• Fibers and Polymers
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• 제6권4호
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• pp.322-331
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• 2005

Graduated compression stockings (GCS) have been widely used for the prophylaxis and treatment of venous diseases. Their gradient pressure function largely related to their fabric structure and material properties. By combing fabric physical testing and wear trials, this study investigated the GCSs fabric structure and material properties at different locations along the stocking hoses, and quantitatively analyzed the effects of fabrics on skin pressure longitudinal and transverse distributions. We concluded that, Structural characteristics and material properties of stocking fabrics were not uniform along the hoses, but a gradual variation from ankle to thigh regions, which significantly influenced the corresponding skin pressure gradient distributions; Tensile (WT, EM) and shearing properties (G) generated most significant differences among ankle, knee and thigh regions along the stocking hose, which significantly influenced the skin pressure lognitudinal gradient distribution. More material indices generating significant gradual changes occurred in the fabric wale direction along stocking hose, meaning that materials properties in wale direction would exert more important impact on the skin pressure gradient performances. And, the greater tensibility and smoother surface of fabric in wale direction would contribute to put stocking on and off, and facilitate wearers' leg extension-flexion movements. The indices of WT and EM of stocking fabrics in series A have strong linear correlations with skin pressure lognitudinal distribution, which largely related to their better performances in gradual changes of material properties. Skin pressure applied by fabric with same material properties produced pronounced differences among four different directions around certain cross-sections of human leg, especially at the ankle region; and, the skin pressure magnitudes at ankle region were more easily influenced by the materials properties, which were considered to be largely related to the anatomic structure of human leg.

• 대한기계학회논문집A
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• 제21권12호
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• pp.2121-2133
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• 1997

A finite element code is developed for 3-D self-contact problems, using continuum elements with a SRI(Selective Reduced Integration) scheme to prevent locking phenomenon by the incompressibility of rubber. Contact treatment is carried out in two ways : using the displacement constraints in case of rigid contact ; and imposing the same contact forces on two contact boundaries in case of self-contact. The finite element code developed is applied to the deformation analysis of C.V.joint boots which maintain lubrication conditions and protect the C.V.joint assembly from impact and dust. The boot accompanies large rotation depending on the rotation of the wheel axis and leading to the self-contact phenomena of the boot bellows. Since this contact phenomenon causes wear of the product and has great influence on the endurance life of the product, it is indispensable to carry out stress analysis of the rubber boots. In case of self-contact, various methods for determining contact forces have been suggested with an appropriate contact formulation. Especially, the types of penetration in self-contact are modularized to accelerate conputation with a contact algorithm.

• PNF and Movement
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• 제17권3호
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• pp.391-399
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• 2019

Purpose: This study investigated the three-dimensional moment values of the hip joint for subjects with artificial leg length alterations and subjects with unaltered leg lengths. Methods: Forty-two healthy adults (8 men, 34 women) participated in this study. The selected subjects were able to walk normally, had less than a 1 cm leg length discrepancy, and were instructed to wear shoes that fit their feet. The study participants performed 8 dynamic gait trails to measure the hip joint moment using a three-dimensional motion analysis system. Kinetic and dynamic three-dimensional gait analysis data were collected from infrared cameras, and a force plate was used to standardize the weight of each subject. Results: There were significant correlations between the differences in the leg length discrepancy during right extension, right flexion, right internal rotation, and left extension in hip joint moments (p<0.05). There were significant correlations between the differences in shoe conditions during left extension, right flexion, right extension, and right internal rotation in the hip moments (p<0.05). Conclusion: This study suggests that a leg length discrepancy can affect hip joint moment, which may further exacerbate musculoskeletal disorders, such as osteoarthritis in lower extremity joints. Therefore, further studies should be conducted to verify the impact of clinical interventions on differences in hip joint moment values to correct leg length discrepancies and prevent osteoarthritis in lower extremity joints.

