Friction Characteristics of Aluminized Polyester Fabric under Dry - and Water- Lubricated Conditions

JaeYoung Byun,Nicholas Nnaemeka Okechukwu,Eunsuk Lee,JinGyu Park,WonSik Choi 한국트라이볼로지학회 2019 한국윤활학회지(윤활학회지) Vol.35 No.6

Materials made from plastics are increasingly utilized in constructing greenhouses and setting up shield structures. Polyester fabrics have a wide range of use in horticulture and other fields of agriculture. They are utilized as a greenhouse cover and also help in combating intense climate variation in the field. Over time, these fabrics may experience friction against other surfaces. Owing to this, the surface framework of the material degenerates. This study examines the frictional characteristics of aluminized polyester fabric in both dry- and water-lubricated environments under changing applied loads and sliding speeds. Friction experiments are performed at room temperature by employing a pin on a disk. The experiments reveal that the friction coefficient decreases with increase in applied load in both dry sliding and water-lubricated environment. However, the friction coefficient decreases more under the water-lubricated setting than in the dry state. At the maximum applied load, the highest friction coefficient is discovered in the dry state with a range of 0.282 to 0.237, whereas a friction coefficient of 0.229 to 0.189 is observed in the water-lubricated state. Additionally, it is observed that the friction coefficient increases with an increase in sliding speed under both experimental environments. The examination of specimen surfaces reveals that the abrasion is minor in the water-lubricated setting compared with that in the dry state.

Comparison of Physicochemical Characteristics and Antioxidant Activities with Consumer Acceptance Test in Commercial Gochujang Products

Jaeyoung Byun,Haerim Park,Hyunjung Kang,Haeji Kim,Saebyeol Park,Hyemin Yoo,Jiwoo Lee,Ilsook Choi 동아시아식생활학회 2018 동아시아식생활학회 학술발표대회논문집 Vol.2018 No.6

Performance Evaluation of Boost Converter System based on Super-capacitor Module for Agricultural Electric Vehicle

( Jaeyoung Byun ),( Pandu Sandi Pratama ),( Eonuck Kang ),( Eunsuk Lee ),( Yeonho Jeon ),( Sungwon Chung ),( Wonsik Choi ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1

Electric vehicles carrier are increasingly used in many field such as industry, factories, marts, and leisure areas. It replaces the powertrain that have problems of noise and soot for transporting compost, fertilizer, seedlings and harvests required for field work. There are many benefits for women or aged farmers, and it is easy to add structures and functions according to the requirements of farmers. However, it mainly uses calcium battery which is the main power generating energy of electric car. Calcium batteries have a long charging time of more than 12 hours and battery life due to charging and discharging is limited to agricultural electric vehicle users working in the field. Therefore, in order to overcome this disadvantage, this study first investigated the stabilization of the output load in order to replace the calcium lead battery by using the super-capacitor. Bi-directional application technology used for charging and discharging, and boost DC / DC conversion technology to provide stable output of load generated by user's transportation of crops. The output was check to identify the unstable driving factors that can occur during operation. The power source used in this research is 6 cells 2.7V super-capacitor connected in series with total voltage 16.2V. The desired output voltage that should be maintained when the motor operate at nominal velocity is 12V. As a result, it was confirmed that the input voltage was constantly maintained at 12V even though the super-capacitor output voltage drop within the range of 5V to 16.2V. If the maximum current value up to 60A can be achieved while maintaining the output voltage at 12V, it can be concluded that the proposed system will be able to satisfy the output when driving the maximum carrying weight of 150Kg according to the loading of the electric transport vehicle.

