A review on clogging mechanisms and managements in aquifer storage and recovery (ASR) applications

정훈영,전성천,Jeong-Yong Cheon,박민지 한국지질과학협의회 2018 Geosciences Journal Vol.22 No.4

Clogging, the major obstacle in aquifer storage and recovery (ASR) applications, causes declines in recharge rates and ultimately the failure of artificial recharge systems. Clogging is generally triggered by physical processes, which involve the accumulation of suspended solids from recharge water, the release of fine particles from soils and aquifers and their migration, and the formation of gas barriers from the entrapped air in recharge water and biogenic gases. Physical clogging is then followed by biological processes (e.g., the growth of microorganisms and the accumulation of biomass). It can be further aggravated by chemical reactions leading to mineral precipitation. Prior to artificial recharge, source water can be pretreated via sedimentation, coagulation, filtration, advanced oxidation, and disinfection to lessen the clogging potential. Although such preventive measures are useful, clogging will eventually occur in recharge systems, thus necessitating the rehabilitation. The rehabilitation methods include backwashing, scrubbing, surging, jetting, under-reaming, acidification, and biociding. Notably, the methods applied vary with the type of recharge systems: surface infiltration systems, vadose zone infiltration systems, and aquifer injection wells. Among them, surface infiltration systems are most cost-effective and easiest to install and maintain. Even if field conditions are not adequate for their implementation, surface infiltration systems can be used in conjunction with the other recharge systems.

Micellar solubilization of multi-component non-aqueous phase liquids (NAPLs) by Tween 80

정훈영 한국지질과학협의회 2012 Geosciences Journal Vol.16 No.3

Non-aqueous phase liquids (NAPLs) at contaminated sites often consist of multiple organic pollutants. In this study, the solubilization behavior of multi-component NAPLs was examined for the ternary mixtures of TCEPCEoctane, PCEo-xyleneoctane, and hexaneoctanedecane in Tween 80 solutions. In the TCEPCEoctane mixtures, the most hydrophobic octane exhibited the enhanced solubilization compared with that predicted by the ideal behavior, but the least hydrophobic TCE showed the decreased solubilization. In reference to the ideal solubilization, PCE, the intermediate hydrophobic component in the mixtures, was less solubilized in an octane-rich region but more solubilized in a TCE-rich region. Similarly, in the PCEo-xyleneoctane mixtures, the relatively hydrophobic octane was preferentially solubilized, whereas the less hydrophobic PCE and o-xylene were outcompeted. The mutual effect on the solubilization between PCE and o-xylene was not significant due to the small difference in their hydrophobicity. Compared with the preceding NAPL mixtures, the hexaneoctanedecane mixtures showed the lesser extent of the nonideal solubilization behavior, which might be attributed to the proximity in the hydrophobicity and molecular structure among these components. Thus, the nonideal solubilization behavior in NAPL mixtures was largely controlled by the relative hydrophobicity among NAPL components

미디어 광고와 마인드맵 활용 기반의 진로지도 프로그램이 자폐스펙트럼장애 학생의 어휘력과 직업흥미에 미치는 영향

정훈영,송승민 한국정서행동장애학회 2016 정서ㆍ행동장애연구 Vol.32 No.2

본 연구는 미디어 광고와 마인드맵을 활용한 교육과정 중심의 진로지도 프로그램이 ASD 학생의 직업관련 어휘력과 직업흥미에 미치는 효과를 알아보는 데 그 목적이 있다. 이를 위해 서울시 송파구 소재 H 특수학교 중학교, 고등학교, 전공과에 재학 중인 ASD 학생 13명을 대상으로 대상자간 중다기초선 설계로 연구를 실시하였다. 연구 결과는 첫째, 미디어 광고와 마인드맵 활용 기반의 진로지도 프로그램이 ASD 학생의 직업 관련 어휘력 향상에 효과가 있다. 둘째, 미디어 광고와 마인드맵 활용 기반의 진로지도 프로그램이 ASD 학생의 다양한 직업흥미를 갖는데 긍정적인 효과가 있다. 본 연구 결과를 통해 미디어 광고와 마인드맵을 활용한 교육과정 중심의 진로지도 프로그램이 ASD 학생의 직업관련 어휘력과 직업흥미를 높이는 데 효과가 있음이 증명되었다. The purpose of this study is to determine the effect of Curriculum-centered Career Guidance Program using Media Advertisement and Mind Map on vocational interest vocabulary and vocational interests of the students with ASD. The research was conducted, using multiple baseline across subjects design, on thirteen students with ASD who are currently attending H special-education school located in Songpa-Gu, Seoul. It concluded as follows. First, Career Guidance Program based on Media Advertisement and Mind Map has a positive effect on improving vocational interest vocabulary of the students with ASD. Second, Career Guidance Program based on Media Advertisement and Mind Map has a positive effect on the students with ASD to acquire diverse vocational interests. This study has shown that Curriculum-centered Career Guidance Program using Media Advertisement and Mind Map has the beneficial effect on improving vocational interest vocabulary and vocational interests of the students with ASD.

