• Journal of Korean Society of Industrial and Systems Engineering
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• v.28 no.3
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• pp.149-155
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• 2005

In this paper, we optimize simulation model of a manufacturing system using the real-coded genetic algorithm. Because the manufacturing system expressed by simulation model has stochastic process, the objective functions such as the throughput of a manufacturing system or the resource utilization are not optimized by simulation itself. So, in order to solve it, we apply optimization methods such as a genetic algorithm to simulation method. Especially, the genetic algorithm is known to more effective method than other methods to find global optimum, because the genetic algorithm uses entity pools to find the optimum. In this study, therefore, we apply the real-coded genetic algorithm to simulation optimization of a manufacturing system, which is known to more effective method than the binary-coded genetic algorithm when we optimize the constraint problems. We use the reproduction operator of the applied real-coded genetic algorithm as technique of the remainder stochastic sample with replacement and the crossover operator as the technique of simple crossover. Also, we use the mutation operator as the technique of the dynamic mutation that configures the searching area with generations.

• The Journal of Korean Obstetrics and Gynecology
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• v.27 no.4
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• pp.25-42
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• 2014

Objectives: To observe the effects of Herb medication on Polycystic Ovary (PCO) in rats. Methods: Riss (Research Information Sharing Service) was searched for Oriental medicine about PCO on 2000~2014. So, Experimental studies using PCO model induced by Estradiol Valerate (EV) was selected to analyze how effects they were. Consequently, 10 studies published on 2000~2014 were selected to analyze about weight of model and both ovaries, the number aries, the number of follicle and corpus of follicle and corpus luteum, the level of serum Androstenedione (ADD) and total estrogen, the level of Nerve Growth Factor (NGF) and Corticotropin Releasing Factor (CRF), the crossover rate and the number of implantation. Results: Among them, there was significantly difference between treatment group and control group in weight of both ovaries, the number of follicle and corpora lutea, the crossover rate and the number of implantation. Conclusions: The effects of Herb medication was observed on making weight of ovaries with PCO to promote. The study about effect of Herb medication on NGF and CRF with PCOS had to be conducted. The further research have to focus on treatment of subfertility and infertility, that is field showing the advantage of Oriental medicine.

• International Journal of Computer Science & Network Security
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• v.24 no.3
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• pp.12-22
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• 2024

The travelling salesman problem is very famous and very difficult combinatorial optimization problem that has several applications in operations research, computer science and industrial engineering. As the problem is difficult, finding its optimal solution is computationally very difficult. Thus, several researchers have developed heuristic/metaheuristic algorithms for finding heuristic solutions to the problem instances. In this present study, a new hybrid genetic algorithm (HGA) is suggested to find heuristic solution to the problem. In our HGA we used comprehensive sequential constructive crossover, adaptive mutation, 2-opt search and a new local search algorithm along with a replacement method, then executed our HGA on some standard TSPLIB problem instances, and finally, we compared our HGA with simple genetic algorithm and an existing state-of-the-art method. The experimental studies show the effectiveness of our proposed HGA for the problem.

• Journal of Distribution Science
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• v.16 no.1
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• pp.59-71
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• 2018

Purpose - Recognizing the importance of small and medium enterprises and venture enterprises for the domestic economy, the purpose of the present study is to select factor termed export modes from among various export success strategies and factors that can help those enterprises secure export competitiveness in the world market to analyze the effects of export modes on the amounts of exports and periods until export after the foundation of those enterprises. Research design, data, and methodology - A structured questionnaire was used as a tool to derive the purpose of the study, and a questionnaire survey was conducted using a mobile survey technique that facilitated the distribution of questionnaire sheets and the collection of results. The main methodology used is crossover analysis, and the regression analysis technique was applied to verify the study results derived, thereby securing the reliability and validity of the final results derived. Results - Small and medium venture enterprises with shorter periods of time until the first export success after establishment adopted direct export modes more frequently, and those enterprises with larger amounts of the first export after establishment adopted direct export modes more frequently. The results of quantitative analysis, indicating that 66.1% of those enterprises with an export amount exceeding one billion won adopted direct export modes, can be said to support the foregoing. The crossover analysis results derived as such were reanalyzed using the PPML regression analysis technique to quantitatively identify that the amounts of the first export of enterprises that adopted direct export modes were larger than those of enterprises that adopted indirect export modes by 120%. Conclusions - The present study implies differentiated values in three aspects. First, the present study investigated and presented the export success factors and strategies of small and medium venture enterprises in a total of 14 countries in the Asian region, European region, North American region, African region, and South American region. Second, it intensively investigated five export modes to identify and verify that they were affecting the export success of small and medium venture enterprises. Third, based on the results of the investigation, the present study presented two marketing implications in the pragmatic aspect.

• Journal of the Korean Society of Costume
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• v.50 no.6
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• pp.163-175
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• 2000

This study focuses on the Zen style in contemporary fashion which presents itself as one of the dominant cultural phenomena these days. After investigating the basic concepts and features of the Zen style and examining its birth and development, this study moves on to the ways in which it is characteristically applied for the world of fashion. This study is also performed both by the theoretical research on related books and papers for the explication of main concepts and by the practical research on fashion magazines and works of famous fashion designers for the presentation of more detailed illustration. When we are talking about postmodernism, which is a reaction against or a continuation of modernism, as a cultural dominant shown up in the late twentieth century, the Zen style itself can be regarded as a typical representation of postmodernism in fashion. Although the Zen style can be viewed as sharing the basic principles with minimalism which is a main branch of modernism, it is strongly in line with postmodernism (which is human-centered) in that its fundamental idea is based on emotions and feelings of human beings and the purity of natural world. As above, ZEN is a crossover phenomenon between postmodernism and modernism. In this sense, it is said that within the name of postmodernism the Zen style has satisfied our desire to present our inner world of mind with the help of regional philosophy (in this case Oriental one). The four main aspects of the Zen style in fashion are following : simplicity connected with the Oriental moderation, the use of the Oriental silhouette and detail, the destruction of form, and the nature-friendly attitude. These will be under close examination in this study.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.10a
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• pp.306-308
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• 2022

