• The Journal of Korean Physical Therapy
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• 제15권4호
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• pp.466-478
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• 2003

This study was to evaluate the body composition and bone mineral density according to aging in adult and investigated the relationship between various parameters such as body mass index(BMI), bone mineral density(BMD), bone mineral content(BMC), lean body mass(LBM), fat mass(FM) and the value obtained from dual energy X-ray absorptiometry(DEXA). The subjects were composed of healthy adult male and female who were $20^{\sim}73$ years old and they were divided three group according to age (A group : 20-39 yrs., B group : 40-59 yrs., C group : more than 60 yrs.). The conclusion derived from statistical analysis was as follows : 1. Bone mineral content and density were significantly affected by lean body mass(relatively, R=0.85 - 0.63). 2. There was significant difference among age groups in total bone mineral density. 3. There was significant difference among age groups in bone mineral content of male and female. 4. Lean body mass is diminished according to age, but there was not significant difference among age groups. 5. Fat mass of A group in male had the highest mass and followed by C group and B group. In female groups, fat mass of A group had the highest mass and followed by B group and C group. Abdominal fat mass is increased according to age. This result suggest that aging was closely relation with loss of muscle mass, bone mineral density and bone mineral content.

• 펄프종이기술
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• 제46권6호
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• pp.41-49
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• 2014

The research was performed to investigate the weathering characteristics of fruit growth paper bags. The bags were used to cover fruits such as grapes and pears. And then they were collected after 30 and 60 days exposure at the orchard. The physical and optical properties of the bags tended to decrease with the exposure times. The larger change on the properties were found on the papers exposed for 30 days. The cover paper for pear showed the largest density changes. The air permeability were decreased with the exposure time in all bags. The cover paper for pear showed the very low values of air permeability. The mechanical properties of the fruit bags showed to be gradually decreased with the length of exposure time. The tear index showed the largest differences. The cover paper for pear showed the rapid decrease on the mechanical properties after 60 days of the exposure. The inner paper, however, showed the strength enough to cover the fruits. The precipitation showed more effect on the degradation of fruit growth paper bags than the light hours.

• 폴리머
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• 제26권4호
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• pp.452-461
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• 2002

본 연구에서는 폴리아미드 6 (PA 6)을 70~$160^{\circ}C$에서 장시간 사용하였을 때 산화방지제의 사용유무 및 농도에 따른 열 안정성을 조사하였다. 70~$160^{\circ}C$의 온도범위내의 열 산화반응 시 모든 시료는 100시간 내에 황변 현상이 일어났다. 기계적 물성, 황변 지수, 점도측정으로 가장 적정한 산화방지제의 농도를 조사하였다. 일, 이차 산화방지제의 조성변화에 의한 산화방지효과는 미미하였다. 황변 현상의 분석은 NMR, IR, 그리고 element analysis (EA)를 사용하였다. $^{13}C$ NMR에 의해 서로 다른 카르보닐기의 존재를 확인하였으며, 산소의 소모량 측정은 EA를 사용하였다. Arrhenius식을 이용하여 산화방지제를 첨가한 시료와 그렇지 않은 시료의 lifetime을 예측하였다.

• 대한디지털의료영상학회논문지
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• 제14권2호
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• pp.63-67
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• 2012

Calcium density in human bones decreases as people are getting older due to the interior or exterior environmental factors. Bone aging forms osteoporosis. And this can bring out various spine fractures which develops a complications. Thus the prediction of seniliy is one of the important factors in spine diseases. Once spine aged, diverse fractures occur such as compression fracture and micro fracture. Side images of the spine by the digital radiography (DR) were prepared, and pixel arbitrary unit with Image J was measured from one spot in the lumbar bone part. By calculating pixel arbitrary unit of the simple contrast, it was obtained that the value of pixel arbitrary unit decreased as seniliy of bones increased. By simply applying Image J to the seniliy of patient's spine, the seniliy of bones predicts the level of danger with only digital radiography(2D) image. consequently we show that Image J value of pixel arbitrary unit index for predicts the level of precaution of osteoporosis patient.

