• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 추계 학술논문 발표대회
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• pp.162-163
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• 2016

Conventional window cleaning method has a number of limitations, for example, workers dependent and high crash risk. The purpose of this study is to derive the performance requirements of a window cleaning apparatus through technology survey. For this, we investigated the domestic and international patents related to window cleaning, and interviewed experts in the field of window cleaning and mechanical design. Through this research, we have proposed performance requirements of the window cleaning apparatus.

• 로봇학회논문지
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• 제7권4호
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• pp.243-251
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• 2012

In this paper, developing of a pool cleaning robot is addressed. First, we analyze commercial pool cleaning robot mechanisms, and the merits and demerits of wireless version of a pool cleaning robot is introduced. And then the water-jet moving mechanism for a pool cleaning robot is proposed to improve energy efficiency and mechanical design advantage, which is one of the strong candidates for wireless pool cleaning robots. Next, the method of cleaning performance evaluation of pool cleaning robots is firstly defined with five key factors, and it was verified by experimental results. If the cleaning performance can be quantitatively defined, we can design optimally a pool cleaning robot, which results in the cost down.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2011년도 춘계 학술논문 발표대회 2부
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• pp.89-90
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• 2011

External wall cleaning is a task that is currently being performed by human workers. The recent surge in the number of high-rise buildings has led to such problems as difficulties in cleaning the wall, high risk to the specialized workers, and increased maintenance expenses. As a fundamental measure to perform external wall cleaning work in a safer manner, automation/mechanization has been on the rise. This research aims to classify façade types and analyze the performance requirements of a wall-cleaning robot, as preliminary research to develop a wall-cleaning robot. The replacement of specialized workers with robots is expected to improve both safety for workers and quality of cleaning.

• 한국전기전자재료학회논문지
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• 제22권2호
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• pp.114-118
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• 2009

PVA (polyvinyl alcohol) brush cleaning method is a typical cleaning method for semiconductor cleaning process especially post-CMP cleaning. PVA brush contacts with the wafer surface and abrasive particle, generating the contact rotational torque of the brush, which is the removal mechanism. The brush rotational torque can overcome theoretically the adhesion force generated between the abrasive particle and wafer by zeta potential. However, after CMP (chemical mechanical polishing) process, many particles remained on the wafer because the brush was contaminated in previous post-CMP cleaning step. The abrasive particle on the brush redeposits to the wafer. The level of the brush contamination increased according to the cleaning run time. After cleaning the brush, the level of wafer contamination dramatically decreased. Therefore, the brush cleanliness effect on the cleaning performance and it is important for the brush to be maintained clearly.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.1024-1027
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• 2005

This paper describes the performance index of mobile robot and development of testbed which is used to evaluate the index. The developed testbed has rectangular structure similar to a living room of home. It is semi-automation testbed system for evaluation of cleaning performance index. This system is composed with scattering and cleaning equipment of test materials, equipment rifting of objects in inner space and sides itself, vision processing system. To be consistent of performance evaluation of cleaning robot, we make use of camera in this system for the sake of measurement of robot s mobility, path and suction quantity.

• 한국정보과학회논문지:소프트웨어및응용
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• 제35권5호
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• pp.297-305
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• 2008

청소 로봇은 지도 작성 및 위치 인식을 기준으로 청소 방법을 랜덤(random)방식과 매핑(mapping)방식으로 분류 할 수 있다. 랜덤방식은 지도를 작성하지 않아 가격경쟁력이 있지만 효율이 떨어진다. 반면, 매핑방식은 지도를 작성하므로 청소 효율이 높지만 상대적인 가격경쟁력이 떨어진다. 그러므로 랜덤방식과 매핑방식의 문제점들을 보안하기 위해 본 논문은 고가의 센서 정보를 사용하지 않고 사람이 청소 로봇에게 청소 공간에 대한 정보를 알려주며, 이 정보를 이용하여 기존의 청소 로봇보다 효율적이고 저렴한 청소 로봇을 제안한다. 또한 기존의 청소 로봇과 본 논문에서 제안한 청소 로봇과의 성능 비교를 통해서 본 논문에서 제안한 방식의 효율성을 보인다.

