• 국제물리치료학회지
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• 제1권2호
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• pp.169-175
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• 2010

The purpose of this study was to analyze and compare the effect of resistance exercise and balance exercise on proprioception and WOMAC index of patients with degenerative knee osteoarthritis. A total of 40 subjects participated in this study. The subjects were diagnosed with degenerative knee osteoarthritis and all were more than 60 years old. They were divided into three groups. Group I(n=8) was trained with resistance exercise, Group II(n=6) was trained with balance exercise and Group III(n=6) was trained with range of motion as a control. The results of this study were as follows. It was significantly indicated that the resistance exercise group and balance exercise group elicited error-reduction on proprioception goal-angle (p<.05). There was a statistically significant difference on proprioception between resistance exercise group and control(range of motion) group. There was a statistically significant reduction on WOMAC index between resistance exercise group and balance exercise group (p<.05) and on the WOMAC index between resistance exercise group and range of motion group(p<.05). In conclusion, resistance exercise and balance exercise are effective on degenerative knee osteoarthritis and resistance exercise is the most effective for improving proprioception and WOMAC index. More research on the intervention according to the degree of degenerative knee osteoarthritis is needed.

• 동아시아식생활학회지
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• 제19권5호
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• pp.713-722
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• 2009

Vitamin D levels have been reported to be associated with diabetes, obesity and metabolic syndrome. There have been studies on the nutritional status of vitamin D in postmenopausal women at Seoul and premenopausal women at Busan, and these studies showed that nearly no relationship between serum vitamin D levels and the obesity index existed. However, there have been no studies that examined about the relationship between serum vitamin D levels and insulin resistance in Korea. In this study, we investigated serum vitamin D levels and the relationship between serum vitamin D levels and insulin resistance (homeostasis model assessment of insulin resistance), obesity index (body mass index, percentage of body fat and waist circumference) in 180 premenopausal women (non-obese women 87.8%, obese women 12.2%) in spring (March~April), fall (September~October) and winter (January~February) at Daejeon. Serum vitamin D levels were lower in winter than in spring-fall, after adjusting for age and the obesity index. The frequency of vitamin D inadequacy (serum vitamin D levels were $\leq$ 20 ng/mL) was 45.5% in winter and, 23.5% in spring-fall, and which showed that vitamin D inadequacy was higher in winter than in spring-fall. Multiple regression analysis showed that serum vitamin D levels had no relationship with the obesity index or insulin resistance. There was no difference in the obesity index or insulin resistance between the vitamin D inadequacy and normal group, and there was no relationship between serum vitamin D levels and the obesity index or insulin resistance in non-obese and obese premenopausal women, respectively. In conclusion, serum vitamin D levels in premenopausal women at Daejeon were lower in winter than in spring-fall, and the frequency of vitamin D inadequacy was higher in winter than in spring-fall. Serum vitamin D levels had no relationship with the obesity index or insulin resistance in premenopausal women, most of whom were not obese.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제27권2호
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• pp.157-161
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• 2001

The purpose of this study cephalometrically evaluated changes in the posterior airway space for patients with obstructive sleep apnea syndrome(OSAS) before and after surgical advancement of the maxilla and mandible. The change in calculated airway resistance was correlated with the respiratory disturbance index(RDI). Twenty cephalometric radiographs were traced before and after surgery to determine the posterior airway area and calculate resistance. Polysomnograms of each patient were obtained before and after surgery. All patients had a decrease in calculated airflow resistance in the airway. The mean amount of resistance was 865.15 before surgery, decreasing to 192.65 after surgery (p<0.01). Eighty-five percent of the patients experienced improvement in their RDI. Reduction in the RDI appears to be due to an increase in the posterior airway space and decrease in flow resistance.

