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Poly ( Itaconic acid ) grafted - chitosan copolymer 의 제조와 응집에 의한 COD 및 중금속의 제거 능력
윤충수(Choong Soo Yun),한상문(Sang Mun Han),김용범(Yong Beom Kim) 한국키틴키토산학회 1999 한국키틴키토산학회지 Vol.4 No.3
N/A Chitosan was prepared from chitin which was abstracted from wasted crab shells. Then itaconic acid was graft-copolymerized onto chitosan using ceric ammonium nitrate as a reaction initiator. To investigate the optimal grafting conditions, the influences of several factors on the grafting were studied i.e. the concentrations of Ceric Ammonium Nitrate(CAN) and itaconic acid, the reaction temperature and time. And to find out its flocculation ability, the flocculation test was carried out with a metal plating factory waste water. The state of graft-copolymer was identified through IR spectra analysis. The optimal grafting conditions and flocculation results were shown to be : concentration of ceric ammonium nitrate is 3.5×10-3M, reaction temperature is 40℃ and reaction time is 4 hrs with 0.25 M of the monomer(itaconic acid). Though flocculation tests using chitosan, grafted chitosan and cation, CODcr, metal ions removal rates were measured. The order of superiority is Itaconic acid grafted chitosan>Chitosan>Cationic polymer.
Intracochlear Fluid Pressure and Cochlear Input Impedance from Push-pull Amplification Model
윤용진,백종대,신충수,이주현 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
Intracochlear fluid pressure and cochlear input impedance are simulated and compared with in-vivo physiological measurements. The objective of this work is to compare the calculations and measurements for the cochlear fluid pressure (PST) and related cochlear input impedance (ZC) with “push-pull” active cochlear model involving cochlear cytoarchitecture. Presented three-dimensional cochlear hydro-dynamic model is developed by implementing an active “push-pull” cochlear amplifier mechanism based on Y-shaped organ of Corti cytoarchitecture and using the time-averaged Lagrangian method. For the gerbil PST magnitude, the model results shows (i) the nonlinearity with 10 dB gain, (ii) the 2/3 octave shift in the active case, and (iii) the presence of peaks and valleys which are observed in gerbil in vivo measurement. Additionally, simulation results of chinchilla and cat cochlear |ZC| reflect overall trend of animal measurements, while the gerbil and human cochlear |ZC| are 10 dB lower (> 2 kHz) and 7 dB lower (< 2 kHz) than the measurements respectively.
키토산에 대한 Itaconic acid의 graft 공중합과 그 특성
한상문,윤충수,김용범 서울산업대학교 산업대학원 1999 大學院論文集 Vol.6 No.-
Chitosan was prepared from chitin which was abstracted from wasted crab shell. Then itaconic acid was graft-copolymerized onto chitosan using ceric ammonium nitrate(CAN) as a reaction initiator. To investigate the optimal grafting conditions, the influences of several factors on the grafting were studied, i.e., the concentrations of CAN and itaconic acid, the reaction temperature and time. And to find out its flocculation ability, the flocculation test was carried out with a metal plating factory waste water. The state of the graft-copolymer was identified through IR spectra checking. The optimal grafting conditions and flocculation results were shown to be: concentration of ceric ammonium nitrate is ??, reaction temperature is 40℃ and reaction time is 4hrs with 0.25M of the monomer(itaconic acid). Through flocculation tests using chitosan, grafted chitosan(CsIa) and cation, CODcr, metal ions removal rates were measured. The order of superiority is CsIa>Cs>Cation.