Comparison of physicochemical characteristics and antioxidant activities with consumer acceptance test in commercial Doenjang products

Jaeyoung Byun,Haerim Park,Hyunjung Kang,Jiwoo Lee,Ilsook Choi 한국생활과학회 2018 한국생활과학회 학술대회 Vol.2018 No.5

Friction Characteristics of Aluminized Polyester Fabric under Dry - and Water- Lubricated Conditions

Byun, JaeYoung,Okechukwu, Nicholas Nnaemeka,Lee, Eunsuk,Park, JinGyu,Choi, WonSik Korean Tribology Society 2019 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.35 No.6

Materials made from plastics are increasingly utilized in constructing greenhouses and setting up shield structures. Polyester fabrics have a wide range of use in horticulture and other fields of agriculture. They are utilized as a greenhouse cover and also help in combating intense climate variation in the field. Over time, these fabrics may experience friction against other surfaces. Owing to this, the surface framework of the material degenerates. This study examines the frictional characteristics of aluminized polyester fabric in both dry- and water-lubricated environments under changing applied loads and sliding speeds. Friction experiments are performed at room temperature by employing a pin on a disk. The experiments reveal that the friction coefficient decreases with increase in applied load in both dry sliding and water-lubricated environment. However, the friction coefficient decreases more under the water-lubricated setting than in the dry state. At the maximum applied load, the highest friction coefficient is discovered in the dry state with a range of 0.282 to 0.237, whereas a friction coefficient of 0.229 to 0.189 is observed in the water-lubricated state. Additionally, it is observed that the friction coefficient increases with an increase in sliding speed under both experimental environments. The examination of specimen surfaces reveals that the abrasion is minor in the water-lubricated setting compared with that in the dry state.

Comparison of Physicochemical Characteristics and Antioxidant Activities with Consumer Acceptance Test in Commercial Gochujang Products

Jaeyoung Byun,Haerim Park,Hyunjung Kang,Haeji Kim,Saebyeol Park,Hyemin Yoo,Jiwoo Lee,Ilsook Choi 한국식생활문화학회 2018 한국식생활문화학회학술대회논문집 Vol.2018 No.06

IP Cluster 의 전도성 Noise 저감설계

변재영(Jaeyoung Byun) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5

Electromagnetic wave is widely used for IT industry such as wireless internet, broadcast network and mobile. And they require more elaborate and complicated device (PCB or Chip) than before, for meeting faster and more precise IT environment. But simultaneously, it causes Noise (Undesirable Electromagnetic wave), we should remove or reduce it for avoiding a false operation. There are two ways for understanding and handling Noise issue. First, EMI (Electromagnetic Interference) means noise emission level control under limited criteria with certain device. The other one, EMS (Electromagnetic Susceptibility), is under noise emission environment, a device could be designed for preventing false operation. Any system or module should be designed regarding to EMI and EMS conditions. In terms of EMI, it contains RE (Radiated Emission), CE (Conducted Emission). EMS perspective, it has RS (Radiated Susceptibility), ESD (Electrostatic Discharge) and CS (Conducted Susceptibility). Systematically, EMC (Electromagnetic Compatibility) condition have three kinds of part which are Noise source, Carrier path and Victim. If any part of them can be eliminated or controlled, EMC problem can be solved. Merely, most economical way for controlling EMC problem is thorough design for Noise source. This thesis is for researching to optimum PCB design of IP Cluster (Instrument Panel Cluster) which is one of essential module in automotive industry. One thing should be considered is that IP Cluster must be following a restricted package by vehicle manufacturer. Due to this restriction, this thesis is focusing on placement of key components on a restricted PCB circuit in stead of routing change for power line or signal line or adding filtering component. And CE (Conducted Emission) is chosen for a part of improvement in EMC.

