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강종우,전용우,한진영 한국폐기물자원순환학회 2013 한국폐기물자원순환학회 학술대회 Vol.2013 No.2
최근 하수슬러지의 고형연료화와 관련하여 건조 기술에 대한 관심이 높아지고 있다. 현재 산업용 건조 기술에는 여러 가지가 있으나, 일반적으로 대류 열전달 방법인 열풍 건조가 많이 이용되고 있다. 그러나 열풍 건조는 유지 관리 비용이 크며, 외부 조건에 영향을 받는 등의 운전상 어려움이 있다. 이에 비해 마이크로파 건조는 복사에 의한 내부가열 방식으로 건조시간을 단축시킬 수 있으며, 에너지효율 면에서도 뛰어나다. 그러나 국내에서는 적용 실적 및 성공 사례의 부족으로 인해 활용되지 못하고 있는 실정이다. Batch type의 lab-scale 1 ~ 4kW급 마이크로파 건조기를 사용하였으며, 하수슬러지 건조 시 피건조물의 최적 투입 두께는 2 cm 이하, 마이크로파의 최적 조사 높이는 조사너비의 70%로 도출되었다. 건조효율 평가를 위하여 2.4 kW급 열풍 건조기를 이용하여 비교 실험을 진행한 결과, 열풍 건조에 비해 마이크로파 건조가 동일 조건 하에서 건조시간은 2.7배 단축되었으며, 수분증발효율은 4배 높은 것으로 나타났다. 특히 수분함량 60 ~ 10% 구간의 수분증발효율은 마이크로파가 열풍보다 약 6배 높은 것으로 나타났으며, 피건조물의 초기 수분함량이 낮을수록 마이크로파 건조가 더 유리한 것을 확인하였다.
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강종우,백정흠,서동훈,박정호,김동휘,박종웅 대한수부외과학회 2019 대한수부외과학회지 Vol.24 No.3
Peripheral nerve torsion is a rare cause of peripheral nerve palsy and its etiology is also unknown. It is usually misdiag-nosed as compressive neuropathy or radiculopathy of spine though the treatment and clinical result are different from them. Authors present a case of radial nerve torsion. The symptom was same with a posterior interosseous nerve syn-drome. However, the lesion is located not at forearm but at arm. 말초 신경 염전(peripheral nerve torsion)은 말초 신경 마비(peripheral nerve palsy)를 발생시키는 드문 질환으로 그 발생 원인도 아직 알려진 바 없다. 말초 신경 염전은 보통 압박성 신경 병증(compressive neuropathy)이나 척추 신경근 병증(radiculopathy)으로 잘못 진단되는 경우가 많으며 그 치료 및 결과도 다르다. 저자들은 상완부(arm)에서 요골 신경 염전이 발생하였으나 신경 증상으로 수지 하수(finger drop)만 발생하여 후골간 신경 증후군(posterior interosseous nerve syndrome)으로 오인되었던 요골 신경 염전 증례를 보고하는 바이다.
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CFD 해석을 통한 임펠러 형상에 따른 인라인 믹서의 혼화 특성 비교
강종우,전용우,이동훈 한국폐기물자원순환학회 2013 한국폐기물자원순환학회지 Vol.30 No.7
Inline mixer, mixing device combined mechanical and hydraulic mixing, has been demonstrated many times to be effective in mixing process for coagulation. But most of inline mixer are difficult to utilize in relevant domestic industry since it is a foreign technology. So the development of domestic inline mixer is strongly needed. In this study, we compared mixing characteristics through computational fluid dynamics(CFD) analysis with different shape of impeller for the development of domestic inline mixer. The shape of the flow field by velocity vectors and the concentration distribution of injected coagulant were analyzed for comparison of the results. We chose two shapes of impeller(plate and screw), the CFD analysis for them was conducted to simulate actual field conditions. The screw-shaped impeller showed more well-mixing characteristics than the plate-shaped impeller from the results. On the other hand, short-circuiting flow could occur when the shape of impeller was plate.
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주관증후군의 치료를 위한 국소 스테로이드 주사 요법의 효과
강종우,박종웅 대한근전도전기진단의학회 2016 대한근전도 전기진단의학회지 Vol.18 No.2
Local steroid injection has been shown to be effective in carpal tunnel syndrome at least temporarily and it is also being attempted for conservative treatment of cubital tunnel syndrome recently. However local steroid injection may be effective in reducing nerve inflammation and edema caused by local compression in nerve entrapment syndromes theoretically, hasty conclusions should not be made about effect of local steroid injection in cubital tunnel syndrome because of many differences between carpal and cubital tunnel syndrome in etiopathogenic mechanism and pathophysiology. If local steroid injection is effective in cubital tunnel syndrome, it must be only temporary effect. Moreover, repeated steroid injection can induce adverse effect of nerve atrophy or degenerative change and it can drive patients defer their surgical decompression. Therefore it should be conducted carefully and limitedly in case of ulnar neuritis and mild cubital tunnel syndrome with short symptom duration for temporary relief of symptoms.
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Tariff barriers and industrial spillover effects
강종우,Suzette Dagli 한국무역학회 2018 Journal of Korea trade Vol.22 No.3
Purpose – The purpose of this paper is to demonstrate that higher tariffs under protectionism will have significant indirect impact through industrial forward and backward linkages, causing greater economic losses to tariff-imposing economies than to exporting countries. Design/methodology/approach – The authors use partial equilibrium analysis based on unique multiregional input-output (IO) data in measuring the second-round spillover effects of higher tariffs, also investigating the scenario of plausible substitutability across import sources as well as sectors based on historical import intensity data. Findings – Higher tariffs do not only have a direct impact, but also a significant indirect impact—through forward and backward linkages. Indirect effects can be extensive across economies and sectors—both in forward and backward linkages such as in transport—when value chains are longer and more complex. When possible substitution effects between different import sources and sectors are considered, negative forward linkage effects can be smaller, while negative backward linkage effects become more pronounced. Nevertheless, both negative effects are still found to be much bigger in indirect impacts compared with direct impacts. Research limitations/implications – This implies that higher tariffs, including administrative trade measures such as anti-dumping duties and countervailing duties could ironically entail rather greater negative impact on the tariff-imposing importing economies by damaging their exports of domestic sectors using the targeted imports as intermediate inputs, which could be severe if the importing sector has a long value chain in particular through deep forward linkages. Originality/value – This paper uses unique multi-regional IO data covering 45 economies’ 35 sectors in analyzing the second-round spillover effects across countries and sectors and employs comparative statics under different scenarios.
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