• The Korean Journal of Financial Studies
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• v.11 no.1
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• pp.61-99
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• 2005

신용평가제도는 오늘날 그 영향력이 강력해져 사실상 세계자본시장의 문지기역할을 하고 있다. 본 논문에서는 이와 같이 신용평가기관의 중요성과 영향력의 증대와 더불어 이들 평가기관의 활동에 대한 비판과 감시가 커지고 있는 이때에 아직 선진수준에 미치지 못하는 국내신용평가기관들의 현황과 평가체계를 살펴보고 선진국의 신용평가기관들과 비교해 봄으로써 앞으로 나아갈 방향을 모색해보고자 하였다. 국내 신용평가기관들의 현황을 살펴본 결과 신용평가절차에 있어서 기준이 경영상태, 성장성, 그리고 재무구조의 건전성에 있어야 함에도 불구하고 이러한 기본적인 요인들의 영향력은 미미한 반면, 비공개적이고 불투명하며 비경제적인 요인들이 중요한 비중을 차지하고 있었다. 이에 반하여 선진신용평가기관들의 분석결과는 그 신뢰도에 믿음을 가질 수 있고, 대내외적인 공신력을 인정받고 있으며, 평가과정이 매우 주관적이어서 그 내용을 모두 공개하지 않지만, 국내의 신용평가과정보다는 투명성을 인정받고 있다는 것도 사실이다. 따라서 국내신용평가기관들의 나아갈 바를 살펴보면 다음과 같다. 첫째, 비재무적 요인의 평가기준에 대한 인식의 재정립이 요구되고 있다. 장기적인 시각으로 비재무적 요인에 대한 평가기준과 방법에 대한 체계의 정립이 요구되며, 전문적이고 객관적이면서도 뚜렷한 평가기관의 주관이 있는 평가가 이루어져야 할 것이다. 둘째, 신용평가방법과 기준의 강화로 대외적인 공신력을 얻도록 해야 한다. 이를 위한 방안의 하나로 성장성, 수익성, 그리고 안정성 비율 모두를 반영할 수 있는 신용평가모형을 개발하고, 자기자본비율의 대폭적인 상승이나 현금흐름의 양호여부, 경제적 부가가치(EVA), 고정장기적합률의 이행기준의 설정 등에 대한 평가기준의 재정립이 강구되어야 할 것이다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.5
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• pp.1215-1223
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• 2014

In multi-hop wireless networks, a message transmission path is set up on demand by a route discovery step, where a shortest path is used in general. The shortest path, however, normally uses the nodes near the center area, which causes a high traffic load in that area and reduces the message transmission reliability. We propose a stable routing protocol considering the remaining energy of nodes. Our protocol uses ETX as a link performance estimator and tries to avoid the nodes with smaller energy. By doing this, we can reduce the route failure probability and packet loss. We have evaluated the performance of the proposed protocol using QualNet and compared with AODV and MRFR protocols. The simulation result shows that our protocol has a similar performance as MRFR in terms of end-to-end message reception ratio, average message delay and delay jitter, but outperforms MRFR in terms of traffic load distribution.

• Applied Chemistry for Engineering
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• v.30 no.4
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• pp.453-459
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• 2019

In this study, the influence factors on the stability of the O/W (oil in water) emulsions prepared with coconut oil and the nonionic mixed surfactant (Tween 80-Span 80) were evaluated. The concentration and HLB value of the nonionic mixed surfactant, and the degree of agitation were used as manufacture factors. The stability of prepared O/W emulsions were measured with the mean droplet size, zeta-potential, emulsion stability index (ESI), and thermal instability index (TII). The mean droplet size of the prepared O/W emulsions was from 100 to 200 nm. As the concentration of mixed surfactant and the homogenization speed increased, the droplet sizes decreased, while the zeta-potential values increased. The effect of HLB values increased in the order of 6.0, 10.0 and 8.0, and at the HLB value of 8 the smallest mean droplet size as 120 nm was obtained whereas the largest value of the zeta-potential between 10 and 60 mV. From the results of ESI and TII, the stability of prepared O/W emulsions increased in order of 6.0, 10.0 and 8.0 of HLB values, and ESI and TII values were above 80% and below 20% respectively at HLB value of 8.0.

