생산셀 설계와 셀 배치계획을 위한 계층적 접근

김장형,문치웅 濟州大學校工科大學産業技術硏究所 1995 尖端技術硏究所論文集 Vol.6 No.-

This paper is a hierarchical approach for manufacturing cell design and cell layout planning in flexible manufacturing environments. To solve this problem, the proposed model incorporates relevant manufacturing factors such as workload and cell size. Based on those information, to form the manufacturing cell, correlation similarity coefficient(CSC) between machines are calculated and a pair of machines that has the highest value of CSC is assigned to a machine cell. Repeat the above steps until the adequate manufacturing cells are obtained. Because the obtained cellular structure for the manufacturing system design in the previous stage does not give the layout of the cells on the site directly, it is important to determine the adequate cell layout. For the cell layout planning, the adjacent relationship among cells are determined on the basis of the degree of interference among cells which is evaluated by the volume of the intercellular movements among cells. The relationship obtained by this procedure determines the configuration of the cell layout. Finally, a system is developed to increase the efficiency of a proposed model. The proposed model and system are illustrated by a numerical example.

생산셀 설계와 셀 배치계획을 위한 계층적 접근

김장형,문치웅 濟州大學校 産業技術硏究所 1995 산업기술연구소논문집 Vol.6 No.-

This paper is a hierarchical approach for manufacturing cell design and cell layout planning in flexible manufacturing environments. To solve this problem, the proposed model incorporates relevant anufacturing factors such as workload and cell size. Based on those information, to form the manufacturing cell, correlation similarity coefficient(CSC) between machines are calculated and a pair of machines that has the highest value of CSC is assigned to a machine cell. Repeat the above steps until the adequate manufacturing cells are obtained. Because the obtained cellular structure for the manufacturing system design in the previous stage does not give the layout of the cells on the site directly, it is important to determine the adequate cell layout. For the cell layout planning, the adjacent relationship among cells are determined on the basis of the degree of interference among cells which is evaluated by the volume of the intercellular movements among cells. The relationship obtained by this procedure determines the configuration of the cell layout. Finally, a system is developed to increase the efficiency of a proposed model. The proposed model and system are illustrated by a numerical example.

자기조직화 신경망을 이용한 셀 형성 문제의 기계 배치순서 결정 알고리듬

전용덕(Yong-Deok Jeon) 한국산업경영시스템학회 2019 한국산업경영시스템학회지 Vol.42 No.2

Self Organizing Map (SOM) is a neural network that is effective in classifying patterns that form the feature map by extracting characteristics of the input data. In this study, we propose an algorithm to determine the cell formation and the machine layout within the cell for the cell formation problem with operation sequence using the SOM. In the proposed algorithm, the output layer of the SOM is a one-dimensional structure, and the SOM is applied to the parts and the machine in two steps. The initial cell is formed when the formed clusters is grouped largely by the utilization of the machine within the cell. At this stage, machine cell are formed. The next step is to create a flow matrix of the all machine that calculates the frequency of consecutive forward movement for the machine. The machine layout order in each machine cell is determined based on this flow matrix so that the machine operation sequence is most reflected. The final step is to optimize the overall machine and parts to increase machine layout efficiency. As a result, the final cell is formed and the machine layout within the cell is determined. The proposed algorithm was tested on well-known cell formation problems with operation sequence shown in previous papers. The proposed algorithm has better performance than the other algorithms.

gm-cell 배치에 따른 저전력 DCO의 성능 변화 분석과 최적화 설계 제안

유상선 한국정보통신학회 2023 한국정보통신학회논문지 Vol.27 No.6

This paper verifies how the performance of the LC oscillator varies depending on the location of the negative gm-cell and proposes an optimal location of gm-cell in layout. Two LC-oscillators with the same core and inductor were designed, and only the location of the gm-cell was designed differently, and the performance of the two structures was compared. When the gm-cell is placed close to the main inductor, the phase noise is 2 dB better than when the gm-cell is placed far away from the inductor, and the power consumption is 15% less. Using the proposed design optimization process, the phase noise of -116.2 dBc/Hz @ 1 MHz in the 4.8 GHz is obtained. Then, the current consumption was 0.66-mA with 0.8-V supplay voltage. This performance is better than others works and this performance can support the BLE standard even if PVT changes. 본 논문은 gm-cell 위치에 따라 LC 오실레이터의 성능이 어떻게 달라지는지 검증하고 최적의 위상잡음 성능을 위한 gm-cell의 layout 위치에 관하여 제안한다. 동일한 코어와 인덕터를 갖는 LC 오실레이터 2개를 설계하여 gm-cell의 위치만 다르게 설계하여 두 구조의 성능을 비교하였다. 메인 인덕터에 gm-cell을 가까이 배치할 때의 성능이 gm-cell을 인덕터에서 멀리 배치할 때보다 위상 잡음이 2 dB 좋은 결과를 얻었으며 전력 소모도 15%적은 것을 실험을 통하여 확인 하였다. 메인 인덕터에 gm-cell을 가까이 배치하는 설계 기법을 이용하여 4.8GHz 대역에서 -116.2 dBc/Hz @ 1 MHz의 위상 잡음을 얻었다. 이때 전류 소모는 0.66-mA 였고 0.8V의 공급전원을 사용하였다. 이 성능은 기존에 연구 발표된 DCO 보다 좋은 성능을 얻었으며 이 성능은 PVT변화가 생기더라도 BLE 표준을 만족시킬 수 있다.

