• Title/Summary/Keyword: Multiple regression equation

Search Result 487, Processing Time 0.033 seconds

Golfers' Intention to Adopt UV Specialized Clothing as Innovation: Based on Rogers Theory (골퍼의 자외선 차단의복의 수용 의도: Rogers의 혁신확산이론을 중심으로)

  • Sung Heewon;Slocum Ann C.
    • Journal of the Korean Society of Clothing and Textiles
    • /
    • v.28 no.12 s.138
    • /
    • pp.1554-1561
    • /
    • 2004
  • In the U.S., outdoor enthusiasts such as golfers have been focused on skin cancer prevention practices since their outdoor activities lead to extensive sun exposure during peak sun hours. The purposes of this study were to investigate golfers current sun protection behaviors and five attributes and their impacts on the intention to adopt UV specialized clothing based on Rogers' theory. UV specialized clothing as a preventive innovation is related to sun protection behaviors. However, there has been little effort to explain the intention to adopt a preventive innovation regarding health-related practices. With a convenience sampling method, a total of 158 useful questionnaires were collected. Ninety one percent were male golfers, and their age ranged from 16 to 80 years old(mean age=30 years). About $25\%$ reported to practice sun protection behaviors. About $70\%$ disagreed on the relative advantage, compatibility, observability, and triability of UV specialized shirts and reported the low intention to purchase it. Current sun protection behaviors and five attribute variables were entered in the multiple regression equation to explain the dependent variable of intention to adopt the innovation. Triability was the best predictor of the intention to adopt UV specialized shirts, followed by current sun protection behaviors, compatibility, and relative advantage. With four predictors, $45\%$ of the variance of intention to adopt was explained. The present study provides how the golfers current sun protection behaviors play important roles in explaining the intention to adopt the preventive innovation. Physical and functional features of UV specialized clothing were also significantly associated with their intentions to adopt it.

A Study on the Undrained Deformation Characteristics of Remoulded Marine Clay (재성형(再成形)한 해성점토(海成粘土)의 비배수(非排水) 변형특성(變形特性)에 관(關)한 연구(硏究))

  • Yoon, Hyun Jung;Kang, Yea Mook;Cho, Seong Seup
    • Korean Journal of Agricultural Science
    • /
    • v.12 no.2
    • /
    • pp.309-323
    • /
    • 1985
  • The Paper describes the observed behaviour in the undrained triaxial condition of marine clays remoulded at various different levels of factors, to find out the effects of restricted factors on the stress-strain characteristics. The conventional triaxial compression tests $({\sigma}1>{\sigma}2={\sigma}3)$ were carried out on the 50mm in diameter and 100mm long cylindrical specimens of Gun-san bay mud under controlled various moisture content, density, axial strain rate and passing on No. 200 sieve. Significant conclusions from this study are; 1. The compressible deviator stress at failure of pure marine clay was observed to increase with the decrease of moulding moisture content. 2. The compressible deviator stress at failure increased with the increasing of moulding dry density. 3. The interaction between moisture content and density on the stress-strain characteristics of marine clay was remarkedly significant, as the result of factorial experimental method. 4. The effect of axial strain rate on stress-strain behaviour was unsignificant in marine clay and but the secant moduli could be pronounced on a slight decreasing with increase of the strain rate. 5. With the increasing of the passing on No. 200 sieve, the deviator stress increased regularly. 6. The multiple regression equation could be modeled for the prediction of stress or strain and the comparison with experimental results relatively proved the accuracy.

