• Korean Journal of Fisheries and Aquatic Sciences
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• v.42 no.1
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• pp.83-88
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• 2009

The purpose of this paper is to obtain the fundamental data on the catch fluctuation in the pound set net according to the tide age from the catch recorded from the year 1997 to 2004 in the coastal waters of Guideok, Jeju. Total catch by the pound set net had a little connection with the tide age. During increasing tide, total catch were reduced slightly from the neap tide to the high tide while there seemed to be a little sign of rise in the total catch until decreasing tide. But in the relation between the catches and the tide age, the level of the correlation coefficient chosen at $p{\le}0.05$ was not significant. Therefore, the catch of the pound set net seemed not to be influenced by the tide age. In addition, CPUE at the high tide was higher than that at the neap tide. When the catch per operating frequency was graded in the order under 50 kg, 50-100 kg and 100-200 kg, the frequency rate by the pound set net was 38%, 19% and 19%, respectively.

• Journal of the Korean Society of Physical Medicine
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• v.14 no.4
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• pp.1-8
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• 2019

PURPOSE: The purpose of this study was to compare the maximum knee strength and endurance of elderly Korean women with Kellgren-Lawrence grade (K-L II) by age. METHODS: In this study, the total number of participants was 50, divided into five groups of 10 by age. Maximum knee muscle strength was measured at a low speed of 60°/sec using Biodex, an isokinetic device for comparison of maximum knee muscle strength, whereas muscle endurance was measured by muscle contraction at a high speed of 180°/sec. The peak torque values of the extensor and flexor muscles in the muscle strength and muscle endurance tests were collected according to each classification. RESULTS: The results of the experiment show that maximum muscle strength and muscle endurance decreased significantly at 60°/sec and 180°/sec during flexion and extension according to age (p<.05). In particular, the age group of 71 to 75 years showed the most significant correlation with other age groups (p<.05). CONCLUSION: The results of this study can be used as basic data for increasing physical activity and muscle strength in women with knee osteoarthritis.

• Journal of Nutrition and Health
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• v.29 no.9
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• pp.1035-1041
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• 1996

The study was undertaken to examine the levels of serum lipids and the correlations between serum lipid levels and other factors(nutrient intakes, anthrometric measurement, blood pressure, drinking, smoking). The participants in this study were healthy volunteers over the age of 40 residing in Whachon area, Kang-Wan Do. The level of serum TG was higher in males than in females, particularly in age of 40(209.8mg/dl$\pm$154.9, p<0.05). The HDL-c/total cholesterol ratio(HTR) in males was the lowest(0.23$\pm$0.07, p<0.05) in age of 40 and in females was the lowest(0.25$\pm$0.1) in age of 60 and over. LDL-c/HDL-c ratio(LHR) was the highest (males 3.64$\pm$6.29, females 3.28$\pm$3.03) in age of 40 in both sexes. In the age of 40-59, serum TG, total cholesterol and LDL-cholesterol and HDL-cholesterol tended to increase with BMI. Serum TG showed positive correlation with drinking (r=0.026, p<0.001) and BMI (r=0.2096, p<0.01). BMI was negatively correlated with HTR(r=-0.2242, p<0.01) and HDL-cholesterol (r=-0.2054, p<0.01).

• Proceedings of the KSRS Conference
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• v.1
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• pp.94-97
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• 2006

Timber stand age information of timber in industrialized plantation forest is generally collected by field surveying which is labor-intensive, time-consuming, and very costly. It is also inconsistent in analyses perspective. As an alternative, The objective of this research is to present a practical solution for estimating timber age of loblolly pine plantation using Landsat thematic mapper (TM) images, shuttle radar topography mission (SRTM), and national elevation dataset (NED). A multivariate regression model was developed based upon satellite image-based information (i.e.normalized difference vegetation index (NDVI), tasseled cap (TC) transformation, and derived tree heights). A residual studentized technique was applied to remove potential outliers. After that, a refined age estimation model with a correlation coefficient R-square of 84.6% was obtained. Finally, the feasibility test of estimated model was performed by comparing estimated and measured stand ages of timber plantations using test datasets of plantation stands (2,032 stands). The result shows that the proposed method of this study can estimate loblolly pine stand age within an error of $2{\sim}3$ years in an effective and consistent way in terms of time and cost.

• Korean Journal of Adult Nursing
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• v.24 no.4
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• pp.339-347
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• 2012

Purpose: The purpose of this study was to identify the influencing factors on health related quality of life in middle age. Methods: Data were as collected by self-reported questionnaires from 303 middle age adults. Data analysis was done using SPSS/WIN 17.0 program for descriptive statistics, Pearson correlation coefficients and stepwise multiple regression. Results: The average score of health related quality of life was $79.50{\pm}0.40$. Health related quality of life was statistically significant differences according to gender, education, economic status and disease. The health related quality of life was significantly correlated with fatigue, depression, stress, social support, somatic attribution, psychological attribution, normalizing attribution and type D personality. The major factors that affect health related quality of life in middle age were stress, fatigue, type D personality and normalizing attribution, which explained 51.3% of health related quality of life. Conclusion: The findings can provide the basis for the development of nursing interventions to improve health related quality of life. Furthermore, more studies are needed to explore variables that influence on the health related quality of life in middle age.

