• 한국품질경영학회:학술대회논문집
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• 한국품질경영학회 2004년도 품질경영모델을 통한 가치 창출
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• pp.160-165
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• 2004

최근 각 기업에는 6시그마, PI등 여러 가지 혁신 활동이 차별화 되지 않고 도입되는 경향이 있으며, 기업 내부에서도 바람직한 혁신활동 연계방안에 대해서 많은 고민을 하고 있는 실 정 임. 따라서 이러한 혁신활동을 잘 이해하고 통합할 수 있는 방안이 필요 할 것이며, 여기에서는 이것들을 연계한 경영 전략을 제시하고자 한다. 6시그마와 PI의 특징을 살펴보면, 비즈니스 리엔지니어링은 급격하게 변화하는 프로세스의 구성을 의미하는 것으로 볼 수 있으나 PI는 보다 포괄적인 개념이다. 즉, 새로운 작업전략(Work Strategy)의 비전설정과 실질적인 프로세스 디자인 활동을 포함한다. 또한 기술적 차원, 인간적 차원, 조직적 차원등 다차원적 변화의 추진과 실행을 의미한다. 반면에 6시그마는 고객의 요구(Customer Requirement)를 명확히 이해하고 이에 대응하는 기업의 모든 활동을 Top Down시각에서 합리적인 전사 표준을 통해 측정, 평가 후 도출되는 문제점 및 개선 사항에 대해 개선 프로세스에 따라 TFT(Task Force Team) 활동을 지속적으로 전개함으로써 총체적 고객만족을 구현하는데 궁극적인 목적을 둔다. 이러한 경영혁신 활동은 구성원의 참여를 기반으로 하며, 이에 대한 권한 위임과 더불어 지속적인 지원을 바탕으로 제품 및 서비스에 영향을 미치는 모든 부문에 걸쳐 영역 제한 없이 실시하는 것을 의미한다. 따라서 6시그마는 결코 PI를 대체할 수 없으며 상호 보완적 관계로 연계시켜 추진하는 것이 바람직하다.

• Journal of Welding and Joining
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• 제28권1호
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• pp.72-76
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• 2010

Irregular fluctuation of penetration depth in CW single mode fiber laser welding is analyzed statistically and chaotically. Among various chaos theories, one of the basic concept referred as Lyapunov exponent is applied to the analysis to quantify the irregularity of penetration. Especially, maximal Lyapunov exponent (MLE) is known as the representative value indicating chaotic degree of the system dynamics. MLE calculation method of experimental data is applied to longitudinal spiking defect in fiber laser weld. Laser power modulation is suggested as a remedy then the computed MLE value is compared to CW case. It is shown that the adoption of chaos theory, MLE computation, can be used as a measurement standard to prove the validity of the solutions to prevent the unexpected chaotic behavior of weld through this work.

• 로봇학회논문지
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• 제3권2호
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• pp.117-122
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• 2008

This paper presents a multi-robot localization based on multidimensional scaling (MDS) in spite of the existence of incomplete and noisy data. While the traditional algorithms for MDS work on the full-rank distance matrix, there might be many missing data in the real world due to occlusions. Moreover, it has no considerations to dealing with the uncertainty due to noisy observations. We propose a robust MDS to handle both the incomplete and noisy data, which is applied to solve the multi-robot localization problem. To deal with the incomplete data, we use the Nystr$\ddot{o}$m approximation which approximates the full distance matrix. To deal with the uncertainty, we formulate a Bayesian framework for MDS which finds the posterior of coordinates of objects by means of statistical inference. We not only verify the performance of MDS-based multi-robot localization by computer simulations, but also implement a real world localization of multi-robot team. Using extensive empirical results, we show that the accuracy of the proposed method is almost similar to that of Monte Carlo Localization(MCL).

• 한국항공운항학회지
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• 제8권1호
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• pp.95-109
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• 2000

The analyses of the aircraft accidents across all of the world, including Korea, reported that 70 % of the accidents could be attributed to the faults of pilots' human factors. It implied that the aircraft accidents could be cut down remarkably if the pilots' faults were reduced. In this context, the purpose of the study were to explore and reduce the problems of authoritarian job performance in the cockpit operation of which mainly depended on the captain, though it was supposed that two or more pilots work together as a team. In relation to this, the current worldwide trend of pilot education had tended to emphasize education on the human factors of pilots since the strong recommendation of the International Civil Aviation Organization in the 1980's. From the educational dimension of the pilots, it was attempted to explore a new educational perspective which would enhance the flight crew's performance of the cockpit through improving the courses of the pilot education curriculum and the teaching-learning methods.

