• Proceedings of the Korean Geotechical Society Conference
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• 2008.03a
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• pp.127-133
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• 2008

The electrical resistivity methods have been commonly used for figuring out the ground layers. The purpose of this paper, differently from previous methods, is not only to figure out the layers but also to develope a equipment and a method to analyze ground porosity. Equipment has a shape of cone, which can be coupled with drilling rods. A field penetration test was performed to test application in Incheon Chungla area. Through the field test soil resistances were measured. To calculate soil porosity along the depth, Archie's law is applied. The results show that a new equipment and porosity analysis method using Archie's law can distinguish soil layers and precisely measure soil porosity.

• Journal of Korean Tunnelling and Underground Space Association
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• v.10 no.3
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• pp.283-293
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• 2008

A study of interactive ground behaviour due to tunnelling adjacent to existing piles has not been recognized well for the most geotechnical engineers so far. Because this is a very sophisticated boundary condition problem. In this study, therefore, the author has conducted both the laboratory model test and finite element analysis (FEA) to figure out such a complicated ground behaviour related to shear strain formations. Based on the model testing and FEA results, a boundary line which divides into two distinctive shear strain formations in relation to the locations of end-bearing pile tips was proposed. The author believes that the proposed boundary line may be helpful for planning the appropriate tunnel positions for avoiding damage of buildings which supported by piled-foundations in urban areas.

• Journal of the Korean Geosynthetics Society
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• v.16 no.4
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• pp.221-230
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• 2017

We developed a polymer pouch using PVP that is water soluble in the precedent study. Yet melt viscosity was so low that it was not possible to produce hemispheric type which is essential for mass production, therefore we used another material to make the polymer pouch. It enabled to figure out a water-soluble transition and mechanic physical property of PEG that is newly chosen, and to blend the PEG with LLDPE and TALC followed by result. So, we could implement an evaluating property on blended proportion. It is important to find out a proper blending ratio throughout an experiment since its property is different or varied followed by each proportion as a water soluble character is conflict to a solid character. With the blending technique we were able to produce the polymer pouch enhanced for a tensile force and an impact intensity maintaining a water soluble character. We could identify a ground solidity effect of the polymer pouch as a result of a direct shear test using the product developed.

• Journal of Industrial Technology
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• v.25 no.B
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• pp.63-71
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• 2005

This paper is an experimental result of investigating lateral soil movements at piled bridge abutments by using the centrifuge model facility. Three different centrifuge model experiments, changing the methods of ground improvement at bridge abutment on the soft clayey soil (no improvement, preconsolidation and plastic board drains (PBD), sand compaction pile (SCP) + PBD), were carried out to figure out which method is the most appropriate for resisting against the lateral soil movements. In the centrifuge modelling, construction process in field was reconstructed as close as possible. Displacements of abutment model, ground movement, vertical earth pressure, cone resistance after soil improvement and distribution of water content were monitored during and after centrifuge model tests. As results of centrifuge model experiments, preconsolidation method with PBD was found to be the most effective against the lateral soil movement by analyzing results about displacements of abutment model, ground movement and cone resistance. Increase of shear strength by preconsolidation method resulted in increasing the resistance against lateral soil movement effectively although SCP could mobilize the resistance against lateral soil movement. It was also found that installment with PBD beneath the backfill of bridge abutment induced effective drainage of excess pore water pressure during the consolidation by embanking at the back of the abutment and resulted in increasing the shear strength of clay soil foundation and eventually increasing the resistance of lateral soil movement against piles of bridge abutment.

• Journal of Korean Tunnelling and Underground Space Association
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• v.13 no.4
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• pp.305-317
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• 2011

In this study, both the model test and the numerical analysis were carried out to figure out the physical behaviour of the model pile during the tunnelling. As a result, both the vertical and the horizontal displacements were simultaneously occurred in the model pile which is subjected to the working load during the volume loss. Consequently, the phenomenon of inclination took place in the model pile. The degree of inclination of the model pile depends on volume loss due to tunnel excavation, pile tip's offset from the tunnel centre, and bearing ground conditions in which pile tip is located. Therefore, in the planning stage of urban tunnelling not only the ground behaviour with respect to the pile locations, but also the physical behaviour of pile itself should be carefully analysed to avoid damage of adjacent buildings.

