• 한국지하수토양환경학회지:지하수토양환경
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• 제25권3호
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• pp.52-64
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• 2020

The universal soil loss equation (USLE), a model for estimating the potential soil loss, has been used not only in research areas but also in establishing national policies in South Korea. Despite its wide applicability, USLE cannot adequately address the effect of seasonal variances. To overcome this limit, the ArcGIS-based Sediment Assessment Tool for Effective Erosion (ArcSATEEC) has been developed as an alternative model. Although the field-scale (< 100 ㎡) application of this model produced reliable estimation results, it is still challenging to validate accuracy of the model estimation because it only estimates potential soil losses, not the actual sediment yield. Therefore, in this study, a method for estimating actual soil loss based on the ArcSATEEC model was suggested. The model was applied to eight watersheds in South Korea to estimate sediment yields. Correction factor was introduced for each watershed, and the estimated sediment yield was compared with that of the estimated yield by LOAD ESTimator (LOADEST). Sediment yield estimation for all watersheds exhibited reliable results, and the validity of the proposed correction factor was confirmed, suggesting the correction factor needs to be considered in estimating actual soil loss.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2009년 춘계학술발표대회 논문집
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• pp.155-160
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• 2009

Safety of residents could be considered and then increased when we plan, design, and operate a city. In Korea, CPTED (Crime Prevention through Environmental Design) is currently being applied to new towns. However, it is not systemized and neither efficient, for there are no constraint provisions, and the foreign cases are not specifically customized to the current situation of the country. This means, the introduction of CPTED is an indispensable fact, but there are limits to the budget aids and actual application, for there is no legal base to support it. This study, therefore, aims to find the limits from analyzing related laws and regimes, administrative regulations, and applied cases, and to deduct improvement plans based on examined foreign cases. In this Study, the supporting system of foreign CPTED related laws and regulations was analyzed around the cases of England and U.S.A, and based on that information, the present condition and limits of CPTED related laws and regulations of Korea were deducted. As a result of this study, there were no constraint provisions to apply the design guidelines to actual planning, and there were limits on backup aid and actual application due to the lacking of analyzing the relevant area. Also, an acceptable framework must be arranged by the revision of laws and ordinances to compel the system, and link it with the CPTED certification system which will revitalize the whole system.

• Journal of Mechanical Science and Technology
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• 제17권9호
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• pp.1349-1357
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• 2003

This paper deals with verification of the theoretical model for dynamic behavior of Pipeline Inspection Gauge (PIG) traveling through high pressure natural gas pipeline. The dynamic behavior of the PIG depends on the differential pressure across its body. This differential pressure is generated by injected gas flow behind the tail of the PIG and expelled gas flow in front of its nose. To analyze the dynamic behavior characteristics such as gas flow in pipeline, and the PIG position and velocity, not only the mathematical models are derived, but also the theoretical models must be certified by actual pigging experiment. But there is not any found results of research on the experimental certification for dynamic behavior of the PIG. The reason is why the fabrication of the PIG as well as, a field application are very difficult. In this research, the effectiveness of the introduced solution using the method of characteristics (MOC) was certified through field application. In-line inspection tool, 30" geometry PIG, was fabricated and actual pigging was carried out at the pipeline segment in Korea Gas Corporation (KOGAS) high pressure system, Incheon LT (LNG Terminal) -Namdong GS (Governor Station) line. Pigging is fulfilled successfully. Comparison of simulation results with experimental results show that the derived mathematical models and the proposed computational schemes are effective for predicting the position and velocity of the PIG with a given operational conditions of pipeline.

• International Journal of Internet, Broadcasting and Communication
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• 제9권3호
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• pp.1-8
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• 2017

Recently, the development of the head mounted display (HMD) device has attracted a great deal of attention to the actual contents. Especially, Augmented Reality (AR), which is a mixture of actual information and virtual world information, is focused on. AR HMD is able to interact by arranging virtual objects in real space through spatial recognition using depth camera. In order to naturally mix virtual space with real space, it is necessary to develop a technology for realizing spatial mapping information with high accuracy. The purpose of this paper is to evaluate the optimal configuration of augmented reality application program by realizing accurate spatial mapping information when mapping a real space and an object placement environment using HoloLens. To do this, we changed the spatial mapping information in real space to three levels, which are the number of meshes used in cubic meters to scan step by step. After that, it was compared with the 3D model obtained by changing the actual space and mesh number. Experimental result shows that the higher the number of meshes used in cubic meters, the higher the accuracy between real space and spatial mapping. This paper is expected to be applied to augmented reality application programs that require scanning of highly mapped spatial mapping information.

