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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.
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.
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.
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.
Poly ( acrylonitrile ) - L1계 폴리머 전해질의 전기화학적 성질
전해수(Hai Soo Chun),김형선(Hyung Sun Kim),조병원(Byung Won Cho),윤경석(Kyung Suk Yun) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.1
The electrochemical properties of polymer electrolyte encapsulated LiClO₄, LiAsF_6, LiBF₄, LiPF_6 lithium salts and ethylene carbonate(EC), propylene carbonate(PC) organic solvent in polyacrylonitrile(PAN) matrix were investigated. The ionic conductivity of polymer electrolyte of all the composition showed in the range 10^(-3)-10^(-4)s/㎝ at room temperature. The interfacial resistance between lithium electrode and polymer electrolyte with time was the most stable when EC/PC organic solvent ratio is 75 : 25. The ionic conductivity and interfacial resistance of polymer electrolyte containing lithium salt LiPF_6 in this solvent ratio showed stable value with storage time. This electrolyte was electrochemically stable up to 4.3 V(vs. Li^+/Li), so that it could be apply to lithium polymer battery. The diffusion coefficient of lithium ion in polymer electrolytes was 4×10^(-7) ㎠/sec and the exchange current density decreased with time.
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.
Hai-Kyung Seo,신동훈,Jae Hwa Chung,Beomjoo Kim,Soo Man Park,Hee Chun Lim 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.1
The asymmetric inner structure of a catalytic combustor causes wall cracking because of regional overheating. Thus, a symmetric shape is proposed in the present work and analyses of the computational fluid dynamics of the existing combustor and the proposed type have been performed. A simulation of the revised combustor without a swirl device revealed that the flow of gases is concentrated on the center of the combustor and only catalysts around the center are used. In the revised combustor with a swirl device, the overall temperatures were estimated to be uniform. However, near the swirl device, high temperature exceeding 1,700 K was measured. Therefore, a heatproof surface coating on the swirl device is necessary for protection of the material. At the initial start-up of the catalytic combustor, hydrogen and natural gas are used. When only natural gas is used, the simulation indicated that the gas does not burn in the revised combustor without a swirl device. However, in the combustor with the swirl device, methane of 34.8% volume burns in the simulation. On the other hand, when hydrogen and natural gas are burned together, methane of 91.7% volume burns in the simulation.