• 한국전문물리치료학회지
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• 제11권4호
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• pp.7-17
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• 2004

Individuals who propel wheelchairs have a high prevalence of upper extremity injuries (i.e., carpal tunnel syndrome, elbow/shoulder tendonitis, impingement syndrome). Musculoskeletal injuries can result from overuse or incorrect use of manual wheelchairs, and can hinder rehabilitation efforts. To better understand the mechanisms of upper extremity injuries, this study investigates the motion of the wrist during wheelchair propulsion. This study also examines changes in the variables that occur with fatiguing wheelchair propulsion to determine how the time parameters of wheelchair propulsion and the state of fatigue influence the risk of injury. A two dimensional (2-D) analysis of wrist movement during the wheelchair stroke was performed. Twenty subjects propelled a wheelchair handrim on a motor-driven treadmill at two different velocities (50, 70 m/min). The results of this study were as follows; The difference in time parameters of wheelchair propulsion (cadence, cycle time, push time, recovery time, and PSP ratio) at two different velocities was statistically significant. The wrist kinematic characteristics had statistically significant differences at two different velocities, but wrist radial deviation and elbow flexion/extension had no statistically significant differences. There were statistically significant differences in relation to fatigue in the time parameter of wheelchair propulsion (70 m/min) between initial 1 minute and final 1 minute. The wrist kinematic characteristics between the initial 1 minute and final 1 minute in relation to fatigue had statistically significant differences but the wrist flexion-extension (50 m/min) had no statistically significant differences. According to the results, the risk of musculoskeletal injuries is increased by fatigue from wheelchair propulsion. To prevent musculoskeletal injuries, wheelchair users should train in a muscle endurance program and consider wearing a splinting/grove. Moreover, wheelchair users need education on propulsion posture, suitable joint position, and proper recovery patterns of propulsion.

• 대한치과기공학회지
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• 제35권1호
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• pp.19-27
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• 2013

Purpose: The aim of this research was to evaluate the shear bond strength of different zirconia veneering ceramics with and without liner glass materials to yttria partially-stabilized tetragonal zirconia polycrystalline(Y-TZP). Methods: Five co mmercial zirconia veneering ceramics were used in this study, E-Max(EM), Creation ZI(CR), Cercon ceram kiss(CE), Triceram(TR) and Zirkonzahn ICE(ZI). All samples were prepared according to manufacturer's instructions. Experimental industrially manufactured Y-TZP ceramic blocks(diameter: 2.7 mm; height: 13.5 mm) were used in this study. Shear bond strength between zirconia ceramic coping and zirconia veneering ceramics were evaluated by the push-shear bond test. The fracture load data were analyzed using ANOVA and Scheffe's test(${\alpha}$=0.05). The fractured surfaces of zirconia core ceraimc and zirconia veneering ceramics were observed using a scanning electron microscope(SEM). Results: The mean shear bond strengths ranged from 20 MPa ($20.12{\pm}6.34$ MPa) to 66.6 MPa ($66.62{\pm}10.01$ MPa). The Triceram(TRG) showed the highest value and Creation ZI(CR) showed the lowest value. In all groups, Zirconia liner and glass material groups was significantly higher shear bond strength than without liner(P<0.05), with the exception of Cercon ceram kiss(CE)groups. Conclusion: Zirconia bonding materials may have the advantage of improved bond strength between zirconia ceramic core and veneering ceramics.

• 한국자동차공학회논문집
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• 제18권1호
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• pp.86-92
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• 2010

The fuel is not injected when the driver doesn't push acceleration pedal of a vehicle with engine speed higher than about 1,500rpm above mid vehicle speed range. This is called "fuel-cut function" and almost every modern vehicle is equipped with this function. This is activated on downhill part of a highway most often. Therefore the vehicle-exhausted $CO_2$ can be zero in this downhill part if the driver could recognize this part of highway. We compared the vehicle-exhausted $CO_2$ emission when using fuel-cut function with the $CO_2$ mass when without using this function in this study. We found that the $CO_2$ emission reduced with fuel-cut function and measured the reduction rate of vehicle-exhausted $CO_2$ mass with this test results. The exhausted $CO_2$ mass of a passenger car(2,000cc engine volume) is reduced by 4% with this function used. This $CO_2$ reduction effect can be achieved if the downhill part of a highway is painted with a specific color. And this road painting can be included in the highway road rehabilitation policy.

