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이충현,정근채,Lee, Chung-Hyun,Jeong, Keun-Chae 한국건설관리학회 2012 한국건설관리학회 논문집 Vol.13 No.1
도심지 건설 프로젝트에서 적정한 기초공법을 선정하는 것은 매우 중요한 의사결정 중 하나이다. 그러나 아직도 적지 않은 프로젝트에서 단순히 과거의 경험이나 숙련된 기술자의 의견에 기초하여 기초공법을 선정하고 있다. 본 연구에서는 기초공법결정과정을 보다 선진화하기 위해 계층분석법(Analytic Hierarchy Process; AHP)과 선호도함수(Preference Function; PF)를 이용하여 적정 기초공법을 선정하는 의사결정지원시스템을 제안한다. 제안된 시스템에서 계층분석법은 평가기준 간의 상대적 중요도를 반영하기 위해, 또한 선호도함수는 의사결정자의 기초공법 적합도에 대한 선호도를 고려하기 위해 이용된다. 제안된 의사결정지원시스템을 기 수행된 프로젝트 사례에 적용해본 결과, 시스템이 도출한 기초공법과 전문가들이 현장에 대한 면밀한 검토 후 선정한 기초공법이 동일함을 알 수 있었다. 제안된 의사결정지원시스템은 건설현장에서 최적의 기초공법을 선정하기 위한 의사결정 시 매우 유용한 도구로 활용될 수 있을 것으로 기대된다. It is one of the most important decision making problems to select the adequate foundation practice for the downtown construction project. However the foundation practice has not been selected systematically yet by considering various construction field conditions in many projects. The foundation practice is often informally selected on the basis of only past experiences and skilled engineer's opinion. For making the selection process systematically, in this study, we propose a decision support system (DSS) for selecting foundation practices based on the Analytic Hierarchy Process (AHP) and the Preference Function (PF). In the proposed DSS, the AHP is used for making the selection process more reasonable and the PF is used for considering the decision maker's preference. To validate the proposed DSS, we apply the proposed DSS to the pre-performed construction projects. The application results show that the proposed DSS gives the same foundation practices with the implemented foundation practices that the skilled foundation engineers select after carefully analyzing construction field conditions. The proposed DSS can be used as a useful tool for making decisions to select the foundation practice in the construction fields.
탐침법으로 실패한 선천성 비루관 협착환자에서 이차적 수술방법에 따른 수술효과 비교
이충현,이정헌,양재욱.Chung-Hyun Lee. M.D.. Jeong-Heon Lee. M.D.. Jae-Wook Yang. M.D. 대한안과학회 2005 대한안과학회지 Vol.46 No.5
Purpose: Evaluate the surgical results and clinical value of monocanalicular stenting (Monaka?)(FCI Ophthalmics, Marshfield Hills, MA, U.S.A) and balloon catheter dacryoplasty (DCP) using PTCA balloon (Stormer?) for congenital nasolacrimal duct (NLD) obstruction in children. Methods: The authors performed monocanalicular stenting (Monaka?) and balloon catheter (Stormer?) DCP as a secondary treatment of 25 children (27 lacrimal systems) over 12 months of age who had undergone ineffective probing treatment. The patients were followed up over 3 months and the postoperative outcome was assessed by fluorescein dye test. Results: Nine of eleven children (nine of eleven lacrimal systems, 81.8%) and seven of nine children (seven of nine lacrimal systems, 77.7%) showed objective and subjective improvement, respectively. Conclusions: Monocanalicular stenting and balloon dacryoplasty are excellent secondary treatments for congenital nasolacrimal duct obstruction after initial probing and irrigation surgery have been failed. Balloon dacryoplasty is a new procedure in improve the life-quality and reduce the complications rather than monocanalicular stenting.
이충현,허준,Chung-Hyun Lee,Jun Her 대한안과학회 2005 대한안과학회지 Vol.46 No.11
Purpose: Although the treatment of choice for bullous keratopathy is typically penetrating keratoplasty (PKP), not all patients are suited for this treatment. Thus, we evaluated the clinical effects of phototherapeutic keratectomy (PTK) on pain relief and on the improvement of photophobia and visual acuity in patients suffering from bullous keratopathy. Methods: Twenty-three patients with bullous keratopathy who were awaiting PKP and suffering from ocular pain, photophobia, and cosmetic problems, were assessed. Twelve eyes were treated with PTK using the excimer laser (VISX STAR S3, Irvine, CA, U.S.A). Another 11 eyes were treated with eye drops or other conservative modalities. Statistically significant differences in pain relief, photophobia improvement, and cosmetic improvement between two groups were assessed by Fisher`s exact test. Results: Twelve eyes with bullous keratopathy underwent PTK. At post-operative 1 month, 83% of patients showed relief of pain, 75% of patients showed improvements in photophobia, and 58% of patients had increased visual acuity of one or more line. The overall satisfaction rate of PTK was 91%, but 67% of patients showed recurrence of corneal opacity and bullae formation at 6 months after the procedure. Conclusions: Phototherapeutic keratectomy (PTK) reduced pain and improved visual acuity slightly in patients with bullous keratopathy. This procedure could be considered a valuable alternative treatment modality while awaitng PKP.
LED램프의 광학적 플리커 PstLM 및 SVM에 대한 연구
이충현(Chung-Hyun Lee),최재영(Jae-Young Choi),한명관(Myeong-Gwan Han) 한국조명·전기설비학회 2021 한국조명·전기설비학회 학술대회논문집 Vol.2021 No.11
This paper provides basic data for flicker measurement. The flicker regulation for smart LED lighting is being proposed. Therefore, studies on the flicker are needed. And we measure PstLM and SVM of the smart LED lamp.