고성능 니켈 / 금속수소화물 전지의 음극 제조 방법 연구

오상협,이진복,방부길,강홍렬 ( Sang Hyub Oh,Jin Bok Lee,Bu Kil Bang,Hong Yol Kang ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.1

Characteristics of metal hydride(MH) electrodes fabricated by pressing and pasting method were examined in the process of developing high performance Ni/MH battery. High capacity paste-type Ni electrode with CoO and Zn(OH)₂ was used as positive electrode. MH electrode with Ni foam grid which was surface treated by PTFE, showed superior performance and it could be used in high performance Ni/MH battery. 4/5A type(φ16.5 ㎜×42.3 ㎜) Ni/MH battery has showed a discharge capacity over 1400 mAh and cycle life over 500 cycles at 100% DOD(depth of discharge). Based on the observation through post-mortem of the failed cells, failure mode in this case was assumed to be local dry out of electrolyte caused by uneven electrolyte distribution as cycle proceeds in the Ni/MH system.

소형 밀폐형 Ni / MH 전지의 개발

오상협,민형식,이진복,방부길,김명수 ( Sang Hyub Oh,Hyung Sik Min,Jin Bok Lee,Bu Kil Bang,Myungsoo Kim ) 한국공업화학회 1996 한국공업화학회 심포지엄 Vol.1 No.-

사염기 황산납의 첨가에 의한 밀폐형 납축전지의 노화 억제

김인곤,오상협,강홍렬 ( In Gon Kim,Sang Hyub Oh,Hong Yol Kang ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.2

The morphology and mechanical properties of the PAM(positive active material) after curing and formation were found to affect a great deal on the aging process of the VRLA batteries under deep discharge cycle. Two kinds of the starting materials were used. One is conventional leady oxide commonly used in the battery industry. The other is a chemically synthesized tetrabasic lead sulfate(TTB ; 4PbO·PbSO₄). The size of the leady oxide was < 1 ㎛. The PbO₂ morphology after formation had the form of a blossom consisting of particles of ∼0.2 ㎛ in size. The cohesion force of this type of active material was 0.4 ㎏. The needle-shaped TTB having the size of 30-50 ㎛ was metasonically transformed to the lead dioxide formation i.e. the shape and size were maintained. The cohesion forces of the PAM containing 50% TTB and 100% TTB were 1.2 ㎏ and 1.7 ㎏, respectively. In the case of the VRLA cells made from leady oxide, the cycle life was about 220 cycles at 80% depth of discharge. It was found that the main cause of aging was the development of the coralloid structure resulting from the disintegration and rearrangement of the PAM. Whereas the addition of the TTB greatly retarded development of the coralloid structure, thus resulted in a significant improvement in cycle life. The cycle lives of the VRLA batteries with PAM containing 50% and 100% TTB were 800 and 1,000 cycles, respectively. It was found that the failure mode in this case was primarily grid corrosion.

푸리에 변환을 이용한 전기화학적 임피던스 측정 시스템 제작

황의진,오상협,Hwang, Eui-Jin,Oh, Sang-Hyub 대한화학회 1991 대한화학회지 Vol.35 No.6

Electrochemical impedance measurement system using Fourier transform was constructed in the range of the frequencies up to 100 kHz. This system consists of pseudo-random noise generator, specially designed potentiostat, fast data acquisition system, system controller, and computer interface. The performance of the constructed system was found to be almost same as the commercially available system using lock-in amplifier. Measuring time was significantly reduced because the minimum time for the measurement depended on one cycle of the lowest frequency used. It would be possible to study time-varying electrochemical impedance systems such as the initial stages of corrosion processes using this system. 푸리에 변환을 이용하여 100kHz의 주파수 범위까지 사용할 수 있는 전기화학적 임피던스 측정시스템을 제작하였다. 이 시스템은 신호 발생기, 특수하게 고안된 정전위기, 고속 자료수집 장치, 시스템 제어기 및 컴퓨터 인터페이스로 구성되었다. 우리가 제작한 시스템은 lock-in amplifier를 사용하는 상품과 성능이 비슷하였다. 측정에 소요되는 최소 시간은 사용된 최적 주파수의 한 주기에 해당하므로 상당히 짧아졌다. 이 시스템을 사용하면 부식 초기와 같이 시간에 따라 변하는 전기화학적 계면현상을 임피던스 측정법으로 연구할 수 있으리라 전망된다.

