• 국제강구조저널
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• 제18권5호
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• pp.1589-1597
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• 2018

Fatigue tests and numerical analysis were carried out to evaluate the fatigue performance at the U-rib to deck welded joint in steel box girder. Twenty specimens were tested corresponding to different penetration rates (80 and 100%) under fatigue bending load, and the fatigue strength was investigated based on hot spot stress (HSS) method. The detailed stress distribution at U-rib to deck welded joint was analyzed by the finite element method, as well as the stress intensity factor of weld root. The test results show that the specimens with fully penetration rate have longer crack propagation life due to the welding geometry, resulting in higher fatigue failure strength. The classification of FAT-90 is reasonable for evaluating fatigue strength by HSS method. The penetration rate has effect on crack propagation angle near the surface, and the 1-mm stress below weld toe and root approves to be more suitable for fatigue stress assessment, because of its high sensitivity to weld geometry than HSS.

• 정보보호학회논문지
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• 제15권4호
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• pp.51-60
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• 2005

통신망과 저장장치의 발달에 따라 내부 사용자에 의한 중요 정보 자산의 외부 유출이 증가하고 있으므로 이에 대한 보안을 강화해야할 필요성이 증대되고 있다. 제안한 파일유출 모니터링시스템은 클라이언트에서 파일이 저장매체에 저장/복사되거나 파일이 종이문서로 인쇄되어 외부로 유출되는 경우에 로그를 발생시켜 서버에서 이를 모니터링한다. 모니터링 방법은 커널 레벨에서 I/O Manager에 의해 발생하는 IRP의 필터링과 Win32 API 후킹 기법을 사용하였다. 특히 파일을 저장매체에 저장하는 경우, 네트워크 공유를 통하여 파일을 저장하는 경우 및 파일의 인쇄를 통하여 유출하는 경우에 로그를 발생시키고 모니터링하는 방법을 구현하였다. 모니터링시스템은 윈도우즈 2000 및 XP 실험환경에서 파일의 복사와 인쇄 시 로그가 $100\%$ 발생되고 모니터링 기능이 수행됨을 확인하였다.

• Journal of Information Science Theory and Practice
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• 제9권1호
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• pp.54-67
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• 2021

This paper presents the ISRI (Information Systems Research Indicators) Web tool, publicly and freely available at isri.sciencesphere.org. Targeting Information Systems (IS) researchers, it compiles and organizes IS adoption and use theories/models, constructs, and indicators (measuring variables) available in the scientific literature. Aiming to support the IS theory development process, the purpose of ISRI is to gather and systematize information on research indicators to help researchers and practitioners' work. The tool currently covers eleven theories/models: DeLone and McLean's IS Success Model (D&M ISS); Diffusion of Innovations Theory (DOI); Motivational Model (MM); Social Cognitive Theory (SCT); Task-Technology Fit (TTF); Technology Acceptance Model (TAM); Technology-Organization-Environment Framework (TOE); Theory of Planned Behavior (TPB); Decomposed Theory of Planned Behavior (DTPB); Theory of Reasoned Action (TRA); and Unified Theory of Acceptance and Use of Technology (UTAUT). It also includes currently over 400 constructs, nearly 2,500 indicators, and about 60 application contexts related to the models. For the creation of the tool's database, nearly 580 references were used.

• 한국항공운항학회지
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• 제29권4호
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• pp.96-104
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• 2021

Technological advances have recently led to the development of Urban Air Mobility (UAM) which is a small airplane being able to take off and land vertically. It is emerging as an alternative to transportation services in the city in the future because of the advantage of providing speed and congestion problem in cities like taxis. This research aim to study the user's acceptance of UAM. Based on the survey conducted abroad, the analysis was carried out based on th Technology Acceptance Model (TAM), by Davis et al. (1989). According to the data analysis results of 292 people, Technology, Reliability and Price effect perceived usefulness, which in turn effects Behavioral intention. UAM cannot be operated independently by a single company. It consists of partnerships with vehicles, transport platforms, batteries and other related company. To improve acceptance of UAM, it is required that collaboration between companies and support from government. And while UAM is being developed, research on acceptance from user's point of view should continue.

• 한국지진공학회논문집
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• 제26권1호
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• pp.1-11
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• 2022

In this study, the seismic performance of a two-story unreinforced masonry (URM) building was assessed following the linear and nonlinear static procedures specified in the seismic evaluation guideline of existing buildings. First, the provisions to assess failure modes and shear strengths of URM walls and wall piers were reviewed. Then, a two-story URM building was assessed by the linear static procedure using m-factors. The results showed that the walls and wall piers with aspect ratios h_e // (i.e., effective height-to-length ratio) > 1.5 were unsafe due to rocking or toe crushing, whereas the walls with h_e // ≤ 1.5 and governed by bed-joint sliding mainly were safe. Axial stresses and shear forces acted upon individual masonry walls, and wall piers differed depending on whether the openings were modeled. The masonry building was reevaluated according to the nonlinear static procedure for a more refined assessment. Based on the linear and nonlinear assessment results, considerations of seismic evaluation for low-rise masonry buildings were given with a focus on the effects of openings.

