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      • KCI등재

        A symmetric benzoselenadiazole based D–A–D small molecule for solution processed bulk-heterojunction organic solar cells

        Abdullah,M. Shaheer Akhtar,Eun-Bi Kim,Lamiaa Fijahi,Hyung-Shik Shin,Sadia Ameen 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-

        Benzoselenadiazole as the central acceptor unit with terminal donor unit of n-hexylbithiophene waschosen to design the symmetric donor-acceptor-donor (D–A–D) configuration based small organicchromophore, 4,7-bis(50-hexyl-[2,20-bithiophen]-5-yl)benzo[c][1,2,5]selenadiazole, RTh-BSe-ThR, forthe fabrication of solution-processed bulk-heterojunction organic solar cells (BHJ-OSCs). RTh-BSe-ThRchromophore showed assuring solubility in common organic solvents and exhibited wider absorption inthe visible region with an optical band gap (Egopt) of1.87 eV. Benzoselenadiazole unit with two nhexylbithiopheneunits exhibited an excellent electrochemical behavior with the highest occupiedmolecular orbital (HOMO) of5.38 eV and the lowest unoccupied molecular orbital (LUMO) of3.51 eV. The fabricated BHJ-OSCs with RTh-BSe-ThR:PC61BM (1:3, w/w) blend thinfilm displayed a powerconversion efficiency (PCE) of3.46% and a high value of short circuit current density (JSC) of11.20 mA/cm2. The enhancement in the photovoltaic parameters might be attributed to the significantimprovements in the interfacial area of bulk heterojunction which might enhance the light harvestingproperty and the shunt resistance of the blend thinfilms.

      • KCI등재후보

        Analysis of the Growth Characteristics of Cardiac Cells According to Mechanical Properties of Substrates Using the Simplified Measurement Technique of Tracker

        ( Abdullah ),( Pooja P. Kanade ),( Nomin-erdene Oyunbaatar ),( Yun-jin Jeong ),( Dong-su Kim ),( Dong-weon Lee ) 한국센서학회 2022 센서학회지 Vol.31 No.1

        To date, various techniques have been utilized to assess the contractility of cardiomyocytes and their response to drug-induced toxicity. However, these techniques are either invasive or involve complex fabrication methods and expertise. Here, we introduce the use of video-based analysis software to track the motion of cardiomyocytes and assess their contractility. The software, called “Tracker”, is freely available and this is the first attempt at using it for cardiac contractility measurement. We used the software to measure the contractile properties of cells cultured on a rigid substrate and two flexible polydimethylsiloxane (PDMS) substrates having different elastic moduli day-wise up to eight days. Contractility was found to be highest in the most flexible substrate. Subsequently, the cardiotoxicity response of the cells on three different substrates was analyzed with verapamil. It was observed that the cells on rigid substrate were primarily affected by drug-induced toxicity, while the drug had a lesser impact on cells on the more flexible PDMS substrate. Evidently, the flexible substrate aided the maturation of cells and had lower drug toxicity, while the cells on PS could not fully mature. The assessment of cardiomyocytes using “Tracker” proved to be simple and reliable.

      • SCIESCOPUS

        Complete collapse test of reinforced concrete columns

        Abdullah, Abdullah,Takiguchi, Katsuki Techno-Press 2001 Structural Engineering and Mechanics, An Int'l Jou Vol.12 No.2

        In this paper, experimental investigation into the behavior of reinforced concrete (RC) columns tested under large lateral displacement with four different types of loading arrangements is presented. Each loading arrangement has a different system for controlling the consistency of the loading condition. One of the loading arrangements used three units of link mechanism to control the parallelism of the top and bottom stub of column during testing, and the remaining employed eight hydraulic jacks for the same purpose. The loading systems condition used in this investigation were similar to the actual case in a moment-resisting frame where the tested column was displaced in a double curvature. Ten model column specimens, divided into four series were prepared. Two columns were tested monotonically until collapse, and unless failure took place at an earlier stage of loading, the remaining eight columns were tested under cyclic loading. Test results indicated that the proposed system to keep the top and bottom stubs parallel during testing performed well.

      • SCIESCOPUSKCI등재

        Growth Performance, Carcass and Meat Characteristics of Black Goat Kids Fed Sesame Hulls and Prosopis juliflora Pods

        Abdullah, Abdullah Y.,Obeidat, Belal S.,Muwalla, Marwan M.,Matarneh, Sulaiman K.,Ishmais, Majdi A. Abu Asian Australasian Association of Animal Productio 2011 Animal Bioscience Vol.24 No.9

