• 한국공작기계학회논문집
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• 제15권3호
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• pp.82-90
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• 2006

Recently the electrostatic 2-axis MEMS stages have been fabricated for the purpose of an application to PSD (Probe-based Storage Device). However, all of the components(platform, comb electrodes, springs, anchors, etc.) in those stages are placed in-plane so that they have low areal efficienceis, which is undesirable as data storage devices. In this paper, we present a novel structure of an electrostatic 2-axis MEMS stage that is characterized by having large area platform. for obtaining large area efficiency, the actuator part consisting of mainly comb electrodes and springs is placed right below the platform. The structure and operational principle of the MEMS stage are described, followed by a design procedure, structural and modal analyses using FEM(Finite Element Method). The areal efficiency of the MEMS stage was designed to be about 25%, which is very large compared with the conventional ones having a few percentage.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.531-532
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• 2006

This paper presents our implemented, synthesized and tested on demand and partial reconfiguration approaches for FIR filters using Xilinx Virtex FPGAs. Our scope is to implement a low-power, area-efficient autonomously reconfigurable digital signal processing architecture that is tailored for the realization of arbitrary response FIR filters on Xilinx Virtex4 FPGAs. The implementation of design addresses area efficiency and flexibility allowing dynamically inserting and/or removing the partial modules to implement the partial reconfigurable FIR filters with various taps. This partial reconfigurable FIR filter design shows the configuration time improvement, good area efficiency and flexibility by using the dynamic partial reconfiguration method.

• 대한원격탐사학회지
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• 제22권5호
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• pp.439-443
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• 2006

Image co-registration is the process of overlaying two images of the same scene. One of which is a reference image, while the other (sensed image) is geometrically transformed to the one. Numerous methods were developed for the automated image co-registration and it is known as a timeconsuming and/or computation-intensive procedure. In order to improve efficiency and effectiveness of the co-registration of satellite imagery, this paper proposes a pre-qualified area matching, which is composed of feature extraction with Laplacian filter and area matching algorithm using correlation coefficient. Moreover, to improve the accuracy of co-registration, the outliers in the initial matching point should be removed. For this, two outlier detection techniques of studentized residual and modified RANSAC algorithm are used in this study. Three pairs of Landsat images were used for performance test, and the results were compared and evaluated in terms of robustness and efficiency.

• 사물인터넷융복합논문지
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• 제7권3호
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• pp.9-14
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• 2021

본 논문에서는 주택이나 건물의 단열 진단을 통하여 에너지 손실 요인을 발견하고 이에 따른 에너지 효율 개선에 대한 방향을 제시하고 있다. 건축물의 에너지 효율 요소는 단열 진단, 열교 진단, 창호 진단, 기밀 진단, 설비 진단 등으로 구성된다. 에너지 복지 사각지대 주민 및 시설 중 전라남도 나주시에 위치한 한 경로당 건물을 대상으로 하여 에너지 효율 진단을 실시하고 단열 시공을 한 후의 에너지 효율 진단을 실시하였다. 에너지 측정과 진단 및 분석은 IoT 기반 통합 유무선 에너지 진단 플랫폼인 에너지 파인더를 이용하였다. 비교 결과 전체적으로 16.38%의 에너지 절감률을 달성하였다. 연간 단위 면적당 난방 에너지 소요량은 시공 전 333.51kWh에서 시공 후 277.35kWh로 감소되었고, 연간 단위 면적당 냉방 에너지 소요량은 시공 전 5.51kWh에서 시공 후 5.22kWh로 감소되었다. 연간 단위 면적당 1차 에너지 소요량은 시공 전 464.52kWh 였으나 시공 후 403.69kWh로 감소되었으며, 연간 에너지 사용 비용은 시공 전 3,063,307.14원이었으나 시공 후 2,641,072.49원으로 절감되었다. 단열 이외의 에너지 효율에 영향을 미치는 기준들에 대한 추가적인 개선 작업이 필요하다고 판단된다.

• 한국도서관정보학회지
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• 제41권4호
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• pp.35-50
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• 2010

본 연구는 대전 지역에 소재하고 있는 15개 공공도서관을 대상으로 DEA 모형을 사용하여 2008년도 공공도서관의 상대적 효율성을 분석하고 이어서 최근 3년간의 추세변화를 분석하였다. 투입요소로는 직원수, 면적, 장서수가 사용되었으며 산출요소로는 이용책수와 이용자수가 사용되었다. 연구결과, 기술효율성 값의 추세변화를 분석해 보면 3년간 지속적으로 효율성이 개선되었으며, 기술효율성의 개선은 순수 기술효율성과 규모 효율성 둘 다의 개선에 있었다.

• 치위생과학회지
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• 제7권4호
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• pp.225-233
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• 2007

