• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.17 no.2 s.105
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• pp.207-212
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• 2006

A variety of wireless devices are commercially available now. Most of studies, however, have been directed to the biological effects of mobile-phone EMF. In this paper, dosimetric analysis for wireless devices of head-mounted display type and a wristwatch type were made to investigate possible biological effects of these devices. SAR(Specific Absorption Rate) distributions were calculated using FDTD(Finite Difference Time Domain) method, for adult human models such as standard Korean human model and VHP(Visible Human Project) model, as well as scaled child models. Measurements were also performed for SAM phantom wearing a simplified prototype for a wireless device for validation of the simulation results. It has been found that children are more vulnerable to such exposure, and these devices could cause some biological effects even for relatively lower power compared to conventional mobile pones.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.8 no.2
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• pp.73-78
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• 2014

In this paper we propose a wearable elbow rehabilitation robot applied the mirror therapy for elbow rehabilitation. To implement the mirror therapy, a data suit for measuring healthy elbow motion is developed. A powered elbow exoskeleton wearing in paralyzed arm is controlled by the measured data from the healthy elbow motion. In experiments, the elbow rehabilitation exercise by the mirror therapy is performed. From the experimental results we show the wearable exercise robot including the data suit is applicable to the mirror therapy for elbow rehabilitation.

• Journal of the Korean Society of Clothing and Textiles
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• v.31 no.6 s.165
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• pp.955-965
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• 2007

Safety helmets are used widely in various industries by workers since they are legally required to wear them. However, thermal discomfort is one of the major complaints from helmet users. To relieve this problem, frozen gelled packs can be considered for use inside the helmets. In this paper, tests were performed on humans to evaluate the physiological strains of wearing safety helmets and to investigate the effects of using frozen gelled packs inside the helmets. Experiments were conducted in a climatic chamber of WBGT $33{\pm}1^{\circ}C$ under four differed experimental conditions: 1) not wearing a safety helmet(NH); 2) wearing a safety helmet with frozen gelled pack A(HA); 3) wearing a safety helmet with frozen gelled pack B(HB); and 4) wearing only a safety helmet(OH). The results were as follows. First, when comparing NH with OH, physiological responses such as $\bar{T}_{sk},\;T_r$, HR and sweat rate were significantly higher in OH and subjective sensations were reported as less hot and more comfortable than NH(p<.05). Second, in regard to the frozen gelled packs inserted inside the safety helmets, some physiological responses in HA were different from those in HB, according to the two different types of packs. HA was hotter, more uncomfortable and less exhausted than HB. However, result from both HA and HB were lower than those from OH in terms of temperature and humidity inside safety helmet, sweat rate, $T_r$ increase, heat storage(p<.05). When wearing safety helmets with frozen gelled packs, it was shown that heat strain can be alleviated. These results are expected to help millions of workers who complain that wearing safety helmets is uncomfortable and messy.

• Journal of the Korean Society of Clothing and Textiles
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• v.26 no.1
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• pp.74-82
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• 2002

The present study is aimed to investigate the effect of the safety hat on the balance of body temperature by observation of the physiological response under hot working environment. The experiment was carried out in a climate chamber of 3$0^{\circ}C$, 50%RH for 70 minutes. To compare the two kinds of safety hat, 5 healthy male subjects worn safety hat without hole (called 'without hole') or safety hat with hole (called 'with hole') according to a randomized cross-over design. The main results of this study are as fellows: Rectal temperature and heart rate were significantly lower level in 'with hole'than in 'without hole'. The mean skin temperature was significantly higher in 'without hole'than in 'with hole'. Blood pressure were significantly low in 'with hole'. Sweat rate which was measured by weight loss before and after experiment was higher in 'without hole'. In subjective ratings, subjects replied more hot, more uncomfortable and more wet, they felt more fatigue in condition of 'without hole'. Work ability which was measured by a grip strength dynamometer was higher in 'with hole'. Safety hat which can be used for safety of the brain in work place is meaningful device of behavioral thermoregulatory response under the hot working environment. The safety hat which is designed for proper ventilation and hygiene can maintain the homeostasis of body temperature by releasing body temperature efficiently.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2001.05a
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• pp.194-199
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• 2001

