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홍성철(Seong-Cheol Hong),황성욱(Sung-Wook Hwang),이원희(Won-Hee Lee) 한국가구학회 2012 한국가구학회지 Vol.23 No.2
It was investigated present condition and enhancement of wooden playground. Wood material is the concept of eco-friendly materials. Wood is the best material which helps children to improve their emotional and physical quality. Recently, the number of wooden playgrounds was reduced but synthetic resin material has greatly increased. It was because of the high construction cost of wooden playground. Therefore, to increase the number of wooden playgrounds, it is the most important to remind people of positive recognition about wood material.
정부지원 R&D의 중소기업 기술 및 고용 성과에 대한 연구
노용환,홍성철,Noh, Yong-Hwan,Hong, Sung Cheol 기술경영경제학회 2016 Journal of Technology Innovation Vol.24 No.2
본 연구는 정부의 중소기업 R&D 지원 사업에 대한 효과를 개별 사업체 수준자료를 활용하여 추정하였다. 2010년도 정부 R&D 지원 사업에 참여한 업체의 기술성과, 민간 R&D 유인효과, 고용효과를 사업체 수준에서 분석하였다. 본 연구의 결과는 다음과 같다. 첫째, 정부의 중소기업에 대한 R&D 투자(규모 및 건수)는 국내 특허 등록 실적에 정(+)의 영향을 미치는 것으로 나타났다. 특히 국내외 특허 등록 실적은 자산규모가 큰 사업체일수록 많은 것으로 나타났으나, 정부투자 연구사업 주관업체의 기술성과는 공동 위탁 참여업체에 비해 오히려 낮은 것으로 추정되었다. 둘째, 정부의 R&D 정책은 민간 R&D 인센티브와 보완적 기능을 가지고 있는 것으로 추정되었으며, 정부 R&D 투자 1% 증가는 사업 종료 후 민간업체의 R&D 지출을 비탄력적으로(0.193~0.245%) 증가시키는 것으로 나타났다. 셋째, 정부의 R&D 지원이 참여기업의 고용 성장에 기여한 것으로 나타났다. 특히, R&D 지원의 고용에 대한 성과가 기업규모 및 기술수준별로 차이를 보임에 따라 정부의 R&D 정책에 있어 기업의 특성을 고려한 차별적 지원이 필요하다. This paper used individual establishment level data to estimate the effects of government support for the research and development of 'small and medium enterprises'(SMEs). We analyzed, on the establishment level, the degree of technical advancement, strength of private R&D incentives, and the effect on employment levels of firms which participated in the 2010 government R&D support project. The results of this study are as follows. First, the size and frequency of government investment in the R&D of SMEs were both positively correlated with the amount of patent registrations. Furthermore, we found that the amount of patent registrations were positively correlated with the size of the establishments, but the average level of technological advancement for the firms running the research was lower than the average level of technological advancement for the firms merely participating in the project. Second, the government's R&D policy was found to be complementary to private R&D incentives, and a 1% increase in government R&D investment resulted in an inelastic increase (0.193~0.245%) of the firms' post-program R&D spending. Third, we found that R&D support from the government contributed to an increase of employment by the participating firms. Additionally, we found that the impact of R&D support on job creation varied for the firm size and technological characteristics. Therefore, it is important for governments to take into consideration each type of small business, when setting R&D policies.
황성욱(Sung-Wook Hwang),박상범(Sang-Bum Park),서진석(Jin-Suk Suh),김종인(Jong-In Kim),홍성철(Seong-Cheol Hong),이원희(Won-Hee Lee) 한국가구학회 2012 한국가구학회지 Vol.23 No.4
This study was conducted to investigate the surface hardness of thermally-compressed larch wood by compression set and temperature. The surface hardness of thermally-compressed larch wood increased with increasing compression set and temperature. For compression set 60%, the specific gravity was increased as 0.93. However, the surface hardness was lower value as 31.1 N/㎟ compared with a similar specific gravity of the tropical timber. For density profile, less than compression set 40%, compression was observed mainly surface area. On the other hand, more than 50%, density profile variation was reduced by compression of central part. Results of this study indicate that thermally-compressed larch wood can be replace some imported hardwoods such as oak or cherry. However, thermally-compressed larch wood was difficult to replace the tropical timber being imported in terms of surface hardness.
