• The Journal of Engineering Geology
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• v.19 no.3
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• pp.307-311
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• 2009

Agricultural is recognised as being the leading contributor to groundwater. As a consequence, the consumer have to has bear the high expenses of water supplied to be treated. Importantly, the cost of water supplied is a function of the water quality as well as the scale of drinking water treatments. The relationship between the consumer payment and water quality improvement was affected by the scale of drinking water treatments directly. Hence when we achieve the high quality and low cost in the case of groundwater treatment for drinking, it is needed to consider both water quality and plant scale.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.31-32
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• 2014

다중의 명령어를 동시에 수행할 수 있는 멀티코어 시스템의 특성으로 하나의 시스템 내에서 태스크를 수행하면서 외부 이벤트의 발생에 의한 인터럽트를 동시에 처리할 수 있다. 각 태스크가 처리되어야 하는 시간에 제약성을 갖는 실시간 시스템에서는 스케줄러에 의해 CPU 코어에서의 수행이 제어되어야한다. 본 논문에서는 최적이라고 알려진 Pfair 멀티코어 스케줄러의 각 코어별 유휴시간을 정량적으로 평가함으로써 인터럽트 처리의 지연시간을 분석한다.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.1452-1456
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• 2008

우리나라 주요 상수원인 낙동강, 금강 등의 수질이 급격히 악화됨에 따라, 기존의 정수방법에 어려움이 발생되고 있다. 과거 염소에 의존한 수처리방법이 많이 사용되어 왔으나, 1989년 이후 중금속, THM(Trihalomethane), 페놀사건, 벤젠 등 각종 수돗물 유기물질 오염사고가 다발하면서, 활성탄 및 오존$(O_3)$ 등을 이용한 다양한 처리 시설들이 도입되기 시작했다. 이중 강력한 산화력을 지니고 있는 오존의 경우, 상수처리, 폐 배수처리, 식품의 살균 및 보관, 나아가 반도체 제조공정중의 포토레지스터의 제거에 이르기까지 폭넓게 사용되고 있다. 그러나 오존이 가지는 뛰어난 정화능력에도 불구하고, 막대한 설치비용 및 운전비용의 문제로 하수처리장과 같은 대규모 시설에서는 도입되지 못하고 있었다. 이러한 문제점을 극복하고자 본 연구에서는 재생 가능한 에너지를 오존시스템의 전력원으로 대용시킴으로써, 그 효과를 극대화시키고자 하는데 목적이 있다. 에너지 밀도가 낮지만, 지역 의존성이 적고, 청정한 무한 에너지인 수력, 풍력 및 태양에너지를 혼용한 오존 발생시스템은 소규모의 연못이나 농촌의 저수지 같은 유역뿐만 아니라, 농촌폐수로 인해 오염된 지하수의 국소지역에 대한 수처리에 사용될 수 있다.

• Membrane Journal
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• v.9 no.4
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• pp.193-201
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• 1999

The object of study were the development of membrane process and the optimization of operation condition for membrane system, which was used the pre-treatment system of tap water treatment in steady of conventional process such as coagulation, sedimentation. The higher steady flux is very important factor, by a suitable pre-treatment and optimization of operating condition such as fouling control, crossflow and backwashing method, in membrane system. So, we were observed the effect of flux decline for membrane used by 4 type ultrafiltration(UF) membrane pre-treatment process, and optimized the operation condition of filtration system under various MWCO(Molecular weight cut-off), operation pressure, linear velocity and temperature to maintain higher flux. From these experiment, we were identified that UF process showed a slower flux decline rate and a higher flux recovery than microfiltration(MF) membrane. The water quality of UF permeate was better than that of MF, and was not effected pre-treatment process. In the operation condition, the rate of flux decline was diminished by a higher linear velocity and operation temperature, lower pressure.

