• Title/Summary/Keyword: Advanced treatment

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Effects of Vacuum Heat Treatment and Salt bath Heat Treatment Conditions on Mechanical Properties of High Speed tool Steel (금속도 공구강의 기계적 성질에 미치는 진공열처리와 염욕열처리 조건의 영향)

  • Kim, Je-Don;Kim, Kyung-Sik
    • Journal of the Korean Society for Heat Treatment
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    • v.26 no.1
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    • pp.7-13
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    • 2013

  • Vacuum heat treatment(indirect heating method) has long exposure time at high temperature and low quenching rate. Contrarily salt bath heat treatment (direct heating method) has short exposure time at high temperature and fast cooling rate. With these different features of processes, mechanical properties such as hardness, tensile strength and impact strength of products show very different results. In this study, Salt bath heat treated products showed higher tensile strength and impact strength than vacuum heat treated products but hardness was not much different. These lower mechanical properties of vacuum heat treated products are due to differences in heat process and secondary hardening with high temperature tempering process. Consequently, It indicates that salt bath heat treatment is better way than vacuum heat treatment for product to have high mechanical properties.

  • https://doi.org/10.12656/jksht.2013.26.1.7 인용 PDF KSCI

Variation of optimization techniques for high dose rate brachytherapy in cervical cancer treatment

  • Azahari, Ahmad Naqiuddin;Ghani, Ahmad Tirmizi;Abdullah, Reduan;Jayamani, Jayapramila;Appalanaido, Gokula Kumar;Jalil, Jasmin;Aziz, Mohd Zahri Abdul
    • Nuclear Engineering and Technology
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    • v.54 no.4
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    • pp.1414-1420
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    • 2022

  • High dose rate (HDR) brachytherapy treatment planning usually involves optimization methods to deliver uniform dose to the target volume and minimize dose to the healthy tissues. Four optimizations were used to evaluate the high-risk clinical target volume (HRCTV) coverage and organ at risk (OAR). Dose-volume histogram (DVH) and dosimetric parameters were analyzed and evaluated. Better coverage was achieved with PGO (mean CI = 0.95), but there were no significant mean CI differences than GrO (p = 0.03322). Mean EQD2 doses to HRCTV (D90) were also superior for PGO with no significant mean EQD2 doses than GrO (p = 0.9410). The mean EQD2 doses to bladder, rectum, and sigmoid were significantly higher for NO plan than PO, GrO, and PGO. PO significantly reduced the mean EQD2 doses to bladder, rectum, and sigmoid but compromising the conformity index to HRCTV. PGO was superior in conformity index (CI) and mean EQD2 doses to HRCTV compared with the GrO plan but not statistically significant. The mean EQD2 doses to the rectum by PGO plan slightly exceeded the limit from ABS recommendation (mean EQD2 dose = 78.08 Gy EQD2). However, PGO can shorten the treatment planning process without compromising the CI and keeping the OARs dose below the tolerance limit.

  • https://doi.org/10.1016/j.net.2021.10.004 인용 PDF KSCI