Bae J.,Kyungpook National University |
Lee S.,Kyungpook National University |
Kim B.C.,Kyungpook National University |
Cho H.H.,Hanyang University |
Chae D.W.,Seojeong College
Fibers and Polymers | Year: 2013
Polyester-based thermoplastic elastomer (Hytrel®) was melt-compounded with multi-walled nanotubes (MWNTs) using an internal mixer and the changes in the thermal, electrical and rheological properties were investigated using a range of nanotube contents (from 0.1 to 7 wt%). Even at nanotube concentrations as low as 0.1 wt%, the crystallization temperature was remarkably elevated by 15 °C and it increased further up to 22 °C with a 5 wt% loading. On the contrary, the melting temperature increased by 2 °C with 0.1 wt% MWNTs and it was slightly decreased by further additions of MWNTs. Electrical conductivity measured by the four probe method was detected from the 1 wt% MWNTs, indicative of electrical percolation. In addition, MWNTs starting from 4 wt% and above had no significant effect on the electrical conductivity, while it rapidly increased with nanotube contents below 4 wt%. Dynamic rheological properties were measured using a strain controlled rotational rheometer. The complex viscosity increased with MWNT contents giving an abrupt increase between 0.5 and 1 wt% loadings. In addition, the storage and loss modulus increased in a different manner depending on the range of the nanotube concentration. In the Cole-Cole plot, the slope of the nanocomposites decreased from 1.63 to 0.74 with increasing nanotube contents. In the Casson plot, the addition of MWNTs up to 0.5 wt% did not show any yield behavior giving an extremely low value for the yield stress, but further additions of nanotubes increased it notably. The presence of nanotubes in the elastomer increased the relaxation time with nanotube contents and their effect became weak as the frequency increased. © 2013 The Korean Fiber Society and Springer Science+Business Media Dordrecht.
Cho K.,Seojeong College |
Kim J.M.,Seoul National University |
Kim M.H.,Chungbuk National University |
Kang S.S.,Chonnam National University |
And 2 more authors.
European Surgical Research | Year: 2014
Differential diagnoses for canine bone disease are commonly based on radiography. However, scintigraphy is a nuclear scanning test to trace bone healing during stress fracture and osteomyelitis and thus can be used to probe the osseointegration process in vivo in the context of the dental implant. The purpose of this study was to explore the possibility of using noninvasive scintigraphy to probe the effect of platelet-rich plasma (PRP) to enhance osseointegration of the implant and to confirm the result with a parallel histological examination in adult beagle dogs. Two independent calcium phosphate-coated titanium screw implants 8 mm in length and 4 mm in diameter were inserted into each tibia in 4 dogs (4 implants/animal, total = 16). The PRP-treated group was deposited with 0.5 ml of PRP into the drill hole in the right tibia; the control group was instilled with 0.5 ml of saline into the drill hole in the left counterpart before titanium screw implantation. Radiography of the implanted tibias showed complete osseointegration but no osteomyelitis. No difference in the ossification of the peri-implant bone on the radiographs was observed between the two groups during the experimental period. However, the scintigraphic findings revealed obvious differences in bone uptake between the two groups. The higher bone uptake in the PRP-treated group significantly increased bone activity and faster bone regeneration compared to the control group (p < 0.05) at 4 weeks after implantation. The percentage of the bone-to-implant contact on histological examination in the PRP-treated group showed dense cortical bone formation in close contact with the metallic surface of the titanium implant (p < 0.05). Quantitative histological analysis correlated well with that of the scintigraphic evaluation as revealed by Pearson correlation analysis (r = 0.72, p < 0.05). Thus, scintigraphy is a sensitive and noninvasive method suitable for osseointegration of the implant in vivo. © 2013 S. Karger AG, Basel.
PubMed | Seojeong College, University of Ulsan, Kyung Hee University, University of California at San Francisco and 3 more.
Type: Journal Article | Journal: Basic & clinical pharmacology & toxicology | Year: 2016
Memantine is a non-competitive N-methyl-D-aspartate (NMDA) receptor antagonist used to treat Alzheimers disease. We investigated memantine pharmacokinetics after oral, IV and patch administration in rats, and compared memantine pharmacokinetics after multiple- or single-dose oral and transdermal administration. Venous blood was collected at preset intervals in single- and multiple-dose studies. Non-compartmental pharmacokinetics was analysed for all formulations. The oral, IV and patch memantine doses were 10mg/kg, 2mg/kg and 8.210.89mg/kg, respectively. The maximum plasma concentration was lower and the half-life longer after patch administration than oral and IV administration. Memantine bioavailability was 41 and 63% for oral and patch administration, respectively. Steady state was achieved around 24hr for oral and patch administration. The mean AUC increased after oral or patch administration from single to multiple dose. The memantine patch formulation displayed a longer duration of action and lower peak plasma concentration. However, drug exposure was similar to the oral formulation at each dose. Additionally, the memantine patch formulation displayed a smaller interindividual variability and lower accumulation than the oral formulation.
