http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Drilling Characteristics of PVC Materials
J.Y Byun(변재영),Na-Ram Park(박나람),S.W Chung(정성원),S.H Kwon(권순홍),S.G Kwon(권순구),J.M Park(박종민),J.S Kim(김종순),Won-Sik Choi(최원식) 한국기계가공학회 2015 한국기계가공학회지 Vol.14 No.1
This paper develops and evaluates a mechanical machining process which involves drilling on PVS material. According to the material, two treatment experiments were conducted, one involving drilling in a wet condition or using a lubricant and one involving drilling in a dry condition with no lubricant. Drilling in a dry condition showed better performance in terms of the cutting time than in the wet condition. Otherwise, the wet condition has several advantages. The lubricant influenced the burr diameter size and minimized the temperature on the surface of the work piece. During the wet condition drilling process, a smaller burr diameter size was noted as compared to the dry condition. The temperature showed a linear correlation with the drill bit size, where a least-square analysis provided an R<SUP>2</SUP>valuewhichexceeded 0.95. The wet condition required more cutting time than the dry condition. In this condition, the water provides a lubrication effect. A thin layer between the cutting edges and the surface of the work piece is formed. The chip formation is affected by the drilling depth. The color on the tips of the chips was darker than in the initial condition. No correlation between the drilling depth and the bore roughness was noted, but the variation of the cutting speed or the RPM influenced the roughness of the bore. The optimum cutting speed ranged from 40 RPM to 45 RPM in the condition which provided the finest roughness surface.
논문 : 생물생산시설 및 환경공학 ; 가시광 감응형 광촉매에 의한 수경재배용 배양액의 재이용 살균시스템 개발(1) -광촉매 필터 요인시험-
정성원 ( S. W. Chung ),하유신 ( Y. S. Ha ),이종원 ( J. W. Lee ),박종민 ( J. M. Park ),권순홍 ( S. H. Kwon ),이기명 ( K. M. Lee ) 한국농업기계학회 2010 바이오시스템공학 Vol.35 No.6
We produced a basic system of sterilization of nutrient solution based on the characteristics of coated filter with the visible light-reactive titanium oxide photocatalyst according to the findings of the first stage. We developed a model system with a proper number and arrangement of filter elements, the visible light-reactive titanium oxide photocatalyst according to findings from the basic performance test. Main results of this study were as followers; The ceramic filters showed the best performance of sterilization of nutrient solution. The visible light-reactive titanium oxide photocatalyst sterilized more effectively the nutrient solution under the sunlight than UV light. The sterilization performance by passing repeatedly through a few filter was more efficient than that by treating simultaneously with a large number of filters. The filter with 15ppi in pore size, 20 mm in thickness, and 3 layers in titanium oxide coating was desirable in the intensity and sterilization performance.
다중 싱크 센서 네트워크에서의 라이프타임 연장을 위한 에너지 효율적인 싱크 선택 기법
박진효(Jinhyo Park),정재탁(J.T Chung),정성원(S.W Chung),한기준(Kijun Han) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.2D
기존 single sink 센서 네트워크에서의 모든 센서 노드들은 sink로부터 flooding된 질의(query)를 전송 받은 후 센싱 data를 sink로 보냄에 있어서 목적지인 sink 주변 노드의 traffic 집중에 따른 에너지 소비로 인해 전체 네트워크 수명에 영향을 끼쳤다. 이러한 single sink 방식에서의 주변 노드의overhead와 센싱 데이터를 sink로 전달 할 때의 특정 경로상의 노드들의 잔여 에너지량을 고려하여 데이터를 전송하게 함으로써 전체 네트워크 수명을 연장 할 수 있다.