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Convergence acceleration of Navier-Stokes equation using adaptive wavelet method
강형민,Imran Ghafoor,이도형 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.2
An efficient adaptive wavelet method is proposed for the enhancement of computational efficiency of the Navier-Stokes equations. The method is based on sparse point representation (SPR), which uses the wavelet decomposition and thresholding to obtain a sparsely distributed dataset. The threshold mechanism is modified in order to maintain the spatial accuracy of a conventional Navier-Stokes solver by adapting the threshold value to the order of spatial truncation error. The computational grid can be dynamically adapted to a transient solution to reflect local changes in the solution. The flux evaluation is then carried out only at the points of the adapted dataset, which reduces the computational effort and memory requirements. A stabilization technique is also implemented to avoid the additional numerical errors introduced by the threshold procedure. The numerical results of the adaptive wavelet method are compared with a conventional solver to validate the enhancement in computational efficiency of Navier-Stokes equations without the degeneration of the numerical accuracy of a conventional solver.
강형민 한국현대영미드라마학회 2011 현대영미드라마 Vol.24 No.3
The idea of housewifization has evolved with the historical development of capitalism in order to justify and reinforce the sexual division of labor in the patriarchal capitalist mode of production. The sexual division of labor is meant to maximize the accumulation of capital by taking women’s labors and activities as mothers and housewives without payment. The historical development of sexual division of labor is closely linked with Western colonialism since the 16th century. In the beginning of housewifization, the European colonizers tried to domesticate their own women into the pure breeders of their next generation while they just exploited the colonized women’s labor forces without letting them have the opportunity of reproduction of their next generations. In Europe, the European colonizers created the patriarchal nuclear family and applied it to the propertied classes and eventually extended it to the working class in order to sustain a proper level of industrial reserve army. Unlike their women, since the European working class men had some material interests in the capitalist system and they could enjoy their dominant status in the family as the sole breadwinner, they accepted the bourgeois ideology of family and the system of housewifization, and enforced those on their women. However, since the main purpose of women’s housewifization is to exclude women from the public sector, all women’s work is undervalued or devalued. Thus, women’s housewifization has been the one of the main oppressors of women in the capitalist system. In Willy Russell’s Educating Rita, the two male characters--Rita’s husband Denny and her professor Frank in the Open University--try to make Rita just a housewife within their own class limits. Rather than help his wife become a full-fledged woman by finding her true self through her late education at the Open University, Denny forces her to be pregnant and thus to be a typical housewife as a working class woman. Unlike Denny, although Frank provides Rita with some academic helps that she longs for, Frank eventually also tries to keep Rita under his own control and influence by making her his own wife and thus making her a typical middle class housewife. However, Rita transcends these attempts and eventually uses her education in the Open University as the opportunity to find her true self and possibilities. Although the Open University education does not give her any real benefits, Rita, at the end of the play, becomes mature enough to cope with the harsh realities in her life as an independent chooser.
Born on the Fourth of July: From Victim to Savior
강형민 한국현대영미드라마학회 2020 현대영미드라마 Vol.33 No.1
Based upon Ron Kovic’s autobiography, Olive Stone’s Born on the Fourth of July dramatizes how the protagonist, Ron Kovic, has progressed from a victim of the nation to a savior of the nation. At first, Kovic believes in the values of American society and American Myth. More specifically, Kovic truly follows the values represented by American institutions: family, community, military and history. However, through his experiences in the Vietnam War, he has disillusioned with the existing values since he comes to believe that those values are nothing but lies. Through its three-part dramatic structure, part one of Born on the Fourth of July shows the process of how the traditional American ideology has brainwashed and sent the innocent protagonist to the Vietnam War and sacrificed him. Paralyzed from the chest down because of his wound in Vietnam, the protagonist returns home and begins to experience the home front in part two of the film. Although the protagonist has become disillusioned with the American institutions and their values on the one hand in his war on the home front, he has also come to terms with his own mistakes and damaged self on the other. Thus, in part three of the film, the protagonist emerges as the national savior equipped with his new political and moral awakening as well as his anti-war activism.
ESAD의 기폭 파형 예ESAD의 기폭 파형 예측을 위한 측정기반 LEEFI 모델링 및 검증측을 위한 측정기반 LEEFI 모델링 및 검증
강형민,김정호,황석현,정명숙,조세영,손중탁 한국군사과학기술학회 2019 한국군사과학기술학회지 Vol.22 No.1
In this paper, we propose measurement based numerical resistivity model for low energy exploding foil initiator (LEEFI) of electronic safety and arming device(ESAD). A resistivity model describes a behavior of variable resistance in LEEFI by firing current. The previous resistivity model was based on high energy detonator applications as explosive bridge wire and exploding foil initiator. Therefore, to estimate the voltage, current, and burst time of LEEFI, a resistivity model suitable for LEEFI is needed. For the modeling of resistivity of LEEFI, we propose a specific action based equation which represents a behavior of LEEFI when firing current is applied. To verify the proposed model, we analyze a firing current transmission path to obtain parasitic impedance. We experimentally verify that the proposed resistivity model offers precise estimation for the behavior of variable resistance in LEEFI.