        Finding alternative feeds, such as sesame hulls and Prosopis juliflora species can attenuate difficulties of feed shortage and reduce the cost of animal feed in arid and semi-arid countries. Thirty-two Black male kids with similar initial weights (BW = $16.7{\pm}0.80\;kg$) and $120{\pm}5\;d$ of age, were used to evaluate the effect of replacing barley grains and soybean meal with Prosopis juliflora pods (PJP) and sesame hulls (SH) on growth performance, digestibility and carcass and meat characteristics. Kids were equally divided into four dietary treatment groups for an 84-d fattening period. Treatment diets had similar crude protein (CP) and metabolizable energy (ME). The treatment groups were: (T1) no PJP nor SH, (T2) 10% PJP and 20% SH, (T3) 15% PJP and 15% SH, and (T4) 20% PJP and 10% SH. A tendency was detected (p<0.08) for dry matter (DM), crude protein (CP), organic matter (OM) and neutral detergent fiber (NDF) intakes that were greater for T2 than T3 and T4 while T1 was not different from all other treatment groups. Ether extract (EE) intake was the greatest (p<0.05) for T2 and the lowest for T1. Acid detergent fiber (ADF) intake was greater (p<0.05) for T2 than T1 while T3 and T4 were intermediate. Final live weight, average daily gain (ADG) and feed conversion ratio (FCR) were comparable among different treatment groups. Digestibility of DM, OM, CP, NDF and ADF were similar among all treatment groups, however, EE digestibility was the lowest (p<0.05) for T1 when compared to other treatments. In addition, nitrogen intake, nitrogen in urine and retained and retention percentages were similar among all treatment groups. However, N loss in feces was higher (p<0.05) for T2 than T3 and T4 while T1 was intermediate. No differences were observed among treatment groups with respect to fasting live weight, hot and cold carcass weights, dressing-out percentages, mesenteric fat, visceral organs, carcass cuts percentages and carcass linear dimensions. No differences were also observed for dissected loin, leg, rack and shoulder tissues except in the total bone % for loin cuts and in the meat to bone ratio for rack cuts. T3 has the greatest total bone % and the lowest meat to bone ratio when compared to all other treatment groups. No differences were observed between treatment groups in all quality characteristics of the longissimus muscle. The present study demonstrates the potential of using PJP and SH for growing kids without adverse effects on growth performance, carcass characteristics and meat quality.

      • SCIESCOPUSKCI등재

        Effects of Strain on Performance, and Age at Slaughter and Duration of Post-chilling Aging on Meat Quality Traits of Broiler

        Abdullah, Abdullah Y.,Muwalla, Marwan M.,Maharmeh, Haitham O.,Matarneh, Sulaiman K.,Ishmais, Majdi A. Abu Asian Australasian Association of Animal Productio 2010 Animal Bioscience Vol.23 No.12

        This study was conducted to investigate the effects of strain on broiler performance, and age at slaughter and postchilling (PC) aging time on meat quality traits. A total of 500 one-day-old chicks (250 Hubbard classic and 250 Lohman) were reared under commercial conditions. Half of the broiler birds from each strain were slaughtered at 32 days and the other half at 42 days old. At each processing day, 168 carcasses were randomly selected (84 Hubbard and 84 Lohman) and divided into groups of 28 carcasses within each strain, and aged for 0, 4 and 24 h after chilling. Average weekly body weight was comparable between strains. Feed conversion ratio was higher (p<0.05) for the Hubbard strain during the second and third week of age. Initial carcass pH was significantly (p<0.05) affected by age where younger birds (32-d-old) had lower pH values than older (41-d-old) birds. Breast temperature was higher (p<0.001) for Lohman than Hubbard at 0, 2 and 4 h of PC. Younger birds had a lower breast temperature (p<0.001) at all measured times of PC. Thaw loss, cook loss and water holding capacity were not significantly affected by strain, age or aging time. Lohman strain had more tender meat (p<0.05) than Hubbard strain, and tenderness was improved with the increase of broiler age and aging time. Meats from Hubbard were lighter and less red than those from Lohman strain where younger birds had darker color. In conclusion, strain, age at slaughter and PC aging duration are critical to breast meat quality characteristics, and 4 h of aging are required before deboning in order to obtain more tender fillets.

      • KCI등재

        Serum Levels of High Sensitivity C-reactive Protein in Drug-naïve First-episode Psychosis and Acute Exacerbation of Schizophrenia

        Abdullah Bolu,Mehmet Sinan Aydın,Abdullah Akgün,Ali Coşkun,Beyazıt Garip,Taner Öznur,Cemil Çelik,Özcan Uzun 대한정신약물학회 2019 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.17 No.2

        Objective: Findings about inflammatory processes in schizophrenia are increasing day by day. Inflammatory processes in schizophrenia are associated with both its etiology and clinical symptoms. Serum high-sensitivity C-reactive protein (hsCRP) is also one of these inflammatory processes. Particularly, it is thought to be closely related to clinical findings of patients with schizophrenia. Methods: In this study, the relationship between clinical findings of hsCRP levels of patients with drug-naïve first-episode psychosis (FEP) and patients with schizophrenia in acute exacerbation phase is investigated. Clinical findings, psychometric properties (the Scale for the Assessment of Positive Symptoms, the Scale for the Assessment of Negative Symptoms, Brief Psychiatric Rating Scale), and hsCRP levels of patients were compared. Results: Forty-eight patients with FEP, 74 patients with schizophrenia in acute exacerbation phase and 54 healthy controlled volunteers are included in the study. The most substantial finding in the study is that there is a positive correlation between hsCRP levels and severity of positive symptoms of both patient groups, with FEP and with schizophrenia. The second most substantial finding is there is no significant difference between patients with FEP and schizophrenia, in terms of hsCRP. Conclusion: The relationship between hsCRP and positive symptom severity in two groups of patients supports the inflammatory hypothesis in the etiopathogenesis of schizophrenia. This finding is supportive of close relation between inflammatory processes and clinical findings of patient with schizophrenia.

