• 제품안전
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• 11호통권168호
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• pp.64-69
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• 2007

• 한국재난관리표준학회지
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• 제3권2호
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• pp.47-55
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• 2010

재난 재해 발생시 즉각적인 식수 공급이 어려운 점과 재난을 대비한 생수비축의 문제점을 해결하기 위하여 현장에서 비상시 식수생산이 가능한 휴대용 정수시스템을 개발하였다. 정수시스템은 필터, 펌프, 태양전지, 충전 컨트롤러, 케이스 등으로 구성되었으며, 휴대성과 무전원 상태에서도 작동이 가능하도록 비상용 배터리와 태양전지를 갖추어 시간과 장소에 제한없이 현장에서 식수공급이 이루어지도록 하였다. 개발된 휴대용 정수시스템은 현장 성능측정 실험을 수행하였으며 실험결과 정수된 물은 먹는 물 기준을 충족하였다.

• 한국융합학회논문지
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• 제11권10호
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• pp.213-217
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• 2020

천연 광물질, 식물질, 정수장 슬러지를 이용하여 친환경적인 수수질정화제와 이를 활용하는 오폐수복합처리시스템을 개발하였다. 오폐수복합처리시스템은 오염수 유입, 수질정화제 투입, 가압부상장치 가동, 슬러지 부상, 슬러지 수거 및 처리수 배출의 과정을 거친다. 이 장치를 축분 탈리액, 육계 세척수, 공장 폐수, 하수종말처리장 및 연못의 녹조제거에 적용하여 우수한 제거율을 얻었다. 유기성 폐기물 정화에 천연 수질정화제를 활용한 예는 조사되지 못했다.

• 상하수도학회지
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• 제21권5호
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• pp.621-629
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• 2007

This study intends to investigate the characteristics of the foul smell of sewer pipes near large apartment complexes as complaints about offensive odors have drastically increased in urban residential areas. Targeting apartments where people actually complained about foul orders, the study result revealed that components in the smell of the water-purifier tank of the target apartment were very similar to those of sewage treatment plants and night soil treatment plants. Measuring components of odors inside the management layer of tank showed that the concentration of hydrogen sulfide was 10ppm, which is approximately 160 times the safety standard of 0.06ppm; the concentration of mercaptan was 0.9ppm, which is about 220 times the safety standard of 0.004ppm. The source materials of foul odors were discharged outside through ducts, and those households living near outlets producing bad smell complain that it gets worse depending on the air pressure or wind direction and strength, and they could not even open windows. As well, these source materials were transferred by discharge pumps to public sewer pipes outside the apartment complex. While discharge pumps starts operating, they remain on the sewer pipe and then begin to spread over to roads through small openings of manholes on the road. Then, the smell offends passers-by and residents near the road, leading to a lot of complaints. The study results suggest that, among the sources of foul odors in sewer pipes of residential areas, especially those from the water-purifier tank of large apartments, hydrogen sulfide should be the main target for follow-up treatment.

• 멤브레인
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• 제27권3호
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• pp.232-239
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• 2017

본 연구에서는 사용 후 폐기되는 정수기용 역삼투(Reverse Osmosis; RO)막 필터를 세정하여 새 필터의 수준으로 복원시키는 연구를 수행하였다. 화학적 세정액으로는 수산화나트륨, 중아황산나트륨, EDTA용액을 사용하였으며 마이크로버블 발생 장치와 함께 in-situ의 방법으로 세정하였다. EDTA를 0.1%의 농도로 제조한 뒤 마이크로버블과 함께 사용하여 30분 세정하였을 때 가장 좋은 결과를 나타내었다. 이때 폐 필터와 세정 후 폐필터의 성능을 비교해 보았을 때 투과도는 19.9%, 회수율은 49.5%증가하였으며 NaCl 100 mg/L 용액에 대한 염제거율은 2.3% 감소되었는데, 이는 새 필터와 동등한 수준으로 회복이 되었다. 또한 전자현미경 분석을 이용하여 막 표면의 오염물의 제거를 육안으로 확인하였다. 이로써 전량 매립 또는 소각 되어지는 정수기용 폐 RO막 필터의 세정을 통하여 재사용이 가능할 것으로 판단된다.

• 유통과학연구
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• 제14권10호
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• pp.81-91
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• 2016

