• Analytical Science and Technology
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• v.24 no.4
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• pp.282-289
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• 2011

Rapid screening method for the determination of the emissions of pollutants from vehicle interior parts and materials have been developed as ISO 12219-2 which is using bag and based on a static condition. The method was not controlled humidity in the test bag, so it is not suitable test method for formaldehyde emission test which is highly related to humidity condition. In this study, possibility of control humidity in the static test bag by adding extra water and the effect of humidity condition for formaldehyde emissions have been investigated. The relative humidity in the test bag was affected not only amount of water added also material of test bag and test specimen. The emission intensity of formaldehyde was increased according to increasing relative humidity in test bag. But excessively supplied water was condensed on the inner surface of test bag and surface of sample specimen that were sorption formaldehyde and were reduced its emission intensity.

• Journal of the Korea institute for structural maintenance and inspection
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• v.20 no.2
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• pp.40-48
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• 2016

To observe the rail-slab interaction in continuous welded railway(CWR) bridge when earthquake occurs, additional axial rail stresses and relative longitudinal displacements between rail and bridge deck were calculated with input of various load combinations and 3 different types of seismic loads to an analytical model. As results of analysis, it can be found that standard response spectrum proposed by Korea Rail(KR) network authority for earthquake design showed less additional axial rail stresses than allowable levels, but greater relative longitudinal displacement between rail and bridge deck, which means that adjustment of relative longitudinal displacement within a standard level is much more difficult than axial train stress. Additionally, if a large-scaled earthquake as occurred at Kobe, Japan comes up, then both of additional axial rail stress and relative displacement in rail-bridge deck may exceed allowable levels, which indicates to make proper design guides against sudden earthquake occurrence.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.36 no.9
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• pp.1033-1039
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• 2012

Artificial joints are used when joints lose their function because of either the destruction or damage of the composing bones of the joints. To evaluate the primary stability of a femur-implant system, the relative displacement caused by a repeated load is measured immediately after the insertion of the artificial joint. For more accurate stability evaluation, the accurate measurement of the penetration displacement of the artificial joint to the bone and the rotation angle of the artificial joint is essential. In this study, to evaluate the primary stability of the femur-implant system, we propose a new relative displacement measurement method. By using this new method, we comparatively evaluate the primary stability for various surgical methods and the varying stiffness of the cadaver femur-implant itself.

• Communications for Statistical Applications and Methods
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• v.16 no.4
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• pp.627-637
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• 2009

Our economic system highly depends on the international trade market and demands high level of foreign language abilities to the young generation. Scores of various internationally authorized language tests are used to estimate students's language ability before giving their admission to universities or high schools. According to increase of unemployment rate of the young people, universities put their strength on the language abilities of their students, and each university uses some authorized language scores before determining students who win scholarships. This study suggests two types of indices to evaluate students's relative achievement of foreign language abilities between two time points considering their current abilities. One, named one-side relative achievement index, is defined as the ratio of additional score between two time points to the remaining score at the base time point to the full score. The second one, named two-side relative achievement index, is defined as the same manner as the first one if the score is improved, and if not, is defined as the ratio of the amount of losing scores to the current score at the base time point. Two-side achievement index is more useful since it has smaller variation than the former and is easier to interpret. However, both indices are useful to compare the achievements of different tests.

• Economic and Environmental Geology
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• v.42 no.1
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• pp.73-84
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• 2009

The stone Buddha and Shrine of Unjusa temple (Korean Treasure No. 797) at Hwasun formed in Koryo Dynasty is unique style which faces each other the back parts of south and north within the stone Shrine. The stone Buddha and Shrine is highly evaluated in historical, artistic and academic respects. But, the stone properties have been exposed in the open system various aspects of degradations weathered for a long time without specific protective facilities. To inquire into relative deterioration and environmental factor, air temperature and relative humidity of the stone Buddha and Shrine were monitored for a year of the indoor and outdoor, respectively. As a result, the temperature shows increase and decrease according to the seasons in the tendency to clear. While the relative humidity is high to keep all four seasons. Highly relative humidity environment induces dew condensation on the interior of stone Buddha and Shrine. The dew condensation is recorded at the spring, summer and winter season. The summer season is double the total of spring and winter season. In the case of summer, dew condensation is long time continued due to high temperature and relative humidity that is kept by more than nearly 100%. There is progress towards chemical weathering throughout dissolve rock properties and alteration on the rock surface. In the case of winter, dew condensation is not kept for a long time as summer. In the winter, which showing a below zero may add physical weathering throughout moisture that happen by dew condensation to repeat freezing and thawing. Therefore, the reduction plan of the relative humidity effect on dew condensation should be prepared.

