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A Multi-Indexes Based Technique for Resolving Collision in a Hash Table
Yusuf, Ahmed Dalhatu,Abdullahi, Saleh,Boukar, Moussa Mahamat,Yusuf, Salisu Ibrahim International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.9
The rapid development of various applications in networking system, business, medical, education, and other domains that use basic data access operations such as insert, edit, delete and search makes data structure venerable and crucial in providing an efficient method for day to day operations of those numerous applications. One of the major problems of those applications is achieving constant time to search a key from a collection. A number of different methods which attempt to achieve that have been discovered by researchers over the years with different performance behaviors. This work evaluated these methods, and found out that almost all the existing methods have non-constant time for adding and searching a key. In this work, we designed a multi-indexes hashing algorithm that handles a collision in a hash table T efficiently and achieved constant time O(1) for searching and adding a key. Our method employed two-level of hashing which uses pattern extraction h<sub>1</sub>(key) and h<sub>2</sub>(key). The second hash function h<sub>2</sub>(key) is use for handling collision in T. Here, we eliminated the wasted slots in the search space T which is another problem associated with the existing methods.
Quality of Life in Malay and Chinese Women Newly Diagnosed with Breast Cancer in Kelantan, Malaysia
Yusuf, Azlina,Hadi, Imi Sairi Ab.,Mahamood, Zainal,Ahmad, Zulkifli,Keng, Soon Lean Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.1
Background: Breast cancer is the leading cause of cancer-related death among women in Malaysia. A diagnosis is very stressful for women, affecting all aspects of their being and quality of life. As such, there is little information on quality of life of women with breast cancer across the different ethnic groups in Malaysia. The purpose of this study was to examine the quality of life in Malay and Chinese women newly diagnosed with breast cancer in Kelantan. Materials and Methods: A descriptive study involved 58 Malays and 15 Chinese women newly diagnosed with breast cancer prior to treatment. Quality of life was measured using the Malay version of the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ-C30) and its breast-specific module (QLQ-BR23). Socio-demographic and clinical data were also collected. All the data were analyzed using SPSS version 20.0. Results: Most of the women were married with at least a secondary education and were in late stages of breast cancer. The Malay women had lower incomes (p=0.046) and more children (p=0.001) when compared to the Chinese women. Generally, both the Malay and Chinese women had good functioning quality-of-life scores [mean score range: 60.3-84.8 (Malays); 65.0-91.1 (Chinese)] and global quality of life [mean score 60.3, SD 22.2 (Malays); mean score 65.0, SD 26.6 (Chinese)]. The Malay women experienced more symptoms such as nausea and vomiting (p=0.002), dyspnoea (p=0.004), constipation (p<0.001) and breast-specific symptoms (p=0.041) when compared to the Chinese. Conclusions: Quality of life was satisfactory in both Malays and Chinese women newly diagnosed with breast cancer in Kelantan. However, Malay women had a lower quality of life due to high general as well as breast-specific symptoms. This study finding underlined the importance of measuring quality of life in the newly diagnosed breast cancer patient, as it will provide a broader picture on how a cancer diagnosis impacts multi-ethnic patients. Once health care professionals understand this, they might then be able to determine how to best support and improve the quality of life of these women during the difficult times of their disease and on-going cancer treatments.
Yusuf Kartal,Ovun Isin 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.3
For developing automotive industry, one of the focusing point is reduction of engine friction level to decrease both engine emissions and fuel consumption. Important part of researchers have focused on cold engine start period, which has higher friction loses. Shorter warm up period and faster heating of engine oil help to provide better engine performance. Not only warm up time but also better cool down period after engine stops, dramatically effects engine efficiency. If oil temperature stays hot for longer time during the vehicle key-off duration, it brings an important advantageous at the next start. Main purpose of this study is to investigate oil temperature changes depending on the design parameters of the oil pan. This investigation is done for oil warm up and cool down periods by mathematical model, which is validated for 2.0 L and 4 cylinders diesel engine. Design improvement combinations against base steel oil pan has been examined throughly in terms of oil temperature changes, warm up and cool down time, frictional loses and weight reduction opportunity. As a result, 5 mm thickness plastic oil pan with windage tray application is the best solution option since it brings both 12.5 % friction decreasing in cold start after 2 hours key-off duration, and 43 % weight reduction.
