• 한국IT서비스학회지
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• 제8권4호
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• pp.57-73
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• 2009

The rapid development of IT and the large-scale investment of IT motivate the public agencies to find the ways of effective IT management. Even though the public agencies adopt Enterprise Architecture (EA) as the new alternative for effective IT management, EA practices are still insufficient in the area of utilization and management after the adoption. Therefore, this research aims to identify the influencing factors for improving EA maturity level in terms of the long-term business activities such as establishment, management and utilization. Also, this research empirically identifies the influencing factors on the adoption and operation of EA in the public agencies, and clarifies how such factors impact on EA maturity level.

• KIEAE Journal
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• 제14권4호
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• pp.47-52
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• 2014

The problem of energy consumption is more serious in university buildings than primary, middle and high school buildings. Because university buildings have generally heating and cooling systems, and various incidental facilities. In university, the library is one of the building that many people use and the most energy is spent. So, investigation on energy saving is very important and urgent. This study aims finally to present the guideline for low-energy design of University library by aiding a designer to select best solution in the side of energy-saving. In this paper, composition of space, utilization schedule and performance of construction materials are grasped, some primary factors that effect to energy saving are analyzed by energy simulation. The result of this study is as follows; First, the subject library has more cooling load than heating load because of cooling load generated during middle season. Second, green roofs is the most effective to heating load saving, but not to cooling energy. Third, outdoor air cooling is the most effective to cooling energy saving among the investigated strategies included in this study.

• 한국통신학회논문지
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• 제16권9호
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• pp.819-827
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• 1991

국내 FM 방송채널을 기존의 200 KHz 간격으로 배치 했을 때와 100 KHz로 배치 했을 때, 송신출력, 지형굴곡계수, 송신 안테나 실효높이를 변수로 하여 효율 적인 방송망을 규정하고 채널을 배치하여 동일한 조건에서 스펙트럼의 이용효율을 산출·비교하였다. 그 결과 100 KHz 간격으로 채널을 배치하게 되면 200 KHz에 비해 사용가능한 채널 수는 두배로 늘어나고 스펙트럼의 이용효율은 최소 35.5%에서 최대 100%까지 증가시킬 수 있음을 알 수 있었다.

• 무역상무연구
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• 제13권
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• pp.389-409
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• 2000

Recent demands of market forces are causing considerable attention to be forced on logistics functions and revitalizing interest in outsourcing them. The need to efficiently and economically adjust support to meet market demands is growing significantly. Logistics is playing a role it has never played before. In light of this, outsourcing to third parties has become a strategic issue demanding greater attention in corporate boardrooms. From the perspective of TPL users, this paper focuses on how best to make a strategic plan for the effective utilization of TPL. And the results are as follows : First, after deciding their logistics outsourcing, the companies have to set up the aim of TPL through development of logistical strategies. Second, the companies must decide service provider that fits to their business environment and conditions. Third, they have to conclude a contract with logistics service provider. Fourth, after doing the preparatory implementation they carry into effect the original implementation. Fifth, they use the result of original implementation to fix a partnership.

• 한국통신학회논문지
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• 제35권3B호
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• pp.390-397
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• 2010

본 논문은 IPTV 서비스를 제공함에 있어, 네트워크 효율성과 채널 변경 지연을 고려하는 효과적인 채널 관리 알고리즘을 제안한다. 제안하는 알고리즘은 각 채널의 타입과 각 채널을 통해 전송될 영상 데이터에 삽입할 부가적인 인트라 프레임의 개수를 조절하여, 각 사용자의 최대 평균 채널 변경 지연이 임계값 이하가 되도록 하면서 IPTV 서비스 관련 네트워크 대역폭 사용량을 최소화한다. 실험 결과에서 제안하는 알고리즘의 성능을 보인다.

• Journal of Power Electronics
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• 제16권6호
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• pp.2067-2075
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• 2016

Cascaded H-bridge multilevel inverters are currently used because it enables the integration of various sources, such as batteries, ultracapacitors, photovoltaic array and fuel cells in a single system. Conventional modulation schemes for multilevel inverters have concentrated mainly on the generation of a low harmonic output voltage, which results in less effective utilization of connected sources. Less effective utilization leads to a difference in the charging/discharging of sources, causing unsteady voltages over a long period of operation and a reduction in the lifetime of the sources. Hence, a charge balance control scheme has to be incorporated along with the modulation scheme to overcome these issues. In this paper, a new approach for charge balancing in symmetric cascaded H-bridge multilevel inverter that enables almost 100% charge balancing of sources is presented. The proposed method achieves charge balancing without any additional stages or complex circuit or considerable computational requirement. The validity of the proposed method is verified through simulation and experiments.