• International Journal of Automotive Technology
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• 제7권2호
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• pp.139-143
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• 2006

As an automobile tends to be high grade, the needs for more luxurious interior and comfortable HVAC system are emerged. The defrosting ability is another major factor of the performances of HVAC system. The present work is to simulate the flow and the temperature field of cabin interior during the defrost mode. The three-dimensional incompressible Navier-Stokes equations and energy equation were solved on the multi blocked grid system by the iterative time marching method and AF scheme, respectively. The present computations were validated by the comparison of the temperature field of a driven cavity and velocity field of 1/5 model scale of an automobile. Generally good agreements were obtained. By the present computation, the complicated features of flow and temperature within the automotive cabin interior could be well understood.

• 대한조선학회 특별논문집
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• 대한조선학회 2005년도 특별논문집
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• pp.165-170
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• 2005

The weight of a ship depends on the size of the ship. Normal lightweight of a ship is over 10,000 tons. So it is inevitable to divide a ship into about more than hundreds of lumps. Each of lumps is called as a block in shipbuilding. The sizes of blocks are decided by a yard's facilities. Among them lifting cranes are most decisive facilities. By block's size the productivity of a yard is decided very much. So it is very important to have a proper block division during shipbuilding. This paper refers to the recent trend of block division among yards. This paper would give an idea how to decide boundaries of blocks. Block division also decides both quality of a ship and work volume of it. These days the block erection method is changed dramatically due to use sea barge mounted crane for erection of a grand ring block. This paper explains the new trend of block division in shipbuilding.

• 한국해양공학회지
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• 제17권3호
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• pp.27-32
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• 2003

The welding distortion of a hull structure in the shipbuilding industry is inevitable at each assembly stage. The geometric inaccuracy caused by the distortion tends to preclude the introduction of automation and mechanization. Thus, additional man-hours are needed for the adjusting work in the assembly stage. To overcome this problem, a distortion control method should be applied. For this purpose, it is necessary to develop an accurate prediction method that can explicitly account for the influence of various factors on the welding distortion. In order to minimize the weld-induced residual deformation, this paper proposes the optimum welding sequence as a method for distortion control. The validity of this method has been substantiated by a number of numerical simulations and experiments.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제13권4호
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• pp.277-283
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• 2013

In this study, we propose a novel method for modeling dynamic hysteresis. Hysteresis is a widespread phenomenon that is observed in many physical systems. Many different models have been developed for representing a hysteretic system. Among them, the Duhem model is a classical nonlinear dynamic hysteresis model satisfying the properties of hysteresis. The purpose of this work is to develop a novel method that expresses the local dynamics of the Duhem model by a linear system model. Our approach utilizes a certain type of fuzzy system that is based on Takagi-Sugeno (T-S) fuzzy models. The proposed T-S fuzzy Duhem model is achieved by fuzzy blending of the linear system model. A simulated example applied to shape memory alloy actuators, which have typical hysteretic properties, illustrates the applicability of our proposed scheme.

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2004년도 추계학술대회
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• pp.361-368
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• 2004

The purpose of the study was to explore the potential of the Social Network Analysis as an analytical tool for scientific investigation of learner-learner, or learner-tutor interaction within an Computer Supported Corporative Learning (CSCL) environment. Theoretical and methodological implication of the Social Network Analysis had been discussed. Following theoretical analysis, an exploratory empirical study was conducted to test statistical correlation between traditional performance measures such as achievement and team contribution index, and the centrality measure, one of the many quantitative measures the Social Network Analysis provides. Results indicate the centrality measure was correlated with the higher order learning performance and the peer-evaluated contribution indices. An interpretation of the results and their implication to instructional design theory and practices were provided along with some suggestions for future research.

• 한국실내디자인학회논문집
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• 제30호
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• pp.42-50
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• 2002

This research deals with a new concept regarding creative enlargement in order for useful space composition. Architecture, through interior design case analysis has given birth to a new concept and inspiration altering interior designer's perspectives on the future environment. Focusing exclusively on those offices that express in design terms a commitment to such concepts as team-Working, just-in-time Working, virtual and mobile working and those using the newest technological tools and the latest space-planning concepts available. Emphasis is placed on how an office environment can be designed to encourage group working, the sharing of knowledge, a spirit of community within larger organizations, and non-territorial working-employees that work where and how they want supported by cordless technologies.