• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.19 no.6
• /
• pp.203-212
• /
• 2019

Along with the recent fourth industrial revolution, the world's manufacturing powerhouses are pushing for national strategies to revive the sluggish manufacturing industry. Moon Jae-in, the government is in accordance with the trend, called 'advancement of science and technology is leading the fourth round of the Industrial Revolution' strategy. Intelligent information technology such as IoT, Cloud, Big Data, Mobile, and AI, which are key technologies that lead the fourth industrial revolution, is promoting the emergence of new industries such as robots and 3D printing and the smarting of existing major manufacturing industries. Advances in technologies such as smart factories have enabled IoT-based sensing technology to measure various data that could not be collected before, and data generated by each process has also exploded. Thus, this paper uses data generators to generate virtual data that can occur in smart factories, and uses them to analyze the cause of the defect in real time and to predict the replacement cycle of the facility.

• Wind and Structures
• /
• v.19 no.2
• /
• pp.145-167
• /
• 2014

Wind-vehicle-bridge (WVB) interaction can be regarded as a coupled vibration system. Aerodynamic forces and moment on vehicles and bridge decks play an important role in the vibration analysis of the coupled WVB system. High-speed vehicle motion has certain effects on the aerodynamic characteristics of a vehicle-bridge system under crosswinds, but it is not taken into account in most previous studies. In this study, a new testing system with a moving vehicle model was developed to directly measure the aerodynamic forces and moment on the vehicle and bridge deck when the vehicle model moved on the bridge deck under crosswinds in a large wind tunnel. The testing system, with a total length of 18.0 m, consisted of three main parts: vehicle-bridge model system, motion system and signal measuring system. The wind speed, vehicle speed, test objects and relative position of the vehicle to the bridge deck could be easily altered for different test cases. The aerodynamic forces and moment on the moving vehicle and bridge deck were measured utilizing the new testing system. The effects of the vehicle speed, wind yaw angle, rail track position and vehicle type on the aerodynamic characteristics of the vehicle and bridge deck were investigated. In addition, a data processing method was proposed according to the characteristics of the dynamic testing signals to determine the variations of aerodynamic forces and moment on the moving vehicle and bridge deck. Three-car and single-car models were employed as the moving rail vehicle model and road vehicle model, respectively. The results indicate that the drag and lift coefficients of the vehicle tend to increase with the increase of the vehicle speed and the decrease of the resultant wind yaw angle and that the vehicle speed has more significant effect on the aerodynamic coefficients of the single-car model than on those of the three-car model. This study also reveals that the aerodynamic coefficients of the vehicle and bridge deck are strongly influenced by the rail track positions, while the aerodynamic coefficients of the bridge deck are insensitive to the vehicle speed or resultant wind yaw angle.

• Wind and Structures
• /
• v.27 no.1
• /
• pp.11-27
• /
• 2018

The straight-cone steel cooling tower is a novel type of structure, which has a distinct aerodynamic distribution on the internal surface of the tower cylinder compared with conventional hyperbolic concrete cooling towers. Especially in the extreme weather conditions of strong wind and heavy rain, heavy rain also has a direct impact on aerodynamic force on the internal surface and changes the turbulence effect of pulsating wind, but existing studies mainly focus on the impact effect brought by wind-driven rain to structure surface. In addition, for the indirect air cooled cooling tower, different additional ventilation rate of shutters produces a considerable interference to air movement inside the tower and also to the action mechanism of loads. To solve the problem, a straight-cone steel cooling towerstanding 189 m high and currently being constructed is taken as the research object in this study. The algorithm for two-way coupling between wind and rain is adopted. Simulation of wind field and raindrops is performed with continuous phase and discrete phase models, respectively, under the general principles of computational fluid dynamics (CFD). Firstly, the rule of influence of 9 combinations of wind sped and rainfall intensity on flow field mechanism, the volume of wind-driven rain, additional action force of raindrops and equivalent internal pressure coefficient of the tower cylinder is analyzed. On this basis, the internal pressures of the cooling tower under the most unfavorable working condition are compared between four ventilation rates of shutters (0%, 15%, 30% and 100%). The results show that the 3D effect of equivalent internal pressure coefficient is the most significant when considering two-way coupling between wind and rain. Additional load imposed by raindrops on the internal surface of the tower accounts for an extremely small proportion of total wind load, the maximum being only 0.245%. This occurs under the combination of 20 m/s wind velocity and 200 mm/h rainfall intensity. Ventilation rate of shutters not only changes the air movement inside the tower, but also affects the accumulated amount and distribution of raindrops on the internal surface.