연구노트 : 한반도 기후 변화 적응을 위한 취약성 지수 산정에 관한 고찰
김철희 ( Cheol Hee Kim ),김은화 ( Eun Hwa Kim ),송창근 ( Chang Keun Song ),홍유덕 ( You Deog Hong ),유정아 ( Jeong A Yoo ),홍성철 ( Sung Cheol Hong ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.6
Climate change assessment, together with climate change adaptation process, would be one of the worldwide important issues, and the study on climate change vulnerability indicator has been an essential problem for climate change adaptation. Vulnerability indicator can be used as a good tool to estimate the impact of climate change and to map out the distribution of its vulnerability over the given area both in Korea and other countries. This study addressed the conceptual summary on the assessment of climate change and its adaptation process. Previous studies on how to yield the vulnerability indicators of climate change are reviewed and several previous results of vulnerability indicators applied to Korean provinces are also discussed here.
노인병의 역학적 연구 - 제 6 편 노인의 생화학검사소견
송희승 ( Hee Sung Song ),서순규 ( Soon Kyu Suh ),이경원 ( Kyoung Won Lee ),이항열 ( Hang Youl Lee ),김기홍 ( Ki Hong Kim ),홍성철 ( Sung Cheol Hong ) 대한내과학회 1971 대한내과학회지 Vol.14 No.11
Biochemical studies of blood in the apparently healthy aged and aged patients were studied and following results were obtained. 1) Serum total protein and albumin levels were decreased and serum globulin level was inceased in the aged. Serum lipids levels
2비트 시그마-델타 변조를 이용한 새로운 폴라 트랜스미터
임지연,전상훈,김경학,홍성철,김동욱,Lim, Ji-Youn,Cheon, Sang-Hoon,Kim, Kyeong-Hak,Hong, Song-Cheol,Kim, Dong-Wook 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.8
본 논문에서는 2비트 시그마-델타 변조기를 도입한 새로운 구조의 폴라 트랜스미터에 대해 논의한다. 제안된 구조에서는 2비트 시그마-델타 변조 방식을 도입하여 양자화 잡음을 낮추도록 하였다. 전력 증폭기는 2비트 디지털 처리된 진폭 신호를 받아들이기 위하여 2진법의 형태로 분할되도록 고안되었다. 새로운 구조의 폴라 트랜스미터를 EDGE 시스템에 적용하여 시뮬레이션 한 결과, 전체 전송 대역에서 스펙트럼 특성이 개선되는 것을 확인할 수 있었다. 2비트 변조기에 세밀한 양자화 방식을 적용함으로써 오버 샘플링 비가 2배 이상 증가한 정도의 잡음 감소 특성을 얻을 수 있었고 오버 샘플링 비를 증가시키지 않고도, 트랜스미터 출력 신호의 주파수 잡음을 10dB 이상 낮출 수 있었다. 또한, 전력 증폭기를 2진법으로 분할한 결과 다이나믹 영역이 5dB 정도까지 증가하는 효과를 얻었다. This paper presents a novel polar transmitter architecture with a 2-bit sigma-delta modulator. In the proposed architecture, the 2-bit sigma-delta modulator is introduced to suppress quantization noise of conventional sigma-delta modulator. The power amplifier configuration is also modified in a binary form to accommodate the 2-bit digitized envelope signal. The Ptolemy simulation results of the proposed structure show that the spectral property is greatly improved in full transmit band of EDGE system. The fine quantization scheme of the 2-bit modulator lowers the noise level by 10dB without increasing the over-sampling ratio, which may be obtained if the over-sampling ratio increases twofold. Dynamic range is also enhanced up to 5dB owing to the new form of the power amplifier in the transmitter.