• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.12
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• pp.106-111
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• 2017

In this study, the stiffness of an LMU (Leg Mating Unit), which is a device required for installing the top side part of an offshore structure, was examined through structural analysis. This unit is mounted on the supporting point of the structure and is used to absorb the shock at installation. It is a cylindrical structure with an empty center. To support the vertical load, elastomeric bearings (EBs) and iron plates are laminated in layers. The stiffness of the EBs is basically influenced by the size of the bearings, but it varies with the number of laminated sheets inside the same sized structure. The relationship between the stiffener and the compressive stiffness is investigated, and its design is suggested. The stiffness of the EBs is analyzed by calculating the reaction force, while controlling the displacement. First, the relationship between the size of the reinforcing plate and the compressive stiffness is considered. Next, the relationship between the number of stacked reinforcing plates and the compression stiffness is considered. Different loads are required for each installed point. The goal is to design the compression stiffness in such a way that the same deformation occurs at each point in the analysis. In this study, ANSYS is used to perform the FE analysis.

• The Journal of Churna Manual Medicine for Spine and Nerves
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• v.11 no.1
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• pp.11-23
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• 2016

Objectives : The purpose of this study was to investigate the characteristics and visiting patterns of traffic accident outpatients Methods : In this study, we reviewed the medical charts of 2,048 traffic accident patients who visited Jaseng Hospital of Korean Medicine from January 1st, 2012 to December 31st, 2012. Results : In the distribution of gender and of age patients, the male percentage was 52.3% and the majority of patients were in their thirties(47.2%). In the distribution of the patient's initial visit, most patients visited our clinic from Monday to Wednesday. By monthly distribution, the more patients visited the clinic at the latter half of the year. In the duration of treatment, 1,389 patients(67.8%) finished treatment within four weeks. The most frequently cited sites of pain were neck(82.0%), followed closely by low back(74.0%). In the access route, 746 patients(36.4%) visited our traffic accident clinic as a first choice for primary treatment. We referred patients for radiologic examination in 159 patients(7.9%), of which the exams were mainly lumbar spine MRIs(3.6%) and cervical spine MRIs(2.8%). The most frequent diagnosis were herniated nucleus pulposus. Conclusions : This study shows that most of the patients who visited the traffic accident clinic of a Korean Medical Hospital presented neck and low back pain, and the majority showed improvement without surgical treatment. Following the increasing minor injury rate caused by traffic accidents, we expect the role of Korean Medicine Hospital to become more prominent.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.19 no.4
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• pp.375-379
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• 1986

A culture experiment of the ark shell, Anadara broughtonii, one of the edible clams, was carried out in Yoja Bay located at the south ern coast of Korea to find the state of growth and any problems which influence them. Seed shells at an average length of 2.5cm and a weight of 2.5g were planted on bottom mud with a density 20 to 40 shells per square meter on March 10 and 11, 1982. Shell length, shell height, shell breadth, meat weight (wet weight), and total weight for six months from August 1982 to February 1983 were measured to find their state of growth. At the same time, the survival rate was investigated during the whole culture period through December 1983 when they were harvested. Growth, on the whole, was fast when water temperature was high. For a year, an average shell length and total weight attained to 6.1 cm and 63.0g respectively and meat weight was gained to 19.5g. It showed that the state of growth was favourable. Shell shape became round from the oval ana meat weight increase was faster than shell growth as time goes by regardless of water temperature while both shells and total weight increased faster during high temperature. A month after seed shells were planted, about $30\%$ of them was dead and a high mortality, say $5\%\;to\;8\%$ per month, was kept till September. It dropped to around $2\%$ aften divers eliminated starfish, Asterias spp., in August. Thereafter, the rate maintained through December. In all, the final survival rate was about $10\%$ at the time of harvest in December 1983. It was caused mainly by starfish predation. Therefore, a best way for satisifactory culture is seemed to find a way to get rid of the starfish.