게 껍질 폐기물로부터 추출한 Chitosan에 Itaconic acid의 그라프트 공중합과 오염물질의 제거 능력
한상문,윤충수,김용범,Han, Sang-Mun,Yun, Chong-Soo,Kim, Yong-Beom 유기성자원학회 1999 유기물자원화 Vol.7 No.2
수산물 가공 공장에서 배출되는 게 껍질 폐기물로부터 Chitin을 추출하고 탈아세틸화하여 Chitosan(Cs)을 제조하였다. 이 Cs를 초산 용액중에서 용해한 후 Itaconic acid를 첨가하고 Ceric ammonium nitrate(CAN)를 반응 개시제로 사용하여 Graft-copolymerization 하였다. 본 연구에서는 Cs에 첨가하는 Itaconic acid와 CAN의 농도, 반응온도, 반응시간의 영향에 따른 최적 중합 조건을 도출하고 이 Grafted-copolymer-의 폐수중의 CODcr 유발물과 구리 이온의 제거 능력을 연구하였다. 여기서 CODcr과 구리이온의 제거능력시험에 사용한 폐수는 도광 공장 폐수를 사용하였고, Graft-copolymerization으로 합성된 이 중합체의 동정에는 적외선 스펙트로메타를 사용하였다. 이상의 실험 결과 Graft율은 Cs에 Monomer로써 Itaconic acid를 0.25M농도로 첨가하였을 때, CAN은 $3.5{\times}10^3M$, 반응 온도는 $40^{\circ}C$ 그리고 반응시간은 4시간일때 가장 높았다. 또한, Cs과 Itaconic acid grafted chitosan(CsIa), Cationic polymer를 사용하여 폐수중 유기물과 금속이온의 제거 실험을 한 결과 상등액의 CODcr과 구리 이온 제거율은 Cs와 Cationic polymer 보다CsIa가 보다 효과적이었다. 이것은 합성한 CsIa가 양쪽성 고분자이기 때문이다. Chitosan was prepared from chitin which was abstracted from wasted crab shells. Then itaconic acid was graft-copolymerized onto chitosan using ceric ammonium nitrate as a reaction initiator. To investigate the optimal grafting conditions, the influences of several factors on the grafting were studied, i. e., the concentrations of CAN and itaconic acid, the reaction temperature and time. And to find out its flocculation ability. the flocculation test was carried out with a metal plating factory waste water. The state of graft-copolymer was identified through IR spectra analysis. The optimal grafting conditions and flocculation results were shown to be : concentration of ceric ammonium nitrate is $3.5{\times}10^3M$, reaction temperature is $40^{\circ}C$ and reaction time is 4hrs with 0.25M of the monomer(itaconic acid). Though flocculation tests using chitosan, grafted chitosan and cation, CODcr. metal ions removal rates were measured. The order of superiority is Itaconic acid grafted chitosan>Chitosan>Cationic polymer.
Detection of Thiocholine Ions with Cobalt Phthalocyanine Mediated Screen Printed Electrode
Jie-Kai Er,윤용진,Sum Huan Ng,King Ho Holden Li,신충수,Pei-Chen Su,Nam Beng Tay,Wei Wang 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
Acetylcholine (ACh) is a neurotransmitter that is responsible for many of our bodily functions while acetylcholineesterase (AChE) isits enzyme. Certain nerve agents inhibit AChE to cause malfunctions of our body system. To detect those agents, the concentrationof AChE by-product, choline, is used as a detection marker. Using a screen printed electrode and acetylthiocholine (ATCh) as areplacement for ACh, amperometry is employed to detect the concentration of the AChE-ATCh reaction by-product, thiocholine. Results showed that 0.1 V is the optimum potential for thiocholine detection. Voltages of 0.2 V and 0.3 V also produced similar currentmagnitudes. From 0.225 mM to 0.9 mM of thiocholine, the amperometry current exhibits a linear relation with concentration. Thesensitivity electrode is around 2.53 μA/mM. A flow rate of 100 μL/min is chosen as it is close to the saturation oxidation rate of theelectrode and is useful in practical situations. Taking into account the errors met at 0.1 V, the sensitivity of the system is calculatedto a minimum of 0.04 mM.
Yoonno Gregory Hong,신충수,윤용진,김판권 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.15 No.10
Anterior cruciate ligament (ACL) injury often occurs among athletes during single-leg landing. Wearing shoes could alter lowerextremity kinematics and kinetics and affect the risk of ACL injury. This study aimed to investigate knee and ankle kinematics andkinetics during single-leg landing in shod and barefoot conditions. Nineteen males performed single-leg landings by stepping off a0.3-meter platform in shod and barefoot conditions. Three-dimensional lower limb kinetics and kinematics were calculated using aforce plate and motion analysis system. The present study found that the peak knee valgus moment (p=0.024), peak anterior tibialtranslation (ATT) (p=0.022), and peak knee flexion angle (p<0.01) are greater during shod landing. In addition, the peak ankleinversion (p<0.01), peak eversion moment (p=0.032), and peak eversion angular velocity (p<0.01) were higher during shod landing. In conclusion, the increased knee valgus moment and ankle eversion moment suggest that shod conditions increase the risk of ACLinjury; however, higher ATT and knee flexion angle during shod landing were not associated with increased risk of ACL injury. Further, the higher ankle movement in the coronal plane during shod conditions appears to increase the risk of ankle injury.