http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
전력케이블용 친환경 반도전 컴파운드의 결정화도와 분산 특성의 상관관계에 대한 연구
한재규,윤준형,성수연,전근배,박동하,Han, Jae Gyu,Yun, Jun Hyeong,Seong, Soo Yeon,Jeon, Geun Bae,Park, Dong Ha 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.5
In this paper, we study the correlation between the crystallinity of semiconductive compounds for eco-friendly power cables and the dispersive properties of carbon black. The crystal structure of the polymer material is advantageous for mechanical properties and heat-resistance. However, the polymer acts as an inhibitor to the dispersibility of carbon black. The purpose of this study is to develop a TPE semiconductive compound technology. The high heat resistance and ultra-smoothness characteristics which are required for high voltage and ultra-high voltage cables should be satisfied by designing and optimizing the structure of a non-crosslinking-type eco-friendly TPE semiconductive compound. The application of excess TPE resin was found to not only inhibit the processability in the compounding process, but also reduced the dispersion properties of carbon black due to higher crystallinity. After the crystallinity of the compound was identified through DSC analysis, it was compared with the related dispersion characteristics. Through this analysis and comparison, we designed the optimal structure of the eco-friendly TPE semiconductive compound.
내충격성 및 전기적 특성 향상을 위한 반도전성 난연컴파운드의 나노융복합 소재기술에 대한 연구
한재규,전근배,박동하 한국융합학회 2021 한국융합학회논문지 Vol.12 No.1
본 연구에서는 초고압(Extra High Voltage) 케이블의 방식층(Oversheath)에 사용되는 반도전성 난연컴파운드 의 보다 우수한 내충격성 및 전기적 특성을 만족할 수 있는 나노융복합 소재기술에 대해 연구하였다. 반도전성 난연컴파 운드에 사용되는 도전성 카본블랙 일부를 CNT(carbon nano tube)로 대체하였으며, 이때 물성변화를 분석하였다. 전 기적 특성이 현격하게 뛰어난 탄소나노튜브의 적용을 통해 소량의 전도성필러 처방으로도 보다 우수한 전기적 특성을 부여할 수 있게 된다. 또한, 컴파운드 기준 전체 필러량이 감량됨에 따라서 가공성이 향상되며, 특히 유연성 및 내충격성 이 향상되기 때문에 케이블의 내구성 향상에 기여할 것으로 기대된다. In this study, a nano-convergence material technology that can satisfy the superior impact resistance and electrical properties of the semiconducting flame retardant compound used in the Oversheath layer of Extra-high voltage cables was studied. When some of the carbon black used in the semiconducting flame-retardant compound was replaced with CNT (carbon nano tube), the change in physical properties was analyzed. Through the application of carbon nanotubes with remarkably excellent electrical properties, even a small amount of conductive filler formulations can provide superior electrical properties. In addition, as the total filler amount is reduced based on the compound, the workability is improved, and in particular, flexibility and impact resistance are improved, which is expected to contribute to the improvement of the durability of the cable.
한재규,이재식,김동학 한국전기전자재료학회 2023 전기전자재료학회논문지 Vol.36 No.6
Carbon black with high purity and excellent conductivity is used as a conductive filler in the semiconductive compound for EHV (Extra High Voltage) power cables of 345 kV or higher. When carbon black and CNT (carbon nanotube) are applied together as a conductive filler of a semiconductive compound, stable electrical properties of the semiconductive compound can be maintained even though the amount of conductive filler is significantly reduced. In EHV power cables, since the semi-conductive layer is close to the conductor, stable electrical characteristics are required even under high-temperature conditions caused by heat generated from the conductor. In this study, the theoretical principle that a semiconductive compound applied with carbon black and CNT can maintain excellent electrical properties even under high-temperature conditions was studied. Basically, the conductive fillers dispersed in the matrix form an electrical network. The base polymer and the matrix of the composite, expands by heat under high temperature conditions. Because of this, the electrical network connected by the conductive fillers is weakened. In particular, since the conductive filler has high thermal conductivity, the semiconductive compound causes more thermal expansion. Therefore, the effect of CNT as a conductive filler on the thermal conductivity, thermal expansion coefficient, and volume resistivity of the semiconductive compound was studied. From this result, thermal expansion and composition of the electrical network under high temperature conditions are explained.