  • PDF

The Influence of Soil Physico-Chemical Properties on Urease Activity in Paddy Soils (답토양(畓土壤)의 이화학적(理化學的) 특성(特性)과 Urease의 활성(活性))

  • Cho, Kang-Jin;Mun, Eul-Ho;Jung, Yeun-Tae
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.17 no.1
    • /
    • pp.77-81
    • /
    • 1984
  • Paddy soil samples were collected from the plow layers of 19 soil series distributed in Yeongnam district to determine the relationship between soil urease activity and other soil characteristics. The results obtained were summarized as follows: 1. Simple correlation analyses showed that the urease activity was positively related with available $P_2O_5(r=.844^{**})$, potassium activity ratio($r=0.762^{**}$), available $SiO_2(r=.580^{**})$ and $SiO_2$/O.M ratio($r=0.591^{**}$). 2. Among soil chemical properties which had positive linear correlations with soil urease activity, the content of available $P_2O_5$ in soil had the highest contribution to the multiple regression equation of soil urease activity. 3. The activity of soil urease was especially lower in sandy texture than in clayey paddy soils, and a tendency was observed that the heavier soil textures the higher activity of soil urease. 4. Relatively well drained soils had the higher activity of soil urease while the soils in "poorly drained" had remarkably lower activity of soil urease. 5. The soils in higher classes of paddy soil equitability group had higher activities of soil urease.

  • PDF

Study on the Adsorption of Antibiotics Trimethoprim in Aqueous Solution by Activated Carbon Prepared from Waste Citrus Peel Using Box-Behnken Design (박스-벤켄 설계법을 이용한 폐감귤박 활성탄에 의한 수용액 중의 항생제 Trimethoprim의 흡착 연구)

  • Lee, Min-Gyu;Kam, Sang-Kyu
    • Korean Chemical Engineering Research
    • /
    • v.56 no.4
    • /
    • pp.568-576
    • /
    • 2018
  • In order to investigate the adsorption characteristics of the antibiotics trimethoprim (TMP) by activated carbon (WCAC) prepared from waste citrus peel, the effects of operating parameters on the TMP adsorption were investigated by using a response surface methodology (RSM). Batch experiments were carried out according to a four-factor Box-Behnken experimental design with four input parameters : concentration ($X_1$: 50-150 mg/L), pH ($X_2$: 4-10), temperature ($X_3$: 293-323 K), adsorbent dose ($X_4$: 0.05-0.15 g). The experimental data were fitted to a second-order polynomial equation by the multiple regression analysis and examined using statistical methods. The significance of the independent variables and their interactions was assessed by ANOVA and t-test statistical techniques. Statistical results showed that concentration of TMP was the most effective parameter in comparison with others. The adsorption process can be well described by the pseudo-second order kinetic model. The experimental data of isotherm followed the Langmuir isotherm model. The maximum adsorption amount of TMP by WCAC calculated from the Langmuir isotherm model was 144.9 mg/g at 293 K.

Comparison of Grain Quality Traits between Japonica Rice Cultivars from Korea and Yunnan Province of China

  • Yu, Teng-Qiong;Jiang, Wenzhu;Ham, Tae-Ho;Chu, Sang-Ho;Lestari, Puji;Lee, Jeong-Heui;Kim, Myeong-Ki;Xu, Fu-Rong;Han, Longzhi;Dai, Lu-Yuan;Koh, Hee-Jong
    • Journal of Crop Science and Biotechnology
    • /
    • v.11 no.2
    • /
    • pp.135-140
    • /
    • 2008
  • Improving eating quality is one of the most important objectives in japonica rice breeding programs in Yunnan Province of China. Eating quality and its relevant traits of nine Korean and 11 Yunnan rice cultivars were comparatively analyzed in this study. The grain shape of most Yunnan japonica rice cultivars have a relatively slender shape and are slightly larger than Korean rice cultivars. Palatability value of cooked rice of Yunnan rice cultivars was significantly lower, while the protein content of Yunnan rice cultivars was significantly higher than that of Korean cultivars. Peak viscosity and breakdown viscosity of the Yunnan rice cultivars were significantly lower, while setback viscosity of the Yunnan rice cultivars was significantly higher than in Korean rice cultivars. Palatability value of cooked rice was negatively correlated with protein content and setback viscosity but positively correlated with peak viscosity, breakdown viscosity, and cool paste viscosity. Through multiple linear regression analysis, an equation for estimating palatability value(PV) of cooked rice based on quality traits was generated as dependent only upon protein content(PC), PV=139.024-(10.865$\times$PC) with an $R^2$ value of 0.822. The results suggest that reducing protein contents should be the major target in improving eating quality of Yunnan japonica rice cultivars through integrated approaches of both cultivar development and appropriate cultural practices. Genetic similarities among cultivars based on DNA markers which had been identified as associated with grain quality seemed not to be directly related to PV.