• Geomechanics and Engineering
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• 제15권3호
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• pp.879-888
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• 2018

Probability-based design codes have been developed to sufficiently confirm the safety level of structures. One of the most acceptable probability-based approaches is Load Resistance Factor Design (LRFD), which measures the safety level of the structures in terms of the reliability index. The main contribution of this paper is to calibrate the load and resistance factors of the design code for tunnels. The load and resistance factors are calculated using the available statistical models and probability-based procedures. The major steps include selection of representative structures, consideration of the limit state functions, calculation of reliability for the selected structures, selection of the target reliability index and calculation of load factors and resistance factors. The load and resistance models are reviewed. Statistical models of resistance (load carrying capacity) are summarized for strength limit state in bending, shear and compression. The reliability indices are calculated for several segments of a selected circular tunnel designed according to the tunnel manual report (Tunnel Manual). The novelty of this paper is the selection of the target reliability. In doing so, the uniform spectrum of reliability indices is proposed based on the probability paper. The final recommendation is proposed based on the closeness to the target reliability index.

• 한국해안·해양공학회논문집
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• 제32권6호
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• pp.458-464
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• 2020

유공케이슨 방파제의 한계상태설계법 개발을 위해 하중저항계수 보정을 수행하였다. 전국 항만의 12개 유공케이슨식 방파제에 대하여 설계변수의 불확실성을 고려한 신뢰성해석을 수행하였다. 목표신뢰성지수에 따른 부분 안전계수와 하중, 저항계수를 차례로 산정하였다. 최적화기법을 통해 한계상태설계법 개발을 위한 하중계수와 저항계수를 도출하였다. 최종 하중저항계수를 이용하여 방파제를 재설계하였으며 목표수준의 신뢰성지수를 상회하는지 검증하였다. 목표신뢰성지수를 변화시켜 해당 수준에 맞는 하중저항계수를 최종 제시하였다.

• Corrosion Science and Technology
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• 제7권6호
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• pp.319-323
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• 2008

The polarization resistance of mild steel in 0.5M hydrochloric acid has been evaluated by using impedance (Z) and linear polarization (LPR) techniques and compared to the noise resistance obtained from electrochemical noise data. The degree of localization of this general corrosion has also been discussed by evaluating localization index and power spectral density. Polarization resistance obtained by LPR technique ($28\Omega$) was higher than that obtained by impedance technique ($15\Omega$). Noise resistance ($11\Omega$) was much lower than polarization resistance measured by both of above techniques. Higher polarization resistance obtained by LPR technique is generally caused by passivation effect in the presence of scales or deposits which can introduce an increased resistance as can low conductivity electrolytes. The reason why noise resistance is lower than polarization resistance is the effect of background noise detected by using three platinum electrodes cell in 0.5M hydrochloric acid. Slope($-\beta$) of power spectral density (PSD) obtained from analysis of noise data ($-\beta$ = 3.3) was much higher than 2 which indicates mild steel corroded uniformly. Localization index (LI) calculated from statistical analysis (LI=0.08) is much lower than 1 which indicates that mild steel did not corroded locally. However, LI value is still higher than $1x10^{-3}$ and this indicates that mild steel corroded locally in microscopic point of view.

• 한국전기전자재료학회논문지
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• 제28권1호
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• pp.51-56
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• 2015

The object of this study is to obtain the optimum mix proportion of halogen free compound with flame resistance and, for the purpose, thermal/electrical characteristics test are conducted using compatibilizing agents, flame resistance agents, hydroxide aluminum, sunscreen, antioxidant and silicon oil on the base resin of linear low density polyethylene (LLDPE), Ethylene vinyl acetate copolymer (EVA). Existing compound method accompanies many requirements to be satisfied including a lot of addition of flame resistance agents, prohibition of impact on mixing capability with base and property and etc. In this study, different from the existing method, the optimum mix proportion is determined and experimented by adding nano clay. Oxygen index test shows no difference between specimens while T-6, T-9 shows oxygen index of 29[%] and 26[%], respectively. This is concluded that hydroxide aluminum, which is a flame resistance agent, leads low oxygen index. From UL94-V vertical flame resistance test, the combustion behavior is determined as V-0, Fail based on UL94-V decision criteria. Viscometry shows low measurements in specimens with separate addition of compatibilizing agents or nano clay. Volume resistivity test shows low measurement mainly in specimens without compatibilizing agents. Therefore, with the flame resistance compound shows better performance for thermal/electrical property and the optimum mix proportion are achieved among many existing materials.

