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ALC 축분 발효퇴비 시용 및 논오리 사육이 벼 수량 및 미질에 미치는 영향
김현오,이주열,박기선 ( Hyun Ho Kim,Joo Yeol Lee,Ki Sun Park ) 한국환경농학회 1998 한국환경농학회지 Vol.17 No.1
This experiment was conducted to find out the effects of fermented compost using cattle manure and Autoclaved Lightweight Concrete(ALC) waste and duck raising in rice growing paddy fields on growth and quality of rice. By application of fermented compost of cattle manure incoporated ALC waste with amount of 2,000㎏/10a, rice yield was reduced 2.9%, and 4.1% in 1,000㎏/10a of compost with raising ducks plots as compared with application of standard level of chemical fertilizer. The ratio of head rice was slightly high in plots of compost application and white-belly kemeled rice was reduced by application of 1,500∼2000㎏/10a compost. The ratio of Mg/K was the highest in application of 1,000㎏ compost with raising duck. Efficiency of weed control by raising duck with free hexbiades was suffiaent and their effects showed no difference between raising duck plots and herbidde plot.
김현오(Hyun Ho Kim),김규완(Kyu Wan Kim),조성현(Sung Hyun Cho),김대성(Day Sung Kim),김증호(Jeung Ho Kim),강성규(Seong Kyu Kang) 대한인간공학회 2008 大韓人間工學會誌 Vol.27 No.1
The purpose of this survey was to identify ergonomic risk factors of work-related musculoskeletal disorders (MSD) and understand the current MSD risk status in the wholesale/retail industry. The field survey was conducted at 120 wholesale/retail establishments, and the cause of MSD occurred from the national industrial accident statistics by the Ministry of Labor in 2006 was analyzed in terms of company size, a term of work, job title, and cause of occurrence. The numbers of disasters on MSD were 602 which were included 432 disasters who met with low back pain by incident. A checklist was developed by KOSHA to use for the field survey. A total of 419 tasks were identified at the 120 establishments surveyed. The highest frequency was Task 2(45%) which was mostly observed in repetitive work (e.g. displaying, scanning, cutting or wrapping of goods). The second and third were Task 9(34%) and Task 8(14%) which were identified in manual materials handling (e.g. lifting, lowering, carrying or stocking of goods). The results suggest that the three Tasks should be first considered for the control in wholesale/retail industry and that exposure to MSD risk factors in those Tasks should be primarily addressed in order to reduce MSD risk in that industry.
3 MW급 풍력발전 타워 플랜지 홀 배열에 따른 구조적 안전성에 관한 연구
김현오(Hyun-Oh Kim),이연호(Yeon-Ho Lee),허현도(Hyun-Do Huh),김윤제(Youn-Jea Kim) 대한기계학회 2018 大韓機械學會論文集B Vol.42 No.11
최근 화석연료의 대체 자원으로 떠오르는 신재생 에너지에 대한 관심이 급증하고 있다. 풍력발전은 신재생 에너지 개발 중 대표적인 사례로, 친환경적이며 발전 효율이 우수하여 수요가 증가하고 있다. 풍력발전의 수요가 급증하면서 에너지 발전량을 증가하기 위해 풍력터빈의 대형화가 이루어지고 있는 추세이다. 이러한 풍력터빈의 대형화는 설치 면적당 발전량과 발전 효율을 증가시켜 발전단가를 저감하는 효과가 있는 반면, 풍력터빈의 자체하중 및 풍하중을 증가시켜 구조적 안전성 문제를 초래한다. 본 연구에서는 유체-구조 연성해석 기법을 이용하여 풍력타워 및 타워 섹션을 지지하는 설계 요소인 플랜지의 구조적 건전성을 평가하였다. 특히, 형상 변수로 홀 배열 지름을 선정하였으며, 풍속 별 플랜지에 적용되는 등가응력을 산출하여 플랜지의 구조적 안전성을 고찰하였고 이를 기초로 플랜지 제작을 위한 기초자료를 확보하였다. Recently, interest in renewable energy, which is considered as an alternative resource for fossil fuels, has increased rapidly. In particular, wind power generation is a representative example of renewable energy development. Because wind power generation is environmentally friendly, there has been an increased demand for its installation. In addition, with this increased demand for wind power generation, the sizes of wind turbines need to be enlarged. This enlargement of the wind turbine would reduce the power generation cost by increasing the amount of power generated and power generation efficiency per unit installed area. However, such an increase in the size of wind turbines would increase the self-load and wind load applied to itself, thereby causing structural safety problems. In this study, the structural safety of the tower flange, which is a design element that supports wind towers and wind sections is evaluated using fluid-structure interaction (FSI) analysis. In particular, as the design parameter, the hole-array diameter of the tower flange is selected, and the equivalent stress applied by several wind speeds is calculated to evaluate structural safety. The results of the numerical analysis could be used for the manufacture of tower flange prototype model.
김성환(Kim Seong Hwan),김동호(Kim Dong Ho),김현오(Kim Hyun Oh),이봉학(Lee Bong Hak) 강원대학교 산업기술연구소 2003 産業技術硏究 Vol.23 No.1
The development and maintenance of a sound bond are essential requirements of concrete repair and replacement. The bond property of a overlay to its substrate concrete during the lifetime is one of the most important performance requirements which should be quantified. A standard or a verified bond strength measurement method is required at field for screening, selecting materials and quality control for overlay or repair materials, but no test method has been adopted as a standard. In this study, a concrete pull off bond strength measurement method for field application is proposed and evaluated. This study compares the splitting tensile test, slant shear test, nipple pipe direct tensile test, flexural adhesion test, briquette tensile test, jumbo nail pull-out test and core pull-off test with their test procedures. From these comparison and investigation, core pull-off test is selected as a main topic of this study because of it’s suitability for in situ testing, simplicities in field application and clearness at interface boundary condition. Thus, the proposed core pull off test is evaluated to be the most appropriate method for field application in a simple manner. The fracture surface and fracture mode could be easily determined by visual observation of failure surface of the field specimen. The core pull off test was found to be sensitive to surface condition and latex contents at latex modified concrete.
