• 한국전기전자재료학회논문지
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• 제29권5호
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• pp.298-302
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• 2016

In this work, $LiMn_2O_4$ and $LiNi_{1/3}Mn_{1/3}Co_{1/3}O_2$ cathode materials are mixed by some specific ratios to enhance the practical capacity, energy density and cycle performance of battery. At present, the most used cathode material in lithium ion batteries for EVs is spinel structure-type $LiMn_2O_4$. $LiMn_2O_4$ has advantages of high average voltage, excellent safety, environmental friendliness, and low cost. However, due to the low rechargeable capacity (120 mAh/g), it can not meet the requirement of high energy density for the EVs, resulting in limiting its development. The battery of $LiMn_2O_4-LiNi_{1/3}Mn_{1/3}Co_{1/3}O_2$ (50:50 wt%) mixed cathode delivers a energy density of 483.5 mWh/g at a current rate of 1.0 C. The accumulated capacity from $1^{st}$ to 150th cycles was 18.1 Ah/g when the battery is cycled at a current rate of 1.0 C in voltage range of 3.2~4.3 V.

• 한국전기전자재료학회논문지
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• 제26권5호
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• pp.380-384
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• 2013

In this paper, we have developed a low temperature process to make two type of paste by using $TiO_2$ nanoparticles(P25). The interconnections between substrate and $TiO_2$ films or link between particles of free-binder paste(FP1, FP2, FP3) is very poor. Therefore, the Titanium(IV) isopropoxide was added to the TP paste to improve the interconnection. Electron transport time (${\tau}_t$) and recombination time (${\tau}_r$) are analyzed by IMPS (intensity-modulated photocurrent spectroscopy) and IMVS(Intensity-modulated photovoltage spectroscopy). In the results, ${\tau}_t$ of TP paste based DSSCs (about $4.3{\times}10^{-3}$) is faster than other samples. ${\tau}_r$ is longer from $2.7{\times}10^{-2}$ s of FP2 to $3.0{\times}10^{-2}$ s of TP. A solar conversion efficiency (DSSCs) of TP is 3.54% for an incident solar energy of 100 mW $cm^{-2}$(meanwhile, 2.70% for DSSCs with FP2). The conversion efficiency is increased by 1.3 times.

• 대한한의학방제학회지
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• 제12권1호
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• pp.105-121
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• 2004

This report describes the studies as follows through the research into the data of Fructus Forsythiae main blended prescriptions from Dongeuybogam. Through investigation on prescriptions from Dongeuybogam with Fructus Forsythiae as an ingredient, the following conclusions were reached. 1. All kinds of infection in a boil and the malignant tumor recorded the largest number of clinical frequency of the prescriptions in therapeutic use when Fructus Forsythiae was taken as a principle medicine. 2. The prescriptions are compounded with Fructus Forsythiae as a principle medicine can apply to eye disease, nose and ear disease, throat disease, trauma, the malignant tumor, skin disease, dental disease and heat pathogenic disease. 3. Various pathogenic factors such as wind-heat, heat, fire, wind, qi, poison, cold are put to practical use. 4. The dosage of Fructus Forsythiae is 2bun(about 0.75 gram) to 3jeon(about 11.25 gram), however 1joen(about 3.75 gram) has been taken the most for clinical application. 5. With examination the formulae of presciptions containing Fructus Forsythiae, I found the basic prescriptions as well as the medicines are in conjunction with Fructus Forsythiae and the theoretic grounds of formula in combining Fructus Forsythiae as a group of medicine for prescription through this research.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2001년도 추계학술대회 논문집 Vol.14 No.1
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• pp.545-549
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• 2001

