• Title/Summary/Keyword: 안정화 가능성

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Anaerobic Biological Treatment of Abandoned Metallic Mine Drainages with Limestone and Recycling of Papermill and Livestock Sludge (석회석과 제지·축산슬러지를 재활용한 폐금속광산폐수의 혐기성 처리)

  • Kim, Eun-Ho;Kim, Hyeong-Seok;Sung, Nak-Chang
    • Journal of Korean Society of Environmental Engineers
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    • v.22 no.3
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    • pp.463-473
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    • 2000
  • This research was carried out to investigate chemical pretreatment using limestone in treating abandoned metallic mine drainage with anaerobic biological treatment, and to estimate application of papermill and livestock sludge as carbon sources for SRB (Sulfate Reducing Bacterial. Capacity of anaerobic limestone bed was steeply decreased. But if limestone was utilized as pretreatment process in treating them with anaerobic biological treatment. it could look forward to stabilize system because it did initally neutralize them. Effluent SCOD in R-4 was lower than R-l~R-3 in inital HRT 5day but its concentration was high in HRT 1day after passed time. Therefore in point of durability and supply of organic matter. it seemed that R-4 was useful became organic matter in R-4 was not consumed by excessive degradation within short period. In all reactors, pH was suitable for SRB growth in whole HRT, but on the evidence of ORP, SRB was active after HRT 2day. Fixation trend of heavy meta s showed high as $SO_4{^{2-}}$ reduction efficiency increased, and $SO_4{^{2-}}$ reduction and fixation of heavy metals were relatively high in HET 2day.

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Study on the Combustion Characteristics of a Small-Scale Orimulsion Boiler (소형 오리멀젼 보일러의 연소특성 연구)

  • Kim, Hey-Suk;Shin, Mi-Soo;Jang, Dong-Soon;Choi, Young-Chan;Lee, Jae-Gu
    • Journal of Korean Society of Environmental Engineers
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    • v.27 no.10
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    • pp.1081-1089
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    • 2005
  • In order to examine the application feasibility of Orimulsion fuel in a commercial boiler using heavy fuel oil, a numerical and experimental research efforts have been made especially to figure out the fundamental combustion characteristics of this fuel in a small-scale boiler. One of the notable combustion features of Orimulsion fuel is the delayed appearance of flame location with the flame shape of rather broad distribution, which is found experimentally and confirmed by numerical calculation. This kind of flame characteristics is considered due to the high moisture content included inherently in the process of Orimulsion manufacture together with micro-explosion by the existence of fine water droplets. In order to investigate the effect on the combustion characteristics of Orimulsion, a series of parametric investigation have been made in terms of important design and operational variables such as injected amount of fuel, types of atomization fluid, and phonemenological radiation model employed in the calculation, etc. The delayed feature of peak flame can be alleviated by the adjustment of the flow rate of injected fuel and the generating features of CO, $SO_2$ and NO gases are also evaluated in the boiler. When the steam injection as atomizing fluid is used, the combustion process is stabilized with the reduced region of high flame temperature. In general, the calculation results are physically acceptable and consistent but some refinements of phenomenological models are necessary for the better resolution of pollutant formation. From the results of this small-scale Orimulsion boiler, it is believed that a number of useful information are obtained with the working computer program for the near future application of Orimulsion fuel to a conventional boiler.

Evaluation of Autoheated Thermophilic Aerobic Digestion Process for the Treatment of Pig Manure Wastewater (돈사폐수의 고온 호기성 소화공정 적용 타당성 평가)

  • Chung, Yoon-Jin;Cho, Jong-Bok;Lee, Jin-Yong;Lee, Jong-Hyoung
    • Journal of the Korea Organic Resources Recycling Association
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    • v.3 no.2
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    • pp.103-114
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    • 1995
  • Since autoheated thermophilic aerobic digestion (ATAD) process has various advantages for the treatment of high-strength organic wastewater, active research and field application has been applied in U.S.A. and Canada, recently and the interest in ATAD process has been elevated for treating high-strength organic wastewater efficiently in Korea. Therefore, various experiments were carried out to evaluate the feasibility of ATAD process for the treatment of pig manure wastewater. The results of this study showed possibility to reuse pig manure wastewater as wet fodder or liquid compost, since ATAD process led excellent stabilization on the basis of odor and putrefaction. However. digested sludge can not be provided as wet fodder to most of hog farms without changing dry feeder system into wet system and as liquid compost to hog farms not having their own grass land. Since the results showed that the increase of temperature in reactor was resulted not from energy by biological activity. but from mechanical mixing energy. the reactor investigated in this study was against the principle of ATAD process. Therefore. if pig manure wastewater treated by ATAD can not be utilized as wet fodder. it is not economical to adopt ATAD process only for the treatment of wastewater.

