• Journal of Biosystems Engineering
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• v.26 no.4
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• pp.371-378
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• 2001

This research devoted to develop an incubator that could make an optimum environment condition according to days of age for suckling pigs to decrease the mortality and improve the rate of the weight gain of the suckling pigs. Results obtained from this research summarized as follows: 1. Several experiments were carried out at the farm to find the effect of incubator developed for suckling pigs on weight gain by season. The total average gain of the weight of the treatment group was around 6∼22kg, and 6∼23kg higher than control group at the first experiment (April 19), at the second (July 30), and at the third (September 23), year of 2000 experiment, respectively. There were no significant differences ($\alpha$=5%) of the total weight gain among treatment groups. There was, however, a significant difference ($\alpha$=5%) of the total weight gain between the control and treatment groups and it was considered to be that the incubator had efficiency for weight gain of the suckling pigs. 2. The survival rate of the control group was 87% in the total sample number of 92, meanwhile, which of the experiment group was 98% in the total sample number of 50 suckling pigs. 3. Finally, economic analysis was executed for suckling pigs based on a farm size of breeding 500 sows. The results showed that a break-even point was around 9 months and the annual profit of ￦52,265,694 was expected after the break-even point.

• Wind and Structures
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• v.38 no.2
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• pp.147-160
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• 2024

The aerodynamic force is a significant component that influences the stability and safety of structures. It has unstable properties and depends on computer precision, making its long-term prediction challenging. Accurately estimating the aerodynamic traits of structures is critical for structural design and vibration control. This paper establishes an unsteady aerodynamic time series prediction model using Long Short-Term Memory (LSTM) network. The unsteady aerodynamic force under varied Reynolds number and angles of attack is predicted by the LSTM model. The input of the model is the aerodynamic coefficients of the 1 to n sample points and output is the aerodynamic coefficients of the n+1 sample point. The model is predicted by interpolation and extrapolation utilizing Unsteady Reynolds-average Navier-Stokes (URANS) simulation data of flow around a circular cylinder, square cylinder and airfoil. The results illustrate that the trajectories of the LSTM prediction results and URANS outcomes are largely consistent with time. The mean relative error between the forecast results and the original results is less than 6%. Therefore, our technique has a prospective application in unsteady aerodynamic force prediction of structures and can give technical assistance for engineering applications.

• Magazine of the Korean Society of Agricultural Engineers
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• v.21 no.1
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• pp.53-62
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• 1979

Since the first installation of irrigation Systems in Korea , a large number of small and medium sized reservoirs have been constructed as the main water sources Some 412, 000 ha are at present irrigated from these sources of supply. Many of the reservoirs were designed in accordance with old low standards and have in addition suffered a loss in capacity through sedimentation. At the same time, water demand has increased with the in troduction of high yielding varieties of rice. The combination has resulted in severe water deficits. To study the problem, 16 sample reservoirs have been surveyed and analysed. The results of the study are summarized be low: 1. Average decrease in reservoir capacity from the installation to present-8% 2. Average soil erosion loss (m$^3$/km$^2$/year) is 536 m$^3$/km$^2$/year and average erosion depth of soil is 0. 5mm per year. 3. No relationship, between reservoir capacity per unit of watershed (m$^3$/km$^2$) and soil erosion loss was found. 4. Increases are required in reservoir capacity: 15.8% due to the introduction of HYV's; 16.6% due to the change of system losses from 10%to 25% The conclusion to be drawn from the above results is that existing reservoir capacity should be increased by an average of 32%. The unit storage capacity to be adopted should be 661 mm

• The Korean Journal of Ecology
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• v.25 no.1
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• pp.51-58
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• 2002

An investigation of occurrence and distribution of dictyostelid cellular slime molds in South Korea were carried out. Thirty-one dictyostelid cellular slime molds were isolated from soils of 256 sample sites of 41 area within mountain forests, riversides, streamsides and coastal area in South Korea. The average number of species isolated at a given study area was 6.85. Based on the distribution value calculated from average frequency and site presence, four dictyostelid species distributed widely in South Korea; Polyspondylium pallidum, P violaceum, Dictyostellium mucoroides and D. minutum. Especially, P pallidum. were found in 30 area and the highest site presence. Eight dictyostelid species was described firstly in this study: D areum var. luteolum, D. delicatum, D. deminutivum, D. implicatum, D. microsporum, D. mucoroides var. stoloniferum, D septentrionalis, and P. candidum.

• Journal of the Korean Home Economics Association
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• v.35 no.2
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• pp.95-110
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• 1997

The purpose of this study were 1) to identity housing fund by the type of housing mobility and 2) to analyze the variable contributing to housing fund by the type of housing mobility. For these purposes, the 1993 KHPSD data was used and the sample in this study consisted of 2,796 couple households. Statistics employed for the analysis were frequencies, means, univariate analysis and multiple regression analysis. As the results, the composition and the amount of housing fund according to the type of housing mobility, were different respectively. Housing fund was consisted of previous housing sales price, savings deposits, loans, inheritance, subsidy, and personal debts. Households who already own houses used housing finance for their housing fund easily while renters were at a disadvantage to use housing finance. Moreover, among the contributing factors, home ownership, number of family member, residence, average monthly income, average monthly expenditure, husband's education attainment, satisfaction with housing, husband's job, and the type fo housing were positively associated with the amounts of housing funds. However, duration fo residence tended to negatively related to the amounts of housing funds.

