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Ihsan Ullah,Anum Jamil,Imtiaz Ul Hassan,Byung-Seo Kim 대한전자공학회 2023 IEIE Transactions on Smart Processing & Computing Vol.12 No.6
Disasters have serious effects on peoples lives and buildings. Therefore, social media platforms, such as Twitter, have become more critical. They are crucial tools for responding to and managing disasters effectively. This study examined the effectiveness of various deep learning models, such as bidirectional encoder representations from transformers (BERT), gated recurrent units (GRU), and long short-term memory (LSTM) for classifying disaster-related tweets. Twitter data related to different disasters were collected using hashtags. The data were then cleaned, preprocessed, and manually annotated by a team. The annotated data were divided into training, validation, and testing sets. The data were used to train three models based on BERT, GRU, and LSTM for the categorical classification of disaster tweets. Finally, the three models were evaluated and compared using the test data. BERT achieved an accuracy of 96.2%, making it the most effective model. In contrast, the LSTM and GRU models achieved an accuracy of 93.2% and 88.4%, respectively. These findings underscore the potential effectiveness of deep learning models in classifying disaster-related tweets, offering insights that could enhance disaster management strategies, refine social media monitoring processes, bolster public safety, and provide directions for future research.
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.
Breast Mass Detected During Cardiac Stress Testing Which Led to Correct Diagnosis and Treatment
Ullah Ihsan,Laghari Abid Hussain,Farhad Awais,Adnan Ghufran,Nagher Babar 아시아심장혈관영상의학회 2022 Cardiovascular Imaging Asia Vol.6 No.1
The incidental findings/artifacts identified on myocardial perfusion imaging (MPI) often warrant further evaluation to rule out possible malignant pathologies. In this case report, we describe an elderly lady who was advised to undergo MPI for cardiac risk stratification prior to a non-cardiac surgery. Her MPI showed a large-sized infarct. In addition, a nodule on the left side of her chest that demonstrated increased isotope uptake was identified incidentally. Further evaluation of this lesion revealed a histopathological diagnosis of intraductal carcinoma of the breast. This case highlights the importance of reporting and investigating all suspicious incidental MPI findings.
Ullah, Ihsan,Khan, Abdul Latif,Ali, Liaqat,Khan, Abdur Rahim,Waqas, Muhammad,Hussain, Javid,Lee, In-Jung,Shin, Jae-Ho Microbiological Society of Korea 2015 The journal of microbiology Vol.53 No.2
<P>The Photorhabdus temperata M1021 secretes toxic compounds that kill their insect hosts by arresting immune responses. Present study was aimed to purify the insecticidal and antimicrobial compound(s) from the culture extract of P. temperata M1021 through bioassay guided fractionation. An ethyl acetate (EtOAc) extract of the P. temperata M1021 exhibited 100% mortality in Galleria mellonella larvae within 72 h. In addition, EtOAc extract and bioactive compound 1 purified form the extract through to column chromatography, showed phenol oxidase inhibition up to 60% and 80% respectively. The analysis of H-1 and C-13 NMR spectra revealed the identity of pure compound as 'benzaldehyde'. The benzaldehyde showed insecticidal activity against G. mellonella in a dose-dependent manner and 100% insect mortality was observed at 108 h after injection of 8 mM benzaldehyde. In a PO inhibition assay, 4, 6, and 8 mM concentrations of benzaldehyde were found to inhibit PO activity about 15%, 42%, and 80% respectively. In addition, nodule formation was significantly (P < 0.05) inhibited by 4, 6, and 8 mM of benzaldehyde as compare to control. Moreover, benzaldehyde was found to have great antioxidant activity and maximum antioxidant activity was 52.9% at 8 mM benzaldehyde as compare to control. Antimicrobial activity was assessed by MIC values ranged from 6 mM 10 mM for bacterial strains and 8 mM to 10 mM for fungal strains. The results suggest that benzaldehyde could be applicable for developing novel insecticide for agriculture use.</P>
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.