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정환용 ( Hwan-yong Jeong ),김영규 ( Young-kyu Kim ),정정조 ( Cheong-jo Cheong ),정상철 ( Sang-chul Jung ),이경동 ( Gyeong-dong Lee ),라덕관 ( Deog-gwan Ra ) 한국환경기술학회 2007 한국환경기술학회지 Vol.8 No.4
탈황폐수처리 공정에서 발생되는 스케일의 생성 원인을 규명하고, 스케일 생성 억제제 및 생성 스케일의 용해제를 개발하여 탈황폐수 처리공정에 적용하였다. 탈황폐수 처리공정에서 생성되는 스케일의 주성분은 Si, Al, S성분이며, 그 외 Fe, Mg, Ca성분을 함유하고 있는 것으로 나타났다. 탈황폐수에 포함된 석탄회 성분과 석고, 석회석이 반응하여 스케일의 성장을 촉진시킨다. 탈황폐수 처리공정 제1 반응조의 경우 체류시간이 길어질수록, pH가 높아질수록 황산 제1철과 염소이온이 반응하여 침전물인 Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>을 발생시켜 스케일의 부착과 성장이 촉진되기 때문에 스케일 생성을 줄이기 위해서는 체류시간을 줄이고, pH를 2로 조절해야 한다. 스케일 생성 억제제 D가 스케일 생성 억제에 가장 효과가 있었으며, 적합한 주입량은 500mg/L로 나타났다. 스케일 용해제의 유효성분(KOH와 Sodium Gluconate) 각 20%에 첨가제 B 2%, 분산 및 침투제 A 0.5% 주입한 경우 스케일의 용해도가 가장 우수하였다. 현장에 스케일 생성 억제제를 주입한 결과 SS 및 COD의 제거효율이 우수하였으며 적합한 주입 농도는 400mg/L로 나타났다. The aim of this study is to examine closely the cause of scale production that is being created during the FGD(Flue Gas Desulfurization) wastewater treatment process. During the examination, the scale producing inhibitor and scale solvent could be developed and these products were used in FGD wastewater treatment process. The results are as following. The main elements of scale that had been formed in FGD wastewater treatment process, were known as Si, Al, S. Additionally, Fe, Mg, Ca were shown as miner components. The scale production was promoted by the reaction with coal, gypsum and limestone existed in FGD wastewater. With prolonging the water retention time of first reaction pond in FGD wastewater treatment process and increasing pH, the settler as Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> that is produced by reaction sulfites and chloride ion, promoted the scale production. Therefore, in order to reduce scale, a management was needed that shorter the water retention time and control the pH to 2. The most effective scale producing inhibitor was determined as D, and its optimal dosage was determined by 500mg/L. The superior scale solvent could be made up by adding admixture B 2%, breakup and permeation matter A 0.5% into effective component(KOH and sodium gluconate) 20%, respectively. From the results of using the scale producing inhibitor on-site, SS and COD removal efficiency was superior and the optimal concentration of inhibitor at that time was shown to be 400mg/L.
김현곤,김성재,한명훈,강용호,정환용,Kim, Hyun Kon,Kim, Sung Jae,Hahn, Myung Hoon,Kang, Yong Ho,Jung, Hwan Yong 대한관절경학회 1998 대한관절경학회지 Vol.2 No.1
Recently, a variety of arthroscopic techniques have been reported for the treatment of the displaced tibial eminence fracture. The purpose of this study was to describe details of arthroscopic technique using pull-out wire and to evaluate the results. Eleven patients with irreducible type II and type III tibial eminence fractures underwent the arthroscopic reduction and internal fixation using double strand pull-out wiring. The anterior cruciate ligament tibial drill guide was utilized for the reduction of fracture and passage of the guide pins. The tibial eminence fracture was firmly fixed with double strand 26-gauge pull-out wire(0.45mm diameter). Fracture union was achieved at 7.2 weeks (range, six to eight weeks) after operation. All cases were united at the last follow-up. Subjectively, nine patients had no pain and no restriction of daily activities. Two patients with combined injuries had limitation of knee motion(10 to 130 degrees, respectively) and one patient showed mild anterior laxity. Early rehabilitation was enabled without loss of reduction and breakage of pull-out wire. The arthroscopic reduction and internal fixation using pull-out wire showed good results including early rehabilitation, early fracture union, minimal morbidity, and no requirement of the second operation for hard ware removal.
지역개발사업의 효과분석에 관한 연구 : 전남지역의 주요사업을 중심으로
김영수,김종재,송인성,이정구,김영기,조재육,정학신,전태갑,정환용,이성웅 전남대학교 지역개발연구소 1982 지역개발연구 Vol.14 No.1
Korea unprecedently experienced a marvelous rapid rate of economic growth in aggregate in terms of numerical measure during the last two decades. Various kinds of development projects with diverse goals and objectives were executed over the space of whole country, having raised enormous domestic and foreign financial resources in the course of this process. So far, however, not only the evaluation but also the comprehensive approach on those projects implemented were not e m bodied. It's because of not only too much desire to carry out more and quickly but also lack of general recognition about the importance of evaluation. So, though extensive development projects were propelled desultorily and energetically, there were few efforts to evaluate their impact on development of national space order comprehensively or to analyse the effectiveness of goal achievement and execution procedure of each project. Now it is indispensable to evaluate and analyse the accurate effectiveness of the present and/or future development projects in order to assure reasonable allocation of limited resources, heighten efficiency of diverse investment projects in future, and meet fundamental problems of unbalance between social classes, economic sectors and regional space order, which came into existence inevitably, owing to products during the process of rapid aggregate economic growth. This study aimed to focus on subjects as follows keeping in mind the motive mentioned above. 1. Redefining the concepts of regional policy and regional development projects in the light of Korean reality. 2. Synthesiying, arranging and classifying the numerous regional development projects implemented within the regional sphere of Cheonnam province significantly in the conceptual framework modified. 3. Analysing comprehensively the development effect of several main projects selected among projects mentioned above. 4. Identifying the problems occurred during the performing process of such projects and verifying the applicability of the various evaluation techniques of investment projects in Korea. This study was performed by a group of ten researchers from various fields to secure the interdisciplinary approach to the effect of those projects. Real impact-analysis focussed mainly on income and empolyment and besides focussed on location effect, the change of settlement pattern, infra-structure, environments, and inhabitants' consciousness etc.. In case that qualification was impossible, scenario-writing method was used. Development effect of those projects so far identified can be summarized as following; First, the meaning of regional development is a quantitative and qualitative change of both structure and function of a spatial society concerned along with so me historical cohesion. The change of this kind can be achieved by the introduction of accumulative innovation based upon regional characteristics, human-orientedness, comprehensive accessibility to the solution of problems and linkages with outer world. Second, the ultimate goal or objectives of regional development are to induce a balanced spatial development to secure an average living standard for all people regardless of their abode. To achieve this goal, following measures are recommended: eradication of unbalanced regional distribution of personal income, creation and security of job opportunities, and taking action to vitalize the regional growth-potential to contribute to the national economic growth. Third, the major impact of the phase 1 project of Kwang-ju Regional Development can be summarized- as more than 10,957 million won income-increase effect and 7,600 job-increase effect. Besides, these projects implemented improved location factors of regional agriculture and fisheries. Fourth, the stage 1 project of the Yong San River Basin Development implemented from 1972 to 1979 brought an increase of income by about 853.65 billion Won and job increase effect was negligible except for 9.7 million temporary jobs.