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이호영(Ho-Young Lee),박철우(Chul-Woo Park),손재환(Jae-Hwan Son),이달식(Dal-Sik Lee),이준두(Jun-Du Lee) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6월
In these days, the high speed and high precision machine tools have been widely applied to manufacture a die and machine elements product in industry filed according to increasing the need of high quality products. Therefore it is very important to evaluate the performance of machining center. In this paper, the methods of the evaluation tests of the geometric accuracy and the motion accuracy for machining center are studied with Korea Standards(KS).
이승호 ( Seung Ho Lee ),이달식 ( Dal Sik Lee ),유일영 ( Il Young You ),전원중 ( Won Joong Jeon ),박선미 ( Seon Mee Park ),윤세진 ( Sei Jin Youn ),최재운 ( Jae Woon Choi ),성노현 ( Ro Hyun Sung ) 대한소화기학회 2010 대한소화기학회지 Vol.55 No.2
목적: 담낭 선종에서 암종으로 진행 여부를 알아보기 위해 담낭 절제술을 시행한 검체에서 담낭 선종과 선종 연관병변의 조직학적 특징을 조사하였다. 대상 및 방법: 1,847예의 담낭절제술을 받은 환자에서 담낭 선종 26예, 상피내암 9예, 침윤성 선암 28예를 포함한 63예의 담낭 절제 조직을 대상으로 하였다. 한 명의 병리 의사가 선종과 선종의 바탕 위에 국소적인 악성화 혹은 선암에서 발견되는 선종 잔류조직 등 선종 연관 병변을 조사하였다. 담낭 선종은 형태학적으로 관형, 관유두형, 유두형으로 분류하고, 구성하는 표피세포에 따라 담상피, 위상피화생, 장상피화생으로 분류하였다. 양성 선종과 암성 선종에서 환자의 나이와 병변의 크기를 비교하였다. 결과: 전체 담낭 절제술에서 선종 연관병변은 1.8%에서 발견되었다. 상피내암 9예와 침윤성 암종 28예 중에서 선종 연관 병변은 각각 7예, 1예가 있었다. 선종에 동반된 암종 8예는 모두 고분화암이었고, 단일 병변이었다. 암성 선종은 양성 선종에 비하여 종양의 장경이 컸고(1.8 cm 대 0.9 cm, p=0.01), 환자들의 나이가 많았지만 통계적인 차이는 없었다(57세 대 47세, p=0.09). 선종을 구성하는 상피 세포 및 형태학적 분류에 따라 양성 선종 혹은 암성선종의 빈도는 차이가 없었다. 담낭 선종에서 악성 변화를 보인 선종은 23.5%였다. 결론: 담낭 선종은 드문 질환이나 악성화 진행은 자주 발견되었다. 암성 선종은 상피내암이 많고, 고분화암이며, 단일 병변이었다. 담낭 선종은 전암성 병변으로 담낭 선종-선암 연속은 담낭암 병인 중의 하나로 생각한다. Background/Aims: In order to determine the malignant potential of gallbladder adenoma for progression to carcinoma, we evaluated the histopathologic features of adenoma and adenoma-related lesions on cholecystectomized specimens. Methods: Among 1,847 cholecystectomized specimens, 63 specimens from 26 benign adenomas, 9 carcinomas in situ (CIS), and 28 invasive carcinomas were selected. A pathologist reviewed all specimens and selected benign adenomas, CIS in the adenoma, and adenoma residue in invasive carcinomas. Adenomas and adenoma- related lesions were classified according to morphology (tubular, tubulopapillary, and papillary) and the consisting epithelium (biliary, pyloric metaplasia, and intestinal metaplasia). The age and the size of the benign adenomas and carcinomas in the adenoma were also compared. Results: Adenoma and adenoma-related lesions were found in 34 out (1.8%) of all resected gallbladder. Among 9 CIS and 28 invasive carcinomas, adenoma-related lesions were detected in 7 and 1 case, respectively. All eight carcinomas arising in the adenoma were well-differentiated solitary tumors. The diameters of the carcinomas in the adenoma were, on average, larger than that of the benign adenomas (1.8 cm vs. 0.9 cm, p=0.01). The patients with carcinomas in the adenoma were, on average, older than those with benign adenomas, although the difference was insignificant (57 years vs. 47 years, p=0.09). The morphology and consisting epithelium did not differ between the benign adenomas and carcinomas in the adenoma. The malignant transformation occurred in 23.5% of adenomas. Conclusions: Gallbladder adenoma is a rare disease, although malignant transformation occurs frequently. Adenoma is a precancerous lesion and the adenoma-carcinoma sequence is one of the gallbladder cancer carcinogenesis. (Korean J Gastroenterol 2010;55: 119-126)
이호영(Ho-Young Lee),박철우(Chul-Woo Park),손재환(Jae-Hwan Son),이달식(Dal-Sik Lee),이준두(Jun-Du Lee) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6
In these days, the high speed and high precision machine tools have been widely applied to manufacture a die and machine elements product in industry filed according to increasing the need of high quality products. Therefore it is very important to evaluate the performance of machining center. In this paper, the methods of the evaluation tests of the geometric accuracy and the motion accuracy for machining center are studied with Korea Standards(KS).
