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박강수,장수영,이응식,윤성기,Park, Kang-Soo,Chang, Su-Young,Lee, Eung-Shik,Youn, Sung-Kie 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.6
A study on the topology optimization of a multi-spectral camera for space-use is presented. The optimization is carried out under self-weight and polishing pressure loading. A multi-spectral camera for space-use experiences degradation of optical image in the space, which can not be detected on the optical test bench on the earth. An optical surface deformation of a primary mirror, which is a principal component of the camera system, is an important factor affecting the optical performance of the whole camera system. In this study, topology optimization of the primary mirror of the camera is presented. As an objective function, a measure of Strehl ratio is used. Total mass of the primary mirror is given as a constraint to the optimization problem. The sensitivities of the objective function and constraint are calculated by direct differentiation method. Optimization procedure is carried out by an optimality criteria method. For the light-weight primary mirror design, a three dimensional model is treated. As a preliminary example, topology optimization considering a self-weight loading is treated. In the second example, the polishing pressure is also included as a loading in the topology optimization of the mirror. Results of the optimized design topology for the mirror with various mass constraints are presented.
박강수 ( Park Gang Su ),안정근 ( An Jeong Geun ),김동진 ( Kim Dong Jin ),황윤회 ( Hwang Yun Hoe ),김형국 ( Kim Hyeong Gug ),박명환 ( Park Myeong Hwan ),강희동 ( Kang Hui Dong ),김도성 ( Kim Do Seong ) 한국센서학회 2003 센서학회지 Vol.12 No.1
Czochralski 법으로 조직등가 물질인 Li₂B₄O_(7) 단결정을 성장하고 열형과 특성을 조사하였다. 단결정 성장시 종자결정의 회전속도는 10 rpm, 인상속도는 0.18 mm-h^(-1) 이하에서 core가 없는 양질의 단결정을 얻을 수 있었으며, X-선 회절분석을 통해 성장한 Li₂B₄O_(7) 단결정의 구조는 정방정계임을 확인하였다. 열형광 glow 곡선은 쉽게 분해할 수 있는 세 개의 peak 들이 중첩되어 나타났으며, X-선에 대한 Li₂B₄O_(7) 단결정 TLD의 열형광감도는 50 mGy에서 1.5 Gy까지의 선량범위에서 선형적으로 나타났다. 기온율법에 의한 열형광 glow 곡선 분석과 PL 스펙트럼 분석 결과에 의한 glow peak의 활성화에너지는 각각 0.93, 1.78, 2.25 eV으로 평가되었다. Thermoluminescent properties of Li₂B₄O_(7) single crystal grown by Czochralski method have been investigated. The high quality Li₂B₄O_(7) single crystal without core was obtained at rotation speed of 10 rpm for seed crystal and pulling speed below 0.18 ㎜·h^(-1). The structure of Li₂B₄O_(7) single crystal was classified as tetragonal by XRD analysis. The TL glow curve was composed with three overlapped peaks which can be easily deconvoluted and the TL response of Li₂B₄O_(7) single crystal TLD to S-ray radiation is linear within the range of 50 mGy ~ 1.5 Gy. activation energies of three TL glow peaks analyzed by the various heating rates method and P spectrum were 093, 1.78 and 2.25 eV, respectively.
