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항진균제를 첨가한 수종의 점막 조정제가 Candida albicans 성장 억제에 미치는 효과
장대순,이근우,Chang Dae-Soon,Lee Keun-Woo 대한치과보철학회 1994 대한치과보철학회지 Vol.32 No.2
Tissue conditioners have been used for treatment of denture stomatitis caused by wearing of dentures. Early studies pointed out Candide albicans (C. albicans) as main etiologic factor, and antifugal agents were added for control of the species. But there is a little information about broad comparison on the effect of tissue conditioners and antifungal agents added. The purpose of the present study was to compare the inhibiting effect of four tissue conditioners and one temporary soft liner on the growth of C. albicans for treatment of denture stomatitis using gel diffusion method by measuring diameter of the zone of growth inhibition. Three antifungal agents were added to each material for evaluation of the effect of added agents. Finally, observation was made to evaluate the effect of the loss of antifungal elements by aging of the specimen. The results of this study were obtained as follows : 1. Tempo had remarkable antifungal effect showing the zone of growth inhibition as 2.35 mm at 1st day, and was most effective on End: 4th and 7th day from incubation (p<0.05). But Coecomfort, Dura conditioner, Visco-gel, Coe-soft had little antifungal effect from the 1st day of incubation. 2. Nystatin was most effective showing 9.60-12.04 mm of zone of inhibition at the 1st day from incubation. The antifungal properties were reduced to amphotericin B, chlorhexidine and materials without agent (p<0.05), and the effect was diminished by time. 3. As pretreatment with amphotericin B, nystatin, chlorhexidine, Tempo was very effective at the 1st day from incubation showing zone of inhibition as 3.65, 12.04, 4.78 mm with addition of each agent. Dura conditioner had strongest antifungal effect at the next day as 2.86, 5.33, 1.29 mm of zone of inhibition, and yielding results of Coe-comfort, Tempo, Coe-soft was shown at 4th and 7th day from incubation (p<0.05). Taken all together, tissue conditioners have little antifungal effect except Tempo. Formation of the zone of growth inhibition was due to agents amphotericin B, nystatin, chlorhexidine and nystatin was most effective. Conclusively, it is advisable to select material which is effective on the growth of C. albican and consider addition of antifungal agents for treatment of denture stomatitis.
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SOP(Sequence of OPeration)를 이용한 생산라인 레이아웃 설계를 위한 시뮬레이션 프레임워크
장대순(Dae Soon Chang),안의국(Euikoog Ahn),박상철(Sang C. Park) (사)한국CDE학회 2013 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2013 No.1
Presented in this paper is a framework for the deployment and validation of the production line simulation using SOP(Sequence of OPeration) which is collected by designer. The proposed framework generates simulation model of the production line using SOP, an output of production line and process time of the operations. The simulation model consists of five nodes: the source node, the sink node, the work node, the buffer node and the transport node. This framework consists of four major steps; 1) The information including SOP of the product is collected by designer, 2) We automatically generate simulation model using SOP, and validate the model, 3) We automatically generate simulation model which is reflected geometry data, 4) We validate simulation model and decide design of the production line after reflecting results of all steps. The proposed framework has been implemented and tested using TV production line.
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안의국(Euikoog Ahn),장대순(Dae Soon Chang),박상철(Sang C. Park) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.동계
In this paper we describe dispatching rules to improve on time delivery in semiconductor wafer FAB. This is accomplished by filtering method for global due date and local due date. First filtering factor is an attempt to optimize on time delivery from a global point of view. If queue lot is not satisfy global due date, the lot can be filtering and it gives high priority. Second filtering factor is an attempt to optimize the on time delivery from a local point of view. Second filtering factor focuses on waiting time of queue lot in current step. If waiting time of queue lot is more delay than wait TAT, the lot can be filtering and it gives high priority. For verify the performance, we developed a simulation model by modifying MIMAC6, and conducted simulation with SEEPLAN® developed by the VMS solutions. The simulation results demonstrate that the proposed dispatching rules such as achieves a better on time delivery than existing classical dispatching rules.
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측정 데이터 이용한 자동차 외판 미세굴곡 추적 사례 연구
정연찬(Yun Chan Chung),이상헌(Sang Heon Lee),장대순(Dae Soon Chang),박상철(Sang Chul Park) (사)한국CDE학회 2013 한국CDE학회 논문집 Vol.18 No.2
This paper proposes an approach to detect unintended deflections in an automotive outer panel. Conventionally, the detection of unintended deflections has been performed by experienced works, and it requires much amount of time and efforts. The motivation of this work is to reduce such efforts by providing an automated detection methodology. For the detection of unintended deflections, we make use of the measured data from an optical scanner which can be considered as a Z-map data. The proposed approach consists of four major steps; 1) measured data acquisition for an automotive outer panel, 2) identification of shape features, 3) removal of shape features, and 4) detection of unintended deflections via curvature analysis.
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