Quality Evaluation of Mackerel Fillets Stored under Different Conditions by Hyperspectral Imaging Analysis

Azfar Ismail,류지원,임동균,김기석,김성수,이학주,조철훈 한국축산식품학회 2023 한국축산식품학회지 Vol.43 No.5

This study was designed to compare the quality changes in mackerel fillets stored under different conditions by using hyperspectral imaging (HSI) techniques. Fillets packaged in vacuum were stored for six days under five different conditions: refrigerated at 4℃ (R group); iced at 5±3℃ (I group); kept at an ambient of 17±2℃ (A group); frozen at –18℃ for 24 h and thawed in a refrigerator at 4℃ for 5 h on the sampling day (FTR group); FTR thawed in tap water instead of thawing in a refrigerator (FTW group). The FTR group had the lowest total bacterial count, drip loss, 2-thiobarbituric acid reactive substances, volatile basic nitrogen, and texture profile analysis values among groups during the entire storage period (p<0.05). Scanning electron microscopy revealed that the FTR group had less damage, while the other groups had shrunken muscle tissues. HSI integrated with the partial least squares model yielded reliable and efficient results, with high R2cv values, for several quality parameters of the mackerel fillets. Overall, the FTR group, involving freezing and thawing in a refrigerator, appears to be the most favorable option for maintaining the quality of mackerel fillets, which could be practically implemented in the industry. HSI is a suitable and effective technique for determining the quality of mackerel fillets stored under different conditions.

Impact of multi-professional simulation-based training on perceptions of safety and preparedness among health workers caring for coronavirus disease 2019 patients in Pakistan

Jamal Azfar Khan,Muhammad Rizwan Bashir Kiani 한국보건의료인국가시험원 2020 보건의료교육평가 Vol.17 No.-

This study aimed to evaluate perceptions of safety and preparedness among health workers caring for coronavirus disease 2019(COVID-19) patients before and after a multi-professional simulation-based course in Pakistan. Health workers’ perceptions of preparedness, safety, and their willingness to care for COVID-19 patients were measured before and after they attended a simulation-basedtraining course to prepare them to care for COVID-19 patients at Combined Military Hospital Landi Kotal Cantt, from March 1 toApril 30, 2020. The participants’ perceived level of safety and preparedness to care for COVID-19 patients before the simulation-basedcourse was low, but increased after completing it (P<0.05). They felt confident and were significantly more willing to care for patientswith COVID-19 or other infections requiring strict isolation. Simulation-based training is an effective tool to improve perceptions ofrisk and readiness to deal with COVID-19 among medical and non-medical health workers in Pakistan.

Role of Whole-Spine Screening Magnetic Resonance Imaging Using Short Tau Inversion Recovery or Fat-Suppressed T2 Fast Spin Echo Sequences for Detecting Noncontiguous Multiple-Level Spinal Tuberculosis

Mohammed Azfar Siddiqui,Sara Sartaj,Syed Wajahat A. Rizvi,Mohammad Jesan Khan,Iraj Alam Khan 대한척추외과학회 2018 Asian Spine Journal Vol.12 No.4

Study Design: Retrospective review. Purpose: The purpose of the present study was to evaluate the role of whole-spine screening using short tau inversion recovery (STIR) or fat-suppressed T2W fast spin echo (FSE) sequences in patients with spinal tuberculosis (TB). Overview of Literature: The identification of noncontiguous multiple-level spinal tuberculosis (NMLST), symptomatic or not, is important because of its management implications. Most centers do not perform routine whole-spine magnetic resonance imaging (MRI), and the reported incidence of NMLST varies from 1.1% to 74.1%. Methods: We completed a retrospective review of clinical and radiographic data of 365 patients with spinal TB who presented at Jawaharlal Nehru Medical College, Aligarh over 5 years. The final analysis included 187 patients who full filled the inclusion criteria, consisting of availability of whole-spine MRI and confirmation of vertebral TB. Diagnosis of NMLST was considered when other vertebral lesions were identified in addition to the primary vertebral disease, with the lesions separated by at least one normal spinal segment. The primary site was defined as the site for which the patient had been referred for MRI. Results: NMLST was identified in 47 of 187 patients investigated using whole-spine MRI. The incidence was 25.1%, which was higher than that in earlier reports where whole-spine MRI was not routinely performed. The lumbar spine was involved in 37 patients, thoracic spine in 25, cervical spine in 16, and sacrum in five patients. Combined lumbar spine and thoracic spine involvement was observed in 19 patients. Thirteen patients had lumbar and cervical spine involvement, nine had thoracic and cervical spine involvement, four had combined lumbar and sacral spine involvement, and the remaining two had thoracic and sacral spine involvement. Conclusions: Tubercular spondylitis may affect the spine at multiple noncontiguous sites with the majority of additional affected sites remaining asymptomatic. Routine whole-spine MRI using all recommended sequences is not cost-effective and hence not feasible. Therefore, we recommend whole-spine screening using STIR or fat-suppressed T2W FSE sequences in all patients with suspected spinal TB. This screening is cost-effective compared with full-protocol MRI and detects additional cases of NMLST over conventional practice.

