• 전기학회논문지
• /
• 제66권7호
• /
• pp.1111-1116
• /
• 2017

In this paper, we developed bio-signal based eye tracking system using electrooculogram (EOG) and electromyogram (EMG) which measured simultaneously from same electrodes. In this system, eye gazing position can be estimated using EOG signal and we can use EMG signal at the same time for additional command control interface. For EOG signal processing, PLA algorithms are applied to reduce processing complexity but still it can guarantee less than 0.2 seconds of reaction delay time. Also, we developed dual machine learning structure and it showed robust and enhanced tracking performances. Compare to conventional EOG based eye tracking system, developed system requires relatively light hardware system specification with only two skin contact electrodes on both sides of temples and it has advantages on application to mobile equipments or wearable devices. Developed system can provide a different UX for consumers and especially it would be helpful to disabled persons with application to orthotics for those of quadriplegia or communication tools for those of intellectual disabilities.

• 한국운동역학회지
• /
• 제20권4호
• /
• pp.415-420
• /
• 2010

The purpose of this study was to compare the thickness of the abdominal muscles during single leg holding exercise (SLH) in a hooked lying position on stable surface and on a foam roller. Healthy twenty subjects who had no medical history of lower extremity or lower back pain were recruited for this study. Muscle thickness of transverse abdominis (TrA), internal oblique (IO), and external oblique (EO) was recorded using real-time ultrasonography during SLH. Paired t-test with Bonferroni adjustment was used to compare the muscles thickness during SLH on stable surface and on a foam roller. The result showed that TrA and IO muscle demonstrated greater thickness during SLH on foam roller than those on the stable surface. This finding suggests that SLH on an unstable foam roller is more effective to increase thicknesses of TrA and IO muscles than stable surface.

• Food Science and Biotechnology
• /
• 제15권3호
• /
• pp.369-373
• /
• 2006

Water extracts obtained from cultured mountain ginseng (CMG) were evaluated for their ability to stimulate immune cells and inhibit cancer cell proliferation. The lymphocyte subpopulation in mouse splenocytes in vivo was significantly increased by the administration of the CMG extract (27.4 mg/mouse). Interleukin-2 and ${\gamma}$-interferon in the mice serum increased up to 30% in CMG extract-treated mice. At a concentration of 1.37 mg/mL, nitric oxide increased up to 400% in the macrophage cell line treated with CMG extract. The CMG extract significantly retarded the proliferation of human acute promyelocytic (HL60), human histiocytic (U937), and mouse lymphocytic (L1210) leukemia cell lines in vitro at concentrations over 2.74-13.7 mg/mL. In addition, CMG extract treatments (1.37 mg/mL and 2.74 mg/mL) lead to the increased expression of the p53 gene and protein in cultured U937 leukemia cell lines. These results indicate that water extracts of CMG are capable of both immune cell stimulation and cancer cell growth inhibition.

• Safety and Health at Work
• /
• 제12권4호
• /
• pp.505-510
• /
• 2021

Background: Factors related to root causes can cause commonly occurring accidents such as falls, slips, and jammed injuries. An important means of reducing the frequency of occupational accidents in small- to medium-sized enterprises (SMSEs) of South Korea is to perform intensity analysis of the root cause factors for accident prevention in the cause and effect model like decision models, epidemiological models, system models, human factors models, LCU (life change unit) models, and the domino theory. Especially intensity analysis in a robot system and smart technology as Industry 4.0 is very important in order to minimize the occupational accidents and fatal accident because of the complexity of accident factors. Methods: We have developed the modern cause and effect model that includes factors of root cause through statistical testing to minimize commonly occurring accidents and fatal accidents in SMSEs of South Korea and systematically proposed educational policies for accident prevention. Results: As a result, the consciousness factors among factors of root cause such as unconsciousness, disregard, ignorance, recklessness, and misjudgment had strong relationships with occupational accidents in South Korean SMSEs. Conclusion: We conclude that the educational policies necessary for minimizing these consciousness factors include continuous training procedures followed by periodic hands-on experience, along with perceptual and cognitive education related to occupational health and safety.

• 대한설비관리학회지
• /
• 제23권4호
• /
• pp.51-56
• /
• 2018

Computed tomography (CT) scan room in the department of radiology is very necessary to maintain pleasant and proper illuminance to relieve fatigue and inconvenience because it affects the work environment to the radiologist. Accordingly, this paper describes the method for measurement of illuminance that exposed to an environmental elements in a CT scan room of the hospital. Therefore, the purpose of this paper is to propose an optimal environment of CT scan room based on the measurement of illuminance. In addition, the 5 point method by KS C7612 was applied to measure the illuminance with illuminometer (Unfors xi light probe) in the CT scan room. In result of this paper, minimum value and maximum value of illuminance in the CT scan room was measured 212.7 lux and 354.8 lux, respectively. The illuminance of CT scan room was lower than KS A 3011. Finally, the work environment in CT scan room should provide higher illuminance for the comfortable environment of radiologists and patients.