We have produced electrolyte solution out of 1.15M $LiPF_6$ EC/EMC/DEC/PC(30/55/10/5 by vol%) as a reference, and at the same time, performed basic physical property test using a single solvent of 1.15M $LiPF_6$ DEC, DMC, EMC and a 2 component electrolyte solution of 1.15M $LiPF_6$ EC/DEC(1/2 by vol%) and PC/DEC(1/2 by vol%). Cyclic Voltammetry Analysis showed that, compared to existing carbonate organic solvent, the addition of DEC,DMC and EMC brought the de-decomposition peak of salt anion of $PF_6$ and the solvent at lower oxidization potential of 2.3V, 0.7V and 2.1V(vs. $Li/Li^+$). In addition, a kinetics current peak, in which intercalation of Lt is proceeded at 750mV, 450mV(vs. $Li/Li^+$), was confirmed. These findings suggest that the DEC solvent decomposition occurred at an electric potential lower than that of oxidization of existing carbonate organic solvent. Through the impedance analysis, we checked electric charge transfer resistance($R_{ct}$) according to the electric potential of $Li^+$ intercalation at 750mV(vs. $Li/Li^+$), which was the same as the resistance ($R_f$) and cyclic voltammetry of SEI film that was formed at Reference. By doing so, we found that the significant decrease of polarization resistance($R_p$) when Reference was played a part in the formation of compact SEI layer at the initial decomposition reaction.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 추계학술대회 논문집 Vol.15
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• pp.542-545
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• 2002

High performance organic electroluminescnet(EL) devices which are composed of organic thin multilayer films are fabricated. The basic structure is ITO/Emitting layer/LiF/Al in which have a blended emitting layer. The emitting layer is consisted of a host material(N,N' diphenyl-N,N' (3-methyl phenyl)-l,l'-biphenyl-4,4'diamine)(TPD)) and a guest emitting material(poly(3-hexylthiophehe)(P3HT)). We think that the energy transfer in blending layer occurred from TPD to P3HT. Red emitting multilayer EL devices were fabricated using tris(8-hydroxyqunolinate) aluminum$(Alq_3)$ as electron transport material. The device structure of ITO/blending layer(TPD+P3HT)$/Alq_3$/LiF/Al was employed. In the Voltage-current-luminance characteristics of multilayer device, the device tum on at the 2V and the luminance of $10{\mu}W/cm^2$ obtain at l0V. Red emission peak at 640nm was observed with this device structure. We have presented evidence that the excitation energy migration between a polymeric host and guest has to be explained. And by using multilayer, the red light emitting EL device enhances not only Voltage-current-luminance characteristic but also stability of device.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 추계학술대회 논문집 Vol.15
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• pp.596-602
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• 2002

An easy elevator for learning originated is opened to compare the existed learning equipment, and it had a high studying efficient that the sequence control circuit can opens and closes with the wire. The structure of equipment to be controlled from the first floor to the fifth floors is demonstrated a constructive apparatus by a lamp atc to express the function of the open-close of the door according to the cage moving with a mechanical actuation of the forward-reverse breaker and the motor of load and a mechanical actuation of hand-operation control components of push-button S/W and L/S and relay etc. These components let connects each other in order to control of the elevator function with the auto program and the designed sequence control circuit. Consequent1y the process of these functions of 1~5steps could operates the cage with an auto program of the elevator and the sequence control circuit. The sequence control circuit is controlled by the step of forward and reverse to follow as that the sensor function of the L/S1~L/S5 let posit with the control switchs of S/W1~S/W5 of PLC testing panel and switchs of S/W1~S/W5 installed on the transparent acryl plate of the frame. In here, improved apparatus is a hand-auto operation combined learning equipment to study the principle and a technique of the originated sequence control circuit and the auto program of PLC.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 추계학술대회 논문집 Vol.15
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• pp.210-215
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• 2002