  • PDF

Effect of Water Addition and Heating on Textural Properties of Uncompressed SPI Tofu (비압착 분리대두단백 두부의 물리적 특성에 미치는 가수량과 가열조건의 영향)

  • Ku, Kyung-Hyung;Kim, Dong-Won;Kim, Woo-Jung
    • Korean Journal of Food Science and Technology
    • /
    • v.26 no.1
    • /
    • pp.31-36
    • /
    • 1994
  • In order to prepare SPI tofu without compression step, amounts of water added to SPI suspension was studied for textural properties of uncompressed SPI tofu prepared by first heating at $100^{\circ}C$ for 6 minutes and second heating at $75^{\circ}C$ for 25 minutes and use of $CaSO_{4}-GDL$(0.07g, 0.0075 g/g SPI) as coagulants. The hardness and uniformity were gradually increased as the water addition ratio $(gH_{2}O/g\;SPI)$ raised from 6.0 to 8.0 and cohesiveness was rather decreased. The increase in second heating time increased the hardness and gumminess and relativity higher values in hardness were measured for those tofu heated at $85^{\circ}C$ than those at $75^{\circ}C$ or $95^{\circ}C$. A multiple regression equation calculated and RSM figure showed that the effects of water addition ratio was become to be less as the heating time and temperature increased. Addition of 8 g of water per g SPI and second heating at $85^{\circ}C$ for $30{\sim}60$ minutes were found as optimal conditions to prepare uncompressed SPI tofu.

  • PDF

Influencing and Mediating Factors in Stroke: Based on 2007-2012 Korea National Health and Nutrition Examination Survey (뇌졸중의 영향 요인과 매개요인)

  • Bae, Seung-Geun;Lee, Sung-Kook;Han, Chang-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.16 no.1
    • /
    • pp.418-428
    • /
    • 2015
  • This study conducted influencing and mediated effect on stroke to lead correct health behavior of stroke patients and tried to provide preliminary data of stroke prevention. It used stage 4 and 5 data of a national health and nutrition examination survey, analysis method was frequency analysis, Chi-square test, multiple logistic regression and structural equation modeling. In case of male, factors affecting to stroke were age, job, self-related health, alcohol, hypertention and diabetes. In case of female, age, job, self-related health, stress level and hypertention affected to stroke. In tested results on whether or not mediated effect of preceding disease exists, 5.80 difference in ${\chi}^2$ between partial mediated modeling and full mediated modeling was statistically significant(p<0.01). Therefore, partial mediated modeling was adequate to this study. We need preventive health education for changing wrong health behaviors and policy that strengthens health care network. If someone has preceding disease, they need long-term diagnosis for health condition and continuous improvement in life style.

Leaf Growth and Forage Yield in Three Cultivars of Orchardgrass (Dactylis glomerata L.) over Cutting Stages II. Relationship between forage yield and growth indices (오차드그라스(Dactylis glomerata L.) 品種들의 刈取에 따른 葉生長과 收量形成 Ⅱ. 오차드그라스 品種들의 生長指數들과 乾物收量과의 關係)

