• Membrane and Water Treatment
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• v.14 no.3
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• pp.129-140
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• 2023

The appropriate injection of H₂O₂ is essential to produce hydroxyl radicals (OH·) by mixing H₂O₂ quickly and exposing the resulting H₂O₂ solution to UV irradiation. This study focused on evaluating mixing device of H₂O₂ as a design factor of UV/H₂O₂ AOP pilot plant using a surface water. The experimental investigation involved both experimental and model-based analyses to evaluate the mixing effect of different devices available for the H₂O₂ injection of a tubular hollow pipe, elliptical type of inline mixer, and nozzle-type injection mixer. Computational fluid dynamics analysis was employed to model and simulate the mixing devices. The results showed that the elliptical type of inline mixer showed the highest uniformity of 95%, followed by the nozzle mixer with 83%, and the hollow pipe with only 18%, after passing through each mixing device. These results indicated that the elliptical type of inline mixer was the most effective in mixing H₂O₂ in a bulk. Regarding the pressure drops between the inlet and outlet of pipe, the elliptical-type inline mixer exhibited the highest pressure drop of 15.8 kPa, which was unfavorable for operation. On the other hand, the nozzle mixer and hollow pipe showed similar pressure drops of 0.4 kPa and 0.3 kPa, respectively. Experimental study showed that the elliptical type of inline and nozzle-type injection mixers worked well for low concentration (less than 5mg/L) of H₂O₂ injection within 10% of the input value, indicating that both mixers were appropriate for required H₂O₂ concentration and mixing intensity of UV/ H₂O₂ AOP process. Additionally, the elliptical-type inline mixer proved to be more stable than the nozzle-type injection mixer when dealing with highly concentrated pollutants entering the UV/H₂O₂ AOP process. It is recommended to use a suitable mixing device to meet the desired range of H₂O₂ concentration in AOP process.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2008.11a
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• pp.468-471
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• 2008

• Communications of the Korean Institute of Information Scientists and Engineers
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• v.25 no.1 s.212
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• pp.27-33
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• 2007

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.892-894
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• 2002

본 논문은 유한 체 GF(/2 sup m/)상에서 A$B^2$연산을 위해 AOP(All One Polynomial)에 기반한 새로운 MSB(Most Significant bit) 유선 알고리즘을 제시하고, 제시한 알고리즘에 기반하여 병렬 입출력 세미시스톨릭 구조를 제안한다. 제안된 구조는 표준기저(standard basis)에 기반하고 모듈라(modoular) 연산을 위해 다항식의 계수가 모두 1인 m차의 기약다항식 AOP를 사용한다. 제안된 구조에서 AND와 XOR게이트의 딜레이(deray)를 각각 /D sub AND$_2$/와/D sub XOR$_2$/라 하면 각 셀 당 임계경로는 /D sub AND$_2$+D sub XOR/이고 지연시간은 m+1이다. 제안된 구조는 기존의 구조보다 임계경로와 지연시간 면에서 보다 효율적이다. 또한 구조 자체가 정규성, 모듈성, 병렬성을 가지기 때문에 VLSI 구현에 효율적이다. 더욱이 제안된 구조는 유한 체상에서 지수 연산을 필요로 하는 Diffie-Hellman 키 교환 방식, 디지털 서명 알고리즘 및 EIGamal 암호화 방식과 같은 알고리즘을 위한 기본 구조로 사용할 수 있다. 이러한 알고리즘을 응용해서 타원 곡선(elliptic curve)에 기초한 암호화 시스템(Cryptosystem)의 구현에 사용될 수 있다.

• Membrane and Water Treatment
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• v.3 no.3
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• pp.181-200
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• 2012

At present water crisis is not an issue of scarcity, but of access. There is a growing recognition of the need for increased access to clean water (drinkable, agricultural, industrial use). An encouraging number of innovative technologies, systems, components, processes are emerging for water-treatment, including new filtration and disinfectant technologies, and removal of organics from water. In the past decade many methods have been developed. The most important membrane-based water technologies include reverse osmosis (RO), ultrafiltration (UF), microfiltration (MF), and nanofiltration. Beside membrane based water-treatment processes, other techniques such as advanced oxidation process (AOP) have also been developed. Some unconventional water treatment technology such as magnetic treatment is also being developed.