Kim J.,Seojeong College |
Kwon J.,Hanyang University |
Noh G.,Chungnam National University |
Lee S.S.,Hanyang University
Nutrition Research and Practice | Year: 2013
A food allergy is an adverse health effect arising from a specific immune response that occurs reproducibly upon exposure to a given food. In those with food allergies that are thought to cause aggravation of eczema, food avoidance is important. The objective of this study was to research the nutritional status of patients with food allergies. A total of 225 subjects diagnosed with atopic dermatitis underwent a skin prick test as well as measurement of serum immunoglobulin E. Food challenge tests were conducted using seven food items: milk, eggs, wheat, soybeans, beef, pork, and chicken. At post-food challenge visits to the test clinic, participants completed a three-day dietary record, which included two week days and one weekend day, in order to evaluate energy intake and diet quality during the challenge. We analyzed nutrient intake based on differential food allergens. Subjects with a food allergy to milk showed lower intake of Ca, Zn, and vitamin B2, and subjects with a food allergy to egg showed lower intake of vitamin A, B1, B2, niacin, and cholesterol. Subjects with a food allergy to wheat and soybean showed lower intake of Ca, P, Fe, K, Zn, vitamin B2, vitamin B6, and niacin; and subjects with a food allergy to beef, pork, and chicken showed lower intake of Fe and higher intake of K, vitamin A, B2. Subjects with atopic dermatitis were lacking in several nutrients, including vitamin A and vitamin C. A greater number of food allergies showed an association with a greater number of nutrient intake deficiencies. Allergen avoidance is the basic treatment for atopic dermatitis. However, when the allergen is food, excessive restriction can lead to nutrition deficiency. Findings of this study suggest the necessity for enhanced nutritional education in order to provide substitute foods for patients with food allergies who practice food restriction. © 2013 The Korean Nutrition Society and the Korean Society of Community Nutrition.
Kang Y.-S.,Chungnam National University |
Lee K.-C.,SeoJeong College |
Park J.-H.,Jeju National University
International Journal of Applied Engineering Research | Year: 2015
This study aims at investigating effects of art activities using natural objects in the forest on children’s emotional intelligence. To accomplish this aim, this study selected as the experimental group 20 children from a class of the 5-year-olds in B Daycare Center located in South Chungcheong Province, Korea. And it selected as the comparative group 20 children from a class of the 5-year-olds and as the non-experimental group 20 children from a class of the 5-year-olds, 40 altogether, in J Daycare Center, near B Daycare Center. The result was found that children’s art activities using natural objects in the forest generally had a positive influence on their emotional intelligence, which proves usefulness of the art activities based on the forest experience. This means that art activities using natural objects effect a change in the emotional intelligence by exploring colors, lines, forms and textures of the art materials including natural objects and by making shapes and forms of sculptures by visually expressing their thoughts, feelings and experiences, using as the main material the natural objects(stones, leaves, boughs, petals, grasses, cosmos and fallen leaves)collected from nature and usable for the art activity. © 2015, Research India Publications, All rights Reserved.
Kim K.J.,Seojeong College |
Lee Y.-C.,Korea Institute of Industrial Technology |
Park J.-H.,Korea University
Materialwissenschaft und Werkstofftechnik | Year: 2015
The case of an electric vehicle, where a motor and a battery system can be substituted for an engine and a transmission system, comprises a very fascinating power source. However, due to the low power performance of the motor system, the weight reduction of the electric vehicle for the increase of the efficiency is necessary. For the research of the new vehicle, the benchmarking of developments leading companies about the electric vehicle was considerably surveyed first. Then the CAE (computer aided engineering) simulation of the full vehicle (Metro by Geo Co.) model was performed. Among these systems, as the weight of the batteries are comparably high (200 ∼ 300 kg or over), the problem of the safety performance can occur where the motor and the battery are situated in the vehicle location (in the front engine room, center floor or rear trunk position). In addition, the reinforcement degree can differ following as the motor and the battery position in the vehicle in order to satisfy the vehicle safety and it can induce the weight variation of the vehicle. Therefore, the effect of strength performance on the layout of the power train system (mainly battery) was clarified by using CAE (computer aided engineering) and the optimized position of the power train system considering weight balancing of the electric vehicle was suggested in the present study. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Park J.-H.,Korea University |
Kim K.J.,Seojeong College
International Journal of Precision Engineering and Manufacturing | Year: 2013
Increasing the fuel economy has been an inevitable issue for the development of new cars, and one of the important measures to improve the fuel economy is to decrease the vehicle weight. In this study, savings in weight using lightweight materials such as aluminum alloy can lead to increase fuel economy and reduction in air pollution. In order to obtain this goal, the researches about lighter and stronger link components have been studied without sacrificing safety. Aluminum alloy material has a weak point compared to the steel material in strength for life cycle. In this study, in order to design a lighter and more reliable chassis component using aluminum material as compared with existing steel chassis components, a new camber link shape was suggested by adding vertical ribs to an existing I-beam type link and to investigate how each design parameter makes an effect on the reliability and component weight. The computer aided engineering (CAE) was performed with 9 design parameters and 2 levels. Through the analysis of variance, 3 parameters which were the most influential one on weight were selected. Through these results, the weight of the aluminum camber link was 59% that of the steel link. The stiffness of the optimized aluminum camber link under all loads was more than 100% that of the steel link. © 2013 Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg.
