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      • 석회 안정화 슬러지와 플라이 애쉬 혼합재의 매립지 복토재로의 이용타당성세 대한 연구

        김영관,조홍재 江原大學校 附設 環境硏究所 1996 環境硏究 Vol.13 No.-

        Feasibility of using the mixture of a lime-stabilized municipal wastewater sludge and the fly ash as a landfii cover matetial was studied. the mixnures were prepared by varying mixing ratios. and their geotechnical propertes were experimentally determined. The appropriate mixing ratio of lime : sludge : fly ash for stabilization. which was the ratio to hold the pH of sludge-fly ash mixture above 12.0 for at least 2 hours with containing the fly ash content as much as possible. was 5 : 15 : 80. Plasticity index(PI) of the mixture drastically decreased at a sludge content less than 60% Maximum dry density linearly increased with fly ash. In the direct shear test the sludges were found to have an internal friction angle of 30.2" and a cohesion of 0.3kg/㎤. The internal friction angle of the mixture was found to increase with increasing fly ash content. Results of the consolidation tests showed that addition of fly ash to the sludge decreased both compression index and the secodary consolidation coefifcient while it increased the consolidation coefficient. In permeability tests using a consolidometer. permeability of 1 X10^(-7)㎝/s.I which is required in U.S. EPA standard as a landfill liner. was attained indicating a possibility of using the tested mixture as a landfill cover material.

      • OCT 시스템을 위한 이중 광경로 지연기와 PZT 광경로 지연기에서의 편광모드분산 및 열요동 보상

        김영관,박성진,김용평 경희대학교 레이저공학연구소 2004 레이저공학 Vol.15 No.-

        In this study, a duplex scanning optical delay line is implemented and characterized for optical coherence tomography. The reference and sample arms in Michelson interferometer are simultaneously scanned by use of two identical piezoelectric transducers (PZT). It is obtained that scanning range, thermal drift, repeatability, and axial scanning velocity of duplex optical scanning delay line are distinctly superior to those of single scanning optical delay line.

      • KCI등재

        Simultaneous reduction and functionalization of graphene oxide by polyallylamine for nanocomposite formation

        김영관,민달희 한국탄소학회 2012 Carbon Letters Vol.13 No.1

        A novel strategy for the simultaneous reduction and functionalization of graphene oxide (GO)was developed using polyallylamine hydrochloride (PAAH) as a multi-functional agent. The G-O functionalization by PAAH was carried out under basic conditions to catalyze the epoxide ring opening reaction of G-O with abundant amine groups of PAAH. We found that G-O was not only functionalized with PAAH but also reduced under the reaction condition. Moreover, the synthesized PAAH-functionalized G-O sheets were soluble in water and applicable to the synthesis of nanocomposites with gold nanoparticles.

      • KCI등재

        아연제련잔사물인 Y-site cake 처리방법연구

        김영관,강탁 대한금속재료학회(대한금속학회) 1978 대한금속·재료학회지 Vol.16 No.5

        Fe와 SO₄가 주성분으로써 이것이 ammoniojarosite와 carphosiderite의 형태로 존재하는 아연제련공장의 잔사물인 Y-site cake로부터 산화철을 얻어 공업적 이용이 가능케 하는 방법을 연구하였다. 이 잔사물을 단순히 열분해 시키면 NH₃와 CO₃가 각각 420℃ 및 710℃에서 분리 제거되며 Fe₂O₃가 남는다. 처리온도를 낮추기 위해 Y-site를 Na₂CO₃와 혼합하여 가열하면 400℃에서 Fe₂O₃와 Na₂SO₄가 얻어진다. 또 한가지 다른 방법으로는 Na₂CO₃용액에서 Y-site를 분해하여 Fe(OH)₃로 만들며 Na₂SO₄용액을 얻는 것이다. 이때 Y-site의 분해속도는 온도에 따라 심하게 영향 받으며 온도가 높을수록 필요로 하는 Na₂CO₃량이 감소한다. 이 아연제련공장의 잔사물을 처리하는 가장 좋은 방법은 열에너지 문제를 고려할 때 Na₂CO₃용액에서 분해시키는 방법이다. For the utilization of the zinc plant residues composed chiefly of ammoniojarosite and carphosiderite, the separation methods of iron oxide from the residues are studied. By thermal decompositions of the residues, gaseous ammonia and SO₃ were separated at the temperatures of 420° and 710℃ respectively and the remaining solids were iron oxide. When the mixtures of the residues and anhydrous Na₂CO₃ were heated, NH₃ was eliminated at much lower temperature (80°) and the remainders became iron oxide and water soluble Na₂SO₄ at 400℃. In the solutions of Na₂CO₃, the jarosite group compounds of the residues were converted to iron (III) hydroxide with SO²₄^- in solution, The conversion rate was increased and the amount of Na₂CO₃ required was decreased by increasing temperature of the solution. Among the methods studied, the conversion of the zinc plant residues to iron hydroxide in the solutions of Na₂CO₃ was considered the most economical for the recovery of iron oxide from the residues because of its low treatment temperature.

