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Quantum Dot LED를 이용한 상추 주요 병원성 곰팡이 및 세균의 생장억제효과 기내실험
이현구(Hyun-Goo Lee),김상우(Sang-Woo Kim),마헤시 아드히카리(Mahesh Adhikari),순 쿠말 구룽(Sun Kumar Gurung),세투 바지에(Setu Bazie),산 꼬설(San Kosol),권병헌(Byeong-Heon Gwon),주한준(Han-Jun Ju),고영욱(Young-Wook Ko),김용득(Yong-Duk Kim),유 한국식물병리학회 2019 식물병연구 Vol.25 No.3
QD LED has an ideal light source for growing crops and can also be used to control plant pathogenic microorganisms. The mycelial growth inhibition effect of QD LED light on Rhizoctonia solani, Phytophthora drechsleri, Sclerotinia sclerotiorum, Sclerotinia minor, Botrytis cinerea, Fusarium oxysporum, Pectobacterium carotovorum, and Xanthomonas campestris were investigated. According to the results, BLUE (450 nm) light, suppressed S. sclerotiorum by 16.7% at 50 cm height from the light source, and 94.1% mycelial growth at 30 cm height. Mycelial growth of Sclerotinia minor was inhibited by 80.4% at 50 cm height and 36.3% at 50 cm height in B. cinerea. S. minor, and B. cinerea was inhibited by 100% mycelial growth at a height of 30 cm from the light source. At 15 cm height, all three pathogens (B. cinerea, S. minor, and S. sclerotiorum) was inhibited by 100%. QD RED (M1) and QD RED (M2) light suppressed mycelial growth of S. minor and B. cinerea by 100% at 30 cm and 15 cm height from the light source. For S. sclerotiorum, QD RED (M1) and QD RED (M2) showed 75.2% and 100% inhibition, respectively. Further experiment was conducted to know the suppression effect of lights after inoculating the fungal pathogens on lettuce crop. According to the results, QD RED (M2) suppressed the S. sclerotiorum by 59.9%. In addition, Blue (450 nm), QD RED (M1), and QD RED (M2) light reduce the infestation by 59.9%. In case of B. cinerea, disease reduction was found 84% by BLUE (450 nm) light. Results suggest that the growth inhibition of mycelium increases by Quantum dot LED light.
뇌하수체졸중 환자에서 나타난 안검하수를 동반한 고립된 제 3 뇌신경 마비 -증례보고-
이현구 ( Hyun Goo Lee ),노재섭 ( Jae Sub Noh ),임종국 ( Jong Kook Rhim ),정봉섭 ( Bong Sub Chung ) 대한뇌종양학회·대한신경종양학회·대한소아뇌종양학회 2011 대한뇌종양학회지 Vol.10 No.1
Pituitary apoplexy is an acute ischemic or hemorrhagic vascular accident of a pituitary adenoma. Clinical features of pituitary apoplexy include sudden onset of headache, nausea, vomiting, visual symptoms, ptosis, altered mental status, and endocrinologic dysfunction. However, isolated third cranial nerve palsy with ptosis as the presenting sign of pituitary apoplexy is very rare. We describe one case of pituitary apoplexy presenting as sudden-onset unilateral ptosis and diplopia. So we suggest that pituitary apoplexy should be included in the differential diagnosis of patients presenting with isolated third cranial nerve palsy with ptosis and recommend that early surgical decompression should be considered for preservation of third cranial nerve.
