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      • RFID와 얼굴인식을 이용한 위해물 관리에 관한 연구

        추정호,이재용,강대성 東亞大學校 附設 環境問題硏究所 2007 硏究報告 Vol.29 No.1

        It prevents the problem beforehand such as second infection by an illegal disposal of the waste which is harmful for people, can solve the real problem caused by management and disposal of the waste, using the RFID that is kernel technology of the next generation in this paper. At first, it is possible to prevent managers' impure intention beforehand, using the authentication card that is storing managers' bio-information who is managing the hazard material. Also it suggests efficient solution that can offer better environment that previous managers' working environment, applying the RFID system to every stage, from the first point of the occurrence time of the waste modeled on general material distribution process to the final processing stage.

      • 3,7-Dihydroxy-3,7-dioxoperhydro-1,5,3,7-diazadiphosphocine-1,5-diacetic acid 유도체의 합성과 구조분석

        정대일,이도훈 東亞大學校 附設 環境問題硏究所 2007 硏究報告 Vol.29 No.1

        In the last few tears, great efforts have been devoted to the development of efficient ligands for transition metal ions, in order to obtain complexes whose stability, physical properties and biodistribution could make them suitable for application as contrast agents for magnetic resonance imaging(MRI), diagnostic- therapeutic radiopharmaceuticals, or f1uorescent bioassays To the best of our knowledge, there are few reports involving the reation of hypophosphorous acid with formaldehyde and primary amines. Our interest in α-aminoalkylphosphinic and bis(α-aminoalky) phosphinic acids lies in their coordination ability towards metal ions, thereby providing useful structure motifs for the preparation of multi-sited ligands. πle reaction was then perfOI1Tl<:화 adopting glycine, aspartic acid, or glutamic acid as a model arninoacid in aq. HCl. The heterαyclic ligand synthesised by glycine is 3,7-dihydroxy-3,7-dioxoperhy dro-l,5,3,7-diazadiphosphocine-l,5-diacetic acid, and product synthesized by Lglutamic acid is 2- [5-(1,3-Di-carboxypropy])-3,7-dihydroxy-3,7-dioxo-315,715-[1,5,3,7l d경adiphosphocan-l-yll-pentan어ioic acid. Synthesis of acid compound by trearment of L -aspartic acid is in progress.

      • 재생골재를 콘크리트용 골재로 사용하기 위한 기초 물성 연구

        공경록,강헌찬 東亞大學校 附設 環境問題硏究所 2004 硏究報告 Vol.26 No.-

        This study research the method that it will be able to increase the demand of the quality of the construction waste and recycled aggregate. It includes a test for sieve analysis of aggregate, a test for specific gravity, a test for absorption, a test for impurity contents and crisis effect of cement paste of recycled aggregate. The grain size change of the 13~45mm recycled aggregate by the crusher when moving toward the 2nd cone crusher from the 2nd jaw crusher, the content change from 6.69% changed with 55.34%. The recycled aggregate of 13~45mm includes a standard grain size distribution. A test of impurity contents was resulted 1.49%. Density of the recycled aggregate of 13~45mm was 2.14g/㎤ and water absorption ratio was 7.74%. Content of the aggregate where the cement paste sticks below 50% changed 8.35% → 12.68% → 13.76% → 23.61% → 23.67% when first jaw crusher → second jaw crusher → first cone crusher → double screen → recycled aggregate of 13~45mm. The crisis of the recording aggregate which will be rough the crusher and the cement paste goes well. For the recycled aggregate production of quality the development of the system which separates the recycled aggregate is necessary.

