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정민호,양상민,이호형 한국유체기계학회 2005 한국유체기계학회 논문집 Vol.8 No.4
Although the globe is the most typical valve to control high pressure drop in piping system, it is very hard to figure out the characteristics of flow field in the globe valve caused by its complex geometry. So there is very few studies to find out flow characteristics of globe valve. In this study, numerical analysis for flow field in the globe valve is carried out using the FLUENT code which is commercial CFD program. Pressure drop through the globe valve is also measured to verify the results come from numerical analysis. Comparing experiment with numerical analysis, two results are very close to each other.
정민호,최은석,이건학,김진오,김아성,천성우,임채현,이승백 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.52
We report on the dependence of the reduced metallic percolation paths of single-wall carbonnanotube-network thin-films (SCNTFs) on the channel aspect ratio and the number of strips (N_(strip)). A longer channel length (L_C) and the existence of strips in the channel region limit the number of metallic percolation conducting paths existing between the source and the drain in SCNTF transistors. Increasing the channel aspect ratio threefold resulted in an increase in the on/off current ratio (I_(on)/I_(off)) by 246%. We also observed that introducing 15 strips into the channel increased I_(on)/I_(off) by 859%, which was attributed to a reduction in the number of metallic percolation paths formed between the source and the drain. The results show that with a higher aspect ratio and with strips introduced into the channels, the semiconducting behavior of solution-processed SCNTF transistors can be enhanced.
정민호,이수민,장경애,김자희 대한산업공학회 2017 대한산업공학회 춘계학술대회논문집 Vol.2017 No.4
오늘날 기업은 동시다발적으로 정보시스템 개발을 진행하고 있으며, 시스템의 개발 비용과 고객의 만족도를 높이기 위해선 고품질의 데이터 품질이 요구된다. 데이터 품질을 높이기 위해선 가장 먼저 데이터 표준화가 이루어 져야한다. 따라서 본 논문에서는 동시다발적으로 개발이 이루어지는 정보시스템의 데이터를 표준으로 관리할 수 있는 시스템을 제안한다.
정민호,이수민,장경애,김자희 한국경영과학회 2017 한국경영과학회 학술대회논문집 Vol.2017 No.4
오늘날 기업은 동시다발적으로 정보시스템 개발을 진행하고 있으며, 시스템의 개발 비용과 고객의 만족도를 높이기 위해선 고품질의 데이터 품질이 요구된다. 데이터 품질을 높이기 위해선 가장 먼저 데이터 표준화가 이루어 져야한다. 따라서 본 논문에서는 동시다발적으로 개발이 이루어지는 정보시스템의 데이터를 표준으로 관리할 수 있는 시스템을 제안한다.
정민호,손정화,조기호,문상관,권승원,정우상,Jung, Min-ho,Son, Jeong-hwa,Cho, Ki-ho,Mun, Sang-kwan,Kwon, Seung-won,Jung, Woo-sang 대한한방내과학회 2017 大韓韓方內科學會誌 Vol.38 No.2
In this study, a 54-year-old female woman diagnosed as Multiple System Atrophy (MSA) presented diplopia with other symptoms - gait disturbance, ataxia, sleep apnea, dysuria. She had been cared with Korean medical treatment - Herbal medicine, acupuncture, bee venom acupuncture, electroacupuncture, cupping, moxa. Notable improvement was observed in diplopia expressing time and Unified Multiple System Atrophy Rating Scale (UMSARS). For MSA patient with no typical treatment indispensable, Korean medical treatment may be effective.
정민호,강기원,황택성 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
In this study, it was to develop an industrial type CDI module and to evaluate the performance of the module for brackish water desalination. Electrodialysis (ED) was an interesting technique developed for recovering and purifying salts and acids from fermentation broths. But ED process uses the chemicals; HCl, etc. Hence, in this system was using chemical free process. Because bipolar membrane (BPM) was used in the ED process. BPM has function at a constant voltage to split water into hydrogen ions and hydroxyl ions. And then this process was in need of hydrogen ion for recovery lithium ion from Lithium manganese oxide (LMO). So in this study was observed the effect of the voltage on the hydrogen ion concentration.
정민호,강기원,황택성 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
In this study, It was prepared that adsorption and desorption was possible composite membrane in order to recover the lithium. The composite membranes were prepared by coating bipolar membrane with PVDF. The Coating process was by using phase inversion. After PVDF was dissolved in DMF, slurry was made with LMO. And then, to improve conductivity of PVDF ion exchange resin or active carbon was investigated for comparison. Adsorption and desorption performance according to the ratio of the LMO with ion exchange resins or LMO with active carbon was tested by comparing the CDI module. CDI test of adsorption and desorption rate was that LMO : ion exchange resin ratio 65:35 wt% showed a maximum value.
Polyvinylidene Fluoride (PVDF) 양이온 불균질막 제조 및 이온선택 흡착 특성
정민호,고대영,황택성 한국막학회 2015 멤브레인 Vol.25 No.5
The study was evaluated and compared to commercial heterogeneous membrane in order to make cation exchange membrane set up the optimal preparing condition. The research findings show that ion exchange resin was added more than 40 wt% in order to show chemical properties of HPVDF higher than commercial heterogeneous membrane. But ion exchange resin was added less than 40 wt% in order to show mechanical properties of HPVDF higher than commercial heterogeneous membrane. According to conditions above, Electrical resistance was 1.83 Ω⋅cm-1, water uptake was 79%, ion exchange capacity was 1.60 meq/g, and burst strength was 0.97 MPa. Also The TDS remove efficiency was measured by approximately 40%. 이 연구는 양이온 불균질막을 제조하기 위해 PVdF와 상용 양이온교환수지를 배합하여 제조하고 최적의 조건제시및 기존 상용화막과 비교 평가하였다. 연구결과 불균질막이 기존의 상용화막보다 이온교환용량, 전기저항, 함수율 부분에서높은 물성을 나타내기 위해서는 이온교환수지의 무게 비율을 40% 이상 첨가해야 한다는 것을 확인하였다. 인장강도가 상용화막보다 높기 위해서는 이온교환수지의 무게 비율을 50% 이하로 첨가해야 한다는 것을 확인하였다. 따라서 화학적 특성과 기계적 특성을 고려했을 때, PVdF와 이온교환분말의 최적 비율은 60 : 40이며, 이때의 전기저항 1.82 Ω⋅cm-1, 함수율 79%, 이온교환용량 1.60 meq/g으로 측정되었고 기계적 강도는 0.97 MPa로 측정되었다. 이때, TDS 제거율은 약 40%로 측정되었다.