지속가능한 친환경 한우 사양 전략 수립을 위한 일당증체량과 도체 특성에 관한 상관성
박명선 ( Park Myungsun ),전은정 ( Jeon Eunjeong ),한재규 ( Han Jaekyu ),김정용 ( Kim Joung-yong ),원미영 ( Won Mi-young ) 한국유기농업학회 2021 韓國有機農業學會誌 Vol.29 No.1
The present study investigated the effect of average daily gain (ADG) on carcass traits of Hanwoo steers. A total of 233 heads of Hanwoo steer slaughtered from 2017 to 2020 were employed in the analysis. Their body weight profiles during feedlot and carcass traits were used. The entire feedlot period is split into two periods. ADG during the first period (ADG1) was then defined as an independent variable in statistical analysis. In the meantime, it was examined that how the cutoff month for the period split altered the significance of the effect of ADG1 on carcass traits. Subsequently, steers were assigned to two groups (High vs. Low) based on the median of total ADG1, and we compared the carcass traits of each group using a linear mixed model. ADG1 during 10 to 23 months showed a significant effect on all carcass traits except the marbling score. ADG1 significantly influenced carcass weight and eye muscle area of Hanwoo steers. And it was found that greater ADG1 could get greater carcass weight and eye muscle area (p<0.001). The result of this study provides preliminary information for the target month in the calculation of ADG1 mostly influencing carcass performance, and feeding strategy of Hanwoo steer in terms of sustainability.
친환경 육계 생산을 위한 장 점막 밀접 접합 단백질의 발현량 조절이 생산성에 미치는 효과: Meta-analysis
전은정 ( Jeon Eun-jeong ),박명선 ( Park Myung-sun ),한재규 ( Han Jae-kyu ),김정용 ( Kim Joung-yong ),안성일 ( Ahn Sung-il ) 한국유기농업학회 2021 韓國有機農業學會誌 Vol.29 No.1
In this study, a meta-analysis was performed to determine the correlation between the expression of tight junction protein in the intestine and the productivity of broiler chickens. A total of 9 papers were selected in which the result values consisted of the mean and standard deviation value, and the standardized mean difference was calculated to compare the mean of the control and treatment groups. A meta-regression test was conducted to determine the effect of each type of tight junction protein. The TJPs observed in each study were claudin1, claudin2, claudin3, occludin, ZO1, ZO2, etc., and the indicators to indicate the productivity of broilers were body weight gain (BWG), feed intake (FI), and feed conversion rate (FCR), average daily feed intake (ADFI), average daily gain (ADG), and feed/gain ratio (FPG). Although there are differences depending on the type of TJP, it was found that the change in expression level had a close effect on the productivity of broilers. In particular, occludin significantly correlated with body weight gain, feed intake, and feed conversion rate. Based on the results of this study, a study on a method to effectively increase the expression level of TJP is expected to contribute to improving the productivity of broilers and producing safe livestock products.
나노 유무기 복합 컴파운드 기술 적용 절연/반도전 컴파운드의 물성/전기특성 평가 및 모델케이블의 Impulse 파괴시험을 통한 컴팩트형 EHV급 지중케이블 적용성 평가
유승범(Seung Bom Ryu),허지혁(Ji Hyuk Heo),배건오(Gun O Bae),한재규(Jae Kyu Han),박상규(Sang Kyu Park),최석환(Seok Hwan Choi) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
국내 345kV 송전 계통은 2003년에 도입된 이후로 주요 국가 기간망으로 자리 잡았으며, 최근 환경적 요인 및 민원 증가에 따라 기존 가공(over head) 선로를 지중선로로 대체하고자 하는 사회적 요구에 따라 지중화가 활발히 진행중이다. 이를 컴팩트화하여 시공비, 접속비용을 저감하고자 하는 국내외 수요가 증가함에 따라 EHV급 컴팩트 지중케이블을 개발하고자 한다. 기존 반도전 층에 사용되는 35% 이상의 카본블랙을 CNT 등 이종 카본으로 대체하여 카본 함량을 낮추고 이를 통하여 카본 필러 뭉침에 의한 돌기를 억제하는 연구를 수행하였으며, 이종 베이스레진을 혼합하는 연구를 수행하였다. XLPE 절연 컴파운드는 초고순도화 및 나노 복합 기술을 적용하여 절연성능 향상에 대한 연구를 수행하였다. 물성 및 전기특성을 평가하기 위하여 UTM, 체적고유저항 분석기, AC 파괴시험기를 사용하였으며 나노 복합 기술이 적용된 컴파운드의 케이블 적용 가능성을 평가하였다. 이렇게 개발한 절연/반도전 컴파운드를 적용하여 모델케이블을 제조하여 Impulse 파괴시험을 수행하였으며 EHV급 초고압 케이블에 적용 가능함을 확인하였다.