      • 액-액 추출에 의한 Acetonitrile 회수

        박상일,옥동석,박동원 東亞大學校 附設 環境問題硏究所 2007 硏究報告 Vol.29 No.1

        Due to the rising cost of energy, new separation process based on extraction is becoming more attractive than before. Thus, the need for calculating and preclicting liquid-liquid equilibrium (LLE) has very much increased. The separation of mixture that has similarly boiling point, forms azeotropic mixture and has higher boiling point, is impossible to separate by distillation. Thus, this case sometimes used extraction. In process of manufacturing acrylonitrile, azotrope of acetonitrile-water was came into being as by-product. For the purpose of recovering acetonitrile through solvent extraction process, o-xylene, methyl iso- butyl ketone, ethyl acetate, and l-butanol as solvents were selected in order to separate acetonitrile from azotrope of acetonitrile-water. In this study, liquid-liquid equilibrium data were determined and consistency of the experimental data was investigated. Binodal curve, tie-line, distribution and selectivity for each ternary, quatemary system have been determined in order to investigate the effect of using single and binary solvent in extracting acetonitrile from aqueous solution.

      • Calcium oxalate의 합성과 정량분석

        이미정,이연희,이현옥,정석현,송주현,정대일 東亞大學校 附設 環境問題硏究所 2004 硏究報告 Vol.26 No.-

        We report synthesis and quantitative analysis of calcium oxalate. Synthesis of calcium oxalate by treatment of oxalic acid with Ca(OH)_(2) and oxalic acid with CaCl_(2) was executed. quantitative analysis of Ca for bean sprouts, spinach, coffee, and brown seaweed was analyzed by ICP(Inductively Coupled plasma). We experienced reaction and formation of crystal for oxalic acid and CaCl_(2) with NaCl, KCl, FeCl_(3) or AlCl_(3).

      • 통영시와 양산시의 강우시 합류식 하수관거 월류수(CSOs)에 관한 비교연구

        김한석,정병길,정유진,박광현,성낙창 東亞大學校 附設 環境問題硏究所 2004 硏究報告 Vol.26 No.-

        The Objective of this study was conducted to investigate the comparison of combined sewer overflows(CSOs) characteristics for rainy season in Tongyoung and Yangsan city. Two sites for the analysis of CSOs were chosen each in the city of Tongyoung, a coastal area, and in the city of Yangsan, an inland area. The analysis of water quantity on CSOs was conducted with Flo-Tote(Ⅱ) and SIGMA 920. For analysis parameters, BOD_(5), COD_(Cг), TSS, T-P, and T-N were analyzed 12 times in a day. In case of Tongyoung, the pollution load of TSS was noticeable since its large permeability coefficient created by unpaved roads and these results caused in the large inflow of earth and sand or solid materials into combined sewers in the event of precipitation.

      • 음식물폐수의 화학적 응집

        김정섭,박승조,박정훈 東亞大學校 附設 環境問題硏究所 2007 硏究報告 Vol.29 No.1

        Removal of chemical oxygen demand (COD) was 6.1, 6.5, 6.6%, total suspended solid (TSS) was 68.9, 74.1, 61.1% and sodium chloride (NaCl) was 29.5, 29,1, 31,1%, respectively when we added with 100 mg/L of aluminum sulfate in the food wastewater controlled pH 4, 7, 9 and react for 4 hours, As a results of coagulation efficiency of food wastewater added with the aluminium sulfate, aluminium sulfate was excellent as a coagulant.