상세배치를 위한 확장된 인터리빙 기법

오은경(Eun Kyung Oh),허성우(Sung Woo Hur) 한국정보과학회 2006 정보과학회논문지 : 시스템 및 이론 Vol.33 No.8

본 논문에서는 상세배치를 개선할 수 있는 확장된 인터리빙 기법을 제안한다. 기존의 행-기반 인터리빙 기법은 한 행 내에서만 셀의 위치를 이동할 수 있는 제약이 있으며, 모든 셀이 여백 없이 인접해 있다는 가정 하에 적용 가능하였다. 본 논문에서 제안한 확장된 인터리빙 기법은 그런 제약을 극복하여 셀이 다른 행간에도 이동할 수 있도록 하였고, 또한 셀들 사이에 여백이 있는 경우에도 인터리빙 기법을 적용할 수 있도록 하였다. 반도체 설계 회사에서 사용 중인 CAD 툴에 의해 수렴된 상세배치를 제안된 인터리빙 기법을 이용하여 추가로 개선시킨 결과 HP(half perimeter)가 평균 9.5%가 개선되었다. In this paper we propose an extended interleaving technique to improve a detailed placement. The existing row-based interleaving technique allows cells to move only within a row and it can be applied when there is no space between cells. The proposed extended-interleaving technique releases such constraints so that cells can move along with a vertical line parallel to a y-axis and space between cells is properly handled. Converged detailed-placements by a mature CAD tool have been improved by the proposed interleaving technique by 9.5% on average in half-perimeter wire length.

표준 셀 레이아웃 형태에서 기능 모듈 자동 생성

최연경 경민대학 산학기술연구소 2001 경민대학연구논총 Vol.2 No.1

This paper proposes a new functional module generator in the standard cell layout style. Traditional researches about cell generation try to minimize the width of the generated modules while considering the height manually. Nowadays cell height becomes an important factor because of arbitrary cell structure that comes from variable transistor sizes. We develope an automatic module cell generator which minimizes the area of the modules by considering both the cell height and the cell width. The developed generator efficiently generate functional module automatically and show improvement in the cell area compared to the previous results we've tested.

Implementation of Novel GDI D-Flip-Flop for RTL Design

Seungmin Jung 한국정보과학회 2023 Journal of Computing Science and Engineering Vol.17 No.4

In this paper, we proposed a small area hybrid D-flip-flop (DFF) circuit based on the gate diffusion input (GDI) technique. The proposed circuit consisted of only 12 MOS transistors compared to CMOS. This circuit was designed to be applied to a standard cell library used for register transfer level (RTL) flow. To compare with CMOS, circuit characteristics were verified through simulation and layout using 1.8 V 180n standard CMOS process parameters. The proposed GDI DFF cell reduced the layout area by less than half while maintaining delay and power compared to CMOS. Characteristics of the implemented circuit are discussed, and simulation results are reported.

회로 면적 최소화를 위한 렉틸리니어 셀 재설계와 셀 재배치 알고리즘

김경창(Kyungchang Kim),정민지(Minji Jeong),김학윤(Hackyoon Kim),현대준(Daijoon Hyun) 한국정보기술학회 2023 Proceedings of KIIT Conference Vol.2023 No.6

Laws & Regulations concerning Base-Stations for Next-generation Mobile Communication Networks

Noh, Sun-Kuk The Korea Institute of Information and Commucation 2004 Journal of information and communication convergen Vol.2 No.4

With the commercialization of CDMA 2000-1x late in 2000, a high-speed wireless Internet, based on a mobile communication networks, appeared in Korea. This will develop into the next-generation of mobile communications(4G) in the future and the new cell layout will be required the cellular configuration of 4G. We would need the legislation with respect to base-stations and to building the mobile communication networks, as well as the optimization of mobile communication systems. In this study, in order to provide 4G, I examined and analyzed that the current laws & regulations related to licensing and operating a mobile communication base-stations in KOREA.

셀룰러제조시스템의 셀 형성을 위한 그룹테크 놀러지에 관한 연구

이용균(Yong-Kyun Lee) 한국경영사학회 2017 經營史學 Vol.83 No.-

본 연구는 소비자들의 다양한 욕구를 충족시키는 동시에 생산성을 높이기 위해 개발된 설비배치방법인 셀룰러배치를 위해 가장 대표적으로 사용되는 기법인 그룹테크놀러 지에 대한 지난 삼십여년간의 연구동향을 살펴본 연구이다. 본 논문의 연구대상은 셀룰러제조시스템에서의 셀 형성기법과 그룹테크놀러지에 관하여 발표된 연구들이다. 국내의 학술지에서는 이들에 대한 연구들을 거의 찾아볼 수 없어 외국 학술지를 중심으로 셀 형성기법의 유형별로 분류하여 살펴보았고, 이들 셀 형 성기법들이 가지고 있는 한계점들을 고찰하였다. This study brings the attention towards the need for designing the cellular manufacturing system(CMS) for optimal result as most of the past research work has been focused to the clustering of machines and parts into cells and part families. CMS is an important application of group technology(GT), a manufacturing philosophy in which parts are formed into part families based similar processing requirements rather than similar functional aspects and machines are allocated into machine cells to take advantage of the similarities among parts in manufacturing. In this study various techniques and methodology about GT have been briefly reviewed with their salient features. Most of the published works on GT pay very little attention towards production planning and control activities of CMS.