PubMed | National Health Research Institute, Seojeong College and Korea University
Type: Journal Article | Journal: Asian nursing research | Year: 2014
This study aimed to develop a job description for healthcare managers of metabolic syndrome management programs using task analysis.Exploratory research was performed by using the Developing a Curriculum method, the Intervention Wheel model, and focus group discussions. Subsequently, we conducted a survey of 215 healthcare workers from 25 community health centers to verify that the job description we created was accurate.We defined the role of healthcare managers. Next, we elucidated the tasks of healthcare managers and performed needs analysis to examine the frequency, importance, and difficulty of each of their duties. Finally, we verified that our job description was accurate. Based on the 8 duties, 30 tasks, and 44 task elements assigned to healthcare managers, we found that the healthcare managers functioned both as team coordinators responsible for providing multidisciplinary health services and nurse specialists providing health promotion services. In terms of importance and difficulty of tasks performed by the healthcare managers, which were measured using a determinant coefficient, the highest-ranked task was planning social marketing (15.4), while the lowest-ranked task was managing human resources (9.9).A job description for healthcare managers may provide basic data essential for the development of a job training program for healthcare managers working in community health promotion programs.
Hong M.-S.,Jeju National University |
Lee K.-C.,SeoJeong College |
Park J.-H.,Jeju National University
International Journal of Applied Engineering Research | Year: 2015
Expansions and changes of the digital environment have evolved humankind, and they have also remodeled lifestyles of individuals. With such a fast growth, various kinds of different cultures and information are shared, drawing people’s attention naturally to hybrid phenomena. Hybrid refers to a heteromorphy created between two different races, varieties, characteristics, etc. and to be a process of creating something different by discovering a value through the logic of new combination and mixing it with existing things to generate energy for change. So the term hybrid has expanded to cover not only social and cultural events but also humanities and philosophical background and even the art and education areas. This study seeks to adopt a self-directed problem-solving-supportive interaction training method in the hybrid environment in order to develop H (Hybrid)–GROW model capable of providing coaching anytime anywhere. As the coaching environment (face-to-face coaching, B-coaching, hybrid coaching) has been insufficiently researched in extant study, it was not easy to present and realize an alternative to build an appropriate environment for effective coaching. Also, with the dawn of so-called smart era, people came to seek freer movement regardless of time and space. Coaches have been cultivated in various areas and the number of learners’ applications has also grown. In this situation, the face-to-face coaching has reached its limitations. To address this problem, this present study aims at presenting a hybrid coaching environment and developing H-GROW model based on GROW coaching model. © Research India Publications.
PubMed | Seojeong College
Type: Journal Article | Journal: European surgical research. Europaische chirurgische Forschung. Recherches chirurgicales europeennes | Year: 2014
Differential diagnoses for canine bone disease are commonly based on radiography. However, scintigraphy is a nuclear scanning test to trace bone healing during stress fracture and osteomyelitis and thus can be used to probe the osseointegration process in vivo in the context of the dental implant. The purpose of this study was to explore the possibility of using noninvasive scintigraphy to probe the effect of platelet-rich plasma (PRP) to enhance osseointegration of the implant and to confirm the result with a parallel histological examination in adult beagle dogs. Two independent calcium phosphate-coated titanium screw implants 8 mm in length and 4 mm in diameter were inserted into each tibia in 4 dogs (4 implants/animal, total = 16). The PRP-treated group was deposited with 0.5 ml of PRP into the drill hole in the right tibia; the control group was instilled with 0.5 ml of saline into the drill hole in the left counterpart before titanium screw implantation. Radiography of the implanted tibias showed complete osseointegration but no osteomyelitis. No difference in the ossification of the peri-implant bone on the radiographs was observed between the two groups during the experimental period. However, the scintigraphic findings revealed obvious differences in bone uptake between the two groups. The higher bone uptake in the PRP-treated group significantly increased bone activity and faster bone regeneration compared to the control group (p < 0.05) at 4 weeks after implantation. The percentage of the bone-to-implant contact on histological examination in the PRP-treated group showed dense cortical bone formation in close contact with the metallic surface of the titanium implant (p < 0.05). Quantitative histological analysis correlated well with that of the scintigraphic evaluation as revealed by Pearson correlation analysis (r = 0.72, p < 0.05). Thus, scintigraphy is a sensitive and noninvasive method suitable for osseointegration of the implant in vivo.