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- 저자 : Phak, Hyon-Su (검색결과 6 건)
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Hypofractionated stereotactic body radiotherapy in low- and intermediate-risk prostate carcinoma
Kim, Hun Jung,Phak, Jeong Hoon,Kim, Woo Chul The Korean Society for Radiation Oncology 2016 Radiation Oncology Journal Vol.34 No.4
Purpose: Stereotactic body radiotherapy (SBRT) takes advantage of low ${\alpha}/{\beta}$ ratio of prostate cancer to deliver a large dose in few fractions. We examined clinical outcomes of SBRT using CyberKnife for the treatment of low- and intermediate-risk prostate cancer. Materials and Methods: This study was based on a retrospective analysis of the 33 patients treated with SBRT using CyberKnife for localized prostate cancer (27.3% in low-risk and 72.7% in intermediate-risk). Total dose of 36.25 Gy in 5 fractions of 7.25 Gy were administered. The acute and late toxicities were recorded using the Radiation Therapy Oncology Group scale. Prostate-specific antigen (PSA) response was monitored. Results: Thirty-three patients with a median 51 months (range, 6 to 71 months) follow-up were analyzed. There was no biochemical failure. Median PSA nadir was 0.27 ng/mL at median 33 months and PSA bounce occurred in 30.3% (n = 10) of patients at median at median 10.5 months after SBRT. No grade 3 acute toxicity was noted. The 18.2% of the patients had acute grade 2 genitourinary (GU) toxicities and 21.2% had acute grade 2 gastrointestinal (GI) toxicities. After follow-up of 2 months, most complications had returned to baseline. There was no grade 3 late GU and GI toxicity. Conclusion: Our experience with SBRT using CyberKnife in low- and intermediate-risk prostate cancer demonstrates favorable efficacy and toxicity. Further studies with more patients and longer follow-up duration are required.
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Hypofractionated stereotactic body radiotherapy in lowand intermediate-risk prostate carcinoma
Hun Jung Kim,Jeong Hoon Phak,Woo Chul Kim 대한방사선종양학회 2016 Radiation Oncology Journal Vol.34 No.4
Purpose: Stereotactic body radiotherapy (SBRT) takes advantage of low α/β ratio of prostate cancer to deliver a large dose in few fractions. We examined clinical outcomes of SBRT using CyberKnife for the treatment of low- and intermediate-risk prostate cancer. Materials and Methods: This study was based on a retrospective analysis of the 33 patients treated with SBRT using CyberKnife for localized prostate cancer (27.3% in low-risk and 72.7% in intermediate-risk). Total dose of 36.25 Gy in 5 fractions of 7.25 Gy were administered. The acute and late toxicities were recorded using the Radiation Therapy Oncology Group scale. Prostatespecific antigen (PSA) response was monitored. Results: Thirty-three patients with a median 51 months (range, 6 to 71 months) follow-up were analyzed. There was no biochemical failure. Median PSA nadir was 0.27 ng/mL at median 33 months and PSA bounce occurred in 30.3% (n = 10) of patients at median at median 10.5 months after SBRT. No grade 3 acute toxicity was noted. The 18.2% of the patients had acute grade 2 genitourinary (GU) toxicities and 21.2% had acute grade 2 gastrointestinal (GI) toxicities. After follow-up of 2 months, most complications had returned to baseline. There was no grade 3 late GU and GI toxicity. Conclusion: Our experience with SBRT using CyberKnife in low- and intermediate-risk prostate cancer demonstrates favorable efficacy and toxicity. Further studies with more patients and longer follow-up duration are required.
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포병부대 계획표적 사격시간 단축을 위한 표적할당에 관한 연구
황원식,천윤환,박현수,윤상흠,Hwang, Won-Shik,Chun, Youn-Hwan,Phak, Hyon-Su,Youn, Sang-Heom 한국국방경영분석학회 2010 한국국방경영분석학회지 Vol.36 No.1
Fire sequencing problem is to find a sequence of firing on the targets. The latest, because the korea artillery force is inferior in number as compared with north korea force. It is an important question to give a fatal damage to the enemy force by using prompt and accurate fire in order to overcome the lack of artillery force. Minimizing the fire finishing time will secure the adapt ability in tactical operation. In this paper, we developed a mathematical model to do allocation the fire on the targets to decrease to total fire operation time. In order to work out the fire sequencing problem, MIP is developed and the optimum solution is obtained by using ILOG OPL. If this analytical model is applied to the field artillery unit, it will improve the artillery fire force enhancement. 현대전에 있어서 대량의 화력, 신속한 기동력은 전승의 핵심요소이기 때문에 전쟁에서 승리하기 위해서는 이에 대한 과학적인 운용이 요구된다. 따라서 첨단기술을 이용한 치밀한 화력계획과 신속 정확한 타격으로 적에게 치명적인 피해를 줄 수 있어야 한다. 특히 사격이 작전개시 전에 미리 계획하여 수행하게 되는 경우는 표적별 사격 필요량에 의해 사격부대의 사격량을 할당함과 동시에 사격순서를 결정한 후 전체사격시간을 최소화함으로써 사격의 효과를 높일 수 있다. 따라서 본 연구에서는 이러한 사격완료시간을 최소화하기 위하여 동시에 표적을 타격하는 경우와 현재 야전부대에서 운용하고 있는 개별적으로 사격하는 문제 그리고 사격부대를 혼합하여 사격하는 경우의 최적의 사격완료시간을 비교하고, 사격시간 최소화를 위해 각 표적을 어떻게 할당할 것인지 수리모형을 이용하여 방안을 제시함으로써 작전계획에 맞는 사격계획표를 작성하는 것이다.
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Stag beetle fauna of Cambodia (Coleoptera: Lucanidae)
Maquart Pierre-Olivier,Yamamoto Shûhei,Sopha Sin,Chhorn Soksan,Phak Satha,Sinovas Pablo,Phauk Sophany,Boyer Sébastien 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.1
To date, no species catalogue of stag beetles (Lucanidae) has been compiled for Cambodia. According to the available literature, we assembled the checklist based on the previously recorded and recognized Cambodian lucanid species in the country. In the present paper, we newly record four species from Cambodia: Falcicornis axisopsis (Séguy, 1954); Neolucanus similis Bomans & Ratti, 1976; Prosopocoilus suturalis (Olivier, 1789); and Prosopocoilus jenkinsi (Westwood, 1848). An updated checklist of the Cambodian stag beetles is given. The total number of the Cambodian lucanid species has now reached 29, but this species count is considerably less diverse than those in neighboring countries. Our study suggested that this poor diversity is not primarily due to biogeography or small country size but to a lack of research effort.
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