흐름주입법에 의한 Melamine 정량을 위한 Ruthenium-Ce(IV) 시스템의 백금 나노입자 증강 화학발광

이상학 ( Sang Hak Lee ),오상협 ( Sang Hyub Oh ),김영호 ( Young Ho Kim ),( M. Mahabub Khan ),( M. Arifur Rahman ),( Al Mahmnur Alam ),( Mohammad Kamruzzaman ) 한국공업화학회 2012 응용화학 Vol.16 No.1

A chemiluminescence (CL) method is reported for the determination of melamine by flow injection analysis (FIA). This method is based on the reaction of melamine with Ru(bipy)3 2+ and Ce(IV) in presence of colloidal platinum nanopartilces to produce CL. Under optimal condition, CL intensity was linearly related with melamine concentration. The calibration curve was linear over the range of 5.0×10-9-2.0×10-6 M with the limit of detection, 9.8×10-9 M. The relative standard deviation of 1.0×10-7 M melamine was found 2.5% (n=10).

Europium(III)-Doxycycline 복합체의 은나노입자 증강 발광 및 이의 분석적 활용

이상학 ( Sang Hak Lee ),오상협 ( Sang Hyub Oh ),김영호 ( Young Ho Kim ),( Anm Hamidul Kabir ),( Mohammad Kamruzzaman ),( Al Mahmnur Alam ) 한국공업화학회 2012 응용화학 Vol.16 No.1

A simple and sensitive fluorometric method has been proposed by the enhanced luminescence from the europium (Eu3+)-doxycycline (DC) complex in the presence of silver nanoparticles (AgNPs). The enhancement of the luminescence from the Eu3+-DC complex by AgNPs was accredited due to the transfer of resonance energy to the fluorophores through the interaction of the excited-state fluorophores and surface plasmon electron in the metal nanosurface. The enhanced luminescence intensity was linearly proportional to the concentration of DC in the range of 3.0×10-9-1.7×10-7 g mL-1. The limit of detection was found to be 4.0×10-10 g mL-1. The proposed method has been applied successfully to determine DC in pharmaceuticals and biological samples.

용해기체 분석용 기체감응막 이온선택성 전극 (제 4 보) 관형 PVC막 pH전극을 이용한 황화이온의 연속 · 자동화 정량

이흥락,배준웅,오상협,Lee Heung Lark,Bae Zun Ung,Oh Sang-Hyub 대한화학회 1992 대한화학회지 Vol.36 No.5

황화이온검출기로서 2가지 형태의 연속 flow-through 전극계의 분석적 감응성질을 조사하고, 최적조건에서 그들의 감응특성을 직접 비교하였다. 두 검출계에 있어서 측정한 봉우리전위를 황화이온농도의 대수값과 관련지웠으며, 적어도 시간당 20개의 시료를 정량할 수 있었다. pH전극법에서는 투석기를 지나 흘러가는 recipient stream의 pH를 측정하였다. 장치는 연속흐름형의 기체투석기가 관형 polymer 막전극과 연결되도록 설계되어 있다. 이 방법의 최적실험조건은 recipient $5.0 {\times} 10^{-5} M NaOH + 5.0 {\times} 10^{-3} M$ NaCl과 diluent 0.10M $H_2SO_4$이며, recipient stream, diluent stream 및 시료의 유속은 모두 1.0ml/min이다. 황화이온 전극법에서는 시판하는 황화이온선택성 전극을 flow-through cell 속의 황화이온을 검출하는 데에 썼다. 이 방법의 최적실험조건인 황화이온 산화방지 완충제(1.0M NaOH 용액에 3.5g 아스코르브산과 7.6g $Na_2EDTA$를 용해)와 시료의 유속은 각각 1.4 ml/min와 1.0 ml/min이다. The analytical response properties of two types of continuous flow-through electrode system as fulfide ion detectors are examined and directly compared their reponse characteristics under the optimal conditions. In both detection systems, observed peak potentials are logarithmically related to the sulfide ion concentration and at least twenty samples per hour can be determined. In the pH electrode method, the pH of the flowing recipient stream leaving the dialyzer was monitored. The designed system involves the use of continuous flow gas dialyzer in conjunction with the tubular polymer membrane electrode. In this method, optimal experimental conditions are recipient of mixture of $5.0 {\times} 10^{-5} M NaOH + 5.0 {\times} 10^{-3} M$ NaCl and diluent of 0.10 M $H_2SO_4$, and all flow rates of recipient stream, diluent stream, and sample are 1.0 ml/min. In the sulfide ion electrode method, a commercially available sulfide ion-selective electrode was used to detect sulfide ion in the flow-through cell. The optimal flow rates of sulfide anti-oxidant buffer (3.5 g ascorbic acid and 7.6 g $Na_2EDTA$ dissolved in 1.0 M NaOH solution 1 l) and sample were 1.4 ml/min and 1.0 ml/min, respectively.

