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냉간성형 탄소강 일면전단 2행 2열 볼트접합부의 종국거동에 관한 해석적 연구
정하영(Jeong Ha-Young),김태수(Kim Tae-Soo),김승훈(Kim Seung-Hun),김승훈(Kim Seung-Hun),이용택(Lee Yong-Taeg) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
Finite element analysis (FEA) procedures, which was conducted by T.S Kim for predicting the structural behaviors of single shear bolted connections in cold-formed carbon steel were already recommended through previous numerical study for Kuwamura's test results, and are also introduced briefly in this paper. It was shown that ultimate behaviors such as ultimate strength, failure mode and curling occurrence by FEA were in a good agreement with those of test results. Based on the reasonable prediction accuracy of numerical approach, parametric studies on four bolted connections with extended variables; end distance in the direction of load are conducted in order to investigate the ultimate strength and curling behavior of single shear cold-formed carbon steel connections.
정하영(Jeong, Ha young) 한국고전여성문학회 2002 한국고전여성문학연구 Vol.0 No.4
어머니는 문학, 음악, 미술 등 여러 예술 양식의 중요한 제재가 되어 왔으며, 고소설에서도 중요한 작중인불 가운데 하나로 등장한다. 고소설의 주변인물로 등장하는 어머니像은 신화, 설화로 이어지는 서사운학의 맥락을 계승하고 있다. 여성은 딸, 아내, 며느리의 역할을 거쳐서 어머니가 되며, 작품 속에 나타나는 어머니의 역할은 '낳는 일'과 '기르고 돌보는 일'로 요약된다. 신화에서는 '낳는 일'에 중점을 둔 '어머니 되기'를 중시하고, 설화는 '기르고 돌보는 일'에 중점을 둔 '어머니노릇 하기'에 중점을 둔다. 고소설에서 어머니는 이 두 가지 기능을 함께 수행하는 것으로 드러난다. 고소설은 '逸脫的 사건'과 '문제적 인물'을 다루는 이야기이다. 따라서 고소설에선느 어머니를 '성스럽고 고귀한 존재'로 보면서도 부정적이거나 문제적 인물을 등장시켜 바람직한 어머니상을 제시하는 방식을 취하고 있다. Mother' is a special being connected with the whole life journey of a person and her . image has been substantial material for various art foam of literature, music, painting, etc. In relation with all sorts of things ranging from one's birth and growth to one's marriage, a mother directly and indirectly exerts her influence upon her child. Naturally, the presence and role of a mother are seriously taken in classical novels which contain the narrative cf a character's lifetime. As a character, a mother records the most frequent appearance in classical novels, but the weight of her role in the work does not match the frequency of her appearance. It is hard to find any work in which a mother is entitled to the role of a main character. In most works she is one of the marginal characters with insignificant roles. Based on the typical image of a mother in the Choseon Dynasty, the mother's image depicted in classical novels embraces and cherishes the traditional image of a mother in myths and fables. In the male-oriented Choseon society a woman became a mother through the cycle of daughter, wife, and daughter-in-law. Although she had various roles as mother, her roles could be conclusively divided into two important things; child-bearing and child-rearing. In myths che narrative illuminates the child-bearing and in fables the child-rearing is emphasized. Upholding and embracing the tradition of myths and fables, classical novels develop the image of a mother. The narrative of a main character's birth unfolds the image of 'becoming a mother', and the process of one's growth, marriage, and social success highlights 'playing the role of a mother'. Classical novels depict the image of a mother as 'a sacred and precious being,' while the delineated role of a mother is 'negative and passive'. If the patriarch of a family is absent or cannot do his job properly, the role of a mother is represented as aggressive and active. Since classical novels deal with 'deviated events' and 'problematic characters', the image of a mother cannot often escape from being negative or problematic instead of being common, ordinary, or modest. The reason of frequent negative image of a mother can be seen as a stratagem for the development of the reader's interest in and curiosity for classical novels. Simultaneously, the stratagem reflects the male-oriented way of thinking by which the patriarchical society tried to moralize about the behaviour of women through literature.
박판 탄소강 일면전단 볼트접합부의 최대내력에 관한 연단거리의 변수 해석
정하영(Jeong Ha-Young),임진성(Lim Jin-Seong),김태수(Kim Tae-Soo),김승훈(Kim Seung-Hun),이용택(Lee Yong-Taeg) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
The purpose of this study is to investigate the ultimate behaviors and curling influence using numerical modeling based on the previous test result of single shear bolted connection with thin-walled carbon steel. Specimens with long end distance, which are planned to fail by black shear fracture showed severe curling and the reduction of ultimate strength was caused by curling. In this paper, the validity of finite element analysis(FEA) is verified through the comparisons between test results and analysis results of specimens with end distance as variables and same plate thickness, bolt diameter, pitch and gage as common dimension. Utilizing the applicability of FEA, numerical models with additional variables of end distance and edge distance, which are not considered in test specimens are assumed, Conditions of curling occurrence according to end distance/edge distance and the influence of curling on ultimate strength are investigated. Therefore, it is known that curling behaviors are different from given variables and the strength reduction rate gets higher with the increase of end distance/edge distance.
다층 퍼셉트론을 이용한 인버터의 효율 감소 진단 모델에 관한 연구
정하영(Ha-Young Jeong),홍석훈(Seok-Hoon Hong),전재성(Jae-Sung Jeon),임수창(Su-Chang Lim),김종찬(Jong-Chan Kim),박철영(Chul-Young Park) 한국멀티미디어학회 2022 멀티미디어학회논문지 Vol.25 No.10
This paper studies a model to diagnose efficiency reduction of inverter using Multilayer Perceptron(MLP). In this study, two inverter data which started operation at different day was used. A Multilayer Perceptron model was made to predict photovoltaic power data of the latest inverter. As a result of the model’s performance test, the Mean Absolute Percentage Error(MAPE) was 4.1034. The verified model was applied to one-year-old and two-year-old data after old inverter starting operation. The predictive power of one-year-old inverter was larger than the observed power by 724.9243 on average. And two-year-old inverter’s predictive value was larger than the observed power by 836.4616 on average. The prediction error of two-year-old inverter rose 111.5572 on a year. This error is 0.4% of the total capacity. It was proved that the error is meaningful difference by t-test. The error is predicted value minus actual value. Which means that PV system actually generated less than prediction. Therefore, increasing error is decreasing conversion efficiency of inverter. Finally, conversion efficiency of the inverter decreased by 0.4% over a year using this model.