The purpose of this study is to compare and analyze the sniffing position and the modified ramped position, which was created by using a specially designed instrument, to improve the performance of advanced airway management during endotracheal intubation. The study included 30 students from the Department of Emergency technology, N University, who had completed advanced cardiac life support and advanced airway management. The randomized crossover study was conducted with the students who were randomly assigned into two groups; Sniffing position and Modified ramped position. As a result of the study, the modified ramped position showed better glottal vision than the sniffing posture, and there was a significant difference in speed time. In the subject's subjective ease, confidence, and preference, the modified ramped position showed better results than the sniffing posture. Therefore, it is considered that modified ramped position during endotracheal intubation will help improve the performance of advanced airway management.

• The Journal of Internal Korean Medicine
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• v.33 no.4
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• pp.511-519
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• 2012

Objectives : This study investigated the effect of Sinseonbulchuidan (SBD-1) on hangover syndrome. We undertook this study to test whether SBD-1 is effective in preventing the signs and symptoms of alcohol-induced hangover. Methods : Fifteen healthy volunteers participated in this double-blind randomized crossover study. All participants received either SBD-1 or indistinguishable placebo capsules before alcohol consumption. The primary outcome measure was the difference in hangover severity scores between SBD-1 and placebo intervention. Secondary outcome measure was the difference in profile of mood states (POMS) between SBD-1 and placebo intervention. Results : After alcohol exposure, the overall symptom scores were significantly decreased in the SBD-1 group compared with those given a placebo. The mean scores for the hangover symptoms were high in the placebo group, and statistical significance was observed in 4 symptom scores (loss of appetite, stomachache, nausea, and total score). There were no differences in the POMS and cognitive performance test results between SBD-1 and placebo intervention. Conclusions : We conclude that the SBD-1 is effective in preventing the signs and symptoms of alcohol-induced hangover. Larger studies are required to confirm these findings.

• Journal of Nutrition and Health
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• v.30 no.4
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• pp.406-414
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• 1997

It has been known that dietary phytate decreases the absorption of body zinc pool which is composed of the dietary and endogenous zinc in the body. The purpose of this study was to examine the effect of phytate on the absorption of total bodyzinc in Zn-depleted rats. Rats were Zn-depleted with either low(0.8%) or high(1.6%) Ca diet containing sodium phytate for 4 weeks. After zinc depletion, rats were assigned into phytate or non-phytate dietary groups within each low-or high-Ca dietary group. ant feces were collected for 2 weeks of the initial collection and 1 week after dietary crossover, during which the phytate and the non-phytate diet was switched over within the same Ca group. The content of Zn and Ca measured by atomic absorption spectrophotometer and phytate content was analyzed. food intake was higher in the high Ca group than in the low Ca group(p <0.0001), and was also higher in the non-phytate group than in the phytate group(p <0.0001). Food intake and phytate level affected body weight gain in rats(p <0.0001). Zinc excretion in the total feces was higher in the phytate group than in the non-phytate group at both low and high Ca level(p <0.0001), except during the crossover collection period in high Ca group. Calcium, however, didn't show any synergistic effect on phytate effect(p <0.05). This study showed that phytate decreased the absorption of total body zinc at both low and high Ca levels in Zn-depleted rats. A large portion of total body zinc originated from the endogenous zinc pool in these rats. The results of the present study showed the same effect of phytate on the endogenous zinc in Zn-depleted rats as in a previous study, confirming that phytate adversely affects zinc bioavailability, especially under marginal and poor zinc nutrition.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.10a
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• pp.300-302
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• 2022

The purpose of this study is to compare the speed, confidence, and ease of endotracheal intubation in a transfer posture by using the SALT(Supraglottic Airway Laryngopharyngeal Tube), and a direct laryngoscope to improve the ability to implement professional airway management. The subject of the study was an experimental study by a randomized crossover design, targeting 28 first-class emergency medical technicians working in J-do fire station, and the SPSS 20.0 version was used for data analysis. The endotracheal intubation by using SALT showed a significant difference in speed compared to endotracheal intubation by using a direct laryngoscope(p<.001), and also showed a significant difference in confidence and ease(p<.001). If it is transfer to endotracheal intubation by direct laryngoscope, or in the case of transfer patients, if SALT is used, safe and rapid intubation will be possible.

• Information Systems Review
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• v.19 no.3
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• pp.179-199
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• 2017

As users' cross-over shopping behaviors become more popular, many studies have attempted to describe a theoretical mechanism in multichannel environments. Apart from explaining a simplified multichannel user behavior, relevant researchers must deeply understand the mechanism of users' cross-over shopping behavior, which cannot be discovered by employing either existing theories or traditional research methods. Thus, this study explores why, how, and when users conduct cross-over shopping behaviors in multichannel environments by employing a grounded theory approach. In this study, we have interviewed 25 participants who have prior experiences in cross-over shopping. By analyzing the interview manuscripts using the grounded theory approach, we have extracted 118 codes in the coding steps and ultimately presented 28 categories by incorporating similar concepts from those codes. In this qualitative grounded theory study, we have discussed why, how, and when users do cross-over shopping behavior based on our selected codes and categories as well as by listening to the stories of our interviewees. By grounding our proposed framework, which can capture both dynamic information search and purchasing behavior, this study provides an alternative research approach to explain user behavior, thereby bolstering our current understanding of the cross-over shopping behavior of users in multichannel environments.