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Design sensitivity analysis of a Stockbridge damper to control resonant frequencies
김찬중 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.9
A Stockbridge damper system can control the aeolian vibrations in a transmission line by dissipating excitation energy through the self-excitation of the damper system. Therefore, locating these resonant frequencies is a critical design consideration for a Stockbridge damper to determine the efficiency of spectral energy dissipation. In this study, the design strategy of a damper was investigated after conducting a design sensitivity analysis of the resonant frequency of a Stockbridge damper that considered several design parameters, including length of the messenger wire, inertia of the counterweight, and gyration radius of the counterweight. The formulation of the design sensitivity analysis was performed using partial derivatives of the eigenvalues with respect to each design parameter over two resonant frequencies. The sensitivity formulations were validated through a case study of eigenvalues that considered a variation of up to ±30 % in the values of the design parameters. The design guidelines for a Stockbridge damper were derived from the sensitivity analysis results.
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김찬중 충북연구원 2003 지역정책연구 Vol.14 No.1
The main purpose of this study is to classify the major trend on study of the knowledge management, to confirm the criteria on success of the knowledge management and to find the critical success factors of knowledge management through the literature review on antecedent study of the knowledge management. More than thirty-two major studies on the knowledge management were deliberately selected and interpret!vely analyzed to reach the above aim of this study. As a result of the analysis, what have been found are as follows. First, the two major trend of study on the knowledge management were knowledge creation - oriented approach and knowledge management system -oriented approach. Second, the success criteria of knowledge management were financial and non-financial perspective, especially BSC(Balanced Scorecard) reflected both the perspectives, and so BSC was useful tool of measure on the knowledge management. Third, the critical success factors of knowledge management were found in order of ©tool of knowledge management, ②openness of organizational culture and the degree of top management's awareness on knowledge management, ③creativity of organizational culture, ©reward system and ©organizational structure. -
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김찬중 한국유변학회 1995 Korea-Australia rheology journal Vol.7 No.3
폴리우레탄 미세포 포움의 가공에 대한 연구를 수행하였으며 기체 과포화 수지 내 의 핵생성율을 증진시키기 위하여 폴리올과 이소시아네이트의 혼합물에 초음파 가진을 적용 하였다. 미세포 구조는 고압에서 질소 가스로 폴리올을 과포화ㅣ키고 폴리우레탄의 두 성분 을 충돌혼합시킨 직후 초음파에 의해 기포를 생성시켜 이루어진다. 낮은 포화 압력에서 질 소에 의해 포화된수지의 핵생성율을 증가시키기위하여 초음파 가진을 적용하였다. 확산에 의해 기포의 성장이 조절된다고 가정하고 금형이 충전되는 동안에 금형 내부에서의 기포성 장기구를 이해하기 위하여 수치적인 방법으로 이론적 연구를 수행하였다. 경화 시간과 확산 경계를 고려하여 최종적인 기포의 크기를 계산하였으며 반응속도론을 고려하여 중합반응 동 안의 폴리우레탄의 점도의 변화를 예측하고 경화 시간을 결정하였다. 이론적 및 실험적으로 결정된 기포의 수를 기준으로 하여 확산 경계를 예측하였다.
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김찬중,조준희 한국산업경제학회 2011 산업경제연구 Vol.24 No.5
본 연구의 주된 목적은 윤리경영과 구성원의 직무태도의 관계를 규명하는 것이다. 구체적으로는 윤리경영(최고경영자의 의지, 윤리경영시스템, 윤리경영교육, 윤리경영평가, 대외적 윤리 활동)이 직무태도(직무만족, 조직몰입)에 어떠한 영향을 미치는지, 그리고 이들 사이에서 조직신뢰가 조절변수로 작용하는지 등을 확인하는 것이다. 이러한 연구목적을 달성하기 위하여 전사적 차원에서 윤리경영을 시행하고 있는 국내 5개 기업의 종업원 312명을 대상으로 실증분석을 수행하였다. 연구결과 첫째, 윤리경영교육은 직무만족에 정(+)의 영향을 미치는 것으로 확인되었고, 둘째, 최고경영자의 의지, 윤리경영평가는 조직몰입에 정(+)의 영향을 미치는 것으로 확인되었으며, 셋째, 윤리경영과 직무만족, 윤리경영과 조직몰입간의 관계에서 조직신뢰의 조절효과는 발견되지 않았다. 그리고 이러한 연구결과를 바탕으로 효과적인 윤리경영에 필요한 경영전략적 시사점을 제시하였다. The main purpose of this study is to examine the relationship between business ethics and job attitude of employees. Concretely, it is confirmed how influence of business ethics(will of CEO, business ethics system, education of business ethics, evaluation of business ethics, external activity of business ethics) on job attitude(job satisfaction, organizational commitment) and whether there is a moderating effect of organizational trust between business ethics and job attitude. For the purpose of this study’s goal, the 312 samples for this empirical study is collected from domestic employees of 5 different companies executing ethical management. The results of this study are as follows. First, there is a positive effect of education of business ethics on job satisfaction. Second, there are positive effects of will of CEO and evaluation of business ethics on organizational commitment. Last, there is no moderating effect of organizational trust between ethical management and job attitude of employees. Based on the results of this study, we suggested implications for business strategy and effective alternatives for ethical management.
