• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2008.04a
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• pp.337-339
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• 2008

실내에서 많은 시간을 보내는 현대인들에게 있어서 공기 청정기는 필수품이 되어가고 있다. 이런 상황에서 현재 출시된 대부분의 공기 청정기들은 본체에 장착된 센서만을 이용하기 때문에 효율적인 제어가 어렵다. 따라서 본 논문은 센서 네트워크를 이용하여 보다 효율적으로 공기 청정기를 제어하는 알고리즘을 제안한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.233-236
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• 2023

본 논문에서는 주거지역에서 철도 운행으로 발생하는 소음, 진동, 미세먼지가 거주민들에게 입히는 피해를 최소화 하기 위해 소음, 진동, 미세먼지의 수치 위험도 기준을 정하고, 아두이노 센서와 모듈로 스마트 창문 및 공기 청정기를 제작한다. 센서를 통해 수집한 데이터가 기준치를 초과할 경우 창문의 개폐 또는 공기 청정기 시스템이 작동을 하도록 구현하여 소음, 진동, 미세먼지 피해를 최소화 하도록 구현하였다.

• Air Cleaning Technology
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• v.31 no.3
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• pp.39-46
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• 2018

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.22 no.2
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• pp.109-114
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• 2022

Recently, since fine dust has become a serious social problem, air purifiers are in the spotlight as a countermeasure against this. Therefore, in this paper, we conducted R&D on the Smart Autonomous Moving Air Purifier System. The developed Smart Autonomous Moving Air Purifier can improve the limitations of the standard used area of existing air purifiers and perform an air purification function efficiently. In addition, we developed App and Web-based programs together for convenient use of Smart Autonomous Moving Air Purifier. Easily operate three air purification modes (Selection mode, Autonomous highest zone mode, Autonomous instant purification mode) through the App and conveniently monitor statistical values (Recent data, Total data, Warning) anywhere through the Web. And, we showed through test that the proposed Smart Autonomous Moving Air Purifier is more efficient than existing air purifiers.

• Journal of Advanced Marine Engineering and Technology
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• v.41 no.1
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• pp.44-49
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• 2017

In this research, a purifying system using a centrifugal filter equipped with a water separation component has been studied. Oil utilized for lubrication and cooling in marine engines becomes unable to achieve its original purpose over time as the accumulation of solid particles and water increases. Therefore, methods applying the Bernoulli equation to eliminate water in oil were investigated and proposed. As a result, a practical purifying system was designed and tested by an officially certified organization. The new purifying system is anticipated to contribute to the extension of the lifetime of oil in addition to damage reduction methods of mechanical parts.

• Air Cleaning Technology
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• v.25 no.3
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• pp.8-15
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• 2012

• Journal of Energy Engineering
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• v.11 no.4
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• pp.306-316
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• 2002

ln this paper, flowfields inside the various rooms have been investigated. A storage room, a liv-ingroom with a kitchen in an apartment, and a hospital room are considered in the present calculations. In all cases, it was found that the average of air change rate is. similar to that of perfect mixing assumption and the location of air purifier has little effects on the average air change rate. Detailed local air concentrations show that there are regions where air is not quite purified because of non-uniform circulation of air flow. The location of air purifier has great effects on this behavior.

• Clean Technology
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• v.21 no.4
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• pp.229-234
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• 2015

Recently, there are increasing numbers of study regarding hydrogen fuels but researches on desulfurization of diesel are rare. In this study, we performed diesel desulfurization reactor design by computation fluid dynamics simulation. By analyzing the change in flow and sulfur concentration at the outlet according to the changes in flow rate, reactor length, and reactor diameter, we have found the minimum catalyst performance for the given flow rate condition and the relation between the reactor performance and the reactor size and shape. We also studied the effects of permeability of the packed bed on the flow and sulfur concentration distribution. The present work can be utilized to design a diesel desulfurization reactor for a fuel cell used in ships. Furthermore, the present work also can be used to design low sulfur diesel supply in oil refineries and therefore contribute to the development of clean petrochemical technology.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2002.11a
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• pp.173-174
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• 2002

실내 공기질은 재실자의 건강과 쾌적성 뿐만 아니라, 생산성 및 작업능률에도 영향을 미치며, 산업화와 자동차의 증가로 인한 대기오염은, 실내 공기질에 악영향을 미치고 있다. 또한, 에너지 절약을 위한 건물의 밀폐화와 환기율의 감소로 실내공기오염에 대한 관심도 증가되고 있다. 이는 결국, 보다 체계적이고 실용적인 공기정화 시스템의 필요로 이어지며, 그런 의미에서 현재 많은 상용 공기청정기에 대한 보다 효과적인 평가가 필요하다. (중략)

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.47 no.5
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• pp.335-343
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• 2019

The third stage of the KSLV-II is equipped with the reaction control system that performs three axis-control during non-thrust coasting phase and performs a roll axis control during thrust phase. Toxic propellants such as hydrazine have been used for conventional rocket propulsions, however, recently, more studies have been conducted on the use of non-toxic eco-friendly propellants such as ADN and HAN. Especially, hydrogen peroxide has received a growing focus as an emerging propellant. It is considered an alternative of the toxic propellants because of economic advantage in producing the system, conducting operation test, and evaluation of the test result. In this paper, we describes the design, prototype, testing and evaluation of the test results with the 50 N-level hydrogen peroxide monopropellant thruster system which is currently under development.