• Journal of Information Technology Application
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• v.3 no.1
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• pp.51-76
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• 2001

최근 몇 년간 인터넷 네트워크상에서 운영되는 가상 기업이 늘어나고 있다. 그러나 이러한 발전과 더불어 많은 가상 기업의 실패 위험률 또한 성공률의 두 배를 웃돌 정도로 매우 높다. 본 논문은 기존 일반기업 평가 기준, 정보시스템 평가 기준 및 전자상거래 평가 기준의 틀 위에서 가상성이 동일한 가상 기업들을 비교 평가하기 위한 평가 기준을 AHP 분석 기법을 활용하여 제시하였다. 이들 평가 기준은 크게 이해관계자 집단의 상대적중요도와 경영적 측면(managerial aspect), 그리고 정보적 측면의 상대적 중요도의 2단계로 분류되었으며, 제2단계는 다시 다용인 평가를 하였다. 이 방법의 현실성을 보이기 위해 세 개의 공급사슬 형태의 가상 기업에 대해 비교 평가를 실시하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.11a
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• pp.945-948
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• 2005

현재 침입탐지시스템(IDS:Intrusion Detection System)은 다양한 평가요소들 - 탐지율, 오탐율, 새로운 공격탐지능력, 안정성 등을 기준으로 평가되고 있고, 이러한 결과는 제품의 보호수준을 결정하거나 한 조직의 정보보호장치로 적합한지를 평가하는 벤치마킹테스트의 방법으로 활용된다. 그러나, 이러한 평가의 결과는 조직의 침입탐지시스템을 구축하고자 하는 네트워크 환경하에서 각각의 침입탐지시스템이 갖는 특성에 따라 상대적인 평가는 가능하나 해당 조직의 네트워크 인프라와 위협요소, 취약점을 고려했을 때 보다 최적의 것이 무엇인지를 평가하는 방법으로는 한계가 있다. 그러므로, 본 연구논문에서는 이러한 한계를 극복하기 위한 방법으로서 조직의 정보보호 위험분석에서 도출된 해당 네트워크 환경의 자산, 위협, 취약성의 결과인 위험과 위험수준을 IDS 평가에 반영하여 조직의 환경하에 보다 적합한 침입탐지시스템 선정이 가능한 평가방법을 제안한다.

• Journal of the Korean Society for information Management
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• v.20 no.1
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• pp.401-416
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• 2003

This study examined weight techniques for applying to DB evaluation This study, then analyzed DB evaluation criteria in terms of category, content, and business model. Finally, it showed the use example of AHP technique to rank the important evaluation factors. These results will be used to evaluate factors which we significant in determining how well the given DB is appropriate in your environment.

• Journal of the Korean Association of Geographic Information Studies
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• v.16 no.4
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• pp.153-170
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• 2013

This study was conducted to analyze the thermal comfort in the urban neighborhood park and to obtain a plan for improvement of the thermal environment. First, in the result of the analysis of the distribution characteristics of the park's main thermal environment factors and differences among types of space, temperature, relative humidity, and wind speed did not show a clear difference spatially. However, the median radiant temperature showed great differences according to the openness of the space and the covering material. According to the evaluation of thermal comfort by types of space based on derived thermal environmental factors, the PMV value of the square was the highest at 4.39, the paths showed 2.58, greenery 1.90, and resting spaces 0.42. In the result of the PMV regression model established for the evaluation of the significance of these thermal environment factors that decide thermal comfort, it showed that the relative significance to the PMV was as follows in decreasing order: median radiant temperature(1.084), wind speed(-0.280), temperature(0.013), and relative humidity(-0.009). When conducting a scenario analysis on the areas with need for improvement in thermal environment, it was found that through reflectivity, color and the change in the physical properties of packing materials the thermal comfort felt by the body could be improved, and it is believed that through this the improvement plan can be established.

• Journal of the Korean Geotechnical Society
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• v.32 no.4
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• pp.41-49
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• 2016

Pile foundations used as offshore support structures are dominantly subjected to cyclic lateral loads due to wind and waves. In this study, a series of cyclic lateral load tests were performed on a pre-installed aluminum flexible pile in sandy soil with three different relative densities (40%, 70% and 90%) in order to evaluate the effect of cyclic lateral loads on lateral load capacity of a pile. The cyclic lateral loads increased the lateral load capacity of a pile at 40% relative density, whereas they decreased it at 70% and 90% relative densities. This can be explained by the fact that the cyclic lateral loads slightly densified the surrounding soil in relatively loose sand (40%), while the surrounding soil was disturbed in relatively dense sand (70% and 90%). These effects were more obvious as the cyclic lateral load amplitude increased, being independent with the saturation. Also, from the test results, an empirical equation for the lateral load capacity of a cyclic laterally loaded pile in sandy soil was developed in terms of relative density of the soil and the cyclic lateral load amplitude.