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Computer-Aided Cooling Curve Analysis of A356 Aluminum Alloy
Ihsan-ul-haq,Shin, Je-Sik,Lee, Zin-Hyoung 대한금속재료학회 2004 METALS AND MATERIALS International Vol.10 No.1
Computer aided cooling curve analysis (CA-CCA) is very useful in the foundry industry for easy and fast evaluation of a variety of properties. Typical applications include the prediction of the temperatures and amounts of different phases appearing during solidification and monitoring of the quality of melt in terms of Si- modification, grain refinement, inoculation, and graphite spheoridization. The use of cooling curve analysis can be extended to many other areas of solidification also, assuming the calculated values are reasonably accurate. The calculation of zero curve, which is vital in cooling curve analysis, offers many problems however. In this study, an attempt was made to investigate the problems of zero curve calculation and a new method is suggested to minimize calculation errors. An in-house developed computer program was used for a complete analysis of aluminum alloy A356 to determine the latent heat and solid fraction values.
Analysis of Phytohormones and Phosphate Solubilization in Photorhabdus spp.
Ihsan Ullah,Abdur Rahim Khan,박건석,임종희,Muhammad Waqas,이인중,신재호 한국식품과학회 2013 Food Science and Biotechnology Vol.22 No.suppl1
Bacteria of the genus Photorhabdus are nematodes (Heterorhabditidae) symbiont and highly entomopathogenic in nature. Present study was concerned to investigate the effects of Photorhabdus temperata M1021 and Photorhabdus luminescens TT01 on plant morphology and physiology (‘Dongjin-beyo’ and ‘waitoc’). A significant (p<0.05) increase in the plant growth attributes including total plant length, root length, biomass,and chlorophyll contents were observed after treatment with culture extracts. Moreover indole-3-acetic acid (IAA)production by respective bacteria was confirmed by GCMS analysis. IAA production through tryptophan independent pathway was confirmed in P. temperata M1021 and P. luminescens TT01. Phosphate solubilization capability was also investigated by growing them on pikovskaya (PVK)agar as well as on PVK liquid medium with pH 7 at 28±2oC for 14 days. IAA production and phosphate solubilization capability of these bacteria could be the potential factors for plant growth promotion.
Reactive oxygen species-mediated unfolded protein response pathways in preimplantation embryos
Ihsan Ali,Syed Zahid Ali Shah,Yi Jin,Zhong-Shu Li,Obaid Ullah,Nan-Zhu Fang 대한수의학회 2017 Journal of Veterinary Science Vol.18 No.1
Excessive production of reactive oxygen species (ROS) and endoplasmic reticulum (ER) stress-mediated responses are critical to embryonic development in the challenging in vitro environment. ROS production increases during early embryonic development with the increase in protein requirements for cell survival and growth. The ER is a multifunctional cellular organelle responsible for protein folding, modification, and cellular homeostasis. ER stress is activated by a variety of factors including ROS. Such stress leads to activation of the adaptive unfolded protein response (UPR), which restores homeostasis. However, chronic stress can exceed the toleration level of the ER, resulting in cellular apoptosis. In this review, we briefly describe the generation and impact of ROS in preimplantation embryo development, the ROS-mediated activation mechanism of the UPR via the ER, and the subsequent activation of signaling pathways following ER stress in preimplantation embryos.
Ihsan Ullah JAN,김응규,정강옥 한국유통물류정책학회 2022 유통물류연구 Vol.9 No.4
This study examines the determinants of the green entrepreneurship intention of university undergraduate students. Specifically, the undergraduate students’ risk-taking propensity, environmental vision, and university conceptual support for green entrepreneurship are investigated as determinants for green entrepreneurship intention. We surveyed 212 undergraduate students from different universities in Daejeon, Korea, in October 2022 to empirically test the proposed relationships. A partial least squared(PLS) based structural equation modeling was conducted to test the proposed hypotheses. We found that the risk-taking propensity, environmental vision, and university conceptual support for the green entrepreneurship of undergraduate students have a significant positive effect on green entrepreneurship intention. Since green entrepreneurship is one of the emerging issues in the area of the green economy, therefore, the findings of this study have contributed to the literature to understand the determinants of green entrepreneurship. Furthermore, the current study offers insights to the practitioners to leverage the factors such as university conceptual support for green entrepreneurship to increase the students’ green entrepreneurship intentions.
Association Between High Platelet Indices and Proteinuria in Patients With Hypertension
Ihsan Ates,Mesudiye Bulut,Nihal Ozkayar,Fatih Dede 대한진단검사의학회 2015 Annals of Laboratory Medicine Vol.35 No.6
Background: We aimed to determine the association between platelet indices including plateletcrit (PCT), mean platelet volume (MPV), platelet distribution width (PDW), and proteinuria associated with hypertension (HT) as well as the relative power of each to predict proteinuria. Methods: The study included 223 patients (68 men and 155 women) with primary HT. PCT, MPV, PDW, and proteinuria levels were measured. The patients were divided into two groups according to proteinuria status based on 24-hr urinary protein excretion: proteinuria (+) group (15 men and 40 women) and proteinuria (-) group (53 men and 115 women). Results: The mean and SD of platelet count, PDW, PCT, and MPV were 278.8±49.6 ×109/L, 13.5±1.8%, 0.31±0.07%, and 11.3±2.6 fL, respectively. The mean platelet count, PCT, MPV, and PDW were significantly higher in the proteinuria (+) group than in the proteinuria (-) group (P<0.05); there were no significant differences in the other blood parameters between the two groups. The platelet count, PCT, MPV, and PDW were independent risk factors predictive of proteinuria according to a stepwise regression analysis of PDW, PCT, and MPV. PCT was the strongest independent predictor of proteinuria. Conclusions: The platelet indices PCT, PDW, and MPV were significantly higher in patients with proteinuria than in those without it. Among these three indices, PCT was the strongest predictor of proteinuria.
Shilling Attacks Against Memory-Based Privacy-Preserving Recommendation Algorithms
( Ihsan Gunes ),( Alper Bilge ),( Huseyin Polat ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.5
Privacy-preserving collaborative filtering schemes are becoming increasingly popular because they handle the information overload problem without jeopardizing privacy. However, they may be susceptible to shilling or profile injection attacks, similar to traditional recommender systems without privacy measures. Although researchers have proposed various privacy-preserving recommendation frameworks, it has not been shown that such schemes are resistant to profile injection attacks. In this study, we investigate two memory-based privacy-preserving collaborative filtering algorithms and analyze their robustness against several shilling attack strategies. We first design and apply formerly proposed shilling attack techniques to privately collected databases. We analyze their effectiveness in manipulating predicted recommendations by experimenting on real data-based benchmark data sets. We show that it is still possible to manipulate the predictions significantly on databases consisting of masked preferences even though a few of the attack strategies are not effective in a privacy-preserving environment.