• Industrial Engineering and Management Systems
• /
• 제11권3호
• /
• pp.224-232
• /
• 2012

The paper proposes a non-parametric methodology, data envelopment analysis, for measuring efficiency and productivity in service delivery systems with capacity constraints. The methodology provides allocation approaches for studying behaviors of firm and customers in service delivery strategy. The experimental study is carried out to investigate allocation behaviors and conduct an objective tradeoff between efficiency approach and productivity approach. The experimental result indicates that the efficiency approach allocates resource via maximizing customer efficiency rather than firm productivity as in the productivity approach. Moreover, the experiment reveals that there exists an objective tradeoff between the efficiency approach and the productivity approach. These findings provide strategic options for allocation policy in service delivery systems.

• 디지털융복합연구
• /
• 제13권7호
• /
• pp.89-97
• /
• 2015

최근 융복합 IT기술을 도입하여 새로운 업무형태로 스마트워크가 떠오르고 있다. 우리나라에서도 여러 기업에서 스마트워크 도입을 적극적으로 검토하고 있다. 본 연구에서는 이론적 틀로서 '자원기반관점'(Resource-Based View)을 사용하여 서비스 산업에서 스마트워크 IT자원이 업무효율성과 기업성과에 미치는 영향 요인을 조사하였다. 본 연구는 스마트워크에 대한 기존 연구를 바탕으로 파악된 요인들 간의 영향관계를 실증적으로 분석함으로써 학문적인 기여를 하였을 뿐만 아니라, 스마트워크를 도입하려는 기업에서 전략적으로 활용할 수 있는 결과를 제시함으로써 실무적으로도 의미있는 결과를 제시하였다. 구조방정식모형검증결과 스마트워크 IT자원 중 IT인프라와 IT스킬이 개인 업무 효율성에 유의한 영향을 주고, 업무어플리케이션과 IT스킬이 연대협력업무 효율성에 유의한 영향을 주는 것으로 나타났다. 또한 개인 업무 효율성과 연대협력업무 효율성이 재무성과와 시장성과에 각각 유의한 영향을 줄 수 있다는 것을 확인할 수 있었다. 그러므로 서비스산업에서 스마트워크를 도입하여 실제업무에 적용한다면 업무효율성과 기업성과에 긍정적 영향을 주고, 이는 기업의 지속적 경쟁우위 획득으로 이어질 수 있을 것으로 기대된다.

• 디지털융복합연구
• /
• 제18권1호
• /
• pp.35-44
• /
• 2020

본 논문의 목적은 중국 IC 산업의 자원 활용과 전반적인 개발 수준을 반영한 중국 IC 산업의 효율성에 영향을 미치는 다양한 요인을 조사하기 위한 것이다. 본 논문에서는 2018년 영업이익이 10억 미만인 IC산업 상장기업 17개사를 대상으로 3개의 입력지표(R&D 지출, 종업원에게 지급된 비용, 고정자산 총액)와 2개의 출력지표(순이익, 판매수익)를 선정하고 기술효율성 이론과 DEA 분석법을 적용하여 아웃풋 기반 상대적 효율성을 분석하였다. 연구결과, 분석 대상 17개 기업 중 1개사는 효율적이고, 2개사는 부적합한 규모로 비효율적이며, 나머지는 생산기술과 규모, 경영수준이 미흡해 비효율적이라는 것을 파악하였다. 본 연구의 시사점은 중국의 중소 IC기업은 투입 자원을 적절히 축소하고, 기술혁신 관리를 통해 자원 활용의 효율성을 높여야 함을 제시한 것이다. 향후 맘퀴스트 분석을 통해 중국 중소 IC 회사의 동적 효율성 분석을 실시할 필요가 있다.

• 대한간호학회지
• /
• 제41권4호
• /
• pp.500-509
• /
• 2011

Purpose: Time-driven activity-based costing was applied to analyze the nursing activity cost and efficiency of a medical unit. Methods: Data were collected at a medical unit of a general hospital. Nursing activities were measured using a nursing activities inventory and classified as 6 domains using Easley-Storfjell Instrument. Descriptive statistics were used to identify general characteristics of the unit, nursing activities and activity time, and stochastic frontier model was adopted to estimate true activity time. Results: The average efficiency of the medical unit using theoretical resource capacity was 77%, however the efficiency using practical resource capacity was 96%. According to these results, the portion of non-added value time was estimated 23% and 4% each. The sums of total nursing activity costs were estimated 109,860,977 won in traditional activity-based costing and 84,427,126 won in time-driven activity-based costing. The difference in the two cost calculating methods was 25,433,851 won. Conclusion: These results indicate that the time-driven activity-based costing provides useful and more realistic information about the efficiency of unit operation compared to traditional activity-based costing. So time-driven activity-based costing is recommended as a performance evaluation framework for nursing departments based on cost management.

• 한국통신학회논문지
• /
• 제32권7B호
• /
• pp.422-430
• /
• 2007

현재 WDM-PON 기술은 FTTH 구축을 위해 가장 핵심적인 가입자망 기술로 인식되고 있다. 하지만 시스템 비용의 많은 부분을 차지하는 광 송수신기 및 RN과 밀접한 관계가 있는 WDM-PON 시스템 자원의 고정적인 관리방법은 비용 대비 시스템 자원 효율성에 한계점을 가지고 있다. 이에 본 논문에서는 자원의 동적 관리가 가능하면서 이를 위한 시스템의 구축비용 최소화를 이룰 수 있는 WDM-PON 구조를 제안한다. 이를 위해 ONU의 논리그룹화 및 논리그룹 간 파장 공유를 위한 OLT, ONU 그리고 RN의 구조를 설계하고, 이를 기반으로 탄력적인 동적자원 관리를 위한 동적 자원 할당 기법을 제안한다. 이와 같은 WDM-PON 구조의 성능 분석을 위해 모의실험을 수행하였고, 그 결과 논리그룹의 크기와 시스템 구축비용의 상관관계 및 논리그룹 크기와 동적 자원 할당 능력의 상관관계를 도출할 수 있었으며, 자원 관리 기법의 동적 자원 할당 능력과 공평성 유지 능력을 확인할 수 있었다.