자기장이 인가된 영역에서의 층류 충돌제트의 열전달특성 변화에 대한 수치적 연구
이현구(Hyun Goo Lee),하만영(Man Yeong Ha),윤현식(Hyun Sik Yoon),전호환(Ho Hwan Chun) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The laminar impinging jet thermal fields were investigated with or without magnetic fields. The transient phenomenon from steady to unsteady flow was founded at specific Reynolds number ranges. In unsteady flow region, the magnetic fields make flow stable. So the characteristics of heat transfer at impingement wall are changed
이현구(Lee Hyun-Goo),하태현(Ha Tae-Hyun),정호성(Jung Ho-Sung),한문섭(Han Moon-Sub),배정효(Bae Jeong-Hyo) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Corrosion of metallic structures arises when an electric current flows from the metal into the electrolyte such as soil and water. The potential difference across the metal-electrolyte interface, the driving force for the corrosion current, can emerge due to a variety of temperature, pH, humidity and resistivity etc.. With respect to a given structure, a stray current is to be defined as a current flowing on a structure that is not part of the intended electrical circuit. Stray currents are caused by other cathodic protection installations, grounding systems and welding posts, referred to as steady state stray currents. But most often traction systems like railroads and tramlines are responsible for large dynamic stray currents. This type of stray current is generally results from the leakage of return currents from large DC traction systems that are grounded or have a bad earth-insulated return path. This paper investigates the reports, which is made for protecting the electrical corrosion by the DC traction stray current before the construction period.
이현구(Hyun Goo Lee),하태현(Tae Hyun Ha),최정희(Jeong Hee Choi),정호성(Ho Sung Jung),배정효(Jeong Hyo Bae) 한국가스학회 2009 한국가스학회지 Vol.13 No.2
누설전류는 의도된 회로 이외의 경로로 흐르는 전류를 말하며, 일반적으로 도시철도의 급전 시스템은 레일을 부극선으로 사용하기 때문에 레일이 대지와 완벽하게 절연되어 있지 않다면 레일을 통해 흐르는 전류의 일부는 누설전류로 땅속을 흐르게 된다. 이때 토양을 통해 누설전류가 유출되는 레일과 지하매설 금속구조물에서 전식이 발생하게 된다. 본 논문에서는 국내 도시철도 운행지역 인근 지하매설 금속구조물의 전식방지 현황을 설문조사를 통하여 조사하였다. With respect to a given structure, a stray current is to be defined as a current flowing on a structure that is not part of the intended electrical circuit. Most often DC-powered traction systems like railroads and tramlines are responsible for large dynamic stray currents. This type of stray current is generally results from the leakage of return currents from large DC traction systems that are grounded or have a bad earth-insulated return path. At the place where the current leaves the rail and metallic structures, electrolytic corrosion may take place. This paper investigates the domestic conditions on the electrolytic corrosion protection of buried metallic structures adjacent to DC traction systems by survey.
이현구(Hyun-Goo Lee),손홍관(Hong-Kwan Sohn),하태현(Tae-Hyun Ha),배정효(Jeong-Hyo Bae),김대경(Dae-Kyeong Kim),이성준(Sung-Joon Lee),김성철(Sung-Cheol Kim) 대한전기학회 2011 대한전기학회 학술대회 논문집 Vol.2011 No.10
The increase in oil prices and the rising environmental concerns are boost the electric vehicle supply. Vehicle manufactures understand this trend quite well and plan to increase the production of electric vehicle(EV) such as Nissan LEAF and GM VOLT etc.. The growth of intermittent renewable energy sources such as solar and wind power requires utilities to find additional grid coupled energy storage and regulation capacity. EVs have a battery pack and a charger. The charger can be able to deliver power back to the grid from the vehicle's battery as well as charge the battery. The concept of deploying EVs to stabilize the electric power grid is generally referred to as Vehicle-to-Grid(V2G). We present the development status of V2G system.
자기장이 인가된 영역에서의 층류 충돌제트의 유동특성 변화에 대한 수치적 연구
이현구(Hyun Goo Lee),하만영(Man Yeong Ha),윤현식(Hyun Sik Yoon),전호환(Ho Hwan Chun) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The laminar impinging jet flow fields were investigated with or without magnetic fields. The transient phenomenon from steady to unsteady flow was founded at specific Reynolds number ranges. In unsteady flow region, the magnetic fields make flow stable. So the characteristics of fluid flow at impingement wall are changed.
