박판금속 성형공정에서의 블랭크 설계및 변형률 예측

이충호,허훈,Lee, Choong-Ho,Huh, Hoon 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.6

A new finite elemetn approach is introduced for direct prediction of bland shapes and strain distributions from desired final shapes in sheet metal forming. The approach deals with the geometric compatibility of finite elements, plastic deformation theory, minimization of plastic work with constraints, and a proper initial guess. The algorithm developed is applied to cylindrical cup drawing, square cup drawing, and fron fender forming to confirm its validity by demonstratin reasonable accurate numerical results of each problems. Rapid calculation with this algorithm enables easy determination of various process variables for design of sheet metal forming process.

준설매립지반의 지지력 산정

이충호,김주현,채영수,이송,Lee, Choong-Ho,Kim, Ju-Hyun,Chae, Young-Su,Lee, Song (사)한국토질및기초기술사회 2006 기술발표회 Vol.2006 No.-

In this test, there was two dimensional model loading test implemented for analysis with respect to the problem of evaluating bearing capacity and the application range on the dredged and reclaimed ground. It was got following conclusion through comparison of button's and Brown&Meyerhof"s equation with experimental result that was obtained by 2 dimensions model loading test. For the difference between average undrained shear strength by 2/3B of loading board width and under 2/3B is more than ${\pm}$ 50%, application of Nc(coefficient of bearing capacity was used in that case $\phi$=0 analysis is considered in the single layer) was declined. Brown&Meyerhof(1969)'s equation was underestimated comparing with loading test result, while Button(1953)'s equation was overestimated comparing with loading test result applied dividing as double layers of upper dessication layer and lower soft layer about dredged and reclaimed ground. Also, bearing capacity factors, Nc that was calculated by using button's equation was estimated greatly about 1.7 times more than bearing capacity factors, Nc that was calculated by using Brown&Meyerhof's equation. Bearing capacity factors, Nc that was calcuated by using Brown&Meyerhof's and Button's equation was evaluated each 2.3-3.6 times, 1.3-2.1 times smaller than bearing capacity factors, Nc5.14 that was calcuated by using Meyerhof's equation in case of unit layer.

위상 한정 상관법으로 얼굴을 인식하기 위한 최적 얼굴 영역의 정의

이충호,Lee, Choong-Ho 한국융합신호처리학회 2012 융합신호처리학회 논문지 (JISPS) Vol.13 No.3

위상한정 상관법은 특징점추출이나 고유얼굴을 사용하지 않고 얼굴을 인식할 수 있는 유용한 방법으로 정사각형 영역에 대하여 푸리에변환을 이용한다. 본 본문에서는 위상한정 상관법을 이용한 얼굴인식 방법의 성능을 향상시키기 위하여 이 기법에 보다 효과적인 정사각형 얼굴영역을 실험을 통하여 제안하고 있다. 구체적으로 세 가지 얼굴영역에 대하여 실험하였다. 첫째 머리부분과 여백을 포함하는 정사각형영역, 둘째 수평방향으로 양 귀 사이와 수직방향으로 턱끝에서 이마까지의 정사각형영역, 셋째 수평방향으로 입술 바로 밑을 지나는 선이 뺨영역과 만나는 두 점 사이, 수직방향으로 입술 바로 밑에서 이마까지의 정사각형영역이다. 실험결과 세 가지 영역 중에서 두 번째 얼굴영역이 위상한정 상관법의 임계치 설정에 가장 유리함을 보였다. POC(Phase-Only Correlation) is a useful method that can conduct face recognition without using feature extraction or eigenface, but uses Fourier transformation for square areas. In this paper, we propose an effective face area to increase the performance of face recognition using POC. Specifically, three areas are experimented for POC. The frist area is the square area that includes head and space. The second area is the square area from ear to ear horizontally and from the end of chin to the forehead vertically. The third area is the square area from the line under the lips to the forehead vertically and from cheek to cheek horizontally. Experimental results show that the second face area has the best advantage among the three types of areas to define the threshold for POC.

확산 신경 회로망을 이용한 광대역 공간 주파수 성분의 윤곽선 검출

이충호,권율,김재창,남기곤,윤태훈,Lee, Choong-Ho,Kwon, Yool,Kim, Jae-Chang,Nam, Ki-Gon,Yoon, Tae-Hoon 대한전자공학회 1995 전자공학회논문지-B Vol.b32 No.1

The diffusion neural network forms a Gaussian distribution by transferring an excitation to the surround. A DOG(difference of two Gaussians) is obtained by the diffusion neural network. This type of the DOG, which can detect the intensity changes of an image, has the same shape as a LOG(Laplacian of a Gaussian:${\Delta}^2$G) and narrow band pass characteristics. In this paper we show that another type of the DOG which has a very narrow Gaussian for the excitatory and a very wide Gaussian for the inhibitory, can be formed by the diffusion process of this network, This type of the DOG has a wide band width in spatial frequency domain and can be used efficiently in detecting special type of edges.

