• 제목/요약/키워드: Design of a Block

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분리 최적화 기법을 이용한 구조적 불확실계의 강인 제어기 설계 (Designing observer-based robust compensators for parametric uncertain systems by block-diagonal approach)

  • 김경수;박영진
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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    • pp.109-112
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    • 1997
  • In this note, we investigate a noniterative design method of an observer-based robust H$\_$2/ controller in the presence of structured real parameter uncertainty by applying Riccati approach based on the guaranteed cost function. Motivated by the numerical difficulty of the problem, we try to develop a simple design method named as block-diagonal approach, which can be solved by the LMIs method. By assuming the block-diagonal structure of Riccati solution, the original problem can be derived into two sequentially decoupled optimization problems as LQG control problem. The proposed method seems to be numerically efficient in obtaining a feasible compensator.

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Smart Building Block Toys using Internet of Things Technology

  • Jang, Sung Hee;Nam, Ki Won;Jung, Yong Gyu
    • International Journal of Advanced Culture Technology
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    • 제4권2호
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    • pp.34-37
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    • 2016
  • Internet was once used to link ideas, then people and now it is starting to connect all things. IoT constitutes a good paradigm to enable people to design and modify things, and then share their designs and modifications. Through the internet, things nowadays are able to exchange raw data and information, thus enabling the development of a new class of interconnected smart objects. Smart building block toy systema are a newly proposed concept that combines internet technology into educational blocks. It is composed of the IoT environment that has attracted attention recently. In this paper, we design a system using starUML, one of the program development tools in the system design process. Educational content can be shared to learners via the proposed service of the IoT, while also being interesting for young child learners.

랜덤화 블록 계획법에서 위치를 이용한 비모수 검정법 (Nonparametric method using placement in a randomized complete block design)

  • 심수진;김동재
    • Journal of the Korean Data and Information Science Society
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    • 제24권6호
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    • pp.1401-1408
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    • 2013
  • 반복이 있는 랜덤화 블록 계획법에서 우산형 대립가설을 검정하기 위한 비모수 방법에는 Kim과 Kim (1992)이 제안한 방법이 있다. 본 논문에서는 Orban과 Wolfe (1982)가 제안한 위치와 Kim (1999)이 제안한 대조군과 처리군의 방법을 확장하여 랜덤화 블록 계획법에서 우산형 대립가설에서의 검정법을 제안하였다. 또한 여러 분포에 대한 모의실험 통하여 기존의 방법과의 검정력을 비교하였다.

기능분석을 이용한 항공기 설계요구의 할당 및 추적에 관한 연구 (A Study on the Requirements Allocation and Tracking by Implementing Functional Analysis)

  • 이재우
    • 한국군사과학기술학회지
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    • 제2권2호
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    • pp.52-60
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    • 1999
  • By implementing the Systems Engineering process for the aircraft preliminary design, functional analysis study is performed, hence Functional Interface Data Flow(FIDF) and Functional Flow Block Diagram(FFBD) are generated. Based on FIDF and FFBD, allocable and non-allocable design/performance/RM&S requirements are allocated to the appropriate levels. Weight and cost tracking and design margin management methodologies are studied and implemented for the balanced aircraft design.

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도시형 자기부상열차를 위한 새로운 레일지지부의 설계 (Design of New Rail Support Block for Urban Maglev)

  • 장승엽;최일윤;여인호
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2007년도 추계학술대회 논문집
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    • pp.1318-1323
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    • 2007
  • Proposed herein is a shape design of a different rail support block with existing ones for the commercialization of the urban maglev. The rail support for existing test lines adopts monoblock steel sleeper, whereas an individual support system has been proposed to achieve an additional cost savings and to provide an emergency exit. Also, to enhance the easiness of installation and the repairability, alignment adjusting methods suitable for the new design have been devised.

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대학과 지역사회의 연계성 강화를 위한 보행전용가로 조성방안 연구 -서울산업대학교앞 철도폐선부지를 중심으로- (A Study on the Pedestrian Mall Planning and its Design in Campus Surroundings -in the Case of the Regenerated Block of Kyungchun-railroad Track-)

  • 윤용기
    • 교육시설
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    • 제14권4호
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    • pp.75-85
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    • 2007
  • The purpose of this study is to find out the characteristics of physical planning elements in the pedestrian malls when cultural events for young ages proved; the planning strategies for the regeneration of the block of Kyungchun-railroad track, which is removing planned in campus surroundings. Local Government' initiation makes possible to make improvement and give administrative and financial support which is sensitive to the existing conditions of railroad for the better living environment. Thus, this research suggests how the block of Kyungchun-railroad track, which is removing planned, as a newly organized pedestrian mall design system can cope with collaborating a board and community, which has in campus surroundings related. This study consists of following four parts; 1. six-case pedestrian mall in campus surroundings in Seoul were analyzed in terms of physical and cultural factors for young ages between university and community. 2. we focused on the analysis of correlation between the physical planning factors and the spatial requirements for cultural event when the pedestrian mall in campus surroundings is designed. The paper's significance lies in that it shows a new direction in urban renewal planning and design which has been made into a pedestrian mall plan through in support of the application to the pilot project compared with previous physical environment.

