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주동원(Joo, Dong Won),김정수(Kim, Jung Soo) 대한토목학회 2021 대한토목학회논문집 Vol.41 No.4
밀집이 심한 도시는 불투수 면적이 많아 흘러나온 빗물이 빠르게 도로를 타고 한쪽으로 모이게 된다. 이는 도로에 설치된 빗물받이로 차집이 되지 못한 많은 노면 유출수로 인해 측구에서의 흐름 폭이 넓어져 정체 노면수를 증가시켜 교통체증과 미끄러움으로 인한 사고를 유발한다. 이에 본 연구에서는 차집유량 산정식을 제시하기 위해서 간선도로와 고속도로의 최대 종경사를 반영하여 2~10 %의 도로 조건을 반영하였고, 측구횡경사는 일반도로 횡경사인 2 %를 선정하였다. 도로 차선조건은 중앙차선과 보도를 경계를 2, 3, 4 차선을 선정하였으며, 실험유량은 설계 빈도 상황을 고려하여 실제 도로 조건의 5년, 10년, 20년, 30년의 설계빈도 유수유출량을 실험유량으로 환산한 결과 1.36 l/s~3.96 l/s의 유량을 10개로 나누어 수리실험을 진행하였다. 또한, 측구로 들어오는 유입유속과, 흐름 폭을 고려한 식을 제시하였다. 실험 결과 종경사 증가에 따라 흐름 폭은 증가하고, 차집율은 감소하는 경향을 보였다. 이에 본 연구에서는 IBM SPSS Statistics 24 프로그램으로 회귀분석하여 설계빈도에 따른 우수 유출량, 도로의 종경사를 반영한 흐름 폭과 유입유속의 빗물받이 차집유량 산정식을 도출하였다. 산정된 도출식은 도로에서의 빗물받이 설계에 기초자료로 활용될 것으로 판단된다. In dense cities, which are covered by many impermeable areas, rainwater flows quickly along the roads and collects in certain areas. The surface runoff that fails to get intercepted by the roadside rain gutters results in a wider flow of water along the sides, which in turn increases the amount of water on the road and causes traffic congestion as well as accidents due to slippage. Based on these issues, this study was carried out in order to propose an intercepted flow calculation formula. To this end, the maximum longitudinal slopes of arterial roads and expressways were reflected to depict a road condition of 2~10 %, while a general traverse slope of 2 % was selected for the traverse slope on the side. As for the road lane condition, two, three, and four lanes were chosen for the area from the centerline to the sidewalk. As for the experimental flow rate, the rainwater runoffs at the actual design frequency of 5, 10, 20, and 30 years for road conditions were converted into experimental flow rates, and as a result, flow rates ranging from 1.36 l/s to 3.96 l/s were divided into ten flow rates for a hydraulic experiment. Also, an equation taking into consideration the inflow velocity and flow width along the roadsides was proposed. The results of the experiment showed an increase in flow width and a decrease in interception rate. Also, the inflow velocity at a traverse slope of 2 % was measured, while increasing the longitudinal slope. Accordingly, an equation for calculating the flow intercepted by rain gutters at a flow width reflecting the longitudinal slope of the road and rainwater runoff, according to the design frequency, was derived by performing a regression analysis using IBM SPSS Statistics 24. It is deemed that the equation derived in this study will be useful in designing rain gutters for roads.
주동원(Dong Won Joo),구광덕(Kwang Duk Koo),성장현(Jang Hyun Sung) 대한금속재료학회(구 대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.12
To investigate the applicability of a coarse powder to the metal injection molding, coarse iron podwers were combined up to 60% in weight fraction with fine iron powders in the injection molding process. With increasing relative fraction of a coarse powder, the green density of the compacts increased slowly up to 97% at 60 wt. % addition of coarse powder and it became possible to remove a binder completely out of the compact through the broader channels of binder flow during the debinding stage. The increase in the porosity of the compact owing to the increasing portion of a coarse powder resulted in the decrease in the sintered density and volume shrinkage. And then it brought the tensile strength and elongation of the final product down. In this experiment the maximum amount of a coarse powder replacing a fine powder with the equivalence in densification behavior, microstructure and tensile property to injection molded-fine carbonyl iron powder was found to be 20% in weight fraction.
M3/2계 고속도 공구강 분말의 소결분위기와 탄소첨가가 소결밀도에 미치는 영향
안진환,허종서,주동원,정은,성장현,Ahn, Jin-Hwan,Heo, Jong-Seo,Joo, Dong-Won,Jung, Eun,Sung, Jang-Hyun 한국분말야금학회 1998 한국분말재료학회지 (KPMI) Vol.5 No.4
For the purpose of investigating the effect of sintering atmosphere and carbon addition on sintered density and microstructural characteristics, the M3/2 grade high speed steel powders with the addition of carbon are sintered in vacuum and $20%H_2/79%N_2/l%CH_4$ gas atmosphere. With the addition of 0 wt%C, 0.45wt%C and 1.15 wt%C the optimum sintering temperatures decrease down to $1260^{\circ}C$, $1210^{\circ}C$ and $1150^{\circ}C$ respectively for the vacuum sintered specimen, and also decrease down to $1130^{\circ}C$, $1120^{\circ}C$ and $1115^{\circ}C$ for the gas sintered specimen. The threshold temperatures for full densification decrease steeply with increasing carbon content of the sintered specimen, while this temperatures are slowly decreased at high carbon content. The vacuum sintered specimen shows the primary carbides of MC and $M_6C$ type at the optimum sintering temperature, and eutectic carbides of $M_2C$ and Fe-Cr type are produced in the oversintered specimen. The gas sintered specimen exhibits M6C and Fe-Cr type primary carbides at the optimum sintering temperature. The eutectic carbides of $M_6C$ and Fe-Cr type and MX type carbonitride are shown for the oversintered specimen in the gas atmosphere. The hardness of gas sintered specimen shows high value of 830-860 Hv due to the increment of carbide precipitation.
문서 구조 기반 대용량 뉴스 기사의 감성 레이블 자동 생성
진훈(Hoon JIN),주동원(Dong-Won Joo) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.11
Applying machine learning techniques to large volumes of text at the big data level requires a large amount of training data and several studies are being introduced to create automatic (or semi-automatic) machines. In this paper, we devise and develop a technique for automatically labeling large-volume online news articles produced by hundreds of media in Korea. From the experimental results, we could find that the accuracy of the predicted results is more than 92%.
2상 스테인리스강의 인장특성에 미치는 오스테나이트상의 함량 및 합금원소의 영향
주동원,성장현,이성근 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
The effect of alloying elements addition, austenite content and distributions on the tensile properties and corrosion resistance of duplex and super duplex stainless steels has been investigated by changing heat treatment conditions. With the addition of N and Cu, the austenite content of duplex stainless steels increased. After heat treating the super duplex stainless steel, the austenite content increased above 1200℃ and the ferrite single phase temperature shifted to 50℃ high in comparison to duplex stainless steel. Due to the stored energy induced from cold rolling the super duplex stainless steel. the specimen with fibous structure showed to be increased in austenite content compared to the specimen with dispersed structure. Tensile strengths decreased and elongations increased with increasing austenite content. The super duplex stainless steel with fibrous structure showed superior tensile strengths and elongations to the fibrous duplex stainless steel and super duplex stainless steel with dispered structure. The effect of Cu and CU+W addition on tensile properties was small. The passive current density and critical current density of high alloyed super duplex stainless steel showed value in comparison to duplex stainless steel. The Cu+W added super duplex stainless steel appeared the highest corrosion resistance among all specimens.