• Journal of Families and Better Life
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• v.28 no.2
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• pp.17-26
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• 2010

This study aimed to explore psychological separation from parents, family adaptability, and child's adjustment to college, in order to assess general standards and sex difference. It also investigated explaining variables on children's adjustment to college. The study subjects were 243 college students(male students; 123, female students; 120).The data collected from questionnaire were analyzed by descriptive statistics, t test, Pearson's correlation and hierarchical multiple regression. The main results were as follows: Firstly, psychological separation from parents of college students were lower than those of average score. But family adaptability and adjustment to college of students were higher than those of average score. Secondly, psychological separation from parents was negatively correlated to adjustment to college, but family adaptability was positively correlated to adjustment to college. Finally, variables that explain child's adjustment to college was cohavitation with parents and family adaptability. In addition to these variables, psychological separation from parents was a major factor for female students.

• Korean Chemical Engineering Research
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• v.60 no.1
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• pp.51-61
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• 2022

Gas separation via hollow fibre membrane modules (HFMM) is deemed to be a promising technology for natural gas sweetening, particularly for lowering the level of carbon dioxide (CO₂) in natural gas, which can cause various problems during transportation and process operation. Separation performance via HFMM is affected by membrane properties, module specifications and operating conditions. In this study, a mathematical model for HFMM is developed, which can be used to assess the effects of the aforementioned variables on separation performance. Appropriate boundary conditions are imposed to resolve steady-state values of permeate variables and incorporated in the model equations via an iterative numerical procedure. The developed model is proven to be reliable via model validation against experimental data in the literature. Also, the model is capable of capturing axial variations of process variables as well as predicting key performance indicators. It can be extended to simulate a large-scale plant and identify an optimal process design and operating conditions for improved separation efficiency and reduced cost.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.24 no.4
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• pp.407-413
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• 2015

Research for renewable energy is being performed since it has the merits of little pollution of the environment and sustainable energy resources. Microalgae is attractive as a renewable energy resource. Biomass of the microalgae can be produced by mass culturing, and bulk harvest technology of is needed to produce biomass continuously. Recently, ultrasonic waves were used to harvest the cultivated microalgae continuously. In this study, the separation process using ultrasonic waves was performed to effectively harvest the microalgae. An ultrasonic wave separation resonator was designed and manufactured based on the acoustic field analysis. Separation experiments using design of experiment were carried out, and the influence of experimental variables from the ultrasonic wave separation process was investigated. Mixing conditions of variables were estimated to obtain high separation efficiency and a large microalgae harvest. Experimental results for suitable mixing conditions were compared with simulation results calculated from the state equation.

• Journal of Biosystems Engineering
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• v.28 no.1
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• pp.19-26
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• 2003

An oscillating digger mechanism was designed, constructed. and tested. The mechanism is consisted of a six-bar linkage, one four-bar linkage was fer the digger blade and the other one fur variable soil-crop separation. Experimental variables were amplitude(3, 6, 9 mm). frequency(11.2, 14.9. 17.0 Hz), and forward speed of tractor(0.91, 1.13, 1.56 km/h). Each combination of these variables was replicated three times to measure the draft and torque for power requirement evaluation. and the broken-up soil height on the soil separation sieve mechanism. Four parameters λ(the ratio of vibration speed to forward velocity), p(the ratio of vibration acceleration to forward velocity), K(the ratio of vibration acceleration to gravitational acceleration), and T(the product of λ and K) were induced from three experimental variables: amplitude, frequency, and tractor speed. And the power requirement and soil separation ability were analyzed by regression. Though λ and K were known to be the representative parameters. T was the most moderate one to explain draft. torque. and soil separation in this study. It was estimated that the T equal to or greater than 2.4 was the minimum recommended value. Figure 18 would be useful fir the selection of amplitude. frequency, or operating tractor speed once any two variables are known.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2003.09b
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• pp.80-83
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• 2003

In this note, a separation principle of the Takagi-Sugeno (T-S) fuzzy-model-based controller/observer is investigated. The separation principle of T-S fuzzy-model-based controller/observer sharing the premise parts in the fuzzy rule with directly measurable premise variables is well established. In that case, the fact that the augmented observer-based control system has the eigenvalues of the sub-closed-loop control system by the state-feedback controller and the sub-closed-loop observer error system is used to prove the separation principle. This paper studies the separation principle of T-S fuzzy-model-based controller/observer in which the premise variables cannot be directly measurable.

