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송전용 자기 애자의 절연 내력 및 시멘트 열화에 대한 연구
손주암(Ju-Am Son),최인혁(In-Hyuk Choi),구자빈(Ja-Bin Koo),김태용(Taeyong Kim),이준신(Junsin Yi) 대한전기학회 2020 전기학회논문지 Vol.69 No.2
Porcelain insulators for transmission play an important role in isolating and supporting power lines and transmission towers. There is a lack of research on porcelain insulators for transmission compared to other power installations. Therefore, in this paper, the measurement and analysis of insulation strength and cement corrosion of porcelain insulators for power transmission were carried out. Domestic pollution level calculation is determined by the equivalent salt deposit density (ESDD). In this paper, insulation strength measurement and cement corrosion analysis were performed by extracting 36,000lbs porcelain insulators from 427.3m, 469.9m and 571m away from the coast. As a result, the average insulation strength of porcelain insulators, 427.3m away from the coast, was measured as 29,400MΩ. The insulation strength of porcelain insulators 571m away from the coast was measured at 2,500MΩ. The measurement results show a 11.8-fold decrease in the insulation strength in porcelain insulators that are relatively far from the coast and closer to the mountainous region than the insulation strength of porcelain insulators near the coast. As a result of cement corrosion measurement of the sample, hydrogen ion concentration(pH) was measured to estimate degradation. Cement corrosion of porcelain insulators that are extracted from the research was measured at pH 13 of porcelain insulators, 427.3m from the coast. The pH of porcelain insulators at 469.9m away was measured at 11, and the pH of porcelain insulators 571m away from the coast and close to the mountainous area was measured at 7. Stress accumulation of cement with humidity is considered to be more important factors for reducing the insulation strength of porcelain insulators to determine cement corrosion than salt in coastal areas.
Kim, Gyeong Woo,Son, Young Hoon,Yang, Hye In,Park, Jin Hwan,Ko, Ik Jang,Lampande, Raju,Sakong, Jeonghun,Maeng, Min-Jae,Hong, Jong-Am,Lee, Ju Young,Park, Yongsup,Kwon, Jang Hyuk American Chemical Society 2017 Chemistry of materials Vol.29 No.19
<P>In this paper, we report two new phenanthroline-based compounds, 1,4-bis(2-phenyl-1,10-phenanthrolin-4-yl)benzene (<I>p</I>-bPPhenB) and 1,3-bis(2-phenyl-1,10-phenanthrolin-4-yl)benzene (<I>m</I>-bPPhenB), for the charge generation unit of tandem organic light-emitting diodes (OLEDs). These two compounds exhibited high electron mobility of (5.8–4.4) × 10<SUP>–3</SUP> cm<SUP>2</SUP>/(V s), a very small injection barrier at the p–n junction interface, a high glass transition temperature of 123.9–182.1 °C, and exceptionally good operational stability. Because of such excellent characteristics, a single-stack red phosphorescent OLED (PhOLED) with <I>p</I>-bPPhenB showed a low driving voltage (2.7 V) and significantly improved maximum power efficiency (56.8 lm/W), external quantum efficiency (30.8%), and device lifetime (LT<SUB>95</SUB>, 130 h) compared to those of the control device using bathophenanthroline (Bphen) (3.7 V, 39 lm/W, 27.1%, and 13 h). Furthermore, a two-stack (tandem) red PhOLED using <I>p</I>-bPPhenB in the charge generation unit exhibited superior charge generation as well as electron transport properties and excellent device performances (5.0 V, 54.0 lm/W, 56.1%) compared to those of the tandem device using Bphen (6.2 V, 45.2 lm/W, 53.3%).</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2017/cmatex.2017.29.issue-19/acs.chemmater.7b02655/production/images/medium/cm-2017-026556_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm7b02655'>ACS Electronic Supporting Info</A></P>
금연 성공군의 금연 실패군과 비교를 통한 금연 성공요인 분석
이지현(Lee Ji-Hyun),손조욱(Son Jo-Ug),박성희(Park Seong-Hee),이윤복(Lee Yun-Bok),지영주(Jee Young-Ju),김윤지(Kim Yoon-Ji),노선영(Nor Sun-Young),이현암(Lee Hyun-Am) 고신대학교 전인간호과학연구소 2008 전인간호과학학술지 Vol.3 No.-
Background: In spite of harmfulness of smoking, the smoking rate of adult is high in Korea. Korea is one of the heavist smoking countries, due to the tolerant environments towards smokers, the weak anti-smoking police and the undeveloped smoking cessation programs. Recently, though those who succeed in stoping smoking and maintaining it are increasing, there are few studies about the characteristics of those who successful in smoking cessation. The purpose of this study is therefore to identify what factors are likely to influence the effectiveness of smoking cessation in adult Korean smokers. Method: Participants were 108 smokers(success group 45, failure group 63), registered at an public health center(80) and working area 28) smoking cessation program from Apr. to Nov. 2006 were included, the questionnaire consisted of questions of health perception(HP), satisfaction(SA), vality(VA), emotional function(EF), fagerstrom tolerance questionnaire, (FTQ) and the why test. Result: There was no relationship between the two groups in the demographic characteristics. In view of success of smoking cessation that can influences them such as physical pain, Nicotine dependence, stress rating pain and counselor of smoking cessation Conclusion: The results of logistic regression analysis was shown that the factor that is most associated with success of smoking cessation is the counselor of smoking cessation. This means that the more people who smoke consult with nurse and the longer the period of utilizing the smoking cessation clinic is, the more successful they are in smoking cessation.
