• 소음진동
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• 제11권2호
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• pp.276-284
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• 2001

In apartment buildings, floor-impact sound has been regarded as the major source that causes complaints from residents. It is mainly due to the use of light-weight structures and the lack of researches in terms of floor-impact sound. The purposes of this study are analyzing the characteristics of vibration response and sound radiation of 12type void slabs in the improvements void slab by impedance method and finding the fittest improvements void slab on the 12type void slab. The main results of this study are summarized as below: (1) In the $\frac{1}{3}$ octave band level of sound radiation, $\frac{1}{3}$ octave band levels, measured from four-divided improvement void slab(No.8) and eight-divided improvement void slab(No.12), are 10~25 dB lower than that of standard void slab(No.1) in the 1250 Hz. Especially, eight-divided improvement void slab(No.12) is the best void slab in terms of radiation efficiency of sound level. (2) In the correlation relation of acceleration and sound radiation, standard void slab(No.1), four-divided improvement void slab(No.8), SK standard four-hole void slab(No.10), and eight-divided improvement void slab(No.12) are positive correlation relation.

• 교육녹색환경연구
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• 제10권1호
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• pp.42-52
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• 2011

The importance of education and training facilities and education facilities on the relationship between effective as demonstrated in many studies can be very big. In this study, the status of existing school facilities improvement project is done individually, based on the systematic integration of the improvement project was to evaluate the feasibility. Furthermore, it was based on looking for ways to effectively pursue. Training School Facilities Improvement Program to be competitive, the country continued to be pursued systematically and very large scale as a whole must be a great national project. So much to promote efficient business environment, quality of education for children with detractors of the national budget to ensure efficient and most importantly in terms of economic investment that can be. In this study, the proposed K-TEGS existing school facilities, such as the development of techniques for the assessment based on this effort to promote an efficient business should be done on a continuous basis.

• 반도체디스플레이기술학회지
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• 제13권2호
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• pp.29-35
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• 2014

In this study general solar cell production process was complemented, with research on improvement of solar cell efficiency through surface structure and thermal annealing process. Firstly, to form the pyramid structure, the saw damage removal (SDR) processed surface was undergone texturing process with reactive ion etching (RIE). Then, for the formation of smooth pyramid structure to facilitate uniform doping and electrode formation, the surface was etched with HND(HF : HNO3 : D.I. water=5 : 100 : 100) solution. Notably, due to uniform doping the leakage current decreased greatly. Also, for the enhancement and maintenance of minority carrier lifetime, antireflection coating thermal annealing was done. To maintain this increased lifetime, front electrode was formed through Au plating process without high temperature firing process. Through these changes in two processes, the leakage current effect could be decreased and furthermore, the conversion efficiency could be increased. Therefore, compared to the general solar cell with a conversion efficiency of 15.89%, production of high efficiency solar cell with a conversion efficiency of 17.24% was made possible.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.I
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• pp.3-10
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• 2005

The major display contenders: LCDs, CRTs, PDPs, projection displays, FEDs, SEDs and OLEDs are each examined in terms of the most critical display characteristic, the luminous efficiency. Each technology has great opportunity for improvement, but which one will win the race?

• 한국IT서비스학회:학술대회논문집
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• 한국IT서비스학회 2007년도 추계학술대회
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• pp.679-684
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• 2007

This paper proposes a scheme to estimate the technical efficiency of trucks in logistics as performance measure by Data Envelopment Analysis (DEA). The result of technical efficiency estimation shows that there exists a substantial opportunity for improvement in technical efficiency of trucks and also the heterogeneity in the technical efficiency among trucks.

• 한국항공운항학회지
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• 제31권2호
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• pp.81-88
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• 2023

SHM (Structural Health Monitoring) technique for monitoring aircraft structural health and damage, EHM (Engine Health Monitoring) for monitoring aircraft engine performance, and APM (Application Performance Management) is used for each function. APMS (Airplane Performance Monitoring System) is a program that comprehensively applies these techniques to identify the difference between the performance manual provided by the manufacturer and the actual fuel mileage of the aircraft and reflect it in the flight plan. The main purpose of using APMS is to understand the performance of each aircraft, to plan and execute flights in an optimal way, and consequently to reduce fuel consumption. First, it is to check the fuel efficiency trend of each aircraft, check the correlation between the maintenance work performed and the fuel mileage, find the cause of the fuel mileage increase/decrease, and take appropriate measures in response. Second, it is to find the cause of fuel mileage degradation in detail by checking the trends by engine performance and fuselage drag effect. Third, the APMS is to be used in making maintenance work decisions. Through APMS, aircraft with below average fuel mileage are identified, the cause of fuel mileage degradation is identified, and appropriate corrective actions are determined. Fourth, APMS data is used to analyze the economic analysis of equipment installation investment. The cost can be easily calculated as the equipment installation cost, but the benefit is fuel efficiency improvement, and the only way to check this is the manufacturer's theory. Therefore, verifying the effect after installation and verifying the economic analysis is to secure the appropriateness of the investment. Through this, proper investment in fuel efficiency improvement equipment will be made, and fuel efficiency will be improved.