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Development of Video Watermark System for Low-specification System as Android Platforms (저 사양 안드로이드 기반 동영상 보안을 위한 워터마크 시스템 개발)

  • Hwang, Seon-Cheol
    • Journal of the Korea Society of Computer and Information
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    • v.19 no.7
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    • pp.141-149
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    • 2014
  • This paper describes a method to insert and detect watermark or fingerprint to/from videos in low-computing powered system as Android platforms. Fingerprint, which is a kind of watermark, has features such as patterns that contain information. The inserting frame numbers in video-stream and the positions in a picture were chosen from the encrypted user ID to insert the watermarks. The used encrypt algorithm is the HIGHT algorithm which was developed for low-computing powered systems by KISA(Korean Internet & Security Agency). Subtracting an inferred picture from the previous picture was used to extract a candidate feature. Median filtering was used to get rid of noise and stabilize the candidate feature. New algorithm that reduces calculating steps of the median filtering was developed and applied for low-specification systems. The stabilized features were accumulated over 150 times and calculated by correlation coefficient method to recognize the patterns. We examined 22 videos and successfully detected the patterns from 21 videos. The correlation coefficient r values that we examined through this study exceeded over 0.79 more than the threshold (0.7).

An introduction of new time series forecasting model for oil cargo volume (유류화물 항만물동량 예측모형 개발 연구)

  • Kim, Jung-Eun;Oh, Jin-Ho;Woo, Su-Han
    • Journal of Korea Port Economic Association
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    • v.34 no.1
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    • pp.81-98
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    • 2018
  • Port logistics is essential for Korea's economy which heavily rely on international trade. Vast amounts of capital and time are consumed for the operation and development of ports to improve their competitiveness. Therefore, it is important to forecast cargo volume in order to establish the optimum level of construction and development plan. Itemized forecasting is necessary for appropriate port planning, since disaggregate approach is able to provides more realistic solution than aggregate forecasting. We introduce a new time series model which is Two-way Seasonality Multiplied Regressive Model (TSMR) to forecast oil cargo volume, which accounts for a large portion of total cargo volume in Korea. The TSMR model is designed to take into account the characteristics of oil cargo volume which exhibits trends with short and long-term seasonality. To verify the TSMR model, existing forecasting models are also used for a comparison reason. The results shows that the TSMR excels the existing models in terms of forecasting accuracy whereas the TSMR displays weakness in short-term forecasting. In addition, it was shown that the TSMR can be applied to other cargoes that have trends with short- and long-term seasonality through testing applicability of the TSMR.

Creating Electrochemical Sensors Utilizing Ion Transfer Reactions Across Micro-liquid/liquid Interfaces (마이크로-액체/액체 계면에서의 이온 이동 반응을 이용한 전기화학 센서 개발)

  • Kim, Hye Rim;Baek, Seung Hee;Jin, Hye
    • Applied Chemistry for Engineering
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    • v.24 no.5
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    • pp.443-455
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    • 2013
  • Electrochemical studies on charge transfer reactions across the interface between two immiscible electrolyte solutions (ITIES) have greatly attracted researcher's attentions due to their wide applicability in research fields such as ion sensing and biosensing, modeling of biomembranes, pharmacokinetics, phase-transfer catalysis, fuel generation and solar energy conversion. In particular, there have been extensive efforts made on developing sensing platforms for ionic species and biomolecules via gelifying one of the liquid phases to improve mechanical stability in addition to creating microscale interfaces to reduce ohmic loss. In this review, we will mainly discuss on the basic principles, applications and future aspects of various sensing platforms utilizing ion transfer reactions across the ITIES. The ITIES is classified into four types : (i) a conventional liquid/liquid interface, (ii) a micropipette supported liquid/liquid interface, (iii) a single microhole or an array of microholes supported liquid/ liquid interface on a thin polymer film, and (iv) a microhole array liquid/liquid interface on a silicon membrane. Research efforts on developing ion selective sensors for water pollutants as well as biomolecule sensors will be highlighted based on the use of direct and assisted ion transfer reactions across these different ITIES configurations.

An Approach to Identify Single Nucleotide Polymorphisms in the Period Circadian Clock 3 (PER3) Gene and Proposed Functional Associations with Exercise Training in a Thoroughbred Horse (국내산 경주마의 주기성 시계 유전자(PER3) SNP 및 운동에 따른 기능적 식별 접근 가능성 제안)

  • Do, Kyoung-Tag;Cho, Byung-Wook
    • Journal of Life Science
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    • v.25 no.11
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    • pp.1304-1310
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    • 2015
  • The period circadian clock gene 3 (PER3) plays a role in the mammalian circadian clocksystem. A regular exercise regime may affect the PER3 transcription in skeletal muscle. Although the effects of day length on circadian and circannual processes are well established in humans and mice, the influence of exercise on these processes in the horse has not been investigated. The present study investigated the expression of the PER3 gene following exercise in a thoroughbred breed of Korean horse. In addition, a comprehensive in silico nonsynonymous single nucleotide polymorphism (nsSNP) analysis of the horse PER3 gene and predicted effects of nsSNPs on proteins were examined. The expression of PER3 in skeletal muscle was significantly upregulated after exercise. Four nsSNPs were functionally annotated and analyzed by computational prediction. The total free energy and RMSD values of PER3 gene showed causative mutations. The results showed that nsSNP s395916798 (G72R) was associated with residues that have stabilizing effects on structure and function of PER3 gene. This study documented role of PER3 gene in phenotypic adaptation related to exercise in skeletal muscle. Further, the SNPs in PER3 could serve as useful biomarkers of early recovery after exercise in racehorses.