박판금속성형의 초기 블랭크 최적설계를 위한 삼차원 다단계 역해석

이충호,허훈,Lee, Choong-Ho,Huh, Hoon 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.12

Values of process parameters in sheet metal forming can be estimated by various one-step inverse methods. One-step inverse methods based on deformation theory, however, cause some amount of error. The amount of error is generally increased as the deformation path becomes more complex. As a remedy, a new three dimensional multi-step inverse method is introduced for optimum design of blank shapes and strain distributions from desired final shapes. The approach extends a one-step inverse method to a multi-step inverse method in order to reduce the amount of error. The algorithm developed is applied to square cup drawing to confirm its validity by demonstrating reasonably accurate numerical results. Rapid calculation with this algorithm enables easy determination of an initial blank of sheet metal forming.

Cascaded Encoding 기법을 이용한 영상 데이타 압축에 관한 연구

이충호(Choong Ho Lee),전중남(Joong Nam Jeon),연창모(Chang Mo Yon),박규태(Kyu Tae Park) 대한전자공학회 1986 대한전자공학회 학술대회 Vol.1986 No.12

박판금속성형의 최적 블랭크 설계를 위한 삼차원 다단계 역해석

이충호(Choong Ho Lee),허훈(Hoon Huh) 한국소성가공학회 1997 한국소성가공학회 학술대회 논문집 Vol.1997 No.5

디젤기관(機關)에 있어서의 메타놀의 사용(使用)에 대한 연구(硏究)

이충호 ( Lee Choong Ho ),김양술 ( Kim Yang Sool ),이길우 ( Lee Kil Woo ) 한국농공학회 1987 韓國農工學會誌 : 전원과 자원 Vol.29 No.1

Through the result of examinations and its study, such conclusions as described below can be found; 1. If methanol is made to flow from an inlet pipe, due to the latent heat of vaporization in methanol, the intake and exhaust temperatures are getting lower in comparison with the case of injection with diesel oil only. 2. If methanol is made to flow from an inlet pipe, the intake temperature is getting lower, nevertheless, there is not a great change in particular for the volume of the inhaled air, which is caused by the volume of the inhaled air gets damping with the partial pressure in methanol. 3. When the operation goes on under the slight load with the whole volume of the inhaled diesel oil, the methanol-air mixing unit gets remarkably increased in the heat rate due to an extremely weak combustion making progress and taking the initiative of the bad methanol for ignition. 4. Keeping up the volume of diesel oil needed to 3/4-load operation, and in case that the output of more than, that depends upon the intake of methanol, it is favorable to a heating economical aspect. 5) Methanol itself is bad in ignition and a diesel engine cannot be driven with methanol only, but while gushing out a considerable volume of diesel oil, methanol is able to make efficient use as subfuel for a diesel engine in such a manner as letting inhaled through and from the inlet pipe, and it can bring the effective curtailment of fuel relevant to pet volume, however, if the inhaled volume of methanol is excessive, there might happen a diesel knock. 6. In case that the cost of diesel oil rises a little, methanol as sub-fuel, would have a hight quality in economy.