      • SCOPUS

        Stock Market Reaction to the COVID-19 Pandemic: Evidence from Kuwait

        Abdullah AL-MUTAIRI,Abdullah AL FALAH,Hani NASER,Kamal NASER 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.3

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        The purpose of this study is to examine the Kuwaiti Stock Exchange’s (KDE) response to the COVID-19 pandemic and the precautions taken by Kuwaiti authorities to protect their citizens and other residents. To achieve this objective, daily data from four different indexes published by the Kuwait Stock Exchange (KSE) for the period between 24 February and 30 June 2020, as well as daily data on the number of people infected with COVID-19, the daily number of recovered people, the daily number of deaths, lockdown days, and days the country was under curfew. The findings show a significant positive association between the daily recovery of persons infected by COVID-19 and all indexes published by the KSE except for the Boursa Kuwait Main Market 50, where the association was positive but insignificant. A negative and significant association was also found between the closure of the country and each of the four indexes. Although the curfew imposed by the Kuwaiti authorities at an early stage of the pandemic appeared to have a negative effect on the four indexes, the level of association was statistically significant only in the cases of the Main Market index and Boursa Kuwait Main Market 50 index.

      • The Decision-Making Journey of Malaysian Women with Early Breast Cancer: A Qualitative Study

        Abdullah, Adina,Abdullah, Khatijah Lim,Yip, Cheng Har,Teo, Soo-Hwang,Taib, Nur Aishah,Ng, Chirk Jenn Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.12

        Background: The survival outcomes for women presenting with early breast cancer are influenced by treatment decisions. In Malaysia, survival outcome is generally poor due to late presentation. Of those who present early, many refuse treatment for complementary therapy. Objective: This study aimed to explore the decision making experiences of women with early breast cancer. Materials and Methods: A qualitative study using individual in-depth interviews was conducted to capture the decision making process of women with early breast cancer in Malaysia. We used purposive sampling to recruit women yet to undergo surgical treatment. A total of eight participants consented and were interviewed using a semi-structured interview guide. These women were recruited from a period of one week after they were informed of their diagnoses. A topic guide, based on the Ottawa decision support framework (ODSF), was used to facilitate the interviews, which were audio recorded, transcribed and analysed using a thematic approach. Results: We identified four phases in the decision-making process of women with early breast cancer: discovery (pre-diagnosis); confirmatory ('receiving bad news'); deliberation; and decision (making a decision). These phases ranged from when women first discovered abnormalities in their breasts to them making final surgical treatment decisions. Information was vital in guiding these women. Support from family members, friends, healthcare professionals as well as survivors also has an influencing role. However, the final say on treatment decision was from themselves. Conclusions: The treatment decision for women with early breast cancer in Malaysia is a result of information they gather on their decision making journey. This journey starts with diagnosis. The women's spouses, friends, family members and healthcare professionals play different roles as information providers and supporters at different stages of treatment decisions. However, the final treatment decision is influenced mainly by women's own experiences, knowledge and understanding.

      • Wavelet Packet Transform Based Features for Malaysian Speaker and Accent Recognition using Speech Signals

        ( Rokiah Abdullah ),( M. Hariharan ),( Vikneswaran Vijean ),( Farah Nazlia Che Kassim ),( Zulkapli Abdullah ) 한국감성과학회 2017 한국감성과학회 국제학술대회(ICES) Vol.2017 No.-

        Malaysia mainly consists of people from three ethnic groups (Malay, Chinese and Indian) and the official and national language of Malaysia is Malay. Malaysian standard English is a form English used and spoken in in Malaysia. Due to the heavy influence of Malay and lack of use of English, Malaysians English accent of Malaysian is not similar to standard English language. So, it is difficult use most commercially available speaker and accent recognition system for Malaysian speaker and accent recognition. Therefore, it is necessary to develop a system to recognize individuals and their accents using the spoken utterances (Malaysian English). Spoken utterances (English digits (0~9) and Malay words) are recorded using the subjects including three ethnic groups (Malay, Chinese and Indian) of Malaysia. Database of speaker and accent are developed using. In this paper, wavelet packet transform based feature extraction method is proposed to extract salient features from the recorded spoken utterances. Support vector machine (SVM) is used to recognize individuals and their accent. The highest accuracy of 92.90% was obtained for speaker identification and 94.89% for accent identification using Malay words whereas the highest accuracy of 91.18% was obtained for speaker identification and 94.17% for accent recognition using Malay digit.

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