파워카드 전략이 자폐스펙트럼장애 학생의 사회적 행동 기술에 미치는 영향

정훈영 한국정서행동장애학회 2017 정서ㆍ행동장애연구 Vol.33 No.2

The purpose of this study is to investigate the effect of the power card strategy on the social behavior skills of ASD. For this purpose, the multiple prove baseline design across subjects was conducted on three of ASD middle school students who are attending special school in Songpa-Gu, Seoul. The social skills of society were established as greeting, eating habits, and arrangements. also we made power cards to reflect the special interests of each student such as Man of thunderbolt, EXO, and Yun Bong-Gil the Martyr. I measured ‘greeting’ during the time of going to school, ‘eating habits’ during lunch time, and ‘arrangement’ during the period of art. Several research studies show that there has been an increase in greeting, eating habits, and arrangements. and also the level of action has been maintained even after the mediation was stopped. The results of this study demonstrated that the power card strategy that reflects the special interests of ASD students has a positive influence on the improvement of ASD student’s social skills. 본 연구는 파워카드 전략이 자폐스펙트럼장애 학생의 사회적 행동 기술에 미치는 영향을 알아보는데 목적이 있다. 이를 위하여 서울특별시 송파구 소재 특수학교에 재학 중인 자폐스펙트럼장애 중학교 학생 3명을 대상으로 대상자간 중다 기초선 설계를 실시하였다. 연구 대상 학생들의 사회적 기술 행동은 인사하기, 식사예절 지키기, 정리하기로 설정하였고, 각각 학생들의 특별한 관심인 번개맨, EXO, 윤봉길을 영웅으로 하여 파워카드를 제작하였다. 인사하기는 등교 시간, 식사예절 지키기는 점심 시간, 정리하기는 미술 시간에 측정하였다. 연구 결과 인사하기, 식사예절 지키기, 정리하기 행동이 증가하였으며, 중재가 중단된 후에도 목표 행동 수준이 유지되었다. 본 연구의 연구결과를 통해 자폐스펙트럼장애의 특별한 관심을 반영한 파워카드 전략은 자폐스펙트럼장애의 사회적 행동 기술 향상에 긍정적인 영향이 있음이 증명되었다.

Education for All'을 대비한 특수교육 정책 변화에 대한 소고(小考)

정훈영 복지대학교 장애인능력개발원 2016 장애인고등교육연구 Vol.2 No.2

본 연구는 'Education for All'의 시대적 사조에 따른 특수교육의 변화 방향에 대해 모색해 보았다. 이를 위해 우선적으로 경계선 지능 학생, 다문화가정 장애 학생, 정서·행동장애 학생을 위한 특수교육의 변화에 대해 살펴보았는데, 그 결론은 다음과 같다. 첫째, 일반교육과 특수교육의 사각지대에 놓인 경계선 지능 학생을 위해서는 우선 이 학생들의 실태 조사 를 실시해야 한다. 그리도 두 번째로는 부모들의 인식 개선을 위해 시·도교육청이 중심이 되어 경계선 지능 학생 학부모 연수를 실시하되 특수교육전문기관인 특수교육지원센터에서 강사풀을 제공해야 할 것이다. 둘째, 다문화가정 장애 학생 교육 뿐만 아니라 학부모 교육도 원활하게 이루어 질 수 있도록 특수교육지 원센터가 거점학교 역할을 해야 하며, 특수교사 양성 체제 변화가 필요하다. 셋째, 정서·행동장애 학생을 위해서는 학계 합의에 의한 정서·행동장애 대한 법적 용어를 재정립하여 현 재 정서·행동장애로 인한 학업상의 문제에만 국한된 범위를 사회적 정서·행동의 문제로 확대해야 할 것이 다.

Preparation and characterization of granular FeS from its nanoparticulate precursor using a freeze and thaw method

정훈영,Nonso Gbemudu,최하정,김수경,진성욱,Yongli Gao,Kai Sun,Kim Ford Hayes 한국지질과학협의회 2020 Geosciences Journal Vol.24 No.6

