A Survey of Software Development Process Models in Software Engineering

Iqbal H. Sarker1,Faisal Faruque,Ujjal Hossen,Atikur Rahman 보안공학연구지원센터 2015 International Journal of Software Engineering and Vol.9 No.11

Software has been a significant part of modern society for a long time. In particular, this paper is concerned with various software development process models. Software process model is a description of the sequence of activities carried out in a software engineering project, and the relative order of these activities. It represents some of the development models namely, waterfall, v-shaped, incremental, RAD, iterative spiral and agile model. Therefore, the main objective of this paper is to represent different models of software development and different aspects of each model to help the developers to select specific model at specific situation depending on customer demand.

Dynamic ID randomization for user privacy in mobile network

Arijet Sarker(Arijet Sarker ),SangHyun Byun(SangHyun Byun),Manohar Raavi(Manohar Raavi ),Jinoh Kim(Jinoh Kim),Jonghyun Kim(Jonghyun Kim),Sang-Yoon Chang(Sang-Yoon Chang) 한국전자통신연구원 2022 ETRI Journal Vol.44 No.6

Mobile and telecommunication networking uses temporary and random identifiers (IDs) to protect user privacy. For greater intelligence and security o the communications between the core network and the mobile user, we design and build a dynamic randomization scheme for the temporary IDs for mobile networking, including 5G and 6G. Our work for ID randomization (ID-RZ) advances the existing state-of-the-art ID re-allocation approach in 5G in the following ways. First, ID-RZ for ID updates is based on computing, as opposed to incurring networking for the re-allocation-based updates, and is designed for lightweight and low-latency mobile systems. Second, ID-RZ changes IDs proactively (as opposed to updating based on explicit networking event triggers) and provides stronger security (by increasing the randomness and frequency of ID updates). We build on the standard cryptographic primitives for security (e.g., hash) and implement our dynamic randomization scheme in the 5G networking protocol to validate its design purposes, which include time efficiency (two to four orders of magnitude quicker than the re-allocation approach) and appropriateness for mobile applications.

Sub-optimal Antenna Selection in the High SNR MIMO Correlated Downlink Channel

Sarker, Md. Abdul Latif,Lee, Moon Ho,Chinnadurai, Sunil Kluwer Academic Publishers 2018 WIRELESS PERSONAL COMMUNICATIONS Vol. No.

Effect of Citrus aurantium var amara on weight change in mice

Sarker, Satyajit Dey,Habibi, Bohlol,Sharifi, Tohid,Asnaashari, Solmaz,Nahar, Lutfun,Delazar, AndAbbas Kyung Hee Oriental Medicine Research Center 2008 Oriental pharmacy and experimental medicine Vol.8 No.3

Citrus aurantium var. amara L., commonly known as 'bitter orange' or 'sour orange', of the family Rutaceae, has traditionally been used in the treatment of various ailments, and it possesses different types of pharmacological properties. As a part of our on-going studies on the plantsfrom the Iranian flora, the extract of C. aurantium var. amara has been studied for its weight lossproperties using the mice model. While the Sep-Pak fraction, 20% methanol (MeOH) in water, of the hydro-methanolic extract of the peels of C. aurantium var. amara fruits, when injectedintraperitoneal (i.p.) at a dose of 10 mg/kg, significantly decreased the level of weight gain of the mice in comparison with control the group (P < 0.01), the Sep-Pak fraction 80% MeOH in water decreased the initial weight of mice by 0.44% in six weeks. The administration of the total extract(10 and 20 mg/kg, i.p.), and the Sep-Pak fractions, 40% and 60% MeOH in water (10 mg/kg, i.p.)did not show any significant change of weight of the test mice. Of the two active fractions, the80% MeOH in water fraction did not show any noticeable adverse effects on mice, and was therefore analysed by reversed-phase preparative high performance liquid chromatography resulting in the isolation and identification of four major components, two coumarins, meranzin hydrate (1) and bergamottin (2), and two flavonoids, xanthomicrol 5,4'-di-methyl ether (tangeritin, 3) and hymenoxin 5,7-di-methyl ether (nobiletin, 4).

Mesoporous metal-organic framework PCN-222(Fe): Promising adsorbent for removal of big anionic and cationic dyes from water

Sarker, Mithun,Shin, Subin,Jeong, Jong Hwa,Jhung, Sung Hwa Elsevier 2019 Chemical engineering journal Vol.371 No.-

