전자산업 협력업체 안전관리 개선방안 연구

김헌수,박해천 조선대학교 생산기술연구소 2005 生産技術硏究 Vol.27 No.2

Lately, electronics industries manufacture electronic products in cooperation between mother companies producing finished goods and sub-contractors delivering parts to them. So, in electronics industries, not only are the manufacturing activities of mother companies important but also are the manufacturing activities of sub-contractors supplying various components to their customers important. With this environment, it is difficult to survive in the global competitions not only for the parts suppliers but also for the customers being supplied with parts by their part sub-contractors. But, it is getting specialized so the customers could not survive without their sub-contractors. So, the customers need to consider their suppliers as their extended production lines and introduce a comprehensive safety management support system to prevent industrial accidents by implementing systematic safely management support activities.

전격성 경과를 취한 만성 호산구성 폐렴 환자 1예

윤호상,진춘조,유광하,이상엽,이수인,정상만,김선두,이순제,이길도,전혜정 건국대학교 의과학연구소 2000 건국의과학학술지 Vol.10 No.-

Chronic eosinophilic pneumonia(CEP) is a rare disease of unknown etiology characterized by chronic infiltration of the lung with eosinophils. It presents with profound systemic symptoms comprising fever, night sweats, weight loss, dyspnea and blood eosinophilia with nonsegmental air-space consolidation confined to the outer third of the lung, the "photographic negative of pulmonary edema". Histopathologic features of chronic eosinophilic pneumonia are intraalveolar and interstitial infiltrations with eosinophils, histiocytes, giant cells, scattered lymphocytes and plasma cells. Glucocorticoid therapy cause prompt resolution of symptoms as well as disappearans of blood eosinophils, elevated serum Ig E levels and the roentgenographic lesions. Infrequent radiographic findings include nodular infiltrates, consolidations, cavitations, atelectasis and pleural effusions. Deaths from CEP although rare, have been reported, but the majorities of CEP have benign courses and do not need a therapy with ventilator. We report a case of chronic eosinophilic pneumonia, which had a sudden course associated with diffuse pneumonic consolidations on the both lung and bilateral pleural effusion.

Effect of Ni3Al Inelusion on Pore Structure in the Porous Anode for Molten Carbonate Fuel Cell

Chun, Hai Soo,Kim, Yun Sung,Choo, Hyun Suk,Shin, Min Cheol,Hong, Ming Zi,Lim, Jun Heok 한국화학공학회 2000 Korean Journal of Chemical Engineering Vol.17 No.5

Microstructural changes in pure Ni, Ni/(4-10 wt%)Ni₃Al and Ni/5 wt%Ni₃Al/5 wt%Cr anodes for molten carbonate fuel cell were investigated by sintering experiment. Submicron-sized Ni₃Al intermetallic particles were dispersed in nickel powders to improve mechanical strength by dispersion strengthening and to control both densification and pore structure of these anodes during sintering. The mechanical strengths of Ni/7 wt%Ni₃Al and Ni/5 wt%Ni₃Al/ 5 wt%Cr anodes were considerably higher than that of the pure Ni anode by strong bonding between small nickel grains. Pore volume in the anodes which included Ni₃Al was considerably high by impeding nickel grain growth, because the retarding force exerted by the Ni₃Al inclusion obstructed the nickel grain boundary movement. Pore structure in the anodes was maintained in a relatively stable open network in contrast with that in the pure Ni anode.

Enhancement of Mass Transferin the Fluidized Bed Electrode Reactors

Chun, Hai Soo,Hwang, Young Gi 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.6

With the view of developing the fluidized bed electrode system, mass transfer coefficient, overpotential distribution, and copper degradation have been observed in this investigation. Particles whose diameters were one of 327, 388, 510, 548, 750, and 960㎛ were fluidized by the 1,000ppm copper sulfate electrolyte. This study used two types of the experimental reactor. One had 5×5.5㎝ bed-dimension with various thickness in a rectangular side-by-side configuration; the other 3.2cm bed-diameter with various height in a cylindrical flow-through configuration. Mass transfer coefficient increased with increasing particle diameter, and the optimum fluidization was obtained at the condition of bed porosity near 0.65. For processing a large fluidized bed reactor, the expansion of bed height at a distance between electrodes was found to be more effective than the enlargement of bed thickness between electrodes. By replacing a three-dimensional current-feeder with a plane feeder, degradation and residual concentration of copper ion in a batch recycling mode could be achieved to be higher than 99% and less than 5㎎/L, respectively.