Mackinawite (FeS), an effective reagent for treating inorganic and organic contaminants, is generally produced as nanoparticles. Since these nanoparticles tend to aggregate to decrease permeability in aquifers and even cause pore clogging, it is often necessary to modify them into such forms to be adequate for preamble reactive barrier (PRB) applications. To this end, this study aimed to produce granular FeS (GFS) from its nanoparticulate precursor using a freeze and thaw method, by which the nanoparticle suspensions were subjected to freezing and then thawing. According to X-ray diffraction, the crystallinity of the resultant GFS was not changed noticeably. By an environmental scanning electron microscope (ESEM), the size of the resultant GFS particles was affected by the type and concentration of electrolytes (e.g., Na2SO4, NaCl, and CaCl2). While the particle size generally increased in the order of Na2SO4 << NaCl ≈ CaCl2, it decreased with the electrolyte concentration. The ESEM images processed with the proposed approach here allowed us to determine the macroporosity of GFS. The GFS prepared using 100 mM Na2SO4 solution had the largest population of the pores with ~0.2 μm in diameter. By batch experiments, the As(III) sorption capacity of GFS at neutral to basic pH was comparable to that of the nanoparticulate precursor, suggesting the PRB applicability of GFS to remedy As(III)-contaminated groundwater under anoxic conditions.

Assessing Abiotic Reductive Dechlorination of cis-DCE by Reduced Fe Species Forming under Various Redox Conditions

정훈영,Karthik Anantharaman,Sung Pil Hyun,Kim F. Hayes 대한지질학회 2010 대한지질학회 학술대회 Vol.2010 No.

충청북도 영동군의 중심리 계층구조

정훈영 忠北大學校 師範大學 地理敎育科 1983 忠北地理 Vol.1 No.-

능동 클램프 전류원 하프 브릿지 기반 태양광 모듈 집적형 전력변환장치에 대한 연구

鄭訓泳(Hoon-Young Jung),朴正圭(Jeong-Kyu Park),池湧赫(Young-Hyok Ji),元忠淵(Chung-Yuen Won),李泰遠(Tae-Won Lee) 전력전자학회 2011 전력전자학회 논문지 Vol.16 No.2

아스퍼거장애 아동의 간접 화행 이해 특성에 관한 연구

정훈영 ( Hoon Yong Jung ),서경희 ( Gyeong Hee Seo ) 한국정서.행동장애아교육학회(구.한국정서학습장애아교육학회) 2012 정서ㆍ행동장애연구 Vol.28 No.1

본 연구는 아스퍼거장애 아동이 간접 화행을 이해하는데 어떤 특성을 보이는지 알아보는데 그 목적을 두었다. 연구 목적을 달성하기 위하여 연령과 언어성 지능이 비슷한 아스퍼거장애 아동 20명과 일반 아동 20명을 대상으로 간접 화행 이해력 검사를 실시하여 두 집단 간의 양적 차이 비교와 간접 화행 이해력 검사에서 나타난 아스퍼거장애 아동의 특성을 문답 방법으로 질적 분석을 실시하였다. 연구 결과는 다음과 같다. 첫째, 간접 화행 이해력 검사에서 아스퍼거장애 아동과 일반 아동 간의 이해력에는 평서문, 명령문, 청유문, 의문문 모두에서 유의한 차이가 나타났다. 둘째, 아스퍼거장애 아동은 간접 화행을 이해할 때 다음의 세 가지 특성을 보였다. 첫 번째로 맥락의 정보를 전혀 활용하지 못하고 문장의 겉 뜻 그대로 해석하는 경우, 두 번째로 맥락의 정보를 활용하였지만 완전히 통합하지 못하고 해석을 하는 경우, 세 번째로 맥락과 상관없이 자신의 경험을 투사하여 해석하는 경우이다. 아스퍼거장애 아동의 간접 화행 이해의 문제는 그들의 핵심 증상인 사회성 결핍, 의사소통의 질적인 결함 보다는 인지적 결손에서 기인되는 것이라 할 수 있다. The research focuses on understanding the reaction of children with asperger disorder to indirect speech acts. To successfully achieve this purpose, two groups(one group of 20 children with asperger disorder and the other group of 20 children without) were tested with their ability to understand indirect speech acts. Both quantitative and qualitative research were done to understand the characteristics that the children with the disorder have. Quantitative research was done based on the comparison of the test results between the two groups, while qualitative research was done using the catechetical method. The result of the research is as follows: First, the children with asperger disorder had significant difference from the children without in understanding indirect speech acts. The difference was obvious in declarative sentence, interrogative sentence, propositional sentence, and imperative sentence all. Second, the children with asperger disorder showed three cases in understanding indirect speech acts: they interpreted the given sentence in literal sense without any information from context, or they did it with not enough information from context that their understanding was not united, or they interpreted with their own experiences regardless of the context. The implications of this research are as follows: The three cases in which these children showed misunderstanding in indirect speech acts can be explained by deficit of theory of mind, weak central coherence, and executive function deficit in order. Their problem in understanding indirect speech acts was caused not by their primary symptom from the disorder such as defective communication or lack of sociality, but by their flawed cognition.