• Journal of The Korean Society of Grassland and Forage Science
• /
• v.4 no.1
• /
• pp.18-22
• /
• 1983

This experiment was performed in order to investigate the effect of the early grazing management on the forage yield and sward composition of oversown pasture. Two levels of the grazing intensity were treated when the grasses were 15cm, 25cm, and 35cm high. It was observed that the treatment C (light grazing intensity at the 25cm grass height) increased the dry matter yield and the botanical composition of the introduced grasses and legumes. From these facts it is suggested that the early grazing management contribute to the high forage yield and good sward composition of the oversown mountainous pasture and can take the place of cutting or other methods economically.

• The Research Journal of the Costume Culture
• /
• v.9 no.3
• /
• pp.485-500
• /
• 2001

The purpose of this study is to develop the formal wear for social activity of dwarf. Second investigation for choices of designs based upon data from the first questionnaire investigation, led us to make proposals for design, pattern production, garment-cutting and dressmaking. The effect of wearing the made-up garments was carefully evaluated in order to establish principles for the development of clothes for dwarf. Conclusion is as follow. Dwarf felt uneasy in conventional street dress. When buying clothes their most important criteria was design wanted clothes that would help them to look taller. Analysis of design preference to complement perceived physical weak points revealed: 'a pink ensemble' comprising of a high-waist, one-piece dress, and a black slacks suit comprising of a striped, single-breasted, tailored jacket, and straight-type slacks and blouse. It was found that a bolero jacket and a high-waist, ankle-length, one-piece dress helped create an optical illusion of increased height, for both the wearer and an observer. A pastel ton-pink, one-piece also created this effect on small bodily types, as well as offering a silky, mellow attractiveness. A suit of a striped, single-breasted tailored jacket, and straight-type slacks and blouse, created the two fold illusion of disguising hip imbalance with the length of the jacket and drawing an onlooker\`s gaze to the wearer\`s face through the tailored collar, they also looked taller due to the stripes.

• Journal of Technologic Dentistry
• /
• v.31 no.4
• /
• pp.15-23
• /
• 2009

The aim of this study was to evaluate the bond strength of using a Au bonding agent applied on cp-Ti and nonprecious metal-gold-ceramic system. Metallic frameworks(diameter: 5mm, height: 20mm)(N=56, n=7per group) cast in Ni-Cr alloy, Co-Cr alloy and cp-Ti were obtained using acrylic templates and airborne particle abraded with $110{\mu}m$ aluminum oxide. Au bonding agent was applied on wash opaque firing as intermediate layer. SEM and SEM/EDS line profile were performed on the cutting the cross-section of the metal substrate-porcelain with intermediate Au coating. Groups were tested using shear bond strength(SBS) testing at 0.5mm/min. The mean SBS values for the ceramic-Au layer-metal combination were significantly higher than those ceramic-metal combination. While ceramic-Au layer-cp-Ti combinations failed to increase bond strength instead of using a titanium bonding porcelain. The appication of using Au intermediate layer significantly improve the bond strength combination with metal-ceramic system.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 1998.10a
• /
• pp.125-133
• /
• 1998

Nine tubes with trapezoidal integral-fins having fin densities from 748 to 1654fpm and 10,30 grooves and finned tubes with caves of 0.55 and 0.64mm height respectively are tested. A plain tube having same diameter as the finned tubes is also tested for comparison. In case of condensation CFC-11 condensates at saturation state of 32$^{\circ}C$ on the outside surface cooled by inside cooling water flows. And in case of boiling the refrigerant evaporates at a saturation state of 1bar on the outside tube surface and heat is supplied by hot water which circulates inside of the tube. The tube having fin density of 1299fpm and 30grooves has the best condensation overall heat transfer coefficient. However, as far as boiling heat transfer coefficient concerns, fin tubes with cave show higher value than low fin tube having fin density of 1299fpm and 30 grooves.

• Journal of the Korean Institute of Landscape Architecture
• /
• v.27 no.2
• /
• pp.41-50
• /
• 1999

The purpose of this study is to find out the changes in geomorphic characteristics of a small watershed when a golf course is constructed. The research site is a set of seven small watersheds including an 18-hole golf course that were randomly selected. The size, shape, and drainage network of watersheds were measured by using planimeter, watershed eccentricity, and stream order, respectively. In addition, a 25m$\times$25m mesh was used on topographic maps and grading plans in order to obtain the slope, elevation, and aspect of the watersheds. The major results of this research, while investigating of the changes in geomorphic characteristics of watersheds when a golf course is constructed, are as follows: 1. The size of watersheds is increased in accordance to the difference in elevation between the golf course site and the small watershed. 2. The watershed eccentricities are in general similar except for a few low-valued cases. 3. The changes in the average altitude and the gradient are more drastic with their bigger original values. 4. The aspects are changed more with decreasing elevation. 5. The stream order decreases in the case of a low watershed eccentricity. 6. The surface modification has a closer relationship to the slope rather than the size of effective use area. 7. With a steeper gradient and an excessively low gradient, the height of cutting/filling is increased.

