A Study on the Condition Diagnosis for A Gas-insulated Transformer using Decomposition Gas Analysis

김아름,곽병섭,전태현,박현주,Ah-Reum, Kim,Byeong Sub, Kwak,Tae-Hyun, Jun,Hyun-joo, Park Korea Electric Power Corporation 2022 KEPCO Journal on electric power and energy Vol.8 No.2

A growing number of gas-insulated transformers in underground power substations in urban areas are approaching 20 years of operation, the time when failures begin to occur. It is thus essential to prevent failure through accurate condition diagnosis of the given facility. Various solid insulation materials exist inside of the transformers, and the generated decomposition gas may differ for each gas-insulated equipment. In this study, a simulation system was designed to analyze the deterioration characteristics of SF₆ decomposition gas and insulation materials under the conditions of partial discharge and thermal fault for diagnosis of gas-insulated transformers. Degradation characteristics of the insulation materials was determined using an automatic viscometer and FT-IR. The analysis results showed that the pattern of decomposition gas generation under partial discharge and thermal fault was different. In particular, acetaldehyde was detected under a thermal fault in all types of insulation, but not under partial discharge or an arc condition. In addition, in the case of insulation materials, deterioration of the insulation itself rapidly progressed as the experimental temperature increased. It was confirmed that it was possible to diagnose the internal discharge or thermal fault occurrence of the transformer through the ratio and type of decomposition gas generated in the gas-insulated transformer.

헤어살롱의 관계마케팅이 살롱선택속성과 고객만족에 미치는 영향

김아름 ( Ah Reum Kim ),전근옥 ( Gun Ok Jun ),조현진 ( Hyeon Jin Jo ),박은준 ( Eun Jun Park ) 한국미용학회 2020 한국미용학회지 Vol.26 No.5

The recent diversification of consumer tastes has caused supply to exceed demand, shifting the market's lead from businesses to heads. In this competitive market environment, hair salons are experiencing major difficulties in management, and attracting customers among them is a major problem. In this study, the effect of relationship marketing on saloon selection and satisfaction is found among customers using salons and the design of programs to attract customers is significant. The questionnaire was used in the study and the collected data was analyzed using SPS 22.0. To determine the effect between each parameter, the effect of the parameter was determined using regression and parametric regression. The results showed that unmarried women in their 20s had the highest response rate, the average monthly Sodden was between 2 and 3 million, the grade was college students, and the profession was the highest. Relationship marketing was derived from operation services and communication, and customer satisfaction was derived with brand attributes, internal attributes and external attributes, with the degree of satisfaction, recommendation and revisit. Each parameter was shown to affect each other. It is expected that the number of new customers will increase through the recommendation of fixed customers by making efforts to communicate with customers and establishing a revisit system and membership system in Salon.

2005년부터 2016년까지의 퇴원손상심층조사에서 비사망을 포함한 고의적자해방법과 호전율의 변화추이

김아름 ( Ah-reum Kim ),정선락 ( Sun-rak Jeong ),김은석 ( Eun-seok Kim ),이원기 ( Won Kee Lee ) 한국보건정보통계학회(구 한국보건통계학회) 2021 한국보건정보통계학회지 Vol.46 No.2

Objectives: The purpose of this study is to estimate trend of intentional self-harm methods and recovery rate by using ICD (International Classification of Diseases)-10 codes (X60-X84). Methods: The analysis was based on data of intentional self-harm injury in 2005-2016 from hospital discharge registry investigation in Korea. Results: Through 2005-2016, intentional self-harm by drug was the most common. Self-harm caused by pesticides has decreased since 2012, but those caused by gas has increased rapidly since 2008. By ages, pesticide poisoning by intentional was the most common in 60s and 80s, except those ages, self-harm by drug was the most frequent. The number of intentional self-harm was 1.2 times higher for women than for men, and for women, the rate of self-harm caused by drug was more than half. In the case of men, self-harm caused by pesticides was the most common, and they did various self-harm methods compared to women. The recovery rate tends to increase compared to the past, but as the age increases, it tends to decrease. In particular, the recovery rate of ‘hanging’ was significantly lower at 48.1%. Conclusions: Therefore, in order to increase the rate of recovery of the self-harm injuries that have already occurred, it is necessary to establish a variety of systems such as rapid reporting system and transfer to medical center.

