경골 Pilon 골절 후 가동술(mobilization)과 복합운동 적용사례 : 증례 보고

안호정,전범수,박지환 대한정형도수치료학회 2006 대한정형도수물리치료학회지 Vol.12 No.1

Purpose: The purpose of this study was to evaluate the effects of mobilization application for the lower extremity after fibula Pilon fracture operation patient. Methods: The subjects was 62 years old male who was injury of Lt. fibula shaft Fx., 3 cuneiform & cuboid Fx., 2.3.4 metatarsal bone Fx.. We were compared to result of physical therapy between pre and post exercise for 2weeks. Results: The results of this study were summarized below; The mobilization application of the Lt. lower extremity was significantly differences of the ROM at pre and post therapy after 2 weeks, especially in knee flexion (40˚). The increased of accessary movement was evaluated to increased of the physiologic movement about the joints of the lower extremity. Conclusion: We consider that factors of therapy result were not only fracture types, operation and reduction methods for the fibula Pilon fracture but also the ability of physical therapist's manual techniques.

고감도 Ames test(microsuspension assay)와 임파구 소핵시험법을 이용한 변이원성에 관한 조사 연구

안지영,김해준,윤인재,성영자,김영환,장영철 大韓産業醫學會 1996 대한직업환경의학회지 Vol.8 No.3

In order to evaluate the mutagenic effects of extractable indoor air pollutants (organic matters), we measured the mutagenic activities by sensitive microsuspension Ames test using new tester strains (YG 1024 and YG 1029). And additionally to evaluate the mutagenic effects on vital cell, we examined the frequencies of micronucleus appearing in lymphocytes from dye handling workers and controls. This study was conducted from Jan. to May, 1995. The extractable indoor air pollutants were collected by low volume air sampler in a general office room and 3 of dye handling factories. And the environment of general office room divided into 3 different groups according to the type of room heaters. To determine the frequencies of micronucleus appearing in lymphocytes, we sampled peripheral venous blood from 20 of dye handling workers and 20 of controls, and cultured, and then examined the lymphocytes. The results obtained were as follows: 1. The indirect mutagenic activities of extractable organic matters from suspended particulates collected in a general office room were higher than the direct one. 2. The strain YG 1024 was the most sensitive, and the increasing order of test strains that showed higher number of revertant were YG 1024, YG 1029, TA 100, TA 98. 3. In the general office room, the room using kerosene heater showed the highest mutagenecity, and the next was buthan gas heater, and non-heating room in order. 4. The mutagenic effects of suspended particulates in dye handling factories on the strain YG 1024 was 1.2 times higher than YG 1029. 5. The frequencies of micronucleus appearing in lymphocyte of the circulating blood of dye handling workers and the control were 5.65±2.97‰ and 4.65±0.97‰, respectively. And the difference was statistically significant.

Influence of Final Crystal with Synthesis of Basic Calcium Carbonate by Carbonation Process

Ahn, Ji Whan,Joo, Sung Min,Kim, Hyung Seok,Kim, Dae Hun,Kim, Jong Pyo,Kim, Hwan Trans Tech Publications, Ltd. 2003 Materials science forum Vol.439 No.-

