• Annual Conference of KIPS
• /
• 2002.11b
• /
• pp.1475-1478
• /
• 2002

멀티캐스트는 현재 일-대-일 통신서비스로 부터 일-대-다 또는 다-대-다 통신서비스에서 신뢰성을 요구하는 새로운 요구가 많아지고 있다. 그리고 최근 대두되고 있는 멀티미디어 응용을 지원하기 위해서는 광대역 네트워크의 링크, 실시간 전송, 보나 효과적인 멀티캐스트 프로토콜이 요구된다. 그러나 DVMRP, MOSPF, CBT, PIM 구조의 멀티캐스팅 프로토콜은 단지 송수신의 패킷의 경로비용으로 라우터 자체의 근거리 알고리즘이 적용되기 때문에 멀티캐스트가 수행될 때 통신의 전반적 사항인 통신처리능력, 대역폭, QoS(quality of service)대한 능력이 부족하다. 그러므로 멀티미디어에서 사용되는 패킷의 계층적 특성이 제외된 상태로 데이터가 전송되는 단점이 있다. 본 연구에서는 액티브 네트워크를 이용해서 카 데이터 패킷 전송을 위한 공정하고 실용적인 대역폭 사용하고 대역폭과 데이터처리능력을 액티브 전송 패킷을 통해서 액티브 라우터로 전송된 데이터를 필터링 해서 보나 효과적인 멀티미디어 데이터 패킷을 카 계층에 따라 다양한 수신자가 데이터 패킷을 전송 받고 액티브 라우터로부터 공정한 대역폭 전송할 수 있는 라우터를 시뮬레이션 상에서 구현하고 성능을 평가한다.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2016.02a
• /
• pp.415.1-415.1
• /
• 2016

2009년도에 Perovskite가 태양전지에 처음 적용된 이후, Perovskite를 기반으로 하는 태양전지는 급속한 발전을 이루고 있으나, 향후 상용화를 위해서는 추가적인 공정개선 및 제조 단가를 낮추는 노력이 필수적이다. 초창기 Perovskite의 증착 공정은 One step deposition 방법이 사용되었으나, Layer의 thickness, uniformity 등을 조절하기 어려워 Sequential deposition 방법으로 개선되었다. 하지만 결과적으로 초기방법 대비 추가공정이 발생함에 따라 시간 및 비용의 증가가 불가피하였다. 제조단가 측면에서는 Perovskite 태양전지를 구성하는 재료 중 HTM(정공수송물질)을 구성하는 Spiro-MeOTAD의 비용이 가장 비싸다. 따라서 저비용 태양전지를 위해서는 HTM이 없는 구조가 필요하다. 이 페이퍼에서는 Perovskite 물질이 고흡광 능력 외에 충분한 전하수송능력을 보유한다는 점에 착안하여, Gas Pressure Assisted Modified One Step Deposition을 이용한 HTM Free Perovskite를 제작하고 기존의 Sequential Deposition Method 통해 만들어진 Perovskite 태양전지와 비교/분석하였다.

• Journal of Korean Society for Quality Management
• /
• v.27 no.2
• /
• pp.81-100
• /
• 1999

Process capability indexes are widely used in industries. Nevertheless, important statistical issues that deal with the appropriate use of process capability indexes have only appeared in the technical literature and are thus unknown to many users. In this paper we will first review various kinds of process capability indexes and then try to understand how much uncertainty is associated with them in relation to the assumption of normal distribution, the estimate of ${\sigma}$, the sampling error, the size of number of observations available and the presence of data correlation. Finally, we will propose a proper use of process capability indexes in an effort to assess a complex process.

• Journal of Venture Innovation
• /
• v.6 no.3
• /
• pp.203-220
• /
• 2023

This study conducted an empirical analysis of the factors affecting the job commitment of employees within a financial sales organization, focusing particularly on agile leadership and organizational justice. Agile leadership was subdivided into four components: adaptability, collaboration promotion, proficiency, and an agile approach, whereas organizational justice was broken down into distributive justice, procedural justice, and interactional justice. Data were gathered through an online survey, and 245 valid responses were subjected to hierarchical regression analysis. The results revealed a significant positive effect of distributive justice, interactional justice, adaptability, promotion of collaboration, and an agile approach on job commitment among the employees of the financial sales organization. However, the influence of proficiency, a component of agile leadership, and procedural justice, a dimension of organizational justice, did not prove to be statistically significant. The order of influence among the significant variables was found to be: adaptability, interactional justice, promotion of collaboration, distributive justice, and an agile approach. These findings confirmed the impact of agile leadership in financial sales organizations, traditionally viewed as conservative, and suggested practical implications for the financial sector to adapt in anticipation of the Fourth Industrial Revolution.

