• Journal of the Institute of Electronics Engineers of Korea SC
• /
• v.38 no.5
• /
• pp.33-41
• /
• 2001

The digital iron using ${\mu}$ processor is designed and compared experimentally with the conventional analog Iron. Designed digital iron shows two improved temperature control characteristics. First, the reduction of the difference error between the user setting temperature and the real temperature of the iron tip is examined. When the iron temperature is set to $200[^{\circ}C]$, $300[^{\circ}C]$, $400[^{\circ}C]$, $480[^{\circ}C]$ at the environmental temperatures of $-5[^{\circ}C]$ and $25[^{\circ}C]$, it is examined that the tip temperature is very stable and its error is within ${\pm}1.8[^{\circ}C]$. Second, it is conformed that the temperature fluctuation of the iron due to the soldering is reduced manifestly. When the temperature of iron tip is varied from $200[^{\circ}C]$ to $480[^{\circ}C]$ with 1[g] solder, the temperature errors of the analog iron are measured to be from $6[^{\circ}C]$ to $10[^{\circ}C]$. In case of designed digital iron, however, these errors are much smaller and they are from $2[^{\circ}C]$ to $5[^{\circ}C]$.

• Asian Journal of Turfgrass Science
• /
• v.26 no.1
• /
• pp.1-7
• /
• 2012

Field experiments were conducted to evaluate the morphological characteristics and growth rates of 101 medium-leaf type zoysiagrasses (Zoysia spp.) collected at the major sod production area (Jang Seong Gun) in South Korea. Collected lines with distinctive morphology and visual growth rate were planted in plastic pots and measured morphological characteristics under the plastic house conditions. Variation of leaf width, plant height, leaf angle, length of leaf sheath, trichome, stolon length, and color were measured. Six lines were selected by evaluating growth rates from one hundred one collected lines. Eight standard cultivars and three other superior lines previously collected were compared to 7 selected lines form Jang seong area by checking growth rates and morphological characteristics. Average leaf blade width was 3.4 mm, leaf angle was 45.8 degree, plant height was 21.6 cm, height of lowest leaf was 5.0 cm, and length of leaf blade was 14.1 cm. Ground cover rates of selected lines 'CY6097' and 'CY6069' were 70% and 68.3%, respectively. These are believed to be faster than 60% ground cover rate of zoysiagrass 'Anyang', and also, twice as faster than the 31.7% ground cover rate of Z. matrella. Selected line 'CY6069' showed fast growth rate with shorter internode length (5.1 cm) compared to zoysiagrass 'Anyang'. Based on the results of this study, we could select useful fast growing zoysiagrass breeding lines from the major sod production area (Jang Seong Gun) in Korea.

• The Journal of Korean Institute for Practical Engineering Education
• /
• v.2 no.1
• /
• pp.95-105
• /
• 2010

This means that development of industrial society has brought pains not only to workers themselves but also to their family due to various disasters, while it changed us to be affluent and improved the quality of life. The purpose of this study is to make the preliminary data for understanding the efficiency of the educations through examination of the existing state in performance about education programs for supervisors, which are in-house educations performed by the company itself and consignment educations performed by outside professional education institutions, in industrial safety and health education programs for prevention of industrial disasters and analysis on survey research of supervisors working at Anyang area to find out whether or not the in-house education and consignment education in education programs for supervisors have statistically significant differences in their ages, classification by industry, the completion number of educations, the number of regular employees regarding duties of supervisor determined by the Industrial Safety and Health Act. As the result of study, this study resulted in that consignment education performed by professional education institutions would be more helpful for improvement of job competence than in-house education performed by company itself. This can be interpreted that consignment education performed by professional education institutions has reacted more flexibly to continuous revisions of the Industrial Safety and Health Act and also more faithful to demand survey by consumers not being tied down by the conventionality for continuous development and study of the curriculum than that of in-house education.