• Asian Pacific Journal of Cancer Prevention
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• 제15권23호
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• pp.10355-10361
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• 2015

Background: MicroRNAs (miRNAs) are small non-coding RNA molecules found in multicellular eukaryotes which are implicated in development of cancer, including cutaneous squamous cell carcinoma (cSCC). Expression is controlled by transcription factors (TFs) that bind to specific DNA sequences, thereby controlling the flow (or transcription) of genetic information from DNA to messenger RNA. Interactions result in biological signal control networks. Materials and Methods: Molecular components involved in cSCC were here assembled at abnormally expressed, related and global levels. Networks at these three levels were constructed with corresponding biological factors in term of interactions between miRNAs and target genes, TFs and miRNAs, and host genes and miRNAs. Up/down regulation or mutation of the factors were considered in the context of the regulation and significant patterns were extracted. Results: Participants of the networks were evaluated based on their expression and regulation of other factors. Sub-networks with two core TFs, TP53 and EIF2C2, as the centers are identified. These share self-adapt feedback regulation in which a mutual restraint exists. Up or down regulation of certain genes and miRNAs are discussed. Some, for example the expression of MMP13, were in line with expectation while others, including FGFR3, need further investigation of their unexpected behavior. Conclusions: The present research suggests that dozens of components, miRNAs, TFs, target genes and host genes included, unite as networks through their regulation to function systematically in human cSCC. Networks built under the currently available sources provide critical signal controlling pathways and frequent patterns. Inappropriate controlling signal flow from abnormal expression of key TFs may push the system into an incontrollable situation and therefore contributes to cSCC development.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2018년도 춘계학술대회
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• pp.657-659
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• 2018

실생활에서, 우리는 IoT기술을 사용하고 있다. IoT기술은 다양하게 적용되어있고 지금도 계속 발전하고 있다. 사물인터넷은 사물에 센서를 부착하고 실시간으로 데이터를 인터넷으로 주고받는 기술이나 환경을 일컫는다. 본 논문에서는 비밀번호가 3회 이상 틀릴 시에 기존 비밀번호는 초기화 되고 랜덤으로 비밀번호가 변경된다. 변경된 비밀번호 데이터는 사용자 혹은 관리자에게 앱을 통하여 푸쉬알람이 전송됨을 실현하고자 한다. 이는 WiFi를 통해 스마트 폰으로 실시간 데이터를 전송할 수 있는 아두이노 기반의 IoT시스템을 연구하였다. 그리고 스마트 도어락은 아두이노와 지문센서, 카메라 센서, 와이파이 쉴드, 안드로이드 스튜디오, 도어락 부품들을 사용하여 이를 구현하고자 한다.

• 기술혁신학회지
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• 제11권2호
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• pp.171-193
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• 2008

21세기를 맞이하여 세계 각국은 자국의 지식재산권을 보호하기 위한 정책을 추진하고 있으며, 이와 같은 지식재산권을 보호강화하기 위한 국제적 동향은 더욱 더 강력해지고 있다. 이러한 환경에서 기업은 사활을 걸고 기술보호와 경영을 어떻게 할 것인가에 대한 최적인 방법을 모색하여야 하며, 기업의 지식재산관리는 관리적인 차원이 아닌 경영적인 차원에서 고려되어야 한다. 즉, 기업은 산업재산권을 경영자원의 하나로서 전환하여야 하며 그 중요성은 기업의 생존에도 큰 영향을 미친다. 특허 데이터는 기업 전략 수립의 중요한 정보이다. 이 연구에서는 우리나라 금속기업 27개사를 대상으로 특허활동을 체계적으로 분석하였다. 2000년부터 2005년까지의 특허데이터를 이용하여 특허경영과 기업경영성과와의 관계를 분석하였다. 이 연구의 주요 결과로는, 노동생산성은 종업원 1인당 특허활동도와 유의한 양(+)의 관계가 있는 것으로 나타났지만, 기업규모와는 유의한 음(-)의 관계가 있는 것으로 나타났다. 따라서 특허 활동은 기업의 연구개발계획을 수립하는데 중요한 역할을 할 젓으로 생각한다.

• 한국군사과학기술학회지
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• 제17권1호
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• pp.90-95
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• 2014

The system design and the system performance analysis of 3D imaging laser radar system for the mapping purpose is addressed in this article. For the mapping, a push-bloom scanning method is utilized. The pulsed fiber laser with high pulse energy and high pulse repetition rate is used for the light source of laser radar system. The high sensitive linear mode InGaAs avalanche photo-diode is used for the laser receiver module. The time-of-flight of laser pulse from the laser to the receiver is calculated by using high speed FPGA based signal processing board. To reduce the walk error of laser pulse regardless of the intensity differences between pulses, the time of flight is measured from peak to peak of laser pulses. To get 3D image with a single pixel detector, Risley scanner which stirs the laser beam in an ellipsoidal pattern is used. The system laser energy budget characteristics is modeled using LADAR equation, from which the system performances such as the pulse detection probability, false alarm and etc. are analyzed and predicted. The test results of the system performances are acquired and compared with the predicted system performance. According to test results, all the system requirements are satisfied. The 3D image which was acquired by using the laser radar system is also presented in this article.

