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.

Testicular and epididymal ultrasonography for the assessment of semen quality in the indigenous ram

Sarker Suchana,Zohara Begum Fatema,Azizunnesa,Islam Md. Faruk,Bari Farida Yeasmin 사단법인 한국동물생명공학회 2021 한국동물생명공학회지 Vol.36 No.4

The aims of this study were to measure the ultrasonographic biometry of genitalia of the indigenous rams and observe the relationship of biometry on semen parameters. The epididymal volume was significantly reduced (p < 0.01) after semen collection compared with before collection for both left and right part in all rams. The cumulative results showed that although there was no significant difference in length, width and volume of epididymis between before and after semen collection, however the values were lower after collection. The epididymal length was significantly correlated with epididymal volume (p < 0.01), semen motility (p < 0.05) and semen morphology (p < 0.01). Epididymal width was only significantly correlated with epididymal volume (p < 0.01) not with the semen parameters. Epididymal volume had a significant correlation only with semen morphology (p < 0.01).The scrotal circumference had the significant correlation with semen density, mass activity, concentration and motility (p < 0.01). The epididymis had the similar or slightly increased echogenicity as compared to the normal testis. During whole study, some white spots were found on testis which did not affect the semen quantity and quality. Significant variation was observed only for semen concentration and motility among the rams (p < 0.05). The overall normal morphology was 90.5 ± 4.6% with highest percentage of coiled tail abnormalities.

Plasmablastic lymphoma exclusively involving bones mimicking osteosarcoma in an immunocompetent patient : A case report

Sarker, Azmal Kabir,Im, Hyung-Jun,Paeng, Jin Chul,Cheon, Gi Jeong,Kang, Keon Wook,Chung, June-Key,Lee, Dong Soo Williams & Wilkins Co 2016 Medicine Vol.95 No.28

<P><B>Abstract</B></P><P><B>Background:</B></P><P>It has been known that plasmablastic lymphoma (PBL) is a neoplasm of immunocompromised patients occurring in soft tissue of oral cavity or in the vicinity whereas bone is an unlikely site to harbor PBL. However, its occurrence is increasingly being reported in immunocompetent individuals in either osseous or extra-oral sites. To our best knowledge, F-18 FDG PET/CT findings of PBL involving bones in an immunocompetent patient have not been reported, yet .</P><P><B>Case summary:</B></P><P>We report a case of PBL involving multiple bones in an immunocompetent patient. Features of different imaging modalities including F-18 Fluoro-deoxy glucose (FDG) positron emission tomography/computed tomography (PET/CT) were correlated well as findings of osteosarcoma in mandible with metastatic lesions. However, the histopathology and immunohistochemistry (IHC) of bone tissues from 2 separate biopsy sites revealed features of PBL.</P><P><B>Conclusion:</B></P><P>awareness to F-18 FDG PET/CT findings of PBL involving bones in an immunocompetent patient may prevent misdiagnosis.</P>

Adsorptive removal of anti-inflammatory drugs from water using graphene oxide/metal-organic framework composites

Sarker, Mithun,Song, Ji Yoon,Jhung, Sung Hwa Elsevier 2018 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.335 No.-

<P><B>Abstract</B></P> <P>Highly porous metal-organic framework (MOF) composites were synthesized by combining MIL-101(Cr) with graphene oxide (GnO). The porosity of the GnO/MIL-101 composite was increased by composing GnO onto the MOF up to a certain ratio. The GnO/MIL-101 composites were utilized to adsorb anti-inflammatory drugs (AIDs) such as naproxen (NAP) and ketoprofen (KTP) from water. It was observed that GnO/MIL-101 composites displayed highly improved adsorption toward both NAP and KTP relative to pristine MIL-101 and commercial AC. MIL-101_GnO(3%) had a NAP adsorption capacity 2.1 and 1.4 times those of commercial AC and pristine MIL-101, respectively; its adsorption performance was also very competitive with other reported adsorbents. The improved adsorption performance of the composites for NAP was credited to H-bonding because of the presence of several functional groups in the composites. MIL-101_GnO(3%) and NAP act as a H-bond donor and acceptor, respectively. Moreover, MIL-101_GnO(3%) can be regenerated without severe deterioration by simple ethanol washing and can be reused for successive adsorption. Therefore, the GnO/MIL-101 composite is suggested as an efficient adsorbent for the removal of AIDs from water.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Highly porous graphene oxide/MOF composites were prepared in one pot synthesis. </LI> <LI> Adsorptive removal of anti-inflammatory drugs was done with the obtained composites. </LI> <LI> MIL-101_GnO(3%) showed remarkable adsorption capacity for AIDs removal. </LI> <LI> Plausible adsorption mechanism was suggested by adsorption in wide conditions. </LI> <LI> MIL-101_GnO(3%) is proposed as a promising/reusable adsorbent for removing AIDs. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Phenotypic Characterization of Aseel Chicken of Bangladesh