• 대한물리의학회지
• /
• 제18권2호
• /
• pp.33-39
• /
• 2023

PURPOSE: This study examined the status of the efficient supply of assistive devices for students with disabilities. METHODS: A complete investigation was conducted on the request and supply of assistive devices for students with disabilities at the Korea National University of Welfare. The subjects were 112 students with disabilities who applied for assistive device rental. The status of the supply of assistive devices according to the type of disability was investigated. The overall satisfaction with learning support was measured. The questionnaire content was categorized into the following three factors to determine learning support satisfaction: support overall (role, staff, facilities) learning support (learning support, learning counseling, life consultation), assistive device supply (counseling, rental, uses, rental period, maintenance services). RESULTS: The most common type of students with disabilities was physical disabilities 62 (29.38%) and hearing impairments 62 (29.38%). Students with physical disabilities and brain lesions rented manual and electric wheelchairs the most. Learning support satisfaction was evaluated considering the factors support overall, learning and assistive device supply effects. satisfaction of learning support for students with disabilities 83.5 points. CONCLUSION: The satisfaction with assistive device supply appears to be relatively lower than support overall. Each university will gradually secure assistive devices that suit the characteristics of students with disabilities.

• 한국안광학회지
• /
• 제10권4호
• /
• pp.339-345
• /
• 2005

본 논문에서는 안내렌즈를 이용하여 무수정체안을 정시로 교정하는 원리에 대하여 연구하였다. 현재 안과에서 안내렌즈를 처방하여 임상적으로 사용하고 있는 시력 교정을, 광학적으로 보다 정확한 처방을 하기 위한 방법을 제시하였다. 무수정체안을 정시로 교정하기 위해서 비정시의 두 가지 원인인 굴절성과 축성을 고려하였고, 교정원리로는 수정체 후면에서 최적 상점까지의 거리인 상측정점 초점거리(BFL)와 수정체에서 망막까지의 거리인 초자체 길이가 일치되도록 하는 것이다. 교정원리를 확인하기 위하여 정시의 경우는 Gullstrand number I 모형안을, 근시와 원시의 경우는 실안에 대한 임상자료를 사용하여 수정체를 안내렌즈로 대치하였다.

• 동아시아식생활학회지
• /
• 제23권1호
• /
• pp.23-30
• /
• 2013

The purpose of this study was to evaluate the effects of several types of bibimbab (a Korean traditional meal of mixed rice with assorted vegetables), on various immune activities. Compared to control animals in a mouse model (given hamburgers), the oral administration of a portion of bibimbab containing wild plants significantly increased splenic B/T, thymic Th lymphocyte subpopulations, serum IFN-${\gamma}$ production, and enhanced hemagglutination titers up to 300%. Also, a consumption of mushroom-bulgogi bibimbab and Jeonju-style bibimbab markedly decreased compound 48/80-induced systemic anaphylaxis (immediate hypersensitivity), while bibimbab with wild plants inhibited SRBC-induced delayed type hypersensitivity. These results suggest that bibimbab with wild plants both up-regulate on immune activities and have anti-allergenic properties.

• 생약학회지
• /
• 제44권2호
• /
• pp.188-192
• /
• 2013

Acer tegmentosum which is belongs to Aceraceae has been widely used as a traditional medicine for the treatment of lots of diseases including pain management. In this study, we evaluated the anti-nocicepitve effects of methanolic extract of A. tegmentosum (MAT) in mice using various pain models. MAT presented strong and dose-dependent anti-nociceptive activities on thermal nociception models such as tail-immersion test and hot plate test. Moreover, acetic acid-induced chemical nociception was signigicantly reduced by MAT treatment. We could confirm MAT's central and peripheral analgesic properties by formalin test. We also found that the pre-treatment of opioid receptor antagonist did not alter the MAT's anti-nociception, suggesting opioid receptor is not involved in analgesic activity of MAT. Based on our results, we could conclude that MAT may be possibly used as an anti-nociceptive agent for the treatment of various nociceptive pains.

• 한국의학물리학회지:의학물리
• /
• 제17권3호
• /
• pp.167-172
• /
• 2006

전산화단층촬영에서 조영 증강을 위한 조영제 주입은 정맥내에 삽입한 카테터를 통해 자동주입기로 주입하고 있다. 정맥내에 위치한 카테터를 제거하는 도중에 IV 카테터가 부러져 정맥내에 남아 있는 카테터의 조각은 환자에게 순환기 질환의 위험을 초래할 수 있다. CT 검사 중에 정맥내에 카테터 조각이 남아있는 2명의 환자를 대상으로 카테터의 크기 및 위치를 정확히 확인하기 위해 MDCT를 이용하여 정맥내 주사부위를 스캔하였다. 3D 재구성은 MPR, MIP, 볼륨렌더링, SSD 등으로 구성하였다. 정맥내에 위치한 카테터 조각을 MDCT로 스캔한 데이터를 3D 재구성으로 정맥내의 위치 및 크기를 확인하였고, 카테터 조각을 제거하는데 일조하였다.