• The Journal of Industrial Distribution & Business
• /
• v.9 no.10
• /
• pp.21-37
• /
• 2018

Purpose - This paper explores the contribution lean makes to service levels by addressing lean thinking application in logistics process improvement within a MNC soft drinks manufacturer situated in the United Arab Emirates, and identifies the most significant sources of wastes and their interdependence and highlights key attributes of successful lean implementation. Research design, data, and methodology - This case study examines key logistics employees' perceptions on lean methodology. Results - The results highlight the most significant types of wastes in logistical processes and illustrates ways to eliminate wastes and streamline process flow. The importance of the human role within lean methodology is also identified. Findings suggest that managers should follow both a micro and macro approach when implementing lean practices, as focusing on one waste often leads to ignoring the significance of other wastes. Conclusions - This study highlights the importance of implementing lean at both micro and macro levels and shows how staff involvement increases the efficacy of lean thinking. It offers guidance towards the efficiency of creating value stream mapping processes in situ, which considers different wastes and their interdependence. Managers with limited resources are encouraged to implement lean methodology taking cognizance of these factors.

• Journal of the Korean Ceramic Society
• /
• v.43 no.10 s.293
• /
• pp.607-612
• /
• 2006

In VARTM (Vacuum Assisted Resin Transfer Molding) process, the permeability generally controls the filling time of the resin and it also affects the void characteristics of the fiber composite. In this study, carbon and glass fiber inter-layered hybrid composites (carbon fiber centered stack) with an epoxy matrix were fabricated by VARTM process and evaluated the resin flow and macro void characteristics. The permeability of glass fiber was higher than that of carbon fiber used in this study. Using Darcy's equation, the permeability of hybrid composites could be predicted and experimentally confirmed. After curing, the macro void content of hybrid composites was investigated using image analyzer. The calculated filling time was well agreed with experimental result and the void content was significantly changed in hybrid composites.

• Korea journal of population studies
• /
• v.11 no.1
• /
• pp.97-116
• /
• 1988

This study examines the socioeconomic determinants of fertility behavior in Korea by developing a model which simultaneously takes into account both individual and community-level differences. It especially focuses on the micro-macro nexus of fertility behavior depending on social contexts. This study utilizes micro data obtained from the 1974 Korean National Fertility Survey(KNFS), and macro data obtained from Korean government statistics. The framework of the model is formalized as a set of structural equations modelling the fertility process. The model is formed on a cohort-specific processual basis and is restricted to five-year birth cohorts. Three cohorts of women are studied : those aged 30-34, 35-39, and 40-44. The model includes three fertility-process components : age at first birth, early fertility, and later fertility, which are defined by reference to the age of the mother. The results of this study indicate that socioeconomic development in Korea results in increased age at first birth and reduced numbers of children per couple. In addition to the developmental change, Korea's fertility decline is found to be facilitated by family planning programs. As expected, the effect of family planning on fertility is greater among better-educated women than among poorly educated women. The inconsistent but suggestive result, however, is that the effect of socioeconomic development on fertility is greater among less-privileged women than among more-previleged women.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.22 no.4
• /
• pp.1-8
• /
• 2022

This study examined the effect of Internet exposure on plastic consumption behaviors, and the mediating effect of social norms. The survey participants in this study were 220 college students. Collected data were analyzed by the SPSS 26.0 and PROCESS macro 4.1 (model 4). The results of this study showed that the relationship between Internet exposure and intention to plastic consumption was mediated by descriptive norms. These results suggest that Internet exposure and social norms are important factors that can promote or constrain plastic consumption behaviors. Based on these results, we presented the theoretical and practical implications of this study.

• Korean Journal of Childcare and Education
• /
• v.20 no.1
• /
• pp.1-19
• /
• 2024

Objective: The purpose of this study was to verify the mediating effect of reflective thinking in the relationship between early childhood teachers' play-based curriculum implementation competences and their digital competences. Methods: An online survey was conducted targeting 330 early childhood teachers. Descriptive statistical analysis, correlation analysis, and The Process macro model 4 were performed using SPSS 28.0 and The Process macro 4.1. Results: The main results of this study are outlined as follows: first, a significant positive correlation was observed between overall play-based curriculum implementation competences, reflective thinking, and digital competences, including each of their respective sub-factors. Second, the study revealed that reflective thinking played a partial mediating role in the relationship between early childhood teachers' play-based curriculum implementation competences and digital competences. Conclusion/Implications: Through this study, it was confirmed that when reflective thinking mediated play-based curriculum implementation competences, digital competences were further increased. The findings suggest that not only positive play-based curriculum implementation competences of teachers but also reflective thinking should be considered to enhance digital competences.