이호영(Ho-Young Lee),최현진(Hyun-Jin Choi),손재환(Jae-Hwan Son),이달식(Dal-Sik Lee) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.5
Machine tool errors have to be characterized and predicted to improve machine tool accuracy. Therefore, it is very important to assess errors in machine tools. Volumetric error analysis has been developed by many researchers. This paper presents a useful technique for analyzing the volumetric errors in machine tools using the ball bar. The volumetric error model is proposed in specific vertical machining center and the program is developed for generating NC code, acquiring the ball bar data, and analyzing the volumetric errors. The developed system assesses the volumetric errors such as positional, straightness, squareness, and back lash. Also this system analyzes the dynamic performance such as servo gain mismatch. The radial data acquired by ball bar on 3D space is used for analyzing these errors. It is convenient to test the volumetric errors on 3D space because all errors are calculated at once. The developed system has been tested using an actual vertical machining center.
최현진(Hyun-Jin Choi),박철휴(Chul-Hue Park),이달식(Dal-Sik Lee),고영훈(Young-Hoon Koh),이태호(Tea-Ho Lee) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6월
In these days, It is necessary to develop the cutting machine satisfied the needs of IT component industry according to the growth of the mold industry. This paper is the introduction of the roadmap and the component technologies in "Development of high-speed and intelligent machine tools used for cutting mold" that has developed from December 2008.
최현진(Hyun-Jin Choi),박철휴(Chul-Hue Park),이달식(Dal-Sik Lee),고영훈(Young-Hoon Koh),이태호(Tea-Ho Lee) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6
In these days, It is necessary to develop the cutting machine satisfied the needs of IT component industry according to the growth of the mold industry. This paper is the introduction of the roadmap and the component technologies in "Development of high-speed and intelligent machine tools used for cutting mold" that has developed from December 2008.
최성대(Seong Dae Choi),김기만(Gi Man Kim),김잠규(Jam Kyu Kim),허빈(Bin Xu),김종환(Jong Hwan Kim),이달식(Dal Sik Lee) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6
The vibrating situation of machining center is natural during operating it. If it is possible that you are understanding in theory of mechanism about vibrating situation of machining center and get the hang of vibrating aspect through analysis and control it. It will be very useful for the improved stability and high-speed in operating a machining center for developing productivity.
최성대(Seong Dae Choi),김기만(Gi Man Kim),김잠규(Jam Kyu Kim),허빈(Bin Xu),김종환(Jong Hwan Kim),이달식(Dal Sik Lee) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6월
The vibrating situation of machining center is natural during operating it. If it is possible that you are understanding in theory of mechanism about vibrating situation of machining center and get the hang of vibrating aspect through analysis and control it. It will be very useful for the improved stability and high-speed in operating a machining center for developing productivity.
홍종필(Jong-Pil Hong),공병채(Byeong-Chae Gong),최성대(Sung-Dae Choi),최현진(Hyun-Jin Choi),이달식(Dal-Sik Lee) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.5
This study covers the optimum design of the 5-axis machine tool. In addition, the intelligent control secures structural stability through the optimum design of the structure of the 5-axis machine center, main spindle, and the tilting index table. The big requirement, like above, ultimately leads to speed-up operation. And this is inevitable to understand the vibration phenomenon and its related mechanical phenomenon in terms of productivity and its accuracy. In general, the productivity is correlated with the operation speed and it has become bigger by its vibration scale and the operation speed so far. Vibration phenomenon and its heat-transformation of the machine is naturally occurred during the operation. If these entire machinery phenomenons are interpreted through the constructive understanding and the interpretation of the naturally produced vibration and heat-transformation, it would be very useful to improve the rapidity and its stability of the machine operation indeed. In this dissertation, the problems of structure through heating, stability, dynamic aspect and safety about intelligent 5-wheel machine tool are discovered to examine. All these discoveries are applied to the structure in order to enhance the density of it. It aims to improve the stability.