• 한국농촌간호학회지
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• 제17권2호
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• pp.67-74
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• 2022

Purpose: This study aimed to describe a non-face-to-face dementia prevention and physical activity program in small rural villages during the COVID-19 pandemic. Methods: The study used a case report provided by a primary healthcare post in Gyeonggi-do in 2020. Results: The program was "From head to toe, stay healthy", which was largely divided into dementia prevention ("Dementia Zero Zone") and physical activity ("The less fat, The healthier body"). Five elderly people aged 75 and over participated for preventing dementia, and 13 residents joined the health promoting programs over 80 times in total. This program was designed one-to-one customized and person-centered program, including counseling, education, and health services. The program participants responded that the amount of physical activities was increased even under strict social distancing and they felt less isolated and less depressed. Moreover, the number of screening for dementia was increased with this program. Conclusion: This case has shown the applicability of a new approach to sustain health promotion programs in the context of limited interaction with rural nurses. Under the challenging environment that requires adaptation to information and communication technologies (ICTs), it will be necessary to solve not only technical problems but also digital literacy issues of rural residents.

• Geomechanics and Engineering
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• 제29권6호
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• pp.645-655
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• 2022

Granular columns have recently found widespread use in underground construction. The behaviour of granular columns under vertical loads has been extensively studied, specifically in relation to vertical load capacity obtained by bulging of the column body, including the behaviour after encasement of material. Determining the shear strength of loose soils reinforced with granular columns has received less attention. After the observations of lateral deformation near the toe of the embankment, attempts have been made to strengthen the lateral strength of granular columns. The purpose of this research is to look into the effects of different encasement conditions on the lateral load capacity of granular columns. This was accomplished by three-dimensional finite element analysis with FEM software. Various normal pressures and two different encasement configurations, namely single layer encasement and double layer encasement, with differing tensile strengths, were used in this study to determine their effect on lateral resistance. The failure envelope for a single column planted in loose sand was used to analyse the findings for three different granular column diameters, as well as the impact of different encasement conditions. According to the findings, the inclusion of a Granular Column enhanced the shear strength and overall stiffness of the loose sand bed, and the encasement of the Granular Column helped in deriving higher lateral resistance.

• 대한정형외과학회지
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• 제56권5호
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• pp.433-439
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• 2021

파상풍 감염에 대한 확실하고 효율적인 예방법이 있어 선진국에서의 발병률과 사망률은 현저히 감소하였으나 이로 인해 파상풍 감염에 대한 인지도 저하 및 예방접종 규칙 미준수로 최근 발병률의 증가 추세를 보인다. 파상풍 감염 결과는 치명적일 수 있어 예방이 우선되어야 하며 감염 시 적극적인 수술적 처치와 지지요법을 통해 치료해야 한다. 이에 저자들은 족부 부상으로 인해 발생한 59세 남성 환자의 전신 파상풍 증례를 통해 감염된 족부에 적극적 외과적 변연절제술 및 절단을 시행하였고 2개월간 지지요법을 통해 환자는 성공적으로 회복하였다.

• International Journal of Korean Welding Society
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• 제1권1호
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• pp.51-57
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• 2001

Effect of the joint details on the stress distribution over a slot structure has been studied in order to improve its fatigue life using a finite element analysis. The joint details of interest are the radius and height of scallop at the stiffener as well as the mis-alignment between the stiffener and longitudinal member. For a slot structure currently used, the stiffener heel is subjected to the maximum stress for a given external load, where is a potential fatigue crack initiation site. The stresses at the stiffener heel and toe decrease both by increasing the scallop radius and more significantly by increasing the mis-alignment while no notable effect of the scallop height on it is appreciated. A proper combination of these factors makes it possible to reduce the stresses at the stiffener heel and In, theoretically, more than 50%. This is attributed to the modification of the stress distribution over the slot structure including the transition of the maximum stressed region from the stiffener heel to the slot surface of the transverse web. Such then results in a g[eat improvement of the fatigue life of the slot structure.

• 한국임상수의학회지
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• 제39권6호
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• pp.378-383
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• 2022

A 3-year-old, 24-kg intact female Border Collie was referred for a toe-touch weight-bearing stance, intermittent weight-bearing lameness, and moderate pain reaction of the right forelimb on physical examination and right humerus olecranon avulsion fracture on diagnostic imaging examination. Surgical repair was performed using tension band wiring to re-attach the triceps tendon and distal olecranon. Migration of the distal olecranon fragment was observed due to comminuted fracture of the fragment 5-days after surgery, and revision surgery was performed. The tension-relieving sutures were passed through the pre-drilled hole in the olecranon, and the polyester mesh was augmented to the suture region, covering the triceps tendon and olecranon drilling hole using the Krackow suture pattern. The elbow joint was immobilized using a type IA transarticular external fixator, which was removed 8 weeks after surgery. Fourteen weeks after surgery, no lameness was observed on gait evaluation. At follow-up after 7 months, the distal olecranon fragment had stabilized, and no lameness was observed.