• Journal of the Korean GEO-environmental Society
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• v.11 no.7
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• pp.51-56
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• 2010

Recently, the land area for many people has been limited because of industrialization and modernization in Korea. The large-scale constructions like the reclamation development projects have been progressed to resolve this problem mentioned above. Therefore, as many of the useful construction materials as possible are needed to perform the largescale construction projects. Many studies for the utilization of pond ash which has a similar characteristic of sand have been conducted and there has been often occurred many structural problems on roadbed in winter. Therefore, the characteristics of the freezing and thawing for Controlled Low-Strength Material(CLSM) using pond ash were analyzed and evaluated by unconfined compressive strength test and mass loss test in this study. As a result of this study, it was confirmed that new CLSM using pond ash with cement(8.2% by weight) was able to stand for the freezing and thawing behavior and was satisfied with the standard of Portland Cement Association.

• Journal of Food Hygiene and Safety
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• v.5 no.3
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• pp.85-98
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• 1990

Microbiological quality of packaged meals (Dosirak) was assessed in three operations under the both conditions of actual food processing and simulated time-temperature. Time and temperature data indicated that all the phases after cooking were critical for microbiological quality control. Microbiological test results by simulated time-temperature conditions revealed that microbiological quality of packaged meals decreased as the storage time and temperature increase. Delivery practices without refrigeration in summer and hot-holding below $60^{\circ}C$ in supermarket were crucial in microbiological quality control.

• International Journal of Highway Engineering
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• v.12 no.4
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• pp.187-196
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• 2010

The purpose of this study is to develop the calibration method for temperature effects to improve the accuracy of the Weigh-In-Motion(WIM) system for collecting long-term truck weight data. WIM system was installed at a location where the truck traffic volume is high and weight data has been collected from January 2010. In this study, as a calibration measure, the first axle weight of Truck Type 10, the semi tractor-trailer is used based on the fact that the first axle weight is relatively constant, independent of the cargo weight. From this fact, calibration equations are developed from the relationship between the axle weight and the temperature(daily mean, maximum and minimum). Analysis on calibrated weight data shows adequacy of the proposed calibration method. Results of this study can be used to improve the accuracy of the WIM system and to carry out more rational design of pavement and bridge structures.

• Water for future
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• v.15 no.3
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• pp.37-47
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• 1982

In the past, the design flow of the urban storm drainage systems has been used largely on a basis of empirical and experience, and the rational formula one of empirical method has been widely used for our country, as well as world wide. But the empirical method has insufficient factor because minimal consideration is given to the relationship of the parameters in the equation to the processes being considered, and considerable use of experience and judgment in setting values to the coefficients in the equation is made. The postcomputer era of hydrology has brought an acceleration development of mathematical methods, thus mathematical models are methods which will greatly increase our understanding in hydrology. On this study, a simple mathematical model of urban presented by British Road Research Laboratory is tested on urban watersheds in Ju An Ju Gong Apartment. The basin is located in Kan Seog Dong, Inchon. The model produces a runoff hydrograph by applying rain all to only the directly connected impervious area of the basin. To apply this model the basin is divided into contributing areas or subbasins. With this information the time area for contributing is derived. The rainfall hyetograph to design storm for the basin flow has been obtained by determination of total rainfall and the temporal distribution of that rainfall determined on the basis of Huff's method form historical rainfall data of the basin. The inflows from several subbaisns are successively routed down the network of reaches from the upstream end to the outlet. A simple storage routing technique is used which involves the use of the Manning equation to compute the stage discharge curve for the cross-section in question. To apply the model to a basin, the pattern of impervious areas must be known in detail, as well as the slopes and sizes of all surface and subsurface drains.

• Proceedings of the Korean Geotechical Society Conference
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• 2010.09a
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• pp.638-645
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• 2010

This study introduces a reinforcement work case using Twin-Jet Method. The area is located behind the abutment of the bridges built on soft clay along the $\bigcirc\bigcirc$ Express Highway. Its foundation was constructed by installing EPS blocks on the original ground to reduce the embankment load under the highway. However, the ground deformation has continuously occurred due to the settlement of the foundation soft cohesive soils. The amounts of subsidences at the surface turned out to be 20~30.0mm, After the pavement patch work on April 23, 2009, a drastic subsidence occurred together with 10mm swell, For this reason, Twin-Jet grout column construction was applied by passing through the EPS banking blocks without closing traffic flows on the express highway. The outcomes of core sample tests after reinforcing the ground turned out to be TCR 92.5%, RQD 64.6% and unconfined compressive strength 2.3~8.6Mpa. The test results showed that the condition of the ground foundation had improved using Twin-Jet grouting in most layers of ground including the cobble and gravel layer.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.12
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• pp.3910-3918
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• 2009

