• 대한방사선기술학회지:방사선기술과학
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• 제1권1호
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• pp.55-59
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• 1978

The photographic characteristics have been studied in relation with various molecular weights of Polyvinylpyrrolidone(PVP). The shape of silver halogen crystals by physical ripening of mixture of photographic gelatine and various molecular weights of PVP were observed. Then, the photographic characteristics have been studied by chemical ripening. Results were concluded as follows: 1. All of the crystals have formed in the shape of (100) or (111). 2. Photographic characteristics were inferior by using PVP of higher molecular weight. 3. Photographic characteristics were superior by using PVP of lower molecular weight. 4. Photographic characteristic were compared with various Emulsion thickness and Tested Resolving power.

• 한국공간구조학회논문집
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• 제8권4호
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• pp.57-64
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• 2008

본 연구는 설치와 해체가 용이하여 간이식 구조에서 활용되는 시저스 전개형 구조에 관한 것으로, 입면상의 곡률변화 방법을 고찰하고 그에 따른 구조특성을 파악하고자 한 것이다. 먼저 시저스 구조의 입면상 곡률과 시저스부재의 내부절점 편심거리와의 관계를 식과 그래프를 이용하여 나타내었다. 이에 따라, 동일한 시저스부재에서 내부절점 편심거리를 조절하여 곡률을 변화시킬 수 있는 해석모델을 고찰함으로써, 곡률변화에 따른 시저스 구조부재들의 구조적 특성을 고찰하였다. 또한 고찰된 구성방식에 근거하여 실 모델을 제작하고 전개과정을 살펴봄으로써 실제 전개가능성을 검토하였다.

• 정보처리학회논문지D
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• 제13D권4호
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• pp.619-624
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• 2006

현재 국내 게임시장은 급속도로 발전하고 있으나 게임제작 프로세스는 체계화 되지 못하고 있다. 또한 게임기획자와 게임개발자 간의 의사 소통의 문제점은 게임의 실패를 초래 하고 있다. 본 연구는 게임기획자와 게임개발자 간의 원활한 의사소통을 위하여 게임기획을 위한 산출물에서 게임의 특성을 표현하는 요소를 추출하여 클래스화 하고, 추출된 요소간의 관계를 나타내기 위하여 클래스의 연관관계를 제시한다. 사례 연구를 통해 추출된 클래스와 클래스간의 연관관계를 파악하여 체계적인 게임기획을 지원한다.

• 복식
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• 제51권7호
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• pp.93-109
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• 2001

Fashion photographs from leading monthly fashion magazines in 1960s and 1990s were analyzed here. The formative feature characteristics of domestic minimalism fashion were studied. The major conclusions of the study are as follows 1. The formative feature characteristics of minimalism were expressed as simplicity, minimum, repetition, and futurism. 2. The formative feature characteristics of domestic minimalism fashion were expressed as simplicity, minimum, repetition, and futurism in silhouette, shape, detail, trimming, materials, patterns and color. 3. Minimalism in art and domestic fashion were identified to have a relation in the characteristics of formative feature. In shape and color. simplicity and minimum showed analogy while repetition and futurism showed difference. 4. Simplicity and minimum were expressed in both domestic and foreign minimalism fashions, but repetition and futurism were less expressed in domestic fashion.

• Journal of Advanced Marine Engineering and Technology
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• 제28권3호
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• pp.531-537
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• 2004

In this paper, the static and dynamic characteristics in the sensor tube of a mass flow controller(MFC) were studied by experiments. In the sensor tube of MFC. the difference of temperature between inlet and outlet was necessary for calculating the mass flow rate. Therefore, the relations among flow rate, heat generated by heating wire. and sensor location were investigated to find optimized condition. Finally, the relation between sensor voltage through analog digital conversion(ADC) and flow rate in the sensor tube can be represented. Based on this study, static and dynamic characteristics of sensor tube can be used for design of mass flow controller.

• 한국자동차공학회논문집
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• 제15권3호
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• pp.72-78
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• 2007

A diesel particulate filter causes progressive increase in back pressure of an exhaust system due to the loading of soot particles. To maintain the pressure drop caused by DPF under proper level, a regeneration process is mandatory when excessive loading of soot is detected in the filter. It is a major reason why the relation between the amount of soot and the pressure drop in a DPF becomes crucial. On the other hand, pressure drop varies with not only the soot loading but also conditions of exhaust gas such as mass flow rate. Therefore, the relation among them becomes complicated. Furthermore, the characteristics of heat transfer in a DPF is another crucial parameter in order for the filter to avoid thermal crack during regeneration period. This study presents characteristics of pressure drop under various conditions of soot loading and mass flow rate in catalyzed diesel particulate filter. This study also shows characteristics of heat transfer in DPF when high temperature gas flows into the filter. Experiments reveal that the soot loading and mass flow rate affect characteristics pressure drop independently. Experiments also indicate that the amount of coating material has little influence on pressure drop with changes in soot loading and mass flow rate. However, increased catalyst coating may lead to the improved heat transfer which is efficiency to reduce thermal stress of the filter.