      • KCI등재

        百濟復興運動의 盛勢와 唐軍의 對應

        金榮官 한국고대사학회 2004 韓國古代史硏究 Vol.35 No.-

        The restoration movement of the Baekje Dynasty was prosperous and powerful at that time. The movement could make the Baekje's Dynasty regain its sovereignty and effect on consideration of Tang's army withdrawal from the Baekje's land. The political environment of the eastern world also helped the movement succeed. Tang's army was too busy to go on Goguryo expeditions and fight against foreign countries of North and West. In July, 661 both Tang and Silla armies were dispatched for the Goguryo expedition. Even Tang's army at Sabi castle had to join the expedition after giving up suppressing the restoration movement of the Baekje Dynasty. The Baekje's army could regain most of its former territory as the result of the restoration movement. Moreover, Tang's army at Dogjin Command was isolated from others and only waited for Silla's support. The Baekje's army for the restoration movement went on surpassing La-Tang combined forces until the army itself was confronted with the internal conflict. There was a turning point of the situation between the Baekje and La - Dang combined forces as the result of the internal conflict. The former lost its power against the latter. secondly, both Tang and Silla could deal with the restoration movement properly after Tang decided to discontinue the Goguryo's expedition for a while. Tang could have a time preparing for sending a support to Ungjin Commaud. In summary, there were some reasons that the restoration movement of the Baekje's Dynasty could be successful However, the major reason that made the movement succeed was Tang's Goguryo expedition. It made Tang focus on the Goguryo expedition and fight against the countries of the border areas before oppressing the movement. Therefore, Tang only wanted to control the area of former Baekje Dynasty through Ungjin Command. Silla's army also was dispatched for the Goguryo expedition instead of oppressing the movement properly.

      • 모바일시스템을 위한 다중 체크포인트 플래시 파일시스템

        김영관,박현주 한밭대학교 정보통신전문대학원 2004 정보통신전문대학원 논문집 Vol.2 No.1

        플래시 메모리는 전력소모가 낮고 부피가 작으며 메모리처럼 빠른 접근 속도를 가지지만, 기록을 위해 미리 삭제하는 과정을 거쳐야 하며 그 횟수가 제한되는 단점이 있다. 본 논문에서는 다중-체크포인트 정보를 이용 하여 대용량의 플래시 파일시스템을 효율적으로 관리하기 위한 MJFFS를 제시한다. MJFFS는 JFFS의 로그 기반 파일시스템의 장점과 JFFS의 단점을 극복한 빠른 마운트와 오류회복 수행으로 모바일 기기에 적합할 것이다. The flash memory consumes low power, is a small size, and has a fast access time like the main memory. But the flash memory must erase for recording and the erase cycle is limited. This paper proposes a MIFFS to using a multi-checkpoint information to manage a mass flash filesystem efficiently. A MIFFS will be suitable ato a mobile device owing to accomplish fast mounting and error recovery using advantage of log foundation filesystem and overcoming defect of JFFS.

      • 메인 메모리 DBMS 데이터의 안정적 저장 기술 분석

        김영관,박현주 한밭대학교 정보통신전문대학원 2003 정보통신전문대학원 논문집 Vol.1 No.1

        반도체 메모리 기술의 발전은 메인 메모리 데이터베이스가 사용 될 수 있는 기반이 되었다. 메인 메모리데이터베이스는 디스크 기반 데이터베이스에 비해 빠른 접근 시간과 균일한 성능 특성을 가진다. 메인 메모리 데이터베이스는 메인 메모리에 최적화된 데이터베이스 구조를 설계하고 관리하는 기법에 따라 성능상의 차이가 발생한다. 본 논문에서는 상용 메인 메모리 데이터베이스에서 데이터를 안정적으로 저장하는 기술들에 대해 기술 한다. Development of semiconductor memory technology became a cornerstone that MMDB(main memory database) can be used MMDB has higher access time and more equable performance property than disk resident database. MMDBs have differences of performance according to design methods of MMDB structure. This paper describes technologies that store data stably in commercial MMDB.

      • SCOPUSKCI등재

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