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침전반응법으로 합성한 수산아파타이트 분말의 중금속 흡착 특성 및 폐수중의 유해 금속 제거제로서의 유용성
이무성,나춘기,이미숙,김옥배,김문영,Lee, Mu Seong,Na, Choon Ki,Lee, Mi Suk,Kim, Oak Bae,Kim, Moon Young 대한자원환경지질학회 1995 자원환경지질 Vol.28 No.3
It is well known that hydroxyapatite [$Ca_{10}(PO_4)_6(OH)_2$] have an exchangeability for various heavy metal ions in aqueous solution. To evalute the feasibility of employing the synthetic hydroxyapatites as an eliminatable exchanger for environmentally noxious caions in waste water, the adsorption properties, the removal capacities and the selectivity of the apatites for various cations were investigated in more detailed. The heavy metal cations have been exchanged in calcium part of hydroxyapatite. The order of the degree of amount exchanged of the investigated cations is $Pb^{2+}>Cd^{2+}>Zn^{2+}>Ba^{2+}$. The molar ratios between released $Cd^{2+}$ ions and remeved divalent metal cations in the reacted solution with hydroxyapatite are roughly close to an integer 1.0, suggesting that an ion-exchange reaction could have played a major role in the removal of heavy metals rather then an adsorption effect. The exchangeability of the hydroxyapatite powder of Ca/P molar ratio 1.67, which have specipic surface area of $104.5m^2g^{-1}$, appeared to be better then $237.6{\mu}g$ per g for $Pb^{2+}$ ions. The removal capacity of the heavy metal ions varies directly as particle size of hydroxyapatites. All evidences obtained indicate that the synthesized hydroxyapatite powders by precipitation reaction method can be employed as an effective cation exchanger for eliminating noxious ions in waste water even in some improvemental.
이무성(Lee Mu-Seong),이범관(Lee Beom-Gwan) 한국지적학회 2003 한국지적학회지 Vol.19 No.2
본 연구의 목적은 필지 변동이 어떤 유형과 원칙을 가지고 변동하는가를 규명하는데 있다. 이상의 연구목적을 효율적으로 달성하기 위한 시간적 범위는 1910년부터 현재까지로 하고, 공간적 범위는 대구광역시 동구를 중심으로 하며, 내용적 범위는 필지를 구성하고 있는 여러 요소 중 필지의 수·면적·지목모양을 중심으로 하며, 연구방법으로 필지 수·면적·지목에 대한 연구는 문헌조사법과 사례조사법을 사용하였다. 분석 결과 첫째, 필지 수는 도시화가 진행되는 동안은 시간에 비례하여 증가하는 모형으로 나타났으며 둘째, 일 필지당 면적은 시간에 반비례하여 감소하는 모형으로 나타났다. 셋째, 지목은 1차산업형 지목과 농촌형 지목에서 3차산업헝 지목과 도시형 지목으로 변경되는 것으로 나타났다. 넷째, 필지의 모양은 곡선에서 직선으로, 폐합된 곡선이나 부정형에서 정방형이나 장방형으로 변동되는 것으로 나타났다. The purpose of this study is to determine the patterns and principles dictating the land parcel changes. For this purpose, the time span was set from 1910 to present, the scope of study was limited to Dong-gu of Daegu metropolitan city, and the contents of study were restricted to number. area, category and shape of land parcels among a variety of elements. The methods of study used were literature review and case study for number, area and category of land parcels, As a result of analysis, the following conclusions were drawn; First, the number of land parcels has increased over time. Second, the area per land parcel decreased over time. Third. the categories of land parcels have changed from the primary industrial uses such as farms to the tertiary industrial uses and urban uses. Fourth. the shape of land parcels has changed from curved to linear ones or from closed curves or indeterminate ones to squares or rectangles.
이성철(Lee Seong Cheol),현무성(Hyeon Mu Seong),이세호(Lee Se Ho) 한국사회체육학회 2003 한국사회체육학회지 Vol.20 No.2
The objective of the study is to analyze offensive performance in the game of soccer to improve the scoring success ratio in the scoring zone. To accomplish the purpose of this study, analyze the graphic data gathered from the output of sportsdatabank(Inc.) soccer information system developed in 2000. The basic distinctive quality of this data is developed to grope for analyzing the offensive power in the base of spatial division in the soccer ground. The purpose of this study was to identify the analysis of offensive power in the area of the scoring zone. More specially, the study aimed: (1) to analyze the trial of ball passing into the scoring zone (2) to analyze the success ratio of ball passing into the scoring zone (3) path of the shooting in the scoring area. Through this new study, all the results of offensive power in the scoring zone can be found output data meaningfully to explain the situation of the offensive play competence in the scorng zone in comparision with the data gathered from former analytic method. Efficiency of this new spatial analysis of offensive performance in the scoring zone of the soccer groud is proved to be very useful in many different offensive performance in the soccer related fields.
장무성(Mu Seong Chang),최병오(Byung Oh Choi),강보식(Bo Sik Kang),박종원(Jong Won Park),이충성(Choong Sung Lee) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.9
대부분의 제품은 다수의 고장모드를 가지지만, 일반적으로 신뢰성 분석에서 고장모드 별로 분석하는 경우는 많지 않다. 또는 신뢰성 분석 시 고장모드에 대한 정보를 제공하지 않거나 대표적인 고장모드로 분석하기도 한다. 특히 신뢰성 인증시험에서 가정하고 있는 형상모수는 제품의 형상모수보다는 고장모드에 대한 형상모수 값이 더 중요하다. 본 연구에서는 다수의 고장모드를 가지는 기계부품에 대한 신뢰성 분석방법으로 경쟁 고장모드 분석방법과 혼합 와이블 분석방법을 소개한다. 그리고 3 가지 고장모드를 가지는 공기압 실린더의 사례에 대해 각 고장모드 별로 형상모수를 구하였으며, 3 가지 고장모드를 고려했을 때와 하나의 고장모드로 가정했을 때의 신뢰성 측도(B10 수명, 특성 수명)을 비교하였다. Most products are indeed governed by multiple failure modes. However, there are few cases in which reliability analysis applies to only one failure mode at a time. Furthermore, reliability data do not include information about failure modes, or the reliability analysis is performed using a representative failure mode. The Weibull shape parameter for failure modes is more important than one for products in the reliability qualification test. This paper presents reliability analysis methods for a mechanical component with multiple failure modes. These methods include the competing failure modes (CFM) method and the mixed Weibull method. Pneumatic cylinder test data with three failure modes are presented to estimate the shape parameter for each separate failure mode. In addition, reliability measures (B10 life, characteristic life) of the pneumatic cylinder considering three failure modes were compared with those assuming a single failure mode.