헤어살롱의 감각마케팅이 살롱선택속성과 고객만족에 미치는 영향

김아름 ( Ah Reum Kim ),조현진 ( Hyeon Jin Jo ),전근옥 ( Geun Ok Jeon ),박은준 ( Eun Jun Park ) 한국미용학회 2021 한국미용학회지 Vol.27 No.3

The purpose of this study is to find out the importance of marketing that stimulates consumers' five senses and to further study the factors that consumers choose salons to help them find a developmental direction to enhance customer satisfaction. As for the subject of this study, a total of 350 questionnaires were distributed, and 323 of them were retrieved and statistical data was obtained with 312 valid questionnaires. SPSS 22.0 was used to analyze the collected data. Analytical analysis was carried out on the data in the form of frequency analysis, factor analysis, reliability analysis, and regression analysis. As a result, first, The tactile, palate, auditory, and visual areas, excluding olfactory areas, which are sub-factors of sensory marketing, were found to partially affect saloon selectivity (brand, internal and external attributes). Second, Sensory marketing also partially affected customer satisfaction, recommendation, and revisitability, of which auditory areas affected all factors. Through this study, the importance of sensory marketing and marketing strategy that increases positive customer response will be helpful.

연료 전지 분리판 유로 설계의 다각적 형상 도입을 통한 유동 특성 향상에 대한 고찰

김아름(Ah-Reum Kim),박주희(Joo-Hee Park),정성재(Sung-Jae Chung),엄석기(Sukkee Um) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5

실험실 창업현황과 육성방안 관한 고찰

김아름(Ah Reum Kim),신문삼(Moon Sam Shin) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.2014 No.2

본 논문에서는 실험실 창업현황과 실험실 창업을 육성할 수 있는 방안을 고찰하였다. 현재 대학연구지원체제의 보완을 위하여 연구지원체제 방식을 알아보았다. 이와 더불어 정부의 창업지원정책의 문제점을 분석하고 실제적인 창업지원 방안을 도출하고자 국내 3개 사립대학에서 창업한 교수들의 창업시 애로사항을 파악했다. 연구의 결과로 첫째, 대학의 연구지원 업무와 기술이전과 특허 등의 업무를 총괄할 수 있는 기존의 대학 행정조직에서 독립된 새로운 지원국의 필요성을 들었고 둘째, 교수평가제도에 있어서의 학문적인 업적뿐 아닌 벤처창업결과도 평가항목에 반영하는 보완이 필요하며, 셋째, 대학 내 창업보육센터의 효과를 더욱 촉진하기 위해 특성화된 센터들간의 네트웍이 보다 효율적인 창업지원방식이며, 넷째, 교수창업의 성공률을 높이기 위해서 창업중간단계의 필요성과 다섯째, 교수들의 창업자금의 적절한 지원을 할 수 있도록 하는 사립대학의 경우 교비의 일정부분을 지원할 수 있는 제도의 보완이 필요함을 제시했다. 본 연구가 모든 대학에 적용된다기보다 대학의 자율성의 토대 위에 그 대학의 비전과 목표에 적합한 교수창업지원정책을 추구하는 대학이라면 본 연구 결과의 활용은 유익할 것이라 생각한다.