• Toxicological Research
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• 제30권4호
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• pp.283-289
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• 2014

Tea flavonoids and polyphenols are well known for their extraordinary antioxidant activity which is considered important for anti-aging processes in animals. This study evaluated the anti-wrinkle effects of three different kinds of tea (Camellia sinensis) water extracts (CSWEs) including green, white, and black teas using a photoaged hairless mouse model. Data showed that the CSWE-treatment greatly improved skin conditions of mice suffering from UVB-induced photoaging, based on the parameters including the skin erythema index, moisture capacity, and transepidermal water loss. In addition, the wrinkle measurement and image analysis of skin replicas indicated that CSWEs remarkably inhibited wrinkle formation. In histological examination, the CSWE-treated mice exhibited diminished epidermal thickness and increased collagen and elastic fiber content, key signatures for skin restoration. Furthermore, the reduced expression of MMP-3, a collagen-degradative enzyme, was observed in the skin of CSWE-treated animals. Interestingly, comparative data between green, white, and black tea indicated that the anti-wrinkle activity of white tea and black tea is equally greater than that of green tea. Taken together, these data clearly demonstrated that CSWEs could be used as an effective anti-wrinkle agent in photoaged animal skin, implying their extended uses in therapeutics.

• 한국산학기술학회논문지
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• 제12권12호
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• pp.5518-5524
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• 2011

사람이 서있는 동안의 안정성 감소는 낙상에 영향을 끼치는 요인 중 하나이다. 따라서 본 논문은 낙상 발생률이 높은 65세 이상의 노인여성을 대상으로 균형기능 검사를 실시하고, 성인여성의 연령대별 비교를 통해 균형능력이 노화에 따라 변화해가는 정형외과 및 신경학적 요인들을 밝혀 낙상을 예방하고자 한다. 연구 대상자는 보조기나 약물복용 없이 독립보행이 가능한 65세 이상의 신체 건강한 노인여성 10명(평균연령: 71.9세)과 성인여성 10명(평균연령: 23.2세)으로 하였다. 균형능력 평가장치(Tetrax)를 이용하여 8가지 자세에 대한 안정성 지수(Stability Index, ST), 푸리에 지수(Fourier index, F), 체중분표(Weight Distribution (%), WD), 체중분포율 지수(Weight Distribution Index, WDI), 동기화 지수(Synchronization Index, SI), 낙상율지수(fall index, FI)를 측정하였다. 그 결과, 안정성 지수(ST)는 노인여성과 성인여성간 PO를 제외한 모든 자세에서 통계적으로 유의한 차이를 나타냈다(p<.01) 푸리에지수는 낮은주파수(low, F1)에서 PO를 제외한 모든 자세에서 노인여성과 성인여성은 유의한 차이를 나타냈다(p<.01). 또한 중간낮은 주파수(middle-low, F2-F4), 중간높은주파수(middle-high, F5-F6), 높은주파수(high, F7-F8) 모두에서 노인여성이 성인여성보다 통계적으로 유의하게 높은 수치를 나타냈다. 모든 자세에서 노인여성의 체중분포율지수가 더 높게 나타났으나, PO와 PC에서만 통계적으로 유의했다. 이는 노화에 따른 생리학적 변화로 체성감각기관, 전정기관, 중추신경계등 전반적인 부분에서 능력이 저하됨에 따라 나타난 것으로 사료된다.

• Journal of Acupuncture Research
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• 제19권3호
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• pp.126-137
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• 2002

Objective : There is accumulating data that cardiovascular diseases, including hypertension, cerebro-vascular accident, coronary heart disease, relate to atherosclerotic changes. Increased serum levels of lipids could play a role in these circumstances. the SDPTG(the second derivative of photoplethysmogram waveform) is noninvasive methods for evaluating the pulse wave and is correlated with age and other risk factors for atherosclerosis. Methods : To study the effects of serum lipid levels on the SDPTG in the middle-age adults, data on serum lipid levels and the SDPTG were collected in 80 healthy middle age with varying serum lipid concentrations. Biological vascular age was assessed using the SDPTG. the SDPTG consists of an a, b, c, and d wave in systole and an e wave in diastole; an SDPTG aging index(Al) was calculated as (b-c-d-e)/a. Results : Serum triglyceride, total cholesterol, total lipid, phospholipid, HDL cholesterol levels were respectively and significantly correlated with SDPTG Al. Serum lipid levels and blood pressure are age-dependent and the SDPTG is blood pressure-dependent. Restricting analysis to age and blood pressure yield strong positive correlations between serum triglyceride, total lipid levels and SDPTG Al, but no correlations between serum total cholesterol, phospholipid levels and SDPTG Al. Conclusion : The results of this study suggest that preventive acupuncture programs or herbal medications for reducing serum lipid, especially triglyceride, levels in middle-age should include a evaluation of biological vascular aging with the second derivative of photoplethysmogram waveform.

