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Yongtae Kim,Seunggyu Lee,Jongchul Kim,Seunghwa Ryu 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.77 No.3
In order to reduce enormous cost of real-scale underwater explosion experiments on ships, the mechanical response of the ships have been analyzed by combining scaled-down experiments and Hopkinson’s scaling law. However, the Hopkinson’s scaling law is applicable only if all variables vary in an identical ratio; for example, thickness of ship, size of explosive, and distance between the explosive and the ship should vary with same ratio. Unfortunately, it is infeasible to meet such uniform scaling requirement because of environmental conditions and limitations in manufacturing scaled model systems. For the facile application of the scaling analysis, we propose a generalized scaling law that is applicable for non-uniform scaling cases in which different parts of the experiments are scaled in different ratios compared to the real-scale experiments. In order to establish such a generalized scaling law, we conducted a parametric study based on numerical simulations, and validated it with experiments and simulations. This study confirms that the initial peak value of response variables in a real-scale experiment can be predicted even when we perform a scaled experiment composed of different scaling ratios for each experimental variable.
An Accuracy Enhanced Error Tolerant Adder with Carry Prediction for Approximate Computing
Yongtae Kim 대한전자공학회 2019 IEIE Transactions on Smart Processing & Computing Vol.8 No.4
This paper presents a new approximate adder design to improve the computation accuracy of the conventional error tolerant adder by leveraging a carry prediction technique with a sum generator. The proposed carry speculation scheme exploits inputs from a single bit position and effectively increase the bit width of the accurate addition. Implemented in a 65-nm CMOS technology, the proposed approximate adder is up to two times faster than, and twice as power efficient as, the traditional adders. Compared to the other approximate adders considered in this paper, the proposed adder achieves up to 3.7%, 15.5%, 79.9% and 79.9% reductions in the error rate (ER), mean relative error distance (MRED), mean error distance (MED) and normalized MED (NMED) respectively, at an extra cost of merely 4% to 6% in area, delay, and power. In addition, the proposed adder offers a good tradeoff between power/energy and accuracy and improves on power/energy-NMED products by up to 46%, outperforming other approximate adders.
Designing Neural Network Using Genetic Algorithm
Kim, Jeongryul,Park, Jeongsun,Kim, SungHee,Kim, Yongtae 明知大學校 産業技術硏究所 1998 産業技術硏究所論文集 Vol.17 No.-
본 연구는 보험 회사의 파산 예측을 위하여 신경회로망이 사용되는데 이를 최적화하기 위하여 유전자 알고리즘이 사용된다. 유전자 알고리즘은 최적의 네트워크 구조와 매개변수들을 제시해준다. 유전자 알고리즘에 의해 설계된 신경회로망은 파산 예측을 함에 있어 discriminant analysis, logistic regression, ID3, CART등과 비교되는데 가장 좋은 성능을 보여준다.
A Novel Approximate Adder with Enhanced Low-cost Carry Prediction for Error Tolerant Computing
Yongtae Kim 대한전자공학회 2019 IEIE Transactions on Smart Processing & Computing Vol.8 No.6
This paper proposes an approximate adder that employs a novel carry speculation scheme to enhance the computation precision of the existing error tolerant adder (ETA) designs with extremely little hardware overhead. The proposed carry prediction technique leverages two input bits to increase the prediction accuracy while the conventional ones do only one bit. This leads to a reduction of the carry prediction error rate from 25% to 18.75%. Compared to the existing ETA design, the proposed adder reduces normalized mean error distance (NMED) and mean relative error distance (MRED) by up to 10% and 28%, respectively, at the cost of only a two-input OR gate. Moreover, the proposed design outperforms the conventional ETAs when jointly evaluating hardware cost and computation accuracy. Specifically, the new design allows 11% and 17% reductions of area-power-NMED and power-NMED products, respectively, compared to the traditional ETA.
Samuel Johnson as a Moralist in "The Vanity of Human Wishes," The Rambler, and Rasselas.
Kim, Yongtae 한국현대영미어문학회 2001 The Journal of KACELLS Vol.6 No.2
Dealing with a series of his writings written from his late thirties to late forties, such as "The Vanity of Human Wishes," The Rambler, and Rasselas, this article sets out its argument with a premise that through these writings Samuel Johnson carries out experiments on moral problems. A crucial source of moral problems will be drawn from the phrase of "hunger of imagination" mentioned by Imlac in his visitation to the Pyramids in Rasselas and considered to be the root from which any other moral evils branched forth. Johnson's understanding of imagination has two sides: positive and negative. In its positive sense he praises man's capacity to create something special through his industrious working of imagination. Yet, it is the very negative side of imagination that I am going to examine in this article. He offers his negative view on imagination emphasizing the preying capacity of human imagination. The nature of preying imagination is that whatever we have we are always to imagine more; to imagine more leads to wanting more; and finally wanting more brings about fatal loss. Unchecked imagination is bound to give rise to other negative faculties of human mind: pride and wishing for fame delude us into thinking that we are standing over other people in terms of wealth, learning or political power, and, consequently, pride arouses envy and hostility among the opponents. Seeing that those moral problems are mainly caused by man's detachment from outside realities, therefore, Johnson suggests as an effective therapy the genuine contact with the variety of realities.