대표 경로를 이용한 클러스터 기반 라우팅 프로토콜 설계

김아름 ( Ah-reum Kim ),장유진 ( You-jin Jang ),장재우 ( Jae-woo Chang ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.2

무선 센서 노드는 한정된 자원을 가지기 때문에 에너지 효율성을 높이는 것이 필수적이다. 이를 위해서 통신 메시지를 감소시킬 수 있는 클러스터 기반 라우팅 기법이 연구되었다. 하지만 기존 연구들은 클러스터 헤더가 임의로 선정되기 때문에 헤더 노드의 위치가 편중될 수 있어 비효율적이다. 이를 해결하기 위하여 본 논문에서는 홉(hop) 수 기반의 대표 경로를 생성하여, 분산된 클러스터 헤더를 선정하여 클러스터를 구성하고, 클러스터 헤더간 멀티 홉(multihop)을 구성하는 라우팅 프로토콜을 설계한다. 대표 경로를 통해 클러스터 헤더의 위치 및 영역이 균일하게 분포되도록 선출하고, 싱크 노드의 방향을 인식함으로써 우회하지 않는 효율적인 경로를 구성한다.

프랜차이즈 헤어살롱 인턴의 교육에 대한 만족, 활용, 직업몰입에 관한 연구

김아름 ( Ah Reum Kim ),박은준 ( Eun Jun Park ) 한국미용학회 2018 한국미용학회지 Vol.24 No.2

The purpose of this study is to examine the relationship among the satisfaction of the education, educational application, and occupational commitment of all interns at franchise hair salons. In addition it focuses on analyzing factors that increase occupational commitment to contribute the most important educational programs in human resources management with strong guidance. As for the subject of this study, a total of 270 questionnaires were distributed, and 250 of them were retrieved and statistical data was obtained with 244 valid questionnaires. SPSS 22.0 was used to analyze the collected data. Analytical analysis was carried out on the data in the form of frequency analysis, factor analysis, reliability analysis, and regression analysis. First of all, interns’ satisfaction of the education influenced the relationship commitments in the order of the satisfaction of the education system and the gratification of the education effect. Secondly, educational application has a significant effect on relationship commitment in the order of practical, psychological, and theoretical aspects, and on occupational commitment in order of psychological, theoretical, and practical aspects. In conclusion, on the basis of this research, it can be seen that companies should develop their employees’ abilities to provide psychological stability, a sense of belonging, and systematize level-specific education according to their ability to work. In addition, to provide high quality service to customers, they should investigate the satisfaction of employees' education and improve the quality of education. Furthermore, they should elevate employees’ minds so that they have confidence in their jobs, responsibility for their duties and solid work ethic.

조기 경보를 위한 화재 판단 알고리즘을 이용한 무선 센서네트워크 기반 화재 감시 응용 시스템 설계 및 구현

김아름(Ah-Reum Kim),조경진(Kyoung-Jin Jo),장재우(Jae-Woo Chang),심춘보(Chun-Bo Sim) 한국콘텐츠학회 2009 한국콘텐츠학회논문지 Vol.9 No.12

최근 문화재나 시설물 관리를 위한 화재 감시 응용 시스템에 대한 요구가 증대되고 있다. 이러한 화재 감시 시스템은 화재 상황을 대처할 수 있도록 지원함으로써 피해규모를 축소시킬 수 있다. 그러나 기존 시스템은 일정 주기로 화재 감시를 수행함으로써 화재 판단을 지연시키는 단점이 존재한다. 또한 감시 상황을 확인 할 수 있는 사용자 인터페이스를 제공하지 않는다. 따라서 이러한 두 가지 문제점을 해결하기 위하여 첫째, 조기 위험상황 경보를 위해 새로운 화재 판단 알고리즘(Early Fire Detection Algorithm)을 제안한다. 이는 데이터 분포를 기반으로 하여 화재 판단 시작 주기를 동적으로 설정하기 때문에, 화재 판단 시간 측면에서 기존 알고리즘 보다 우수하다. 둘째, 제안하는 화재 판단 알고리즘을 통하여 사용자 인터페이스를 제공하는 화재 감시 응용 시스템을 개발한다. 마지막으로 성능 실험을 통해, 개발된 시스템이 다양한 화재 상황에서 조기 위험상황 경보를 위해 활용될 수 있음을 보인다. Recently, fire monitoring application systems have been an active research area due to the safety of industries, historical monuments and so on. The fire monitoring application systems can reduce the damage of properties by providing earlier warning for possible fire situation. However, the existing systems have a drawback that they detect fire with delay due to their uniform epoch in fire detection algorithm. Moreover, they do not provide user-friendly graphical user interfaces in their fire monitoring systems. To resolve the problems, First, we propose a new fire detection algorithm (Early Fire Detection Fire Algorithm) which uses the distribution of sensing data for early fire detection. Our fire detection algorithm is better in terms of fire detection time than the existing work because it can set a start time of fire detection epoch dynamically based on data distribution. Second, we develop a fire monitoring application system which provides users with both a user-friendly graphical user interface and a fire alarm message when fire occurs. Finally, we show from our experiment that our developed system is effectively used for early fire warning in a variety of fire situations.

