• 제목/요약/키워드: continuous joint

검색결과 379건 처리시간 0.022초

동-스테인리스강 브레이징 접합부의 계면 조직과 접합 강도에 관한 연구 (A Study on the Interfacial Structure and Shear Strength of Cu/Stainless Steel Brazed Joint)

  • 박종혁;이우천;강춘식
    • Journal of Welding and Joining
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    • 제12권3호
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    • pp.48-55
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    • 1994
  • In this experiment, to find optimum brazing conditions for Cu/Stainless Steel brazing using filler metals of Ag-Cu-Zn-Cd system, first of all spreading ratio was tested on 304 stainless Steel and low carbon steel. And then shear test of brazed joint was executed. As the result of that, the shear strengths of brazed joints were the range of 60-90 MPa. Through microstructure analysis for brazed interface layer, We found as follows. Firstly interface layer increased as time increased. Secondly continuous layer of Ag-Cd compound was observed along the side of stainless steel. Also by means of EDS analysis for fracture surface, ductile fracture was occurred and precipitates on the fracture surface were found to include Cr, Mn, Si in Ag-rich phase.

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이동식 플래시 버트 용접의 효과 (The effect of Mobile Flash Butt Welding)

  • 김준식;이종수;이학규;이중권;이지하
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2004년도 추계학술대회 논문집
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    • pp.793-799
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    • 2004
  • In track a third weakness point is joint part, turnout part, curve part. One of them joint part of rail have been known to the most weak point by loosen of joint bar and fish bolt due to impulse and vibration by wheel contact at times. In addition happen to deformation and failure at end of rail, failure and miniature of ballast gravel. Finally impact between wheel and rail become origin cause of a welded rail, noise and vibration. riding condition deterioration, besides track failure. In the present domestic, Thermite and Gas pressure weldings have been used to continuous welded rail(CWR), however stiffness and confidence in quality is lower than Flash butt welding method. FRW have the excellent capacity, however have a shortcoming large scale of machine and power equipment. Therefore we will introduce Mobile Flash Butt Welder can weld in track.

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CWS공법(Buried Wale Continuous Wall System)을 적용한 Up-Up 시공사례 (Field Application of Up-Up Construction Using Buried Wale Continuous Walt System Method)

  • 이정배;임인식;김동현;오보환;하인호;임홍철
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2006년도 춘계학술논문 발표대회 제6권1호
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    • pp.1-4
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    • 2006
  • A down construction method is frequently used in these days to reduce popular discontent and to assure sufficient working space at early stage in downtown area. There are two main problems in the existing down construction method. One is a confliction between frame works and excavation works, and the other is a cold joint in retaining wall which is unavoidable due to a sequence of concrete placement and induces a water leakage. Therefore, a new method is needed to overcome these problems. The CWS (buried wale Continuous Wall System) method was developed by authors. By replacing RC perimeter beam with embedded steel wale, the steel frame works of substructure can be simplified and the water leakage can be prevented using continuous retaining wall. Consequently, the improved duality and reduction of construction period can be obtained from CWS method.

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CWS공법(buried wale Continuous Wall System)의 개발에 관한 연구 (Study on Development of CWS (buried wale Continuous Wall System) Method)

  • 이정배;임인식;천성철;오보환;하인호;임홍철
    • 한국건축시공학회지
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    • 제6권2호
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    • pp.81-89
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    • 2006
  • A down construction method is frequently used in these days to reduce popular discontent and to assure sufficient working space at early stage in downtown area. There are two main problems in the existing down construction method. One is a confliction between frame works and excavation works, and the other is a cold joint in retaining wall which is unavoidable due to a sequence of concrete placement and induces a water leakage. Therefore, a new method is needed to overcome these problems. The CWS (buried wale Continuous Wall System) method was developed by authors. By replacing RC perimeter beam with embedded steel wale, the steel frame works of substructure can be simplified and the water leakage can be prevented using continuous retaining wall. Consequently, the improved qualify and reduction of construction period can be obtained from CWS method.