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저 순도 BaCO<sub>3</sub> 분말을 사용한 Yba<sub>2</sub>Cu<sub>3</sub>O<sub>7-y</sub> 초전도체의 합성
김찬중,박순동,최정숙,전병혁,문종백,이상헌,성태현,Kim, Chan-Joong,Park, Soon-Dong,Choi, Jung-Suk,Jun, Byung-Hyuk,Moon, Jong-Baik,Lee, Sang-Heon,Sung, Tae-Hyun 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.1
[ $YBa_2Cu_3O_{7-y}$ ](123) powders were synthesized by the solid state reaction method using two different purity $BaCO_3$ powders (99.75% and 99.7% purity) and $Y_2O_3$ (99.9%) and CuO (99.9%) powders. The effect of $BaCO_3$ purity on the formation of a 123 phase and the superconducting properties were investigated. The mixtures of raw powders were calcined at temperature ranges of $800^{\circ}C-880^{\circ}C$ in air and finally made into a single grain samples by a melt processing with top seeding. It was found that a 123 phase was well formed at temperature above $870^{\circ}C$, but the purity effect on the 123 formation was negligible. The single-grain 123 samples prepared from the different $BaCO_3$ powders showed the same $T_c$ value of 90.5 K and similar $J_c$ values about $10^4\;A/cm^2$ at 0 T and 77 K, and $10^3\;A/cm^2$ at 2 T and 77 K. This result indicates that the low purity, cheap price $BaCO_3$ powder can be used as a raw material for the fabrication of single-grain, high-$J_c$ superconducting levitator.
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Superconductivity of Ce$O_2$-added Y-Ba-Cu-0 Superconductors Prepared by Partial Melt Process
김찬중,김기백,이규원,원동연,Kim, Chan-Joong,Kim, Ki-Baik,Lee, Kyu-Won,Won, Dong-Yeon Materials Research Society of Korea 1992 한국재료학회지 Vol.2 No.3
$CeO_2$를 첨가한 Y-Ba-Cu-0 초전도체를 포정반응을 포함한 준용용법으로 제조하여 미세조직과 초전도성을 관찰하였다. 첨가한 $CeO_2$는 포정반응중에 $BaCeO_3$로 변화하였으며, 이 $BaCeO_3$는 방향성 성장한 1-2-3 초전도상의 기지에 미세하게 분산된다. 초전도체의 $T_{c}$는 첨가된 $CeO_2$함량에 관계없이 90K 이상으로 매우 높았다. 이는 준용융공정을 적용함으로서 제2상물질을 초전도상으로부터 분리할 수 있었기 때문으로 사료된다. The $CeO_2$-added Y-Ba-Cu-O oxides were prepared by the partial melt process involving the peritectic reaction, liquid + 2-1-1 phase ${\rightarrow}$ 1-2-3 phase, to investigate the effect of the dopant on microstructure and superconductivity. During the peritec reaction, all the added $CeO_2$ was converted to $BaCeO_3$ particles which were finely dispersed in large 1-2-3 grains. Superconducting transition temperature($T_{c}R=0$ point) of the partial-melted samples was as high as 90K regardless of $CeO_2$ content up to 5wt%, which is owing to the separation of the second phase from the 1-2-3 superconducting phase.
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