• Journal of the Korean GEO-environmental Society
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• v.13 no.6
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• pp.83-90
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• 2012

Generally, the effect of the cement deep mixing method on the improvement of clay ground is far greater than the effect of physical improvement. Although it leads to great improvement strength in the initial stage, there are not many constructional precedents in Korea and it is hard to manage quality according to the cement-clay mixing method. In order to figure out the strength characteristics according to the mixing ratio of cement, sand, and clay and the improvement characteristics of weak ground according to the forms of the specimens to be improved, marine clay was used in this study to conduct the uniaxial compression test and soil bin model test. The test piece specimens for the uniaxial compression test were mixed with sand in a fixed ratio with the criterion of the water cement ratio. The cement was mixed with clay in the ratios of 10%, 20%, 30%, and 40% to the clay weight. The moisture content of the soil ground was made in the ratios of 40%, 60%, and 80%. The test piece specimens went through curing by moistening for 7, 14, and 28 days and underwent the uniaxial compression test according to the curing period. For the bearing test, the soil bin models were made and the ground improved in the Mat type was formed. After that, the bearing strength was compared in this study according to the improvement ratio and analyzed the intervening effect between the walls of the improved specimens.

• Journal of People, Plants, and Environment
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• v.22 no.3
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• pp.321-332
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• 2019

The purpose of this study is to investigate the changes of sensory and visual perception of children with intellectual disabilities by conducting psychomotorik (psychomotor activity) in the forest and indoor treatment rooms. Accordingly, this study divided 18 children with intellectual disabilities living in the facility for persons with disabilities located in Seoul into three groups: the experimental group participating in psychomotorik in the forest, the comparative group participating in psychomotorik in the treatment room, and the control group without any treatment at all. The program was conducted for 32 weeks, 4 hours a month. The results showed that psychomotorik promoted the sensory and visual development of children with disabilities. Psychomotorik in the forest showed significant effects on touch and activity level, form constancy and eye-hand coordination. Psychomotorik in the treatment room showed significant improvement in figure-ground with reduced motion. This suggests that psychomotorik in the forest as well as indoors is a positive factor for sensory adaptation reaction and visual development of children with intellectual disabilities.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.34D no.3
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• pp.9-16
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• 1997

A 23GHz 1-stage LNA was designed by using new topology of coupled line type with EEsof softwares and modified by using MPIE numerical analysis. The parallel coupled filter-type matching sections give impedance matching and DC blocking simultaneously, and have small discontinuities. This matching scheme has simple structure in the design process and give small error. The EFT chip was directly attached to the ground metal. The designed LAN gives 6.2dB gain and 2.5dB noise figure without considering the loss of connectors. Through these results, it was verified that our design process, matching schemes and fabrication technologies was valied for developing 20GHz-band LNA.

• Journal of the Korean Institute of Telematics and Electronics
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• v.25 no.9
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• pp.1091-1101
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• 1988

In this paper, a method to segment each character and extract figure from Korean documents is proposed. At first, each character string is extracted by means of iterative horizontal propagation, shrink algorithm and run-length algorithm. Individual character region is extracted by iterative horizontal and vertical manipulation. Next, characters of right pitch are searched. Each character is segmented by the position information. Overlapped character is segmented on the ground of the width of already extracted character. The rest are extracted as special characters of half pitch. Using 9 data input in the form of 840 X 600 from Korean monthly magazine, experiment was simulated. Extraction rate of character is 100%, and that of individual character is 98%. Judging from these results, efficiency on extracting character region and segmenting individual character is proved.

• Journal of the Korean Society of Food Culture
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• v.33 no.6
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• pp.473-488
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• 2018

The purpose of this study was to review literature on beef recipes, focusing on 20 recipe books published from the late 1800s to 1990s. A total of 119 beef dry-heat cooking were recorded. The most often used cooking were as follows: roasting 54 times, skewering 35 times, stir-frying18 times, pan-frying11 times and deep frying 1 time. The culinary book that the recipes was Hangukeumsik daegwan (1997). ribs, brisket, rump, bottom sirloin, sirloin and tenderloin were used but all beef cuts were marked as 'beef.' Thus, it impossible to figure out which beef cut was used in the recipe. Chili, green onion, egg, tofu and wheat flour were used together as, while soy sauce, salt, sugar, sesame oil, ground pepper, pear juice, honey, chopped green onion, chopped garlic, ginger juice, ground sesame used as. In addition, pine nuts or ground pine-nuts were often used for garnish.