      • 다양한 생물학적 하수처리공정에서의 다환방향족탄화수소류(PAHs)의 제거특성

        정진희,이지현,노지희,김한석,최호은,박출재,정병길 東亞大學校 附設 環境問題硏究所 2008 硏究報告 Vol.29 No.1

        Polycyclic aromatic hydrocarbons (PAHs) can be formed both natural and anthropogenic processes. Both sources are contributors of hazardous compounds, but anthropogenic sources are considerably more damaging to the environment. The purpose of this research obtains a primary data base to treat PAHs-contaminated sewage sludge effectively and properly by figuring out concentrations and origins of PAHs which load in influent of sewage treatment plant. During the experiment period from April 2007 to June 2007, concentrations of PAHs in influent, effluent and dewatered cake at 5 different sewage treatments at City were analysed by using a gas chromatography/mass spectrometer(GC/MS). The volume of samples from influent and effluent was 2 liters. The weight of sample from the dewatered cake was 500g. Ranges of concentrations of PAHs in influent, effluent and dewatered cake were 72.3-83.9 μg/L, 1.1 -6.8 μg/L and 2,669.6-3,491.5 μg/kg respectively. The most abundant compounds of PAHs were fluorene and phenanthrene for all sewage treatment plants. The ratios have been used extensively to distinguish petrogenic or pyrogenic sources of PAHs in the dewatered cake at 5 different sewage treatment plants. It was not easy to di stinguish between petrogenic and pyrogenic sources of PAHs because the PAHs contained both characteristics. 본 연구에서는 하수처리장으로 유입되는 PAHs 의 배출 원을 파악하여 생물학적 처리에 의해 처분되는 하수 슬러지의 경로별 유입 PAHs 의 배출량 및 농도을 추정한 결과 다음과 같은 결론을 얻을 수 있었다. 1. 하수처리장 유입수, 방류수 및 탈수케잌 의 PAHs 농도는 각각 72.3~83.9 μg/L,1.1~6.8 μg/L, 2,669.6 ~ 3,491.5 μg/kg 의 범위를 나타내 었다. 2. 유입수와 탈수케잌 의 경우 모든 하수처리장에서 PAHs 중 각각 fluorene과 phenanthrene 이 가장 높은 농도를 나타내었으며,공장폐수가 유입되는 하수처리장의 경우 벤젠고리 5 - 6개의 고비점 화합물들이 가정하수가 유입되는 하수처리장 에 비하여 다소 높게 나타났다. 3. 모든 하수처리장에서 PAHs 중 저분자량의 LPAHs 제거효율은 85.0% 이상을 나타내었으며,이는 활성슬러지법을 이용한 미생물에 의한 분해로 판단된다. 그러나 고분자량의 HPAHs 제거효율은 활성슬러지법만으로는 67.3% 정도로 낮아 2차 처리가 필요할 것으로 판단된다.

      • 하수슬러지 소각재와 규산나트륨의 혼합비율에 따른 인공경량골재 제조특성 평가

        박재홍,정병길,최호은,노기현,최병혁,성낙창 東亞大學校 附設 環境問題硏究所 2007 硏究報告 Vol.29 No.1

        The objectives of this study have been carried out to investigate the manufacture characteristics of artificial lightweight aggregate using sludge ash by bulk density, water absorption rate, compressive strength measure and SEM photograph, and the environmental risk assessment of artificial lightweight aggregate by leaching test of heavy metals for sludge recycling. The sludge ash used in this study was collected from K wastewater treatment plant in Busan, and incinerated in A company’ s incinerator and m비ngs여ium s피cate. we intended to estimate the manufacture characteristics of artificial lightweight aggregate v.밍ying operation pressures(O.5, 1, 2, 3, 4 ton) and addition amount of s여ium silicate(O, 10, 20, 30 %)Results showed that the artificial lightweight aggregate samples of SA-O(above 3 ton), SA-l(above 2 ton) and SA-2, SA-3{above 1 ton) were standardized about bulk density, absorption rate and compressive strength. And adding s여ium silicate was found to be effective than wastewater sludge ash alone. The results of the heavy metals leaching test met the standards of the Korea Standard Leaching Test{KSL T). These results were showed that the manufacture of artificial lightweight aggregate using wastewater sludge ash have the possibility for resource recycling

      • 외기조건변화에 따른 전열교환 환기시스템의 성능평가 및 운전방안에 관한 연구

        이정재,김 광 현,박 미 지 東亞大學校 附設 環境問題硏究所 2007 硏究報告 Vol.29 No.1

        Recently, it has been revising regulation of ventilator installation and detail regulation the secures comfortable & safety indoor air quality(IAQ) and obligated establishment of heat recovery ventilator in new apartment building. In this study, we offers operation and a plan of heat recovery ventilator to energy saving by measure efficiency the come out from outdoor conditions and comparing & analysis the energy saving effect. As a result of in this study was as follows : In case, we think that if it do not show that the upper than average of 30 percents absolute humidity in spring and autumn, it should profitably operation "by-pass mode". (2) Energy saving effect appears the heat recovery ventilator show widely rate ratio compared to constant air volume system.

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