차량의 안정성을 고려한 In-Wheel 방식 연료전지 차량의 회생제동 알고리즘 개발
양동호(Dong ho Yang),서현재(Hyun Jae Seo),김현오(Hyoun Oh Kim),황성호(Sung-Ho Hwang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In these days, the research about hybrid and fuel cell electric vehicles is actively performed due to the environmental contamination and resource exhaust. Specially, the technology of regenerative braking, converting heat energy to electric energy, is one of the most effective technologies to improve fuel economy. This paper developed a regenerative braking control algorithm that is considered vehicle stability for fuel cell electric vehicles using in-wheel motors. The vehicle has a inline motor at front drive shaft and two in-wheel motors at rear wheels. A control logic and regenerative braking control algorithm are analysed by MATLAB/Simulink. The vehicle model is carried out by CarSim and the driving simulation is performed by using co-simulation of CarSim and MATLAB/Simulink. From the simulation results, a regenerative braking control algorithm is verified to improve the vehicle stability as well as fuel economy.
이영순,김광호,김현오,Lee, Young-Soon,Kim, Kwang-Ho,Kim, Hyun-Oh 한국영양학회 1979 Journal of Nutrition and Health Vol.12 No.1
The purpose of this study was to search for a mixture of stevioside and sucrose, the sweetness of which in soft drink such as cocoa and ginger tea were almost equal the sweetness of commomly used 7% sucrose in the drinks. Results obtained by the present experiment were as fellows: 1) Mixture of 50% stevioside 40mg (0.04%) (A) and 2.0% sucrose, 95% stevioside 40mg (0.04%) (B) and 1.0% sucrose, and 50% and 95% stevioside 60mg (0.06%) (A,B) respectively, the sweetness of which in ginger tea corresponded to that of reference in the drink. 2) Mixture of 50% stevioside 40mg (0.04%) (A) and 2.0% sucrose, 95% stevioside 20mg (0.02%) (B) and 2.0% sucrose, and 50% stevioside 40-60mg (0.04-0.06%) (A) and 95% stevioside 40-60mg (0.04-0.05%) (B), the sweetness of which in cocoa is equal to that of standard sucrose in the drink. 3) The mixture contains low energe, and also the after-taste of stevioside was not detected in the above drinks.
화강암 골재를 이용한 아스팔트 혼합물의 동탄성 계수 예측방정식
이관호(Lee Kwan-Ho),김현오(Kim Hyun-O),장민석(Jang Min-Seok) 대한토목학회 2006 대한토목학회논문집 D Vol.26 No.3D
본 연구에서는 화강암 골재를 이용한 아스팔트 표층용 혼합물 및 기층용 혼합물의 동탄성계수를 평가하고, 배합설계에 사용된 데이터를 바탕으로 신뢰성이 높고, 간단한 형태의 동탄성계수 예측방정식을 개발하는 목표를 두고 있다. 기존의 마샬 배합설계가 아닌 슈퍼페이브 배합설계를 이용하여, 재료들의 기본 물성치를 정리하였다. 표층용(13㎜ 및 19㎜)과 기층용 (25㎜) 밀입도 아스팔트 혼합물을 적용하였고, 국내의 대표적인 아스팔트 AP-3, AP-5 아스팔트 바인더를 이용하여 배합설계를 실시하였다. 최적아스팔트함량에 공극률 2%, 4%, 6%의 시편과 공극률 4%에 최적 아스팔트 함량에서 ±1%의 아스팔트 함량을 이용하여 시편을 제작하였다. 5개의 다른 시험온도, -10, 5, 21, 40, 55℃ 및 0.05, 0.1, 1, 10, 25㎐의 5개의 하중주파수를 이용하여 일축압축 시험모드로 동탄성 계수를 평가하였다. 기존의 동탄성계수 예측용 Witczak 방정식을 표층용 및 기층용 아스팔트 혼합물 실험결과를 이용하여 국내 아스팔트 혼합물에 적용할 수 있는 수정된 예측방정식을 제안하였다. 예측방정식에 사용된 각각의 변수들에 의한 영향정도를 상호 비교 평가하였고, 제한된 실험 자료로 인해 예측방정식의 신뢰도는 약 80% 수준으로 평가되었다. The presented work provided a predictive equation for dynamic modulus of hot mix asphalt, which showed higher reliability and more simplicity. Lots of test result by UTM at laboratory has been used to develop the precise predictive equation. Evaluation of dynamic modulus for 13㎜ and 19㎜ surface course and 25㎜ of base course of hot mix asphalt with granite aggregate and two asphalt binders (AP-3 and AP-5) were carried out. Superpave Level 1 Mix Design with gyrator compactor was adopted to determine the optimum asphalt binder content (OAC) and the measured ranges of OAC were between 5.1% and 5.4% for surface HMA, and around 4.2% for base HMA. The dynamic modulus and phase angle were determined by testing on UTM, with 5 different testing temperature (-10, 5, 20, 40, & 55℃) and 5 different loading frequencies (0.05, 0.1, 1, 10, 25 ㎐). Using the measured dynamic modulus and phase angle, the input parameters of Sigmoidal function equation to represent the master curve were determined and these will be adopted in FEM analysis for asphalt pavements. The effect of each parameter for equation has been compared. Due to the limitation of laboratory tests, the reliability of predictive equation for dynamic modulus is around 80%.