• Child Health Nursing Research
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• v.24 no.1
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• pp.18-26
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• 2018

Purpose: Quality of life is important to everyone including school-age children. Therefore this study was done to identify the effects perceived daily stress and sense of humor on quality of life for these children. Methods: The study was a cross-sectional, descriptive study design with 371 participants from 5th and 6th grade children in 5 elementary schools. Data were analyzed using descriptive statistics, t-test, ANOVA, Pearson correlation coefficients, and multiple regression analysis with SPSS/WIN 24.0 program. Results: Factors influencing quality of life in school-age children were daily stress, sense of humor, satisfaction with daily life, academic performance and home atmosphere. These variables explained 63.0% of quality of life in school-age children. Conclusion: Results showed that lower daily stress and higher sense of humor are associated with higher quality of life. Therefore, to improve quality of life in school-age children, healthcare providers should develop intervention programs considering these factors.

• Journal of Korean Society of Forest Science
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• v.99 no.2
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• pp.213-219
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• 2010

Early results from a field trail of Agathis loranthifolia are reported from a progeny test of 100 open-pollinated families in west Java, Indonesia. The average of height and diameter at root collar (DRC) was 40.18 cm and 0.52 cm at age 15 months. Family survival rate ranged from 86.5% at age 10 months to 81.7% at age 15 months. Family means of 10 best and 10 poorest families for each trait indicated that there was a large difference of growth performances among individual families. For height and DRC growth, the poorest groups had averages of 33.98 cm and 0.43 mm while the averages of the best groups were 47.35 cm and 0.62 mm at age 15 months as a difference of 39.36% and 43.65%, respectively. Differences between the best group and the test population mean, which is the selection differential, were implying that genetic gain from selection for the improvement of height and DRC growth would be achieved. The family variances of DRC and height were relatively small compared to replicate and residual variances. Family heritabilities for both studied traits were fluctuated, and the genetic coefficients of variation for DRC and height at age of 15 months were 7.19% and 5.22%, respectively.

• Journal of Family Resource Management and Policy Review
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• v.15 no.2
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• pp.85-101
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• 2011

The purpose of this study is to ascertain the actual conditions of volunteering activities in respect to age-integrated leisure. This study is based on the 2010 Korea Leisure Life Survey. The participants in this study were 3015 people who reside in Korean cities, except for Jeju-do. Questionnaires from the 2010 Korea Leisure Life Survey were used for the final analysis. Data were analyzed through a descriptive analysis, Chi-Square test and ANOVA by SPSS WIN 17.0. The findings indicated that 18% of the participants participated in volunteer activities as leisure in the last one year. The major findings were as follows. First, demographic characteristics such as age, academic career, income, and marital status had a positive correlation with the degree of volunteer participation. Second, there were differences in duration and field of activities according to age. Third, though most of the non-volunteer reasons were 'lack of resources', there were different reasons based on age. In detail, the reason for 10-50 year-olds (economically active population) was 'lack of time', but the more than 60 year-olds was 'health concern'. Consequently, this access to the life cycle study shows the need to improve life satisfaction.

• Journal of the Korean Society of Clothing and Textiles
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• v.20 no.1
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• pp.28-42
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• 1996

The purposes of this sturfy were 1) to examine the difference between cognitive and actual age, 2) to understand apparel shopping orientations and the importance of store attributes related to cognitive age and 3) to identify relationship.; between apparel shopping orientations and importance of store attribute, ; in cognitively younger and older groups For the study, questionnaires were administered to 450 elderly women over 55 years of age. The questionnaires were designed to mea, ;ore apparel shopping orientations (hedonic, store loyal and brand conscious, careful and planned, confidented and independent, and economic shopping), importance of store attributes, cognitive age and demographics. Using a base of 204 women, data was analyzed by using descriptive statistics, t-test and correlation coeffictents. The results of this study weve summarized as follows. 1. The older women saw themselves on average 6. 6 years younger than they really were 77.6% of the respondents blieved themselves to be cognitively younger 2 Cognitively younger women were more hedonic and less carefull and planned than cognitively older women in apparel Shopping. 3. Cognitively older women thought that proximity and private dressing rooms in apparel stores were mote important attributes than cognitively younger women. In terms of apparel store attributes, older consumers placed importances on product quality, fit and size, design suited to their age, attractive price, and the availability to return unsatisfactory products, in orders.

• Journal of the Korean Society of Physical Medicine
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• v.9 no.3
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• pp.301-305
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• 2014

PURPOSE: The purpose of this study was to determine the optimal thresholds of serum lipid level related to hypertension according to age in Korean adults. METHODS: In total, 564 adults who visited the health examine center in general hospital were included. The blood pressure and lipid profiles of low density lipoprotein cholesterol(LDL), high density lipoprotein cholesterol (HDL), triglyceride(TG) were measured. Receiver operating characteristic (ROC) curve were used to establish optimal thresholds between blood pressure and lipid profiles. RESULTS: The optimal TG cutoff value were 110.50(mg/dl) in the 18-39 and 81.50(mg/dl) in the 40-59 age group, and optimal cutoff value of LDL were 126.50(mg/dl) in the 40-59 age group and 111.00(mg/dl) in the 60 and over age group. There was a negative correlation between HDL and hypertension, a higher HDL decreased hypertension. The optimal cutoff value of HDL was 49.50(mg/dl) in the 18-39 age group. CONCLUSION: The thresholds of hypertension were lower in LDL and TG with aging. This result indicated that elderly people needs to concern more about their lipid profiles to maintain healthy cardiovascular function.