• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.39 no.3
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• pp.181-188
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• 2003

The objects of this study were to discuss the performance of its using magnetic compass and to do a trial manufacture of the apparatus generating artificial magnetic field of 3-axis type to assess the performance of compass using terrestrial magnetism in the various magnetic field. The results obtained were summarized as follows: The magnetic field of each axis showed the linearly increase in accordance with the increase of electrical current. Average range difference between measured and calculated values was 0.33∼1.93μT and there were no big difference. The magnitude and direction of magnetic field showed some change in the edge of Helmholtz coil, but it appeared to stabilize in the center. In the horizontal magnetic force of 0.30gauss and 0.40gauss, the measured and calculated values of the damping characteristic of magnetic compass showed a good agreement. However, the confidence level was low at the horizontal magnetic force of 0.50gauss.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.23 no.4
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• pp.367-374
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• 2005

Recently, forest damage has occurred often and made big issues. Among them, the damage by forest fire is not only damage of itself but also being connected with secondary damage like a flood. This is the fact that a forest fire is caused rather artificially by people than nature. In this study, we try to investigate damage of a forest fire through spectral reflectance of a plant community surveyed using a near infrared CCD camera and a SPM (Spectral Radiometer) as advanced work to use satellite image data. That is, damage of a forest fire by the naked eye observation was divided into the No damage, the light damage, the serious damage and we estimated activity of forest and grasped revival possibility of forest. Through correlation analysis between the spectral reflectance by SPM and the near infrared CCD camera, we could get high correlation in the No damage and light damage. Therefore, when we surveyed damage of a forest fire, we could grasp damage, that is hardly observed by the naked eye by, using jointly the spectral radiometer and the near infrared CCD camera.

• Journal of the Korean Society of Hazard Mitigation
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• v.9 no.4
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• pp.53-59
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• 2009

The purpose of this research is particle shape evaluation of granular soil and aggregate using Digital Image Process(DIP). DIP is very useful to measure the roughness and particle shape of aggregates. Couple of aggregates, like standard sand, two different crushed stones, and two different marine aggregates, have been employed. Shape factor of two different marine aggregates is ranged 0.35 to 0.54. Crushed stone I is that of 0.74 which is highly flat, but standard sand is elongated shape. Especially, two marine aggregate showed a big difference of width and length which meaned a long shape. There is any significant difference of elongation ratio and flakiness for each aggregate with different measuring system, like direct measurement of vernier calipers and DIP method. Within the limited test results, DIP is one of useful to get the particle shape of aggregate with limitation of measuring errors and to apply the particle distribution curve.

• Journal of the Korean Society for Precision Engineering
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• v.17 no.10
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• pp.155-161
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• 2000

Recently, environmental pollution has become a big problem in industry and many researches have been done in order to preserve the environment. In the grinding process, the coolant has great influence on environment. It contains several chemicals(sulfur, phosphorus and chlorine) to improve the grinding efficiency. If these additives go into the workplace atmosphere, it is harmful for workers. It can also cause the environment pollution. Because of these reasons many studies have been done to minimize the amount of coolant. However the small amount of coolant can cause the thermal defect on the ground surface layer. This study forced the effects of the compressed cold air when the spindle shaft materials(SCM4 & SCM21) were cylindrical ground with WA wheel. The compressed cold air was used as the coolant and grinding performance was compared with that of the conventional grinding fluids(emulsion). Many experiments were carried out with these two cooling materials. The surface roughness, residual stress, and roundness were measured for the cylindrical grinding. The test results showed that the compressed cold air was very useful as the cooling materials for grinding process. It was also efficient to minimize the thermal defects of workpiece and could also play a role in solving environmental pollution.

• Korean Journal of Applied Biomechanics
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• v.13 no.3
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• pp.277-291
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• 2003

This study was designed to examine the kinematic factors in the phase during the marche fente motion. For this study, the subjects were 5 elite male fencing players. The direct linear transformation (DLT) method was used in calculating 3-D coordinate of the digitized body parts. The cubic spline function was used for smoothing and the kinematic data for displacement, velocity, angle variables were calculated for Kwon3d ver 2.1. And the following conclusions were drawn; 1. It show that the marche phase appeared to longer time than the pante phase In the performance time. For the fast attack, it showed that the subjects should be moving in a short stride width. 2. For a fast and stable movement posture in the marche phase, the vertical change of COG must be maintain the same position as possible, but all subjects appeared to decrease the COG because of a excessive the knee flection. 3. In the COG velocity change, all the subjects showed to the same change in both the marche and the fente phase. However in the attack extremity velocity, it increased velocity in order of upper arm, fore arm, and hand in the marche phase, but it showed different velocity among each subjects at the moment of stabbing. So that in order to do effective stabbing, they have to extend their upper extremity max and do faster the distal segment than the proximal segment. 4. It showed to take a fast and stable movement, because some subjects showed the big anteroposterior angle of the trunk flexed max shoulder angle and elbow angle of their attack arm and the other upper extremity.

