• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권8호
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• pp.2027-2041
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• 2013

In this paper, we propose a novel reversible data hiding scheme in the index tables of the vector quantization (VQ) compressed images based on index set construction strategy. On the sender side, three index sets are constructed, in which the first set and the second set include the indices with greater and less occurrence numbers in the given VQ index table, respectively. The index values in the index table belonging to the second set are added with prefixes from the third set to eliminate the collision with the two derived mapping sets of the first set, and this operation of adding prefixes has data hiding capability additionally. The main data embedding procedure can be achieved easily by mapping the index values in the first set to the corresponding values in the two derived mapping sets. The same three index sets reconstructed on the receiver side ensure the correctness of secret data extraction and the lossless recovery of index table. Experimental results demonstrate the effectiveness of the proposed scheme.

• 한국물환경학회지
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• 제23권6호
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• pp.973-984
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• 2007

This study developed and calculated alternative evaluation index (AEI) from the effectiveness analyses of alternatives for rehabilitation of distorted hydrologic cycle. The feasible alternatives for the poor-conditioned region in the Anyangcheon watershed were proposed and quantitatively analyzed using continuous water quantity/quality simulation model, Hydrological Simulation Program-Fortran (HSPF). The effectiveness analyses include 355th flow and 275th flow of flow duration curve and number of increased days to satisfy the target monthly flow for water quantity and BOD average concentration, total daily loads and number of increased days to satisfy the target concentration and total daily loads. The feasible alternatives are restoration of covered stream, prevention of streamflow loss through sewers, redevelopment of existing reservoir, reuse of treated wastewater, use of groundwater collected by subway stations and construction of small wastewater treatment plant. Therefore, alternative priority ranking was derived from AEIs. It will be effective to make an integrated watershed management for sustainable development.

• 동력기계공학회지
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• 제20권5호
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• pp.78-85
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• 2016

This paper considers the influence of internal heat exchangers to the efficiency of a refrigerating system using R170. These liquid-gas heat exchangers(internal or suction-line heat exchangers) can, in some cases, yield improved system performance while in other cases they degrade system performance. A steady state mathematical model is used to analysis the performance characteristics of refrigeration system with internal heat exchanger. The influence of operating conditions, such as the mass flowrate of R170, inner diameter tube and length of internal heat exchanger, to optimal dimensions of the heat exchanger is also analyzed in the paper. The main results were summarized as follows : the mass flowrate of R170, inner diameter tube and length of internal heat exchanger, and effectiveness have an effect on the cooling capacity, compressor work and RCI(Relative Capacity Index) of this system. Exception for the effect of inner diameter, the RCI of R170 with respect to refrigerant mass flowrate, the length and effectiveness of internal heat exchanger is about 2.1~3.3% higher than that of R13 at the same experimental conditions. With a thorough grasp of these effect, it is necessary to design the R170 compression refrigeration cycle using internal heat exchanger.

• 전기학회논문지P
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• 제66권4호
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• pp.206-212
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• 2017

In this paper, using the power system information obtained from real-time monitoring device, to analyze the voltage stability margin index and described the voltage stability control scheme for voltage stability enhancement. Based on the utilization of the voltage stability monitoring index based on local information provided by the PMU(Phasor Measurement Unit), the purpose of the plan is to control the system stably in real time. In order to apply the load control scheme, the voltage stability margin is calculated using the data acquired through the PMU installed in each load bus. If the voltage drops below a certain level, load control is performed for each. The effectiveness of the voltage stability control measures is applied to the actual KEPCO system to analyze the effectiveness.

• 정보관리학회지
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• 제6권2호
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• pp.69-85
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• 1989

본 연구는 도서관 혹은 정보센터의 중요업무인 문헌탐색을 처리하는데 있어, 어떤 방법이 보다 신속하고 비용이 적게 들며, 효율적인가를 알아보기 위해 수작업탐색과 온라인탐색의 비용·효과를 비교·분석하였다. S대학교 의과대학 도서관에서 MEDLINE 데이터 베이스와 그에 해당하는 색인지 Index Medicus를 이용하여 6개의 질문을 탐색하였다.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2009년도 춘계학술대회
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• pp.501-510
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• 2009

Recently, there has been growing interest in the financial and economic effectiveness of service quality and customer satisfaction. It means that the final goal of customer satisfaction is the maximization with firms' financial performance, enterprise could survive through the creation of continuous financial performance. Companies are working in various ways to identify the direct relationship of service quality and customer satisfaction with financial and economic effectiveness in order to justify and validate customer satisfaction management. In this study, the influence of customer satisfaction on the financial performance is examined. Customer satisfaction index, the key non-financial performance measure has significant association with firms' financial performance index. Moreover, high customer satisfaction has a competitive advantage, so it can be the key success factor of firm's financial performance improvement.