Yusuf Zuntu Abdullahi,Tiem Leong Yoon,Mohd Mahadi Halim,Md. Roslan Hashim,Mohd. Zubir Mat Jafri,Lim Thong Leng 한국물리학회 2016 Current Applied Physics Vol.16 No.8
In this paper, geometric, electric and magnetic properties of graphitic heptazine with embedded Mn atom under bi-axial tensile strain are investigated using density-functional theory with the spin polarized generalized gradient approximation and Hubbard U correction. The binding energy computed for the systems are found to uniformly decrease with the increase in small bi-axial tensile strain (0e5%). The decrease of the binding energy can be related to the increase in the NeCeN bond angle within the cavity which tries to recover its sp2 hybridized bond. The projected density of states (PDOS) of strained/unstrained systems is also computed. It is found that the covalent bonding of the 6 nitrogen atoms located at the edge of the cavity and the embedded manganese atom in CN1 is mainly contributed by s, dzx and dz2 of the Mn atom, as well as the sp-like orbitals of these nitrogen atoms in the majority spin state respectively. Our calculations also predict enhanced band gap (0.67 eV at zero strain, 1.12 eV at 4% strain) induced by small amount of bi-axial tensile strain. The increase in band gap can be attributed to the structural distortions of the sheet caused by the symmetric deformations which lead to the backward shift in the s-like orbitals states of the CN1 atoms. Such properties may be desirable for diluted magnetic semiconductors, future spintronics, molecular magnet and nanoelectronics devices.
Free vibration analysis of plates resting on elastic foundations using modified Vlasov model
Yusuf Ayvaz,Celal Burak O uzhan 국제구조공학회 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.28 No.6
An application is presented of a modified Vlasov model to the free vibration analysis of plates resting on elastic foundations. The effects of the subsoil depth, the ratio of the plate dimensions, the ratio of the subsoil depth to the plate dimension in the longer direction, and the value of the vertical deformation parameter within the subsoil on the frequency parameters of plates on an elastic foundation are investigated. This analysis has been caried out by the aid of a computer program. The first ten frequency parameters are presented in tabular and the graphical forms to evaluate the effects of the parameters considered in this study. Then mode shapes corresponding to the first six of the frequency parameters are given in graphs. It is concluded that the effect of the subsoil depth on the frequency parameters of the plates on an elastic foundation is generally larger than those of the other parameters considered in this study.
Highly Porous Biocomposite Scaffolds Fabricated by Chitosan/Alginate/Diatom for Tissue Engineering
Yusuf Özcan,Dicle Erden Gönenmiş,Esranur Kızılhan,Cem Gök 한국고분자학회 2022 폴리머 Vol.46 No.4
Tissue scaffolds based composite material have attracted great attention in the field of bone tissue engineering. Therefore, researchers are looking for new materials to be used for composite tissue scaffolding. We aimed to producethe effect of high porous and non-toxic scaffolds as hydrogels with two different contents using chitosan, alginate anddiatom. Beads were made from alginate and alginate/diatom hydrogels and additionally coated in dilute chitosan solution. Obtained alginate-chitosan (AC) and alginate/diatom-chitosan (ADC) beads were lyophilized. High-porous AC scaffoldand both high-porous and nano-porous ADC scaffold were examined in terms of density, porosity, swelling tests and morphologic, chemical, cytotoxic analysis. In this study, high porosity with approximately 450 μm pore size was found forAC and ADC scaffolds. The average pore size of diatom in ADC was acquired as 280 nm. Moreover, AC and ADC didnot show any cytotoxic effects on HEK293 cells. Our results clearly indicated that scaffolds have an alternative potentialin the field of tissue engineering