악취측정용 10 μmol/mol 황화수소 표준가스 개발

김용두,배현길,김달호,오상협,이진홍,이상일,Kim, Yong-Doo,Bae, Hyun-Kil,Kim, Dalho,Oh, Sang-Hyub,Lee, Jin Hong,Lee, Sangil 한국가스학회 2018 한국가스학회지 Vol.22 No.2

산업이 급속하게 발전함에 따라 자연 대기에서 악취를 유발하는 매우 적은 양의 황화수소가 존재합니다. 매립 및 하폐수처리장에서 나오는 황화수소 성분은 대기에 존재하므로 많은 민원이 발생됩니다. 민원이 발생하는 악취가스를 측정하기 위해 $10{\mu}mol/mol$ 농도 수준의 황화수소 인증표준물질(Certified reference material)을 개발하고자 하였다. 질소 안에 $10{\mu}mol/mol$ 수준의 황화수소 가스 제조는 ISO 6142에 의한 중량법을 사용하였다. 4 개의 알루미늄 실린더에 가스 CRM을 제조하고 GC-AED로 그 농도를 확인했습니다. 제조의 불확도는 0.50 % 미만이었고, 제조일치성은 0.22 %이었다. 실린더의 내부 흡착은 1500 psi에서 0.10 %이었고 1 년 동안 장기간 안정한 것으로 평가되었다. 이 황화수소 CRM의 제조 일치성, 실린더의 흡착 및 장기 안정성에 대한 상대 확장불확도는 1.05 %(신뢰도 95 %, k = 2) 이내로 개발되었다. Hydrogen sulfide from landfill and sewage treatment plant is a major odor component and causes many civil petitions. Rapidly developing industries release hydrogen sulfide, an odorous gas, to the atmosphere. This study aims to develop a $10{\mu}mol/mol$ concentration level hydrogen sulfide primary standard gas for odor measurement. The hydrogen sulfide gas was prepared at a nominal concentration of $10{\mu}mol/mol$ in nitrogen using the gravimetric method described in ISO 6142. Replicate standard gases were produced in 4 aluminium cylinders, and their concentrations were verified by GC-AED. The uncertainty of production was less than 0.50 %, and the variation of the 4 replicates was 0.22 %. The wall adsorption of hydrogen sulfide in cylinders was 0.10 % at 1500 psi, and the concentration was estimated to be long-term stable for one year. The relative expanded uncertainty of the preparation consistency, adsorption and long-term stability of this hydrogen sulfide standard gas was less than 1.05 % (95 % of confidence level, k=2).

image Color Appearance Model을 기반으로 한 HDR Tone Mapping 시스템 설계

김남훈(Nam-Hun Kim),오상협(Sang-Hyub Oh),이동호(Dong-Ho Lee) 대한전기학회 2009 정보 및 제어 심포지엄 논문집 Vol.2009 No.10

일반적으로 HDR(High Dynamic Range) 영상을 제한적인 다이내믹 레인지를 가진 CRT나 LCD같은 디스플레이 장치에 표현하기 위해서는 톤 매핑(tone mapping)이란 방법을 통해야 한다. 톤 매핑의 대부분은 Photos hop CS3, Photomatix와 같은 컴퓨터 소프트웨어를 사용한다. 본 논문에서는 정지 영상분야에서 사용될 수 있는 하나의 톤 매핑 모델 중 하나인 iCAM((image Color Appearance Model)을 기반으로 한 HDR Tone Mapping 시스템 설계를 하드웨어 언어(HDL)중 하나인 verilog를 이용하여 구현하는 방법을 제안한다. 제안한 verilog로 구현하는 방법은 소프트웨어 방법보다 시간을 줄일 수 있으며, 차후 칩으로 만들어질 경우 공간 또한 줄일 수 있다. 시뮬레이션 프로그램으로 ModelSim 6.3f, MATLAB R2009a를 사용하였으며, ALTERA사의 IP(Intellectual Property)를 이용하여 verilog code로 구현된 시뮬레이션 결과와 MATLAB code로 구현된 시뮬레이션 결과의 오차에 큰 차이가 없음을 확인하였다.

금 나노입자의 증감효과를 이용한 화학발광법적 Perphenazine 정량

( Al Mahmnur Alam ),( Mohammad Kamruzzaman ),이상학 ( Sang Hak Lee ),김영호 ( Young Ho Kim ),장택균 ( Taek Gyun Jang ),홍석주 ( Suk Joo Hong ),오상협 ( Sang Hyub Oh ) 한국공업화학회 2011 응용화학 Vol.15 No.2

A rapid and sensitive chemiluminescence (CL) method was designed for the determination of trace amount of perphenazine (PERN) based on the gold nanoparticles enhanced luminol-H2O2-PERN system. The degree of enhancement of CL signal intensity of the system was proportional with the concentration of PERN. Under optimum experimental conditions, the linearity of CL signal intensity was observed in the range of 3.5×10-9 to 2.0×10-7 mol/L (r2= 0.9995) with a detection limit of 1.37×10-9 mol/L. Precision of the method was tested at the concentration level of 1.0×10-7 mol/L for 8 replicate measurements giving value of RSD 2.25%.