http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
An Efficient Approach for Lightpath Restoration in WDM Networks
Kabir, S.M. Humayun,Pham, Van Su,Yoon, Gi-Wan The Korea Institute of Information and Commucation 2008 Journal of information and communication convergen Vol.6 No.1
WDM is an incredibly promising technique in which multiple channels are operated along a single fiber, providing the facilities of terabit per second bandwidth. Thus, the survivability of WDM networks becomes critical for the success of the next generation internet architecture. Despite the fact that the path-based proactive restoration scheme guarantees 100% restoration as it computes a backup light path while the primary light path is being set up, this method results in additional capacity consumption. In this paper, an ideal technique is proposed that modifies the active multi-backup paths method and results in a better restoration scheme. Based on a theoretical analysis, a new method is shown to reduce the number of hopes as well as the restoration time.
A Formula Derivation of Channel Capacity Calculation in a MIMO System
Kabir, S.M.Humayun,Lee, Eun-Ju,Yoon, Gi-Wan The Korea Institute of Information and Commucation 2009 Journal of information and communication convergen Vol.7 No.2
In this letter, we derive a tight closed-form formula for an ergodic capacity of a multiple-input multiple-output (MIMO) for the application of wireless communications. The derived expression is a simple closed-form formula to determine the ergodic capacity of MIMO systems. Assuming the channels are independent and identically distributed (i.i.d.) Rayleigh flat-fading between antenna pairs, the ergodic capacity can be expressed in a closed form as the finite sum of exponential integrals.
근대 중 Dimethomorph의 잔류 양상 및 위해성 평가
( Humayun Kabir ),( Musfiqur Rahman ),( Abd El-aty ),정형석 ( Hyung Suk Chung ),이한솔 ( Han Sol Lee ),심재한 ( Jae-han Shim ) 한국환경농학회 2017 한국환경농학회 학술대회집 Vol.2017 No.-
The residue analysis of dimethomorph in Swiss chard cultivated at two different locations under plastic house conditions were carried out using liquid chromatography-ultraviolet detector (LC-UVD). The LC-UVD result was confirmed using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The sample was collected randomly over 14 days. The sample extracted using acetonitrile and partitioning by solid liquid extraction using 15 g NaCl, for cleanup florisil solid phase extraction (SPE) cartridge was used. The standard showed excellent linearity in the range (0.05-50.0 mg/L) with correlation coefficient (R<sup>2</sup>=0.9996), and the recovery ranged from (82.98-95.43%) with relative standard deviaton (RSD) less than 5.12% and the limit of detection and quantification was 0.0033 and 0.01 mg/kg respectively. The initial (0 day) residue amount was 7.57 and 8.55 mg/kg for site 1 and site 2 respectively. The dissipation half life was 5.0/5.1 days for site 1/site2. Pre harvest residue limit (PHRL) curve showed if the residue amount below 50.14/49.83 mg/kg 5 days before harvest and below 83.81/82.27 mg/kg 10 days before harvest then the residue will be below the maximum residue limit (MRL) 30.0 mg/kg during the harvest. The risk assessment considering the experimental conditions and Korean peoples diet habits, the accepted daily intake (ADI)% at 0 days sample 0.084/0.094% and at 10 days sample 0.014%. The lowe ADI % showed the safety of uses of this pesticide on Swiss chard and these data may be useful to recommend for the use of this pesticide on some similar vegetables.
pH 완충 용액 환경에서 기가급 강도의 강철과 열 영향부에서 발생하는 피로균열 전파에 대한 부식 영향 연구
Humayun Kabir,이흥식 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.4
In this study, corrosion fatigue crack propagation was investigated in pH buffer environment using the giga strength steel and its heat-affected zone, and the results were compared with theoretical model prediction. Also, the pure corrosion effect on fatigue crack propagation in a corrosive environment was compared with the modified Forman equation. As results, the average value of corrosion rate obtained as the ratio of the net corrosion-induced crack length to the total crack length under cyclic loading in the base metal and heat-affected zone under experimental loading conditions. These results exhibit a new theoretical method for corrosion fatigue crack propagation that predicts a purely corrosion effect on the behavior to be determined.
Humayun Kabir,이흥식 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.4
In this paper, a simulation computerized crash analysis evaluation method through reverse engineering was applied to the Defender vehicle to systemize and simplify the certification of small-scale electric vehicles. The Defender vehicle was selected as a benchmarking vehicle that converts into an electric vehicle, and the layout of the frame and element analysis of individual parts were conducted through reverse engineering. To review the vehicle package layout, the fastening and assembly method for each part was analyzed referring to the Defender maintenance guide and parts list, and it was used for frame element technology analysis. In addition, collisions according to the main frame material and the shape of the crash box were analyzed, and various cases were analyzed through parameter study. As a result of the crash analysis, it was found that the mild steel main frame could not guarantee the safety of the vehicle in a fixed wall collision situation, and the ATOS material would increase the collision safety of the Defender relatively. Through the crash analysis according to the shape of the crash box, it was found that the strength of the crash box is too high compared to the main body, and this should be reflected in the design for small-volume production of multiple products.