Sarker, Md. Jonaed Alam,Bhuiyan, Mohammad Shamsul Alam,Faruque, Md. Omar,Ali, Md. Ashraf,Lee, Jun-Heon The Korean Society of Poultry Science 2012 韓國家禽學會誌 Vol.39 No.1

The aim of this study was to investigate phenotypic characteristics, morphometric measurements, reproduction and production performances of Aseel chicken of Bangladesh. The dominant feather color of neck/hackles was red in both males (56.14%) and females (54.16%) while the sickle feather color was mostly black in both chickens (71.93% vs. 54.17%). The predominant saddle and breast feather colors were red (40.35%) and black (64.91%), respectively, in male whereas most frequent observed color was pale brown in female (58.33 and 50.0%, respectively). The predominant feather color of wing bow and wing bay was found black (68.42 and 80.70%, respectively) in male but only pale brown color was observed in females (62.5 and 54.17%, respectively) for these two characters. Different phenotypic measurements such as the average shank length and circumference were $12.79{\pm}0.13$ and $7.8{\pm}0.08$ cm, respectively, in male and $10.21{\pm}0.25$ and $5.81{\pm}0.21$ cm, respectively, in female. Keel length was $14.39{\pm}0.19$ cm in male and $10.79{\pm}0.23$ cm in female. The average adult live weight in male was measured $3749.12{\pm}83.44$ g while in female it was $2062.50{\pm}105.26$ g. The age of 1st lay was found to be 28.86 weeks. Total number of eggs laid per year ranged between 24~48, number of clutch/hen/year varied from 2 to 4 and number of eggs/clutch/hen was found to be 10~12. The average live weight of Aseel chicken at 1, 2, 3, 4, 6, 8, 10, 12, 16 and 17 weeks of age were recorded as $31.14{\pm}0.55$, $48.63{\pm}3.99$, $116.57{\pm}5.72$, $138.40{\pm}5.91$, $212.88{\pm}4.82$, $361.00{\pm}9.72$, $577.50{\pm}42.86$, $743.75{\pm}24.65$, $1086.00{\pm}26.02$, $1402.00{\pm}24.54$ and $1432.00{\pm}27.00$ g respectively. Finally, this phenotypic characterization as well as productive and reproductive performances of Aseel chicken will give the baseline information to researcher for further study and for planning any on-ward conservation and implement strategy.

Layer-by-Layer Self-Assembled Multilayer Films Composed of Graphene/Polyaniline Bilayers: High-Energy Electrode Materials for Supercapacitors

Sarker, Ashis K.,Hong, Jong-Dal American Chemical Society 2012 Langmuir Vol.28 No.34

<P>Multilayer assemblies of uniform ultrathin film electrodes with good electrical conductivity and very large surface areas were prepared for use as electrochemical capacitors. A layer-by-layer self-assembly approach was employed in an effort to improve the processability of highly conducting polyaniline (PANi) and chemically modified graphene. The electrochemical properties of the multilayer film (MF-) electrodes, including the sheet resistance, volumetric capacitance, and charge/discharge ratio, were determined by the morphological modification and the method used to reduce the graphene oxide (GO) to reduced graphene oxide (RGO) in the multilayer films. The PANi and GO concentrations could be modulated to control the morphology of the GO monolayer film in the multilayer assemblies. Optical ellipsometry was used to determine the thickness of the GO film in a single layer (1.32 nm), which agreed well with the literature value (∼1.3 nm). Hydroiodic acid (HI), hydrazine, or pyrolysis were tested for the reduction of GO to RGO. HI was found to be the most efficient technique for reducing the GO to RGO in the multilayer assemblies while minimizing damage to the virgin state of the acid-doped PANi. Ultimately, the MF-electrode, which could be optimized by fine-tuning the nanostructure and selecting a suitable reduction method, exhibited an excellent volumetric capacitance, good cycling stability, and a rapid charge/discharge rate, which are required for supercapacitors. A MF-electrode composed of 15 PANi/RGO bilayers yielded a volumetric capacitance of 584 F/cm<SUP>3</SUP> at a current density of 3.0 A/cm<SUP>3</SUP>. Although this value decreased exponentially as the current density increased, approaching a value of 170 F/cm<SUP>3</SUP> at 100 A/cm<SUP>3</SUP>, this volumetric capacitance is one of the best yet reported for the other carbon-based materials. The intriguing features of the MF-electrodes composed of PANi/RGO multilayer films offer a new microdimensional design for high energy storage devices for use in small portable electronic devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2012/langd5.2012.28.issue-34/la3021589/production/images/medium/la-2012-021589_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la3021589'>ACS Electronic Supporting Info</A></P>

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.

