마블세면대 제품개발 및 시장성장에 관한 사례 연구

황규일,이재하 남서울대학교 경영연구센타 2000 경영연구 Vol.2 No.-

Given the rapid growth of home-building industry, the market of cultured marble wash-basin has been developed over the past two decades. Since the late 70's, the construction of large-scale apartment complex has resulted in significant growth in wash-basin market. The early market of wash-basin was largely dominated by earthenware. However, the needs for trash-basket, changes in design and colour, and high-quality were substituted marble wash-basin for earthenware. That is the material advantages of which marble have design change easily, smart finishing touches, size stability, etc. Especially, marble has the material property of making product not restricted by size. And the case of product development of marble wash-basin of Dong-Bang corporation was introduced. Base on this study, the market of cultured marble wash-basin will be more grow and all new items will be of the highest quality toward functional product.

硬化條件 變更을 통한 浴槽 및 洗面器 生産性向上 事例硏究

황규일,이재하 남서울대학교 경영연구센터 2001 경영연구 Vol.3 No.-

In the hardening process of cultured marble bath-tub and wash-basin, it is important to maintain an average temperature condition. That is why that quality of cultured marble product is settled by the accurate temperature condition. This paper focus on hardening way to improve productivity of cultured marble products. And new hardening way which is used infrared rays is introduced. New way apply tube-heater in hardening the marble products. According to the example of 'D' company, excellency of this way is established.

적응 루프법을 이용한 진화적 구조 위상 최적설계

황승민,박재용,임민규,오영규,한석영 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

This paper presents a reliability-based topology optimization (RBTO) using bi-directional evolutionary structural optimization (BESO). Topology optimization is formulated as volume minimization problem with probabilistic displacement constraint. Young's modulus, external load and thickness are considered as uncertain variables. In order to compute reliability index, four methods, i.e., RIA, PMA, SLSV and ADL(adaptive-loop), are used. Reliability-based topology optimization design process is conducted to obtain optimal topology satisfying displacement and reliability index constraints with the above four methods, and then each result is compared with respect to numerical stability and computing time.

鍍金工程의 操業標準에 관한 硏究

황규완,안재영 慶南專門大學 1997 論文集 Vol.25 No.1

토글-회전관성댐퍼를 이용한 구조물의 성능개선

황재승,이상현,송진규,홍성목 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

This paper presents a new vibration control device by which the mass and damping of a structure is increased equivalently. The vibration control system, named toggle-rotational inertia-viscous damper, can be utilized effectively in applications of small structural drift. Numerical analysis shows that because the relative drift of a structure can be effectively amplified by the toggle system, the device has a great performance in the vibration control without the increase of the damper capacity and size. It is also observed that vibration control effects is caused by the increase of equivalent mass and damping due to the rotational inertia and damping of the device.

人造大理石(Marble) 浴槽의 製品開發에 관한 事例 硏究

황규일,이재하 남서울대학교 경영연구센타 2000 경영연구 Vol.2 No.-

This case study illustrates a number of key issues involved in the product development of cultured marble bath-tub. Many various products of cultured marble bath-tub were introduced to meet the needs of consumers according to the growth of the home-building industry. The success of marble products is based partly on creating and producing high quality, beauty, and colour and on advanced technologies of automation and mass production. In recent years items have ranged from Curio, β-curio to Flora, Onyx in line with a price level. For example, the case of product development of β-curio and Flora of 'Dong-Bang' Corporation was introduced. The product life cycle of the cultured marble bath-tub will be continue long because of having the naturally material advantages of which marble have design change easily, finishing touches, and size stability and the trend of the product development of cultured marble bath-tub is to the elegant and high-quality.

율-왜곡 이론에 의한 H.263부호기의 성능 분석

황재정,황치규,박종필 群山大學校 情報通信技術硏究所 1998 情報通信技術硏究論文集 Vol.2 No.-

Rate-distortion theory means that the lower limit of transmission rate is determind according to the distortion quantity. This theory is fundamentally important factor in the visual system without visually sensitive distortion. Rate-distortion theory originating in the notion of information quantity is derived using probability distribution of orignal signal and measurement of distortion. In this paper, we develop the R(D) function with the distribution function of Gaussian and Laplacian, using the absolute error criteria and the square error criteria. Then we applied these functions to H.263 video coder at very low-bitrate. Though the Laplacian and Gaussian distribution can be applied, we show that the lowest point on which the rate becomes zero is lower in the case of Laplacian than in the case of Gaussian.

순차적 크리깅기법을 이용한 미소혼합기의 최적화

박재용,유진식,황승민,임민규,오영규,김용대,한석영,맹주성 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-

An active micro-mixer, which is composed of an oscillating micro-stirrer in the micro-channel to provide effective mixing was optimized. The effects of molecular diffusion and disturbance by the stirrer were considered with regard to two types of mixer models: the simple straight micro-channel and micro-channel with an oscillating stirrer. Two types of mixer models were studied by analyzing mixing behaviors such as their interaction after the stirrer. The mixing was calculated by Lattice Boltzmann methods using the D2Q9 model. In this study, the time-averaged mixing index formula was used to estimate the mixing performance of time-dependent flow. The mixing indices of the two models were compared. From the results, it was found that the mixer with an oscillating stirrer was much more enhanced' and stabilized. Therefore, an approximate optimization of an active micro-mixer with an oscillating stirrer was performed using Kriging method with OLHD (Optimal Latin Hypercube Design) in order to determine the optimal design variables. The design parameters were established as the frequency, the length and the angle of the stirrer. The optimal values were obtained as 1.5754, 0.803D and ±45°, respectively. It was found that the mixing index of the optimal design increased by 83.36% compared with that of the original design.

신뢰성 지수에 의한 위상최적화

임민규,박재용,황승민,오영규,박재용,한석영 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

The objective of this work is to integrate reliability analysis into topology optimization problems. The reliability index determines design domain and uncertainty value. The elemental sensitivity numbers are calculated from finite element analysis and then converted to the nodal sensitivity numbers in the design domain. A mesh-independency filter using nodal variables is introduced to determine the addition of elements and eliminate unnecessary structural details below a certain length scale in the design. To further enhance the convergence of the optimization process, the accuracy of elemental sensitivity numbers is improved by its historical information. Application of the RBTO model gives a different topology relative to DTO. It is found that the RBTO model yields more reliable optimal topologies than those produced by DTO.

ESO기법을 이용한 신뢰성 기반 형상 최적설계

오영규,박재용,황승민,임민규,박재용,한석영 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

This paper presents a reliability-based shape optimization (RBSO) using the evolutionary structural optimization (ESO). An actual design involves uncertain conditions such as material property, operational load and dimensional variation. The deterministic optimization (DO) is obtained without considering uncertainties related to uncertainty parameters. However, the RBSO can consider the uncertainty variables because it has the probabilistic constraints. In order to determine whether the probabilistic constraint is satisfied or not, simulation techniques and approximation methods are developed. In this paper, the reliability-based shape design optimization method is proposed by utilizing the reliability index approach (RIA), performance measure approach (PMA), single-loop single-vector (SLSV), adaptive-loop (AOL) are adopted to evaluate the probabilistic constraint. In order to apply the ESO method to the RBSO, a sensitivity number is defined as the change in the displacement. Numerical examples are presented to compare the DO with the RBSO. The results of design example show that the RBSO model more reliable than deterministic shape optimization.