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마이크로 드릴에 의한 구멍 가공시 드릴의 손상과 구멍의 관찰
배명일 한국기계기술학회 2016 한국기계기술학회지 Vol.18 No.4
In this study, i machined micro hole to PCB(Printed circuit board) with ultra precision spindle system for mechanical micro drilling. For this i utilized 0.4∼0.6 ㎜ micro drill and observed cutting edge and hole. Results are as follows; in case of drilling with 0.4∼0.6 ㎜ micro drill, micro hole was made specific range of diameter up to 300 times drilling and micro drilled diameter was bigger than micro drill’s diameter at 300 times over. Error ratio of drilled diameter and damaged hole diameter was within 5 % and 17 %. I observed 0.4 ㎜and 0.6 ㎜micro drill’s cutting edge after 500 times drilling and confirm cutting edge width variation and damage, same result found 1000 times drilling with 0.5 ㎜ micro drill.
PCB 드릴링용 스핀들을 위한 공기 베어링의 최적 설계에 관한 연구
배명일,김형철,김기수 충남대학교 공업교육연구소 2001 論文集 Vol.24 No.1
In this study, the stiffnesses of aerostatic thrust and radial bearings for PCB drilling are analyzed using system of experiment. The results are as follows: the stiffnesses of aerostatic thrust bearing are affected by input air pressure, clearance, number of nozzle. Also, the stiffnesses of aerostatic radial bearing are affected by input air pressure, diameter of nozzle, length of bearing. A recommended design conditions for aerostatic thrust bearing are as follow: input air pressure 7kg_(f)/cm^(2), clearance 0.02mm, diameter of nozzle 0.2mm, number of nozzle 7, bearing inner diameter 26mm and input air pressure 7kg_(f)/cm^(2), clearance 0.015mm, diameter of nozzle 0.2mm, bearing length 45mm, distance of nozzles 10.5mm for aerostatic radial bearing.
기계구조용 탄소강(SM20C)의 단속절삭시 칩의 형상 및공구손상관찰
배명일 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.2
In interrupted cutting, the workpiece has a groove that impacts both the cutting tool and the workpiece. Therefore, cutting tool damage occurs rapidly. In this study, I performed interrupted cutting of carbon steel formachine structures (SM20C) using an uncoated carbide tool (SNMG120404, P20), and observed tool damage,cutting chip shape, and the workpiece surface. Results: Under the specific cutting conditions of feed rate = 0.066mm/rev, cutting speed = 120 m/min, and depth of cut = 0.1 mm; and feed rate = 0.105 mm/rev, cutting speed= 120 m/min, and depth of cut = 0.2 mm, the observed tool damage was small. Similar chip shape wasobserved (Expt. No. 1, 3, 7). Workpiece damage was observed (Expt. No. 3, 5, 7, 9). Key Words
통신 환경에서 비정형적 구조를 갖는 데이터세트의 효과적인 제어 방법
배명남,최완,이동춘,Bae, Myung-Nam,Choi, Wan,Lee, Dong-Chun 한국정보처리학회 2002 정보처리학회논문지 C : 정보통신,정보보안 Vol.9 No.1
교환기 시스템(Switching System)과 같은 통신 시스템에서는 제안된 이벤트들이 반드시 명시된 시간 제약 내에 완료되어야 한다. 따라서, 시스템에 유지되는 응용 데이터들은 빠른 접근이 가능해야 하며, 동시에 제한된 시간 내에 이벤트의 완료가 보장되어야 한다. 현재, 많은 데이터 시스템들이 사용되고 있지만, 이들은 정형화된 구조와 이에 대한 기본적인 연산들만을 제공하고 있다. 최근 통신 응용에서 데이터의 복잡성이 증가함으로서, 기존의 방식과는 달리, 비정형화된 구조의 표현이 가능하며, 이들에 대해 쉽게 접근 가능한 체계가 요구되고 있다. 이를 위해, 본 논문에서는 비정형화된 다중 응용 환경의 모델링에 적합한 데이터 모델을 소개한다. 모델은 데이터세트에 대한 빠른 접근과 필요한 데이터를 쉽게 추출할 수 있는 체계를 제공한다 추가로, 모델의 특징을 명확히 하기 위해 몇몇 세부 알고리즘을 함께 설명한다. Communication systems, such as Switching System, are operated in the restricted conditions that the suggested events must finish in the time-constraints. Therefore, the data in the systems requires not only rapid access time, but also completion in the restricted time. Many existing data systems have been developed and used in the communication environments. But, the system construct a structural scheme and provide users with basic data services only. In recent, as the complexity of data in the communication area is rapidly increasing, it requires the data system which can represent the unstructured dataset and complete the data access in this dataset on the restricted condition. In this paper, we propose the data model which is suitable to the unstructured multi-dataset environment. The data model supports the rapid data access for unstructured dataset and enables users to easily retrieve data needed at the execution. In addition to, we define the several algorithms to clarify the structure of our model.
Mucosal Schwann-Cell Hamartoma Diagnosed by Using an Endoscopic Snare Polypectomy
배명남,이정은,배상묵,김은영,김은옥,정성훈,오정환,민기옥 대한대장항문학회 2013 Annals of Coloproctolgy Vol.29 No.3
Colorectal polyps of mesenchymal origin are a rare group of colorectal disorders. A ‘‘mucosal Schwann-cell hamartoma,”which is one type of polypoid lesion that originates from the mesenchyme, is a newly-proposed disease entity to be distinguished from the neurofibromas found in type-1 neurofibromatosis. This lesion is composed of pure Schwann-cell proliferation in the lamina propria and shows diffuse immunoreactivity for the S-100 protein. We report a case of a polypoid lesion of the colon with the features of this recently-proposed disease entity.