용융탄산염연료전지용 Ni-Al anode의 젖음성

박권필 순천대학교 공업기술연구소 1995 工業技術硏究所論文集 Vol.9 No.-

Wettability of Ni-Al anode for molten carbonate fuel cell was studied at MCFC anode condition. Meniscus effect was measured by cyclic voltametry in -950~-160mV range and meniscus height was measured at in situ condition. Wettability of Ni-Al anode in molten carbonate(Li/K, 62/38) was larger than that of pure Ni anode. It was seemed that increase of the wettability of Ni-Al anode resulted from LiAlO_2 formation.

미역 폐기물을 이용한 시안 폐수의 처리에 관한 연구

우명우,박권필 順天大學校 1999 論文集 Vol.18 No.1

Cyanide wastewater treatment by brown seaweed wastes was studied. From these results we can conclude that most of cyanide in wastewater can be removed by seaweed. Even though longer reaction time required to attain certain level of cyanide removal, using brown seaweed can be an alternative method. Compared to calcium hydroxide treatment, seaweed shows lower removal capacity to that of calcium hydoxide by the factor of 0.7. and reaction time increases by two.

연구원 활동 : 발표논문요약 ; < 화학공학분야 >

(Gwun Pil Park),(Hai Soo Chun) 고려대학교 공학기술연구소 1996 생산기술연구소보 Vol.3 No.-

알루미늄-공기 전지의 전극성능에 미치는 아연화합물 첨가의 영향

박권필 順天大學校 1995 論文集 Vol.14 No.1

The effect of Zn-compound addition on the Al-anode corrosion and on the cathode performance was investigated. At open circuit voltage Al-anode corrosion rate and hydrogen evolution rate were decreased with Zn-compound addition in 4M KOH electrolyte. Zinc compound(zinc accetate) addition in electrolyte had no influence on the cathode performance in 100 hour unit cell operation.

용융탄산염연료전지내 Ni-Al Anode의 성능모사

박권필 순천대학교 기초과학연구소 1995 基礎科學硏究誌 Vol.6 No.-

The performance of Ni-Al anode in MCFC was simulated by the filmed agglomerate model, since wettability of Ni-Al anode was similar to that of NiO cathode. The performance of Ni-Al anode simulated by the filmed agglomerate model was affected greatly by the film thickness, and the effect of activation polarization on the anode was similar to that of mass diffusion polarization.

전해질 첨가제가 알루미늄 - 공기전지의 성능에 미치는 영향

박권필,전해수 ( Gwun Pil Park,Hai Soo Chun ) 한국공업화학회 1998 공업화학 Vol.9 No.1

알루미늄-공기전지의 4M KOH전해질에 아연화합물과 같은 첨가제를 넣어 수소발생 및 알루미늄의 부식에 미치는 영향을 검토하였다. 첨가제중의 아연화합물들은 수소발생과전압을 증가시키고, TPC(tripotasium citrate)와 CaO는 알루미늄표면에 치밀한 막을 형성하여 수소발생속도와 알루미늄부식속도를 감소시켰다 이들 첨가제들에 의해 고순도알루미늄(순도, 99.999%)의 개회로전위는 양의 방향으로, 알루미늄 No 1050(순도, 99.5%)의 개회로전위는 음의 방향으로 약간 이동했다. 개회로전위에서 첨가제는 수소발생속도와 알루미늄 부식속도를 감소시켰으며, 과전압이 증가할수록 수소발생속도가 감소하여 알루미늄의 이용율이 증가하였다. 높은 전류밀도(>100mA/cm²)에서는 TPC/CaO/ZnO 첨가제에 의해 고순도 알루미늄의 이용율이 In,Ga,Tl 합금 알루미늄의 이용율과 비슷하였다. The effects of additives such as zinc compounds in 4M KOH electrolyte of Al-air cell have been studied. Zinc compounds in electrolyte increased hydrogen evolution overpotential and TPC(tripotasium citrate)/CaO formed fine film on aluminum surface, and these additives decreased hydrogen evolution rate and corrosion rate of aluminum. These additives shifted the OCP in the positive direction on high purity aluminum(purity, 99.999%) and in the negative direction on Al No 1050(purity,99.5%). Addition of two or more additives resulted in the prevention or the reduction of corrosion rate and hydrogen evolution at OCP. As the overpotential on Al electrode increased, the hydrogen evolution rate decreased and the utilization of aluminum increased. At high current density(>100mA/cm²), TPC/CaO/ZnO additives increased the utilization of high purity aluminum up to that of aluminum alloys containing indium, gallium and thallium.