<P><B>Abstract</B></P> <P>Dyes are considered as harmful water pollutants because of their high water solubility, wide uses and toxicity. A highly mesoporous metal-organic framework PCN-222(Fe), together with commercial activated carbon (AC), was applied for the removal of both cationic (brilliant green (BG), crystal violet (CV), and methylene blue (MB)) and anionic (acid red 1 (AR 1), acid blue 80 (AB 80) and methyl orange (MO)) dyes from water through adsorption. The adsorptive performances of PCN-222(Fe) are much higher than AC for big dyes (BG, CV, AR 1, and AB 80). On the contrary, PCN-222(Fe) and AC show not very much different performances for the adsorption of small dyes (MB and MO). The maximum adsorption capacity of PCN-222(Fe) for BG, CV, AR 1, and AB 80 was higher than that of any reported adsorbent so far. The remarkably high adsorption capacity of PCN-222(Fe) for BG (854 mg·g<SUP>−1</SUP>), CV (812 mg·g<SUP>−1</SUP>), AR 1 (417 mg·g<SUP>−1</SUP>) and AB 80 (371 mg·g<SUP>−1</SUP>) could be explained by suitable pore size of PCN-222(Fe) together with electrostatic and π-π interactions. Moreover, PCN-222(Fe) could be successfully regenerated and reused for several cycles without any severe decrease in adsorption performance. Therefore, PCN-222(Fe) is suggested as an effective adsorbent for the dyes (especially with big size) removal from water.</P> <P><B>Highlight</B></P> <P> <UL> <LI> PCN-222(Fe) showed the highest adsorption capacity for studied four big dyes. </LI> <LI> PCN-222(Fe) was effective for removal of big dyes, different from that of small dyes. </LI> <LI> Adsorption could be explained by suitable pore size, electrostatic and π-π interactions. </LI> <LI> PCN-222(Fe) could be easily recycled by ethanol washing. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Nitrogen-doped porous carbon from ionic liquid@Al-metal-organic framework: A prominent adsorbent for purification of both aqueous and non-aqueous solutions

Sarker, Mithun,An, Hyung Jun,Yoo, Dong Kyu,Jhung, Sung Hwa Elsevier 2018 Chemical engineering journal Vol.338 No.-

<P><B>Abstract</B></P> <P>Nitrogen-doped porous carbons were derived through direct carbonization of ionic liquid (IL)-loaded Al-based metal-organic frameworks (MOFs, or porous coordination polymers) called AlPCP (IL@AlPCP), where IL was added to increase nitrogen contents of derived carbons. Porous carbons derived from IL@AlPCP and pristine AlPCP (called CDIL@AlPCP and CDAlPCP, respectively) were characterized using various techniques and utilized in liquid-phase adsorptions for both aqueous and non-aqueous media to realize their potential application in water and fuel purifications. The adsorptive performance of CDIL@AlPCP was remarkable for the removal of several pharmaceutical and personal care products from water. For example, the adsorption capacity of CDIL@AlPCP was thus far found to be the highest for para-chloro-meta-xylenol (PCMX) as compared with any reported adsorbent (including CDAlPCP and AC). Moreover, CDIL@AlPCP was also very effective for triclosan and acetaminophen adsorptions. Similarly, the efficiency of CDIL@AlPCP for adsorptive desulfurization and denitrogenation of the model fuel was also noticeable. The remarkable adsorption efficiency of CDIL@AlPCP for both aqueous and non-aqueous phases was explained in terms of mainly H-bonding. The direction of H-bonding can also be defined (for example, PCMX contributed as an H-donor, and ample N and O species of carbon materials contributed as an H-acceptor). Moreover, CDIL@AlPCP can be regenerated through simple ethanol washing and can be reused several times. Therefore, CDIL@AlPCP is recommended as a promising adsorbent for purification of both aqueous and non-aqueous solutions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nitrogen doped mesoporous carbon was obtained by pyrolysis of ionic liquid@AlPCP. </LI> <LI> The mesoporous carbon showed remarkable adsorption for water and fuel purification. </LI> <LI> H-bonding was a probable mechanism for various adsorptive purifications. </LI> <LI> The adsorbates and carbons behaved mainly as H-donor and -acceptor, respectively. </LI> <LI> CDIL@AlCP was a remarkable adsorbent based on adsorption capacity/reusability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

“We'll starve to death”: The consequences of COVID‐19 over the lives of poor people with disabilities in rural Nepal

Sarker Debashis,Shrestha Sanjana,Tamang Santosh Kumar Baidhya 한국사회복지학회 2022 Asian Social Work and Policy Review Vol.16 No.2

There is no doubt that the sudden outbreak of COVID-19 negatively impacted billions of people worldwide, and among them, people with disabilities became most susceptible. However, little is known about the impact of COVID-19 on the lives of people with disabilities in Nepal. Using empirical data from semi-structured in-depth interviews with people with disabilities, disability specialist, and community leaders, this study discusses the lived experiences of people with disabilities who have been affected by COVID-19 in Nepal. This study revealed that the outbreak of COVID-19 impacted people with disabilities by worsening their vulnerability. In particular, the majority of people with disabilities became further isolated, were disconnected from existing services such as access to information, education, and health care and many lost their income opportunities. Findings from this study further show that this pandemic affected the rights of people with disabilities guided by the United Nations Convention on the Rights of Persons with Disabilities (UNCRPD). Immediate financial and non-financial support for people with disabilities from government and other stakeholders, such as non-governmental organizations (NGOs), is needed, indicating the need for policymakers to reassess policies to ensure that they adequately protect the rights of people with disabilities.