• Microbiology and Biotechnology Letters
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• v.41 no.3
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• pp.292-299
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• 2013

In this study, we analyzed the changes in fungal populations of red-pepper fields employing eco-friendly farming methods, such as microbial agents and crop rotation, by using polymerase chain reactions coupled with denaturing gradient gel electrophoresis (PCR-DGGE). Primer specific for fungi were used to determine the contribution of domains to the microbial community. Analysis of planted and non-planted soil samples applying PCR-DGGE technology offered evaluation of long-term patterns in fungal species richness. To evaluate the stability of DGGE patterns from different soils, comparison of planted and non-planted soil samples were compared using PCR-DGGE. The number of DNA fragments obtained from all planted soil samples by DGGE separation was far greater (14 to 15 bands) than that of the non-planted soil samples (3 to 4 bands). In addition, 14 bands were observed from crop continuation soil treated with agrochemicals and 18 bands from crop rotation soil treated with microbial agents. The PCR-DGGE analysis suggests that the use of crop rotation and microbial agents benefits the fungal community more than crop continuation using agrochemicals. These results indicate that crop rotation with microbial agents was better able to support beneficial organisms, enable more effective biological control and maintain a healthier balance of nutrients, organic matter and microorganisms.

• Research in Plant Disease
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• v.23 no.1
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• pp.56-59
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• 2017

During growing season of 2011 to 2013, Sclerotinia rot symptoms consistently have been observed on basil in Yesan-gun, Chungcheongnam-do in Korea. The typical symptom formed initially brownish spot on leaf and stem, and then advancing margins, wilting the whole plant and blighting, eventually died. On the surface of diseased lesions was observed cottony, white, dense mat of mycelial growth, and sclerotia ($30-100{\mu}m$ diameter) formed on stem and leaf. Morphological and cultural characteristic on potato dextrose agar, color of colony was white and colorless chocolate, sclerotium of irregular shape of the oval was black and $5-50{\mu}m$ diameter in size. In pathogenicity test, necrosis and wilt of the inoculated stem were observed in all plants and the pathogen was reisolated from stems. On the basis of mycological characteristics, pathogenicity, and internal transcribed spacer rDNA sequence analysis, this fungus was identified as Sclerotinia sclerotiorum. This is the first report of Sclerotinia rot on basil caused by S. sclerotiorum in Korea.

• Tunnel and Underground Space
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• v.19 no.5
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• pp.373-387
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• 2009

Considering the current construction technology and research status of deep repository tunnels for radioactive waste disposal, it is inevitable to use cementitious materials in spite of serious concern about their long-term environmental stability. Thus, it is an emerging task to develop low pH cementitious materials. This study reviews the state of the technology on low pH cements developed in Sweden, Switzerland, France, and Japan as well as in Finland which is constructing a real deep repository site for high-level radioactive waste disposal. Considering the physical and chemical stability of bentonite which acts as a buffer material, a low pH cement limits to $pH{\leq}11$ and pozzolan-type admixtures are used to lower the pH of cement. To attain this pH requirement, silica fume, which is one of the most promising admixtures, should occupy at least 40 wt% of total dry materials in cement and the Ca/Si ratio should be maintained below 0.8 in cement. Additionally, selective super-plasticizer needs to be used because a high amount of water is demanded from the use of a large amount of silica fume.

• Korean journal of food and cookery science
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• v.28 no.5
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• pp.559-567
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• 2012

The purpose of this study was to investigate the perceptions of the foodservice industry workers in regard to the use of seasonings and sweeteners in the restaurants. Questionnaires were distributed to 902 foodservice workers of various restaurants. Participants were questioned on their perceptions of both natural and artificial seasonings & sweeteners. Furthermore, they were asked to respond to questions regarding the need of public education and information about the use of seasonings and sweeteners, along with the demographic information. The results showed that 65.7% of respondents used both the artificial seasoning and artificial sweeteners, while 9.9% of respondents used only natural seasonings and sweeteners. The restaurant employees answered that they have tried to reduce the use of artificial seasonings and sweeteners(3.69/5 point). Some of the respondents reported that they have tried to increase the used of natural seasonings and sweeteners(3.54/5 point). There were significant differences in the respondents' perceptions and attitudes on the seasonings and sweeteners by the restaurant type(p<0.05). The respondents perceived the need for education on the safety of artificial seasonings and sweeteners(3.71/5point) and the production process of natural seasonings(3.75/5 point). There was no significant difference in the respondents' perceptions on the need for education of the seasonings and sweeteners by the restaurant type. The findings suggest that education regarding the use of artificial seasoning and artificial sweeteners, as well as cooking methods that use natural seasonings, is needed to reduce the use of artificial seasonings and sweeteners in restaurants.