• Journal of the Korea Computer Industry Society
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• v.2 no.6
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• pp.817-826
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• 2001

In this paper, the method of processing a blurred noisy signal has been researched. The conventional method of processing signal has faults which are slow-convergence speed and long time-consuming process at the singular point and in the ill condition. There is the process, the Gauss-Seidel's method to remove these faults, but it takes too much time because it processes signal repeatedly. For overcoming the faults, this paper shows a signal process method which takes shorter than the Tikhnov-Miller's by comparing the Tikhnov-Miller's with proposed algorithm and accelerating convergence speed at the singular point in the ill condition. In this paper, the conventional process method and proposed optimal algorithm were used to get a standard image (256 ＊ 256 ＊ 8bits),and then the results are simulated and compared each other in order to examine the variance of MSE ( Mean-Square Error ) by the acceleration parameter in the proposed two dimensional signal procedures. The result of the signal process and the processing time was measured at all change of acceleration parameter in order to verify the effectiveness of the proposed algorithm.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.23-25
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• 2021

포화 이진 트리를 기반으로 하는 상수 분지수 3의 새로운 그래프 TG_n를 제안한다. TG_n의 노드 주소는 n개의 비트로 나타내며, 노드 수는 2ⁿ개이고 지름은 2n-2다. 에지는 3가지로 분류할 수 있으며, 루트 노드와 연결된 에지, 중간 노드와 연결된 에지, 말단 노드와 연결된 에지가 있다. 트리를 기반으로 한 TG_n의 깊이는 편의상 index N으로 나타낸다. index는 노드 주소를 S라 할 때, S가 0이면 0이고 1 이상이면 ⌊log₂S+1⌋이다. 본 연구에서는 상수 분지수를 갖는 TG_n을 정의하고, 라우팅 알고리즘과 지름을 분석한다.

• Journal of Environmental Science International
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• v.7 no.3
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• pp.409-413
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• 1998

Polyamine was synthesized for the drinking water treatment. Polyamine was produced by the two step polycondensation of dimethytamine(DMA) and epichlorohydrin(EPI) and its properties were characterized. The effects of mole ratio of (DMA1/1EPl), reaction temperature and reaction time on synthesis of polyamine were investigated. Polyamine flocculant was applied to Nak-dong river raw water to examine its efficiency in reducing turbidity. The synthesized polyamine was effective as flocculant for drinking water treatment. The addition of 1 mg/L of polyamlne flocculant caused the reduction of 50% PAC (polyaluminium chloride).

• The Journal of Korean Institute of Communications and Information Sciences
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• v.19 no.10
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• pp.2001-2013
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• 1994

In this paper, the method of processing a blurred noisy image has been researched. The conventional method of processing signal has faluts which are slow convergence speed and long time-consuming process at the singular point and or in the ill condition. There is the process, the Gauss Seidel's method to remove these faults, but it takes too much time because it processed singnal repeatedly. For overcoming the faults, this paper shows a image restoration method which takes shorter than the Gauss-Seidel's by comparing the Gauss Seidel's with proposed alogorithm and accelerating convergence speed at the singular point and/or in the ill condition. In this paper, the conventional process method(Gauss-Seidel) and proposed optimal algorithm were used to get a standard image($256{\times}56{\times}bits$). and then the results are simulated and compared each other in order to examine the variance of MSE(Mean Square Error) by the acceleration parameter in the proposed image restoration. The result of the signal process and the process time was measured at all change of acceleration parameter in order to verify the effectveness of the proposed algorithm.

• The KIPS Transactions:PartA
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• v.14A no.3 s.107
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• pp.151-158
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• 2007

Quadtree, which is a hierarchical data structure, is a very important data structure to represent images. The linear quadtree representation as a way to store a quadtree is efficient to save space compared with other representations. Therefore, it has been widely studied to develop efficient algorithms to execute operations related with quadtrees. The computation of block location is one of important geometry operations in image processing, which extracts a component completely including a given block. In this paper, we present a constant time algorithm to compute the block location of images represented by quadtrees, using three-dimensional $n\times n\times n$ processors on RMESH(Reconfigurable MESH). This algorithm has constant-time complexity by using efficient basic operations to deal with the locational codes of quardtree on the hierarchical structure of $n\times n\times n$ RMESH.

• Communications of Mathematical Education
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• v.13 no.2
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• pp.535-547
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• 2002

본 논문은 교육현장에서 자바(Java)를 이용한 수치계산 애플릿(Applet)을 개발할 경우 수식을 인식하여 그 결과를 실행하고 보여주는 심볼릭 연산을 구현하기 위한 알고리즘 개발과 다양한 입력식을 처리하기 위한 효율적인 자료구조를 제안한다. 구현된 패키지내의 클래스는 변수와 상수, 다양한 연산자를 처리하기에 적합하며 분석된 정보를 통해 사칙연산의 처리, 연산자 우선순위의 처리, 심볼릭 연산, 다항식, 방정식, 함수의 그래프 작성, 간단한 미적분 처리를 하는 알고리즘을 제안한다.