• 한국근적외분광분석학회:학술대회논문집
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• 한국근적외분광분석학회 2001년도 NIR-2001
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• pp.1041-1041
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• 2001

Removal of variability in spectra data before the application of chemometric modeling will generally result in simpler (and presumably more robust) models. Particularly for sparsely sampled data, such as typically encountered in diode array instruments, the use of Savitzky-Golay (S-G) derivatives offers an effective method to remove effects of shifting baselines and sloping or curving apparent baselines often observed with scattering samples. The application of these convolution functions is equivalent to fitting a selected polynomial to a number of points in the spectrum, usually 5 to 25 points. The value of the polynomial evaluated at its mid-point, or its derivative, is taken as the (smoothed) spectrum or its derivative at the mid-point of the wavelength window. The process is continued for successive windows along the spectrum. The original paper, published in 1964 [1] presented these convolution functions as integers to be used as multipliers for the spectral values at equal intervals in the window, with a normalization integer to divide the sum of the products, to determine the result for each point. Steinier et al. [2] published corrections to errors in the original presentation [1], and a vector formulation for obtaining the coefficients. The actual selection of the degree of polynomial and number of points in the window determines whether closely situated bands and shoulders are resolved in the derivatives. Furthermore, the actual noise reduction in the derivatives may be estimated from the square root of the sums of the coefficients, divided by the NORM value. A simple technique to evaluate the actual convolution factors employed in the calculation by the software will be presented. It has been found that some software packages do not properly account for the sampling interval of the spectral data (Equation Ⅶ in [1]). While this is not a problem in the construction and implementation of chemometric models, it may be noticed in comparing models at differing spectral resolutions. Also, the effects on parameters of PLS models of choosing various polynomials and numbers of points in the window will be presented.

• Educational Technology International
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• 제11권1호
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• pp.27-46
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• 2010

The purpose of this paper is to apply the newly developed SICAT teaching and learning model to the actual scene of teaching and learning and draw a point of discussion for utilizing teaching and learning model, by uncovering the satisfaction of students and the inhibiting/facilitating elements when using the model. SICAT(Scientific Inquiry and Creative Activity with Technology; from here on SICAT), a teaching and learning model custom-built for engineering education, was developed, as more and more people paid attention to the demand for creative engineers. It was developed from the basis of PBL(Problem Based Learning), includes three sub-types which can be applied to the actual theory, design, and experimentation fields within engineering education. The three sub-types, which are ARDA(Analysis-Reasoning Activity & Discussion-Argumentation Activity), CoCD (Collaboration Activity & Capstone Design Activity), and ReSh(Reflection Activity & Sharing Activity), respectively support deductive and argumentation activities, creative design and collaboration activities, and retrospection and sharing activities. However, no research has been conducted to investigate whether or not there are inhibiting or facilitating elements in the application procedure, or what the rate of satisfaction for students is, when applying the SICAT model, which was newly developed to innovate existing engineering education, to the actual site of teaching and learning. Therefore, this research applied three types of SICAT teaching and learning models to the theory, design, and experimentation classes at the department of materials science and engineering at Hanyang University for eight weeks. After application, the students, teachers and tutors were surveyed and interviewed, and then the results analyzed in order to uncover inhibiting/facilitating elements and the rate of satisfaction. The satisfaction rate of students from the SICAT teaching and learning model was 3.78(in a perfect score of 5: The A type-3.65, The C type-3.80, The R type-3.90), and inhibiting/facilitating elements were drawn from the aspects of learning activities, support system. In conclusion, they can be contributed for implications of SICAT teaching and learning model universal use at engineering education in University.

• 한국분무공학회지
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• 제29권2호
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• pp.53-59
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• 2024

Cars are one of the main causes of air pollution in large cities, and 34.6% of domestic air pollution emissions come from mobile sources, of which cars account for 69.6%. In particular, the importance of nitrogen oxides (NOx) and particulate matter (PM), which are major pollutants in diesel vehicles, is increasing due to their high contribution to emissions. Therefore, in this study, the problem of natural regeneration caused by low exhaust gas temperature during low speed and low load operation was solved by applying a complex regeneration DPF that is not affected by temperature conditions to large diesel vehicles with higher driving time and engine displacement than small and medium-sized vehicles. And the feasibility of application to large diesel vehicles was reviewed by measuring the emission reduction efficiency. As a result of the reduction efficiency test on the actual vehicle durability product, PM showed a reduction efficiency of 84% to 86%, and the reduction efficiency of gaseous substances showed a high reduction efficiency of over 90%. The actual vehicle applicability test was completed with three driving patterns: village bus vehicle, police car, and road-going construction equipment vehicle, and no device problems occurred until the end of the test. Both load and no-load smoke measurement results showed a smoke reduction efficiency of over 96%.