• Asian Pacific Journal of Cancer Prevention
• /
• v.16 no.17
• /
• pp.7689-7694
• /
• 2015

Background: Bone tumors are neoplasias with a high overall mortality; one of the main factors that reduce survival is their high capacity to develop metastases. It has been reported that finding lung metastases at diagnosis of osteosarcoma (OS), chondrosarcoma (CS) and giant cell tumor of bone (GCTb) is quite common. In this study, we inquire the relationship of metastases caused by these tumors with different clinical and pathological aspects, in order to guide medical personnel in the diagnosis and opportune treatment of metastases or micro metastases. Materials and Methods: We collected data of 384 patients with clinical, radiological and histopathological diagnosis of OS, GCTb and CS that attended the National Rehabilitation Institute (INR) during 2006 to 2014. Chi-square and Fisher's exact tests were performed for data analysis. Results: In the three tumor types, the presence of metastases at diagnosis was variable (p=0.0001). Frequency of metastases was 36.7%, 31.7% and 13.2% for OS, CS and GCTb respectively. The average age had no significant difference (p>0.05) in relation to metastases, even so, patients with OS and GCTb and metastases, were older while patients with CS and metastases were younger, in comparison to patients without metastases. Males had a higher frequency of metastases (68.2%, p = 0.09) in contrast to CS and GCTb, in which the metastases was more frequent in women with 51.9% (p = 0.44) and 57.9% (p = 0.56) respectively. Broadly, metastasis was associated with primary tumors located in the femur (44.4%), followed by the tibia (15.6%); metastases was more frequent when primary tumor of GCTb and OS were in the same bones, but were located in the hip (26.3%) for CS. Conclusions: The frequency of metastases in OS, GCTb and CS is high in our population and is determined by different clinicopathological variables related to the kind of tumor. Further studies are needed in order to evaluate metastases subsequent to diagnosis and associations with survival and clinicopathological factors, as well as to determine the sensitivity and specificity of current methods of detection.

• Industry Promotion Research
• /
• v.2 no.1
• /
• pp.45-50
• /
• 2017

This study analyzed the effect of on - the - job training of workers in Chungnam western area on productivity improvement. A total of 76 questionnaires were analyzed for workers in the western part of Chungcheongnam-do that completed the training course of the Korea Polytechnic University Education and Labor Ministry. The results of this study are as follows: First, the higher the motivation to receive the on - the - job training for the improvement of the productivity, the higher the satisfaction of the training of the worker, but the effect on the job productivity was not significant. Second, the correlation between training experience and job productivity was not statistically significant. Third, as for the effect on the productivity improvement according to the rank, the temporary workers showed higher education satisfaction than the regular workers (agency), and the job productivity was higher than the manager (manager level). Results of ANOVA analysis showed that there was a significant effect on educational satisfaction and job satisfaction according to years of work, career, and rank. The purpose of this study is to analyze the effects of on - the - job training of workers in the western part of Chungnam, on the productivity improvement, The validity of the study is significant.

• Korean Journal of Child Education & Care
• /
• v.18 no.2
• /
• pp.167-181
• /
• 2018

Many factors that may affect teaching aptitude of pre-service early childhood teachers have been discovered. However, little is known about the relationship between self-esteem and teaching aptitude in them. This study aimed to investigated self-esteem in relation to teaching aptitude in pre-service early childhood teachers. Pre-service early childhood teachers' self-esteem scale and teaching aptitude scale assessed the self-esteem and teaching aptitude of 344 pre-service early childhood teachers in C-city in Gangwon-do and N-city in Kyunggi-do, Korea. Results showed that all four dimensions of the self-esteem were significantly related to teaching aptitude, indicating that pre-service early childhood teachers with higher self-esteem were likely to have greater teaching aptitude. Regression analysis indicated that self-esteem in the areas of leadership and popularity, self-assertiveness, and social-relations significantly predicted teaching aptitude of pre-service early childhood teachers.

• Journal of the Korean Magnetics Society
• /
• v.26 no.3
• /
• pp.99-104
• /
• 2016

For patients receiving chemotherapy and radiation therapy treatment progresses as vomiting, nausea, weight of the patient because of a loss of appetite it is reduced. The patient's weight and the distance from the skin and the treatment site is expected to be closer, thereby reducing the change in the skin because of this dose. This study tests using a loose see the difference between the volume change appears as the weight of the patient using the same phantom and the phantom body of the patient. To using the same as the position EBT film is attached to the skin of the treatment site and was adjusted to the thickness of the Bolus. And using a computerized treatment planning only tomotherapy equipment was passed under the conditions according to the thickness of the radiation dose. To baseline for accurate reproduction position using the MVCT was applied to treated with verification. By passing a total of three dose reduced the error, it was a measure of the film by using a dedicated scanner, EBT VIDAR scanner. Got an increase in the skin dose is displayed each time the thickness of the bolus reduced, in a bolus was completely removed with the highest value. If the changes appeared dose was greater weight loss patients to chemotherapy and therefore bolus thickness variation considering the weight loss of the patient when applying the tomotherapy of nasopharynx cancer was found that the increase in skin dose be increased. This large patient before treatment due to weight loss over the image verification is considered to be established should consider how to re-create your mask and treatment plan for fixing it.