저탄소강 SS41 연속파형 Nd:YAG 레이저 겹치기 용접의 기공제어 기술 (The Porosity Control Technology of Lap Joint Welding Using Continuous Wave Nd:YAG Laser of the Low Carbon Steel SS41)

  • 이가람;황찬연;양윤석;박은경;유영태
    • 한국생산제조학회지
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    • 제22권4호
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    • pp.665-672
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    • 2013
  • With the development of advanced processing technology, laser processing systems, which require high-quality precision processing, have attracted considerable attention. Although laser equipment is expensive, it enables quick processing and less deformation of materials. This technology is often applied to secondary batteries, which has thus farinvolved the use of argon tungsten inert gas (TIG) welding. However, the welding characteristics of argon TIG welding are not yet good, and a laser is used for welding to address this problem. In this study, lap-joint welding was conducted, and the desired welding characteristics were obtained when the laser power was 1800W and the laser beam travel speed was 1.8 m/min. Lap-joint welding was conducted on Ni-coated SS41. Two cases were compared. No pores were observed in the Ni-coated SS41 lap-joint welding part, and cracks appeared from the lap-joints. Moreover, the pole rod and tap were welded together in a T-joint form to improve the output of the secondary battery. T-joint laser welding showed better welding characteristics than TIG welding.

주요 사례 분석을 통한 한·중·일 공동어업관리 방향 (Korea-China-Japan Joint Fisheries Resources Management through Case Study)

  • 이광남;서병귀
    • 수산해양교육연구
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    • 제19권1호
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    • pp.53-73
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    • 2007
  • There exists historically intimate relationship between the fisheries of the three countries of Northeast Asia in terms of the same fishing ground and similar resources. This means that if one of the countries fail to manage their fisheries properly, it will harm the others. Especially, if the EEZ straddling and Trans-Boundary Fish Stocks aren't managed by the cooperation of the three countries, the exhaustion of resources will be more likely to be accelerated. Considering the aspects mentioned, this paper refers to the necessity of fisheries cooperation between Korea, China, and Japan. Next, it analyzed the joint control cases of Norway/Russia Management of Shared Fish Stocks in the Barents Sea, Management of South Tasman Rise in Orange roughy, Agreement on Fisheries between the European Economic Community and the Kingdom of Norway, Conservation and management of pollack resources in the central Bering Sea, and drew a conclusion for ourselves. Last of all, it suggests a step-by-step strategy of promoting joint control between three countries, and the plan of the establishing and managing the organization of joint fisheries control. About the joint control, "The Joint Statement of promoting collaboration between Korea, China, and Japan" has been announced at ASEAN in October 7th, 2003 and the summit talk of the three countries. In the joint statement, the three countries came to an agreement which says, "Cooperation in Fishery Resource Conservation : The three countries will cooperate, bilaterally or trilaterally, to promote the sustainable use and conservation of fishery resource through the effective fishery management". Not only the consistent collaboration between the government is necessary, but also continuous exchange and related study on a Non-governmental level is also needed for the viable outcome in the near future. When deducting the result for the joint fisheries control, this writer hopes the contents of this study will be helpful.

빈곤과 비행 발달궤적의 역동적 관계 (Dynamic Relationships of Poverty and Delinquency Trajectories)

  • 정익중
    • 아동학회지
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    • 제30권3호
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    • pp.113-125
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    • 2009
  • This study advances knowledge of developmental patterns in poverty and delinquency; data was obtained from waves 1-5 (2003-2007) of the Korea Youth Panel Survey. Semi-parametric group-based modeling (SGM) identified 4 trajectories of poverty from age 13 to 17 : non-poor, poverty increasing, low-level continuous poverty and chronic poverty groups and five developmental trajectories of delinquency : non-offending, late onset, low-level continuous, desisting, and chronic groups. A joint trajectory method predicted patterns of delinquency conditional on poverty trajectories. Chronic and low-level continuous poverty groups were more likely than others to follow chronic trajectories of delinquency; the non-poor group was more likely to be non-offending. Implications of this study for youth welfare were discussed to reduce risk for delinquency.

