자가 농산물의 신선도 유지효과 기능이 있는지의 여부를 분석코자 배를 포장하여 $20^{\circ}C$에 저장하면서 골판지상자와 0.02와 0.04mm 두께의 LDPE필름으로 포장한 것들과 신선도 유지효과를 비교하였다. 저장 50일 후 중량 감소는 대조구는 4.4%, EPS 상자는 0.7%의 중량감소가 나타났고, 비타민C도 2.12와 2.63 mg%로 EPS 포장구가 20% 높게 유지되고 있었다. 당도와 산도는 포장구간에 큰 차이가 있었으며 부패는 대조구는 상자당 1-2개과가 발생했으나 EPS 포장구는 발생하지 않아 개발한 EPS 포장구를 신선도 유지를 위한 유통용 상자로 활용가능성이 확인되었다.

• Structural Engineering and Mechanics
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• 제28권4호
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• pp.387-410
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• 2008

The fatigue damage accumulation rates of horizontally curved thin walled box-girder bridge have been estimated from vehicle-induced dynamic stress history using rain flow cycle counting method in the time domain approach. The curved box-girder bridge has been numerically modeled using computationally efficient thin walled box-beam finite elements, which take into account the important structural actions like torsional warping, distortion and distortional warping in addition to the conventional displacement and rotational degrees of freedom. Vehicle model includes heave-pitch-roll degrees of freedom with longitudinal and transverse input to the wheels. The bridge deck unevenness, which is taken as inputs to the vehicle wheels, has been assumed to be a realization of homogeneous random process specified by a power spectral density (PSD) function. The linear damage accumulation theory has been applied to calculate fatigue life. The fatigue life estimated by cycle counting method in time domain has been compared with those found by estimating the PSD of response in frequency domain. The frequency domain method uses an analytical expression involving spectral moment characteristics of stress process. The effects of some of the important parameters on fatigue life of the curved box bridge have been studied.

• BMB Reports
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• 제41권2호
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• pp.132-138
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• 2008

AtbZIP16 and AtbZIP68 are two putative G group bZIP transcription factors in Arabidopsis thaliana, the other three members of G group bZIPs are GBF1-3 which can bind G-box. Members of G group have conservative protein structure: highly homological basic region and a proline-rich domain in the N-terminal region. Here, we report that AtbZIP16 and AtbZIP68 could bind cis elements with ACGT core, such as G-box, Hex, C-box and As-1, but with different binding affinities which from high to low were G-box > Hex > C-box > As-1; AtbZIP16 and AtbZIP68 could form homodimer and form heterodimer with other members of G group; N-terminal proline rich domain of AtbZIP16 had transactivation activity in yeast cells while that of AtbZIP68 did not; AtbZIP16 and AtbZIP68 GFP fusion protein localized in the nucleus of onion epidermal cells. These results indicated that AtbZIP16 and AtbZIP68 were two new members of GBFs. In Arabidopsis, AtbZIP16 and AtbZIP68 may also participate in light-responsive process in which GBF1-3 are involved.