SVG에 기반한 홈 네트워크 모바일 사용자 인터페이스 디자인

유기필(Ki-Pil Yu),권오봉(Ou-Bong Gwun),박덕규(Deok-Gyu Park) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.1

핸드폰이나 PDA(Personal Digital Assistants) 등 휴대용 단말기의 보급이 급속히 늘어나면서 이를 통한 모바일 콘텐츠 수요가 폭발적으로 증가하고 있다. 이에 따라 비전문적인 개발자가 사용자 인터페이스를 편리하게 디자인 할 수 있는 환경을 구축하는 것이 중요하게 되었다. 본 논문에서는 적은 용량으로 고품질의 그래픽을 구현할 수 있는 2D 벡터그래픽 표준인 SVG(Scalable Vector Graphics)를 사용하여 홈 네트워킹을 제어하는 모바일 기기(PDA)의 사용자 인터페이스를 디자인하는 방법에 대하여 고찰한다. 본 논문에서 제안하는 방법의 특징은 선호인터페이스(Preference Interface) 설정, 하향식(Top-Down) 방식 화면구성, 그리고 동적 SVG 이미지 활용 등이다.

거제도 백로와 서식지 환경표본에서 분리한 Salmonella의 Serotypes 분포 조사 및 Molecular Typing

우용구,박진영,이영주,권용국,모인필 한국수의공중보건학회 2001 예방수의학회지 Vol.25 No.3

Since 1997, three large scale unknown death had consecutively appeared in the wild heron flocks in Geo-Je island until 1999. Until now, there has been only a little information on the Salmonella spp. originated from the wild animals in our peninsular. Hence, the objective of this study was to obtain the epidemiological characteristics related to Salmonella strains cultured from wild herons and environmental samples in Geo-Je island using the serotyping, antibiograms, plasmid profiles, and random amplified polymorphic of DNA (RAPD) profiles. A total of fifty-five Salmonella strains were isolated from liver and cecal contents of wild herons captured in Geo-Je island on August in 2000. Among the wild heron species tested, Ardea Cinerea jouyi (Clark) was shown the most high Salmonella isolation frequency (38.5%) and Egretta alba modesta (Gray) was followed as 15.4% (2/13), but any Salmonella could not isolate from the other species. Among the five serotypes identified, S. typhimurium (70.3%) was the most predominant serotype in the wild heron flocks and S. hadar (21.3%), S. wippra (4.3%), S. california (2.2%) and S. chincol (2.2%) were followed in order. S. wippra and S. chincol were reported as the first time among the domestic avian Salmonella serotypes since 1994. Three serotypes including S. typhimurium, S. hadar and S. chincol were commonly cultured from the internal organs of herons, whereas S. wippra was cultured only from the environmental sample, especially in the earth sample. In antimicrobial drug susceptibility test, all Salmonella strains from internal organs of heron were susceptible to all drugs tested, whereas strains from environmental samples were shown the resistance to carbenicillin, doxycyclin, tetracycline and oxytetracycline, respectively. Antibiogram pattern alone could discriminate into two types depending on their isolated origins. The serotype specific plasmid (60 MDa) was found in most of ST isolates (65%) and all strains had also the invA gene (284 bp) by PCR. These two genetic materials (SSP and invA gene) were known as a kind of virulence factors of pathogenic ST strains. The genetic relatedness was also compared between the ST strains from different sources using the random amplified polymorphism of DNA (RAPD) method. As a results, the present method was found as a rapid, efficient and useful tools to differentiate the same Salmonella serotype without specific difficulties in manipulation.