• Journal of the Korean Data and Information Science Society
• /
• v.20 no.3
• /
• pp.485-492
• /
• 2009

In this paper, we studied process capability analysis for brake-pad manufacturing system and considered Weibull, normal and logistic distributions for density estimation of wear life of brake pads for a passenger car with a real data. These three distributions are seem to work well. Estimated percentiles of brake pads can be used to evaluate the design criteria and customers' need for brake pads.

• Journal of Engineering Education Research
• /
• v.9 no.2
• /
• pp.71-81
• /
• 2006

In this paper, we present, based on a systematic job analysis, the definition, flowchart and description of Production Management Technician(PMT)'s job in Electronic Industry for developing an PMT education and training program in the context of Korea situation. The result of this study reveals that there are 3 duties and 22 tasks in the job of Production Management Technician, and 12 education contents and 6 education courses in the PMT curriculum.

• Journal of Korea Society of Industrial Information Systems
• /
• v.6 no.3
• /
• pp.65-70
• /
• 2001

This Paper Propose the control chart Pattern to provide a more comprehensive scheme for detecting process shifts using individual observations in start-up process. In this paper, which uses the backpropagation algorithm two samples are fed into the trained neural network to provide outputs ranging from 0 to 1. The main advantage of using neural networks approach with a control chart is that the neural network has almost no delay in detecting small shift. This paper illustrates how neural networks can provide a useful method for optimizing parameter(connection weights) that affect process control. Simulation results show that the performance of the proposed control chart using the neural network (NNCC) is quite promising.

• The Journal of the Korea Contents Association
• /
• v.12 no.5
• /
• pp.404-414
• /
• 2012

B2B2C distribution channel between travel agencies, the travel franchiser's fairness become a big issue. So this study examines the effects of B2B transaction fairness between travel agencies on relationship-orientation and travel franchisee's performance. The research results are as follows: First, the most influential factor on the franchisee's performance was found as relationship-orientation factor. Second, among the 3 variable factors of B2B transaction fairness, the most influential factor on the franchisee's relationship-orientation was found as interactional fairness. And procedural fairness was found as next. Third, distributive fairness and interactional fairness were found to have a significant effect on franchisee's financial performance. And distributive fairness and procedural fairness were found to have a significant effect on franchisee's non-financial competency. Conclusively, excellent employees of travel franchiser' are the most valuable factors in B2B2C transactions due to the nature of the travel industry where human services are valued above everything else.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.16 no.2
• /
• pp.952-962
• /
• 2015

In this study, multilayered rings with a large outer diameter have been developed using a hot ring rolling process. The ring rolling process has been analyzed by rigid plastic finite element analyses (FEA) using the AFDEX2D and AFDEX3D/HEXA/RING simulators, where the finite element meshes received severe plastic deformation are remeshed into a fine mesh-size using a dual-mesh system. According to the simulated results, the design variables of the multilayered rings were determined and real tests were conducted to check the validity of the simulation results. By adopting the hot ring rolling process, the input weight of raw materials was reduced by 40% against the conventional hot forging process and that the recovery rate was increased by 24%. The measurement of the averaged roundness was satisfied within 0.5 mm for both the inner and outer diameters. Moreover, the hot ring rolling processes yielded 1.49 Cpk for the outer-diameter and 0.84 Cpk 0.84 for the inner-diameter.

• Proceedings of the Safety Management and Science Conference
• /
• 2006.04a
• /
• pp.133-145
• /
• 2006

EWMA관리도는 SPC 기술 중 가피원인을 탐지하는 기술이 최근품질특성에 가중치가 주어져 미래를 예측하는 능력이 우수하다. EWMA관리도와 EPC의 통합은 연속공정산업에서 성공적으로 사용되고 있다고 널리 인식되어 있다. 그러나, 이산적인 부품 제조공정의 탐지와 연속 생산공정 산업과 그중에서도 제조공정 산업에서의 이들 기법을 적용하기 위해서는 샘플링비율, 고장감지, 실시간 보정과 공정통제에 관한 연구가 필요하다. 본 연구에서는 SPC와 EPC의 차이를 비교분석하고, 제조공정 산업에서 EWMA와 EPC를 성공적으로 통합하여 제품품질특성에 적용하여 변동을 감소시키는 사례연구를 제시하고자 한다.