쾌적한 스포츠웨어는 기능성에 있어서 자연환경의 변화조건과 인체의 운동 및 활동에 맞추어 열절달 및 수분전달 등을 적절히 조절할 수 있어야 한다. 이에 본 연구에서는 일반환경조건 및 강우환경조건하에서의 형상기억 투습방수직물 소재의 스포츠웨어 착용에 따른 인체생리반응 및 쾌적감을 규명하기 위하여 스포츠웨어를 제작하여, 인공기후실에서 환경조건변화에 따른 온열생리학적 특성 및 주관적 감각을 측정, 그 특성을 비교, 고찰하였다. 평균피부온은 강우환경조건에서 온도가 낮게, 변동폭이 많게 나타났다. 변화경향을 운동부하를 기점으로 온도의 상승이 나타났고, 운동 2단계에 가장 높은 온도를 나타냈으며, 이후 감소하였다. 직장온은 일반환경조건에 비해 강우환경조건에서 온도의 미세한 상승을 보였다. 의복내 기후는 두 조건 모두에서 가슴부위보다 등부위의 온·습도의 변동폭이 크게 나타났고, 강우환경조건에서의 의복내 온도를 제외하고는 모두 등부위의 온·습도가 높게 나타났다. 최고 혈압은 운동의 강도에 따라 비례하여 상승하고, 최저 혈압에는 큰 영향없이 나타났으며, 변화경향은 의복내 온도의 경향과 역으로 나타났다. 평균혈압은 일반환경조건에서 6.9mmHg 높게 나타났다. 심박수는 일반환경조건에서 4.4beats/min 높게 나타났다. 강우환경조건의 주관적 감각의 평가에서, 신체에 직접 가해지는 빗물 등으로 인해 불쾌감이 증가하였고, 운동 후에는 일반환경조건과 달리 냉감이 증가하였으며, 습윤감은 최고치에 달하였다.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2009.05a
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• pp.123-126
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• 2009

최근 생체 신호 센싱 기능의 의류가 연구 개발되어 왔으나, 생체 신호 측정 시 착용자의 동작에 의한 치명적인 잡음이 발생하는 문제가 지속적으로 보고되어 왔다. 이에 본 연구는 심전도 센싱 의류를 기반으로 생체 신호 측정의 정확성을 향상시키기 위하여 착용자의 동작에 의한 영향을 최소화할 수 있는 심전도 센싱 스마트 의류의 모형을 개발하고자 하였다. '일자형 절개 타입', '십자형 절개 타입', '엑스형 절개 타입', '곡선 엑스형 절개 타입'의 총 네 가지 타입의 생체신호 센싱 스마트 의류의 시안을 설계하고 제작하였다. 디자인 시안은 민소매 형태의 남성용 티셔츠로 신축성 있는 소재를 사용하여 인체 굴곡을 따라 의복과 전극이 밀착될 수 있도록 하였으며, 트랜스미터를 이용하여 메인 컴퓨터로 데이터가 무선 전송되게 하였다. 본 연구에서는 개발된 4 가지 의류 타임을 기반으로 인체의 정지 및 동작 상태에서의 심전도 센싱 성능을 평가하기 위해 동작에 따른 전극의 변위를 측정하고, 심전도 측정 평가를 실시하여 SNR을 분석하였다. 본 실험 곁과를 반영하여 의류 디자인 시안의 수정 및 보완 과정을 거친 후, 최종적으로 동작 잡음을 최소화하는 생체신호 센싱 스마트 의류 디자인 모형을 제시하였다.