• Structural Engineering and Mechanics
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• 제60권6호
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• pp.1001-1019
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• 2016

The connector is the most important part of a composite beam and promotes a composite action between a steel beam and concrete slab. This paper presents the experiment results for three large-scale beams with a newly puzzle shape of crestbond. The behavior of this connector in a composite beam was investigated, and the results were correlated with those obtained from push-out-test specimens. Four-point-bending load testing was carried out on steel-concrete composite beam models to consider the effects of the concrete strength, number of transverse rebars in the crestbond, and width of the concrete slab. Then, the deflection, ultimate load, and strains of the concrete, steel beam, and crestbond; the relative slip between the steel beam and the concrete slab at the end of the beams; and the failure mechanism were observed. The results showed that the general behavior of a steel-concrete composite beam using the newly puzzle shape of crestbond shear connectors was similar to that of a steel-concrete composite beam using conventional shear connectors. These newly puzzle shape of crestbond shear connectors can be used as shear connectors, and should be considered for application in composite bridges, which have a large number of steel beams.

• 한국IT서비스학회지
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• 제23권3호
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• pp.17-37
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• 2024

This study explores the tendency of corporations and organizations to continue with their current processes despite having incentives for better Information Technology (IT) innovation or transition. In this context, the study argues that organizations may struggle with 'outsourcing inertia,' a well-known concept referring to an organization's deficient adaptability to environmental changes, particularly defined here as the organization's slow adaptation to changes in outsourcing levels. To verify this, the study analyzes how key variables identified from existing IT Outsourcing (ITO) decision-making research and recent studies on cloud computing transitions actually affect a firm's transition intentions. In the process, this study investigates the moderating effect of a firm's outsourcing inertia, utilizing the Technology-Organization-Environment (TOE) framework and the Push-Pull-Mooring (PPM) model based on migration theory to propose a research model. The study aims to contribute to finding strategic approaches necessary for facilitating IT innovation and transition by understanding the impact of outsourcing inertia on the decision-making process related to IT outsourcing. It is important to note that the majority of domestic conglomerates own IT subsidiaries, which significantly influence the process of transitioning to cloud computing. Nevertheless, research on the impact of IT subsidiaries on cloud computing transition is relatively scarce. Based on this background, this study proposes that IT subsidiaries within domestic conglomerates can act as a significant mooring factor of organizational inertia in the decision-making process for adopting cloud computing. Through this, the study seeks to provide strategic insights for overcoming organizational inertia faced by IT subsidiaries during the cloud computing transition process.

• 기술혁신연구
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• 제21권2호
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• pp.355-373
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• 2013

본 논문은 국방 분야 핵심기술 공동연구개발관점에서 국제기술협력의 필요성에 영향을 미치는 요소가 무엇인가를 파악하는 연구이다. 선행연구의 거래비용 이론, 지식기반관점과 기술성숙도 측면에서 가설을 설정하였다. 그리고 국방기술품질원의 국제기술협력 대상기술 선정을 위한 설문조사 결과 분석을 기반으로 다음과 같은 사실을 발견하였다. 첫째, 국방기술의 중요도가 클수록 그 기술에 대한 국제기술협력의 필요성도 커지는 것으로 나타났다. 둘째, 국방기술의 선진국대비 상대적 기술격차가 클수록 그 기술에 대한 국제기술협력 필요성도 커지는 것으로 분석되었다. 마지막으로 국방기술의 기술성숙도가 높을수록 그 기술에 대한 국제기술협력의 필요성은 작아지는 것으로 분석되었다. 이것은 핵심기술 공동연구개발 국제기술협력이 성숙된 기술을 고도화하기 위해 협력하기 보다는 명확한 목표 없이 부족한 자원을 국제기술협력을 통해 확보하려는 인식 때문인 것으로 추정된다. 이러한 분석 결과를 토대로 본 연구는 향후 무기체계의 핵심기술 공동연구개발 추진함에 있어 무기체계별 국내 기술수준 및 기술성숙도를 고려하여 추진할 필요가 있고, 선택과 집중의 중점 협력별 국내 기술수준 및 기술성숙도를 고려하여 추진할 필요가 있고, 선택과 집중의 중점 협력 분야의 선정이 필요함을 시사하고 있다.