• 청정기술
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• 제17권2호
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• pp.117-123
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• 2011

본 연구에서는 중고 디지털 레이저 복합기의 재제조 과정에 초음파세정공정을 도입하기 위하여 예비실험을 통하여 여러 가지 세정제의 세정성을 평가하고 초음파 세정공정의 공정 변수를 변화시키며 최적의 세정제와 공정변수를 도출하였다. 우선 기존에 현장에서 사용되어 지고 있던 세정제보다 세정효율이 뛰어나고 사용하기 좋은 제품을 찾고자 기존 세정제 (A)와 시판되고 있는 7종의 세정제(B~H)를 선정하여 육안판정법을 이용한 오염물질(유성오일, 토너가루, 구두약)에 대한 세정성 평가를 수행하였다. 또한 선별과정으로 물성 명가 및 거품성 실험을 진행하였다. 각 오염물질에 대한 세정제의 세정성 평가에서 기존에 사용되어지던 A세정제보다 G세정제가 뛰어난 세정효율을 보여주었고, 거품성 평가에서 기존 세정제와 유사한 거품성을 나타내었다. 실제 오염된 레이저 복합기 부품들을 대상으로 예비실험에서 우수한 세정능력을 보여준 세정제를 사용하고 초음파 주파수와 세정시간을 변화시키며 최적 공정변수들을 도출하였다. 28 kHz의 초음파 세정을 이용하여 현장적용을 한 결과 G세정제가 A세정제보다 뛰어난 세정효율을 보여주어 디지털 레이저 복합기 재제조 과정에서의 세정제로서 G세정제가 적합하다고 판단되며 전체적인 재제조 공정의 생산성 및 경제성 향상이 기대된다.

• 한국신뢰성학회지:신뢰성응용연구
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• 제18권1호
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• pp.66-71
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• 2018

Purpose: Performance recovered from SCR through cleaning was studied, measuring differential pressure, NOx reduction efficiency, fuel consumption and engine power before and after cleaning. Ideal cleaning intervals are proposed based on SCR mileage and differential pressure. SCR endurance and reliability improvements through cleaning were studied through physicochemical testing of SCR durability at 43,000km 50,000km, and 110,000km respectively. Methods: Engine power, fuel consumption and exhaust gas were measured using engine full load tests and ND-13 MODE by installing the SCR before cleaned at total engine mileages of 400,000 km, 300,000km and 200,000km. The same tests were performed after cleaning the SCR catalytic converter. Endurance and reliability of the SCR cleaning was studied through the same test by SCR catalyst after each 43,000km 50,000km, 110,000km, durability test on SCR cleaning. Conclusion: We confirmed the low-performance of the SCR due to clogging is restored by SCR cleaning technology. The NOx reduction efficiency was restored to 82%, 86% and 88% from 69%, 72% and 79%. As well as the NOx reduction efficiency, it was confirmed that the engine power, fuel consumption and back pressure was restored to fresh SCR levels. As a result of the durability and reliability achieved through SCR cleaning, we confined the appearance and reduction efficiency through visual inspection and ND-13 MODE are similar to new SCR catalysts. Finally, it was judged that there was no change in performance even when driving the SCR without cleaning throughout the 100,000 km mileage warranty.

• Journal of Mechanical Science and Technology
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• 제17권11호
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• pp.1801-1811
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• 2003

An experimental study was conducted to investigate the effects of air-side fouling and cleaning on the performances of various condenser coils used in unitary air-conditioning systems. A total of six condenser coils with different fin geometry and row number were tested. Performance tests were performed at three different conditions: clean-as-received, after fouling, and after cleaning. In all cases, it was observed that the fouling was mostly confined to the frontal face of the heat exchanger as reported in the previous investigations. The amount of deposited dust was more dependent on fin geometry for the single-row heat exchangers than for the double-row heat exchangers. The predominant effect of fouling was to cause a more significant increase in air-side pressure drop than a degradation in heat transfer performance. For the single-row heat exchangers, the pressure drop increased by 28 to 31%, while the heat transfer performance decreased by 7 to 12% at the standard air face velocity of 1.53 m/s depending on fin shape. For the double-row heat exchangers, the pressure drop increased by 22 to 37%, and heat transfer performance decreased by only 4-5% at the same air face velocity. Once the contaminated coils were cleaned according to the given cleaning procedure the original performance of the heat exchangers could almost be recovered completely. The pressure drop could be restored within 1 to 7% and the heat transfer performance could be recovered to within 1 to 5% of the originally clean heat exchangers. Therefore, it is concluded that a periodic application of the specified cleaning technique will be effective in maintaining the thermal performance of the condenser coils.

• 대한조선학회 특별논문집
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• 대한조선학회 2009년도 특별논문집
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• pp.35-39
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• 2009

The fouling around the surface of hull and propeller caused by marine organism and sea water occur in the vessel which is taken up mooring in a quay for a quite long time. Moreover, those are able to give rise to the loss of speed performance. The purpose of underwater cleaning is to improve the performance of vessel and customer satisfaction through management for fouling condition of propeller and hull. Therefore, systematic approach in connection with underwater cleaning is required so as to obtain the stable speed performance. As a result, we evaluate the effect of propeller polishing to speed performance from the case of 115K COT and 4,250 TEU Container Ship. In addition, we issue the importance of underwater cleaning through comparison of speed results depending on conditions of hull surface painted by silicon.