자연정화공법을 이용한 소형 축산폐수처리장치의 최적여재 선정

김아름(Ah-Reum Kim),김홍출(Hong-Chul Kim),서동철(Dong-Cheol Seo),박종환(Jong-Hwan Park),김성헌(Sung-Hun Kim),이성태(Seong-Tae Lee),정태욱(Tae-Uk Jeong),최정호(Jeong-Ho Choi),김현욱(Hyunook Kim),조주식(Ju-Sik Cho),허종수(Jong-Soo Heo) 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.2

소규모 축산농가로부터 발생되는 축산폐수를 효과적으로 처리하기 위한 인공습지를 개발하기 위하여 인공습지에서 가장 중요한 인자 중 하나인 최적 여재의 선정에 관하여 연구하였다. 최적여재를 선정하기 위하여 여재를 왕사, 쇄석, 제올라이트 및 방해석으로 달리하여 충진한 후 각 여재별 축산폐수 처리효율 조사한 결과 COD 처리효율은 왕사가 다른 여재에 비하여 높았고, SS 처리효율은 모든 여재에서 94~95%로 큰 차이 없었다. 또한 T-N 처리효율은 제올라이트가 다른여재에 비해 높았고, T-P 처리효율은 방해석이 다른여재에 비해 높았다. 이상의 결과에서 COD,SS, T-N 및 T-P 모두를 안정적으로 처리할 수 있는 최적여재는 왕사였다. 소형 축산폐수처리장치에서 질소와 인 처리효율을 극대화 하기 위해 호기성조 (왕사:쇄석:방해석=3:2:1)와 혐기성조 (왕사:쇄석:제올라이트=3:2:1)에 혼합여재를 주입한 결과 최적 여재인 왕사에 비해 질소 및 인 처리효율이 각각 15% 및 7% 향상되었다. In order to develop livestock wastewater treatment technology by natural purification method, the optimum filter media in small-scale livestock wastewater treatment apparatus for treating livestock wastewater were studied. Removal rates of pollutants under different filter media were in the other of coarse sand ≒ broken stone > zeolite > calcite for COD, zeolite >> broken stone ≒ coarse sand ≒ calcite for T-N, and calcite > coarse sand ≒ broken stone ≒ zeolite for T-P. Based on the above results, the optimum filter media was coarse sand in small-scale livestock wastewater treatment apparatus. To meet acceptable effluent quality standard for livestock wastewater and to improve T-N and T-P removal efficiencies, removal efficiencies of pollutants in small-scale livestock wastewater treatment apparatus with mixed filter media were studied. The removal rates of COD, SS, T-N and T-P in effluent were 84, 94, 65 and 98% in small-scale livestock wastewater treatment apparatus with mixed filter media, respectively. For increasing the T-N and T-P removals in small-scale livestock wastewater treatment apparatus, the mixed filter media are recommended.