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접착재의 종류에 따른 In-Ceram 도재관의 변연적합도와 파절강도에 관한 연구
임주환,Lim, Ju-Hwan 대한치과보철학회 1998 대한치과보철학회지 Vol.36 No.6
In-Ceram system is one of contemporary esthetic all ceramic restorations and has relatively high flexural strength. The purpose of this study was to evaluate the marginal fidelity according to type of resin cement and measuring position, and to evaluate fracture strength according to type of resin cement. In this study, twenty seven In-Ceram crowns were fabricated on the metal master die of prepared maxillary right central incisor and devided into three groups. All specimens were cemented with Panavia 21 (group PV), Super-bond (group SB) and Lute-it (group LI) on the metal master die. After cementation, specimens were measured marginal gap between the margin of the In-Ceram crown and the finishing line of metal master die by using a stereomicroscope (SZ-ST, Olympus, Japan). Marginal gaps were recorded at the labial, lingual, mesial and distal measuring points on the metal master die. For the mesurement of fracture strength, lingual surfaces of cemented specimens were loaded at a distance of 1mm from incisal edge by using the Autograph S-2000 (Shimadzu, Japan). The results of marginal fidelity and fracture strength were statistically analyzed with the SPSS version 8.0 programs. The results of this study were as follows: 1. In comparison of marginal fidelity according to the measuring points, there was no significant difference. 2. The marginal fidelity according to the type of resin cement was decreased in order of group $LI\;(63.75{\mu}m),\;SB\;(77.78{\mu}m),\;PV\;(86.53{\mu}m)$, and there was significant difference between group LI and PV (p<0.05). 3. The fracture strength according to the type of resin cement was showed descending order of group $LI\;(60.00kg/cm^2),\;SB\;(56.80kg/cm^2),\;PV\;(56.11kg/m^2)$, but there was no significant difference.
가철성 다이를 가진 작업모형에서 다우엘 핀의 종류에 따른 정확도에 관한 연구
임주환,Lim, Ju-Hwan 대한치과보철학회 1997 대한치과보철학회지 Vol.35 No.2
In this study, 4 types of dowel pin were used to fabricate removable dies using the Pindex system. The comparison of interabutment distances between before and after sawing were conducted in each type of dowel pin, and the horizontal discrepancies in the interabutment distance according to the abutment location and the type of dowel pin were comparatively analyzed. Abutments LM(left molar), LP(left premolar), A(anterior), RP(right premolar), and RM (right molar) were used for measurement. The interabutment distances were measured between each abutment : LM-LP, LM-A, LM-RP, and LM-RM. The slide scanned image of each model was magnified on the computer screen and the measurements were conducted using the meeting point of the cross on the occlusal surface of each abutment. The results were as follows : 1. In the comparison of interabutment distances between before and after sawing in each type of dowel pin, there was no significant difference in World dowel pin(double), Bi-pin(double), Maxcel dowel pin(single). In the World dowel pin(single) there was no significant difference between LM-LPs, but in the other measurements (LM-As, LM-RPs, and LM-RMs) there was significant difference between before and after sawing(p<0.05). 2. In comparison of horizontal discrepancies of the measurement according to the abutment location, there was significant difference between measurement LM-LP($0.27{\pm}0.19mm$) and the others : LM-A($0.46{\pm}0.20mm$), LM-RP($0.38{\pm}0.25mm$), LM-RM($0.45{\pm}0.22mm$) (p<0.05). 3. In comparison of horizontal discrepancies of the measurement according to the type of dowel, there was no significant difference between each dowel. As a result when fabricating a removable die using the previously mentioned 4 types of dowel pins, it is thought that the horizontal discrepancy increased in proportion to the interabutment span length and does not depend on the type of dowel pin.
폴리술폰 중공사막을 이용한 Flaring Gas에서의 이산화탄소 분리 및 전산모사
임주환,이충섭,김학은,배명원,모용기,하성용,Lim, Joo Hwan,Lee, Chung Seop,Kim, Hack Eun,Bae, Myong Won,Mo, Yong Gi,Ha, Seong Yong 한국막학회 2015 멤브레인 Vol.25 No.2
Flaring gas에서 $CO_2$ 제거를 위해 폴리술폰 고분자를 이용한 중공사막을 제조하였다. 제조된 중공사막은 1단과 2단 공정의 전산모사와 실제 공정을 통해서 $CH_4$ 농도 99% 이상 $CO_2$ 농도 1% 미만의 운전조건과 성능을 확인하였다. 또한 $25Nm^3/h$ 급 bench scale $CO_2$ 분리막 연속공정에서 100시간의 운전시간 동안 $CO_2$의 농도를 1% 미만으로 안정적으로 운전하였고 이때의 $CH_4$ 회수율은 약 98%였다. Polysulfone (PSF) hollow fiber membrane was prepared to separate $CO_2$ from the flaring gas. Fabricated PSF membrane system was fulfilled under 1 stage, 2 stage membrane process and simulation in order to confirm the operating condition for 99% of $CH_4$ and 1% of $CO_2$ concentration. Also, $25Nm^3/h$ bench scale $CO_2$ separation membrane system was operated under 1% of $CO_2$ concentration during 100 hr, and $CH_4$ recovery ratio was 98%.
임주환(Ju Hwan Lim),이희찬(Hee Chan Lee),김지성(Ji Sung Kim),김규호(Kyu Ho Kim),한상필(Sang Feel Han) 위기관리 이론과 실천 2015 Crisisonomy Vol.11 No.4
본 연구는 하천 및 홍수터 등 공간 복원 시 발생할 것으로 기대되는 하천의 기능과 각 기능의 하위요인을 도출하고, 해당 기능과 하위요인간의 상대적 중요도 및 우선순위를 하천 유형별로 파악하는 것을 목적으로 수행하였다. 접근방법으로 Delphi 기법과 계층적 의사결정방법(AHP)을 적용하였다. 분석을 위한 자료 수집을 위해 하천 전문가를 대상으로 2회의 설문조사를 실시하였다. 분석결과 하천 유형별 중요기능과 요인이 다른 것으로 나타났으며, 농지 및 산지하천의 경우 생태기능이, 도심하천의 경우 수질정화 및 친수기능이 상대적으로 중요한 것으로 분석되었다. 연구의 결과는 하천복원 사업을 진행함에 있어 효율적인 정책대안과 합리적인 방향성을 제시할 수 있는 유용한 근거자료가 되고, 하천공간 기능에 대한 후속연구의 참고자료로서 활용 가능하다. The objective of this study is to analyze priority and important factors of river functions expected to generate in terms of spatial, mainly in the river and floodplain, restoration. In order to meet the goal, this study examined factors represented in previous reference literatures. This study used Delphi technique and AHP. The expert survey was conducted twice to collect data for the analysis. The results show that important functions and factors are different with each land-use type around river. The ecological function of river is more important in rural areas. Otherwise, the water purification and waterfront function is more important in river across urban areas. The results could be a useful basis for policy alternative and direction in the river restoration and utilize reference of a follow-up study about the river spatial restoration.