자동차 트림다이 자동설계 시스템 개발에 관한 연구 (A Study on the Development of Autometic Design System for TRIM DIE)

  • 김태수;이상준;김상권
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 1998년도 제2회 박판성형심포지엄 논문집 박판성형기술의 현재와 미래
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    • pp.47-56
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    • 1998
  • Designing Trim die block is a complicated and time-consuming process heavily resting on the experience of the designer. To reduce design time and human errors, a knowledge base is used to automated the design process. In this paper, a framework of the Rule-based CAD System is presented for trim die block design consisting of a rule-base, design process control module and geometric modeler (CATIA). The rule-base includes design rules and know-how of design specialist. CATIA is used as the overall CAD environment and rule-base and design control modules are developed by C++ language with an interface to CATIA. Using the rule-base, the designer can explore alternating designs fast by changing design parameters and the part-list is automatically created which avoids miscommunication.

Application of welding simulation to block joints in shipbuilding and assessment of welding-induced residual stresses and distortions

  • Fricke, Wolfgang;Zacke, Sonja
    • International Journal of Naval Architecture and Ocean Engineering
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    • 제6권2호
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    • pp.459-470
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    • 2014
  • During ship design, welding-induced distortions are roughly estimated as a function of the size of the component as well as the welding process and residual stresses are assumed to be locally in the range of the yield stress. Existing welding simulation methods are very complex and time-consuming and therefore not applicable to large structures like ships. Simplified methods for the estimation of welding effects were and still are subject of several research projects, but mostly concerning smaller structures. The main goal of this paper is the application of a multi-layer welding simulation to the block joint of a ship structure. When welding block joints, high constraints occur due to the ship structure which are assumed to result in accordingly high residual stresses. Constraints measured during construction were realized in a test plant for small-scale welding specimens in order to investigate their and other effects on the residual stresses. Associated welding simulations were successfully performed with fine-mesh finite element models. Further analyses showed that a courser mesh was also able to reproduce the welding-induced reaction forces and hence the residual stresses after some calibration. Based on the coarse modeling it was possible to perform the welding simulation at a block joint in order to investigate the influence of the resulting residual stresses on the behavior of the real structure, showing quite interesting stress distributions. Finally it is discussed whether smaller and idealized models of definite areas of the block joint can be used to achieve the same results offering possibilities to consider residual stresses in the design process.

IIoTBC: A Lightweight Block Cipher for Industrial IoT Security

  • Juanli, Kuang;Ying, Guo;Lang, Li
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제17권1호
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    • pp.97-119
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    • 2023
  • The number of industrial Internet of Things (IoT) users is increasing rapidly. Lightweight block ciphers have started to be used to protect the privacy of users. Hardware-oriented security design should fully consider the use of fewer hardware devices when the function is fully realized. Thus, this paper designs a lightweight block cipher IIoTBC for industrial IoT security. IIoTBC system structure is variable and flexibly adapts to nodes with different security requirements. This paper proposes a 4×4 S-box that achieves a good balance between area overhead and cryptographic properties. In addition, this paper proposes a preprocessing method for 4×4 S-box logic gate expressions, which makes it easier to obtain better area, running time, and power data in ASIC implementation. Applying it to 14 classic lightweight block cipher S-boxes, the results show that is feasible. A series of performance tests and security evaluations were performed on the IIoTBC. As shown by experiments and data comparisons, IIoTBC is compact and secure in industrial IoT sensor nodes. Finally, IIoTBC has been implemented on a temperature state acquisition platform to simulate encrypted transmission of temperature in an industrial environment.

IP Design of Corrected Block TEA Cipher with Variable-Length Message for Smart IoT

  • Yeo, Hyeopgoo;Sonh, Seungil;Kang, Mingoo
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제14권2호
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    • pp.724-737
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    • 2020
  • Corrected Block TEA(or XXTEA) is a block cipher designed to correct security weakness in the original block TEA in 1998. In this paper, XXTEA cipher hardware which can encrypt or decrypt between 64-bit and 256-bit messages using 128-bit master key is implemented. Minimum message block size is 64-bit wide and maximal message block size is 256-bit wide. The designed XXTEA can encrypt and decrypt variable-length message blocks which are some arbitrary multiple of 32 bits in message block sizes. XXTEA core of this paper is described using Verilog-HDL and downloaded on Vertex4. The operation frequency is 177MHz. The maximum throughput for 64-bit message blocks is 174Mbps and that of 256-bit message blocks is 467Mbps. The cryptographic IP of this paper is applicable as security module of the mobile areas such as smart card, internet banking, e-commerce and IoT.