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RISS 인기검색어
- 검색키워드
- 저자 : Emrah Bulut (검색결과 3 건)
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Are Marine Accident Really Accident? Fallacy of Random Marine Accidents in Dry Cargo Fleet
Emrah BULUT,Shigeru YOSHIDA 한국해운물류학회 2015 The Asian journal of shipping and Logistics Vol.31 No.2
The aim of this paper is to investigate the relation between marine casualty and dry bulk cargo freight rate according to the existence of spurious accident phenomenon in the dry cargo vessel accidents. According to the conventional expectation, the volume of marine accidents is a random process since it is accidently occurred and not a man-made outcome. Under this circumstance, it is expected that the volume of marine accidents should be statistically uncorrelated with the freight market rates and positively correlated with the fleet size. However, the existence statistics on dry cargo marine accidents indicate high level of negative correlation with freight markets (-0.95 for no. of vessels and -0.79 for the volume of accidents in dwt) and also high level of negative correlation with the fleet size (-0.81 for the volume of accidents in dwt). The asymmetric interaction between the widely accepted facts and the statistical foundations is the main concern of this paper which is named the “Fallacy of Random Marine Accidents (FRMA)”. The possible reasons of the FRMA phenomenon are considered to be based on the man-made marine accidents because of the financial collapse or as the well known term the credit default risk.
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Performance assessment for liner shipping industry
Zi-Yi Gao,Okan Duru,Emrah Bulut,Shigeru Yoshida 인하대학교 정석물류통상연구원 2013 JOURNAL OF INTERNATIONAL LOGISTICS AND TRADE Vol.11 No.2
This paper investigates the performance assessment of liner shipping industry and presents a multi-dimensional evaluation framework to ensure both financial and non-financial monitoring. The traditional performance assessment approach is based on the financial indicators such as ratio analysis, but it is limited to the fiscal perspective. The meaning of performance has dramatically changed and non-financial (and intangible) assets increased their importance in recent years. Under these circumstances, the multi-attribute performance assessment methods play a critical role to combine many aspects of the business. Balanced Scorecard (BSC) is originally developed for the multi-attribute performance assessment and its philosophy on business process evaluation pioneered the importance of key performance indicators and the quality management issues including the internal customer. Service quality and the business performance assessment are some of the hot issues in the liner shipping industry and the long term competitiveness is a critical concern in the recent liner shipping business. The BSC method is utilized to ensure a cumulative analysis of the short/long and tangible/intangible indicators of performance and computes the weight of each criterion by using Fuzzy-AHP method in the liner shipping industry.
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Ekici Mesut Ramazan,Tabar Emre,Hoşgör Gamze,Bulut Emrah,Atasoy Ahmet 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.9
This study investigates the effects of Zinc (Zn), Manganese (Mn), and Iron (Fe) additions on the microstructure, corrosion behaviour, biocompatibility, mechanical, and gamma-ray shielding properties of Magnesium (Mg) alloys prepared in various compositions using powder metallurgy (PM). The microstructure and mechanical properties of these alloys were analyzed using electron microscopes (SEM and FE-SEM) and X-ray diffraction (XRD) methods. The results showed positive changes in the material’s structure when the percentage of zinc added to pure magnesium increased. It was observed that the material became ductile, and the ductile fracture increased when the zinc ratio increased. The gamma-ray shielding properties of newly produced Mg-based alloys have also been discussed since they have a high potential for use in space technologies. Radiation shielding measurements have been performed using a 3′′ × 3″ NaI(Tl) scintillation detector NaI (Tl) gamma-ray spectrometer. The gamma-ray shielding parameters such as the linear attenuation coefficients (μl), mass attenuation coefficient (μm), effective atomic number (Zeff), half-value layer (HVL), and tenth-value layer (TVL) have been determined experimentally at photon energies of 0.511 MeV (emitted from a22Na radioactive point source) and 1.173 MeV and 1.332 MeV (emitting from a60Co radioactive point source). The obtained parameters have been compared to the theoretical results of the XCOM software, and a satisfactory agreement has been found. It can be said from the results that the Mg30Zn alloy has the best shielding properties among the produced materials.
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