• Honam Mathematical Journal
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• v.44 no.3
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• pp.402-418
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• 2022

Noise is a fundamental factor to increased validity and regularity of spike propagation and neuronal firing in the nervous system. In this paper, we examine the stochastic version of the Izhikevich-FitzHugh neuron dynamical model. This approach is based on techniques presented by Luo and Guo, which provide a general framework for the bifurcation and stability analysis of two dimensional stochastic dynamical system as an Itô averaging diffusion system. By using largest lyapunov exponent, local and global stability of the stochastic system at the equilibrium point are investigated. We focus on the two kinds of stochastic bifurcations: the P-bifurcation and the D-bifurcations. By use of polar coordinate, Taylor expansion and stochastic averaging method, it is shown that there exists choices of diffusion and drift parameters such that these bifurcations occurs. Finally, numerical simulations in various viewpoints, including phase portrait, evolution in time and probability density, are presented to show the effects of the diffusion and drift coefficients that illustrate our theoretical results.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.315-317
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• 2010

본 논문에서는 u-City 감리를 위한 정보시스템감리와 정보통신공사감리의 통합된 감리점검프레임워크를 제시하였다. 이를 위하여 먼저 u-City 감리점검프레임워크의 요구사항을 정리하였으며, 기존의 정보시스템 감리점검 프레임워크와 정보통신감리 프레임워크를 간략히 소개한 후, u-City 감리를 위한 정보시스템감리와 정보통신공사감리의 통합된 감리점검 프레임워크를 제시하였다.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2023.11a
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• pp.202-203
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• 2023

최근 화재 탐지 분야는 불꽃 연기의 특징과 인공지능 인식(Detection) 모델을 활용하여 탐지율을 높이려는 연구가 많이 진행되어 왔다. 기존 화재 탐지 정확도를 높이기 위한 모델 연구 이외에도 불꽃·연기의 특징을 다양한 방법으로 데이터 가공한 학습 데이터셋을 활용하는 연구들이 진행되고 있다. 본 논문에서는 화재 탐지시 불꽃/연기의 오탐지율이 높은 것을 확인하고 오탐지율을 낮추기 위해 화재 상황을 인식하여 분류하는 방법과 데이터셋을 제안한다. 제안한 모델은 동영상을 학습데이터로 활용하여 화재 상황의 특징을 추출하여 분류모델에 적용하였다. 평가는 한국정보화진흥원(NIA)에서 진행하는 화재 데이터셋을 이용하여 Yolov8, Slowfast의 모델 성능을 비교 및 분석하였다.

• Development and Reproduction
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• v.5 no.1
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• pp.59-71
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• 2001

Since the first radioimmunoassay (RIA) was developed in 1970s, many conventional RIAs and non-isotopic immunoassays (NIA) had been developed in which the degree of precision, accuracy, specificity and practicability have progressively increased. Recently ultrasensitive assay method at femtogram to determine testosterone in serum, saliva and feces is required for the study of sexual dysfunctions in male and female, monitoring the psychological stress and conditions, aging process such as menopause and partial androgen deficiency in aging male, the hormonal changes of small experimental animals etc. This review discussed the recentd evelopments of steroid assay methods, based upon the testosterone assay results of authors far 20 years, and the problems associated the assay set-up, the characterizations and applications of the established procedures, and desifls of assay, reliablity criteria, and the practical aspects of assay set-up and application, based upon the data of the authors. The present study demonstrates the general problems methods to be consider in order to set up the highly sensitive assay methods and to increase the assay quality and the necessity of assay quality control program. To improve the assay quality of each laboratory and to compare the assay results in homeland, the national QC programs should be organized.

