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Zaffar Hayat Nawaz Khan,Hamed Abbasizadeh,Young Jun Park,Danial Khan,Deeksha Verma,Kang-Yoon Lee 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.1
A high-efficiency DC-DC buck converter with pulse-width modulation (PWM) and pulse-frequency modulation (PFM) is proposed. This converter works in PWM mode when load current is greater than 300mA. In order to improve efficiency, it switches to PFM mode when load current is less than 300mA. With suitable control and mode switch method, simulation result indicates that the converter performs continuous switching between PWM and PFM modes. The total load current is 1.67A; the maximum efficiency reaches up to 94.58%. Simulated and implemented in 0.18 μm CMOS process.
US-China Strategic Competition: Implications for International Order
Saad Bin Zaffar Sraw,Mir Sher Baz Khetran 아시아사회과학학회 2021 Jornal of Asia Social Science Vol.4 No.2
The paper attempts to identify the key areas where a strategic competition is being played out between US and China and its possible implications for overall regional and global order. It includes a broad based probe into the nuances of ramifications that this fundamental competition, which some chose to name as conflict, shall entail. Not only will it have political consequences, but will help change the overall strategic complexion and economic superstructure of the world besides altering the rules based international order beyond recognition. It is one of the most important and significant geo-strategic, geo-political and geo-economic moment of the century and we all stand at the cusp of a massive change for which we are neither ready nor prepared. The objective of the study is to investigate nature of the competition, changes it has brought to the threat spectrum, articulation of possible responses by states involved in it and ways in which it will transform the world that we see today.
Challenges in Efficient Data Warehousing
Muhammad Arif,Faheem Zaffar 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.2
Data warehousing has proved its importance as a source of decision support in competing market strategies and thus a lot of work is carried out in various aspects of it like conceptual enterprise perspective to ensure cost benefit is achieved by gaining competitive advantage which requires physical organization of data to improve the quality of data and quality of service. This paper gives insight how this is practically achieved, and where researchers are confronted with several challenges like privacy of data, access performance, efficient storage and cost benefit achievement.
Danial Khan,Hamed Abbasizadeh,Zaffar Hayat Nawaz Khan,이강윤 한국과학기술원 반도체설계교육센터 2017 IDEC Journal of Integrated Circuits and Systems Vol.3 No.3
This paper presents an ultra-low power RF-DC voltage multiplier using auxiliary transistors block to dynamically control the threshold voltage of the main chain transistors. The proposed scheme enhances the forward conduction current and reduces the reverse current by controlling the gate to source voltage of the main chain transistors. The proposed 5-stage scheme attains maximum post-layout simulated power conversion efficiency (PCE) of 33.3% at -16dBm input level and delivers 2.63 V output DC voltage to 1MΩ load. The proposed RF-DC voltage multiplier has been designed in a standard 180 nm CMOS technology.
Hair microscopy: an easy adjunct to diagnosis of systemic diseases in children
Bhattarai Dharmagat,Banday Aaqib Zaffar,Sadanand Rohit,Arora Kanika,Kaur Gurjit,Sharma Satish,Rawat Amit 한국현미경학회 2021 Applied microscopy Vol.51 No.1
Hair, having distinct stages of growth, is a dynamic component of the integumentary system. Nonetheless, derangement in its structure and growth pattern often provides vital clues for the diagnosis of systemic diseases. Assessment of the hair structure by various microscopy techniques is, hence, a valuable tool for the diagnosis of several systemic and cutaneous disorders. Systemic illnesses like Comel-Netherton syndrome, Griscelli syndrome, Chediak Higashi syndrome, and Menkes disease display pathognomonic findings on hair microscopy which, consequently, provide crucial evidence for disease diagnosis. With minimal training, light microscopy of the hair can easily be performed even by clinicians and other health care providers which can, thus, serve as a useful tool for disease diagnosis at the patient’s bedside. This is especially true for resource-constrained settings where access and availability of advanced investigations (like molecular diagnostics) is a major constraint. Despite its immense clinical utility and non-invasive nature, hair microscopy seems to be an underutilized diagnostic modality. Lack of awareness regarding the important findings on hair microscopy may be one of the crucial reasons for its underutilization. Herein, we, therefore, present a comprehensive overview of the available methods for hair microscopy and the pertinent findings that can be observed in various diseases.
Design of an efficient RF-DC voltage multiplier for RF Energy Harvesting Applications
Danial Khan,Hamed Abbasizadeh,Zaffar Hayat Nawaz Khan,Truong Thi Kim Nga,Sang Yun Kim,Ho Cheol Ryu,Kang Yoon Lee 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.1
In this paper, a RF-DC voltage multiplier is presented to efficiently convert RF signals to DC voltages. The proposed circuit uses an internal threshold voltage cancellation (IVC) scheme with auxiliary block to reduce the threshold voltage of forward-biased transistors and minimizes the reverse leakage current of the reverse-biased by dynamically controlling the gate-source voltage of the transistors in the main rectification chain. The proposed circuit is designed in 0.18 um CMOS technology. A three-stage voltage multiplier results in a maximum power conversion efficiency (PCE) of 49.1% at input power level of 0 dBm and at frequency of 900 MHz. The proposed circuit produces an output voltage of 4.94 V at 50 KΩ load.