일본 역사교과서 서술체제의 변화 -자유발행제에서 검인정제도까지(명치초~현재)-

이충호 ( Choong Ho Lee ) 역사교육학회 2004 역사교육논집 Vol.32 No.-

Before the period of Meiji in Japan, soldiers produced history books in the form of collection of letters to teach their family`s history. History books in the earlier period of Meiji described history from the realistic viewpoint. Free issued history books, which were mainly the translation of western books, were not much distinct from general publications. History textbooks for elementary schools issued by the Ministry of Education of Japan for the first time were `A Brief History (史略)`. As history textbooks were described realistically those times, Japanese emperors were not an object of worship. From the 1880s, the Japanese government`s centralism and intervention brought about control of a textbook system. Japanese textbook system shifted from the return system to the authorization system. In the 1890s history textbooks authorized by the Japanese government were published, but they were not distorted as politically as in recent times. Between 1886 and 1903 the purpose of history education is to make students understand the structure of the country and to strengthen the people`s nationalism. Under the textbook authorization system a portrait of Jinmu the Emperor (神武天皇) appeared in history textbooks, and it gave a strong image to Japanese people of the period of Meiji(明治). For about 40 years from `Textbook Graft Scandal` in 1902, the government-issued textbook system was established in Japan. In this period the Japanese government published seven history textbooks with six of them in the period of Militarism and one of them in the period of the U.S. military rule. The history textbooks showed Japanese militarism represented by a slogan `We are willing to die just for the Emperor.` From 1953 to today the Ministry of Education of Japan has adopted textbook authorization system again. There have been history distortions in textbooks such as a slanted textbook of social studies in 1955, Ienaga textbook trial in 1965, and the distortion of textbooks of Japanese history in 1982 and 1986 which were revised because of a strong protest of Korea and China. In 2001 `New History Textbook` authorized by the Ministry of Education of Japan which included severely distorted history caused a great sensation. In recent times history textbooks of Japan are inclined to describe distorted history with the rebirth of militarism. Although Japan says its history textbooks are described from the viewpoint of Japan and Japanese emperors, the question whether they are described from the perspective of people in general and the world history is being raised. History textbooks of Japan under the government-issued textbook system had an absolute authority because they were used as a common material in history education all over the country, and had a great influence on forming Japanese people`s thought because the content of the textbooks was taught as a truth.

일본의 교과서 검정과 중학교 역사교과서 왜곡

李忠浩(Lee Choong Ho) 역사실학회 2001 역사와실학 Vol.19·20 No.-

The text books set to be used in April 2002, were inspected based on the New Teaching Method outlined by Japan′s Ministry of Education. The inspection started in April 2000 and the results were announced by the Minister of Education and Science on the 3rd of April, 200l. This inspection process has attracted the attention of the world concerning the Japanese middle school history book problem. Korea and China, amongst many other Asian nations, have voiced their concerns and have strongly demanded changes in historically inaccurate aspects of the government inspection. Korea, has demanded 35 corrections(China has demanded 8). Of the 7 publishing companies that were registered for inspection, Husosha was added. Of the 8 publishing companies that were under inspection by the ministry of education and science, all 8 qualified to be used as textbooks. These 8 textbooks that passed inspection were displayed at exhibitions all across the country that started in June 200l. The exhibitions lasted until August 15th, where textbooks were selected by schools. The books are scheduled to be used starting April 2002. This paper has been centered around the Husosha′s ‘New History Textbooks’, which has been the main reason for many of the problems during the recent inspections. The expulsion of Japanese text books have started since 1982, and until now our government has responded strongly and has expressed the feelings of our nation thoroughly. However this time our government has been unable to change the minds of the Japanese government. Our demands were rejected just two months after our government requested changes be made in the Japanese textbooks. Although there were no more ways to deal with the Japanese government, out of the eight textbooks that various schools had selected, only 0.03% of Husosha′s books were selected. A far cry from the 10% that Husosha had been expecting. That means out of 4.1 million Japanese middle school students, only 1200 students will be learning from Husosha′s book. The following is the series of events that has preceeded the present situation concerning the inspection of Japanese history texts. After 1982, when inaccurate aspects of Korean history in Japanese textbooks were brought to our attention, the Korean Education Development Center has organized campaigns to give the world a more accurate view of Korean history. However the recent inspections have made us realize that these efforts are not enough to change the fundamental problems concerning distorted Japanese textbooks. What were the standards that the ministry of education and science used during the textbook inspections? They used the ‘New Teaching Method’(scheduled to be in use in the year 2002) during the inspection of middle school text books. The inspection process: Each publishing company registers a draft for inspection → an inspector from the ministry of education and science investigates → there is a Textbook Screening Investigations Review Board evaluation→ Judgement(Pass/non-Pass). When an adjustment is needed: The publishing company turns in adjustment papers according to the results of the inspection → Re-evaluation → Judgement (Pass/non-Pass) → Final ruling by the Ministry of Education and Science However, in order to pass Husosha′s book, the Ministry of Education and Science demanded a large amount of adjustments. There was even a case where there were three adjustment processes that were carried out just in order to qualify Husosha′s book Due to this incident, the announcement of the inspection results was delayed for a month, Furthermore, classified information concerning the screening process was deliberately released by the cabinet office. This proves that there had been an effort by the Japanese government to pass books from specific publishing companies from official inspection and screening. Then what are the problems concerning Husosha′s ‘New History Book’? The contents can be