The Applicability of the Acid Mine Drainage Sludge in the Heavy Metal Stabilization in Soils (산성광산배수슬러지의 토양 중금속 안정화 적용 가능성)

  • Kim, Min-Suk;Min, Hyungi;Lee, Byeongjoo;Chang, Sein;Kim, Jeong-Gyu;Koo, Namin;Park, Jeong-Sik;Bak, Gwan-In
    • Korean Journal of Environmental Agriculture
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    • v.33 no.2
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    • pp.78-85
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    • 2014
  • BACKGROUND: Recent studies using various industrial wastes for heavy metal stabilization in soil were conducted in order to find out new alternative amendments. The acid mine drainage sludge(AMDS) contains lots of metal oxides(hydroxides) that may be useful for heavy metal stabilization not only waste water treatment but also soil remediation. The aim of this study was to investigate the applicability of acid mine drainage sludge for heavy metals stabilization in soils METHODS AND RESULTS: Alkali soil contaminated with heavy metals was collected from the agricultural soils affected by the abandoned mine sites nearby. Three different amounts(1%, 3%, 5%) of AMDS were applied into control soil and contaminated soil. For determining the changes in the extractable heavy metals, $CaCl_2$ and Mehlich-3 were applied as chemical assessments for metal stabilization. For biological assessments, lettuce(Lactuca sativa L.) and chinese cabbage(Brassica rapa var. glabra) were cultivated and accumulation of heavy metals on each plant were determined. It was revealed that AMDS reduced heavy metal mobility and bioavailability in soil, which resulted in the decreases in the accumulation of As, Cd, Cu, Pb, and Zn in each plant. CONCLUSION: Though the high level of heavy metal concentrations in AMDS, any considerable increase in the heavy metal availability was not observed with control and contaminated soil. In conclusion, these results indicated that AMDS could be applied to heavy metal contaminated soil as an alternative amendments for reducing heavy metal mobility and bioavailability.

Production of vegetable oil in biomass (바이오매스에서 식물지방 생산)

  • Kim, Hyun Uk;Lee, Kyeong-Ryeol;Kim, Eun-Ha;Roh, Kyung Hee;Kang, Han Chul;Kim, Jong-Bum
    • Journal of Plant Biotechnology
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    • v.41 no.3
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    • pp.107-115
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    • 2014
  • Vegetable oils (triacylglycerols) produced mainly in seeds of plants are used for valuable foods that supply essential fatty acids for humans as well as industrial raw materials and biofuel production. As the demanding for vegetable oils has increased, plant metabolic engineering to produce triacylglycerols in biomass such as leaves has been considered and explored for alternative source of vegetable oils. Leaves are genetically programmed to supply the fixed carbon by photosynthesis to other organs for plant development and growth. Therefore, in order to produce and accumulate triacylglycerols in leaves, one should take account of multiple metabolic pathways such as carbon flux, competition of carbohydrate and fatty acid biosynthesis, and triacylglycerols turnover in leaves. The recent metabolic engineering strategy has showed potential in which the co-expression of three genes WRINKLED1, DGAT1, and OLEOSIN involved in the critical step for increasing the fatty acid synthesis, accumulating triacylglycerols, and protecting triacylglycerols, respectively produced higher amount of vegetable oils in leaves. Developing of genetically engineered plants producing vegetable oil in biomass at non-agricultural lands will be promising to the future success of the field.

Oxidative-Coupling Reaction of Aromatic Compounds by Mn Oxide and Its Application for Contaminated Soil Remediation (망간산화물에 의한 방향족 유기화합물의 산화-공유결합반응 및 이를 이용한 오염토양 정화기법)

  • Kang, Ki-Hoon;Shin, Hyun-Sang;Nam, Kyoung-Phile
    • Journal of Soil and Groundwater Environment
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    • v.12 no.5
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    • pp.115-123
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    • 2007
  • Immobilization of contaminants in subsurface environment is one of the major processes that determine their fate. Especially, immobilization by oxidative-coupling reactions, which is irreversible in the bio-chemical reactions and results in a significant reduction of toxicity, can be successfully applied for the remediation of contaminated soil and groundwater more effectively than conventional degradation. As a catalyst of this oxidative-coupling reaction, manganese oxide has many advantages in practical aspects as compared to microorganisms or oxidoreductive enzymes extracted from microorganisms, fungi, or plants. This paper is to present recent research achievements on the treatment mechanisms of various organic contaminants by manganese oxide. Especially, treatment methods of non-reactive organic compounds to Mn oxide are the main focus; i.e., application of reaction mediator, PAHs treatment method, combination with an appropriate pretreatment such as reduction using $Fe^0$, which suggests the potential of a wide range of engineering application. Concerning the natural carbon cycle processes, immobilization and stabilization by oxidative coupling reaction can be effectively applied as a environmentally-friend remediation method especially for aromatic contaminants which possess a high resistance to degradation.