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조영호,Jo, Yeong-Ho 한국정보통신집흥협회 1991 정보화사회 Vol.44 No.-
정보사회의 건설도 지역의 발전과 국토의 균형적 성장이라는 대전제에 맞추어 이루어져야 하며, "정보의 지방화"와 "지방의 정보화"가 동시에 이루어져야 한다.
조영호,최현준,김정원,윤석헌,Jo, Yeong-Ho,Choi, Hyun-Jun,Kim, Jung-Won,Yun, Seok-Heon 한국건축시공학회 2020 한국건축시공학회지 Vol.20 No.2
프로젝트 초기단계에서 적정공사비 산정은 필수적이다. 적정공사비 산출을 위해서는 개산견적은 중요한 요인이 된다. 하지만 국내의 개산견적 활용 현황은 건물 유형에 따른 단위면적당 공사비만 활용하는데 그치고 있어 그 정확도가 높지 않다. 이에 본 연구에서는 따른 골조 공사의 공통 내역항목 수량을 연면적에 의한 회귀식을 제시하여 골조 공사의 철근, 레미콘, 거푸집에 대하여 개산 수량을 산출하고자 하였다. 본 연구에서 제시한 회귀식의 정확성과 타당성을 검증하기 위해 기존에 사용된 개산 수량법과 본 연구에서 제시한 회귀식을 실 사례에 적용하여 비교분석을 실시하였다. 그 결과 기존 개산 수량 법은 실소요 수량에 비해 발생한 오차율이 -102 ~ 55%였으며, 이에 기존 개산수량 법은 AACE에서 제시한 개산견적 정확도 범위인 -50~100%에 초과되었으나, 본 연구에서 제시한 회귀식의 오차율은 -6.4 ~ 11.62%였다. 이는 AACE의 개산견적 정확도 범위뿐만 아니라 상세견적 단계에서도 사용할 수 있다고 볼 수 있다. 그러나 더 높은 기대효과를 기대하기 위해서는 향후 수량뿐만 아니라 단가에 대한 영향요인을 분석하여 적정 공사비를 산출하는 연구가 필요하다고 판단된다. It is important to estimate the optimal construction cost at the early stage of the project. In this regard, conceptual cost estimate is an important factor for estimate optimal construction cost. However, domestic conceptual cost estimate are only used as cost per unit area according to the building type, and it's accuracy is not high. Hence, the purpose of this study is to calculate the approximate quantity and cost for reinforcing bars, concrete, and formwork by presenting a regression formula based on the total floor area of the common work items in the frame work. In order to verify the accuracy and validity of the regression formula presented in this study, a comparative analysis was performed by applying the regression formula and the traditional approximate quantity take-off method to real cases. As a result, the estimated error rate of the traditional method was -102~+55%, and exceeded the estimated conceptual cost estimate accuracy range of -50~+100% suggested by AACE(American Association of Cost Engineering). On the other hand, the error rate of the regression formula method presented in this study was -6.4~+11.62%. This can be used not only for conceptual cost estimate range of accuracy, but also for detailed estimates. However, it is necessary to analyze the factors that affect the unit price as well as quantity in order to calculate the appropriate cost.
수평공진형 다결정실리콘 미소액추에이터의 설계, 제작 및 시험
조영호,Jo, Yeong-Ho 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.5
This paper presents the design, fabrication, and testing of polysilicon electrostatic microactuators that resonate in the direction parallel to the silicon susbstrates. A set of six different designs has been developed using a theoretical model and design formulae developed for the mocroactuators. Microactuator prototypes are fabricated from a 2.1 $\mu{m}$-thick LPCVD polysilicon film, using a 4-mask surface-micromachining process. The prototypes are tested under a d.c. bias voltage of 45V with an a.c. drive voltage amplitude of 20 v.Measured resorant frequencies are in the ranges of 40-60 kHz, showing a good agreement to their theoretical estimates within error bounds of .$\pm$.5%. Important issues inthe design and microfabrication of the microactuators are discussed, together with potential applicaitons of the key technology involved.
단일모터 및 구면좌표계를 이용한 2차원 운동 3D 스캐닝 장치
조영호(Yeong Ho Jo),김광훈(Gwang Hun Kim),김무경(Moo Kyung Kim),이상열(Sang Yul Lee) 대한기계학회 2024 大韓機械學會論文集A Vol.48 No.3
In this study, we developed a 3D scanner capable of controlling two degrees-of-freedom in spherical coordinates using only one motor and camera to reduce production costs. Additionally, the developed device managed to scan the undersides of objects that are difficult to scan with existing commercial products. The camera mounted on the 3D scanner captured 2D images at regular intervals during the motors 360° rotation. Subsequently, we performed viewpoint synthesis using the acquired 2D images to generate a 3D model of the scanned object. Finally, post-processing was applied to obtain the final 3D model. Precision was measured by comparing the final model with that constructed using a commercial scanner for evaluation. The developed 3D scanner demonstrated higher precision compared with that of commercial products in challenging scan areas, yielding models closer to the original object. The developed 3D scanner exhibited superior precision compared with the commercially available scanners, making it a cost-effective solution that can scan difficult-to-reach areas, particularly the undersides of objects. This study highlights the potential of the proposed approach for achieving accurate 3D scanning while minimizing production costs.
공공청사 개산견적 정확도 향상을 위한 공사비 영향요인 분석
조영호 ( Jo¸ Yeong-ho ),윤석헌 ( Yun¸ Seok-heon ) 한국건축시공학회 2021 한국건축시공학회지 Vol.21 No.5
A Conceptual cost estimate, which is computed in the preliminary step of a project, is important for decision-making by a contractor in terms of the project budget, economic feasibility and validity analysis, and alternative comparisons. Therefore, a high error rate of a prediction model for a conceptual cost estimate can lead to various problems including excessive project expenditures and a delayed break-even point. this study proposed optimal impact factors by configuring quantitative impact factors computable in a preliminary step in various cases(combinations of impact factors). subsequently, the accuracy of different cases was comparatively analyzed by using the cases as input values of a prediction model using regression analysis. when the optimal combination of impact factors proposed in this study and other combination of impact factors were applied to the prediction model, the regression analysis-based prediction model exhibited 0.2-4.7% improvements in accuracy, respectively. the optimal combination of impact factors proposed in this study improved the accuracy of the prediction model of a conceptual cost estimate by removing unnecessary impact factor.