21세기의 청정에너지

전해수,임준혁 고려대학교 공학기술연구소 1994 고려대학교 생산기술연구소 생기연논문집 Vol.30 No.1

초임계 이산화탄소에 의한 활성탄내의 폐놀 탈착속도

전해수,이윤용,김재덕 한국화학공학회 1988 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.26 No.4

초임계 이산화탄소에 의한 활성탄에 흡착된 페놀의 탈착특성에 대해 실험 및 이론적으로 검토하였다. 35-55℃, 100-200bar의 조건에서 초임계 이산화탄소를 1-8SLPM의 유속으로 통과시켜 페놀을 탈착시킬때 이산화탄소에 녹는 페놀의 용해도가 큰 온도와 압력에서 그리고 활성탄과 이산화탄소사이의 접촉시간이 길 때 페놀의 탈착율은 증가하였다. 또한 일정탈착조건에서 초임계 이산화탄소에 의하여 탈착되지 않는 비가역 페놀의 존재를 확인하였으며 이 양은 흡착노출시간이 길고 활성탄에 흡착된 최초 페놀흡차량이 많을수록 증가하였으나 그 분율은 최초 페놀흡착량이 많을수록 감소하였다. 한편 1차 탈착후 얻은 활성탄의 페놀흡착성능은 virgin 활성탄의 흡착성능에 비해 약 30% 정도 감소하였으나 2차 및 3차 탈착후부터는 그 차이가 크게 줄어들었으며 탈착속도 실험결과는 비가역 페놀의 존재를 고려한 Modified Thomas model에 의하여 상관지을 수 있었다. Desorption characteristics of phenol from activated carbon with supercritical carbon dioxide was studied experimentally and theoretically. Experiments were carried out at pressure of 100-200 bar and temperature of 35-55℃ with carbon dioxide flow rate of 1-8 SLPM. At constant temperature, higher pressure is favorable to desorb phenol from activated carbon having the same adsorption history such as adsorption exposure time and phenol loading. At constant pressure, higher temperature at 200 bar and lower temperature at 100 bar were favored, showing that solubilities of phenol in supercritical carbon dioxide play an important role in desorbing phenol. There exist some irreversible phenol adsorbed in activated carbon that cannot be desorbed with supercritical carbon dioxide under constant desorption condition. The fraction of irreversibly adsorbed phenol was increased as the adsorption exposure time was longer and the initial phenol loading onto activated carbon was decreased. Model study was conducted to express the desorption rate in fixed bed. Experimental data for the desorption rate were well correlated by modified Thomas model.

유동층전극반응기내 물질전달

전해수 한국화학공학회 1984 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.22 No.6

산성구리용액으로 전도성입자(구리입자) 그리고 비전도성입자(유리구)를 유동화시키며 음극 고정측정단자와 자유로이 움직이는 측정단자에 의하여 유동층반응기내 입자-유체간 물질전달속도를 측정하였다. 그 결과: 1) 전도성입자 유동층전극반응기에서 물질전달 상관식은 j_Mε=0.78(R_(e,p)/1-ε)^(-0.50) (d_p/d_H)^(-0.50) 이때 실험범위는 38<R_(e,p)/1-ε<380 이었고 R_(e,p)는 입자경을 기준한 Reynolds number이다. 2) 비전도성입자 유동층반응기에서 물질전달 상관식은 j_Mε=0.71(R_(e,p)/1-ε)^(-0.41) (d_p/d_H)^(-0.41) 이때 실험범위는 17<R_(e,p)/1-ε<210이다. Mass transfer rates between parkicles and electrolyte have been determined by means of the fixed or moving electrodes in the beds of conducting copper particles and of nonconducting glass beads which were fluidized by acidified copper solution. The experiment have been carried out with the variation of bed expansion, particle size, and bed height. 1) Mass transfer data with the active fluidized bed of conducting copper particles in the range 38<R_(e,p)/1-ε<380 were correlated by the equation j_Mε=0.78(R_(e,p)/1-ε)^(-0.50) (d_p/d_H)^(-0.50) the Reynolds number (R_(e,p)) is based on the particle diameter. 2) Mass transfer data within the fluidized bed of inert glass particles in the range 17<R_(e,p)/1-ε<210 were correlated by the equation j_Mε=0.71(R_(e,p)/1-ε)^(-0.41) (d_p/d_H)^(-0.41) the d_H mean hydraulic diameter.