• Proceedings of the Korea Contents Association Conference
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• 2005.05a
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• pp.416-421
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• 2005

In order to use component for various domain, it need to add tangling code. Component reuse suffers from it. AOP was resolved this problem. We present in this paper a component model, called fractal, that added aspect interface using mixin class named joinController interface. Mixin class are used to combine controller object and interceptor object. we design the dynamic weaver that use the decorator pattern, for increase the reuse of aspect.

• Journal of the Korea Institute of Building Construction
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• v.6 no.2 s.20
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• pp.65-72
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• 2006

The amount of water demand at large buildings is increasing with the concentration of population to city and a rise in the standard of living in the city area. In this reason the Water Shortage is expected and a problem of water pollution by the city sewerage is increasing. One of method of saving city water demand and city sewer is applying recycling water system witch make used water reuse by purification of water. The application of recycling water system witch make used performed since the application of Lotte World Complex. But the popularization of this system is not activated because of cost problem and feeling of people to the water recycled. So in this study, provide application method for recycling water system by propose the estimation method of optimal sizing of recycling water system.

• Journal of Korea Society of Industrial Information Systems
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• v.9 no.1
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• pp.43-48
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• 2004

This paper presents new architectures based on the linear feedback shia resister architecture over GF(2m). First we design a modular multiplier and a modular squarer, then propose an architecture by combing the multiplier and the squarer. All architectures use an irreducible AOP (All One Polynomial) as a modulus, which has the properties of all coefficients with '1'. The proposed architectures have lower hardware complexity than previous architectures. They could be. Therefore it is useful for implementing the exponentiation architecture, which is the con operation in public-key cryptosystems.

• Proceedings of the Korean Information Science Society Conference
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• 2005.07b
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• pp.400-402
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• 2005

동적 Aspect 프로그래밍(Aspect-Oriented Programming : AOP)은 로깅과 같은 비 기능적인 부분을 모듈화할 수 있도록 해주는 새로운 프로그래밍 기법이다. AOP는 절러 클래스에 영향을 미치는 행위들을 재사용 가능하도록 Aspect로 캡슐화 시켜준다. 기존의 Aspect 위버(weaver)에서는 Aspect를 위빙 할 경우, 새로운 서비스나 메소드를 추가하고자 한다면 서브클래스를 별도로 상속을 해주어야하며, 이로 인해 코드의 라인수가 증가되며, 수행 시간도 느려지게 된다. 이러한 문제점을 해결하기 위하여 동적 Aspect 위버 상에 Decorator 패턴을 적용하여 별도의 서브클래스를 상속하지 않고, 필요한 메소드만을 추가하여 위빙시키고, Aspect의 join point에 훅(hook)을 첨가하여 불필요한 메소드의 실행을 제거해준다. 이로 인해 수행속도와 재사용성을 증가시킬 수 있게 된다.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.318-321
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• 2010

임베디드 소프트웨어를 테스트하고 디버깅하려면 기능 분석, 프로세스 추적, 메모리 디버깅 등 다양한 기술들이 존재한다. 하지만 테스터가 임베디드 시스템 내부의 컴포넌트들의 사이에 결함을 발견하고 그 위치를 찾아야 하는 경우, 디버깅 기술과 도구만으로는 한계가 있다. 만약 테스터가 테스트 도구를 이용할 경우 이런 단점을 보완할 수 있지만 다양한 임베디드 시스템 환경에서는 테스트 환경만을 구축하는 데도 많은 노력과 시간이 소요된다. 따라서 이러한 문제 해결하기 위하여 본 논문에서는 관점 지향 프로그래밍(Aspect-Oriented Programming)을 사용한 후크(Hook) 개념을 적용하여 새로운 테스팅 아키텍처를 제안한다.