본 연구는 임상치과위생사들의 직무수행 과정에서 느끼는 직무소진 및 대처행동을 파악하기 위하여 대구, 경북, 울산지역에 근무하는 치과위생사 322명을 대상으로 설문조사를 실시하여 다음과 같은 결론을 얻었다. 1. 전체 대상자들의 영역별 직무소진 평균은 정서적 소진 3.26, 냉소적 태도 2.63, 직업효능감 감소 2.58이었고, 전체 평균은 2.82이었다. 2. 영역별 대처행동 평균은 적극적 대처가 3.36, 소극적 대처 2.95이었고, 전체 평균은 3.19이었다. 3. 일반적인 특성과 직무소진의 차이는 연령과 교육수준이 낮을수록 직업효능감 감소와 소진계가 유의하게 높았고, 미혼인 경우 냉소적 태도, 직업효능감 감소, 소진계가 유의하게 높았으며, 내성적인 성격은 정서적 소진, 냉소적 태도, 소진계가 유의하게 높았다. 4. 근무환경과 직무소진의 차이는 근무경력이 낮고, 일반직에서 일반진료 담당이 직업효능감 감소가 유의하게 높았고, 연봉이 낮을수록 냉소적 태도, 직업효능감 감소, 소진계가 유의하게 높았다. 5. 일반적인 특성과 대처행동의 차이는 연령이 낮고, 미혼이 소극적 대처에서 유의하게 높았고, 종교가 있는 경우 적극적 대처와 대처계가 유의하게 높았다. 6. 근무환경과 대처행동의 차이는 근무기관이 의원급인 경우 소극적 대처와 대처계가 유의하게 높았고, 근무경력이 낮을수록 소극적 대처에서 유의하게 높았으며, 연봉이 낮을수록 적극적 대처는 유의하게 낮았고, 소극적 대처는 높았다. 7. 직무소진과 대처행동간의 관련성에서 소진계는 적극적 대처 및 대처계와 유의한 역상관을 보였고, 소극적 대처와는 유의한 순상관을 보였다. 8. 대처행동에 따른 영역별 소진 차이는 대처계는 A그룹(평균미만)이 B그룹(평균이상)보다 직업효능감 감소와 소진계가 유의하게 높았고, 적극적 대처는 A그룹이 B그룹보다 냉소적 태도, 직업효능감 감소, 소진계가 유의하게 높았으며, 소극적 대처는 B그룹이 A그룹보다 정서적 소진, 냉소적 태도, 소진계가 유의하게 높았다. 이상의 결과에서 치과위생사의 연령, 근무경력, 연봉이 낮을수록, 미혼자가 소진과 소극적 대처가 높았고, 종교가 있는 경우 적극적 대처가 높아 경력이 낮은 치과위생사들의 직무소진을 감소시키고 적극적 대처행동을 활용할 수 있도록 하는 방안이 요구된다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2010년도 춘계학술대회 논문집
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• pp.1567-1573
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• 2010

The purpose of this study is to develop spatial configuration and area calculation method of warehoue. This paper deals with warehouses with palletized cargo since recently pallets are widely used in many warehouses to enhance efficiency. We identify spatial configuration and characteristics of each area. To represent realistic situations, we analyze characteristics of logistics equipment as well as interview results with expert warehouse architects. Through these analysis we suggest guidelines on area calculation of warehouse.

• 디지털산업정보학회논문지
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• 제14권3호
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• pp.115-125
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• 2018

In order to examine the ways to improve the efficiency of R&D investment, this paper presents analysis on both quantitative and qualitative efficiency of R&D projects. As Korea's R&D investment has significantly increased in recent years, the efficiency of R&D investment has attracted attention. In this paper, a Data Envelopment Analysis(DEA) method is used to construct models for quantitative efficiency and qualitative efficiency analysis. Based on a cases of agricultural R&D projects of Korea, the efficiency of national R&D projects were analyzed and their quantitative and qualitative efficiencies are compared. As a result, statistically significant difference between quantitative and qualitative efficiency was found. Also, characteristics of Decision Making Units(DMUs) which can influence both quantitative and qualitative efficiency were identified. In particular, the stage of a R&D project has significant impact on R&D efficiency. This study suggests that in order to enhance R&D efficiency both quantitative and qualitative nature of outputs should be considered when measuring R&D efficiency.

• 보건행정학회지
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• 제33권3호
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• pp.355-362
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• 2023

Background: Financial efficiency in monetary units and operational efficiency in non-monetary units are separately classified and evaluated. This is done to prevent the duplication of monetary units and non-monetary units in inputs and outputs. In addition, analyses are conducted to determine the factors that affect each aspect of efficiency. To prevent duplication of monetary and non-monetary units in inputs and outputs, financial efficiency, consisting of monetary units, and operational efficiency, comprising non-monetary units, are separately classified and evaluated. Furthermore, an analysis is conducted to identify the factors that affect each aspect of efficiency. Methods: This study conducted a panel analysis of 34 regional public hospitals and influencing factors on efficiency for 5 years from 2015 to 2019. Financial efficiency and operational efficiency were calculated through data envelopment analysis. Moreover, multiple regression analysis was conducted to identify the factors that influence both financial efficiency and operational efficiency. Results: The factors that affect financial efficiency include the number of medical institutions within the treatment area and the ratio of patients receiving medical care. Additionally, operational efficiency is influenced by the type of medical institution, the number of medical institutions within the treatment area, and the number of nursing positions per 100 beds. Conclusion: In order for regional public hospitals to faithfully fulfill their functions and roles as regional base public hospitals, several measures are necessary. Firstly, continuous monitoring and reasonable support are required to ensure efficient operation and performance. Secondly, a financial support plan tailored to the characteristics of local medical centers is needed. Additionally, local medical centers should strive to enhance their own efficiency.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.1295-1296
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• 2007

A lot of researches about dye-sensitized solar cell (DSC) are recently being conducted. Because DSC has several advantages to pass the limits of silicon solar cells such as a low manufacturing expense, a simple manufacturing process and its transparency. But most researches on DSC are still conducted about the unit cell and laboratory-centered. That is, present researches on DSC are not practical. Therefore, researches about large area cells and modules have to be prerequisites for DSC to have the practicality. Characteristics of large area DSC are so different from those of small area DSC in aspect of fill factor and efficiency. In this study, we made an experiment on finding suitable size of DSC that has the most effective power according to the variation of active area. In detail, the experiment was conducted about the optimum ratio of length to width and we introduced the ratio of active area to non-active area to find the active area which has the best output. Because small DSC doesn‘t have the best output in comparison with total area of cell although the smaller DSC has the better efficiency. As a result, we achieved the optimum ratio of length to width of 8:3 and active area of $8cm^2$ as the optimum size for upscaling DSC.