수처리(응집)과정에서 형성되는 플록 밀도에 영향을 미치는 인자

정호진(Ho-Jin Chung) 계명대학교 낙동강환경원 1996 環境科學論集 Vol.1 No.1

탁도 변동에 의한 플록의 구조적 특성 연구

정호진(Ho Jin Chung) 한국수처리학회 1997 한국수처리학회지 Vol.5 No.2

During a flocculation process, the fractal aggregate has various shape and structure. Floc characteristics which are important for settling are size, effective density, and shape. It is difficult to measure the properties of flocs by direct methods, because flocs are very fragile and difficult to handle. Turbidity fluctuation techniques are useful for measurement without any breakage of floc. This method is based on the mesurements of flocculation in the intensity of light transmitted through the suspension. In this study, the observed floc size-density relationships demonstrated that floc density generally decreases with increasing floc size. The slope of size-density function changes depending on flocculating conditions. Fractal dimension D, varies depending on turbidity. It has been obtained that the value D is bigger than 2 for polymeric flocculation. This indicates that flocs are dense, small and compact. This is important information for a better understanding of the flocculation phenomenon.

고도 정수처리에서 응집공정의 개선에 의한 활성슬러지 플록의 밀도 측정에 관한 연구

정호진(Ho Jin Chung) 한국수처리학회 1998 한국수처리학회지 Vol.6 No.2

Flocculation is one of the important processes in water and wastewater treatment. The physical properties of flocs such as size and density are significant factors influencing solid-liquid separation processes. During flocculation, floc size and density can be changed depending on physical conditions. In this study, by developing new optical technique, we measure flocculation process in on-line manner to understand the flocculation phenomena in more detail. We also seek to improve the efficiency in advanced water treatment by studying the properties of bioflocs produced in activated sludge processes. The obtained results are as follows: It is found that the log-log graph of turbidity(τ) against specific turbidity(τ/φ) shows a straight line with the slope 2(m-1) or 2(2-D)/D. In this case, if we use fractal dimension(D), it is possible to interpret the structure of aggregates in three dimension. Because it is also possible to investigate the flocculation phenomena depending on various conditions, we can control the flocculation process more effectively in advanced water treatment applications. It is also found that bioflocs are shown as large and loose. If we analyse the efficiency of biological treatment by the structure of aggregates, better efficiency are obtained by increasing Hydraulic Retention Time(HRT). Although more work must be put on this, if we define structural properties of flocs in on-line manner, it is possible to investigate the flocculation processes more effectively.

응집인자 특성에 관한 연구

정호진(Ho Jin Chung),송수욱(Soo Uook Song) 한국수처리학회 2000 한국수처리학회지 Vol.8 No.1

This study analyses the characteristic properties which affect flocculation by measurement of residual turbidity using Jar-tester with industrial waste water which includes various hazardous materials. The followings are the optimum dosage of coagulant used: 299.7㎎/ℓ for aluminium sulphate, 64.9㎎/ℓ for ferric chloride, 25㎎/ℓ for PAC(Poly Aluminium Chloride) and 20㎎/ℓ for PAX(Poly Aluminium Chloride Silicate). In the case of the effect of each coagulant depending on pH, aluminium sulphate was the most effective at the alkali zone (i.e. pH 9∼12), ferric chloride was the neutral zone (i.e. pH 7∼9). PAC and PAX were less affected by pH, but well flocculated from the neutral zone (i.e. pH 6). The effect of water temperature has also been studied for the flocculation process. The difference of water temperature strongly affects on the flocculation process and the optimum temperature was normal temperature (20℃) for flocculation process. The structural properties of flocs was analysed by the observation of residual turbidity, and the volume and shape of the produced flocs. The floc structures of ferric chloride and PAC were comparatively denser and stronger than those of aluminium sulphate and PAX. The effect of flocculation of PAC and PAX was better than that of aluminium sulphate and ferric chloride. All these results could be applicable for basic reference to develop a new flocculation technique where the efficiency of flocculation has improved.

광촉매 전기 응집 및 산화 반응을 이용한 고농도폐수 처리를 위한 연구

정호진 ( Ho Jin Chung ),구봉헌 ( Bong Hun Ku ),조성훈 ( Sung Hun Cho ),전봉준 ( Bong Jun Chun ) 한국물환경학회 2004 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2004 No.-

모니터링을 통한 현탁액의 응집 특성 연구

정호진 ( Ho Jin Chung ),김형준 ( Hyoung Jun Kim ) 한국물환경학회 2010 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2010 No.-

