• 제어로봇시스템학회:학술대회논문집
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• 2005.06a
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• pp.2350-2355
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• 2005

In this paper, we introduce biped walking robot which can static walking with 22 degree-of-freedoms. The developed biped walking robot is 480mm tall and 2500g, and 22 RC servo motors are used to actuate. Before made an active algorithm, we generated the motions of robot with the motion simulator which developed using by C language. The two dimension simulator is Based on the inverse kinematics and D-H transform. The simulator implements various motions as inputted the ankle's trajectory. Also we developed a simulator which is applied the principle of inverted pendulum to acquires the center of gravity. As we use this simulator, we can get the best appropriate angle of ankle and pelvis when the robot lifts up its one side leg during the working. We implement the walking motions which is based on the data(angle) getting from both of simulators. The robot can be controlled by text shaped command through RF signal of wireless modem which connected with laptop computer by serial cable.

• Structural Engineering and Mechanics
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• v.8 no.5
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• pp.453-464
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• 1999

Safety monitoring systems of structures generally resort to detecting possible changes of dynamic system parameters. Sensitivity analysis of these dynamic system parameters may implement these techniques. Conventional structural eigenvalue problems are discussed in the scope of those systems with deterministic parameters. Large and flexible structures, such as suspension bridges, actually possess stochastic material properties and these random properties unavoidably affect the dynamic system parameters. The sensitivity matrix of structural modal parameters to basic design variables has been established in this paper. Moreover, second order statistics of natural frequencies due to the randomness of material properties have been discussed. It is concluded from numerical analysis of a modem suspension bridge that although the second order statistics of frequencies are small relatively to the change of basic design variables, such as density of mass and modulus of elasticity, the sensitivities of modal parameters to these variables at different locations change in magnitude.

• IEIE Transactions on Smart Processing and Computing
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• v.5 no.6
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• pp.375-382
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• 2016

This paper realizes control of the motion of a swimming robot fish in order to implement an underwater robot fish aquarium. And it implements positional control of a two-axis trajectory path of the robot fish in the aquarium. The performance of the robot was verified though certified field tests. It provided excellent performance in driving force, durability, and water resistance in experimental results. It can control robot motion, that is, it recognizes an object by using an optical flow object-detecting algorithm, which uses a video camera rather than image-detecting sensors inside the robot fish. It is possible to find the robot's position and control the motion of the robot fish using a radio frequency (RF) modem controlled via personal computer. This paper proposes realization of robot fish motion-tracking control using the optical flow object-detecting algorithm. It was verified via performance tests of lead-lag action control of robot fish in the aquarium.

• Journal of the Korea Society of Computer and Information
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• v.3 no.2
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• pp.131-138
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• 1998

In usual statistical data analysis, we describe statistical data by exact values. However, in modem complex and large-scale systems, it is difficult to treat the systems using only exact data. In this paper, we define these data as fuzzy data(ie. Linguistic variable applied to make the member-ship function.) and Propose a new method to get an analysis of fuzzy survey data based on the maximum entropy Principle. Also, we propose a new method of discrimination by measuring distance between a distribution of the stable state and estimated distribution of the present state using the Kullback - Leibler information. Furthermore, we investigate the validity of our method by computer simulations under realistic situations.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2006.05a
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• pp.314-317
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• 2006

Electroformed part is widely used in modem manufacturing industries, especially semi-conductor division. It is basically a specialized form of electroplating. So, it has very similar parameters with electroplating. The object of this study is development of the fine metal mask by electroforming process. In this paper considered two parameters. The first is relationship of UV exposure and soft baking time. The other one is thickness uniformity of electroformed parts by distance of between electrodes. This paper presents the fabrication method of fine metal mask by electroforming process.

• Journal of the Korean housing association
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• v.10 no.4
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• pp.101-109
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• 1999

The Japanese style official residence were built by Chosun bank during the Japanese colonial period. The purpose of this study is to find out the architectural meanings of Chosun bank's official residence, its influences on Korean modem dwellings through trace of the original form and actual survey on the residence. We could understand influences of the rationality, also through the process of prototype's transformation and maintenance's change, we can know that the residence's modernizing process don't have the inflow onesidedly but the process of the collision and the assimilation to the differences between the residential sense and one's culture.

• Journal of the Korean housing association
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• v.16 no.5
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• pp.1-12
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• 2005

This paper is architectural paper which has been studied about residential culture of Southwestern Island from 18C to now. It's main object is suggest a new residential type. Contents of research is 1, to survey a history and a cultural environment of island. 2. to survey and rearrange residence(traditional, modem) which has been built from the past to the present, and establish a history of residence and a theory. 3. to search for architectural space, shape(form), and architectural community, etc. which can be continued. 4. to suggests ideal future residence type of islands. Effectiveness of Research is 1. This study suggests a new theory and a new method to the field of residential science, especially to the residence of island area. 2. In this study, traditional theory of residence be reflected in the modern architectural design.

• Journal of Families and Better Life
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• v.21 no.5
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• pp.155-170
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• 2003

This paper will provide a basic analysis of traditional wedding artifacts as they appear on museum websites and their value for scientific research. The results of this study are as follows: 1. There were a total of 115 wedding artifacts(72 written documents related to weddings, 43 marital items) on the website of a museum. Most of them were related to the latter half of Cho-sun Dynasty. From these artifacts, we may understand the culture surrounding wedding during the transitional period from the Cho-sun Dynasty to modem time. 2. By analyzing such wedding artifacts, we can supplement existing methods of study such as literature research and case histories. In this way, we may better understand the history and culture of weddings. 3. In order to gain a deeper understanding of the culture of weddings we need to adopt a more interdisciplinary approach of wedding artifacts.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.14 no.2
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• pp.41-54
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• 2003

In addition to the development of modem telecommunication systems, the antenna is essential structure to transmit the information energy efficiently. Especially, the miniaturized antenna is more needed to ensure the mobility of the communication system. In this paper, the miniaturized antenna operating at the relatively lower frequency and working at the high power with low-profile structure and wideband characteristics are investigated by using the simulation process and measuring the fabricated antenna.

• Transactions of The Korea Fluid Power Systems Society
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• v.2 no.3
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• pp.6-11
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• 2005

A household gas valve is used for flow control of LPG(Liquefied Petroleum Gas) or LNG(Liquefied Natural Gas) of which pressure is about $200mmH_2O(\fallingdotseq\;0.0196[bar])$. Currently, two kinds of valves such as rotary type and button type are widely used in many applications. But, these valves have some problems that they are not controllable and reliable. Piezo actuation combined with modem microelectronics provides a reliable, quiet, low energy, infinitely adjustable gas valve. In this paper, gas valve using piezo actuator which are bimorph and a circle type was studied. Also, Prototype for gas valve was manufactured and characteristics of the prototype gas valve were analyzed.