• Communications for Statistical Applications and Methods
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• v.25 no.4
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• pp.431-442
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• 2018

This paper highlights the computational explosion issues in the autoregressive moving average approach of frequency estimation of sinusoidal data with a large sample size. A new algorithm is proposed to circumvent the computational explosion difficulty in the conditional least-square estimation method. Notice that sinusoidal pattern can be generated by a non-invertible non-stationary autoregressive moving average (ARMA) model. The computational explosion is shown to be closely related to the non-invertibility of the equivalent ARMA model. Simulation studies illustrate the computational explosion phenomenon and show that the proposed algorithm can efficiently overcome computational explosion difficulty. Real data example of sunspot number is provided to illustrate the application of the proposed algorithm to the time series data exhibiting sinusoidal pattern.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.5 no.7
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• pp.29-32
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• 1982

On designing the rectifying inspection plans of double sampling, the relations of the sample sizes $n_1$, $n_2$ and the acceptance numbers $c_1$, $c_2$ are obtained by using the Chi-square distribution. As the average number of pieces inspected per lot is a function of $c_1$ and $c_2$, the optimal solution is the values of $c_1^*$ and $c_2^*$ for which the average amount of inspection is a minimum. Then the values of $n_1^*$ and $n_2^*$ are easily obtained from the equations given by ($n_1$, $n_2$) and ($c_1$, $c_2$).

• Asian-Australasian Journal of Animal Sciences
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• v.7 no.1
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• pp.19-29
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• 1994

The annual income (gross margin) in 1989/90 of a sample of 274 farmers in seven milk cooperatives was analyzed in the sugar cane, cassava, and horticulture areas in East Java. On average dairying contributed 42%, crops 29% and off-farm revenue 29%. Dairy income was highest in the cassava area, where it compensated for the low crop income, and lowest in the sugar cane area. Farm area and average milk yield per day per cow correlated positively with farmer's income, whereas crop income increase significantly with farm area and with the number of cows. The level of total cost per cow had a negative impact on dairy and with the number of cows. The level of total cost per cow had a negative impact on dairy and on total income. Government officials and other professionals engaged in dairying had a significantly higher total income than those with their main occupation in dairying, cropping or working as farm labourers. Uneducated farmers obtained a significantly larger income through crops, whereas farmers with tertiary education obtained more income through off-farm work, This study suggests that more attention must be paid to the actual use of labour and the improvement of the dairy output/cost ratio.

• Journal of muscle and joint health
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• v.5 no.1
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• pp.72-82
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• 1998

The purpose of this study was to identify functional impairment and psychological status and to analyze their relationships in patients with chronic arthritis. The sample was consisted of 75 arthritic patients who visited H hospital and S welfare center. Functional impairment was measured by ADL, pain, and the number of painful joint. Psychological status was measured by depression, self-efficacy, and quality of life. Data was analyzed by frequency, mean ${\pm} SD$, Pearson's correlation coefficient, and Stepwise multiple regression. The results of this study were as follows : 1. In functional Impairment, ADL was below average which means somewhat difficult, pain was above average, and the number of painful joint was 9.20. 2. In psychological status, scores of quality of life was 97.89, depression was 41.28, self-efficacy was 895.35. 3. Pain was negatively correlated to self-efficacy, ADL and quality of life, and positively correlated to depression. 4. Self efficacy and depression explained 45% of the variance in quality of life. Therefore, it is suggested that nursing intervention improving psychological status would be useful for patients with chronic arthritis. Especially, it is very important to implement nursing intervention focused on increasing self-efficacy and decreasing depression.

• Asia-Pacific Journal of Business
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• v.11 no.4
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• pp.83-101
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• 2020

Purpose - The purpose of this study is to identify the factors which affect the performance of Chinese web drama. Design/methodology/approach - For empirical investigation, 163 web dramas which were listed in AiQiyi platform were used as the sample. It was hypothesized that number of explanatory variables drawn from previous research, including the power of producing company, and star power of actors and actresses, average length of an episode, genre of the drama, viewer ratings, existence of exclusive SNS account and the use of existing IP, would influence the performance of the drama measured by cumulative hit number. A hierarchical regression analysis is conducted to test hypotheses. Findings - Results show that star power of actors and actresses, average length of an episode, viewer ratings and the use of IP indeed affect the performance of Chinese web drama. Research implications or Originality - As the first empirical study of this kind, this study may help not only domestic but also global participants of fast growing Chinese web drama industry.