• Asian-Australasian Journal of Animal Sciences
• /
• v.28 no.6
• /
• pp.763-770
• /
• 2015

Improved meat quality and greater muscle yield are highly sought after in high-quality chicken breeding programs. Past studies indicated that polymorphisms of the Perilipin gene (PLIN1) are highly associated with adiposity in mammals and are potential molecular markers for improving meat quality and carcass traits in chickens. In the present study, we screened single nucleotide polymorphisms (SNPs) in all exons of the PLIN1 gene with a direct sequencing method in six populations with different genetic backgrounds (total 240 individuals). We evaluated the association between the polymorphisms and carcass and meat quality traits. We identified three SNPs, located on the 5' flanking region and exon 1 of PLIN1 on chromosome 10 (rs315831750, rs313726543, and rs80724063, respectively). Eight main haplotypes were constructed based on these SNPs. We calculated the allelic and genotypic frequencies, and genetic diversity parameters of the three SNPs. The polymorphism information content (PIC) ranged from 0.2768 to 0.3750, which reflected an intermediate genetic diversity for all chickens. The CC, CT, and TT genotypes influenced the percentage of breast muscle (PBM), percentage of leg muscle (PLM) and percentage of abdominal fat at rs315831750 (p<0.05). Diplotypes (haplotype pairs) affected the percentage of eviscerated weight (PEW) and PBM (p<0.05). Compared with chickens carrying other diplotypes, H3H7 had the greatest PEW and H2H2 had the greatest PBM, and those with diplotype H7H7 had the smallest PEW and PBM. We conclude that PLIN1 gene polymorphisms may affect broiler carcass and breast muscle yields, and diplotypes H3H7 and H2H2 could be positive molecular markers to enhance PEW and PBM in chickens.

• Journal of Nutrition and Health
• /
• v.47 no.1
• /
• pp.23-32
• /
• 2014

Purpose: This study was conducted in order to investigate the effect of Sargassum confusum extracts on the reduction of body fat for eight weeks in overweight women ($BMI{\geq_-}23kg/m^2$). Methods: Subjects were classified by double-blind randomized trial as the control group (C group, n = 14) and the Sargassum confusum extract supplementation group (SC group, n = 16), which consumed 12 tablets per day. Questionnaires related to their health status were assessed twice (week 0 and week 8). Their dietary intake status was evaluated by 24-recall method and body compositions were measured using a bioelectrical impedance analyzer. In addition, we assessed the anti-obesity effect and the occurrence possibility of health risk factors during the supplementation periods by hematological and clinical analysis of blood. Results: Waist circumference and body fat (%) were significantly decreased in the SC group. Serum leptin level was also significantly decreased in the SC group. Defecation frequency was significantly increased in the SC group. The above results indicate that Sargassum confusum extract supplementation improves overweight on visceral fat and blood leptin level by increasing bowel movement. These results imply a decrease of health risk factors in overweight women. Seven subjects withdrew from the study due to adverse events; however, no differences regarding adverse events were observed between the control and treatment group. Conclusion: Therefore, Sargassum confusum extract is a plausible effective agent for body fat reduction in humans.

• Journal of the Korean Society of Food Science and Nutrition
• /
• v.41 no.3
• /
• pp.327-332
• /
• 2012

In other to promote the utilization of native Gwangyang Rubus coreanus Miq. as an antioxidant material in functional food, its general composition, free sugars, vitamin C, vitamin E, and anthocyanin content were examined. Free sugars were mainly $2.83{\pm}0.01%$ glucose and $3.49{\pm}0.17%$ fructose. Native Gwangyang Rubus coreanus Miq. included higher vitamin C (0.04 g/100 g) and E (0.04 g/100 g) contents than other Rubus coreanus Miq. Anthocyanin was detected to be 2.41 g/100 g. Two extracts from native Gwangyang Rubus coreanus Miq., hot water extract (RCW) and 80% ethanol extract (RCE), were prepared by reflux, filter, and freeze-dry. The phenolic compound levels of RCW and RCE were 5.99% and 6.20%, respectively. In DPPH- and ABTS-radical scavenging activities, and lipid peroxidation formation inhibitory activity, RCE exhibited relatively high activities when compared to RCW (89.29% vs. 65.04%, 47.65% vs. 30.22%, 23.27% vs. 3.6%, respectively). Based upon these results, it is suggested that RCE from native Gwangyang Rubus coreanus Miq. possesses the antioxidant potentials for radical scavenging and anti-lipid peroxidation activities.