• Transactions of the Korean hydrogen and new energy society
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• v.27 no.2
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• pp.211-219
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• 2016

To develop an ash separator for the solid fuel chemical looping combustion system, effects of operating variables such as solid injection nozzle velocity, diameter of solid injection nozzle, gap between solid injection line and vent line, vent line inside diameter, and solid intake height on solid separation rate and solid separation efficiency were measured and discussed using heavy and coarse particle and light and fine particles mixture as bed material in an acrylic fluidized bed apparatus. The solid separation rate increased as the solid injection nozzle velocity and the diameter of solid injection nozzle increased. However, the solid separation rate decreased as the gap between solid injection line and vent line, the vent line inside diameter, and the solid intake height increased. The solid separation efficiency was in inverse proportion to the solid separation rate. In this study, we could get high solid separation rate up to 2.39 kg/hr with 91.6% of solid separation efficiency.

• KSBB Journal
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• v.4 no.3
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• pp.281-287
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• 1989

The experimental study reported herein was to investigate to separation characteristics of a tangential flow membrane in a continuous recycle situation. Physical and dynamic analyses are performed on the membrane system in order to relate relevant variables to the capacity of separation. The results of separation process may be summarized by a proposed equation:Sh=A(Re.Sc.dh/L)1/3. It was shown also by the analyses that effective separation of sugar and cell was attainable by means of tangential membranes, thereby enhancing ethanol productivity in fermentation with continuous cell and substrate recycle.

• Journal of the Korean Home Economics Association
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• v.36 no.8
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• pp.13-20
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• 1998

The purpose of this study was to examine the relations of matemal parenting behaviors, child's stranger anxiety, and separation anxiety to matemal separation anxiety. A total of 288 middle class mothers having children aged from 36- to 59-month- olds answered to a questionnaire based on Maternal Separation Anxiety Scale (Hock, 1989). They also answered the questions about maternal parenting behaviors, child's stranger anxiety, and separation anxiety. The main results were as follows : 1. There were no significant differences in maternal separation anxiety as a function of demographic variables. 2. Maternal parenting behaviors such as physical contact and discipline involvement were significantly related to maternal separation anxiety. And child's stranger anxiety and separation anxiety were also significantly related to matemal separation anxiety. 3. Maternal separation anxiety was accounted for 15% of the variance by maternal physical contact, discipline involvement, and chlid's stranger anxiety and separation anxiety.

• Korean Journal of Child Studies
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• v.27 no.2
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• pp.101-126
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• 2006

In this comparison of the relative effects of children's separation from their parents, socio-emotional adjustment was assessed by emotional and behavioral problems and emotional intelligence. Subjects were 502 elementary school children separated from their parents(162 in Yanbian and 340 in Korea) and their caregivers. Data analysis was by frequency, t-test, and multiple regression controlled by gender and grade in school. Caregivers living with children and their parenting efficacy were significant variables for the development of socio-emotional adjustment in Korean-Chinese children in Yanbian, but reasons for parent-child separation, caregivers' psychological and behavioral characteristics, and SES were significant variables for children in Korea. Implications are that regional differences should be considered in understanding and supporting the development of children's socio-emotional adjustment.

• Journal of the Korean Home Economics Association
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• v.48 no.4
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• pp.13-24
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• 2010

The aims of this study were to investigate relation the effects of parent-children relationship on marriage attitude among unmarried persons and to utilize the findings as source material in assessing changes to marriage and family value. In total 654 unmarried persons above the age of 20 in this study. A survey format was used to asked questions, and collected data were subjected to descriptive and comparative analysis using the SPSS(Version 15.0) program. The results were as follows. Among socioeconomic variables, religion was significantly relate to marriage attitude(p < .001). Parent-child relationship and psychological separation was significantly related to marriage value(p < .05). Specifically, high psychological separation from mother, and relationship with father was related to more positive marriage attitudes. Finally, effective socioeconomic variables in marriage attitude were religion, job, psychological separation from mother and father.