• International Journal of Highway Engineering
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• v.13 no.2
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• pp.187-193
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• 2011

The stormwater runoff from road or expressway is known as one of important nonpoint pollution sources. To reduce the pollutants discharge from road or expressway, many best management practices(BMPs) have been applied and planned. Among the BMPs, road sweeping can be effective way to prevent pollutant washoff to environment. This study is performed to evaluate the characteristics of particles collected from the road by sweeping car. Size distribution and pollutant concentration of particles were analyzed. Based on the pollutant concentration and the specification of road such as length, width, and unit for pollutant generation, total amount of pollutant to be removed by road sweeping was estimated. Most of sediments collected by road sweeping was classified into sandy soil and fraction of fine grained soil was low. Although the concentrations of pollutants such as heavy metals in road sediments did not exceed the soil contamination criteria, washout of pollutants during sweeping work by spraying water might cause leaching of pollutants contained in sediments and thus resulted in low pollutant concentrations. Reduced amounts of pollutant by road sweeping showed 31.4% TSS reduction for ${\bigcirc}{\bigcirc}$ region and 7.7% TSS for ${\triangle}{\triangle}$ region. Other pollutants showed low reduction rate, because of their leaching by water spraying. Results from this study indicate that detailed and well-planned investigation for the road sweeping is necessary for the accurate estimation of pollutant reduction from road or expressway.

• Journal of the Korea Organic Resources Recycling Association
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• v.1 no.2
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• pp.287-298
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• 1993

In this study, generation characteristics and distribution situation of the animal fat residue were investigated to identify it's management problems and to propose alternatives for the recycling and final disposal. Generation sources were the meat distribution net-work including about 170 slaughterhouses, 280 meat-packing plants, thousands of meat shops and restaurants etc. The daily total amount of the animal fat residue is about 700 ton/day. More than 60% of the generation sources were concentrated in Seoul metropolitan area. The residue was collected by about 300 men using old-fashioned devices like handcarts, bike and auto bike, transported to the recycling plants by about 60 collection agencies. The residue was processed to produce by-products such as grease, tallow, animal feed ingredient in the recycling plants. At present, however, a great number of unlicensed, and mostly small rendering processors without having pollution control facilities do the unlawful business. These small, old fashioned and unorganized businesses are creating environmental problems by disposing the waste in improper ways such as open burning and dump. Improvement of the distribution network, the large-scale plants, and the estabilishing proper infrastructures were suggested to overcome the problems for the sound fat residues reprocessing industry.

• Journal of the Korea Organic Resources Recycling Association
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• v.20 no.1
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• pp.31-40
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• 2012

In order to making resources for the organic wastes, it is very important to understand for the life cycle of wastes before the physicochemical analysis and engineering technology. Therefore we try to fine the solution through the interdisciplinary consilience between natural science and social science for the management of refuge in summer resort. Summer visitors of beach answered that fly tipping of refuse was 65.56% and insufficient separation was 17.78% about the survey. But insufficient separation was 42.5% and fly tipping was 37.5% in valley. The survey for the effective methods at reducing refuse was represented that campaign and teaching was 47.78%, fine was 23.33% and using the standard bags was 18.89% in beach. Campaign and teaching was 37.5%, using the standard bags was 37.5% and fine was 15% in valley. Bulk density of refuse in gyeongpo beach was measured in $74kg/m^{3}$. This value was three times as much low than municipal solid wastes. Moreover, the composition of refuses in beach showed that combustible materials was 81.1% and incombustible materials was 18.9%. Moisture, ash and combustibles were analyzed 19.0%, 9.2% and 91.8% respectively.

• Journal of the Korea Organic Resources Recycling Association
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• v.25 no.2
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• pp.15-26
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• 2017

This study was conducted to investigate and analyze the discharge characteristics of recyclable material from S-city, S-district, in order to improve the sorting efficiency in recycling sorting facility. The characteristics of recyclable materials collected were analyzed in three different scopes; source origin, collection and transportation, and sorting steps. The average of recyclable waste generation is $0.121kg/day^*man$. Regional collection period appears to be three times a week, and the density of mixed recyclable wastes showed the average of $202.4kg/m^3$ in the waste collection vehicle. In the analysis into the sorting steps, the average of carrying amount of mixed recycling products is 1,154.6 ton/month, the average of appeared density is $181kg/m^3$, the average amount of separated recycling products is 448.5kg/month, and the density of recycling residue is found out to be $48kg/m^3$. The sorting rate of recyclable material is 38.85% and the percentage of residues is 55.90%. Out of 7,744.8 tons of the total recyclable residues, 4,272.1 tons were found out to be possible recylable materials. As a result of increasing the recycling rate of residues, the encouragement of base-recycling, the automation and retrofit of sorting equipment, and energy recovery from recycling residue were discussed.