음이온 계면활성제를 사용한 modified Fenton 반응의 과수안정제 개발에 관한 연구
김한기(Kim Han Ki),박강수(Park Kang Su),김정환(Kim Jeong Hwan),박주양(Park Joo Yang) 대한토목학회 2011 대한토목학회논문집 B Vol.31 No.4B
본 연구에서는 modified fenton 반응에서 과산화수소를 안정화하여 오염토양 정화의 효과를 증대시키고자 하였다. 오염토양을 모사하기 위하여 PAHs 계열의 대표적인 오염물질인 phenanthrene을 사용하였다. 과수안정제로는 음이온 계면활성제인 SDS(Sodium dodecyl Sulfate)를 사용하였다. Modified Fenton 반응에서 phenanthrene의 제거율을 확인하기 위하여 Fe(Ⅱ) 4 mM, SDS 5~50 mM 및 H₂O₂ 102.897 mM를 phenanthrene 125 ㎎/㎏으로 오염된 토양에 주입하였다. 과수안정제인 SDS가 30 mM이 사용된 경우 phenanthrene의 제거 효율이 95%로 가장 높게 나타났으며 30 mM이싱에서는 시스템에서 SDS가 scavenger로 작용하여 오염물질의 제거효율이 SDS 30 mM 일 때 보다 낮게 나타났다. 과수안정제를 사용한 뒤 과산화수소의 농도변화를 분석한 결과 Fe(Ⅱ) 2 mM에서 48시간 이후 14.6995 mM 이상 남아있어서 가장 안정적이었지만, Fe(Ⅲ)을 주입한 경우에는 과산화수소가 안정화되지 않았다. Modified Fenton 반응에서 철과 SDS 농도 사이의 최적의 비율을 찾기 위하여 SDS의 농도는 30 mM로 고정하고 철의 농도를 2~8 mM로 변화시켜 실험한 결과 Fe(Ⅱ) 4 mM 및 SDS 30 mM에서 약 95%의 가장 높은 제거율을 보였다. In this study, hydrogen peroxide is stabilized in modified Fenton reaction to improve the soil remediation. Phenanthrene, which is the typical compound in PAHs, was spiked into soil samples to copy the original contaminated site. Anionic surfactant, SDS (Sodium dodecyl sulfate) was used for hydrogen peroxide stabilizer. 4 mM of Fe(Ⅱ), 5~50 mM of SDS and 102.897 mM of H₂O₂ was injected into soil samples which is contaminated by 125 ㎎/㎏ of phenanthrene to analyze decomposition rate of phenanthrene in modified Fenton reaction. In condition which SDS was injected 30 mM, decomposition rate of phenanthrene has best efficiency as 95% and in condition which SDS was injected over 30 mM, decomposition rate is lower than SDS 30 mM because SDS enacted as scavenger in the system. Results which assess the change of hydrogen peroxide concentration after injecting hydrogen peroxide stabilizer showed that hydrogen peroxide concentration was 14.6995 mM so that is stabilized at Fe(Ⅱ) 2 mM condition in 48 hours. On the other hand, hydrogen peroxide is not stable in Fe(Ⅲ) condition. SDS concentration was fixed and iron concentration was changed 2~8 mM to find out optimize proportion between iron concentration and SDS concentration in modified Fenton reaction. Consequentially, in condition of which Fe(Ⅱ) 4 mM and SDS 30 mM, reaction has the highest removal rate as 95%.
신보성(Bo-sung Shin),박강수(Kang-su Park),박연경(Yeon-kyoung Bahk),고정상(Jeung-sang Go) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
It is well known that abrasive waterjet (AWJ) was developed a kind of high-density energy processing technologies. AWJ is used to obtain the better cutting quality of various materials such as metals, ceramics, glass and composite materials within a short manufacturing time because of the characteristics of heatless and noncontact processing. However AWJ have still been some difficulties to improve the quality of thin workpiece. In this paper, we investigate the optimal microcutting conditions of AWJ, such as maximum pressure, cutting speed and standoff distance, of thin multi-layered materials. The experimental results show that AWJ have possibilities and potential to apply to the microcutting of thin multi-layered materials for IT industrial applications.
이대행,김민희,박옥현,박강수,안상수,서희정,진승현,정원삼,강영주,안기완,김은선,Lee, Dae-Haeng,Kim, Min-Hee,Park, Ok-Hyun,Park, Kang-Soo,An, Sang-Su,Seo, Hee-Jeong,Jin, Seung-Hyun,Jeong, Won-Sam,Kang, Yeong-Ju,An, Ki-Wan,Kim, Eun-Sun 한국환경보건학회 2013 한국환경보건학회지 Vol.39 No.3
Objectives: A great number of people visit forests for their bountiful healing factors. We investigated the quantity of terpene and analyzed the correlations with meteorological and environmental factors at Mt. Mudeung in order to support public health. Methods: The terpene amounts were investigated along 11 main trails using stainless steel tube packed by Tenax TA (150 mg) and Carbopack B (130 mg) during March to November 2012. Terpene amounts of 20 species (${\alpha}$-pinene, camphene, etc.), and meteorological and environmental factors were investigated in the field. Results: Terpene of 16 species was released from the forest and total terpene amounts were 2,080 pptv at the site of Chamaecyparis obtusa, the highest among 11 sites, nearby the first reservoir on Mt. Mudeung. Terpene concentrations in the forest were nine to 23 times higher than found in urban areas. Total terpene amounts had positive correlations with temperature, humidity, carbon dioxide and oxygen (p<0.01) with $R^2$ of 0.345, 0.369, 0.591, 0.145, respectively, from April to July. Wind speed and solar radiation in the forest had a negative correlation with terpene amounts and showed statistical insignificance with p-values of 0.118 and 0.233, respectively. Conclusions: This study suggests that the amounts of terpene around Mt. Mudeung are indeed higher, so visitors may enjoy a therapeutic walk in the forest with a healing effect. These results showed the forest was very effective for improving human health.