Facile and rapid preparation of platinum counter electrodes for dye-sensitized solar cells

Sarker, S.,Seo, H.W.,Bakare, F.O.,Aziz, Md.A.,Kim, D.M. Elsevier Sequoia 2016 Journal of photochemistry and photobiology Chemist Vol. No.

<P>Here, we report on the deposition of platinum nanoparticles (PNPs) on fluorine-doped tin oxide (FTO) substrate by synthesizing PNPs through chemical reduction of potassium tetrachloroplatinate with formic acid, and subsequently depositing the PNPs on FTO substrate at 70 degrees C; and application of the chemically reduced Pt electrodes (CRs) as the counter electrodes (CEs) of dye-sensitized solar cells (DSSCs). The surface morphology and catalytic activity of the prepared CRs were studied along with conventional thermally decomposed Pt electrodes (TDs). Electrochemical study showed that the catalytic performance of the CRs toward the reduction of I-3(-) was comparable to that of TDs. Also, the photovoltaic performance of the DSSCs with CRs were similar to that with TDs. The method of preparing Pt electrodes through chemical reduction is so fast that the whole process of preparing a set of CRs, after pre-cleaning of the FTO substrates, takes less than 30 min. Most importantly, the present method enables low temperature fabrication of Pt electrodes even on flexible substrates. (C) 2016 Elsevier B.V. All rights reserved.</P>

Growth Promotion of Pavlova viridis by Bacteria Isolated from the Microalga

Sarker Anowarul Kabir Ahamed(사커 아노와룰 아하메드),Jin-Joo Kim(김진주),Tae-O Choi(최태오),Tae-Jin Choi(최태진) 한국생명과학회 2015 생명과학회지 Vol.25 No.5

해양 미세조류인 파블로바 비리디스는 빨리 자라며, DHA, EPA와 같은 해양생물을 키우는데 필수적인 영양요소를 축적하는 능력을 가지고 있어 어류와 새우류 치어 사육에 이용되어 왔다. 본 연구에서는 파블로바 비리디스와 이 미세조류의 표면에 붙어서는 세균과의 공생적 상호작용을 연구하였다. 무균의 파블로바 비리디스 균주는 항생제 혼합액을 포함하는 액체배지에 반복 배양함으로써 얻어졌다. 무균상태는 항생제를 포함하지 않는 배지에 3번 계대 배양한 후 확인하였다. 무균상태의 조류는 이 조류로부터 분리되었으며, 임의로 I1?I5로 명명한 세균과 혼합배양하면서 조류의 성장 촉진 효과를 조사하였다. 모든 세균이 파블로바 비리디스의 생장을 촉진하였으며, 그 중 I3로 명명한 세균이 5가지 세균 중 가장 효과가 좋았다. 혼합배양 상태에서 파블로바 비리디스의 세포 수는 대조구에 비하여 유의하게 많았다. I3의 16S rRNA 유전자에 대한 염기서열 분석 결과 시트로박터 종의 그것과 97%의 염기서열 상동성을 보였다. I3을 파블로바 비리디스와 혼합배양할 경우 I3의 성장도 유의하게 증가하였으며, 이것은 조류와 그 표면에 부착하여 살아가는 세균들 사이에 공생관계가 존재한다는 것을 제시한다. 미세조류와 세균과의 공생관계는 전자현미경적 관찰을 이용하여 확인하였다. The marine microalga Pavlova viridis can grow fast and has the ability to accumulate essential nutrients for culturing marine animals, such as EPA and DHA, and it has been used as food for raring larval fish and prawn. The symbiotic relationship between the flagellate microalga Pavlova viridis and its associated bacteria was investigated. An axenic culture of P. viridis was obtained by repeated treatment of the microalga with an antibiotic cocktail. The axenic status was confirmed after sub-culturing three times in a sterile f/2 medium without an antibiotic. The axenic alga was then co-inoculated with five bacteria, arbitrarily designated as I1?I5, isolated from the alga to test the growth promotion of the algae. All bacterial strains promoted the growth of P. viridis, and bacterial isolate I3 was the most effective among the five bacteria tested. The cell number of P. viridis in the co-culture with I3 was significantly higher than that of the control culture. A sequence analysis of the 16S rRNA gene isolated from I3 revealed a 97% nucleotide sequence similarity to that of Citrobacter sp. The growth of strain I3 was also significantly enhanced by co-culturing with P. viridis, indicating a symbiotic relationship between the microalga and its associated bacterium. The association between the microalga and bacterium was confirmed by scanning electron microscopy.