• 서비스연구
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• 제6권2호
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• pp.37-49
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• 2016

모바일 기기의 급속한 확장은 모바일 애플리케이션 프로그램(앱) 시장의 폭발적인 성장을 가져왔다. 하지만 PC 소프트웨어, 동영상, 음원, 등 다른 디지털 컨텐츠와 마찬가지로 모바일 앱의 불법적인 유통이 보편적으로 이루어지고 있다. 본 연구에서는 모바일 앱 불법복제 행동 유발요인을 이해하기 위해서 행위의도에 미치는 요인에 대하여 분석하였다. 본 연구에서는 선행연구 분석을 바탕으로 계획된 행동이론 모형에 목적론적 요인과 과거행동 및 습관 요인을 추가하여 연구모형을 제시하고 수도권 대학생을 대상으로 실증하였다. 주관적 규범을 제외한 태도와 지각된 행동통제력은 행동의도에 영향을 미치는 것으로 나타났다. 과거 PC 소프트웨어 불법복제 경험은 스마트폰 앱 불법복제에 대한 태도, 지각된 행동통제력과 습관에 유의한 영향을 미쳤으며 습관은 행동의도의 중요한 예측변수로 나타났다. 지각된 이익은 태도에 영향을 미쳤으나 법적, 기술적 위험의 영향력은 유의하지 않은 것으로 확인되었다.

• Earthquakes and Structures
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• 제18권5호
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• pp.527-542
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• 2020

In traditional eccentrically braced steel frames, damages and plastic deformations are limited to the links and the main structure members are required tremendous sizes to ensure elasticity with no damage based on the force-based seismic design method, this limits the practical application of the structure. The high strength steel frames with eccentric braces refer to Q345 (the nominal yield strength is 345 MPa) steel used for links, and Q460 steel utilized for columns and beams in the eccentrically brace steel frames, the application of high strength steels not only brings out better economy and higher strength, but also wider application prospects in seismic fortification zone. Here, the structures with four type eccentric braces are chosen, including K-type, Y-type, D-type and V-type. These four types EBFs have various performances, such as stiffness, bearing capacity, ductility and failure mode. To evaluate the seismic behavior of the high strength steel frames with variable eccentric braces within the similar performance objectives, four types EBFs with 4-storey, 8-storey, 12-storey and 16-storey were designed by performance-based seismic design method. The nonlinear static behavior by pushover analysis and dynamic performance by time history analysis in the SAP2000 software was applied. A total of 11 ground motion records are adopted in the time history analysis. Ground motions representing three seismic hazards: first, elastic behavior in low earthquake hazard level for immediate occupancy, second, inelastic behavior of links in moderate earthquake hazard level for rapid repair, and third, inelastic behavior of the whole structure in very high earthquake hazard level for collapse prevention. The analyses results indicated that all structures have similar failure mode and seismic performance.

• Steel and Composite Structures
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• 제23권6호
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• pp.727-736
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• 2017

The application of carbon fiber reinforced polymer (CFRP) in steel structures primarily includes two categories, i.e., the bond-critical application and the contact-critical application. Debonding failure and buckling failure are the main failure modes for these two applications. Conventional electrometric techniques may not provide precise results because of the limitations associated with single-point contact measurements. A nondestructive full-field measurement technique is a valuable alternative to conventional methods. In this study, the digital image correlation (DIC) technique was adopted to investigate the bond behavior and buckling behavior of CFRP-steel composite members. The CFRP-to-steel bonded joint and the CFRP-strengthened square hollow section (SHS) steel column were tested to verify the suitability of the DIC technique. The stereo-DIC technique was utilized to measure continuous deformation. The bond-slip relationship of the CFRP-to-steel interface was derived using the DIC data. Additionally, a multi-camera DIC system consisting of four stereo-DIC subsystems was proposed and applied to the compressive test of CFRP-strengthened SHS steel column. The precise buckling location and CFRP delamination of the CFRP-strengthened SHS steel column were identified. The experimental results confirm that the stereo-DIC technique can provide effective measurements for investigating the behaviors of CFRP-steel composite members.

• 융합보안논문지
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• 제22권2호
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• pp.3-8
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• 2022

보안 위협은 외부에서 발생하기도 하지만 내부에서 발생하는 비율이 더 높다. 특히 내부 사용자는 정보 서비스에 대한 정보를 인지하고 있기에 보안 위협에 의한 피해는 더욱 커진다. 이러한 환경에서 중요 정보 서비스에 접근하는 모든 사용자의 행위는 실시간으로 모니터링되고 기록되어야 한다. 그러나 현재 운영체제는 시스템과 Application 실행에 대한 로그만을 기록하고 있어, 사용자의 행위를 실시간으로 모니터링하기에는 한계가 있다. 이러한 보안 환경에서는 사용자의 비인가 행위로 인한 피해가 발생할 수 있다. 본 연구는 이러한 문제점을 해결하기 위하여, Linux 환경에서 사용자의 행위를 실시간으로 모니터링하는 아키텍처를 제안한다. 제안하는 아키텍처의 실효성을 확인하기 위하여 기능을 검증한 결과, 운영체제에 접근한 모든 사용자의 console 입력값과 출력값을 모두 실시간으로 모니터링하고 이를 저장한다. 제안한 아키텍처의 성능은 운영체제에서 제공하는 식별 및 인증 기능보다는 다소 늦지만, 사용자가 인지할 수준은 아닌 것으로 확인되어, 충분히 실효적이라고 판단되었다.