Kabir, Md. Humayun,Abd El-Aty, A.M.,Rahman, Md. Musfiqur,Chung, Hyung Suk,Lee, Han Sol,Jeong, Ji Hoon,Wang, Jing,Shin, SungShik,Shin, Ho-Chul,Shim, Jae-Han Elsevier 2018 Regulatory toxicology and pharmacology Vol.92 No.-
<P><B>Abstract</B></P> <P>The residual behavior of the systemic fungicide, metalaxyl, in Swiss chard cultivated at two different locations under greenhouse conditions was investigated using high-performance liquid chromatography coupled with an ultraviolet detector (HPLC-UVD). Samples were randomly collected over 14 days and extracted using acetonitrile, partitioned using solid sodium chloride, and a solid-phase extraction (SPE) NH<SUB>2</SUB> cartridge was used for cleanup. The linearity over a concentration range 0.05–50 mg/L was excellent with a coefficient of determination (<I>R</I> <SUP> <I>2</I> </SUP>) of 0.9997. The recovery rate ranged from 77.05 to 88.92% with relative standard deviations (RSDs) ≤ 10.74, and the limits of detection (LOD) and quantification (LOQ) were 0.0033 and 0.01 mg/kg, respectively. The initial (2 h after application) deposits were 4.69 and 5.90 mg/kg for sites 1 and 2, respectively, which increased to 4.95 and 6.57 mg/kg, respectively, one day post-application, owing to the systemic properties of the fungicide. The dissipation half-life was 5.3 and 6.0 days for sites 1 and 2, respectively. The pre-harvest residue limit (PHRL) suggested that if 55.38 and 47.23 mg/kg was applied 10 days before harvest or 33.28 and 30.73 mg/kg was applied 5 days before harvest (for sites 1 and 2, respectively) then the concentration will fall below the maximum residue limit (MRL = 20.0 mg/kg) at the time of harvest. The dietary risk assessment, estimated as hazard quotient (RQ%), indicate that metalaxyl can be safely used in/on Swiss chard, with no hazardous effects expected for consumers.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Metalaxyl residual behavior was investigated under greenhouse conditions. </LI> <LI> Swiss chard were extracted with ACN and analyzed using HPLC-UVD. </LI> <LI> The method performance was good with satisfactory parameters. </LI> <LI> Residues were decreased by time, except for 1 day post-application. </LI> <LI> The analyte can be safely used in Swiss chard with no hazardous effects expected for consumers. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kabir, Mohammad Humayun,Wang, Myeong-Hyeon The Korean Society for Applied Biological Chemistr 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.6
Dehydroascorbate reductase (DHAR) plays an important role in the ascorbate-glutathione cycle in plants by controlling the homeostasis of reactive oxygen species. Expression profiles of two DHAR genes (SlDHAR1 and SlDHAR2) in tomato leaves were analyzed in response to abiotic and oxidative stresses as well as their expression in various organs were investigated under normal growth conditions. Multiple copies of SlDHAR homologues exist in the tomato genome. SlDHAR1 expression was dominant in stems and flowers but moderate in leaves; however, SlDHAR2 induction was strong in stems, leaves, and flowers, and young leaves showed the highest expression of SlDHAR2. Both genes were transcribed after treatment with salt, dehydration, and methyl viologen. Prolonged stress reduced SlDHAR genes expression. The level of hydrogen peroxide increased, and DHAR activity was altered by stress treatment. Results indicate that SlDHAR genes could play a role in multiple stress responses.
Response of Calcineurin B-like Protein Kinase Gene in Tomato to Various Abiotic Stresses
Kabir, Mohammad Humayun,Wang, Myeong-Hyeon The Korean Society for Applied Biological Chemistr 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.1
This study describes the expression patterns of the CBL interacting protein kinase (SlCIPK) gene in Solanum lycopersicum after treatment with various abiotic stresses, such as salt, dehydration and mechanical wounding. The cDNA of the SlCIPK gene from the tomato leaf encodes 446 amino acids and shows significant homology with other plant CIPK proteins. SlCIPK is a single copy gene in the tomato genome. The organ-specific expression pattern of the SlCIPK gene revealed that the transcript of this gene was present in all tissues examined (roots, stems, leaves and flowers), with strong expression being observed in the roots. Additionally, the SlCIPK gene was upregulated in response to salt, dehydration and wounding. Moreover, SlCIPK was regulated by abscisic acid (ABA) and calcium. Taken together, these results indicate that SlCIPK gene may play a role in the response to abiotic stresses via ABA-mediated calcium signaling.