• 한국재료학회지
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• 제14권10호
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• pp.713-718
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• 2004

To study the dynamic strain aging behavior of Zr-0.4Sn-1.5Nb-0.2Fe sample tube for nuclear fuel cladding in the range of pressurized water reactor (PWR) operation temperature, the tensile tests of the tube specimens, which had been finally heat-treated at $470^{\circ}C\;and\;510^{\circ}C$, had been carried out with the strain rate $1.67{\times}10^{-2}/s\;and\;8.33{\times}10^{-5}/s$ at the various temperatures from room temperature to $500^{\circ}C$. It was observed that the elongation of the specimens got shortened as the temperature increased from $200^{\circ}C\;to\;340^{\circ}C$. The specimens that were finally heat-treated at $470^{\circ}C$ showed a plateau more remarkably on the plot of yield strength-temperature than those heat-treated at $510^{\circ}C$. In the range of $310\sim400^{\circ}C$, the strain rate sensitivity of the specimens finally heat-treated at $510^{\circ}C$ was $30.4\%\sim33.7\%$ lower but the work hardening exponent index of the specimens was a little higher than that without dynamic strain aging effect.

• 한국축산식품학회지
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• 제21권4호
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• pp.329-336
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• 2001

도축후 하루동안 냉장한 상등급육(B2 등급)과 등외등급육(D 등급)에서 등심부위를 분할하여 두쪽으로 나누고 한쪽은 랲으로 싸서 1일간 냉장하고 (신선육), 다른 한쪽은 500g씩 자르고 11일간 냉장(숙서육)하였다. 상등급육과 등외등급육의 숙성효과를 파악하기 위하여 신선육과 숙성육의 pH, 유산함량, 비단백태 질소 화합물, 경도, 저작성, 근원섬유 소편화도, 유리 아미노산, 지방산 및 가열감량을 측정하였다. 신선육의 경우 상등급육이 등외등급육에 비하여 pH 및 유산함량이 낮았다. 상등급육의 경도 및 저작성은 등외등급육보다 낮으면서 근원섬유소편화도는 높았다. 그리고 상등급육의 총유리아미노산은 등외등급육보다 많았다. 상등급육은 포화지방산 함량이 낮고 포화지방산에 대한 단일불포화지방산의 비율(MUFA/SFA)이 높았다. 숙성육의 비단백태 질소화합물은 신선육보다 높았으며, 상등급육이 등외등급육보다 낮았다.

• 대한의생명과학회지
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• 제3권2호
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• pp.161-168
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• 1997

나이가 들어가면서 나타나는 여러 가지 변화를 임상적으로 검사하고 측정하므로써 건강상태를 예측하는 것은 노화를 지연시키고 건강한 삶을 유지하는데 상당히 유용하고 기초적인지표가 될 것이다. 점차 증가일로에 있는 노인성 질환의 여러 문제점을 해결하기 위해 노령인구 집단을 정상군과 치매군으로 구분하여 13종의 임상화학 검사를 시행한 결과, 두 집단 사이에서, 임상 생화학적 검사의 양상이 다를 것이라는 예측대로의 결과를 얻을 수 있었다. 즉, serum albumin, APase, glucose, GOT, LDH 등의 수치는 정상군과 치매군 사이에서 현저한 차이를 보이는 반면, bilirubin, BUN, cholesterol, creatinine, total protein 등의 검사 수치에서는 별다른 차이를 볼 수 없었으며 , 그밖에 calcium, GPT, Pi 검사 등의 결과에서도 두 집단 사이에서 차이를 보였다. 이것은 치매가 체내에서 많은 생화학적 변화를 일으킴을 시사하고, 치매 발병에 여러 가지 환경 요인이 영향을 미치게 될 것이라는 결론을 유도할 수 있게 한다.