Baba, Shahid M,Azad, Niyaz A,Shah, Zaffar A,Afroze, Dil,Pandith, Arshad A,Jan, Aleem,Aziz, Sheikh A,Dar, Fayaz A Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.4
Background: Acute promyelocytic leukemia (APML) is characterized by the reciprocal translocation t(15;17) (p22;p12) resulting in the PML-$RAR{\alpha}$ fusion gene. A dual diagnostic and follow up approach was applied including cytogenetic demonstration of the t(15;17) translocation and detection dg PML-$RAR{\alpha}$ chimeric transcripts by molecular means. Purpose: Conventional cytogenetics involving bone marrow is beset with high probability of poor metaphase index and was substituted with phytohemagglutinin (PHA)-induced peripheral blood culture based cytogenetic analysis as a diagnostic & follow up modality in APML patients of Kashmir (North India). Both qualitative (RT-PCR) and quantitative (Q-PCR) tests were simultaneously carried out to authenticte the modified cytogenetics. Materials and Method: Patient samples were subjected to the said techniques to establish their baseline as well as follow-up status. Results: Initial cytogenetics revealed 30 patients (81%) Positive for t(15;17) whereas 7 (19%) had either cryptic translocation or were negative for t(15;17). Two cases had chromosome 16q deletion and no hallmark translocation t(15;17). Q-PCR status for PML-$RAR{\alpha}$ was found to be positive for all patients. All the APML patients were reassessed at the end of consolidation phase and during maintenance phase of chemotherapy where 6 patients had molecular relapse, wherein 4 also demonstrated cytogenetic relapse. Conclusions: It was found that PHA-induced peripheral blood cytogenetics along with molecular analysis could prove a reliable modality in the diagnosis and assessment of follow up response of APML patients.
Evaluation of Tinda Gourd (Praecitrullus fistulosu) Germplasm's Yield
RAHEEL, Asfand,KHAN, Nasir Ahmad,BABAR, Raheel,ULLAH, Muhammad Arshad,ZAFFAR, Ali,IQBAL, Maouz,ASHRAF, Usman Korea FoodHealth Convergence Association 2019 식품보건융합연구 (KJFHC) Vol.5 No.3
The field experiment was conducted in vegetable area, Institute of Horticultural Sciences in University of Agriculture, Faisalabad in order to recognize morphological and fruit growth pattern and yield of Tinda (Praecitrullus fistulosus) gourd germplasm lines. Sixteen germplasm lines in which one line is used as check are included were sown and grown on flat beds in field. The field experiment was arranged as randomized complete block design (RCBD) with three replications. Data on days to maturity, fruit per vine, fruit weight in grams, fruit diameter and total yield obtained were recorded. The fruit texture is marked as phenotype parameter. All parameters were collected and then analyzed statistically. All lines and replications showed different results among each other according to parameter. The maximum DTM (days to maturity), F/P (fruit per plant), FW (fruit weight), FD (fruit diameter) and Yield were recorded was $L_0$ (68.66), $L_3$ (1.66), $L_{10}$ (248.33), $L_{13}$ (8.50) and $L_0$ (599.33) and the minimum were recorded was $L_1$ (56), $L_{11}$ (0.33), $L_0$ (198), $L_9$ (7) and $L_4$ (421) grams respectively. All lines showed smooth texture of fruits with no hairs when mature at harvesting stage.
Kim, Sang-Yun,Park, Young-Jun,Ali, Imran,Nga, Truong Thi Kim,Ryu, Ho-Cheol,Khan, Zaffar Hayat Nawaz,Park, Seong-Mun,Pu, Young Gun,Lee, Minjae,Hwang, Keum Cheol,Yang, Youngoo,Lee, Kang-Yoon Institute of Electrical and Electronics Engineers 2018 IEEE transactions on power electronics Vol.33 No.2
<P>In this paper, a high efficiency dc–dc buck converter with two-step digital pulse width modulation (DPWM) and low power self-tracking zero current detector (ST-ZCD) is proposed for Internet of Things (IoT) and ultralow power applications. The hybrid DPWM core with high linearity and low power consumption is proposed to implement the high efficiency DPWM dc–dc converter. It is composed of a two-step delay control using the counter and delay line. An adaptive window analog to digital converter is proposed to reduce the output voltage ripple within 20 mV. A dead time generator is implemented with the proposed ST-ZCD to minimize the reverse current. The ST-ZCD can improve efficiency by reducing the control loss that accounts for a large proportion of the dc–dc converter. Also, all digital type-III compensator is implemented for the low power and small die area. This chip is fabricated with a 55 nm CMOS process, which uses the standard supply voltage of 1.5–3 V to generate the output voltage of 1.2 V. The total active area is 500 μm × 300 μm. The measured peak efficiency of the DPWM dc–dc buck converter is 91.5% with a quiescent current consuming only 130 μA.</P>