Purpose - This study proposes a strategic model for the late mover to effectively penetrate an industry that is dominated by a leading company. Thus, this study presents strategic implications for several late movers in overcoming the advantages of the leading company. Research design, data, and methodology - This study begins with a literature review followed by the formation of a strategic model that consists of: Repositioning, Utilization of Competence, Strategic Leadership, and Innovation. Specifically, this research analyzes LG Electronics (LG) as an example and investigates how LG infiltrates and grows in the water purifier market, overcoming the advantages of the powerful leading company. Results - The major steps taken by LG are summarized into four. First, LG studied the market, which had been conventionally treated as a single market. To penetrate the market, LG founded a new, special market segment. Subsequently, LG further segmented the market, executing a marketing strategy for each segment. Second, the unbending will of top managers was a key factor that addressed the challenge persistently. Third, even though LG was the late mover in the water purifier market, it had several technology competences such as compressor, refrigeration cycles, and algorithms. LG had profound knowledge in technology and used it effectively. Fourth, LG created a premium market through three innovative and distinguished factors such as the stainless water tank, sterilization service, and luxury design. Conclusions - This research draws four key findings from the example of the late mover in the water purifier industry: the reestablishment of a strategic position based on environmental change is an effective strategy for the late mover; strategic leadership is an important motive to generate late mover performance; and the late mover can utilize its existing knowledge and resources to overcome the first mover, such as presenting new added value compared to existing products as an effective catch-up strategy. Consequentially, through the study of performance determinants and the market penetration strategy of the late mover, this research has significance in providing basic material for companies trying to penetrate the market.

• 생명과학회지
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• 제14권1호
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• pp.163-166
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• 2004

정수용 입상활성탄(Granular Activated Carbon, GAC)에서 발생하는 세균 생장 현상을 파악하기 위해 활성탄 칼럼을 제작하고, 수돗물을 고정식 상향류 방식으로 (EBCT = 0.92~1분) 통수시켰다. 봄에는 14일 동안 세균수의 파과(breakthrough) 현상이 없었다. 여름에는 야자계와 석탄계 활성탄 칼럼의 유출 세균수는 비슷하여 파과전에 $10^2$ CFU/ ml수준으로 유입수보다 낮았지만, 10일 이후 유출수가 $10^3$ CFU/ml 로 유입수의 $10^2$ CFU/ml보다 높은 값을 보였다. 칼럼 내부 4지점의 활성탄을 깊이에 따라 분석했을 때 유입수 유입부에 가까울수록 많은 세균수가 관찰되었고 세균군집의 활성은 유사하였다 성장하는 세균은 야자계와 석탄계 활성탄이 서로 달랐지만 Acinetobacter 속이 우점을 이루고 있는 것으로 나타났다.

• 대한안전경영과학회지
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• 제26권1호
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• pp.31-38
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• 2024

In this paper, as there are many cases of fires occurring due to the failure or inoperability of the thermostat of electronic products, the purpose is to test and analyze the risks and probabilities through fire cases and reproduction experiments, and suggest countermeasures. Among electronic products, water purifiers are composed of a refrigerant system with a compressor to make cold water, a heating device to make hot water, and an electric device used as an energy source. Due to the nature of the water purifier manufacturing, these devices are subject to a lot of moisture and dust. etc. exist in large quantities and use electrical energy, so there is a possibility of fire due to short circuit in the wire, electrical abnormal overheating (tracking phenomenon) in the thermostat, electronic board, starting relay, etc., and overheating of the heating device (Band Heater). there is. Therefore, in order to prevent fires from these devices, a system to remove foreign substances inside the water purifier is necessary, the use of heat-resistant (fire-resistant) wires for electrical devices is essential, and the use of non-combustible materials (semi-combustible materials) for each part is necessary to prevent fire. The risk must be eliminated through prevention and combustion expansion prevention devices.

• 조명전기설비학회논문지
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• 제21권8호
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• pp.64-70
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• 2007

과전압에 의한 절연파괴와 허용전류의 초과에 따른 과열 그리고 장기간 사용에 따른 절연 성능 저하 등에 의해 전기사고는 발생한다. 본 논문은 정수기에서 사용되는 PCB의 전원 제어 시스템 개선에 관한 연구로서 기존의 전원제어 시스템에서는 임펄스 형태의 서지의 경우만 바리스터 소자로 구성된 보호 시스템이 설계되어 있었다. 이러한 기존의 시스템은 임펄스 형태 이외의 과전압이 시스템에 입력되었을 경우 시스템을 보호하지 못했기 때문에 새로운 전원 제어 시스템을 설계하여 과전압으로부터 시스템을 보호하여 전기사고를 미연에 방지하고자 하는데 그 목적이 있다. 본 논문에서 제안한 전원 제어 시스템은 입력전원의 전압을 인지하여 설정된 전압 이상의 전압이 입력되는 경우 SSR(solid state relay)을 통하여 전원을 차단하여 시스템을 보호하도록 설계하였다.

• 전기학회논문지P
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• 제56권1호
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• pp.45-50
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• 2007

In this paper, this paper discusses how to improve the power control system of cold and hot water purifiers, in particular, system protecting device against abnormal voltage. The existing power supply control system came with a protecting device composed of varistor device only for impulse-type surges. Even though the existing system senses surge other than impulse-type, the system can not be protected. Accordingly, a new type of power control system was designed to protect the system from surge and ultimately prevent electricity accidents. The power control system suggested in this paper will be designed to protect the system by sensing input voltage and discontinuing power supply by means of SSR if voltage exceeding set value is sensed. To test the designed system, surge was imposed on the existing system and processes of system failure were experimented before safety of the designed power control system was simulated via P-spice program developed by Orcad in order to examine safety and reliability of the system.