An Improved Congestion Detection Method Based on Energy Consumption in Wireless Sensor Network

Dixiao Mu(무디샤오),Muhammad Azfar Yaqub(무하메드 아즈파르 야쿱),Dongkyun Kim(김동균) 한국통신학회 2016 한국통신학회 학술대회논문집 Vol.2016 No.1

Effect of Temperature Abuse on Quality and Metabolites of Frozen/Thawed Beef Loins

권정아,임동균,김현준,Azfar Ismail,김성수,이학주,조철훈 한국축산식품학회 2022 한국축산식품학회지 Vol.42 No.2

The objective of this study was to examine the effect of temperature abuse prior to cold storage on changes in quality and metabolites of frozen/thawed beef loin. The aerobic packaged samples were assigned to three groups: refrigeration (4℃) (CR); freezing (–18℃ for 6 d) and thawing (20±1℃ for 1 d), followed by refrigeration (4℃) (FT); temperature abuse (20℃ for 6 h) prior to freezing (–18℃ for 6 d) and thawing (20±1℃ for 1 d), followed by refrigeration (4℃) (AFT). FT and AFT resulted in higher volatile basic nitrogen (VBN) values than CR (p<0.05), and these values rapidly increased in the final 15 d. Cooking loss decreased significantly with an increase in the storage period (p<0.05). In addition, cooking loss was lower in the FT and AFT groups than in the CR owing to water loss after storage (p<0.05). A scanning electron microscope (SEM) revealed that frozen/thawed beef samples were influenced by temperature abuse in the structure of the fiber at 15 d. Metabolomic analysis showed differences among CR, FT, and AFT from partial least square discriminant analysis (PLS-DA) based on proton nuclear magnetic resonance (1H NMR) profiling. The treatments differed slightly, with higher FT than AFT values in several metabolites (phenylalanine, isoleucine, valine, betaine, and tyrosine). Overall, temperature abuse prior to freezing and during thawing of beef loin resulted in accelerated quality changes.

Evaluation of the physicochemical, metabolomic, and sensory characteristics of Chikso and Hanwoo beef during wet aging

Dongheon Lee,Hye-Jin Kim,Azfar Ismail,Sung-Su Kim,Dong-Gyun Yim,Cheorun Jo Asian Australasian Association of Animal Productio 2023 Animal Bioscience Vol.36 No.7

Objective: This study aimed to evaluate the physicochemical, metabolomic, and sensory qualities of Chikso and Hanwoo beef during 28 days of wet aging. Methods: Rump and loins from Hanwoo and Chikso were obtained and wet-aged for 28 days at 4℃. The samples were collected at 7-day interval (n = 3 for each period). Physicochemical qualities including pH, meat color, shear force value, and myofibrillar fragmentation index, metabolomic profiles, and sensory attributes (volatile organic compounds and relative taste intensities) were measured. Results: Chikso showed a significantly higher shear force value than Hanwoo on day 0; however, no differences between breeds were found after day 14, regardless of the cuts. Overall, Chikso had more abundant metabolites than Hanwoo, especially L-carnitine and tyrosine. Among the volatiles, the ketone ratio was higher in the Chikso rump than the Hanwoo rump; however, Chikso had fewer alcohols and aldehydes than Hanwoo. Chikso rump showed higher taste intensities than the Hanwoo rump on day 0, and sourness decreased in Chikso, but increased in the Hanwoo rump on day 14. Wet aging for 14 days intensified the taste of Chikso loin but reduced the umami intensity of Hanwoo loin. Conclusion: Chikso had different metabolomic and sensory characteristics compared to Hanwoo cattle, and 14 days of wet aging could improve its tenderness and flavor traits.

DIFS: Distributed Interest Forwarder Selection in Vehicular Named Data Networks

Ahmed, Syed Hassan,Bouk, Safdar Hussain,Yaqub, Muhammad Azfar,Kim, Dongkyun,Song, Houbing IEEE 2018 IEEE transactions on intelligent transportation sy Vol.19 No.9

<P>In this paper, we propose a distributed interest forwarder selection (DIFS) scheme that mitigates the interest broadcast storm in vehicular named data networks. In DIFS, a vehicle sends an interest packet piggybacking its location, distance to the neighbors, and speed. In this case, the immediate neighbors do not have the requested content and rank themselves to be an eligible interest forwarder by using multiple attributes. Additionally, every intermediate vehicle uses a digital map to be selected as forwarders in both (forward and backward) directions of the consumer. Simulations show that DIFS satisfies more interest packets with less delay as compared with the recent forwarding solutions.</P>

