• Journal of Korean Society of societal Security
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• v.3 no.2
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• pp.47-55
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• 2010

It was developing of portable hybrid water purification system for clean water production in the disaster area. because there are no way to supply a drinking water to the victims of calamity. currently, the government has been supplying bottled water to victims. but it is a limit to the reserves. It is composed of a filter, a feed pump, a solar-cell, a controller, and a case and is possible supplying a drinking water not to limit time and a place. Field test was carried out to developed portable water purification system and the purified water was satisfied a criterion for a drinking water.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2000.10a
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• pp.239-242
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• 2000

Bluetooth is generally called as wireless technology$.$standard$.$product for communicating in a short distance which is in order to implement both-sides short distance telecommunications at low price without complicated electric wires. SIC is the cooperation group which is composed of telecommunications, computer, eminent network firms for technological development and building the market. It actually made a scheme for standardization. SIG, Ericsson takes a main role in SIG. is composed of about 1,800 member companies and the members are increasing continuously. It was announced Bluetooth version 1.0 from SIG August 1999 and the products such as software development kits, core components will come out soon later. In this paper, Bluetooth technological development and the present state of standardization are investigated and analyzed.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2004.04a
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• pp.141-144
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• 2004

Aids to Navigation have been operated and placed along coasts and navigable waters as guides to mark safe water and to assist mariners in determining their position in relation to land and hidden dangers, controled on the basis of the maine traffic survey. The traditional survey have been conducted by some methods like an ocular observation using portable radar, a on-the-spot survey, a questionnaire. But these methods must have a lot of manpower and expenses. In this paper, we have developed the module which have some real time processing functions like making a database of radar image using PC camera, saving of the vessel's track, analysis if the maine traffic tendency and the distribution of density.

• Journal of IKEEE
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• v.17 no.4
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• pp.550-558
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• 2013

In this paper, we propose an efficient hybrid lighting management system implementation on multiple protocol. The proposed hybrid lighting management system was implemented by configured as the data display part for management and control of lighting device and the data conversion-processing part the communication part of gateway. The data were designed the DB to enable to storage in real-time, and implemented able to manage by real time wireless remote control and schedule setting. The proposed an efficient hybrid lighting management system, it was possible the real-time monitoring and remote lighting control by peristalsis with smart devices and portable PC etc., and it could be obtained reduction effect of energy and electricity, communication cost.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2001.04a
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• pp.199-202
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• 2001

An elevator system, which is essential equipment for vertical movement of an object, as a property of building, has been driven by various expenditures and purposes. Since developing electrical control technology, control system are highly developed. The elevator system has expanded widely, but a data accuracy acquisition technique and safety predict technique for securing system safety is still at a basic level. So, objective verification for elevator confidence condition requires an absolute accuracy measurement technique. Therefore, this study is executed in order to acquire a method of depending on sense of a manager with simple numeric measurement data, and to construct a logical, analytical foresight system for more efficient elevator management system. As an artificial intelligence for diagnosis, the fuzzy inference algorithm is used for foreseeing the system in this thesis, because the fuzzy algorithm is the most useful method for resolving subjective ideas and a vague judgment of humans. The fuzzy inference algorithm is developed for each sensor signal(i.e. vibration, velocity, current).

• Journal of IKEEE
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• v.17 no.3
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• pp.301-308
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• 2013

In this paper, we propose the hybrid lighting control system on multiple sensor. The proposed hybrid lighting control system was designed for management and control of street lightings by configured as the data display part of integration-interworking part, the data conversion-processing part of integrated management part, and the communication part of gateway system. The data are implemented to designing the DB to enable to storage in real-time by enable to monitoring by wireless remote control and schedule set. As a result of the efficiency verification of the proposed hybrid lighting control system, the hybrid lighting control system be to the real-time monitoring and remote lighting control was possible, because to peristalsis with smart devices and portable PC etc., and it could be obtained the effect of energy and electricity, communication cost reduction.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.21 no.8
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• pp.462-467
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• 2009

Researches and developments on BEMS are performed world-widely through sustainable management in various conditions. However, there are many obstacles to adapt the system in existing buildings because it needs highly expensive equipments, which are designed for newly built buildings, to install. Therefore, there are numerous limits exist when applying the BEMS in established buildings. The purpose of this study estimates the optimization of RF output power in WSN(Wireless Sensor Networks), which is the essential technology to develop PEMS. The results of this study is as follows ; 1) Applying WSN technique in buildings was possible. 2) As RF output power increases, the number of relay node reduced, therefore, the WSN showed more stability. 3) When estimating optimal RF output power in school, it should be considered between the number of relay node and RF output power. 4) Considering battery consumption and possibility of reception, the best suited RF output power is -20dbm in apartment house.

• Journal of the Society of Naval Architects of Korea
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• v.49 no.5
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• pp.400-409
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• 2012

It is not easy to know the accurate mass and mass moment of inertia of robot. Because of this uncertainty, error may exist when we control the robot based on the inaccurate mass information. Moreover the properties of the portable robot can change during its operation. Therefore we developed the motion simulator based on the adaptive control. First, the computed torque control was carried out in order to minimize an error between target angles and real angles. The computed torque control is based on the equation of robot motion, which is derived from the Lagrange-Euler equation. To minimize the error between the real model and the approximated model, the adaptive control was carried out. During this simulation, the interference check was also carried out. The interference check verifies that the robot can move successfully without any collision.

• Journal of Sensor Science and Technology
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• v.31 no.1
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• pp.57-63
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• 2022

This study describes a system that monitors the tool and cutting state of automatic beveling operation in real time. As a signal for cutting state monitoring, a motor current detected from the spindle drive system of the automatic beveling machine is used to monitor abnormal state. Because automatic beveling is processed using a face milling cutter, the cutting force mechanism is the same as the milling process. The predicted cutting torque is obtained using a cutting force model based on specific cutting resistance. Then, the predicted cutting torque is converted into the spindle motor current value, and cutting state stability is diagnosed by comparing it with the motor current value detected during beveling operation. The experimental results show that the spindle motor current can detect abnormal cutting state such as overload and tool wear during beveling operation, and can diagnose the cutting stability using the proposed equip-current line diagram.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.07a
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• pp.443-444
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• 2022

본 논문에서는 스타일러는 옷을 빨거나 다리지 않고도 마치 새옷처럼 다시 입을 수 있도록 관리해준다는 콘셉트로 등장한 의류기기이다. 출시 당시에는 생소하고 크기가 커서 큰 호응을 얻지 못했지만, 최근에는 작고 편리한 신제품을 내놓으면서 대중화 시대를 열어가고 있다. 양복을 주로 입는 회사원에서 싱글족까지 스타일러를 사용하고 있지만 대중적인 스타일러는 정해진 위치에서만 사용해야 한다는 불편함이 있다. 또한 출장이 잦은 직업이나 먼지가 많은 공간에서 일하는 직업의 경우 옷에 주름이나 먼지를 제거하지 못해 구겨진 옷을 입고 다니는 경우가 많다. 그래서 우리는 가정용 스타일러에서 장소에 구애받지 않고 사용할 수 있는 휴대용 스마트 스타일러를 제작하기로 하였다. 예기치 못한 상황에서의 중요한 자리가 있을 때 휴대용 스타일러가 있다면 준비해둔 의류를 상황에 맞춰 관리하여 다닐 수 있을 것이며, 스타일러에 온도와 습도를 보여주는 기능이 있다면 스타일러를 사용하기 전에 스타일러의 상태가 양호한지 판단할 수 있을 것이다.