• 경영정보학연구
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• 제18권2호
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• pp.107-125
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• 2016

모바일 앱 시장이 발달하면서 사용자들이 앱을 사용한 만큼 기부에 참여할 수 있는 새로운 모바일 기부 앱이 등장하였다. 새로운 형태의 모바일 기부 앱은 모바일 앱의 기능과 기부의 시너지 효과를 통해 기부 시장을 활성화할 수 있을 뿐만 아니라 차별화된 모바일 앱 서비스를 제공함으로써 모바일 앱 시장을 확장한다는 점에서 중요한 의의를 지닌다. 그럼에도 불구하고 어떠한 종류의 모바일 기부 앱 서비스가 사용자의 사용 의도를 증대시킬지에 대한 연구는 부족한 실정이다. 본 연구는 공익연계 마케팅 이론을 바탕으로 어떠한 형태의 모바일 기부 앱이 사용 의도에 더 큰 영향을 미치는지를 밝히고자 한다. 이를 위하여 첫째, 직접적 혹은 간접적 모바일 기부 앱이 지각된 효과성과 공익 관여도를 매개로 하여 모바일 기부 앱 사용 의도에 어떠한 영향을 미치는지에 대한 실험을 모바일 앱 사용자들을 대상으로 실시하였다. 분산분석 결과, 간접적 모바일 기부 앱이 직접적 모바일 기부 앱보다 지각된 효과성과 공익 관여도에 더 높은 영향을 미치며 PLS 경로 분석을 통하여 지각된 효과성과 공익 관여도가 높을수록 모바일 기부 앱 사용 의도를 높아진다는 사실을 확인하였다. 추가연구에서는 간접적 모바일 기부 앱의 실용적, 쾌락적 속성이 지각된 효과성과 공익 관여도에 어떠한 영향을 미치는지에 대한 실험을 진행하였다. 그 결과, 실용적 속성이 더 많은 영향을 준다는 사실을 일원분산분석을 통하여 입증하였다. 본 연구의 결과는 모바일 기부 앱 활성화를 위해 실증적인 디자인 가이드라인을 제공해줄 수 있을 것이다.

• 한국보육지원학회지
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• 제10권6호
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• pp.5-23
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• 2014

이 연구는 유아 교사들의 다중매체 활용능력과 이야기 들려주기를 위해 다중매체를 활용하는 것에 대한 인식 및 실제 활용도 간의 관계를 알아보고자 수행되었다. 서울, 경기, 인천의 유아반 교사 225명을 대상으로 조사한 결과는 다음과 같다. 첫째, 다양한 교사 변인과 기관 변인에 따라 교사의 다중매체 활용능력, 이야기 들려주기를 위한 다중매체 사용에 대한 인식, 그리고 실제 활용도에 차이가 있었다. 둘째, 교사의 다중매체 활용능력, 이야기 들려주기를 위한 다중매체 활용에 대한 인식과 활용도 간에 모두 높은 수준의 정적 상관이 나타났다. 셋째, 교사가 이야기 들려주기를 위해 다중매체를 활용하는 정도에 영향을 미치는 변수들은 다중매체 활용의 중요성 인식, 학력, 멀티미디어 활용능력, 학급 규모, 다중매체 관련 수강 경험 순으로 나타났다. 이 연구는 교수를 계획하고 실행하는 교사의 인식이 갖는 의미와 실무능력의 중요성, 이를 향상시키기 위한 교사 교육 및 기관 지원의 필요성을 보여주었다.

• 한국항만경제학회지
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• 제28권4호
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• pp.121-147
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• 2012

스마트폰의 급속한 보급은 개인의 생활뿐만 아니라 기업의 업무에도 많은 영향을 미치고 있다. 기업 구성원들은 스마트폰과 같은 모바일 기기를 이용해서 업무를 수행하고 있고, 기업 간 정보공유를 통한 협업을 하고 있다. 이에 따라 기업들은 스마트폰에서 사용할 수 있는 업무용 모바일 애플리케이션을 개발하여 사용하고 있으며, 특히 해운물류분야에서 화물을 추적하고 가시성을 제공하기 위하여 해운물류 모바일 애플리케이션을 개발하여 사용하고 있다. 본 연구에서는 국내 해운물류업계에서 개발, 사용되고 있는 해운물류 모바일 애플리케이션들을 실제로 사용하는 해운물류종사자들의 사용의도와 실제 사용에 영향을 미치는 요인에 대하여 알아보기 위하여 설문조사를 통한 실증분석을 하였다. 연구변수로는 모바일 애플리케이션의 사용의도에 영향을 미치는 요인으로 사회적 영향, 혁신성, 지각된 가치, 기업 간 협업 등을 사용하였다. 또한 사용의도와 실제 사용간의 관계를 규명하기 위하여 모바일 애플리케이션의 실제 사용 측정도구로는 접속 빈도와 접속 시간을 사용하였다. 총 168부의 설문이 가설검정에 사용되었다. 분석결과를 살펴보면 다음과 같다. 첫째, 사회적 영향, 혁신성, 지각된 가치 등의 3가지 변수들은 해운물류 모바일 애플리케이션의 사용의도에 정의 영향을 미치는 것으로 확인되었다. 반면 기업 간 협업은 사용의도에 영향을 미치지 않는 것으로 나타났다. 둘째, 해운물류 모바일 애플리케이션의 사용의도는 실제 사용에 영향을 미치는 것으로 확인되었다.