This thesis is contents on the crystal grown by the solide phase method at $925^{\circ}C$ with orthorhombic structure that $LiMnO_{2}$ active material synthesised with precurse $Mn_{2}O_{3}$ and $LiOH.H_{2}O$ material to get three voltage level. The porosity analysis of the grown crystal in secondary batteries $LiMnO_{2}$ thin film is $1.323E+02\AA$ of the average pore diameter of powder particles and its structure to be taken the pore diameter was prepared. Adding voltage area to get properties of charge and discharge of which experiment result of $LiMnO_{2}$ thin film area 2.2V~4.3V, current and scan speed were 0.1mAh/g and $0.2mV/cm^{2}$ respectively, and properties of the charge and discharge to be got optimum experiment condition parameter and density rate of Li for analyze that unit discharge capacity with metal properties is 87mAh/g was 96.9[ppm] at 670.784[nm] wavelength, and density rate of Mn analyzed 837[ppm] at 257.610[nm]. It can be estimated the quality of thin film that wrong cell reject from the bottle of electrolyte. The results of SEM and XRD were the same that of original researchers.

• 한국식품과학회지
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• 제28권3호
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• pp.475-481
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• 1996

초임계유체를 이용하여 간단하고, 신속하고, 저렴하게 식품 중의 잔류농약을 추출, 정제하는 방법을 개발하기 위하여 10종의 유기염소계 농약에 대하여 ppm수준의 농도에서 초임계 이산화탄소를 이용하여 추출 온도 및 압력 등 추출조건을 달리하여 추출수율을 측정하였다. 초임계 이산화탄소 추출에 의한 유기염소계 잔류농약 표준용액의 회수율은 103bar에서 추출온도가 증가할수록 증가하였다. 유기염소계 잔류농약 표준용액의 최대 평균 회수율은 $40^{\circ}C/172\;bar.$에서 98.3%였다. 대구, 넙치, 오징어에 첨가한 유기염소계 농약의 평균 첨가회수율은 $40^{\circ}C/172\;bar.$에서 각각 85.6, 74.6, 83.0%였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1999년도 춘계학술대회 논문집
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• pp.133-136
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• 1999

We report on the electrochemical properly of LiZ $n_{x}$Mn $_{2-x}$ $O_4$ for different degrees of Zn substitution(x) Though all cathode material showed spinel phase based on cubic phase in X-ray diffraction, other peaks(M $n_2$ $O_3$ or M $n_3$ $O_4$) gradually exhibited and became intense with the increase of x vague in LiZ $n_{x}$Mn $_{2-x}$ $O_4$. In addtion, TG-DTA analysis exhibited that both LiM $n_2$ $O_4$ and LiZ $n_{0.1}$ M $n_{1.9}$ $O_4$ occurred the weight loss(TG) and the endothermic and exothermic reaction(DTA) until 80$0^{\circ}C$ When x=0.1 in LiZ $n_{x}$Mn $_{2-x}$ $O_4$ cathode materials showed the charge and discharge capacity of about 100mAh/g at first cycle and about 70mAh/g after tooth cycle.cle.e.cle.e.e.e.

• 한국조리학회지
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• 제7권2호
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• pp.181-194
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• 2001

Autoclaving법으로 제조한 솔잎향미유(pine needle seasoning oil, PNSO) 0~3%(w/w)와 유화제를 2:1(w/w)로 혼합하여 식염수에 용해시킨 후 이를 밀가루와 반죽하여 건면을 제조하였다. PNSO 처리량이 증가할수록 수분흡수율, 부피팽창율, 고형분 용출율은 감소하였으며, 조리시간은 연장 되는 것으로 나타나 적정 처리량은 2~3%(w/w) 수준인 것으로 판명되었다. 한편, 관능검사 결과 PNSO의 처리에 따라 조리면에서 솔잎 고유의 녹색이 나타났으며, 조리면의 표면이 매끈하였고, 쫄깃쫄깃한 rheology 및 texture가 크게 개선되었다. PNSO 2%(w/w) 이상 처리군에서는 조리 후 20~30분이 경과하여도 조리면의 쫄깃쫄깃한 특성이 그대로 유지되어 식당, 단체급식소 등의 대량 취식용으로도 적합할 것으로 판단되었다.