  • Lee, Ho-Jin;Kim, Hoon-Kee
    • Journal of The Korean Society of Grassland and Forage Science
    • /
    • v.8 no.2
    • /
    • pp.110-116
    • /
    • 1988
  • The response of forage yield was studied with various growth indices to develop yield model and to determine optimum cutting time in three cultivars of orchardgrass. 1. Number of tiller per plant was the highest at 3rd cutting stage. But, it was decreased rapidly at 4th cutting stage. Leaf Area Index (LAI) was the highest at 3rd cutting stage. LAI was increased slowly during 15 days to 20 days after cutting and thereafter increased rapidly. 2. In dry matter yield over cutting stages, 1st cutting and 3rd cutting stages were higher yield than others. Change of dry matter yield was similar to that of LAI in all cutting stages. 3. Leaf Elongation Rate (LER) and Specific Leaf Weight (SLW) were reached to maximum at 20 to 25 days and 25 to 30 days after cutting, respectively. 4. Dry matte yield was highly correlated with LAI (r-0.905)and with CGR (r-0.962) over three cultivars. Also, LAI was significantly with LER. The best-fit yield model was obtained in multiple regression equation which included both dependent variables of LAI and CGR. 5. Optimum cutting times which were determined by the relationships between D.M. yield and LAI, and between D.M. yield and CGR, were ranged from 32 days to 36 days depend on each cutting stages.

  • PDF

Statistical Optimization for Biodegradation of 2,4-Dichlorophenoxyacetic Acid by Soil Isolated Bacterium (토양 분리 박테리아에 의한 2,4-Dichlorophenoxyacetic산의 분해 최적화)

  • Kim, Byunghoon;Myunghee Han;Sungyong Cho;Sungjin Ahn;Lim, Sung-Paal;Sunkyun Yoo
    • Microbiology and Biotechnology Letters
    • /
    • v.31 no.1
    • /
    • pp.83-89
    • /
    • 2003
  • 2,4-Dichlorophenoxyacetic acid (2,4-D) as a widely used herbicide has caused serious environmental problems because of its difficult decomposition in nature. We isolated the strain capable of metabolizing 2,4-D as sole carbon and energy source by an enrichment culture technique from the 2,4-D contaminated soil collected at orchard in Gwangju, Korea. This strain was identified tentatively as Aeromonas sp. NOH2. With this strain, we established the response surface methodology (Box-Behnken Design) to optimize the principle parameters for maximizing biodegradation of 2,4-D such as culture pH, temperature, and nutrient concentration in liquid batch culture. The ranges of parameters were obtained from preliminary works done at our laboratory and chosen as 5.5, 6.5, and 7.5 for pH, 25, 30, and $35^{\circ}C$ for temperature, and 5, 20, and 35 g/1 nutrient concentration. Initial concentration of 2,4-D was 500 ppm and nutrient source was tryptic soy broth. The experimental data were significantly fitted to a second order polynomial equation using multiple regression. The most important parameter influencing 2,4-D degradation and biomass production was nutrient concentration. For 2,4-D degradation, the optimum values of pH and temperature, and nutrient concentration were obtained at pH (6.5), temperature (31.8 to $32.1^{\circ}C$), and nutrient concentration (29.6 to 30.1.0 g/1).

Analysis of the Influence of Hopelessness, Psychosocial Stress and Depression on Suicide Ideation Among Middle School Students Using the Structural Equation Model (구조방정식모형을 이용한 중학생의 절망감, 사회심리적스트레스 및 우울이 자살생각에 미치는 영향 분석)

  • Bae, Sang-Yun;Cho, Young-Chae
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.15 no.6
    • /
    • pp.3685-3695
    • /
    • 2014
  • This study was performed to determine the suicide ideation and its association with hopelessness, psychosocial stress and depression among some middle school students. The survey was administered to 975 middle school students in Gyeongin area during the period, May $1^{st}$ to June $30^{th}$, 2013. Structured self-administered questionnaires were delivered and collected without the respondents' personal information. As a result, concerning the correlation of depression with various factors, the level of suicide ideation was positively correlated with hopelessness, psychosocial stress and depression. Multiple linear regression analysis showed that the factors influencing the suicide ideation included sex distinction, experience of alcohol drinking, hobbies and leisure life, subjective health status, grade, school violence experience, hopelessness, psychosocial stress and depression. An analysis of the covariance structure, hopelessness (BHOP) was more influential on the suicide ideation than psychosocial stress (PWI) and depression (CES-D). The study found that higher hopelessness, severe distress and higher depression tends to increase the suicide ideation.