• Journal of applied mathematics & informatics
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• 제28권1_2호
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• pp.439-450
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• 2010

In this paper, we propose a new idea to evaluate the prediction accuracy of user's preference generated by memory-based collaborative filtering algorithm before prediction process in the recommender system. Our analysis results show the possibility of a pre-evaluation before the prediction process of users' preference of item's transaction on the web. Classification functions proposed in this study generate a user's rating pattern under certain conditions. In this research, we test whether classification functions select users who have lower prediction or higher prediction performance under collaborative filtering recommendation approach. The statistical test results will be based on the differences of the prediction accuracy of each user group which are classified by classification functions using the generative probability of specific rating. The characteristics of rating patterns of classified users will also be presented.

• 소성∙가공
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• 제23권8호
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• pp.507-512
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• 2014

The objective of the current investigation is to establish techniques in micro pattern forming operations of polymeric circular tubes by using hydrostatic pressing. This method was developed and successfully applied to the micro pattern forming on polymeric plates. The key idea of the new technique is to pressurize multiple vacuum-packed substrate-mold stacks above the glass transition temperature of the polymeric substrates. The new process is thought to be a promising micro-pattern fabrication technique for two reasons; first, (hydro-) isostatic pressing ensures a uniform micro-pattern replicating condition regardless of the substrate area and thickness. Second, multiple curved substrates can be patterned at the same time. With the prototype forming machine for the new process, micro prismatic array patterns, 25um in height and 90 degrees in apex angle, were successfully made on the PMMA circular tubes with diameters of 5~40mm. These results show that this process can be also used in the micro pattern forming process on curved plates such as circular tube.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 B
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• pp.960-962
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• 1999

The main idea of the proposed neuro-fuzzy system is conditional clustering whose main objective is to develop clusters preserving homogeneity of the clustered patterns with regard to their similarity in the input space as well as their respective values assumed in the output space. In the proposed neuro-fuzzy system, the structure identification is used with conditional fuzzy clustering, the parameter identification carried out by the hybrid learning scheme using back-propagation and total least squares.

• Structural Engineering and Mechanics
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• 제51권2호
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• pp.349-360
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• 2014

In this study, three approximate analytical methods have been proposed to prepare an accurate analytical solution for nonlinear oscillators with fractional potential. The basic idea of the approaches and their applications to nonlinear discontinuous equations have been completely presented and discussed. Some patterns are also presented to show the accuracy of the methods. Comparisons between Energy Balance Method (EBM), Variational Iteration Method (VIM) and Hamiltonian Approach (HA) shows that the proposed approaches are very close together and could be easily extend to conservative nonlinear vibrations.

• 농촌지도와개발
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• 제8권1호
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• pp.85-92
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• 2001

As the technology, global economy, and social structures and patterns have rapidly been changing since the 20th century, the forward-thinking leaders in the world begin to realize that they must embrace a new paradigm in management and organizational theories. The new idea of management is focused on equality rather than hierarchical structure, and more responsive to the external environment, more flexible, and better prepared to give customers what they want. From this new paradigm revolution, the nonprofit organizations like youth development organization are trying to approach and implement the new theories and models. This study attempted to introduce the historical trend and a new paradigm of youth development organizational structures and programs in the USA that may help Korea to improve youth organizations and programs. The youth development sector should create healthy, thriving organizations and structures that cultivate staff, programs, partnership between youth and adults, and community.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제4권6호
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• pp.1194-1208
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• 2010

As visual surveillance systems gain wider usage in a variety of fields, it is important that they are capable of interpreting scenes automatically, also known as "human motion analysis" (HMA). However, existing HMA methods are too domain specific and computationally expensive. This paper proposes a general purpose HMA method that is based on the idea that human beings tend to exhibit erratic motion patterns during abnormal situations. Limb movements are characterized using the statistics of angular and linear displacements. In addition, the method is enhanced via the use of the entropy of the Fourier spectrum to measure the randomness of subject's motions. Various experiments have been conducted and the results indicate that the proposed method has very high classification accuracy in identifying anomalous behavior.

• 산업경영시스템학회지
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• 제22권50호
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• pp.323-332
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• 1999

In physiognomy, people's personality are judged by their types and features of the face, in Oriental medicine, types of the face is an important factor to judge whether one is falling ill or not. With the help of this kind of idea, we can assume that customers' preferences for automobile are different depending on their types and features of the face, and that it is also the case with their purchasing purpose. In addition, we think we can apply this physiognomical concept to marketing. The purpose of this study is analyzing people's difference of considering factors when buying automobiles and purchasing purpose according to their different types and features of the face. As a result, considering factors and purchasing purpose are different in proportion to sex, age, types and features of the face. When several more studies related to this study are performed, we expect that this study will be applied to marketing.

• 반도체디스플레이기술학회지
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• 제19권2호
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• pp.82-87
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• 2020

In this paper, we introduce the novel idea to improve the B/W usage efficiency of on-chip networks used for TAM to test multiple DRAMs. In order to avoid the local bottleneck of test packets caused by an ATE, we make test patterns using microcode-based instructions within ATE and adopt a test bus to transmit test responses from DRAM DFT (Design for Testability) called Test Generator (TG) to ATE. The proposed test platform will contribute to increasing the test economics of memory IC industry.

• 환경생물
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• 제25권2호
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• pp.158-167
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• 2007

내설악 전나무림 현황을 조사하고 이를 통하여 산림 생태계 이해방식을 비판적으로 고찰하였다. 조사는 1996년부터 2006년까지 수행된 것으로 일종의 중간보고서로 작성하였다. 임분의 수직구조 위주로 조사하였으며 비록 내설악 전나무림에 한정된 것이기는 하나 고전 천이론 보다는 Stand dynamic이 산림생태계를 설명하는데 적합하다는 것을 확인할 수 있었다.

• 한국멀티미디어학회논문지
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• 제25권2호
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• pp.421-431
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• 2022

The purpose of this research is to determine the point of fixation of the driver during the process of driving. Based on the results of this research, the driving instructor can make a judgement on what the trainee stare on the most. Traffic accidents have become a serious concern in modern society. Especially, the traffic accidents among unskilled and elderly drivers are at issue. A driver should put attention on the vehicles around, traffic signs, passersby, passengers, road situation and its dashboard. An eye-tracking-based application was developed to analyze the driver's gaze behavior. It is a prototype for real-time eye tracking for monitoring the point of interest of drivers in driving practice. In this study, the driver's attention was measured by capturing the movement of the eyes in real road driving conditions using these tools. As a result, dwelling duration time, entry time and the average of fixation of the eye gaze are leading parameters that could help us prove the idea of this study.