• The Journal of the Convergence on Culture Technology
• /
• v.10 no.1
• /
• pp.129-136
• /
• 2024

The research purpose was to examine the effects of mothers parenting efficacy on children's school adjustment in the first grade of elementary, using young children's external problem behaviors and school readiness as the mediating variables. KICCE panel data were analyzed utilizing SPSS and Process macro. As results, young children's externalized problem behaviors and school readiness were found to have partial mediating effects in the relationship between mothers' parenting efficacy and school adjustment. In addition, the complete double mediating effect by externalized problem behaviors and school readiness was proved.

• Geomechanics and Engineering
• /
• v.36 no.2
• /
• pp.121-130
• /
• 2024

Many foundation projects are built on red-bed soft rocks, and the damage evolution of this kind of rocks affects the safety of these projects. At present, there is insufficient research on the damage evolution of red-bed soft rocks, especially the progressive process from mesoscopic texture change to macroscopic elastoplastic deformation. Therefore, based on the dual-porosity characteristics of pores and fissures in soft rock, we adopted a cellular automata model to simulate the propagation of these voids in soft rocks under an external load. Further, we established a macro-mesoscopic damage model of red-bed soft rocks, and its reliability was verified by tests. The results indicate that the relationship between the number and voids size conformed to a quartic polynomial, whereas the relationship between the damage variable and damage porosity conformed to a logistic curve. The damage porosity was affected by dual-porosity parameters such as the fractal dimension of pores and fissures. We verified the reliability of the model by comparing the test results with an established damage model. Our research results described the progressive process from mesoscopic texture change to macroscopic elastoplastic deformation and provided a theoretical basis for the damage evolution of these rocks.

• Tunnel and Underground Space
• /
• v.14 no.4
• /
• pp.248-260
• /
• 2004

Damage in brittle rock due to stress increase starts from initiation of microcracks, and then results in failure by forming macro failure planes due to propagation and coalescence of these discrete cracks. Conventionally, continuum approaches using macro-failure criteria or a number of elasto-plastic models have been major solution to implement rock damage and failure. However, actual brittle failure processes can be better described in phenomenological approach if initiation and propagation of discrete fractures are explicitly considered. This study presents damage and failure process of rock using a boundary element code, FRACOD, which has been developed to model fracturing process of rocks. Through a series of numerical uniaxial compressive tests, the feasibility of the developed model was verified, and realistic rock failure process was reproduced considering scale effects in rocks. In addition, the fracturing process and the corresponding rock damage in the vicinity of deep shaft in rock mass were presented as an application of this approach. This approach will be expected to contribute to finding better engineering solutions for the analysis of stability problems in brittle rock masses.

• The Journal of the Korea Contents Association
• /
• v.22 no.8
• /
• pp.492-502
• /
• 2022

This study was to verify the mediated moderation effects of parental neglect on the process where school teacher violence affected depression and suicidal ideation of adolescents. Data of 6,291 middle and high school students from 'research on the actual state of human rights of Korean children and adolescents IV' conducted by National Youth Policy Institute were analyzed. The analyses were carried out with SPSS 18.0 and Process Macro 4.0 using descriptive statistics, t-test, one-way ANOVA, regression analysis, and bootstrapping. The results showed that 1. school teacher violence and depression significantly influenced suicidal ideation of adolescents, 2. depression showed mediating effects on the process where school teacher violence influenced suicidal ideation, 3. parental neglect showed mediated moderation effects on the process where school teacher violence influenced suicidal ideation through depression. The study also suggested the necessity to complement the education and counseling program and the relevant policy for parents and teachers who could affect suicidal ideation of adolescents.

• Journal of Korean Society for Quality Management
• /
• v.31 no.1
• /
• pp.123-131
• /
• 2003

This paper considers a six sigma project for reducing the defects rate of the welding process in manufacturing firms. The project follows a disciplined process of five macro phases. define, measure, analyze, improve and control(DMAIC). The need of customers is used to identify critical to quality(CTQ) of project. And a process map is used to identify process input factors of CTQ. Four key process input factors are selected by using an input factor evaluation of teams; an interval of welding, an abrasion, an electric current and a moving freely. DOE is utilized for finding the optimal process conditions of the three key process input factors. Another one key input factor improved to welding machine. The six sigma level of defects rate becomes a 2.01 from a 1.61 at the beginning of the project.