• Journal of the Korean Electrochemical Society
• /
• v.11 no.4
• /
• pp.289-296
• /
• 2008

Electrochemical studies were performed by a half-cell test for the nickel hydroxide (cathode) and hydrogen storage alloy(anode) electrodes for the sealed Ni-MH batteries applicable to industrial use. The electrodes were fabricated and checked a charge efficiency and an internal pressure of the battery during charge-discharge cycling. In order to reduce the internal pressure of the sealed Ni-MH battery, cyclic voltammetry (CV) were performed on the electrodes of nickel hydroxide(cathode) and hydrogen storage alloy(anode), respectively. The results of the test showed clearly the oxidation/reduction and oxygen evolution reaction in a nickel hydroxide electrode and the hydrogenation behavior of a hydrogen storage electrode. The sealed Ni-MH battery of 130Ah was fabricated by using nickel hydroxide of a high over-voltage for an oxygen gas evolution and hydrogen storage alloy of a good performance for activation The battery showed a good characteristics such as a high charge efficiency of 98% at 1 C charge current, a low level internal pressure of 4 atm on a continuous over-charging and a large preservation capacity of 95% at 400 cycle.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.11 no.2
• /
• pp.21-28
• /
• 2012

The continuous deployment of Urban Traffic Information System (UTIS) in Korea has increased the need for developing more practical applications utilizing the standard functions of UTIS facilities installed on urban arterials beyond its basic applications like gathering traffic data and providing traffic information. The UTIS-based bus signal priority may be one of UTIS-based applications meeting such demands. However, the studies on BSP have not been sufficient for actual field deployment in terms of theories and algorithms so that there have been few actual installations on real urban arterials. Thus, this study was aimed at developing a UTIS-based bus priority signal system and evaluating its effectiveness through a field study. To this end, this study presents the system development processes by dividing the UTIS-based bus priority signal system into hardware and software. In addition, the positive effectiveness of the UTIS-based bus priority signal system was verified through a field application test which was conducted at Gyeonggi Global Trade High School intersection.

• Journal of the Korean Society of Food Culture
• /
• v.9 no.4
• /
• pp.395-400
• /
• 1994

The objective of this study was to investigate the chemical properties of fermented youbsak sauce to use as a source of the flavor and taste enhancement for kimchi preparation. The pH and total acidities of fermented youbsak sauce were not greatly changed during fermentation. The contents of volatile basic nitrogen and amino type nitrogen were gradually increased during one year fermentation, from 63.7 mg% to 224.8 mg% and from 352.5 mg% to 851.7 mg%, respectively. Acid value were increased until 120 days of fermentation and then it was slightly increased up to 44.3. In fatty acids composition, saturated fatty acids were slightly increased during the fermentation, but unsaturated fatty acids were gradually decreased. Palmitic acid was the most abundant fatty acid and followed by oleic acid, palmitoleic acid, myristic acid and eicosapentaenoic acid. The major amino acids in the early stage of fermentation were arginine, glutamic acid, alanine, leucine and valine, while fermentation progress, the amounts of glutamic acid, lysine, phenylalanine increased. Finally, glutamic acid, lysine, phenylalanine, arginine and alanine became the major amino acids after one year fermentation.

• Korean Journal of Soil Science and Fertilizer
• /
• v.14 no.1
• /
• pp.31-36
• /
• 1981

This pot experiment was conducted to find out the optimal fertilization ratio of the anions (N : S : P) in various soil conditions. Soil samples were collected from uncultivated mountains and hills where development for grasslands is under consideration. The optimum ratios were computed by the $Hom{\grave{e}}s$ systematic variation technique. The results were summarized as follows : 1. The optimum fertilization ratios of the anions (N : S : P) for the high yields of grass - clover mixed sward at various areas were obtained (Table 5). 2. The grass yields in mixed sward were increased by the increase of specific soil characteristics, CEC, OM, T-N, avail-$P_2O_5$. However. it was not recognizable by the contents of the cations, the base saturation, and the pH. 3. The relatively high yields of clover were positively related to the Ca and Mg contents in soils, and it was a factor of the increased total yields of mixed sward. 4. The relatively high optimum fertilization ratios of S in volcanic ash soil in the Cheju district and P in sediment lithosol in Daegu should be taken into account in determing the fertilization rate for high yield of clover in mixed sward.