초임계유체와 염을 이용한 에탄올농축에 관한 연구(1) : CO2 - C2H5OH 계와 CO2 - H2O 계의 고압기액평형 High Pressure Vapor - Liquid Equilibria for Co2 - C2H5OH and CO2 - H2O Systems

전해수,이윤용,김재덕,임종성,조정식,박선근 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.1

기상과 액상 모두를 계속해서 순환시키는 상평형실험장치(circulation type)를 이용하여, CO₂-C₂H_5OH계에 대한 고압기액상평형실험을 313.2 K, 323.2 K, 333.2 K에서 압력 (약 5 ㎫-혼합물의 임계압력부근)을 변화시키면서 수행하였다. 각각의 온도에 대한 혼합물의 임계압력은 8.1㎫, 9.3㎫, 10.6㎫ 정도로서 온도가 증가할수록 혼합물의 임계압력이 증가하는 것을 알 수 있었다. 또 CO₂-C₂H_5OH 및 CO₂-H₂O계의 고압상평형자료를 Adachi와 Sugie의 혼합법칙을 사용한 Patel-Teja의 3차상태방정식에 적용하여 상관시켜 본 결과 만족할 만한 상관결과를 얻었다. High pressure vapor-liquid equilibria for CO₂-C₂H_5OH system were measured at three temperatures of 313.2 K, 323.2 K and 333.2 K using a circulation type of apparatus in which both vapor and liquid phase were continuously recirculated over a pressure range from ca. 5 ㎫ up to near mixture critical point. The critical pressures of the mixtures were about 8.1 ㎫, 9.3 ㎫ and 10.6 ㎫ at the three temperatures, respectively. This result shows that the temperature increases with the critical pressure of the mixture. The high pressure vapor-liquid equilibrium data for CO₂-C₂H_5OH and CO₂-H₂O systems were satisfactorily correlated by applying the Patel-Teja equation of state with the Adachi-Sugie mixing rule.

망사 충전 고정층 반응기의 특성 : 농도 분포 Concentration Distribution

전해수,임종성,김봉현,박권필 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.2

망사 충전물을 삽입한 촉매고정층 반응기에서 농도분포에 대하여 연구하였다. 에탄올 탈수 반응이 일어나는 활성알루미나 입자고정층 및 망사 충전물을 삽입한 고정층을 설치하여 유속분포가 다른 조건하에서 농도분포를 측정하였다. 기벽 인접 영역에서의 공극율의 불균일로 인해 유체유속분포와 농도분포가 불균일하지만 고정층에 망사 충전물을 삽입함으로 인해 농도분포를 균일하게 할 수 있었다. 공극율 및 망사 충전물의 삽입효과를 고려한 고정층 내 운동량 및 물질전달 지배방정식의 수치해로 구한 에탄올 출구농도는 에탄올 검류관으로 측정한 실험치와 비슷한 값을 보였다. The concentration distribution in a catalytic packed bed with packing was studied. The resistance to flow in the bed, packed with activated alumina particles to catalyze ethanol dehydration reaction, varied by inserting screen-packing and different size particle section. It was found that the velocity- and concentration-profiles were non-uniform due to the variation of void fraction near the wall. The effect of inserting the screen-packing in the bed enabled velocity- and concentration-profiles to be uniformly distributed over the bed. The governing equations for momentum- and mass-transport in the fixed bed and the fixed bed containing a screen-packing were numercasslly solved to demonstrate the effects of the void fraction and the screen-packing inserted in the bed. Effluent ethanol concentrations, measured by ethanol detector tube, were found to be varied with radial position in a manner consistent with the modeling equations.

용융탄산염 연료전지용 Perovskite 전극에 대한 연구 : 1. 제조방법 , 전기전도도 및 용해도 1. Preparation Process , Electric Conductivity and Solubility

전해수,임준혁 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.1

용융탄산염 연료전지의 산소전극 대체가능물질로 페로브스카이트 화합물[La₁, _xSr_xCoO₃(x=0, 0.2. 0.4), La_(0.8)Sr_(0.2)CuO₃]을 선정하고 citrate sol-gel법과 EDTA sol-gel법을 이용하여 제조하고 물성, 전기전도도 및 전해질(Li/K=62/38 mole%, 650℃)에 대한 용해도를 제조방법, 온도, Sr 치환량에 대하여 실험하였다. 전해질에 대한 페로브스카이트 전극재료의 용해도는 Sr환량, 소결시간이 증가함에 따라 증가하였다. 페로브스카이트 전극의 전기전도도는 Sr의 치환량에 따라 증가하였고 NiO 전극과 비교하여 선택한 페로브스카이트 모두가 높은 값을 보였다. The perovskite compounds[La₁, _xSr_xCoO₃(x=0, 0.2. 0.4), La_(0.8)Sr_(0.2)CuO₃] were selected as the possible altemate materials for the MCFC cathode and were synthesized by the citric acid and the ethylendiaminetetraacetic acid(EDTA) sol-gel methods. Those equilibrium solubilities were investigated in molten Li/K(=62/38 mole%) carbonates at 650℃. And the conductivity of perovskite at high temperature was measured. With increasing Sr contents, the solubility and conductivity of perovskite cathodes were increased. With increasing sintering time, the solubility was decreased.