• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2005년도 추계학술대회 학술발표 논문집 제15권 제2호
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• pp.519-522
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• 2005

This paper presents a self-organizing scheme for multi-agent swarm systems based on coupled nonlinear oscillators (CNOs). In this scheme, unicycle robots self-organize to flock and arrange group formation through attractive and repulsive forces among themselves. It is also shown how localized distributed controls are utilized throughout group behaviors such as formation and migration. In the paper, the proposed formation ensures safe separation and good cohesion performance among the robots. Several examples show that the proposed method for group formation performs the group behaviors such as reference path following, obstacle avoidance and flocking, and the formation characteristics such as flexibility and scalability, effectively.

• 한국환경보건학회지
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• 제20권3호
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• pp.54-60
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• 1994

We established ELISA method which is more rapid and safe than conventional analytical method, and then analyzed concentration of ochratoxin A in the rices by ELISA method. The results were as follows: 1. Since ochratoxin A molecular does not contain the group for coupling reaction, it was first proposed to have the function of an antigen. As a result of conjugation of ochratoxin A-BSA derivatives, one molecular of BSA was conjugated with 13 moleculars of ochratoxin A. 2. On the basis of established ELISA to apply for immuno analytical method of ochratoxin A, the minimal level of detection by ELISA method was at 0.5 ppb. 3. Rices (42) were collected from homes of Kyoungnam districts through November 1992 to December 1992, as a result of analysis, two of these were positive. Rice samples of R-1 and R-9 represented ochratoxin A levels of 6.0 ng/g and 10 ng/g, respectively.

• KSBB Journal
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• 제25권4호
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• pp.319-329
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• 2010

Bifidobacteria comprises up to 25% of the cultivable fecal bacteria in adults and 80% in infants. Many in vivo and clinical research results supporting its efficacy in the prevention and improvement of gastrointestinal health have been accumulated. As a consequence, expert committee WHO/FAO expert committee recommended Bifidobacterium as representative probiotics together with Lactobacillus acidophilus. In this review, research trends in bifidobacteria concerning the classification and identification of the genus Bifidobacterium, modulation of intestinal microflora, improvement of constipation, prevention of diarrhea, alleviation of atopy and allergy, barrier function through antimicrobial activity andimmune enhancement of the host will be introduced. Several gene expression systems based on bifidobacterial plasmids have been developed and successfully used to express several heterologous genes including anticancer proteins in Bifidogacterium. In animal test, bifidobacteria was proven to be a promising candidate for safe gene delivery system which can specifically colonize in the solid tumor.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 춘계학술대회 논문집
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• pp.487-490
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• 2002

AGV is very useful equipment to transfer containers in automated container terminal. AGV must have Obstacle Detection System (ODS) fur port automation. ODS needs the function to classify some specified object from background in acquired data. And it must be able to track classified moving objects. Finally, ODS could determine its next action for safe deriving whether it should do emergency stop or speed down, or it should change its deriving lane. For these functions, ODS can have many different kinds of algorithm. In this paper, we present one of them under developing.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 학술대회 논문집 정보 및 제어부문
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• pp.185-186
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• 2008

In this paper, the problem of stabilization for nonlinear systems with state constraints is addressed. The designed Lyapunov function guarantees that system states remain within constraints for all time and the control law constructed using backstepping renders the origin exponentially stable in the safe region.

• 한국실내디자인학회논문집
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• 제38호
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• pp.209-216
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• 2003

The purpose of this study is to develop furniture design for work space of Office based on the research of furniture design and the survey on the design of the office furniture. The office furniture Is designed in order to use the space flexibly and for the user design in the work space. The furniture type of solo worker on characteristic kinds of works should have a simple shape and it should be safe and easy to move because it has a structural function. The furniture in office should be designed in consideration of moveing line while working. The development of furniture in office which suit human body should be made in consideration of human factors and the study on furniture design in office. As above mentioned, to research and study on the furniture design of working furniture in office which reduces fatigue resulted from labor for office, human factors aspect should be considered, furthermore psychological, mental approach to Ideal solution should be made.

• Steel and Composite Structures
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• 제27권5호
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• pp.613-622
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• 2018

The requirement to safe and economical buildings caused to the exploitation of nonlinear capacity structures and optimization of them. This requirement leads to forming seismic design method based on performance. In this study, concentrically braced frames (CBFs) have been optimized at the immediate occupancy (IO) and collapse prevention (CP) levels. Minimizing structural weight is taken as objective function subjected to performance constraints on inter-story drift ratios at various performance levels. In order to evaluate the seismic capacity of the CBFs, pushover analysis is conducted, and the process of optimization has been done by using Bee Algorithm. Results indicate that performance based design caused to have minimum structural weight and due to increase capacity of CBFs.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2004년도 전력전자학술대회 논문집(1)
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• pp.435-438
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• 2004

Lately, the Intelligent Electronic Device(ED) and the Power System Automation make subjects of discussions and studies. The IED uses microprocessors to practice a lot of functions. In the analog time, an equipment practices only one or two functions. But according to the development of microprocessor and digital technology, it can be implemented by using those kinds of state of the art technology and its function is become more and more powerful. Also, the proliferation of IED makes possible to construct power system automation. An automation of power system make more convenient, safe, and accurate power system. In this paper, a digital protective relay which is a kind of IED and the power automation system are briefly discussed with development and application cases.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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• pp.319-322
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• 2005

This paper describes practical tuning methods and testing of a digital PSS, which uses both frequency and power, with the 220MVA Chungpyung P/P #1 in the KEPCO system to enhance the damping of local modes. In the first step, the objective phase of PSS is computed through a phase leading function to provide compensation between the exciter reference point and the generator air-gap torque before tuning the PSS's time constants. In addition, eigenvalue analysis was used to determine a range of PSS's gain, whichis the more useful for field testing rather than a single gain value. The Real-Time Digital Simulator was used to verify safe operations of the PSS in the presence of disturbances, such as AVR step and three phase fault.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 심포지엄 논문집 정보 및 제어부문
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• pp.185-187
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• 2005

The reactor protection system is the most important function for the safe operation of nuclear powerplants (NPPs) in that such system protects a nuclear reactor tore whose damage can cause an enormous disaster to the nuclear facility and the public. A digital reactor protection system (DRPS) is being developed in KAERI for use in the newly-constructed NPPs and also for replacing the existing analog-type reactor Protection systems. In this paper, an software verification and validation (V&V) activities for DRPS, which are independent of the DRPS development processes, are described according to the software development life cycle. The main activities of DRPS V&V processes are the software planning documentations, the verification of software requirements specification (SRS) and software design specification (SDS), the verification of codes, the tests of the integrated software and system. Moreover, the software safety analysis and the software configuration management are involved in the DRPS V&V processes. All of the V&V activities are described, in detail, in this paper.