• Proceedings of the Korean Fiber Society Conference
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• 2003.04a
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• pp.263-266
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• 2003

섬유제품과 기술의 스마트화에 따라 소재와 가공 및 프로세싱에서 새로운 개념과 복합적인 기능을 가진 섬유제품이 개발되고 있으나 이들 제품을 평가하는 기술이나 표준 또는 장비는 이에 부응하지 못하는 경우가 많다. 섬유제품의 주요 성능중의 하나인 착용감을 평가하는 기술은 레저ㆍ스포츠 웨어의 개발이 활발하고 수요가 급증하는데 비하여 이들 성능을 제대로 평가하는 기술은 확립되어 있지않은 상태이다. (중략)

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2009.11a
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• pp.62-65
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• 2009

본 연구는 동작 속도별 마찰음의 주관적 평가에 있어서 시각적 변수의 영향을 분석하는 것을 목적으로 한다. 현재 유통되고 있는 79 종의 스포츠웨어용 투습발수직물 중 음향 특성으로 계층적 군집분석에 의해 나누어진 3 개의 군집에서 각각 하나씩 추출한 총 3가지 시료를 대상으로 walking, jogging, running의 속도로 마찰시켜 총 9가지의 소리에 대하여 실험하였다. 직물 소리에 대한 주관적 평가 시 시각적 변수의 영향을 분석하기 위하여 두 가지 방법으로 직물 소리에 대한 주관적 반응을 평가하였다. 첫 번째는 기존의 연구에서 주로 이루어진 방법으로, 실험 진행자가 피험자에게 직물소리를 들려주면서 설문을 하게 하였다. 두 번째는 녹음된 직물의 소리와 함께 모니터를 통해 해당 자극물의 마찰 속도에 따라 인체 모델이 움직이는 동작을 보여줌으로써 청각과 시각 자극을 동시에 제시하여 주관적 평가의 자극물로 사용하였다. 주관적 평가는 8개의 형용사 쌍에 대해 의미미분척도로 평가되었고, 두 가지 방법을 비교하기 위하여 '실제 옷을 착용하고 움직일 때 발생하는 직물 소리와 유사하게 들린다.' 와 '옷을 착용하고 움직일 때 발생하는 소리라고 느껴진다.' 두 문항을 추가하여 평가하였다. 그 결과 시각 자극의 유무에 의한 감성평가 결과에는 큰 영향을 미치지는 않았지만, 피험자가 소리만으로 직물이 마찰되는 장면을 의식적으로 상상해야 하는 심리적 부담을 줄여주었고, 주관적 평가 몰입도를 향상시켰다고 사료된다.

• Science of Emotion and Sensibility
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• v.16 no.1
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• pp.1-10
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• 2013

The purpose of this paper is to investigate the adequate clothing pressure of upper and lower body foundation garment and subjective assessment of those compressive foundation depending on various wearing conditions. Eighteen women in their 30s and 40s participated in the experiments for this study to evaluate the level of clothing pressure of girdle and waist nipper. Subjects were divided into two groups by the wearing habits of foundation, one is the group of wearing foundation garment 'tightly' and the other is 'loosely', It was found that the group wearing foundation garment 'loosely' was much more sensitive than the group of 'tightly' in everyday life. The adequate pressure of upper foundation, waist nipper was about $1.5{\pm}0.8$ kPa which is lower than that of the lower body foundation, girdle. And at the same time, the sensitivity of the pressure level was higher when subjects are wearing waist nipper compared with wearing girdle. Therefore, precise pattern making process is necessary to meet the adequate level of pressure of the upper body foundation such as waist nipper, specially for those who used to wear clothing loosely.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.3
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• pp.597-602
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• 2021

Even in the era of the 4th industrial revolution, the prevention of industrial accidents is still an important issue in industrial sites. In solving the problem of industrial safety, a product can be difficult to market if there is a lack of standard or method for a reliable performance evaluation. The purpose of this study was to develop and evaluate a test method for a wearable airbag product for protecting the body from falls that was newly developed to respond to fall accidents in industrial sites. As a research method, reliable evaluation standards were developed and applied through four stages of the evaluation and development process (Step 1: Product review, Step 2: Data research, Step 3: Expert meeting, Step 4: Drawing evaluation standard). In addition, the impact force was evaluated according to the developed evaluation standard. The fall impact force obtained through the evaluation showed a reduction effect of approximately 96% compared to the existing impact force. Therefore, the fall impact force was reduced significantly when the airbag was applied. This will enable new convergence products to be launched on the market and produce an environment where industrial workers can work safely.