Cubic형과 Colloid형 탄산칼슘 합성에서의 입경제어 연구

Ahn, Ji-Whan,Park, Chan-Hoon 한국자원리싸이클링학회 1996 資源 리싸이클링 Vol.5 No.3

탄산칼슘과 고분자 재료가 배합되면 서로의 계면에 대한 친화성이 결여되어 분산성이 저하하기 때문에 이를 위해 탄산칼슘을 표면처리를 하지만 이는 분체자신의 표면에너지를 저하시키는 역효과의 가능성도 있다. 따라서 표면처리를 하지 않아도 미세한 1차 입자의 상태로 유지하는 초미립체(입경 0.02~0.09$mu extrm{m}$) 입자의 콜로이드형 탄산칼슘 합성에 대한 기술이 절실히 요구되나 합성시 목적입도가 평균입도 범주에 속하고 또 그 분포가 좁아야 함이 핵심요소기술이 되는데 입경제어에 대한 인자 규명 및 최적 조건의 항구적인 합성조건에 대한 연구가 전혀 수행되지 못한 형편이다. 이에 본 연구에서는 수산화칼슘 현탁액에 탄산가스를 접촉시키는 기-액접촉방식의 CMSMPR(Continuous Mixed Suspension Mixed Product Removal)법을 이용하여 콜로이드형 탄산칼슘 합성을 목적으로 입방형 탄산칼슘과 함께 제어함으로 두 종류의 침강성 탄산캄슘을 최적 합성화 할 수 있었다. 수산화칼슘 현탁액 제조는$ 1100^{\circ}C$에서 수산화칼슘을 2시간 소성을 시켜 제조한 산화칼슘을 증류수에 600rpm으로 30분간 수화시킨 반응현탁액 2ι를 반응온도 $15^{\circ}C$와 반응교반속도 600rpm, 탄산가스 주입속도 1ι/min으로 모든 조건을 고정시키고 현탁액에 대한 산화칼슘의 농도변화만으로 입방형(0.2~0.9$\mu\textrm{m}$)과 콜로이드형($0.02~0.09\mu\textrm{m}$)을 합성하였고 이에 대한 반응현탁액의 농도 최적조건이 각각 5wt%와 2.5wt%임을 확인하였다. 결국 입경제어의 주요 인자가 현탁액의 농도임을 알았고 합성한 탄산칼슘은 Zeta sizer를 통해 측정하여 평균입도가 입방형은 223.4nm(0.223$\mu\textrm{m}$)와 콜로이드형 93.6nm(0.093$\mu\textrm{m}$)임을 확인하여 $H_2O$ 반응계에서 안정적인 균일입도제어를 할 수 있었다. Colloidal calcium wrbonate(diametcr 0.02-0 09 m~wja s developed to maintain the mamenl of pnriide formatio~>w ~lhoutsurlace trealment. The control factors of particle size and optimum condiliuna for compound fam*tition has not bccn studiedyet. This shldy war aimed at developing a method fur compounding colloidal calcium carbonfcte to cnl~hol cubic calciumcarbonate, and then compounding the b-o types oI precipitated calcium wrbonatc under optimum wndilrans Calc~umhydroxide was calcinated at 1, lWC far two hours, md then hydrated for 30 minutes at t i i O rprn and ambiznt temperahlle.Two-liter suspension was subjected to the contact with carbon dioxide at l5"C, 600 ipxn and C0= injection in the rate of 1 Umin Two types of dcium carbonate(cuhic calcium carbonatc(0 24.9 pm) md collnidd calcium mhnnate (0.02-0 09 pm))were compounded by "wing the concentrations of calcium oxide and ihe suspension were compounded. It was found that theoptimum concentrations of each suspensions were 5 wt % and 2.5 \I*.% respectively. ' h c key control factor af thc parlicle slzcdislribution was the concenkation al the suspension. The size of compounded particles was measured by a Zcla S k r 'fieaverage particle size of the cubic calcium carbonate aas 223.4 nm(0.223 pm), and that of thc colloidal a~lciumc arbonate was93.6 nm (0.093 km). Ihe particle sizc was evenly cantlolled on a stdblc basis in an H, O reaction system.asis in an H, O reaction system.

Catalysis Reaction Engineering, Industrial Chemistry : Synthesis of Single Phase Aragonite Precipitated Calcium Carbonate in Ca(OH)2-Na2CO3-NaOH Reaction System

( Ji Whan Ahn ),( Jeong Hwan Kim ),( Hyun Seo Park ),( Jung Ah Kim ),( Choon Han ),( Hwan Kim ) 한국화학공학회 2005 Korean Journal of Chemical Engineering Vol.22 No.6

Effect of Carbonation in Removal of Chloride from Municipal Solid Waste Incineration Bottom Ash

Ahn, Ji-Whan,Um, Nam-Il,Han, Gi-Chun,You, Kwang-Suk,Cho, Hee-Chan 한국암반공학회 2006 Geosystem engineering Vol.9 No.4

Most of chloride in municipal solid waste incineration bottom ash are easily soluble in water. As a reason of that, bottom ash limited its use as a road materials and cement contrete as well as landfill. Thus, the characteristic of chloride in bottom ash was investigated, though the distribution of chloride from based on particle size, characteristic of friedel's salt($3CaO$ $Al_2O_3$ $CaCl_2$ $10H_2O$) in bottom ash and the removal of friedel's salt via carbonation process. As a result, the content of chloride was increased with the smaller particle size, especially friedel's salt too. The soluble chloride like KCl, NaCl in bottom ash was possible to be removed by washing process, reversely friedel's salt (insoluble) was difficult. But friedel's salt could be removed via carbonation process because that has difficulties of preventing progressive carbonation and in controlling the activity of $CO_2$.

