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Laser cutting study of zirconium alloys for nuclear decommissioning
신재성,옥준수,최성열 한국원자력학회 2025 Nuclear Engineering and Technology Vol.57 No.2
We conducted laser cutting studies on zirconium alloys, specifically Zircaloy-2 and Zr-2.5%Nb alloy, which are used as constituent materials in the nuclear fuel channel of a pressurized heavy water reactor. The study measured the maximum cutting speed, amount of secondary emissions, and aerosol characteristics for each material using 10 mm thick plate specimens. The cutting performance of the zirconium alloys was similar to each other. At a laser power of 1–5 kW, the maximum cutting speed ranged from 750 to 1900 mm/min, and the amount of secondary emissions per length ranged from 32 to 53 g/m. Compared to 304 L stainless steel, the maximum cutting speed was 1.7–1.9 times higher, and the amount of secondary emissions was about 60–70 % of that of stainless steel. Analyzing the physical properties of aerosols, both zirconium alloys generated larger particles with a count median aerodynamic diameter of 0.25 μm, which is approximately 15–17 % larger than that of 304 L stainless steel.
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신재성,김현준,김성원,이기주,박재성,오범석 한국항공우주학회 2023 韓國航空宇宙學會誌 Vol.51 No.1
X-37b is a fairly new but very successful uncrewed technology demonstrator that can reenter Earth’s atmosphere, partially replacing the reentry mission of the Space Shuttle program that retired after serving decades in the United States of America. For this, an improved, thermal protection system(TPS) was built with the heritage of previous reentry spacecraft, in particular based on silica ceramic tiles. In view of the TPS design, it is noteworthy that the leading edge of X-37b wings is made in new material called TUFROC instead of the flight-proven RCC(Reinforced Carbon-Carbon) of the Space Shuttle era. In this study, the technologies of Space Shuttle TPS and TUFROC are analyzed.
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전립선암의 간헐적 남성호르몬 차단요법에서 조기 호르몬 불응성 이행의 예측인자
신재성,최형준,최양수,채수응,최한용 대한비뇨의학회 2004 Investigative and Clinical Urology Vol.45 No.9
Purpose: The purpose of this study was to define the predictive factors for the early progression of androgen independent prostate cancer in patients receiving intermittent androgen deprivation(IAD) therapy. Materials and Methods: A total of 101 patients(stages A to C in 29 and stage D in 72), who had completed at least 1 cycle of IAD, were included. A variety of possible prognostic factors, such as age, initial prostate-specific antigen(PSA) and testosterone, Gleason score, lymph node or bone metastasis, nadir PSA and testosterone, duration to nadir PSA, duration of off treatment, and ECOG performance index were analyzed using uni- and multivariate tests. Results: Patients had completed at least one, and up to six, treatment cycles with a median follow-up of 43(13-100) months. The median nadir PSA levels were 0.28, 0.41, 0.71, 0.88, 1.85 and 0.79ng/ml for cycles 1 to 6 (median 4.6 months), respectively. The median one cycle duration(on+off treatment) was 14 months, 44% of that time spent off treatment, but the off treatment duration decreased with increasing number of treatment cycles. A total of 42 patients progressed to androgen independent prostate cancer, and the progression free rates at 36 and 60 months were 72 and 52%, respectively, according to the Kaplan-Meier method. Using multivariate analysis, the nadir PSA(p=0.044), ECOG performance index(p= 0.039) and lymph node or bone metastasis(p=0.03) were the strongest predictors for the progression of androgen independent prostate cancer. Conclusions: On receiving IAD, prostate cancer patients with lymph node or bone metastasis, a poor performance status and comparatively higher serum PSA nadir value after the first treatment phase, there is a high possibility for the early progression of androgen independent prostate cancer. (Korean J Urol 2004;45:858-864)
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사업연속성경영시스템(BCMS)이 재난관리 성과와 재난현장 대응에 미치는 영향에 관한 연구
신재성,정종수 한국재난정보학회 2024 한국재난정보학회 논문집 Vol.20 No.2
연구목적: 본 연구의 목적은 사업연속성경영시스템(BCMS) 7개 하위 구성요인이 재난 관리 성과와 재 난현장 대응에 미치는 영향을 분석하는 것이다. 연구방법: 선행연구를 통해 가설을 설정하고 통신사업 기관 종사자 대상으로 설문조사를 시행한 후 총 327부의 자료를 수집하여 통계적 분석을 통해 가설을 검 증하였다. 연구결과: 첫째 사업연속성경영시스템(BCMS)의 리더십, 기획, 지원, 운영, 성과평가는 재난 관리성과에 정(+)의 방향으로 영향을 미치는 것으로 나타났다. 둘째 사업연속성경영시스템의 리더십, 기획, 지원, 운영, 성과평가, 개선은 재난현장 대응에 정의(+)의 방향으로 영향을 미치는 것으로 나타났 다. 결론: 사업연속성경영시스템은 재난관리 성과와 재난현장 대응에 전반적으로 유의한 영향을 미치는 것으로 확인되었다. 기업의 재난관리성과와 재난현장 대응력을 높이기 위해서는 사업연속성경영시스 템(BCMS)의 구축과 운영이 필요하다. Purpose: The purpose of this study is to analyze the impact of seven sub-components of the business continuity management system(BCM) on disaster management performance and disaster site response. Method: After establishing a hypothesis through prior research and conducting a survey of employees of telecommunication business organizations, a total of 327 pieces of data were gathered and the hypothesis was verified through statistical analysis. Result: First, the leadership, planning, support, operation, and performance evaluation of the business continuity management system were found to have a positive (+) impact on disaster management performance. Second, leadership, planning, support, operation, performance evaluation and improvement were found to have a positive (+) impact on disaster scene response. Conclusion: The business continuity management system was confirmed to have an overall significant impact on disaster management performance and disaster site response. In order to improve a company's disaster management performance and ability to respond to disaster scenes, it is necessary to establish and operate a business continuity management system.
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