• 식물병연구
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• 제17권3호
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• pp.311-316
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• 2011

고추 흰가루병은 시설재배의 증가로 경제적인 피해가 증가하는 병해이다. 본 연구에서는 고추 유전자원의 흰가루병 저항성 평가를 위한 새로운 저항성 평가 방법을 개발하였다. S index라고 명명한 평가방법의 공식은 다음과 같다; (최상위 발병 엽수/정단부 엽수) - (최하위 발병 엽수/정단부 엽수). 흰가루병에 의해 발병된 고추 식물체에서 이병엽율과 S index는 81%(P = 0.01)의 정의 상관으로 고도의 유의성을 보였다. 그리고 34종의 유전자원에서 저항성을 평가한 결과, S index는 흰가루병 저항성 계통을 구분할 수 있는 것으로 확인되었다. 이들 중 Capsicum frutescens 인 3CA131과 C. baccatum인 3CA0162, 3CA174, 3CA176은 흰가루병에 강한 저항성으로 평가되었다. 이 결과는 고추 흰가루병 저항성품종 육성에서 Sindex의 유용성을 증명한 결과이다.

• 한국산학기술학회논문지
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• 제18권3호
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• pp.199-208
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• 2017

신체조성과 혈관탄성의 변화로 인한 심혈관질환과 근감소로 인한 낙상의 발생은 노화로 인하여 가장 빈번하게 발생하게 된다. 그래서 탄력밴드 저항운동은 노인들이 쉽고 안전하게 수행할 수 있으며 신체조성과 혈관탄성에 긍정적인 영향을 미칠 수 있을 것이다. 따라서 본 연구는 고령여성(>65 years)을 대상으로 12주간 저항운동을 실시한 후 신체조성, 혈관탄성, 낙상위험도지수에 어떠한 효과를 미치는지에 대하여 살펴보았다. 저항운동은 주3회 한 회당 60분으로 구성되었고 운동 강도는 Borg의 운동자각도(6 - 20)에서 11-14로 설정되었다. 신체조성에 해당하는 체중, 근육량, 체지방률, BMI(Body Mass Index)와, 혈관탄성(맥파속도 (Pulse wave velocity (PWV)), 낙상위험도지수(Risk of falling)는 훈련 전과 후에 측정이 되었다. 연구 결과 신체조성에서 운동집단의 체중(p=.003), BMI(p=.002), PWV(p=.017), 낙상위험도지수(p=.037)는 유의하게 감소하였으나 통제집단에서 체중(p=.009), BMI(p=.009)는 유의하게 증가하였다. 따라서 여성노인들은 탄력밴드 저항운동을 통해 체중과 BMI를 감소시키고 혈관탄성에 긍정적인 효과를 얻게 되었다. 그리하여 탄력밴드 저항운동은 노인들의 대사증후군, 심혈관질환, 낙상사고의 발생률을 낮출 수 있는 매우 효과적인 운동이라 할 수 있다.

• 한국생활과학회지
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• 제20권1호
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• pp.195-203
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• 2011

The purpose of this study was to define the effects of the finger temperature response according to the daily life of college student. For this study, 31 healthy female college students were taken as a subject group. To define the effects of the finger temperature response, housing style, subjective thermal sensations during daily life in the house and domestic working time were surveyed. The finger temperature response items were measured. The results were as follows. Strong, normal and weak group members were divided according to their cold resistance index(RI) 3, 8, 20 people, repectively. Subjective thermal sensations during daily life in the house affects the cold resistance index(p<.01). The cold resistance index(RI) got higher as domestic working time was increased(p<.05, F-value=3.927). The percentage wearing protective gloves during domestic work in the weak group was higher than the normal or strong groups. Subjective sensations during daily life and domestic working time effected the local cold tolerance, living in a comfortable environment continuously can weaken one's cold tolerance.