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Park, Ji-Yeon,Lee, Jeong-Woo,Chung, Jin-Beom,Choi, Kyoung-Sik,Kim, Yon-Lae,Park, Byung-Moon,Kim, Youhyun,Kim, Jungmin,Choi, Jonghak,Kim, Jae-Sung,Hong, Semie,Suh, Tae-Suk Oxford University Press 2012 Journal of radiation research Vol.53 No.6
<P>A bio-anatomical quality assurance (QA) method employing tumor control probability (TCP) and normal tissue complication probability (NTCP) is described that can integrate radiobiological effects into intensity-modulated radiation therapy (IMRT). We evaluated the variations in the radiobiological effects caused by random errors (r-errors) and systematic errors (s-errors) by evaluating TCP and NTCP in two groups: patients with an intact prostate (G<SUB>intact</SUB>) and those who have undergone prostatectomy (G<SUB>tectomy</SUB>). The r-errors were generated using an isocenter shift of ±1 mm to simulate a misaligned patient set-up. The s-errors were generated using individual leaves that were displaced inwardly and outwardly by 1 mm on multileaf collimator field files. Subvolume-based TCP and NTCP were visualized on computed tomography (CT) images to determine the radiobiological effects on the principal structures. The bio-anatomical QA using the TCP and NTCP maps differentiated the critical radiobiological effects on specific volumes, particularly at the anterior rectal walls and planning target volumes. The s-errors showed a TCP variation of –40–25% in G<SUB>tectomy</SUB> and –30–10% in G<SUB>intact</SUB>, while the r-errors were less than 1.5% in both groups. The r-errors for the rectum and bladder showed higher NTCP variations at ±20% and ±10%, respectively, and the s-errors were greater than ±65% for both. This bio-anatomical method, as a patient-specific IMRT QA, can provide distinct indications of clinically significant radiobiological effects beyond the minimization of probable physical dose errors in phantoms.</P>
Choi, Jonghak,Park, No-Cheol,Park, Young-Pil,Park, Kyoung-Su IEEE 2017 IEEE transactions on magnetics Vol.53 No.3
<P>This paper analyzed the effect of lubricant contact on slider dynamics under the unsteady proximity condition, which is related to the intermolecular forces between the slider and disk. To investigate the slider dynamics, an experiment was conducted with a commercial drive, and the slider dynamics were analyzed during touch-down and takeoff (TO) considering the approach and withdrawal speeds of the slider. The instability of the slider dynamics increased under the rapid withdrawal condition during TO.</P>
Operational Shock Analysis for 2.5-in Multi-Disk HDD Considering Ramp–Disk Gap Irregularity
Yoon, Joo Young,Choi, Jonghak,Lim, Geonyun,Park, No-Cheol,Park, Young-Pil,Park, Kyoung-Su,Kim, Minjae IEEE 2017 IEEE transactions on magnetics Vol.53 No.3
<P>With an increased mobility, hard disk drives (HDDs) now use ramp load/unload technology, and multiple disks are used to increase the data capacity. This can result in contact between the ramp and the disks, which negatively affects the slider dynamics under operational shock conditions. There are several types of ramp-disk contact, such as simultaneous, successive, and single contact, and these depend on the distance between the ramp and each disk in a multi-disk HDD. This paper examines the effect of ramp-disk contact on the slider dynamics using a transient shock analysis. The ramp-disk contact affects the head stack assembly bending mode and slider dynamics. The effect of irregular gaps between the disks and adjacent ramp on the slider dynamics is analyzed with the ramp-disk contact force. The simulation shows that the gap irregularity between the ramp and each disk should be as small as possible to improve the stability of the slider dynamics.</P>