• 한국품질경영학회:학술대회논문집
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• 한국품질경영학회 2009년도 추계학술대회
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• pp.109-114
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• 2009

Recently, there has been growing interest in the financial and economic effectiveness of service quality and customer satisfaction. It means that the final goal of customer satisfaction is the maximization with firms' financial performance, enterprise could survive through the creation of continuous financial performance. Companies are working in various ways to identify the direct relationship of service quality and customer satisfaction with financial and economic effectiveness in order to justify and validate customer satisfaction management. In this study, the influence of customer satisfaction on the financial performance is examined. Also, we have analyzed customer satisfaction by comparing financial outcome of each industry Customer satisfaction index, the key non-financial performance measure has significant association with firms' financial performance index. Moreover, high customer satisfaction has a competitive advantage, so it can be the key success factor of firm's financial performance improvement.

• 한방재활의학과학회지
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• 제21권2호
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• pp.299-307
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• 2011

This study was performed to report the effectiveness of upper cervical chuna and release of cranial base on patients with dry eye syndrome. The patients diagnosed as dry eye syndrome and treated with upper cervical chuna and release of cranial base. Outcomes were measured by ocular surface disease index(OSDI). After treatments, discomfort and ocular surface disease index decreased. These results suggest that upper cervical chuna and release of cranial base were effective on patients with dry eye syndrome.

• 한국운동역학회지
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• 제24권4호
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• pp.417-423
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• 2014

The purpose of this study was to compare two saddle height determination methods by the effectiveness of pedal reaction force. Ten male subjects (age: $24.0{\pm}2.4years$, height: $175.1{\pm}5.4cm$, weight: $69.3{\pm}11.1kg$, inseam: $77.8{\pm}4.5cm$) participated in three minutes, 60 rpm cycle pedaling tests with the same load and cadence. Subject's saddle height was determined by $25^{\circ}$ knee flexion angle (K25) when the pedal crank was at the 6 o'clock position (knee angle method) and 97% (T97), 100% (T100), 103% (T103) of trochanter height (trochanteric method). The RF (resultant force), EF (effective force), and IE (index of effectiveness) were compared by measuring 3D motion and 3-axis pedal reaction force data during 4 pedaling phases (phase1: $330^{\circ}-30^{\circ}$, phase2: $30^{\circ}-150^{\circ}$, phase3: $150^{\circ}-210$, phase4: $210^{\circ}-330^{\circ}$). Results showed that there were significant differences in EF at phase1 between T97 and K25, in EF at phase4 between T100 and T103, in IE at total phase between T97 and K25, between T100 and T103, in IE at phase1 & phase2 between T97 and K25. There was higher IE in the K25 than any other saddle heights, which means that K25 was better pedaling effectiveness than the trochanteric method. Therefore it was suggested the saddle height as 103.7% of trochanter height that converted from K25.

• 소프트웨어공학소사이어티 논문지
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• 제24권3호
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• pp.91-99
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• 2011

국가 방위를 위한 무기체계의 획득은 다른 분야와 비교할 때 상대적으로 비용이 과다히 소모되고, 획득자원의 시험과정 등이 매우 위험하며 획득결과의 품질이 매우 중요하다. 이러한 무기체계 획득의 특성으로 인해서 모의실험이 필수적으로 이루어지고 있으며, 이를 시뮬레이션 기반 획득(SBA, Simulation Based Acquisition) 이라고 한다. 그런데, 모의실험을 위한 모델개발 및 이의 실행분석이 갖는 비용이 무시할 수 없는 수준이기 때문에 모의실험이 갖는 효과도에 대한 분석에 대한 연구필요성이 제기되어 왔다. 본 연구에서는 이러한 효과도 분석에 요구되는 4가지의 지표를 제시하고, 이 지표들이 기존 연구에 어떻게 적용될 수 있는지에 대한 사례분석을 수행하였다. 비록 기존 연구들이 이러한 지표를 고려하지 않았지만, 본 논문에서 명시하고 있는 효과도에 대한 고찰을 통해 모의실험의 국방 획득 과정에서의 필요성을 확인 할 수 있다.