• Wind and Structures
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• v.12 no.3
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• pp.205-217
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• 2009

Aerodynamic flutter control for long-span cable-supported bridges was investigated based on three basic girder sections, i.e. streamlined box girder section, box girder section with cantilevered slabs and two-isolated-girder section. Totally four kinds of aerodynamic flutter control measures (adding fairings, central-slotting, adding central stabilizers and adjusting the position of inspection rail) were included in this research. Their flutter control effects on different basic girder sections were evaluated by sectional model or aeroelastic model wind tunnel tests. It is found that all basic girder sections can get aerodynamically more stabled with appropriate aerodynamic flutter control measures, while the control effects are influenced by the details of control measures and girder section configurations. The control effects of the combinations of these four kinds of aerodynamic flutter control measures, such as central-slotting plus central-stabilizer, were also investigated through sectional model wind tunnel tests, summarized and compared to the flutter control effect of single measure respectively.

• Information Systems Review
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• v.3 no.2
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• pp.261-276
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• 2001

The purpose of this research is to review how Korean KM companies are applying information technology to their operations from the four perspectives of knowledge conversion (KC) and to suggest ideas for introducing appropriate knowledge management implementation methodology through the case studies of Korean KM companies that have adopted knowledge management strategy using information technology. This research was conducted focusing on the cases of companies that are carrying out knowledge management by applying information technology and the result shows that Korean KM companies place high value on the application of information technology in introducing knowledge management. However, the use of information technology is not common to all kind of companies in four kinds of knowledge conversion.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.13 no.2
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• pp.116-125
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• 2003

Four models for stick-slip friction are presented and are adopted for a numerical simulation study for a manual transmission clutch damper in idle mode. Meaning of parameters for friction models are explained and proper values are suggested. Also explained ate the reason why those specific values for the parameters are chosen. Preferable model for the clutch damper In Idle mode is discussed in terms of calculation efficiency and fidelity of the model based on real measured data. For clutch damper idle mode simulation studies, all four models perform equally well.

• Journal of the Korean Society for Library and Information Science
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• v.14
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• pp.131-148
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• 1987

The Yi-Dynasty published the calendars printed by means of woodblock and typeprinting for the purpose of informing its people of four seasonal changes and appropriate time for farming. The printing types were used to publish the calendars in those days varied depending upon the kinds of the calendars, but all those types are known as only one name: Kwansanggam Type. This is because there have been little studies on the different kinds of printing types. As a result, there are many cases where the libraries make erroneous notes in their catalogues. This study points up the fact that four different kinds of Kwansanggam Type were used depending upon the nature of the calendars. For classification purpose, I call these types Daetongryokja, Naeyongsamsoja, Myongsiryokja, and Chiljongryokja. What has not been revealed in this study can be further explained as the more calendars of those days are found out.

• Journal of Plant Biology
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• v.18 no.4
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• pp.150-154
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• 1975

Four kinds of Nicotiana species and five varieties belonging to N. tabacum were used as materials for electrophoretic analysis of the tetrazolium oxidase isozyme to examine the taxonomic affinity among them based on the biochemical property. All the five verieties of N. tabacum showed same isozyme bands despite the fact that these varieties had notably varied characteristics including morphological traits. The band patterns were more or less different among the four species. Although N. rustica and N. tabacum were of the same genome group of AABB, their isozyme bands showed considerable difference. N. sylvestris, genome A donor of Nicotiana species, was found to be markedly different from N. tatacum in band pattern, including the absence of system 2 in N. sylvestris.

• Journal of Pharmacopuncture
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• v.4 no.2
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• pp.73-86
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• 2001

Objective : These case study were made to evaluate and observe the treatment for the Herpes-Zoster through the korean oriental medicine. Method : Clinical observation and analysis about 4 cases of Herpes-zoster including the Ramsay's-hunt syndrome had been done the patients of the Sang-Ji Oriental Medicine Hospital. These cases were mainly treated with oriental medicine using the Herb medication, Korean Bee-Venom therapy, Acupuncture and Electro-acupuncture therapy. Acupuncture technic was mainly used Sa-Am acupuncture(Four needle technique). Result : After treatment, all of cases were completely cured without any complication. Conclusion : Based on the clinical results, Korean Oriental Medicine is believed to be effective for treating Herpes-zoster, and further studies should be conducted to provide more valuable information.

• Journal of the Korean Wood Science and Technology
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• v.21 no.3
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• pp.37-44
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• 1993

The collapse of four domestic Fagaceae species was observed in relation with their moisture content(MC), basic density, P (Percent of moisture content saturation of the wood) and Q (Percent of cell cavity volume containing water) and the variation of collapse phenomenon in the cross section of stem was also investigated. The results were summarized as follows : The values of collapse in each species were great in order of Quercus dentata, Quercus variabilis, Quercus aliena and Quercus mongolica and the values were higher in heartwood than in sapwood in all of specimen. MC, basic density, P and Q were important factors which affected on the occurance of collapse and the collapse phenomenon was decreased from pith to bark.

• The Journal of Fisheries Business Administration
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• v.52 no.3
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• pp.1-14
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• 2021

The proportions of both the fishery industry and the gross regional domestic product in the national economy are gradually decreasing. If high value-added processed fishery products suitable for regional characteristics are developed, these proportions can be improved. In pursuit of this, it is first necessary to discover processed fishery products specialized in each region and then establish a development framework for them. In this study, location coefficient was used to find processed fishery products specialized in each region. Then, dynamic shift-share analysis was used to establish a development framework which consisted of four development types of processed fishery products. Based on the magnitudes of the industrial mix effect and the regional shift effect, the supporting strategy directions were proposed for four development types of processed fishery products. The supporting strategy directions were all focused on revitalizing the local economy.

• Nuclear Engineering and Technology
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• v.53 no.6
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• pp.2019-2024
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• 2021

For evaluating the radiological safety of dismantled concrete, the process of disposal and recycling of the radioactive concrete generated during the dismantling of Kori Unit 1 is analyzed. Four scenarios are derived based on the analysis of the concrete recycling and disposal process, and the potential exposure to the workers and public during this process are calculated. VISIPLAN and RESRAD code are used for evaluating the dosages received by the workers and public in the following four scenarios: concrete inspection, transport of concrete by the truck driver, driving on a recycled concrete road, and public living near the landfilled concrete waste. Two worker exposure scenarios in the processing of concrete and two public exposure scenarios in recycling and disposal are considered; in all the scenarios, the exposure dose does not exceed the annual dose limit for each representative.

• Advances in concrete construction
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• v.10 no.6
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• pp.509-514
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• 2020

In the preliminary design phase of explosion-proof structures, the use of P-I diagram is useful. Based on the fact that the deformation criteria at failure or heavy damage is significantly larger than the yield deformation, a closed form solution of normalized P-I diagram is proposed using the complete plastic resistance curve. When actual sizes and material properties of RC structural component are considered, the complete plasticity assumption shows only a maximum error of 6% in terms of strain energy, and a maximum difference of 9% of the amount of explosives in CWSD. Thru comparison with four field test results, the same damage pattern was predicted in all four specimens.