• Journal of the Korean Society for Precision Engineering
• /
• v.33 no.11
• /
• pp.905-910
• /
• 2016

Infrared (IR) optic lens can be fabricated by a single point diamond turning (SPDT) machine without subsequent polishing process. However, this machining process often leaves micro-cracks that deteriorate the surface quality. In this work, we propose an experimental design to remove micro-cracks on IR lens. The proposed design gathered data between cutting process condition and Rt surface roughness. This is of great importance because the scale of micro-cracks is a few micrometer. Rt surface roughness is suitable for analyzing maximum peak height signals of the profile. The experimental results indicate that feed per revolution variable is one of the most dominant variable, affecting the generation micro-cracks on IR lens surfaces.

• Journal of the Korean Society for Precision Engineering
• /
• v.19 no.9
• /
• pp.166-171
• /
• 2002

The objective of this paper is to investigate the effect of clearance and the configuration of die system on burr formation by FEM analysis and experimental tests. Compared with casting, forging and machining, shearing has been known, especially in heavy or mass-production industries, as a very economical and fast way to obtain the desired shape Recently, the shearing process becomes widely used in the small and light electronic component manufacturing industries. When shearing a part of sheet metal, the burr formed on the cutting edge is usually unavoidable. The burr would not only degrade the precision of products but also causes additional cost for the deburring process. In this paper, the influence of shearing parameters such as clearance and configurations of the lower pad (ejector) on burr formation is investigated by using the experimental and numerical approach. From the experimental results, it has been shown that the more narrow clearance gives the smaller burr height and the higher shearing forces. The removal of lower holder also makes the sheared surface integrity and the dimensional accuracy become worse. The FEM results (using DEFORM-2D) show good agreement with the experimental results.

• Magazine of the Korean Society of Agricultural Engineers
• /
• v.23 no.1
• /
• pp.86-102
• /
• 1981

The soil test data of 28 earth dams, scheduled to be constructed in Kore3, were selected for this study. The safety factors of their side slops were computed using Fellenius' "slice Method" by computer. The results summarized in this study are as follows; 1. Dam sections can be easily determined by fig.10 without a time consuming trial and error calculations of assumed sections. 2. For the economical design of earth dam sections, it was found that more cohesive soil was suitable for lower dams(dam height less than 25m) and soils with a higher friction angle was better for higher dams 3. In the case that used soil materials have the same Internal friction angle, side slope increase was almost same. 4. The relationship between side slope and friction angle was found as log.S=a tan ø+b (Fig. 7) 5. The relationship between side slope and cohesion (c) was also found as log. S=a c+b (Fig. 8) 6. The change of safety factors due to the change of central core materials was very little (Table-2) 7. The decrease of safety factors according to the unit weight increase of embankment materials was negligible. 8. In general the relationship between the wet unit weight and the saturated unit weight was r sat = (rt)$^2$+0. 140. This study will contribute to the determination of economic and safe planning and designing of earth dams, embankments and cutting side slopes.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• v.9 no.1
• /
• pp.551-554
• /
• 2005

In this Paper, a super wide-band EM wave absorber was designed by attaching pyramidal type absorber on a ferrite absorber. The used ferrite absorber was in hemisphere type on a cutting cone-shaped absorber. As a result, the bandwidth has been broadened from 30 MHz to 18 GHz and the total height of the EM Wave absorber is relatively low profile of 14.26 cm.

• International journal of steel structures
• /
• v.18 no.5
• /
• pp.1483-1496
• /
• 2018

Negligible research has been conducted to date on how to analyse weakened columns, thus safety risks are still involved when structures are weakened prior to demolition. There are various methods available for demolishing steel structures. One of the most effective methods that has been developed involves pre-cutting steel columns at a certain height, so that the least effort can be used to collapse the structure by means of pulling out some of the columns. This paper presents (a) an experimental setup developed to test the capacity of axially loaded weakened columns, which is used to (b) validate a finite element (FE) model. The two pre-cuts that are presented in this paper are (1) the double window cut and (2) the triangular window cut, which are both commonly used in industry. A column weakened with a double window cut or triangular window cut reduces the axial load capacity by up to 50 and 40%, respectively. The FE models developed predict the axial failure load of weakened columns for a double window cut and triangular window cut are generally within an accuracy of less than 8 and 10%, respectively. It is shown at higher slendernesses the influence of column cuts is less than would be intuitively expected because global buckling becomes dominant.