• Korea-Australia Rheology Journal
• /
• v.19 no.4
• /
• pp.227-232
• /
• 2007

The use of various shearing apparatuses to study the phase behavior of poly(styrene-b-isoprene) diblock copolymer micelles is described. A DMTA rheometer was modified so that one can apply oscillatory shear and obtain the scattering pattern along the shear gradient direction. A cone and plate shear cell was designed to access scattering along the shear vorticity direction, and both oscillatory and steady shear can be applied. The most popular way to employ steady shear on relatively low viscosity fluids is to use a Couette cell, because a high shear rate can be readily achieved without disturbing the sample by overflow. In this work, oscillatory shear was used to obtain a single crystal-like scattering pattern, and thereby to examine the mechanism of the thermotropic transition between face-centered cubic (fcc) and body-centered cubic (bcc) lattices. By applying the steady shear, the response of the fcc lattices to various shear rates is discussed.

• Journal of Information Processing Systems
• /
• v.14 no.2
• /
• pp.523-538
• /
• 2018

Keystroke dynamics user authentication is a behavior-based authentication method which analyzes patterns in how a user enters passwords and PINs to authenticate the user. Even if a password or PIN is revealed to another user, it analyzes the input pattern to authenticate the user; hence, it can compensate for the drawbacks of knowledge-based (what you know) authentication. However, users' input patterns are not always fixed, and each user's touch method is different. Therefore, there are limitations to extracting the same features for all users to create a user's pattern and perform authentication. In this study, we perform experiments to examine the changes in user authentication performance when using feature vectors customized for each user versus using all features. User customized features show a mean improvement of over 6% in error equal rate, as compared to when all features are used.

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.56 no.5
• /
• pp.848-853
• /
• 2007

This paper presents a methodology of estimating incomplete information in electricity markets for analyzing the gaming behavior of Generating Companies (GENCOs). Each GENCO needs to model its opponents' unknown information of strategic biddings and cost functions. In electricity markets with complete information, each GENCO knows its rivals' payoff functions and tries to maximize its own profit at Nash equilibriurnl Nli) by acknowledging the rivals' cost function. On the other hand, in the incomplete information markets, each GENCO lacks information about its rivals. Load patterns can change continuously due to many factors such as weather, price, contingency, etc. In this paper, we propose the method of the estimation of the opponents' cost function using market price, transaction quantities. and customer load patterns. A numerical example with two GENCOs is illustrated to show the basic idea and effectiveness of the proposed methodology.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2005.10a
• /
• pp.422-440
• /
• 2005

There are many kinds of research on web graph, most of them are focus on the hyperlinked structure of the web graph. Well known results on the web graph are rich-get-richer phenomenon, small-world phenomenon, scale-free network, etc. In this paper, we define a new directed web graph, so called the Web Usage Pattern Graph (WUPG), that nodes represent web sites and arcs between nodes represent a movement between two sites by users' browsing behavior. The data to constructing the WUPG, approximately 56,000 records, are gathered in the Kyungsung University. The results analysing the data summarized as follows: (i) extremely rich-get-richer phenomenon (ii) average path length between sites is significantly less than the previous one (iii) less external hyperlinks, more internal hyperlinks

• Korean Security Journal
• /
• no.8
• /
• pp.309-336
• /
• 2004

Approximately equivalent to character disorder or character neuroses or behavioral reaction. For a discussion of the term as used currently, in the 1968 revision of psychiatric nomenclature(DSM-II). In DSM-I(1952 nomenclature), this term referred to those cases in which the personality, in its struggle for adjustment to internal and external stresses, utilized primarily a pattern of action or behavior rather than symptoms in the mental, somatic or emotional spheres. There is minimal subjective anxiety and little or no sense of distress. As thus defined, there are three main groups of personality disorder, personality pattern disturbance, personality trait disturbance and sociopathic, personality disturbance. Morton Prince asks whether a subconscious process can perform the same function as are ordinarily performed by conscious intelligence that is to say memory, perception, reasoning, imagination, volition, affectivity, etc? He cites clinical material at great length, concluding that the quality of the functions performed they frequently exhibit, that which is characteristic of intelligence.