• Korean Journal of Construction Engineering and Management
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• v.17 no.4
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• pp.87-94
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• 2016

The necessity to consider stability of underground structures constructed below or adjacent ammunition depots has been increased since the expansion of urban area and construction of infrastructure. However, there are a few studies on influence of accidental explosion on underground structures. In this study, the process of assessing the stability of underground structures is suggested and its applicability is verified through the case study. AUTODYN and SPACECLAIM are used to execute the structure and geotechnical modelling, and explosion effect is simulated and vibration velocities are calculated. According to the result of this case study, it is concluded that underground structure constructed 70m below ground might be rarely influenced by the simulated explosion. The process used in this study could be used to design the underground ammunition complex and analyse the stability of underground facilities being influenced by periodical vibration.

• Journal of Dental Rehabilitation and Applied Science
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• v.34 no.2
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• pp.80-88
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• 2018

Purpose: Implant surface modification and implant design are the principle targets for achieving successful primary stability. The aim of this study was to measure implant stability quotient (ISQ) values of sandblasted, large-grit, acid-etched (SLA) implants with tapered straight body design during the healing period, and to determine the various factors affecting implant stability. Materials and Methods: To measure implant stability, resonance frequency analysis (RFA) was performed in 26 patients (13 women and 13 men) with 44 SLA implants with tapered straight body design. Implant stability (ISQ values) was evaluated at baseline and healing abutment connection (12 weeks), and the correlations between RFA and insertion torque (IT), bone quality, and jawbone were determined. Results: The mean ISQ value of the implants was $69.4{\pm}10.2$ at the time of implant placement (baseline) and $81.4{\pm}6.9$ at the time of healing abutment connection (P < 0.05). Significant differences were found between RFA and bone quality and between RFA and jawbone (P < 0.05). No significant differences were found between RFA and IT, insertion area, fixture diameter, and implant length (P > 0.05). Conclusion: ISQ values of SLA implants with tapered straight body design were high at baseline and healing abutment connection. It was concluded that SLA implants with tapered straight body design show improved primary and secondary stability, and that immediate or early loading may be applicable.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 2002.08a
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• pp.92-99
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• 2002

1995년 일본 고베지진 이후 우리나라에서도 지진에 대한 연구가 활발히 이루어지고 있으며, 현재 국내 여러 기간시설에 대한 내진안전성 평가와 내진설계가 실시되고 있다. 국내 기존 항만시설에 대해서도 내진 안정성 평가가 수행되고 있으며 현재계획ㆍ시공되고 있는 항만에서도 내진설계가 반영되고 있다. 중요한 항만시설물 중 하나인 잔교식 안벽은 연직말뚝과 경사말쪽을 조합하여 사용하고 있으나, 최근 내진설계에서 경사말뚝이 지진과 같은 동적 하중에 취약하다는 이유로 사용에 제한을 받고 있다. (중략)

• Geotechnical Engineering
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• v.24 no.2
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• pp.35-45
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• 2008

• Proceedings of the Korean Aquaculture Society Conference
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• 2004.05a
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• pp.381-382
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• 2004

• Journal of Navigation and Port Research
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• v.29 no.6 s.102
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• pp.561-566
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• 2005

This study was carried out to amlyze and compare the stability of a 50ton container crane according to various wind load design codes. The wind load was evaluated according to 'The Specification of Port Facilities and Equipments / Specification for the design of crane structures (KS A 1627)' and 'Load Criteria of Building Structures' effected by the ministry of construction & transportation And the uplift forces qf a container crane under this wind load were estimated by amlyzing reaction forces at each supporting point and compared each other. From this study, we noticed that the design wind velocity criteria need to be defined specifically when the wind load is evaluated to design a container crane. And we verified the necessity of the estimation of the uplift forces at each supporting point to analyze a structural stability of a container crane and the maximum compressive force in order to consider the stability of the ground foundation of the berth.

• Applied Chemistry for Engineering
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• v.8 no.2
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• pp.252-261
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• 1997

The effect of solvent on the dispersion stability of $CaCO_3$ pigment in various solvents and resin solutions has been studied using Dynometer. Dispersion stability can be estimated in a relatively short time by means of Dynometer and the solubility parameter, ${\delta}$, of $CaCO_3$ determined from dispersion stability was 11.62(${\delta}_d=8.04$, ${\delta}_p=5.05$, ${\delta}_h=6.70$). The solvent showing weaker interaction with pigment increased the adsorption of resin on to the pigment, resulting in higher dispersion stability in resin solution. It was found that the rheological properties and dispersion stability of pigmented resin solution were depending strongly on the solvent added in small amount in the formulation.