This study was carried out to investigate consumer's purchase behaviors of pork. Questionnaires from a total of 253 housewives were analyzed Jan. to Feb. 2008. The average of preferences for domestic and imported pork were $4.07{\pm}0.81$ and $2.21{\pm}0.96$ scores of 5 points, respectively. Consumers (56.4%) liked belly of pork very much. Consumers (45.4%) purchased a great deal of pork in big discount mart. Consumers (40.2%) responded that they indicated quality reliability as the choice factors for determination of purchasing pork. Respondents (54.6%) hoped the wrapping pork pack of 600 g. The evaluation of the perception for carcass grading system and quality reliability for brand-pork averaged $2.97{\pm}0.88$ and $3.47{\pm}0.60$ scores of 5 points, respectively.

• Journal of Mushroom
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• v.5 no.1
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• pp.21-24
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• 2007

A new variety of oyster mushroom 'Choengsan' was developed with crossing between monokaryotic strains derived from Suhan and Wonhyoung #3. It was developed by Agriproduct Processing Experiment Station, Gangwon Agricultural Research & Extension Services in 2006. The optimum temperature of mycelial growth was around $27{\sim}28^{\circ}C$ and that of fruiting body was $14{\sim}17^{\circ}C$. The color of pileus was dark-gray color. The period of primordial occurrence was about 20 days in bed cultivation using cotton waste and the yields were $38kg/3.3m^2$.

• Research in Plant Disease
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• v.21 no.4
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• pp.268-272
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• 2015

Bacterial leaf blight caused by Pseudomonas syringae pv. porri is one of the major bacterial diseases of garlic (Allium sativum). In South Korea, the disease has only been observed in garlic-growing regions of Jeju island. The spatial distribution pattern of the disease was analyzed by binary power law, in which the natural logarithm of the observed variance is regressed on the natural logarithm of the binomial variance. The estimated slope (b=1.361) of the regression was greater than 1 which meant that the diseased plants were aggregated. The sequential sampling plans were developed for estimating the mean incidence rate ($p_m$) and classifying the mean incidence as being below or above the critical incidence rate ($p_t$). These results could be used on more efficient and higher precisive sampling for bacterial blight of garlic compared to fixed sample sized sampling.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.37 no.3
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• pp.603-610
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• 2017

Various type of pavement deterioration such as crack, bumpy, pothole is rapidly increasing according to the accelerated environmental changes like heavy rainfall, frequent snowing, difference temperature, etc. Accident related to pothole that cause fatal traffic accidents has been increased more than five times over the next five years starting from 2008. As direct or indirect damage by pothole which caused injuries and car damages increases every year, quicker and more efficient management measures are necessary. This study presents the algorithm for materials quantity take-off. The algorithm was suggested by correlation in pothole size and area. Suggested algorithm were confirmed the validity through the 15 field survey in capital area. According to the results of survey, usually the residual materials at which 5~7 kg was generated decreased to 1~2 kg. It showed that automatic pothole detection system is expected not only to reduce materials and resources, but also to contribute to quality improvements of pavement through more accurate material take-off from the situation of constructing rely on their own judgement.

• Journal of The Korean Society of Grassland and Forage Science
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• v.19 no.2
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• pp.155-158
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• 1999

Alfalfa grows wild in some parts of Korea, but specific information is lacking as to its growth characteristics, nutritive value and dry matter yeild. The objective of this study was to evaluate the usefulness of wild alfalfa(Medicago sativa L.) as a forage. Wild alfalfa and 'Vernal' were field sown at Keongsan, Keongbuk in the spring of 1995. Emergence for 'Vernal' was better than for wild alfalfa. It was observed that the flowering date of the wild alfalfa was delayed by 8 days. Regrowth of 'Vernal' was better than that of the wild alfalfa at each harvesting. After the last harvesting date, September 22, there was poor regrowth of the wild alfalfa, but regrowth of 'Vernal' was moderately vigorous growth. Weed infestation in the wild alfalfa plots was higher than in the 'Vernal' plots. Thle dry matter yields per hectare were significantly(P<0.05) higher for 'Vernal' than for the wild alfalfa. The CP content was slightly higher in the wild alfalfa in comparison to 'Vernal'. NDF and ADF contents were lower in the third cut, but they were not different in the 1st and 2nd cuttings.