용융탄산염연료전지의 anode 반응에서 물질전달의 영향

전해수,박권필 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.6

용융탄산염연료전지에서 anode의 수소산화 반응에 미치는 물질전달의 영향을 규명하기 위해, 정상상태 분극실험으로 반응물과 생성물의 확산영향을 보았고, Ni 및 Ni-Al anode의 금속투과 수소확산계수를 정전류기법 (galvanostatic method)으로, 그리고 이들의 교환전류밀도를 전이상태 분극실험으로 구하였다. 생성물과 반응물의 확산이 anode의 반응속도에 비슷한 정도로 영향을 주었으며, 알루미늄이 니켈에 첨가됨으로 인해 금속투과 수소의 확산계수와 교환전류밀도가 감소됨을 확인하였고 그리고 수소 확산속도 감소에 따라 교환전류밀도도 감소됨을 알 수 있었다. The effect of mass transfer on the hydrogen oxidation reaction at molten carbonate fuel cell (MCFC) anode were studied. The effects of reactant diffusion and of products diffusion on the rate of the anode racoon were studied with steady-state polarization experiment. The exchange current densities of Ni-anode, Ni-Al anode were obtained by a transient method and diffusivities of hydrogen through these anodes were measured by galvanostatic method in MCFC anode half cell. The effect of products diffusion on the rate of anode reaction was same that of reactant diffusion. It was found that the diffusivities of hydrogen and the exchange current densities of the anodes were decreased by adding aluminum into the nickel anode. It was seemed that decrease of exchange current densitiy resulted from decrease of hydrogen diffusivity through the anode.

Pack Cementation 법으로 제조된 MCFC 용 합금 Anode 의 특성

전해수,박권필,임희천,정하철 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.6

용융탄산염 연료전지(MCFC)용 anode 재질로써 촉매 성능면이나 가격면에서 가장 적합한 것은 Ni이나, 순수한 Ni만으로 제조된 anode는 고온에서 크립(creep)현상이 커서 이의 해결책이 강구되어져야만 한다. 본 연구에서는 이 크립 현상을 감소시키기 위한 한 방법으로 pack cementation 기법을 이용하여 다공성 Ni-anode소재에 Ni-Al, Ni-Cr, Ni-Al-Cr등의 합금 형태(금속간 화합물 또는 고용체)가 되도록 처리한 후 해당 재질들의 크립 특성을 검토하였다. 이때 팩(pack)성분은 증착시키려는 금속 분말과 활성제(NaCl, NH₄Cl), 그리고 비활성 충전물(Al₂O₃)로 구성되었고 온도는 550-900℃의 범위에서 0.5-5시간 동안 반응시켰다. 다공성 Ni 소재에 해당 금속의 증착량은 반응 시간의 제곱근에 비례하는 형태를 나타내었으며 증착량이 증가할수록 다공성 Ni소재 anode의 기공도는 선형으로 감소하였다. 순수한 Ni소재 anode에 비하여 합금 형태 anode는 크립 현상이 크게 감소함을 보였고 특히 Al과 Cr이 동시에 증착된 합금 전극의 수축률이 가장 낮은 1-2%의 값을 보였다. The pack cementation process of metal(Al, Cr) halide vapor on a porous pure Ni-anode substrate for molten carbonate fuel cell was studied to improve creep resistance of the anode substrate. The pack consists of metal powder(Al, Cr or Al-Cr mixture), activator(NaCl or NH₄Cl) and inert filler(Al₂O₃). The pack cementations on the nickel-anode substrate were carried out at 550-900 ℃ for 0.5-5.0 hours. It was found that various intermetallic compounds for Al(Ni₃Al, NiAl, or Ni₂Al₃) and some of solid solution between Ni and Cr were formed on the porous Ni-anode substrate and the deposition weight of metals depending on time was parabolic. The porosity of the alloy anodes(intermetallic or solid solution) decreases linearly with deposition content of metallic additives. The Ni-anodes deposited as Ni-Al intermetallic form and codeposited with Al and Cr showed good performance against creep and its pore structure did not change after pack cementation. The Ni-anode substrate, which Al and Cr were codeposited on, showed about 1 % creep strain under 650 ℃ and 100 psi after 100 hour.