• 한국산학기술학회논문지
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• 제14권1호
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• pp.109-115
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• 2013

이 연구는 대구광역시와 경상북도에 소재하는 각각 3곳의 노인복지관 및 노인대학의 65세 이상 노인 501명을 대상으로 구강보건진료 관리 항목이 자가인식구강상태에 미치는 영향력을 조사함으로써 효과적인 구강보건관리 방안을 모색하기 위해 연구를 실시하였다. 연령에 따른 구강보건진료 관리 항목의 선호도를 조사한 결과, 65~69세는 불소도포, 65~74세는 치석제거, 칫솔질 교습, 70~74세는 틀니 세정 및 관리, 75세 이상은 틀니 제작을 선호하였다. 구강보건진료 관리 항목이 노인의 자가인식구강상태에 미치는 영향력은 현 구강상태가 좋지 않고, 저작지장이 많으며, 구강건조가 있을수록 틀니 제작을 가장 선호하는 것으로 나타났다. 치아수가 적고, 틀니를 가지고 있을수록 틀니 세정 및 관리를 가장 선호하였으며, 흔들리는 치아가 있고, 치통이 자주 있을수록 발치를 가장 선호하는 것으로 나타났다. 연령과 구강상태에 따라 구강보건진료 관리 항목의 선호도에 차이가 있으므로 각 개인에게 맞는 구강보건관리를 적용해야 할 것이다.

• 폴리머
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• 제29권5호
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• pp.481-485
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• 2005

본 연구에서는 2관능성 에폭시 수지에 기상성장 탄소나노섬유(VGCNFs)를 0, 0.1, 0.5, 1.0 그리고 $2wt\%$ 함량 비로 첨가하여, 제조한 VGCNFs/에폭시 복합재료의 열적 및 기계적 특성을 고찰하고자 하였다. VGCNFs/에폭시 나노복합재료의 열적 특성은 TMA와 DMA로 알아보았으며, 기계적 특성은 만능 시험기와 낙하 충격 시험기 및 마찰$\cdot$마모 시험기를 통하여 관찰하였다. 실험 결과. VGCNFs의 함량이 증가할수록 열적 및 기계적 특성이 향상됨을 확인할 수 있었는데, 이는 현재의 복합재료 시스템에 있어서 VGCNFs와 에폭시 사이의 기계적 얽힘 현상의 향상을 가져오는 복합재료의 가교구조의 증가 때문이라 판단된다.

• Safety and Health at Work
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• 제1권1호
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• pp.19-28
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• 2010

Industrial Safety and Health Law (ISH Law) of Japan requires abnormalities identified in evaluations of worker health and working environments are reported to occupational physicians, and employers are advised of measures to ensure appropriate accommodations in working environments and work procedures. Since the 1980s, notions of a risk assessment and occupational safety and health management system were expected to further prevent industrial accidents. In 2005, ISH Law stipulated workplace risk assessment using the wording "employers shall endeavor." Following the amendment, multiple documents and guidelines for risk assessment for different work procedures were developed. They require ISH Laws to be implemented fully and workplaces to plan and execute measures to reduce risks, ranking them from those addressing potential hazards to those requiring workers to wear protective articles. A governmental survey in 2005 found the performance of risk assessment was 20.4% and common reasons for not implementing risk assessments were lack of adequate personnel or knowledge. ISH Law specifies criminal penalties for both individuals and organizations. Moreover, under the Labor Contract Law promulgated in 2007, employers are obliged to make reasonable efforts to ensure employee health for foreseeable and avoidable risks. Therefore, enterprises neglecting even the non-binding provisions of guidelines are likely to suffer significant business impact if judged to be responsible for industrial accidents or occupational disease. To promote risk assessment, we must strengthen technical, financial, and physical support from public-service organizations, encourage the dissemination of good practices to reduce risks, and consider additional employer incentives, including relaxed mandatory regulations.

• 융합정보논문지
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• 제11권12호
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• pp.80-89
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• 2021

2020년 1월 30일, 세계보건기구(World Health Organization)는 COVID-19의 확산이 "국제보건규정(International Health Regulations)" 제1조에 규정된 "국제적 공중보건 비상사태(Public Health Emergency of International Concern)"의 기준을 충족한다고 선언하고, 팬데믹 퇴치를 위한 다양한 예비 권고를 제안하였다. 이후 3월부터 팬데믹이 본격화되면서 (일부 국가에서는 마스크 착용이 법으로 금지되었음에도 불구하고) 갑자기 공공장소에서 마스크를 쓰라는 지시가 내려졌다. 경제·사회 환경이 예상치 못한 방향으로 바뀌면서 법조계에서도 화상심리 도입 등 조금씩 변화의 바람이 불기 시작했다. 아마도 COVID-19 이후에는 이전의 일상과는 매우 다른 모습으로 변화될 가능성이 크다. COVID-19가 국제중재 진행방식에도 영향을 미치고 있는바 관건은 이러한 영향이 몇 년 동안만 지속되는 일시적인 문제로 그칠 것인지, 아니면 COVID-19의 확산이 국제중재 진행방식의 전환점이 될 것인지가 의문이다. 이러한 이해를 바탕으로 본 연구는 COVID-19가 국제중재에 미치는 영향 및 효과를 고찰하고, 향후 전망을 제시한다.

