• 대한한의학회지
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• 제25권1호
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• pp.21-30
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• 2004

Objectives : We aimed to identify the effects of Heechum-san(HCS) On the thrombosis. Methods : We measured the protective effects of HCS on pulmonary thromboembolism induced by collagen and epinephrine, intravascular coagulation induced by dextran. Results : HCS showed a effective inhibition on coagulation of platelets induced by ADP or epinephrine. HCS showed survival rate of 14.28% on pulmonary thrombo- embolism caused by collagen and epinephrine. On the measure of the blood flow rate induced by the thrombus, in vivo HCS accelerated the blood flow rate. Conclusions : HCS has antithrombotic effects.

• Applied Biological Chemistry
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• 제35권2호
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• pp.69-75
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• 1992

우유 단백질이 산에 의해 일어나는 응고의 시점과 응고가 일어나는 속도를 점도 변화와 혼탁도 변화로서 각각 측정하였고, 산성화의 변화에 따라 나타나는 입자의 크기는 상대점도로서 비교하였다. 우유 단백질의 응고화는 $pH\;5.0{\sim}5.2$에서 일어났음을 급격한 점도 변화에서 알 수 있고 산성화시키는 온도에 따라서 그 정도가 변하였다. 산에 의해 응고가 시작되는 pH와 응고속도는 온도가 증가함에 따라서 또 예열 처리하였을 때 촉진되었고 염의 첨가시에는 감소한 반면, 상대 점도값은 같은 조건들 하에서 반대였다. 이는 산성화 온도를 증가할수록, 등전점의 pH에서, 또 우유를 예열했을 때 입자가 커지는 것을 나타내며, 생성되는 입자의 크기는 응고속도와 밀접한 관계가 있는 것을 알 수 있다.

• 한국수산과학회지
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• 제36권6호
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• pp.716-722
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• 2003

This study determined the optimum dosage for coagulation reactions of red tide organisms (RTO) using a combination of ignited oyster shell powder (10sp) and loess and examined the electrokinetic and rheological characteristics of their flocs. Two kinds of RTO, Cylindrotheca closterium and Skeletonema costatum, were sampled in Masan Bay and cultured in the laboratory. Coagulation experiments were conducted using various concentrations of IOSP, loess, IOSP+1oess, RTO, and a jar tester RTO cell numbers were counted for both the supernatant and RTO culture solution. The removal rates increased rapidly with increasing IOSP concentrations up to 50 mg/L and loess concentrations up to 800 mg/L. A removal rate of $100\%$ was reached at 400 mg/L of IOSP and 6,400 mg/L of loess. The highest increment $(16.7\%)$ of the rates of coagulation reaction occurred using both IOSP and loess (50+200 mg/L) in comparison with IOSP alone. The rate of coagulation reaction using both IOSP and loess (50+200 mg/L), $90.6\%,$ was similar to employing either IOSP of 150 mg/L or loess of 3,200 mg/L. All of the coagulation liquids for RTO, IOSP (200 mg/L), loess (200 ma/L), and IOSP+1oess (200+200 mg/L) revealed non-Newtonian fluid properties and therefore their shear rate vs. shear stress curves were non-linear. The coagulation liquids revealed elastic body properties at a lower shear rate increasing in the following order: RTO, IOSP (200 mg/L), loess (200 mg/L), and IOSP+1oess (200+200 mg/L. IOSP+1oess (200+200 mg/L) especially demonstrated plastic flow properties at a lower shear rate.

• 상하수도학회지
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• 제23권4호
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• pp.459-469
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• 2009

It is well known that coagulation pretreatment can reduce foulants prior to membrane filtration. The purpose of this research was to investigate the effects of coagulation on fouling of ceramic microfiltration membrane($0.1 {\mu}m$) using pilot plant of $150m^3/day/train$ capacity. Train A membrane system has pretreatment process of ozonation and coagulation while train B has only coagulation. Two types of coagulation operation were investigated: back mixer(rapid mixing with or without slow mixing) which is a conventional mechanically stirred mixer and an inline static mixer. Ozone dose rate for train A was 1 mg/L and ozone contact time was 12 min. The coagulation dose(PACl 10% as $Al_2O_3$) rate was changed 20~40 mg/L according to experimental schedule. In this experimental conditions, the coagulation of back mixer type with rapid mixing(GT=72,000) and slow mixing(GT=45,000) was the best effective in reduction of ceramic membrane fouling regardless preozonation. Especially, the effect of inline static mixer was sensitive to change in water quality. Ozonation mainly affected irreversible fouling rather than reversible fouling in accordance with less adsorption of NOM on the membrane surface. Thus, the increase rate of the nomalized TMP(trans membrane pressure) at $25^{\circ}C$ for train A was relatively lower than that of train B under same coagulation process with same coagulant dosage. The best performance of ceramic membrane appeared in case of combined process with ozonation, therefore this integrated process is able to archive less coagulant dosing and secure a stability of ceramic membrane system.

• Agricultural and Biosystems Engineering
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• 제6권2호
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• pp.77-82
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• 2005

The fractionation of green juice could be one of the ways to treat the green juice for saving the bio re-sources by using the basic processes of protein coagulation and separating juice coagulation into protein paste and brown juice and storing the final products. The fractionation of Chinese cabbage juice can be accomplished by applying the combine method of the formic acid with rate of 0.3% and the propionic acid with rate of 0.1 % added 4 hours later in the juice with maximum recovery of protein coagulation. The separation of coagulation into the protein paste and the brown juice completed in 6.5 hours by set up method in a special designed storage. The protein paste could be stored safely for 30days in anaerobic condition.