석유증진회수에 적합한 나노 에멀젼의 제조 및 필터링 시험 분석
손한암,이근주,조장우,임경철,김진웅,김현태,Son, Han Am,Lee, Keun Ju,Cho, Jang Woo,Im, Kyung Chul,Kim, Jin Woong,Kim, Hyun Tae 대한자원환경지질학회 2013 자원환경지질 Vol.46 No.1
최근 나노기술을 이용한 석유증진회수기술은 미국을 중심으로 활발한 연구가 진행되고 있다. 지금까지의 연구에서는 주로 다공성 매체 내 나노입자의 유동특성이나 나노 에멀젼 자체의 안정성 평가에만 중점을 두었으며, 다공성 매체 내 나노 에멀젼의 유동시 중요한 역할을 하는 나노 에멀젼과 공극의 크기 효과는 분석하지 않았다. 이 연구에서는 석유증진회수기술에 적용 가능한 나노기반의 에멀젼을 제조하였으며, 그 특성을 분석하였다. 또한 다공성 매체 내 나노 에멀젼의 유동특성을 파악하기 위해 필터링 시험을 통해 나노 에멀젼의 크기효과를 분석하였다. 연구결과 나노 에멀젼의 제조시 SCA(Silane Coupling Agent)나 PVA(poly Vinyl Aclohol)를 첨가하여 에멀젼을 제조할 때 안정성이 개선되며, 물에 비해 데칸의 비율이 높을수록 점성도가 높아지고, 액적크기가 증가하는 것을 확인하였다. 대기압조건하에서 수행한 필터링 시험에서는 분리된 물이 주로 통과하고 액적은 통과하지 못하는 것이 확인되었다. 이는 액적의 유동력이 필터에 작용하는 모세관압을 극복하지 못하였기 때문에 나타난 현상이다. 흡입압력을 작용한 필터링시험에서는 $60{\mu}m$ 크기 이상의 필터에서는 대부분 액적이 통과 하였으나, $45{\mu}m$ 이하의 필터에서는 통과비율이 급격히 저하되는 것을 확인하였다. 이러한 현상은 필터 공극 통과시 강한 전단응력에 의해 액적이 변형되거나 파괴되어 공극을 막기 때문에 나타나는 현상으로 보인다. 이 연구에서 밝혀진 기본적인 나노 에멀젼의 특성 및 필터링 시험 결과는 향후 안정적인 나노 에멀젼 제조나, 다공성 매체 내 잔류오일 회수연구에 중요한 역할을 할 수 있을 것이다. Researches on the oil recovery enhancement using the nanotechnology has recently been studied in the United States. The previous researches has focused mainly on the flow characteristics of nanoparticles in porous media, and the stability of the nano-emulsion itself. However, the analysis did not deal with the size effects between a nano-emulsion and the pore size which has an important role when nano-emulsion flows in the porous media. In this research, nano-based emulsion was fabricated which is able to be applied for the enhanced oil recovery techniques and its characteristics was analyzed. In addition, in order to identify the characteristics of nano-emulsions flowing through the porous media, the size effect was analysed by filtering test. According to the results, when the emulsion was fabricated, SCA(Silane Coupling Agent) or PVA(Poly Vinyl Alcohol) are added to improve the stability of emulsion. As the ratio of the decane to water increased, the viscosity of emulsion and the droplet size also increased. For the filtering test at the atmospheric conditions, the droplet did not go through the filter; only the separated water from the emulsion was able to be filtered. This phenomenon occurred because the droplet was not able to overcome the capillary pressure. At the filtering test by suction pressure, most of the emulsion was filtered over the filter size of $60{\mu}m$. However, the ratio of filtration was rapidly degraded at less than $45{\mu}m$ filters. This is caused due to deformation and destruction of the droplet by strong shear stress when passing through the pore. The results from the study on the basic characteristic of nano-emulsion and filtering test will be expected to play as the important role for the fabrication of the stable nano-emulsion or the research on the recovery of residual oil in porous media.
Influence of Electrolytic and Crevice Corrosion on Mechanical Resistance of Porcelain Insulators
Matheus Rabelo,Simpy Sanyal,Taeyong Kim,Ju-Am Son,In-Hyuk Choi,Junsin Yi 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7
Porcelain insulators are widely used in transmission lines; however, their durability and considerable overall maintenance cost have become problems over the years. In this work, porcelain insulators were collected from various locations in South Korea and classified according to their length of service. Mechanical and electrical load tests were performed, and the failure load and damaged region were recorded for each specimen. The fast degradation of the pin in porcelain insulators exceeding 50 years in operation was notable because there was no pin breakage among the samples in service for less than 50 years. Moreover, the failure of 73.68% of all porcelain insulators in service for 54 years occurred in the pin. The average failure load of these samples was 14% lower than that of samples in use for 45 years. To confirm the pin’s deterioration mechanism over time, a mechanical analysis of the reduction in the pin cross-section was performed using the finite element analysis method. Accordingly, a novel degradation mechanism is proposed in this study. Previous studies that focused on the critical areas of the porcelain insulator found that the exposed pin side was easily damaged by the external load. The current findings revealing an unfamiliar porcelain deterioration mechanism may aid in the formulation of a better design to mitigate the problems described above.