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鄭健龍,李暎浩 충남대학교 교육대학원 1983 碩士學位論文集 Vol.1 No.-
In this study we have derived the following conclusions from the mechanical property tests(such as tensile test, impact test, and hardness test) and microscopic examination of the structure of the welded joint after manual are welding of black heart malleable cast iron by using nickel type electrode and low hydrogen type electrode: 1. The tensile strength of the base metal in post-heat treatment and the welded joint by using nickel type electrode and low hydrogen electrode somewhat decreased compared with the base metal, 13% in case of using N rod and 16% in case of L rod. Also the elongation decreased by 6.5% in the case of the base metal in post-heat treatment, 32.6% in case of N rod and 42.4% in case of L rod compared with base metal. 2. The impact value of the base metal in post-heat treatment decreased by 12% compared with base metal, while in the cases of both N rod and L rod it increased by 160% and 400% respectively. 3. The hardness increased in all the cases compared with the base metal (H_RB 61.2%) and the maximum increases of hardness was by 60% in case of NA air-cooled after welding. 56% in case of NH in post-heat treatment, 77% in case of LA and 72% in case of LH. 4. The examination of the microscopic structure of welded joint shows no big difference between the case in which L rod was used and the case in which N rod was used, and in both cases of L and N the Ledeburite and Martensite structure found in other cast iron welding joints much decreased in the structure of the welded joint, especially in the heat affected zone and fusion line, after post-heat treatment. 5. Judging from the above mentioned results, the mechanical properties of the expensive N rod is generally more excellent than L rod. But the welding by using L rod can bring about excellent properties of welded joints when we consider the improvement of welding condition and the process of manufacturing after welding because in case of using L rod the color matching of deposited metal is better than in case of using N rod.
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정건용,조영수,김종표 한국막학회 2006 멤브레인 Vol.16 No.1
본 연구는 침지형 분리막 모듈에 자체 설계한 회전원판을 적용하여 운전시간 경과에 따른 막오염 감소효과와 최적의 운전조건을 투과실험으로 알아보았다. 원료용액으로는 kaolin과 bentonite를 농도별로 제조하여 사용하였고, 원판의 회전수를 120 rpm까지 변화시키면서 60분 동안 실험하였다. 회전원판에 의한 막오염 감소 효과로 kaolin 수용액을 대상으로 한 실험에서는 흡입압력이 약 28%까지 감소하였다. 또한 kaolin 농도에 따라서 최적 투과유속이 감소하였으며 0.4wt% 일 경우는 60 내지 70 LMH가 적당하였다. Bentonite 수용액에 대하여 투과유속이 30 LMH 일 경우에 원판의 회전속도가 80 rpm 이상이 되면 흡입압력이 대략 0 mmHg에 접근하였다. The permeation experiments were carried out for the submerged membrane module equipped with self-designed rotating disks in order to determine the effect of fouling reduction and the optimum operating conditions as a function of operating time. Kaolin and bentonite particles were used to prepare various concentrations of feed solution. Every experiment was continued until 60 minutes at various rotating disk speeds up to 120 rpm. The suction pressure for kaolin solutions decreased to 28% by using rotating disk to decrease the fouling. Also, the optimum permeation flux decreased as kaolin concentration increased, and became 60 to 70 LMH for 0.4 wt% of kaolin solution. The suction pressure for bentonite experiment approached to 0 mmHg at 30 LMH and above 80 rpm rotating disk speed.
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정건용,최정규 한국막학회 2009 멤브레인 Vol.19 No.4
공칭 세공크기 0.1 μm이고 내경이 5 mm인 정밀여과용 관형 분리막 내에 자체 설계한 배출봉을 삽입하여 막오염 감소효과에 따른 투과유속을 측정하였다. 원료용액으로는 에멀젼 상태의 dioctyl tinoxide (DOTO) 입자를 사용하였으며 0.5 wt%까지 농도를 변화시키면서 1.6 bar 이내에서 운전하였다. 배출봉의 효과는 매 실험마다 배출봉을 삽입한 경우와 사용하지 않은 경우의 투과유속을 비교하여 평가하였다. 배출봉을 사용할 경우 운전압력 1.6 bar에서 최대 20%의 투과유속이 향상되었다. 또한 DOTO 농도가 증가함에 따라서 배출봉에 의한 투과유속 향상효과는 크게 나타났으며 0.5 wt% 농도에서 43%까지 투과유속이 향상되었다. The permeation experiments were carried out for the nominal pore size 0.1 μm and 5 mm inner diameter microfiltration tubular membrane equipped with self-designed discharging rod in order to determine the effect of fouling reduction. Dioctyl tinoxide (DOTO) latex particle was used to prepare up to 0.5 wt% concentration of feed solution, and the experiments were operated within 1.6 bar. The permeation flux effect on the discharged rod was measured as a result of flux comparison between the cases of equipped and non-equipped discharge rod modules for every experiment. The permeation flux for the case using the discharged rod was enhanced to 20% at 1.6 bar operating pressure. The improvement on permeation flux for using the discharged rod was greater as the concentration of feed increased, and reached up to 43% under 0.5 wt% concentration of feed solution.
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정건용,박미자 한국막학회 2017 멤브레인 Vol.27 No.1
The air injection nozzle tube was inserted inside of the tubular membrane module to reduce membrane fouling and improve the permeate flux. The average pore size of membrane was 0.1 μm and the yeast was used as a foulant. All of permeate experiments were started without air injection for the module equipped with the nozzle tube, then carried out continuously with air injection. Finally, the nozzle tube was removed from the module and the permeate was measured without air injection. The measured permeate fluxes were compared to examine the effect of air injection. The fluxes for air injection were consistently maintained or increased. The fluxes of no-air injection with the nozzle tube were greater than those of the empty tubular module. As operating pressure decreased to 0.4 bar, the flux enhancement of air injection based on no-nozzle case increased to 21%. Flux enhancements of air injection were above 30% as the gas/liquid two-phase flow was changed from the stratified-smooth to the intermittent pattern due to increase of gas flowrate.
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공예문화산업클러스터 조성요인에 대한 인식도 조사 연구 - 호남권을 중심으로 -
정건용 사단법인 한국조형디자인협회 2011 조형디자인연구 Vol.14 No.3
본 연구는 서울/수도권을 제외하고 호남권이 공예문화산업클러스터를 조성하는데 경쟁력이 있는 것으로 기초조사 됨에 따라, 호남권을 중심으로 전문가 집단이 인식하고 있는 공예문화산업클러스터 조성요인에 대한 중요성과 그에 따른 집단별 차이점을 조사․분석하여 시사점을 도출하는 것을 목적으로 하였다. M. Porter가 주장하는 다이아몬드모델을 통해 조사․분석한 결과, 요소조건에 대한 환경조건 중 ‘공예문화상품 판매를 위한 유통시스템 구축’이 가장 중요하게 인식하고 있는 것으로 최종 조사 분석되었다. 따라서 호남권 공예문화산업클러스터 조성방안은 우선, 공예문화상품 판매를 위한 유통시스템 구축을 위해 지역 내 공예문화상품 제조기업을 중심으로 비즈니스 기능을 강화할 수 있도록 특화기업으로 성장을 유도하고, 원활한 원재료 확보를 위해 소재별 국내․외 네트워크 구축 및 유통 전문기업을 유치해야 할 것이다.
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