• The korean journal of orthodontics
• /
• v.16 no.1
• /
• pp.145-154
• /
• 1986

The purpose of the present study was to investigate the coordination and correlation of growth pattern between craniomaxillary complex and mandible, and among the craniofacial region, body-weight and stature. 14 boys and 16 girls between 6 and 12 years of age were used in this study. The result were as follows; 1. Total increments and maximum increment in mandible is higher than in oraniomaxillary complex during given period and no significant sexual difference existed. 2. The annual growth of craniofacial region did not assume an aspect of constant growth, periodically. 3. Craniofacial growth pattern was interrelated with stature more than with body-weight. 4. The growth behavior of body-weight and stature coincided with the growth of craniofacial region or preceded it in time.

• Genomics & Informatics
• /
• v.1 no.1
• /
• pp.32-39
• /
• 2003

We present a latent variable model-based approach to the analysis of gene expression patterns, coupled with topographic clustering. Aspect model, a latent variable model for dyadic data, is applied to extract latent patterns underlying complex variations of gene expression levels. Then a topographic clustering is performed to find coherent groups of genes, based on the extracted latent patterns as well as individual gene expression behaviors. Applied to cell cycle­regulated genes of the yeast Saccharomyces cerevisiae, the proposed method could discover biologically meaningful patterns related with characteristic expression behavior in particular cell cycle phases. In addition, the display of the variation in the composition of these latent patterns on the cluster map provided more facilitated interpretation of the resulting cluster structure. From this, we argue that latent variable models, coupled with topographic clustering, are a promising tool for explorative analysis of gene expression data.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2017.01a
• /
• pp.213-216
• /
• 2017

본 논문에서는 사용자 입력패턴 분석을 통한 행위 기반 인증 방법을 제안한다. 이 알고리즘은 기기를 통해 들어온 사용자의 다양한 입력정보를 받아오고, 받아온 정보를 분석하여 사용자만의 고유한 정보를 추출한다. 이렇게 추출된 정보를 데이터베이스에 저장 후, 사용자에 대한 인증요청이 들어오면 입력 정보들과 저장된 입력정보의 일치여부에 따라 인증을 허용할지 결정한다. 이를 이용하면 사용자의 고유한 행위에 대한 정보를 가지고 인증을 진행하기 때문에, 사용자의 기억에 의존하지 않고 간단하게 인증 절차를 진행할 수 있다. 본 논문에서는 실험을 통해 모인 데이터를 분석하여 제안하는 인증 방법이 실질적으로 사용자 인증에 적용 될 수 있음을 보인다.

• Proceedings of the KSR Conference
• /
• 2000.11a
• /
• pp.190-197
• /
• 2000

This study was executed to investigate the components making passenger satisfied or unsatisfied for the domestic train seats, and the patterns of the behavior that passenger taking in the train. These results would help in developing the high-speed train seat that adapts the Korean body structure and emotion. This investigation was done for 436 persons who taking in Saemaeul, Mukungwha, Tongil train during the January 1998. In addition subjective evaluations for texture properties, color, and pattern of the seat covers were investigated for 32 subjects in the lab under the controled condition in order to find to which one Korean prefer. The result shows that it is important to enhance the ride quality, and for coverage passenger prefers the soft texture, blue tone color, and abstract pattern.

• Proceedings of the Korean Institute of Interior Design Conference
• /
• 1999.04a
• /
• pp.126-132
• /
• 1999

The purpose of this study is to advance apartment houses in quality as a residence through revitalization of tradition and the procedures are as follows: The first procedure is theoretical contemplation. The second procedure is analysis of the traditional residential space that gives a starting point of introspection of it without cease at the stage of formal following or pattern application in revitalizing tradition in the apartment houses. And the third procedure is to select and suggest aspects applicable to developing Korean style apartment houses. The suggest is embodied by a plane figure of 55 pyong type apartment house after selecting the concrete development aspects with approaches such as arrangement and interior space analysis, behavior analysis and space division and design analysis. This study has its meaning in that it suggests a possibility of various approaches other than formal following or pattern application in revitalizing tradition in a new Korean type apartment house, that it gives another selection to diversifying consumers' patterns and that it helps recognize and develop our tradition in this age of cultural nationalism.