• International Journal of Concrete Structures and Materials
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• 제10권2호
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• pp.125-142
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• 2016

An overall review of the structural behaviors of ultra-high-performance fiber-reinforced concrete (UHPFRC) elements subjected to various loading conditions needs to be conducted to prevent duplicate research and to promote its practical applications. Thus, in this study, the behavior of various UHPFRC structures under different loading conditions, such as flexure, shear, torsion, and high-rate loads (impacts and blasts), were synthetically reviewed. In addition, the bond performance between UHPFRC and reinforcements, which is fundamental information for the structural performance of reinforced concrete structures, was investigated. The most widely used international recommendations for structural design with UHPFRC throughout the world (AFGC-SETRA and JSCE) were specifically introduced in terms of material models and flexural and shear design. Lastly, examples of practical applications of UHPFRC for both architectural and civil structures were examined.

• 한국컴퓨터정보학회논문지
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• 제22권8호
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• pp.33-39
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• 2017

In this paper, we propose a method which implements warning to drivers through real-time analysis of risky and unexpected driver and vehicle behavior using only a smartphone without using data from digital tachograph and vehicle internal sensors. We performed the evaluation of our system that demonstrates the effectiveness and usefulness of our method for risky and unexpected driver and vehicle behavior using three information such as vehicle speed, azimuth and GPS data which are acquired from a smartphone sensors. We confirmed the results and developed the smartphone application for validate and conducted simulation using actual driving data. This novel functionality of the smartphone application enhances drivers' situational awareness, increasing safety and effectiveness of driving.

• Journal of the Korean Wood Science and Technology
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• 제23권3호
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• pp.8-15
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• 1995

This analytical study was carried out to make quality and productivity up in designing the frame-type furniture with semi-rigid joint by understanding the mechanical and structural behavior of the joint and by evaluating the validity of application of the time-saving Finite Element Method to its structural analysis. Slope deflection equation for rigid joint was modified to describe the moment-rotation behavior of semi-rigid joint and the joint stiffness factor(Z) could be calculated to lessen the experimental expense. It was proved that Finite Element Analysis with imaginary elements having equivalent MOE to the semi-rigid joint could be the alternative method for the structural analysis of the frame-type furniture, comparing the internal rotation of the 2-dimensional beam-to-column model with two-pin(wooden dowel) from the finite element method with other available theoretical and experimental rotation value.

• Tribology and Lubricants
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• 제24권6호
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• pp.386-392
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• 2008

Friction and wear behavior of hard coated and surface treated steel with candidate processing methods for low velocity high pressure application investigated. Wear tests were carried out under specific region considering the operation condition of construction equipments under lubricated and unlubricated condition. Different tribological behavior analyzed with comparing the wear rate of counter part, morphology and topography of worn surface and the worn volume of samples and counter parts.

• 한국표면공학회지
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• 제55권5호
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• pp.292-298
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• 2022

In this study, PEO (plasma electrolytic oxidation) film formation behavior of AZ31 Mg alloy under application of 300 Hz pulse current was studied by the analyses of V-t curve, arc generation behavior, PEO film thickness and morphology of PEO films with treatment time in 0.05 M NaOH + 0.05 M Na₂SiO₃ + 0.1 M NaF solution. PEO films was observed to grow after 10 s of application of pulse current together with generation of micro-arcs. PEO film grew linearly with treatment time at a growth rate of about 5.58 ㎛/min at 200 mA/cm² of pulse current but increasing rate of film formation voltage became lowered largely with increasing treatment time after passing about 250 V, suggesting that resistivity of PEO films during micro-arc generation decreases with increasing film formation voltage at more than 250 V.

• Nuclear Engineering and Technology
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• 제54권12호
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• pp.4393-4411
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• 2022

In recent years, beryllium oxide has been widely utilized in multiple compact nuclear reactors as the neutron moderator, the neutron reflector or the matrix material with dispersed nuclear fuels due to its prominent properties. In the past 70 years, beryllium oxide has been studied extensively, but rarely been systematically organized. This article provides a systematic review of the application history, thermal properties, mechanical properties, corrosion behavior and fabrication methods of beryllium oxide. Data from previous literature are extracted and sorted out, and all of these original data are attached as the supplementary material, so that subsequent researchers can utilize this paper as a database for beryllium oxide research in reactor design or simulation analysis, etc. In addition, this review article also attempts to point out the insufficiency of research on beryllium oxide, and the possible key research areas about beryllium oxide in the future.