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저온 플라즈마 침질탄화처리된 마르텐사이트계 석출경화형 스테인리스강의 내식성에 미치는 시효 전처리의 영향
이인섭(Insup Lee),이천호(Chun-Ho Lee) 한국표면공학회 2020 한국표면공학회지 Vol.53 No.2
Various aging treatments were conducted on AISI 630 martensitic precipitation hardening stainless steel in order to optimize aging condition. Aging treatment was carried out in the vacuum chamber of Ar gas with changing aging temperature from 380℃ to 430℃ and aging time from 2h to 8h at 400℃. After obtaining the optimized aging condition, several nitrocarburizing treatments were done without and with the aging treatment. Nitrocarburizing was performed on the samples with a gas mixture of H₂, N₂ and CH₄ for 15 h at vacuum pressure of 4.0 Torr and discharge voltage of 400V. The corrosion resistance was improved noticeably by combined process of aging and nitrocarburizing treatment, which is attributed to higher chromium and nitrogen content in the passive layer, as confirmed by XPS analysis. The optimized condition is finalized as, 4h aging at 400℃ and then subsequent nitrocarburizing at 400℃ with 25% nitrogen and 4% methane gas for 15h at vacuum pressure of 4.0 Torr and discharge voltage of 400V, resulting in the surface hardness of around 1300 HV0.05 and α"N layer thickness of around 11 μm respectively.
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김세호(Kim Se-Ho),이천호(Lee Chun-Ho),류세환(Ryu Se-Hwan) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.4
This paper describes the application of holographic film for concentrator photovoltaic module. Holographic film is able to concentrate visible light and redirect this concentrated light to the solar cells in order to increase the efficiency of solar cells. Therefore, we have applied the Holographic film to photovoltaic module for reducing the numbers and improving the efficiency of solar cell. Also, The holographic film module sample has been designed and this designed holographic module was tested in the field. In this paper, we will present the characteristics of holographic film and discuss the application of concetrator module for silicon photovoltaic module.
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스노보드 선수들의 하지형태요인과 무산소성 운동능력 및 등속성 근파워의 관련성
천윤석(Yoon Seok Chun),윤남규(Nam Kyu Yoon),이근일(Keun Il Lee),이천호(Cheon Ho Lee) 한국체육측정평가학회 2013 한국체육측정평가학회지 Vol.15 No.3
연구는 국가대표 스노보드선수들과 프로선수들의 하지 형태요인과 전문체력에 관련성을 분석하였다. 하지 형태요인과 무산소성 운동능력의 관련성 중 하퇴장은 Mean power, Peak power, Fatigue Index, Total work에서 유의한 상관관계가 나타났으며, 대퇴최대둘레는 Mean power, Peak power, Fatigue Index, Total work에서 유의한 상관관계가 나타났다. 하퇴최대둘레에서도 Mean power, Peak power, Total work에서 유의한 상관관계가 나타났다. 하지 형태요인과 등속성 근파워의 관련성 중 하퇴장은 PPFR, PPEL, PPER, APEL, APER에서 유의한 상관관계가 나타 났으며, 대퇴최대둘레에서는 PPER, APEL에서 유의한 상관관계가 나타났고, 하퇴최대둘레에서도 PPEL, PPER, APEL, APER에서 유의한 상관관계가 나타났다. 하지 형태요인이 무산소성 운동능력에 영향을 주는 요인으로 Mean power(하퇴장, 하지장, 대퇴최대둘레), Peak power(하퇴장), Time to peak power(하퇴장, 대퇴피하지방), Fatigue Index(하퇴장), Peak power/kg(대퇴장, 하퇴장, 하지장), Mean power/kg(대퇴장, 하지장), Total work(하퇴장, 하지장, 대퇴최대둘레)에 유의하게 영향을 미치는 것으로 나타났다. 하지형태요인이 등속성 근파워에 영향을 주는 요인으로 PPER(하퇴장), PPEL(하퇴장), APFR(대퇴최대둘레), APEL(하퇴장), APER(하퇴장)에 유의하게 영향을 미치는 것으로 나타났다. 본 연구의 결과를 바탕으로 엘리트 스노보드선수들의 꿈나무 양성 및 우수 선수 선발 시 신체적, 생리적, 체력적 기준치를 제시할 수 있을 것이며, 일선 지도자들에게 과학적인 훈련 프로그램을 구성하여 경기력 향상과 이상적인 신체조성에 필요한 실험적 자료를 제공할 수 있을 것이다. The results of analysis on the relevance of lower extremity factors on professional physical strength in snowboarders in the national team and professionals are as follows. For the relevance between lower extremity factors and anaerobic exercise capacity, length of the lower limbs showed the significant correlation in Mean power, Peak power, Fatigue Index and Total work. The maximal circumference of the thighs showed the significant correlation in Mean power, Peak power, Fatigue Index and Total work. The maximal circumference of the lower legs also showed significant correlation in Mean power, Peak power and Total work. For the relevance between lower extremity factors and isokinetic muscular strength, length of the lower limbs showed the significant correlation in PPFR, PPEL, PPER, APEL and APER. The maximal circumference of the thighs showed the significant correlation in PPER and APEL. The maximal circumference of the lower legs also showed the significant correlation in PPEL, PPER, APEL and APER. It was shown that lower extremity factors affected anaerobic exercise capacity and gave significant effects on Mean power (length of the lower limb, length of legs, maximal circumference of thighs), peak power (length of lower limb), Time to peak power (length of lower limb, thigh subcutaneous fat), Fatigue Index (length of lower limb), Peak power/kg (length of thighs, length of the lowers limb, length of leg), Mean power/kg (length of thighs, length of legs) and Total work (length of the lower limbs, length of legs, maximal circumference of thighs). It was shown that lower extremity factors affected isokinetic muscular strength and gave significant effects on PPER (length of the lower limbs), PPEL (length of lower limbs), APFR (maximal circumference of thighs), APEL (length of the lower limbs) and APER (length of the lower limbs). This study could present physical and physiological standards upon rearing prominent players and selecting good players for elite snowboard players based on the results. It also can provide coaches with experimental data necessary for scientific training program, improvement on performance and ideal body composition.
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