• Korean Journal of Ichthyology
• /
• v.28 no.1
• /
• pp.35-40
• /
• 2016

The microhabitat of Iksookimia hugowolfeldi was surveyed in two sites, Geogeum Island and Jangheung. I. hugowolfeldi in Geogeum Island inhabits mainly pool. This water system consists of sand and cobble and has a shallow water (0.1~0.8 m depth) with slow currents (0.1 m/s). 0+ years old inhabits pool consist of sand and lives in a less than 0.3 m depth. I. hugowolfeldi in Jangheung population inhabits mainly pool consists of sand and cobble and lives in a shallow water (0.1~0.8 m depth) with slow currents (0.1 m/s) compared to the stream of Geogeum Island. With some different fish species, sympatric species collected at Geogeum Island and Jangheung population are 7 species in 4 family identically in the two sites.

• Journal of the Korean Geographical Society
• /
• v.43 no.4
• /
• pp.544-560
• /
• 2008

This study seeks to clarify the background and factors for the expansion of bus networks that connect Incheon International Airport with its hinterlands. For this research objective, this paper analyzes the relationships among the change of bus routes, competitive transportation modes, passenger fares, and the shortest time distance. Previously, the hinterlands of route bus networks that connect Gimpo International Airport were Seoul metropolitan area, Chungcheong region, Jeonju and Iksan in Jeollabuk-do(province). However, the opening of Incheon International Airport resulted in the expansion of the hinterlands of bus networks to Gangwon-do, Gwangju, and major cities in Youngnam region. Simultaneously, route bus networks also expanded in Seoul metropolitan area. Each bus route connecting Incheon International Airport with its hinterlands was opened by a single bus company or various bus companies. In many cases, due to the uncertainty of revenues or bus company's regional ties, a bus route was opened by various bus companies. In this paper, the analysis of the number of one-way route bus service and density of flight passengers shows that the frequency of the route bus service for Seoul except Gangseo-gu(ward) and for Seoul's satellite cities(Suwon, Seongnam, Anyang, Gunpo, Guri, and Osan) should be decreased. The analysis also shows that the frequency of the route bus services for the other cities, counties(Guns), and wards(gus) should be increased. In Seoul metropolitan area, although route bus fares are more expensive than subway fares, passengers use route bus more frequency than subway because time distance of route bus is shorter than that of subway and subway transfer is inconvenient. In general, outside Seoul metropolitan area, air flight is preferred in the regions that have airports. In contrast, the route bus is preferred in Daegu and other regions that do not have airports.

• Journal of Korea Water Resources Association
• /
• v.41 no.9
• /
• pp.943-958
• /
• 2008

This study employs Bayesian regression analysis for fitting discharge rating curves. The parameter estimates using the Bayesian regression analysis were compared to ordinary least square method using the t-distribution. In these comparisons, the mean values from the t-distribution and the Bayesian regression are not significantly different. However, the difference between upper and lower limits are remarkably reduced with the Bayesian regression. Therefore, from the point of view of uncertainty analysis, the Bayesian regression is more attractive than the conventional method based on a t-distribution because the data size at the site of interest is typically insufficient to estimate the parameters in rating curve. The merits and demerits of the two types of estimation methods are analyzed through the statistical simulation considering heteroscedasticity. The validation of the Bayesian regression is also performed using real stage-discharge data which were observed at 5 gauges on the Anyangcheon basin. Because the true parameters at 5 gauges are unknown, the quantitative accuracy of the Bayesian regression can not be assessed. However, it can be suggested that the uncertainty in rating curves at 5 gauges be reduced by Bayesian regression.