• 산업경영시스템학회지
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• 제21권46호
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• pp.137-146
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• 1998

Most studies related to AS/RS are about operation policies or system designs. However, the studies on operation policy could not deal with various products using the single unit load system. In this paper, two different sized units are introduced and six different AS/RS operation policies are developed to process the different sized items. Computer simulation is used to evaluate AS/RS performances on various operation policies and to find the most effective operation policy for each case. The simulation model is developed using GPSS/PC and operation policies include COL-FIFO-SP, SIL-FIFO-SP, COL-RN-SP, COL-FIFO-LP, SIL-FIFO-LP and COL-RN-LP. The policies are evaluated based on the criteria of crane utilization, rack utilization, crane moving time, throughput and waiting time.

• Journal of Information Processing Systems
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• 제17권6호
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• pp.1157-1169
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• 2021

Modern graphics processor unit (GPU) architectures offer significant hardware resource enhancements for parallel computing. However, without software optimization, GPUs continuously exhibit hardware resource underutilization. In this paper, we indicate the need to alter different warp scheduler schemes during different kernel execution periods to improve resource utilization. Existing warp schedulers cannot be aware of the kernel progress to provide an effective scheduling policy. In addition, we identified the potential for improving resource utilization for multiple-warp-scheduler GPUs by sharing stalling warps with selected warp schedulers. To address the efficiency issue of the present GPU, we coordinated the kernel-aware warp scheduler and warp sharing mechanism (KAWS). The proposed warp scheduler acknowledges the execution progress of the running kernel to adapt to a more effective scheduling policy when the kernel progress attains a point of resource underutilization. Meanwhile, the warp-sharing mechanism distributes stalling warps to different warp schedulers wherein the execution pipeline unit is ready. Our design achieves performance that is on an average higher than that of the traditional warp scheduler by 7.97% and employs marginal additional hardware overhead.

• 한국병원경영학회지
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• 제14권1호
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• pp.36-61
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• 2009

This study focused on finding the variation of medical service utilization, paths of medical service utilization and medical payments of the patients died by cerebrovascular diseases. For this study, data of the one-year episodes of the health insurance subscribers died in 2004 were selected. The frequency of medical visits, the lengths of stays, the days of outpatient visits, the total period of medical services and the total medical payments were compared by the characteristics of the suppliers and utilizers. This study is useful in reviewing the equity of medical service utilization because it analyzed variance in utilization by episodes. In oder to collect accurate data of the patients died by cerebrovascular diseases in 2004 the 2004 reimbursement data of all medical institutions were matched to the data of funeral fee payment by the National Health Insurance Corporation from January 2004 to May 2005. The major results of the study are as follows. The variation of medical service utilization of cerebrovascular diseases was influenced by supplier factors suppliers, such as types and locations of medical institutions and user factors such as sex and age. It was suspected that the reimbursement by fee-for-service contributed to the variation quite a lot, but we could not compare the variation between the different reimbursement systems in Korea. On the basis of analyzing results this study suggests that the factors of suppliers and utilizers should be reviewed to reduce the under use and over use expressed by variations of medical service. The processes of care, effective communication and management system should be investigated for the equity of medical service utilization and also. alternative medical services would be recommended to reduce the high medical payment. Additionally to find other causes of variation further in depth study controling the severity of diseases, socio-economic status of the users and the system factors is required.

• Mycobiology
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• 제46권4호
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• pp.382-387
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• 2018

The entomopathogenic fungus Cordyceps militaris is a valuable medicinal ascomycete, which degenerates frequently during subsequent culture. To avoid economic losses during industrialized production, scratching stimuli of mycelia was introduced to improve the fruiting body production. The present results indicated that higher yields and biological efficiency were obtained from two degenerate strains (YN1-14 and YN2-7) but not from g38 (an insertional mutant in Rhf1 gene with higher yields and shorter growth periods). Furthermore, the growth periods of the fruiting bodies were at least 5 days earlier when the mycelia were scratched before stromata differentiation. Three ROS-scavenging genes including Cu/Zn superoxide dismutase (CmSod1), Glutathione peroxidase (CmGpx), and Catalase A (CmCat A) were isolated and their expression profiles against scratching were determined in degenerate strain YN1-14 and mutant strain g38. At day 5 after scratching, the expression level of CmGpx significantly decreased for strain g38, but that of CmSod1 significantly increased for YN1-14. These results indicated that scratching is an effective way to promote fruiting body production of degenerate strain, which may be related at least with Rhf1 and active oxygen scavenging genes.