• 보건의료산업학회지
• /
• 제9권1호
• /
• pp.17-29
• /
• 2015

This study, an examination of the plan for effective resource management for national university hospitals, was performed to determine the relationship between the effectiveness of patient output by considering input personnel using the DEA model and Management Performance, in which 4 years of data from 12 national university hospitals were analyzed. Among the components of the effectiveness, utilizing properly imput components from the application of VRS(Variable Returns to Scale), the Management Performance of national university hospitals was found to be affirmatively influenced by PTE(Pure Technical Efficiency). Regarding the Management Performance of national university hospitals in their attempts to establish a plan for effective human resource management, the management of patient numbers on the basis of calculation level with input is more recommendable than the controlling of personnel input using patient numbers. Thus, the establishment of a strategy plan for the proper allocation of administrative staff and sickbeds, considering the variation of patient numbers, is suggested.

• 전기학회논문지
• /
• 제59권9호
• /
• pp.1566-1574
• /
• 2010

This paper presents an in-depth review for current status for demand-side management (DSM) investment of energy supplier and an useful prospect on the introduction of Energy Efficiency Resource Standards (EERS). According to the Article 9 of Rational Energy Utilization Act, Energy suppliers-Korea Electric Power Corporation (KEPCO), Korea Gas Corporation (KOGAS) and Korea District Heat Corporation (KDHC) prescribed by Presidential Decree-must establish and implement annual demand-side management investment plan to improve energy efficiency in production, transformation, transportation, storage and usage of corresponding energy and to reduce demand and green house gas emissions. In this paper, we examine the DSM programs of energy suppliers and the results of DSM investment in 2009, then we propose a reasonable solution for the development of DSM investment. Furthermore, in order to compare our situation, the case studies were conducted on EERS issues in England, Italy, France and U.S, such as establishing the energy saving target, selecting the target energy supplier, and penalty and incentive mechanisms. Throughout the case studies, this paper suggests the directions to the DSM investment planning of energy suppliers and the major issues to prepare EERS in Korea.

• 자원ㆍ환경경제연구
• /
• 제11권3호
• /
• pp.345-375
• /
• 2002

The purpose of this paper is to measure the change of the production efficiency which may happen when environmental regulation incurs technological constraint in the process of production, and to compute the opportunity cost of pollution reduction with the lost products based on the change of efficiency. The patterns of production technoloy in the paper are divided into the technologies of strong disposability and weak disposabilty to grasp the effect of the technological constraint due to the environmental regulation. The endowment of the technolgical constraints in the process of production is considered to bring the greatest restriction on firm's production. When the environmental efficiencies of Korean regional manufactures were measured with linear programming model, the lost products related with the constraint of production technology that environmental regulation incurred, was average 148.1 billion dollar per year(5.87% of one year overall products) for total manufactures in 1991~1998. The ratio of the lost products for total products was spread from 0.78% to 1l.08%. The average lost products of 15 regions were changed from 4.66% to 18.35% of total products. Generally the environmental efficiency index of regional manufactures being decreased continuously since 1991, it is estimated that the environmental performance of Korean manufactures has been more and more deteriorating.

• Journal of Communications and Networks
• /
• 제12권2호
• /
• pp.130-139
• /
• 2010

Environmental issues and the need to reduce energy consumption for lowering operating costs have pushed power efficiency to become one of the major issues of current research in the field of wireless networks. This paper addresses a number of multiple input multiple output (MIMO) precoding and scheduling techniques across the PHY and MAC layers that can operate under a reduced link budget and collectively improve the transmit power efficiency of a base station, while maintaining the same levels of service. Different MIMO transmission and precoding schemes proposed for LTE, achieving varying degrees of multiuser diversity in both the time, frequency as well as the space domain, are examined. Several fairness-aware resource allocation algorithms are applied to the considered MIMO schemes and a detailed analysis of the tradeoffs between power efficiency and quality of service is presented. This paper explicitly examines the performance of a system serving real-time, VoIP traffic under different traffic loading conditions and transmit power levels. It is demonstrated that by use of efficient scheduling and resource allocation techniques significant savings in terms of consumed energy can be achieved, without compromising QoS.

• 대한전자공학회논문지TC
• /
• 제48권4호
• /
• pp.77-83
• /
• 2011

본 논문은 OFDMA 시스템에서 지연 QoS와 시스템 용량 간의 트레이드오프에 대해 2차원 자원할당 관점에서 살펴보고, 주파수 다이버시티와 시간축 사용자 다중화가 지연 QoS 성능에 미치는 영향을 분석하였다. 이를 바탕으로 지연 QoS가 시스템의 주파수 효율 (spectral efficiency)에 영향을 미치는 영향을 살펴보았다. 특히, 높은 SNR 영역에서 시간축 다중화도 (degree of multiplexing)에 따른 주파수 효율의 변화를 분석하여 효율적인 다중화 기법에 대한 방향을 제시하였다. 마지막으로 모의실험을 통하여 분석 결과를 검증하였으며, 최적의 다중화도를 이용할 때 상당한 성능이득을 얻을 수 있음을 확인하였다.