• 대한토목학회논문집
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• 제38권6호
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• pp.895-906
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• 2018

우리나라의 어린이보호구역 개선사업은 어린이가 주로 활동하는 유치원, 초등학교 주변에서 많이 발생하고 있어 어린이 교통사고 예방책의 일환으로 추진하고 있다. 하지만 어린이보호구역내 안전시설물에 대한 필수 설치 시설물과 적정 설치 수준에 대한 연구가 부족한 바, 본 연구에서는 자료포락분석을 활용한 안전시설물 설치의 효율성을 상대적으로 평가하여 개선방안을 제시하였다. 화성시 관내 초등학교중 총 28개 어린이보호구역에 대한 시설물 현황과 사고현황 자료를 구축하였다. 기존 연구상에 효과가 입증된 주요 시설물 6개(고원식 교차로, 고원식 횡단보도, 방호울타리, 미끄럼방지시설, 과속방지턱, 단속카메라)만 투입요소로 하여 분석하였다. 분석결과 28개소 중 12개소만 효율성이 있는 것으로 나타났으며, 16개소는 효율성이 떨어지는 것으로 나타났다. 효율집단으로 구분된 어린이보호구역은 방호울타리, 미끄럼방지시설, 단속카메라 설치가 비효율집단으로 구분된 어린이보호구역보다 적게 설치한 것으로 나타났다. 방호울타리는 어린이보호구역 전체연장 중 47% 정도만 설치하여도 충분히 효율성이 있는 것으로 나타났으며, 미끄럼방지시설의 개소 수는 $km^2$당 8.7개 정도면 효율성이 있는 것으로 나타났다. 비교대상의 수가 28개소로 상대적 효율성 평가지표로 활용하는 데는 본 연구가 한계가 있으며, 향후 전국단위로 그룹화 하여 각 그룹별로 효율성 평가할 수 있을 것으로 판단된다.

• 한국병원경영학회지
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• 제13권3호
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• pp.69-93
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• 2008

Rising healthcare cost is a global phenomenon that justifies governments' introduction of 'incentive regulation' plan for the improvement of hospital efficiency. A number of previous studies tried to evaluate the efficiency of healthcare organization by using Data Envelopment Analysis(DEA), a common efficiency benchmarking method. However, there is a concern that this kind of efficiency evaluation could induce "quantity-quality trade-off". Moreover, as quality aspect is especially important in terms of 'effectiveness' of health care, it should be considered in efficiency evaluation of healthcare organization. A number of different models were tried so far to incorporate quality aspect into DEA, however, none is universally recognized as a standard. Thus, in this study, previous quality-incorporating DEA models were categorized into 6 types according to the way of incorporating quality aspect, and strengths and limitations of each type were reviewed with a set of artificial data as an example. Based on this review, a new quality-incorporating efficiency evaluation model, named Quality-adjusted output DEA(QAO-DEA), was suggested. As an exploratory empirical analysis, technical efficiency of human resource were measured with different quality-incorporating DEA models, using 2004 data from National University Hospitals. In conclusion, Quality-adjusted output DEA(QAO-DEA) model seems to be one of the most desirable alternatives to incorporate quality aspect in efficiency evaluation of hospital, and deserves the consideration as a policy tool to induce simultaneous improvement of both efficiency and quality.

• 한국컴퓨터정보학회논문지
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• 제12권1호
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• pp.205-217
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• 2007

본 연구에서는 일반은행의 경영효율성 변화에 대한 분석을 하였다. DEA를 통하여 은행별 효율성을 규명한 후, 상대적으로 효율적인 은행과 비효율적인 은행으로 구분하였다. 비효율적인 은행에 대해서는 비효율적인 부문 및 정도를 파악하고자 하였으며, 효율성 개선방안의 제시와 BCC모형으로 은행의 규모가 경영효율성에 미치는 영향도 분석되어졌다. 또한, 시중은행과 지방은행간 효율성에 차이가 나타나는 가를 검증하였다. 분석 결과 시중은행과 지방은행 모두 2000년 이후 지속적인 경영효율성 개선을 보여주고 있으며, 시중은행의 경영효율성이 2000년을 제외하고는 지방은행보다 높은 것으로 나타났다. 시중은행과 지방은행간 자기자본비율을 제외한 검정변수에 있어서는 차이가 존재하는 것으로 나타났으며, 경영효율성 차이에서는 별다른 차이가 없음을 보여주고 있다. 규모가 경영효율성에 미치는 영향에서는 구조조정과 합병에 의한 규모의 효과가 없거나 오히려 부의 영향을 미치는 것으로 나타나고 있다.

• 산업진흥연구
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• 제8권2호
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• pp.29-36
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• 2023

본 연구는 중소기업의 ESG 경영이 조직 생산성 향상에 미치는 영향에 관하여 2022년 10월 15부터 10월26일까지 설문 410개를 분석 결과를 요약하면 다음과 같다. 첫째, ESG 경영의 하위영역인 추진의 명확성, 내용의 타당성, 방법의 효율성, 직원의 우호성과 생산성 향상의 하위영역인 근로복지, 직무만족도, 조직 관리간의 직원 "우호성, 근속 태도"를 제외한 모든 영역에서 상관관계가 있으므로 ESG 경영의 하위 변인들을 적절히 조절함으로써 업무의 효율성을 극대화할 수 있다. 둘째, 상관 관계를 통해 조직에서 생산성 향상을 위한 우선순위 선정에 도움이 될 수 있으며. 인과 관계 분석은 추진의 명확성(β=.342)과 내용의 타당성(β=.276)이 가장 영향력을 미치는 것으로 나타났다. 셋째, ESG 경영에서. 추진의 명확성, 내용의 타당성, 방법의 효율성, 직원의 우호성과 조직관리 간의 상관 관계는 .719로 높은 상관관계를 보이며 인과 관계 분석은 방법의 효율성(β=.455), 직원의 우호성(β=.217)이 조직관리에 영향력을 미치는 것으로 나타났으며 이는 방법의 효율성(β=.455)을 높이기 위해 인사조직관리가 필요함을 알 수 있다. 본 연구는 중소기업의 ESG 경영과 생산성 향상의 관계에 있어서 ESG 경영성과의 인과 관계를 밝히는 데 연구의 의미가 있다.