Preparation of Single-Phase Aragonite Precipitated Calcium Carbonate Used as an Inorganic Eco-Material

Ahn, Ji Whan,Park, Hyun Seo,Kim, Jeong Hwan,Cheong, Sun Hee,Kim, Jeong Ah Trans Tech Publications, Ltd. 2006 Materials science forum Vol.510 No.-

<P>In this study, single phase aragonite PCC was synthesized by the solution process using Ca(OH)2 slurry and Na2CO3 solution as the main reactants. To begin with, the formation behavior of PCC polymorphs following changes in supersaturation was investigated, and the optimum synthetic condition of single-phase aragonite PCC was clarified after the role of NaOH in the reaction system was reviewed. In the results, it was considered that lower supersaturation was necessary to obtain a single phase aragonite; and, since the solubility of Ca(OH)2 was decreased with the addition of NaOH by a common ion effect, it is possible to perform a experiment at a lower Ca2+ concentration. In conclusion, in the case of the reaction of the 2.5M NaOH solution, single phase aragonite was obtained. Furthermore, NaOH solution was produced as a by-product in the solution process by reacting Ca(OH)2 slurry with Na2CO3. Thus, recycling of the NaOH solution was attempted in order to clear the environmental issue. It is difficult to recycle directly since the NaOH solution was diluted during the experiment. The optimum condition was investigated by control of experimental factors such as the concentration of Ca(OH)2, Na2CO3 and NaOH, and the reaction temperature, after which the NaOH solution was recycled without re-treatment. The formation characteristics of aragonite PCC, such as formation yield, particle morphology and aspect ratio, were investigated.</P>

Characteristic of Carbonation Reaction from Municipal Solid Waste Incinerator Bottom Ash as a Function of Water Content and their Effect on the Stabilization of Copper and Lead

Ahn, Ji Whan,Cho, Hee Chan,You, Kwang Suk,Han, Gi Chun,Um, Nam Il Scientific.Net 2007 Materials Science Forum Vol.544-545 No.-

<P>Most carbonation processes utilizing municipal solid waste incineration bottom ash characteristically involve a high water content (over 100%). In this work, we developed an improved carbonation process, utilizing various water contents. In addition, we investigated the characteristics of a carbonation reaction using municipal solid waste incinerator bottom ash as a function of water content and their effects on the stabilization of copper and lead. As a result of such a carbonation reaction, the effect on the stabilization of heavy metals can be obtained. Due to this, the leaching concentrations of these were reduced. In a high water content, calcium aluminum compounds via carbonation reaction adsorbed Cu and Pb ions. Where a low water content (especially 30%) is present, particle surfaces are surrounded by calcium aluminum compounds of bottom ash as a result of the carbonation process. The leaching concentration of Cu and Pb were decreased through the carbonation process.</P>

Advanced Process for Recovery of High Quality Recycled Aggregate from Waste Concrete

Ahn, Ji-Whan,You, Kwang-Suk,Han, Gi-Chun,Um, Nam-Il,Cho, Hee-Chan 한국암반공학회 2006 Geosystem engineering Vol.9 No.2

Preheating and grinding method was examined as a way for recovery of high quality recycled aggregates from waste concrete. As results, as the preheating temperature increased, the removal rate of cement mortar from waste concrete increased. And when it was treated over $400^{\circ}C$ of preheating temperature, the absorption was reduced and cement mortar was effectively separated from waste concrete. It could meet the Korean Standards on aggregates for concrete. It means that recycled aggregates treated by preheating and grinding method can be expected to be used as the utilization which is same to natural aggregates.

Clinkering of Sewage Sludge Ash as Cement Raw Material

Ahn, Ji-Whan,You, Kwang-Suk,Cheon, Sung-Min,Han, Ki-Suk,Kim, Hwan The Korean Ceramic Society 2004 한국세라믹학회지 Vol.41 No.4

본 연구는 석회석, 셰일, 전로슬래그, 플라이 애쉬를 사용한 혼합원료에 대해 보통 포틀랜드 시멘트 원료로서 하수슬러지 소각재의 사용에 대해 조사하였다. 이와 관련하여 원료 중 셰일에 대한 하수슬러지의 적정 치환 비율을 확인하였으며, 1,300, 1,350, 1,400, 1,450, 1,50$0^{\circ}C$에서 1시간 혼합원료를 소성하였다. 이후 공기중 급냉을 시행하였으며, XRD, SEM을 통하여 합성된 클링커의 특성을 평가하였다. 또한, 클링커의 미반응 산화칼슘을 측정하여 소성성에 대한 결과를 얻었다. This study has been carried out to use the municipal solid waste sewage sludge ash generated at sewage disposal field as the raw materials of Ordinary Portland Cement (OPC). Limestone, shale, converter slag, and fly ash were used as the main raw materials. After the raw materials were mixed, these were fired at 1,300, 1,350, 1,400, 1,450, and 1,500$^{\circ}C$ for 1 h and cooled rapidly in air. The properties of clinker synthesized were examined with XRD, SEM, and burnability index by polysius method.