CODIE: Controlled Data and Interest Evaluation in Vehicular Named Data Networks

Ahmed, Syed Hassan,Bouk, Safdar Hussain,Yaqub, Muhammad Azfar,Kim, Dongkyun,Song, Houbing,Lloret, Jaime IEEE 2016 IEEE Transactions on Vehicular Technology VT Vol.65 No.6

<P>Recently, named data networking (NDN) has been proposed as a promising architecture for future Internet technologies. NDN is an extension to the content-centric network (CCN) and is expected to support various applications in vehicular communications [ vehicular NDN (VNDN)]. VNDN basically relies on naming the content rather than using end-to-end device names. In VNDN, a vehicle broadcasts an 'Interest' packet for the required 'content,' regardless of end-to-end connectivity with servers or other vehicles and known as a 'consumer.' In response, a vehicle with the content replies to the Interest packet with a 'Data' packet and named as a 'provider.' However, the simple VNDN architecture faces several challenges such as consumer/provider mobility and Interest/Data packet(s) forwarding. In VNDN, for the most part, the Data packet is sent along the reverse path of the related Interest packet. However, there is no extensive simulated reference available in the literature to support this argument. In this paper, therefore, we first analyze the propagation behavior of Interest and Data packets in the vehicular ad hoc network (VANET) environment through extensive simulations. Second, we propose the 'CODIE' scheme to control the Data flooding/broadcast storm in the naive VNDN. The main idea is to allow the consumer vehicle to start hop counter in Interest packet. Upon receiving this Interest by any potential provider, a data dissemination limit (DDL) value stores the number of hops and a data packet needs to travel back. Simulation results show that CODIE forwards fewer copies of data packets processed (CDPP) while achieving similar interest satisfaction rate (ISR), as compared with the naive VNDN. In addition, we also found that CODIE also minimizes the overall interest satisfaction delay (ISD), respectively.</P>

Enhanced TDMA based MAC Protocol for Adaptive Data Control in Wireless Sensor Networks

Ahmad Naseem Alvi,Safdar Hussain Bouk,Syed Hassan Ahmed,Muhammad Azfar Yaqub,Nadeem Javaid,김동균 한국통신학회 2015 Journal of communications and networks Vol.17 No.3

In this paper, we propose an adaptive time division multiple access based medium access control (MAC) protocol, called bitmap-assisted shortest job first based MAC (BS-MAC), for hierarchical wireless sensor networks (WSNs). The main contribution of BS-MAC is that: (a) It uses small size time slots. (b) The number of those time slots is more than the number of member nodes. (c) Shortest job first (SJF) algorithm to schedule time slots. (d) Short node address (1 byte) to identify members nodes. First two contributions of BS-MAC handle adaptive traffic loads of all members in an efficientmanner. The SJF algorithm reduces node’s job completion time and to minimize the average packet delay of nodes. The short node address reduces the control overhead and makes the proposed scheme an energy efficient. The simulation results verify that the proposed BS-MAC transmitsmore data with less delay and energy consumption compared to the existing MAC protocols.

Effect of Temperature Abuse on Quality and Metabolites of Frozen/Thawed Beef Loins

Jeong A Kwon,Dong-Gyun Yim,Hyun-Jun Kim,Azfar Ismail,Sung-Su Kim,Hag Ju Lee,Cheorun Jo 한국축산식품학회 2022 한국축산식품학회지 Vol.42 No.1

The objective of this study was to examine the effect of temperature abuse prior to cold storage on changes in quality and metabolites of frozen/thawed beef loin. The aerobic packaged samples were assigned to three groups: refrigeration (4℃) (CR); freezing (–18℃ for 6 d) and thawing (20±1℃ for 1 d), followed by refrigeration (4℃) (FT); temperature abuse (20℃ for 6 h) prior to freezing (–18℃ for 6 d) and thawing (20±1℃ for 1 d), followed by refrigeration (4℃) (AFT). FT and AFT resulted in higher volatile basic nitrogen (VBN) values than CR (p<0.05), and these values rapidly increased in the final 15 d. Cooking loss decreased significantly with an increase in the storage period (p<0.05). In addition, cooking loss was lower in the FT and AFT groups than in the CR owing to water loss after storage (p<0.05). A scanning electron microscope (SEM) revealed that frozen/thawed beef samples were influenced by temperature abuse in the structure of the fiber at 15 d. Metabolomic analysis showed differences among CR, FT, and AFT from partial least square discriminant analysis (PLS-DA) based on proton nuclear magnetic resonance (1H NMR) profiling. The treatments differed slightly, with higher FT than AFT values in several metabolites (phenylalanine, isoleucine, valine, betaine, and tyrosine). Overall, temperature abuse prior to freezing and during thawing of beef loin resulted in accelerated quality changes.