Prognostic Implications of the SUVmax of Primary Tumors and Metastatic Lymph Node Measured by 18F-FDG PET in Patients With Uterine Cervical Cancer: A Meta-analysis

Sarker, Azmal,Im, Hyung-Jun,Cheon, Gi Jeong,Chung, Hyun Hoon,Kang, Keon Wook,Chung, June-Key,Kim, E. Edmund,Lee, Dong Soo Wolters Kluwer Health, Inc. All rights reserved. 2016 Clinical nuclear medicine Vol.41 No.1

<P>Purpose We conducted a meta-analysis to evaluate the prognostic value of the SUVmax measured in pretreatment primary lesions and metastatic lymph nodes (LNs) on F-18-FDG PET scans in patients with uterine cervical cancer. Methods A systematic search of EMBASE and MEDLINE was performed using the keywords positron emission tomography (PET), uterine cervical cancer, and prognosis. Event-free survival and overall survival were evaluated as outcomes. The impact of SUVmax on survival was measured by the effect size of the hazard ratio (HR). Results Fourteen eligible studies including 1150 patients were analyzed. Patients with a high primary SUVmax showed a worse prognosis, with an HR of 2.66 (95% confidence interval [CI], 1.90-3.74; P < 0.00001) for adverse events and an HR of 2.45 (95% CI, 1.74-3.45; P < 0.00001) for death. Patients with high SUVmax in metastatic pelvic LN (PLN) showed a worse prognosis, with an HR of 2.92 (95% CI, 1.94-4.39; P < 0.00001) for adverse events and an HR of 2.66 (95% CI, 1.60-4.43; P = 0.0002) for SUVmax in PLN for death. In addition, high SUVmax in metastatic para-aortic LN was associated with a worse prognosis, with an HR of 4.41 (95% CI, 2.32-8.38; P < 0.00001) for death. Conclusions Patients with uterine cervical cancer and a high SUVmax primary lesion, PLN, or para-aortic LN are at higher risk of adverse events or death.</P>

Electrochemical impedance spectroscopy of dye-sensitized solar cells with different electrode geometry

Sarker, S.,Seo, H.W.,Seo, D.W.,Kim, D.M. Korean Society of Industrial and Engineering Chemi 2017 Journal of industrial and engineering chemistry Vol.45 No.-

<P>Here, we report on the characterization of dye-sensitized solar cells (DSSCs) with different electrode geometry by analyzing their electrochemical impedance spectra along with current-voltage curves. The analysis shows a strong correlation between the photovoltaic performance and the series resistance (R-s) of the DSSCs. Among the component resistances of R-s, the Ohmic resistance (R-os) is the largest that depends greatly on the geometry of the active area and the sheet resistance of the substrate. Other series resistive elements do not affect the R-s significantly. The study should help upscaling small unit DSSCs to large modules without compromising their photovoltaic performance. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>

Adsorptive removal of herbicides from water over nitrogen-doped carbon obtained from ionic liquid@ZIF-8

Sarker, Mithun,Ahmed, Imteaz,Jhung, Sung Hwa Elsevier 2017 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.323 No.-

<P><B>Abstract</B></P> <P>Highly porous nitrogen-doped carbon was obtained from the pyrolysis of ionic liquid (IL)-incorporated metal-organic frameworks (MOF, named ZIF-8) (IL@ZIF-8). IL@ZIF-8-derived carbon (IMDC), MOF-derived carbon (MDC, obtained from pure ZIF-8), and commercial activated carbon (AC) were applied in the removal of the toxic herbicides diuron [3-(3,4 dichlorophenyl)-1,1-dimethylurea), DUR] and 2,4-dichlorophenoxyacetic acid (2,4-D) from water. The adsorption capacity of IMDC was found to be the highest for DUR and was also remarkable for 2,4-D compared with any reported adsorbent, including MDC and AC. The maximum adsorption capacities of IMDC for DUR and 2,4-D were 284 and 448mg·g<SUP>−1</SUP>, respectively. The remarkable adsorption efficiency of IMDC is probably due to the abundant number of active sites present on its surface because of nitrogen doping and its relatively high porosity, even though it is less porous than MDC. To determine a plausible adsorption mechanism, not only detailed characterizations of the adsorbents were performed but also adsorptions across a wide pH range were carried out. Hydrogen bonding (IMDC: H-donor; adsorbates: H-acceptor) with hydrophobic and π-π interactions was suggested as a plausible mechanism for adsorption. Moreover, IMDC can be regenerated by a simple solvent treatment and used for successive adsorptive removal of the studied adsorbates. Therefore, IMDC is recommended as a potent adsorbent for the removal of herbicides such as DUR and 2,4-D from water.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nitrogen-doped carbon (IMDC) was obtained by pyrolysis of ionic liquid@ZIF-8. </LI> <LI> Adsorptive removal of herbicides was done with the obtained IMDC. </LI> <LI> IMDC was most effective adsorbent for diuron and competitive for 2,4-D; and reusable. </LI> <LI> The adsorption can be explained with H-bonding (IMDC/herbicide: H-donor/acceptor). </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>