• 한국해양공학회지
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• 제30권6호
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• pp.505-519
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• 2016

If the seabed is exposed to high waves for a long period, the pore water pressure may be excessive, making the seabed subject to liquefaction. As the water pressure change due to wave action is transmitted to the pore water pressure of the seabed, a phase difference will occur because of the fluid resistance from water permeability. Thus, the effective stress of the seabed will be decreased. If a composite breakwater or other structure with large wave reflection is installed over the seabed, a partial standing wave field is formed, and thus larger wave loading is directly transmitted to the seabed, which considerably influences its stability. To analyze the 3-D dynamic response characteristics of the seabed around a composite breakwater, this study performed a numerical simulation by applying LES-WASS-3D to directly analyze the wave-structure-soil interaction. First, the waveform around the composite breakwater and the pore water pressure in the seabed and rubble mound were compared and verified using the results of existing experiments. In addition, the characteristics of the wave field were analyzed around the composite breakwater, where there was an opening under different incident wave conditions. To analyze the effect of the changed wave field on the 3-D dynamic response of the seabed, the correlation between the wave height distribution and pore water pressure distribution of the seabed was investigated. Finally, the numerical results for the perpendicular phase difference of the pore water pressure were aggregated to understand the characteristics of the 3-D dynamic response of the seabed around the composite breakwater in relation to the water-structure-soil interaction.

• 환경위생공학
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• 제14권4호
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• pp.85-92
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• 1999

Indoor air quality tends to be the dominant contributor to personal exposure because most people spend over 90% of their time indoors. For some contaminants, exposure to indoor air poses a potentially greater health threat than outdoor air exposures. Indoor nitrogen dioxide ($NO_2$) levels are mainly affected gas range, flue gas spillage, kerosene heaters, wood-burning appliances and cigarette smoke. In addition, indoor $NO_2$ levels are influenced by such house characterization as surface reaction and air exchange rate. In this study, the measurements of indoor and outdoor $NO_2$ concentrations were taken using identical protocols, and information was collected on housing characteristics using identical questionnaires in 14 houses out of 15 houses for daily 30 daily 30 days in Brisbane, Australia.The usage of gas range was the most contributing factor in indoor $NO_2$ concentration in relation to house characteristics. Average indoor and outdoor ratios of NO2 concentration in electronic and gas cooking houses were $0.6{\pm}0.1$ and $0.9{\pm}0.2$, respectively. The frequency distributions of $NO_2$ concentration in each house were approximately log-normal Geometric mean of indoor $NO_2$ concentrations of electronic and gas cooking houses for daily 30 days ranged from 2.5 ppm to 11.5 ppm with a mean 6.8 and from 4.7 ppm to 28.6 ppm with a mean 15.6 ppm, respectively. The $NO_2$ concentrations between electronic and gas cooking houses were significantly different (p<0.05). Since each house has different life-style and house characteristics, sampling interval to measure the $NO_2$ levels was recommended above 7 days.

• 기본간호학회지
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• 제8권1호
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• pp.35-50
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• 2001

The purpose of this study was to identify the perception of hospice nurses on suffering, the type of stracture and characteristics of suffering. The research process is followed : First, the researcher selected 35 statements on suffering using content analysis of in-depth interviews and a literature search Second, the researcher asked 38 hospice nurses to classify the statement cards. The result of the research showed that the hospice nurse's perception of suffering can be divided into 4 types (Self-recognition, Suffering-elimination, Relation-restoration, and Meaning-endowment). The total explained variance was 46 percent. In relation to this, nursing intervention skills could be presence, listening touch, hope, reassurance, and comforting which result in positive effects between nurse and hospice client.

• 한국정밀공학회지
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• 제5권3호
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• pp.20-30
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• 1988

Using the design parameters of multi-joint manipulator, worspace of the manipulator were evaluated analytically, and the relation between such design parameters and nonlinearity of the manipulator were presented dynamically. The ratio of the volumes of a manipulator's workspace to the cube of its total link length presents a kinematic performance index [NVI] for the manipullator. It is possible to geometrically represent the manipulator dynamics with the generalized inertia ellipsoid (GIE). The relation between the GIE configuration and the characteristics of manipulator dynamics was analysed in terms of inertia and nonlinear forces (Coliolis and centrifugal forces). The nonlinearity caused by the change of the GIE configuration were affected by the difference between the major and minor axes length of the GIE. The results of this investigationare applied to the optimal design of the manipulator.