싱가포르 초등체육 구조의 혁신적 변화에 대한 푸코의 고고학적 담론분석

정호진 ( Ho Iin Chung ) 서울敎育大學校 初等敎育硏究所 2013 한국초등교육 Vol.24 No.1

본 연구의 목적은 푸코의 사유와 저서에 바탕을 두고 형성되어 있는 고고학적 담론분석을 통하여 싱가포르 초등체육 구조의 혁신적 변화를 밝혀내는 것이었다. 이러한 목적을 달성하기 위하여 문헌 자료, 미디어 및 언론보도 자료, 심층면담을 통하여 자료를 수집하였으며, 다음과 같은 결론을 얻어냈다. 첫째, 싱가포르 초등체육 구조의 혁신적 변화를 이끌어낸 담론은 주체의 권력적 지위 ― 싱가포르 교사 교육기관의 역사적 지식의 구조, 싱가포르의 정부 주도적 교육 정책의 구조, 싱가포르 정부의 초등체육 지원을 위한 실행적 구조 ― 에 의해 구성되었다. 둘째, 싱가포르 초등체육 구조의 혁신적 변화에 대한 내용은 주체의 제도적 정위 ― 초등체육의 기술과 가치와 지식의 균형, 초등체육의 질 높은 교사 확대 배치 및 체육 시수의 증가, 초등체육의 인프라 확충 및 강화 ― 에 의해 구성되었다. 셋째, 싱가포르 초등체육 구조의 혁신적 변화에 따라 생산된 담론은 주체의 사회적 상황 ― 싱가포르의 초등체육을 둘러싸고 있는 이해관계자들의 인식 전환, 싱가포르의 초등체육에 대한 예산 지원 확대, 싱가포르 초등체육의 혁신적 변화에 따른 사회적 상황의 반영 ― 에 의해 구성되었다. The purpose of this study was to reveal the innovative changes of the primary physical education structure in Singapore using the archaeological discourse analysis which is based on Foucault`s thoughts and books. In order to achieve this purpose, data was collected through documents, media and press materials, and in-depth interviews and the following conclusions were obtained. First, the discourses which conduced to the innovative changes of the primary physical education structure in Singapore was formed by the power status of subject: the historical knowledge structure of Singapore`s institute of teacher education, the educational policy structure which is government-dominant, and the implementation structure for Singapore government to suppori primary physical education. Second, the details of the innovative changes of the primary physical education structure in Singapore were comprised of the institutional emplacements of subject: balancing knowledge with skills and values, increasing quality teacher assignment and physical education classes, expanding and enhancing infrastructure. Third, the discourses produced by the innovative changes of the primary physical education structure in Singapore consisted of social circumstances of subject: paradigm shift of stakeholders surrounding Singapore`s primary physical education, expansion of institutional support in budget allocation on Singapore`s primary physical education, and reflection of social situation according to the innovative changes of the primary physical education structure in Singapore.

건설폐기물 처리현황 및 개선방안

정호진(Ho-Jin Chung),성현석(Hyun-Suck Sung) 계명대학교 낙동강환경원 2000 環境科學論集 Vol.5 No.1

전기 도금법을 이용한 니켈추출 인자에 관한 연구

정호진(Chung Ho Jin),조성훈(Cho Sung Hun),구봉헌(Ku Bong Hun) 대한토목학회 2005 대한토목학회논문집 B Vol.25 No.5B

연구논문 : “수자원 보호”를 주제로 한 프로젝트형 수업 구성 방안 -고급 한국어 학습자를 대상으로-

정호진 ( Ho Jin Chung ) 인하대학교 교육연구소 2010 교육문화연구 Vol.16 No.1

이 논문의 목적은 프로젝트를 활용하여 외국인 한국어 학습자를 위한 한국어 수업 구성방안을 제안하는 데 있다. 프로젝트를 활용한 언어 수업은 학습자 주도적인 것으로 알려져있으나 학습자의 학습 대상 언어의 수준이 프로젝트를 수행할 만큼 갖추어져 있지 않으면 교육 효과를 기대하기 어렵다. 따라서 이 논문에서는 자율적인 프로젝트보다는 교사의 일부통제가 이루어지는 통제된 프로젝트를 활용하여 ‘수자원 보호’를 주제로 수업을 구성해 보았다. 프로젝트 수업은 계획 및 준비 단계, 수행단계, 발표 및 평가단계로 나누어 볼 수 있는데 이 논문에서는 수행 단계에 쿠레레 방법을 적용하여 구성해 보았다. 쿠레레는 학습자 개인이겪은 과거의 경험으로부터 시작하여 전진 분석 종합의 단계를 거쳐 이루어지는 방법으로 학습 후에는 학습자가 배운 “지식” 을 “삶”과 연계할 수 있다고 알려져 있다. 따라서 실천이 요구되는 환경 관련 과목이나 도덕과 수업에 널리 적용되어 연구되었다. 프로젝트와 쿠레레를 접목하여 수업을 구성하게 되면 학습자 주도형의 수업을 구성할 수 있다는 장점과 학습자의 한국어 수준이 주어진 프로젝트를 수행하기에 좀 부족하다고 하더라도 교사의 도움이 주어지는 데다가 자신의 능력 안에서 역할을 수행할 수 있기 때문에 프로젝트형수업을 실시할 수 있다는 장점이 있다. This paper aims to propose teaching plans for advanced Korean learners by applying a project work. The project type teaching method is well known as being learner-centered. However, the Korean proficiency of learners must be good enough to perform the project, otherwise it is not easy to get a desirable educational effect. Accordingly, in this paper, in order to enhance the applicability of project type teaching method in Korean education, controlled project type which is somewhat controlled by a teacher is applied for the lesson for the theme of “Conservation of Water Resources”. The project type teaching method consists of the following four stages: stage of planning and preparation, stage of performance, and stage of presentation and evaluation. In this paper especially, the stage of performance is composed by applying currere, which is based on learner`s personal experiences. The method of currere consists of the following progress: regression, progression, analysis, and synthesis. It is also known as a teaching method which links knowledge` to ``real life``. For this reason, the currere has been applied for the subjects such as environment and ethics, which need actual fulfillment. Teaching plans which are set up by combining the project type and currere could be learner-centered, and could be applied to learners who have lower proficiency of the target language.