• Journal of Veterinary Clinics
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• v.30 no.4
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• pp.223-229
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• 2013

Because colostrum is considered to be the sole source of passively acquired maternal antibodies for calves, newborn calves must consume colostrum to gain disease resistance during their early years of life. Storage of surplus colostrum from dairy cows right after calving and feeding newborn calves in deficiency of colostrum to assure adequate uptake of IgG for protection of the calf has been a common practice in the bovine production. In the current study, 35 colostrums were randomly collected from 3 colostrum banks located in different regions of Korea and monitored for general bacterial contamination and major bovine pathogens. Immunoglobulin concentrations and BVDV-specific antibodies were also determined to evaluate the immune quality of the colostrums. Moderate to severe bacterial contamination (up to 72,000,000 CFU/ml) was observed in most of the colostrums collected from colostrum banks. General immune quality of the colostrums was under the satisfactory level since most of the colostrums contained less than 50 g/L of IgG, which is the minimum concentration for good quality colostrums. Therefore, colostrum for colostrum bank should be collected at the first 2-3 post-partum milkings according to proper harvesting and handling procedures to guarantee the safety and quality of colostrum. In addition, it was recommended that colostrum should be heat-treated before frozen and stored in the bank because pasteurization at $63^{\circ}C$ for 30 min was very effective reducing the risk of disease transmission without causing significant degradation of immunoglobulins.

• Journal of KIISE:Software and Applications
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• v.30 no.1_2
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• pp.58-72
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• 2003

The objects generated by the keyword new in Java are automatically managed by the garbage collector Inside Java Virtual Machine (JVM) not like using the keywords free or delete in C or C++ programming environments. This provides a means of freedom of memory management burden to the application programmers. The garbage collector however. inherently has its own run time execution overhead. Thus it causes the performance degradation of JVM significantly. In order to mitigate the execution burden of a garbage collector, we propose a novel way of dynamic memory management scheme in Java environment. In the proposed method, the application programmers can explicitly manage the objects In a simple way, which in consequence the run-time overhead can be reduced while the garbage collector is under processing. In order to accomplish this, Java application firstly calls the APIs that arc implemented by native Jana, and then calls the subroutines depending on the JVM, which in turn support to keep the portability characteristic Java has. In this way, we can not only sustain the stability in execution environments. but also improve performance of garbage collector by simply calling the APIs. Our simulation study show that the proposed scheme improves the execution time of the garbage collector from 10.07 percent to 52.24 percent working on Mark-and-Sweep algorithm.

• Journal of Animal Environmental Science
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• v.18 no.sup
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• pp.73-80
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• 2012

Nitrogen included in animal manure can be used as organic fertilizer if it is treated properly but it may cause serious air and water pollution without proper management. Significant amount of nitrogen losses happen in the form of ammonia when the manure staying in animal house and storage facilities and being composted and applied to the field. In order to maximize the manure nitrogen utilization, it is important to understand the mechanisms of nitrogen loss during the diverse manure handling and treatment procedures. The plant available nitrogen portion of total nitrogen in excreted manure was evaluated based on animal type, animal manure collection system, manure treatment process, and application method. About 27% of nitrogen included in excreted pig manure could be plant available if it is applied to the filed after composting process. The plant available nitrogen portion varies from 29% (surface application) to 54% (solid injection) based on application method of digestated piggery slurry. Plant can use 18% of manure nitrogen if the composted cattle and poultry manure applied to the field using surface application method. Manure treatment and application methods need to be carefully selected to control and utilize the manure nitrogen properly.

• 재활용회보
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• s.2
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• pp.48-52
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• 2004

우리나라는 약 15년 전부터 종이팩 재활용이 별도로 시도되어 국민의 홍보와 더불어 많은 시민단체 및 환경단체들의 환경과 호응 하에 활발히 진행되어 오다가 지난해에는 종이팩이 EPR제도의 재활용의무품목으로 지정되어 재활용분야에 지원금 등 인센티브제도가 적용되고 있다. 아직까지 우리나라의 종이팩 재활용율은 상당히 낮은 편인데, 근래에 배출 및 수거 쪽으로부터 재활용에 대한 열의가 오히려 식어가고 있는 것 같아 뜻있는 사람들의 마음을 안타깝게 하고 있다. 이에 월간 ‘재활용’지에서는 다시 한 번 현장의 문제점을 진단하여 방안을 제시하고 관련 분야의 인식을 고취시켜 종이팩 재활용율을 향상시키고자 하여 이번 2월호에 종이팩 재활용에 관한 특집과 더불어 업체탐방 코너에 국내에서 종이팩 재활용을 가장 많이 수행하고 있다는 삼정펄프(주)를 소개하고자 한다.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2004.06a
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• pp.242-242
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• 2004

원자력발전소의 운전과정에서 계획적 혹은 비계획적으로 방출되는 미량의 입자상 방사성 물질들은 대부분 원전 부지내 토양에 침적되게 된다. 이러한 과정 속에서 오염토양이 발생하게 되면 수거되어 단순 격리관리하고 있는 실정이지만 앞으로 원전의 해체과정 등으로 인한 오염토양이 상당량 발생할 것으로 예상되기 때문에 적절한 제염을 통하여 폐기물량을 최소화시킬 필요가 있다. 이를 위해 오염토양 제염공정으로 물을 이용한 토양세척법을 선정하여 제염장치를 제작하였으며 실증시험을 수행하였다.(중략)

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2004.06a
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• pp.235-235
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• 2004

밀봉선원 폐기물은 크기가 작지만 특별한 관리 및 처분을 요하는 방사성폐기물이다. 특히 수거된 폐라듐선원의 경우 장기간의 관리가 필요하며, 음식물 보존이나 살균에 사용된 대형 밀봉선원 폐기물의 경우도 처분보다는 재활용도 고려하여야 한다. 이러한 밀봉선원의 특징은 작은 크기와 고건전성물질로 되어 있고 높은 비방사능을 갖는다는 것이며 따라서 처분시 보통의 방사성폐기물과는 달리 비균질폐기물의 특성을 고려한 안전성 평가가 필요하다.(중략)