• Proceedings of the Korean Geotechical Society Conference
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• 2010.09a
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• pp.1122-1129
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• 2010

Various soil tests were performed in the laboratory after soil samples were obtained from natural terrains distributed on the granitic rocks where are located in Mt. Bukhan, Mt. Surak and Mt. Gwanak around Seoul. Through the comparison of soil properties in each mountain, the difference of soil properties in a similar geological condition was investigated. According to the result of soil test, the soils were generally classified into calyey and silty sands with a well grade. Soil densities are ranged from $2.62kg/cm^3$ to $2.67kg/cm^3$, and water contents of soils are ranged from 3.77% to 31.12%. These values are not sorted locally. The wet unit weights of soils are ranged from $1.092kg/cm^3$ to $1.814kg/cm^3$. It has a big difference between the average values because that of Mt. Bukhan is $1.604kg/cm^3$ and those of Mt. Surak and Mt. Gwanak are $1.500kg/cm^3$ and $1.331kg/cm^3$, respectively. The internal friction angles are ranged from $31^{\circ}$ to $39^{\circ}$ and the cohesions are ranged from 1.57kPa to 8.63kPa. The shear strengths are too high and similar in all regions. The coefficients of permeability are ranged from $3.07{\times}10^{-3}cm/sec$ to $4.61{\times}10^{-2}cm/sec$. So, these soils are evaluated as a middle to high permeable ground. On average, the value of Mt. Bukhan is $1.47{\times}10^{-2}cm/sec$ and the values of Mt. Surak and Mt. Kwanak are $1.29{\times}10^{-2}cm/sec$ and $1.66{\times}10^{-2}cm/sec$, respectively.

• Archives of design research
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• v.16 no.4
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• pp.141-150
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• 2003

In 21 century, Game industry became one field of the cultural content industries. Also, It is one of the most important technologies as a Multimedia, 3-D sound, virtual reality field, and character industry and its scale and effect are getting big. But Korea still lags behind America and Japan in developing game. For that, many support business progressed. However, Special importance〔emphasis〕 is attached to the developing of software engines. In the mean time, The game market of children(under 8) is the biggest one, which form over 30% of all the markets in the PC game market of America. The Children's game, which has both entertaining and educating, is a content-concerned industry. So with a short period of the developing time, they make a high value added. In this paper, 1 study the existing computer games and propose for game contents and the game factor's abstraction suited to the character by kid age. It is concluded that 'Asports', 'Asim,' 'U.J RPG', 'S＋RPG' are beneficial to the child growth on each stage, through serveys analysis of protocol, and research of the cjaracters of the growth on the each age.

• Journal of Digital Contents Society
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• v.7 no.4
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• pp.263-269
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• 2006

The trend of the web is moving from portal-centered to user-centered, and RIA(rich internet application) is considered best solution for usability and functionality of the next generation web. But the lack of reference document or technical guide for RIA implementation is a big obstacle for extension of RIA environment to practical business engineer or user. In this paper, I will suggest the implementation conceptand reference site for user-centered environment based on RIA concept. The suggested concept support wire/wireless environment, and use the e-mail that is already used by many company or portal. The contents of this paper will be very helpful to the practical engineer or portal/company that want to use or implement about RIA environment.

• Journal of architectural history
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• v.18 no.4
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• pp.43-62
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• 2009

No.87 Sogong-dong where is the Chosun hotel stand. There was the Nambeol-gung(south ern royal villa) which had been a reception hall for enboys of the toadied country before Hwangudan圜丘壇 being set up in the year 1897. The site of the Nambeol-gung was Gyeongjeong慶貞 princess's a lot for house in the early 15th century. But after princess's death, it occurred property dispute between her son and four daughters. As a result of the dispute, a lot and a house of all the princess's properties reverted to the government. At reverted this lot was established a big royal villa in the year 1583 and that royal villa was granted to Uian prince. The villa reverted to the government again when the Uian義安 prince was dead in 12 years old by an epidemic. After the Imjin Invasion壬辰倭亂, another houses and buildings got to be role as a palace because of all the palace in the capital was burnt down to ashes. Among others Nambeol-gung was brought into play as the royal audience chamber. As well as, the villa became brought out role as a reception hall for enboys of the toadied country instead of a damaged reception hall the Taepyong-gwan太平館. In period when the envoy didn't come, the Nambeol-gung was used to extraordinary office of government like Dogam都監. This situation is to mean that the Nambeol-gung is not the royal villa any more. Because of the Nambeol-gung was built as a royal villa, that spaces were composited like space of house and palace. But this spatial composition and spatial name were not fit to hold a ceremony of government office. After all, Nambeol-gung was used change only the spatial name conform to ceremony of office keep up the spatial composition.

• Korean Journal of Veterinary Service
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• v.33 no.4
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• pp.345-351
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• 2010

Toxoplasma gondii is a species of parasitic protozoa in the genus Toxoplasma. The definitive host of T. gondii is the cat, but the parasite can be carried by the vast majority of warm-blooded animals, including humans. It is often found in the tissues of food animals including pigs and sheep. To determine the regional prevalence of infection with T. gondii, bloods (n=300) from domestic pigs and tissues (n=200) from slaughter pigs in Gyeongnam province were tested using an enzyme-linked immunosorbent assay (ELISA) and a polymerase chain reaction (PCR) for detection of antibody and antigen. A total of 115 sero-positive pigs were identified for a prevalence rate of 38.3%. Of the 50 herds from domestic pigs tested, 34 had at least one sero-positive pig for a herd prevalence rate of 68.0%. Sero-positive rates of pigs in fattening farm were higher than that of pigs in breeding company. Sero-positive rates of sows were higher than that of growing pigs. Seasonally, sero-positive rates of pigs were highest in winter (80.0%) and lowest in spring (23.8%). According to farm size, sero-positive rates of pigs were higher in small size farms (${\leq}$2,000) than that of big size farms (>2,000). However, none of the bloods (n=300) from domestic pigs and tissues (n=200) from slaughter pigs were positive for T. gondii specific DNA by PCR.