Bifacial CdS/CdTe thin-film solar cells with copper nanowires as a transparent back contact

Byun, Eunkyo,Seo, Jaeyoung,Kim, Donghwan,Kim, Jihyun The Optical Society 2018 Optics express Vol.26 No.18

창업주기별 온라인 창업교육 콘텐츠 개발 및 운영현황 분석

변영조(Youngjo Byun),최종인(Jong-in Choi),김재영(Jaeyoung Kim) 한국인적자원개발학회 2018 한국인적자원개발학회 학술연구발표회 발표논문집 Vol.2018 No.12

우리나라 창업지원 사업의 구조는 2018년 7개의 정부부처가 27개의 산하 공공기관 등을 활용하여 61개의 사업에 약 7,800억 원의 예산을 투입하였다. 거대한 규모의 예산은 창업교육, 멘토링, 사업화, 연구개발(R&D), 행사네트워크, 창업지원 인프라 등을 구축하는데 활용되었다. 창업지원 예산은 창업의 생태계 관점에서 창업준비((0~1년 이내), 창업실행(3년 이내), 도약(4~7년), 재도전 단계 등으로 구분하여 배열해 본 결과 실행 및 도약단계가 가장 많은 예산(6,505억원)이 배정되어 있었다. 지원내용별로 분류를 해 본 결과 61개 사업 중 가장 많은 부분을 차지하고 있는 것은 창업교육 분야로 61개 지원사업 중 32개 지원사업 내 창업교육 프로그램이 포함되어 있었다. 이처럼 창업의 전주기에 걸쳐 중요한 요소인 창업교육 분야에 있어 초중고, 대학, 일반인까지 포괄하여 교육실행이 가능한 것이 온라인 교육이다. 본 연구에서 오프라인 교육으로는 33개 창업선도대학의 창업교과목 분석과 온라인과정으로는 중소벤처기업부의 창업에듀의 179개 콘텐츠의 창업주기별, 역량별 과목 개발현황 및 분포등을 조사분석 하였다. 조사방법은 콘텐츠를 구성하고 있는 교과목명과 과정의 설명 등을 바탕으로 창업주기 및 역량별로 키워드를 도출하여 그 분포현황을 조사하였다. 분석결과 오프라인 강좌에 비하여 온라인 강좌가 역량별로 세분화되어 과정이 분포 되어있었으나 약30%에 해당하는 52건의 교과가 단순한 슬라이드 교육자료가 업로드 되어있어 교육의 질적 제고를 위한 콘텐츠 개발 확충이 필요하였고 창업주기 부분에서는 도약기와 재도전 단계의 창업콘텐츠가 부족함을 확인 할 수 있었다. 창업교육의 중요성은 날로 증대되고 있고 산업의 발전은 가속화 되고 있다. 따라서 효과적인 창업 교육을 위해 온라인 교육은 매우 효과적인 교육방법이며 이의 발전을 위해 창업교과의 확충, 창업콘텐츠를 개발 및 운영할 수 있는 교원에 대한 교육프로그램, 효과적인 창업교과를 위한 교수학습 방법에 대한 연구 등이 지속적으로 필요하다. The structure of Korea’s Startup support programs was to invest about 780 billion won in 61 programs, using 27 government funded agencies. The huge budget was used to build foundation education, mentor programs, commercialization, R&D, Startup Festivals, and start-up support infrastructure. According to the classification by application, the largest portion of 61 projects were supported to startup education. Online education is an important element of start-up education, which includes elementary, middle and high schools, and universities. In this study, an analysis of online courses investigated the start-up of 179 contents by the start-up period of the small and medium venture business department, and the distribution status. The survey method elicited keyword for each start-up cycle and capability based on description of the curriculum and the educational purpose of organizing the contents, and investigated the distribution status. According to the survey, additional online contents need to be developed. It is necessary to analyze the capabilities of entrepreneurs and develop contents and teaching models according to their entrepreneurial capabilities. The importance of start-up education is increasing and industrial development is accelerating. Therefore, for effective start-up education, online education is a very effective method of education, and it is necessary to expand the start-up course, to develop and operate the start-up contents, and to continuously study the teaching methods for effective start-up curriculum.

메타버스를 활용한 기업연계 창업교육 표준모형 수립

변영조(Youngjo Byun),김재영(Jaeyoung Kim) 표준인증안전학회 2023 표준인증안전학회지 Vol.13 No.2