• 대한의용생체공학회:의공학회지
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• 제35권3호
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• pp.62-67
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• 2014

The purpose of the study was to identify the effect of laser parameters on photocoagulation to maximize safety and efficacy during varicose vein treatment. CW and pulsed modes at 1470 nm were initially compared as a function of power on bovine liver tissue. In the pulsed mode, various parameters including repetition rate, duty cycle, and irradiation time were compared to evaluate tissue response during thermal treatment. The results demonstrated that CW and pulsed modes yielded almost similar coagulation development possibly due to shorter irradiation time of 5 sec. Regardless of laser mode, both repetition rate and duty cycle presented constant coagulation rate whereas longer irradiation time facilitated coagulation process.

• 한국물환경학회지
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• 제31권2호
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• pp.94-102
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• 2015

Electro-coagulation experiments were conducted with aluminum (Al) or iron (Fe) electrode in order to determine the optimal electrode material and operation conditions for algae removal. Al electrode showed higher removal rate of algae than Fe electrode because Al flocs have positive surface charges which electrostatically attract algae species having negative surface charges. Removal rate of algae and total phosphorous (T-P) was increased as current density and electrode area increases. It was also found that initial pH with neutral range was optimum for T-P removal by electro-coagulation. Bench-scale continuous flow experiments consisted of electro-coagulation reactor, agitation tank and settling tank were conducted. In electro-coagulation reactor, a large fraction of Al flocs were distributed to scum layer, due to the gas bubbles generated by electrolysis reaction. In agitation tank, most of Al flocs were settled and the optimal mixing intensity was found to be 50 rpm to achieve good settleability. The removal rate of algae was about 90-95%. Additionally, the removal rate of the T-P and COD was observed to be $73.8{\pm}8.0%$ and $75.0{\pm}3.8%$, respectively. Meanwhile, the removal rate of total nitrogen (T-N) was relatively low at only 24%.

• 한국식품과학회지
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• 제24권1호
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• pp.42-48
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• 1992

0.1N HCl 이용하여 빠른 산성화를 시켰을 때에 우유의 응고속도와 그 정도는 온도와 pH에 따른 점도 변화와 혼탁도 변화로서 측정하였고, DGL을 이용하여 천천히 산성화 시켰을 때에 우유의 겔화 과정은 rheological scanner로서 측정하였다. 우유의 겔화 과정은 rheological scanner로서 측정하였다. 우유 casein의 응고는 pH 5.0에서의 돌연한 점도증가로서 나타났으며 산에 의한 응고형성의 기점 pH로 삼았다. 산에 의한 응고속도는 $20^{\circ}C$에서 $50^{\circ}C$로 온도가 높아질수록 빨라졌고 최대 응고속도는 pH5.0에서 일어났다. 염($CaCl_{2}$)의 첨가는 모든 온도범위에서 최대 응고속도를 감소시켰으며 응고가 시작되는 pH 및 최대 응고속도가 일어나는 pH를 변화시켰다. 천천히 산성화 동안에 생성되는 겔의 초기 형성 시간과 조직 형성속도는 Cl 이온에 의해 촉진되고 SCN 이온에 의해 억제되었다. 겔에서 생겨나는 syneresis 현상은 저온으로 갈수록, pH가 4.6에 접근할수록 심했으며, $90^{\circ}C$에서 5분 동안 열처리한 우유에서는 가열온도($60{\sim}90^{\circ}C$)에 상관없이 일정하게 나타났다.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 2000년도 THE THIRD INTERNATIONAL CONFERENCE ON AGRICULTURAL MACHINERY ENGINEERING. V.III
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• pp.792-802
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• 2000

The coagulation of Chinese cabbage juice can be accomplished by applying the combine method of the formic acid with rate of 3% and in four hours the propionic acid with rate of 1 % in the juice. The separation of coagulation into the protein paste and the brown juice completed in 6.5 hours by set up method in special storage. The protein paste can be stored safely for 30 days in anaerobic condition.

• Environmental Engineering Research
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• 제23권2호
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• pp.159-163
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• 2018

The feasibility of applying coagulation-integrated microfiltration (MF) as a pretreatment for an ultrafiltration (UF) feed in oily wastewater treatment was investigated. The effects of different coagulants on oil removal rates from wastewater were studied. The maximum oil removal rate of 82% was obtained after coagulation with 130 mg/L of polyaluminium chloride (PAC). UF flux reached $95L/(m^2{\cdot}h)$ with coagulation-integrated MF as pretreatment. This value was 2.5 times higher than that flux obtained without pretreatment. The value of UF flux increased as the transmembrane pressure (TMP) and cross-flow velocity (CFV) of the UF module increased. UF flux gradually increased when TMP and CFV exceeded 0.4 MPa and 3 m/s, respectively, because of concentration polarization and membrane fouling stabilization. Chemical oxygen demand reduction and oil removal rate reached 95.2% and 98.5%, respectively, during integrated membrane processing with a PAC concentration of 130 mg/L, TMP of 0.4 MPa, and CFV of 3 m/s for UF. In addition, sequentially cleaning the fouling membrane with NaOH and $HNO_3$ aqueous solutions caused UF flux to recover to 90%. These encouraging results suggested that the hybrid integrated membrane process-based coagulation and MF + UF are effective approaches for oily wastewater treatment.