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Nonlinear Dynamic Analysis of a Large Deformable Beam Using Absolute Nodal Coordinates

  • Jong-Hwi;Il-Ho;Tae-Won
    • International Journal of Precision Engineering and Manufacturing
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    • 제5권4호
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    • pp.50-60
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    • 2004
  • A very flexible beam can be used to model various types of continuous mechanical parts such as cables and wires. In this paper, the dynamic properties of a very flexible beam, included in a multibody system, are analyzed using absolute nodal coordinates formulation, which is based on finite element procedures, and the general continuum mechanics theory to represent the elastic forces. In order to consider the dynamic interaction between a continuous large deformable beam and a rigid multibody system, a combined system equations of motion is derived by adopting absolute nodal coordinates and rigid body coordinates. Using the derived system equation, a computation method for the dynamic stress during flexible multibody simulation is presented based on Euler-Bernoulli beam theory, and its reliability is verified by a commercial program NASTRAN. This method is significant in that the structural and multibody dynamics models can be unified into one numerical system. In addition, to analyze a multibody system including a very flexible beam, formulations for the sliding joint between a very deformable beam and a rigid body are derived using a non-generalized coordinate, which has no inertia or forces associated with it. In particular, a very flexible catenary cable on which a multibody system moves along its length is presented as a numerical example.

반복적인 프리엠블을 이용한 반송파 및 심볼 타이밍 동시 복원 (Joint Carrier and Symbol Timing Recovery Using Repetitive Preamble)

  • 오성근;황병대
    • 한국통신학회논문지
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    • 제25권8B호
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    • pp.1436-1444
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    • 2000
  • 본 논문에서는 버스트 모뎀에서 반복적인 프리엠블(preamble)과 차등 검출 방식을 이용하여 반송파와 타이밍을 동시에 복원하는 동기 검출 알고리즘을 제안한다 제안된 방식은 짧은 길이의 프리엠블과 낮은 SNR(signal-to-noise ratio)에서도 주파수 편차의 정도에 관계없이 주파수 편차와 심볼 타이밍 오차를 높은 정확도로 추정할 수 있으며 CPFSK(continuous phase frequency shift keying) 방식 및 PSK(phase shift keying) 유형의 방식에 적용이 된다 모의 실험을 통하여 제안된 동기 방식과 기존의 동기 방식들과의 방식들의 프리엠블의 길이에 따른 동기 검출 성능을 비교하고 비트 오류율에 미치는 영향을 분석한다.

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패션기업과 아티스트 간의 공동상품화를 위한 파트너쉽에 관한 연구 - 탐색적 요인분석, 구조방정식 모형분석을 중심으로 - (Partnerships for joint product development between fashion companies and artists - focusing on exploratory factor analysis and structure equation model analysis -)

  • 최소라;정성지;김동건
    • 한국의상디자인학회지
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    • 제21권1호
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    • pp.47-57
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    • 2019
  • The purpose of the study was to explore effective satisfaction factors for continuous partnerships between fashion companies and artists. A questionnaire was developed by the researchers and results were collected from a total of 273 people who were working for a fashion company or working as an artist. Data was analyzed by the use of a frequency test, a reliability test, an exploratory factor analysis and a structure equation model analysis using AMOS 18.0. The results of the study were as follow. First, profitability and adequacy had significant effects, but awareness had no effect on confidence concerning the partnership. Second, awareness and profitability showed significant effects, but adequacy showed no effect on the flow among those in the partnership. Third, confidence had a significant effect on flow. Fourth, among the partnership factors, confidence and flow had significant effects on partnership satisfaction. Fifth, flow showed a significant effect on the intent for a continuous partnership, but confidence showed no effect.