온라인 잡지의 편집 유형에 따른 독자 태도의 차이에 대한 연구
이현구 ( Lee Hyun Goo ),김진희 ( Kim Jin Hee ),이철영 ( Lee Chull Young ) 한국기초조형학회 2018 기초조형학연구 Vol.19 No.1
잡지의 디자인은 판형, 종이의 종류와 같은 하드웨어적 형태와 그리드, 타이포그래피, 사진 및 일러스트레이션 등의 소프트웨어적 형태의 크리에이티브 요소를 통해 디자인 정체성을 형성한다. 미디어의 디지털화가 진행되고 개인 미디어가 성장하면서 인쇄 매체 중심으로 콘텐츠를 제공하던 잡지 역시 디지털 미디어로의 확장을 시도하고 있다. 그러나 이 과정에서 종이 책의 형태로 출간되는 잡지 매체의 편집 디자인을 통한 정체성이 디지털 언어로 출력되는 온라인 매체의 잡지와 정체성을 공유하지 못한 채 같은 콘텐츠를 다른 형태의 편집디자인 요소를 통해 표현하고 있는 실정이다. 이에 본 연구에서는 오프라인 잡지가 온라인화 되는 과정에서 이러한 편집디자인 요소에 따라 독자들의 태도가 어떻게 달라지는가를 실증 연구를 통해 확인해보고자 하였다. 이를 위해 현재 출판되고 있는 패션 잡지를 선정하여 인쇄 잡지의 편집 디자인 구성 요소들을 적극적으로 반영한 온라인 가로형 편집 디자인과 인쇄 잡지의 편집 디자인 요소들이 거의 반영되지 않은 채 현채 실행되고 있는 온라인 세로형 편집 디자인을 실험 자극물로 제작하여 서울 및 수도권에 거주하는 20대 남녀 160명을 대상으로 실험연구를 진행하였다. 분석결과 첫째, 가로형 편집 디자인이 세로형 편집 디자인보다 주목성이 높고 가독성도 좋은 것으로 나타났다. 둘째, 독자들의 태도는 세로형 편집 디자인보다 가로형 편집 디자인에 더 호의적인 것으로 나타났으며, 구독 의향도 가로형 편집 디자인이 더 높은 것으로 나타났다. 이러한 연구를 통해 통합 미디어, 멀티 플랫폼 시대에 미디어의 브랜드 자산을 확보하고 디자인 아이덴티티를 형성하기 위한 연구에 도움이 될 수 있을 것으로 기대한다. The design identity of a magazine is formed with such creative elements as hardware (e.g. size and paper type, and software (e.g. grid, typography, photography, and illustration). As media has been digitalized and personal media has grown, a magazine whose contents have been mainly provided on print media is also trying to seek its expansion into the digital world. In the process of expansion, however, a magazine, whose identity is established through the editing design of the medium that is published in the form of a paper book, does not share that of an online magazine but only express it with other editing design elements for the same contents. In this respect, we attempted to examine how readers' attitude toward an online magazine is affected by editing design element in the process where an offline magazine transforms into an online magazine. To attain the objective, we selected fashion magazines that are currently in the press. And we made as experimental stimuli (i) an online magazine in horizontal layout design, which actively adopted the editing design elements of a print magazine, and (ii) an online magazine in vertical layout design, which hardly adopts the editing design elements of a print magazine. And we conducted an experiment with 160 participants (both men and women) in their 20s, living in Seoul and the metropolitan area. The findings are as follows. First, we found that the online magazine in a vertical layout design had higher attention rate and readability than that in a horizontal layout design. Second, we came to know that readers had a more favorable attitude toward the online magazine in a horizontal layout design than that in a vertical layout design. Intention to purchase was also higher for the online magazine in a horizontal layout design. We expect that these results will be helpful for a study aiming to secure media brand assets and form design identify in the era of integrated media and multi-platform.