• Fire Science and Engineering
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• v.29 no.6
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• pp.26-32
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• 2015

The main purpose of this study is to propose a directionfor fire safety education and to discuss the current issues of fire extinguisher training A survey was conducted, and the results show that only 52.1% of homes have a fire extinguisher, whereas over 93% of public and private work places (e.g., schools and businesses) have a fire extinguisher. Approximately 90% of the survey participants had fire extinguisher training experience. However, only 65.8% of the public and private work places conducted fire extinguisher training regularly. 42.5% of survey participants had not been trained in the past year. In the survey result on fire extinguisher knowledge, participants showed a score of 3.95/5.00 for how to use a fire extinguisher and a score of 3.00/5.00 for the meaning of the ABC ratings of fire extinguishers. An independent T-test showed that the "the installation of fire extinguishers in the house" and "regular fire safety education in your group" have influences on the "the knowledge of fire extinguishers" (p < .05).

• Tunnel and Underground Space
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• v.30 no.4
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• pp.271-305
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• 2020

An effect of coupled thermo-hydro-mechanical and chemical (THMC) behavior is an essential part of the performance and safety assessment of geological disposal systems for high-level radioactive waste and spent nuclear fuel. Furthermore, numerical models and modeling techniques are necessary to analyze and predict the coupled THMC behavior in the disposal systems. However, phenomena associated with the coupled THMC behavior are nonlinear, and the constitutive relationships between them are not well known. Therefore, it is challenging to develop numerical models and modeling techniques to analyze and predict the coupled THMC behavior in the geological disposal systems. It is also difficult to verify and validate the development of the models and techniques because it requires expensive laboratory tests and in-situ experiments that need to be performed for a long time. DECOVALEX was initiated in 1992 to efficiently develop numerical models and modeling techniques and validate the developed models and techniques against the lab and in-situ experiments. In Korea, Korea Atomic Energy Research Institute has participated in DECOVALEX-2011, DECOVALEX-2015, and DECOVALEX-2019 since 2008. In this study, all tasks in the three DECOVALEX projects were introduced to the researcher in the field of rock mechanics and geotechnical engineering in Korea.

• Journal of Physiology & Pathology in Korean Medicine
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• v.22 no.1
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• pp.60-81
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• 2008

This thesis is written about the causes, the processes and the treatments of edema. It consists of 31 chapters. Covering 11 chapters, there are prescriptions and constructions. When one of the organs fails to work metabolizing water, you can have edema. It is the result of the accumulation of excess fluid under the skin. Edema most commonly occurs in the head facial, the palpebral portion, the feet and legs or all the body. Sometimes it is accompanied with ascites. There are three classifications in the thesis. First, according to the cause and the symptom of disease, it is divided into 5 types. Type 1. The swelling caused by the disorder of the lungs from the troubling wind. Type 2. The swelling caused by the weak spleen. Type 3. The swelling caused by abnormal condition between the kidneys and the lungs. Type 4. The swelling in abdomen caused by the weak kidneys. Type 5. The swelling (Yellow sweat) caused by the heat inside body as water outside. Second, the swelling and the abnormal symptom of five viscera. Third, the swelling accompanied with menstruation in female and with chilliness. In short, the original textbook is showed that the treatment of edema focuses on the cause and the region of fluid accumulation. When the swelling is in the upper body or the cause of diseaseis outside, the useless humidity can be expelled through sweating. On the other hand, when the swelling is in the lower body or the cause of disease is inside, it is pushed out by urination. In this book, the author presents further treatments. And these treatments are often cited by doctors after ages. Even one of them suggested that the swelling be divided by cosmic dual forces. In spite of many researches, it is too complicate for us to understand the writer’s intend. For that reason, comparing with other medical books and referring to guides explained by doctors, I have studied the textbook to help understand.