• Corrosion Science and Technology
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• 제20권1호
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• pp.26-36
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• 2021

Pipes operating in the seawater environment faces cavitation degradation and corrosion of the metallic component, as well as a negative synergistic effect. Cavitation degradation shows the mechanism by which materials deteriorate by causing rapid change of pressure or high-frequency vibration in the solution, and introducing the formation and explosion of bubbles. In order to rate the cavitation resistance of materials, constant conditions have been used. However, while a dynamic cavitation condition can be generated in a real system, there has been little reported on the effect of ultrasonic amplitude on the cavitation resistance and mechanism of composites. In this work, 3 kinds of epoxy coatings were used, and the cavitation resistance of the epoxy coatings was evaluated in 3.5% NaCl at 15 ℃ using an indirect ultrasonic cavitation method. Eleven kinds of mechanical properties were obtained, namely compressive strength, flexural strength and modulus, tensile strength and elongation, Shore D hardness, water absorptivity, impact test, wear test for coating only and pull-off strength for epoxy coating/carbon steel or epoxy coating/rubber/carbon steel. The cavitation erosion mechanism of epoxy coatings was discussed on the basis of the mechanical properties and the effect of ultrasonic amplitude on the degradation of coatings.

• 패션비즈니스
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• 제23권1호
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• pp.25-36
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• 2019

The purpose of this study is to offer a base line data to facilitate entrance of a Korean fashion company into the Uzbekistan market by conducting a survey of the Uzbekistan students in Korea. This is done in order to gather data on their clothes wearing condition and factors affecting the purchase intention for Korean fashion products. In this study, a survey was conducted to 260 Uzbekistan students in Korea. The results of the study were as follows: 1) Uzbekistan students bought clothes mainly from road shops and the Internet. They bought a lot of pants, shirts, jackets, jumpers, and preferred to wear black, white, blue, and red color. The dissatisfactory parts were shown in order of the width of trousers, the length of the sleeve, and the shoulder. The most unsatisfying products were the pants and T-shirt. 2) They considered the aesthetics of the fashion products evaluation criteria, the human source and the internet advertisement of the fashion information source, and the customer service of the store selection criteria. These students showed very favorable attitude towards Hallyu and Korea. In addition, their preference and purchase intention for KFP were high. 3) The level of satisfaction on 'quality', 'color', and 'care' of KFP were very high, but lowest on the 'size' and 'price' of the clothes. 4) It was revealed that the attitude toward Hallyu and Korea, the satisfaction and preference of KFP, and demographics have a significant impact on the intention toward purchasing fashion products.

• 한국의류산업학회지
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• 제21권5호
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• pp.606-617
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• 2019

The present study newly developed a firefighters' protective jacket and pants using a Nomex honeycomb structured layer (HPC) in cases of being exposed to flashover or flameover. This study evaluated the protective and comfort functions of an HPC compared to the current KFI firefighters' protective clothing (FPC). The results are as follows. First, thermal protective performance (TPP) of fabric layers was 2.75 times greater for HPC than FPC at $125kW/m^2$. Second, the predicted second and third degree burn areas were smaller for HPC than FPC when using a flame manikin. Third, thermal insulation using a thermal manikin was 0.2 clo greater for HPC than FPC. Fourth, there were no marked differences in maximal performance, mobility, and microclimate temperature/humidity between FPC and HPC through human wear trials. The thermal insulation of HPC was higher than that of FPC; however, any negative effect of HPC thermal insulation on the comfort functions for firefighters was not found. In conclusion, the newly-developed HPC provided more protection in reducing burn injuries from $125kW/m^2$, while no negative impact on maximal performance, mobility and thermal comfort functions of firefighters, which is appropriate for quick-evasive tactics at the flashover, flameover or back draft fires.