• Journal of the Korean Society for information Management
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• v.39 no.3
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• pp.165-193
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• 2022

It can be said that digital technology is at the center of the change in the modern work environment. In particular, in general public institutions that prove their work with records produced by business management systems and document production systems, the record management system is also the work environment itself. Gimpo City applied for the 2021 public cloud leading project of the National Information Society Agency (NIA) to proactively respond to the 4th industrial revolution technology era and implemented a public cloud-based AI-OCR technology enhancement project with 330 million won in support of 330 million won. Through this, it was converted into data beyond the limitations of non-electronic records limited to search and image viewing that depend on standardized index values. In addition, a 98% recognition rate was realized by applying a new technology called AI-OCR. Since digital technology has been used to improve work efficiency, productivity, development cost, and record management service levels of internal and external users, we would like to share the direction of enhancing expertise in the record management and implementation of work environment innovation.

• Journal of Korea Multimedia Society
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• v.18 no.5
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• pp.599-609
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• 2015

As smartphone usage has increased recently, so has smartphone addiction. Many of the smartphone users, however, do not even recognize the risk of smartphone addiction. In this experiment, smartphone users have been categorized into two groups by smartphone addiction measure (S-measure) developed by 2011 National Information Society Agency (NIA): A high risk group and a normal group. The changes of brain waves have been observed when the subjects were watching emotional videos of anger, sadness, happiness, and fear. The results show that the values of FP1 and FP2 (frontal lobe) theta band of the high risk group have been measured to be high, which indicate anxiety disorder. Although happiness and fear videos showed no difference between these groups, sadness and anger videos showed significantly different results for these groups: the brain waves of the high risk group showed higher values than those of the normal group. Therefore, this experiment showed that the high risk group takes feelings of sadness and anger more sensitively than the normal group.

• Journal of Contemporary Eastern Asia
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• v.16 no.1
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• pp.22-45
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• 2017

The successful management of software (SW) projects is a continuous concern to managers, which is attributed to the contradictory demands that most projects are facing; meeting user requirements within time and budget limit while flexibly dealing risks during the progress of the projects. The present study asserts project performance and risk mitigation are not tradeoff but to be achieved simultaneously, which is called SW project ambidexterity. Drawing on the literature on organizational behavior, hypotheses are developed speculating the relation among project performance, risk mitigation, team collective improvisation, team behavioral integration, and team diversity. Using empirical data collected from 102 SW project teams of 507 team members in South Korea, empirical analysis indicates team collective improvisation is a significant antecedent to SW project ambidexterity, playing a pivotal role to balance the contradictory demands. Furthermore, team behavioral integration positively influences the degree of team collective improvisation, and the magnitude of the relation is partially contingent on the team members' age and major diversity. The present study advances theory by providing a context specific explanation about the SW project ambidexterity and its precedents.

• Proceedings of the Korean Society of Plant Pathology Conference
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• 2003.10a
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• pp.76.2-77
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• 2003

The complete nucleotide sequences of genomic RNA of an isolate of soybean mosaic virus (SMV-CN18), which has ability to overcome Rsv resistance of soybean, have been determined. A large open reading frame encodes a polyprotein of 3068 amino acids with a predicted Mr of 350 kDa. Based on comparison with the proposed cleavage site of other potyviral polyproteins, nine mature proteins are predicted as a following order, P1, HC-Pro, P3, CI, 6K, VPg, NIa, NIb and coat protein (CP). The mature proteins of the strain share various amino acid identity with known SMV-G2, -G7 and -N strain, with the greatest variability occurring in the P1 (91 ％, 88 ％, 96％)and the lowest variability in the CP (100 ％, 99 ％, 100 ％). In addition, 5' untranslated region determined by 5' RACE is much more various than any coding regions. Difference in amino acid sequences throughout the genome is discussed in relation to resistance and susceptibility of soybean cultivars to SMV-CNl8.

• 한국경영정보학회:학술대회논문집
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• 2008.06a
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• pp.400-410
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• 2008

As the number of blog users has been increasing significantly, a lot of studies have been carried out to find out what makes people use a blog or feel satisfied with it. However, most of the previous studies assumed that dissatisfaction is the opposite of satisfaction and a person who is dissatisfied with a blog does not use it, failing to explain about blog users who do not feel satisfied with their blogs but use them continually. In addition, the studies found out just blog users' motives and satisfying factors in using blogs, and did not suggest any way to improve and promote blog services. Against this backdrop, this study conducted a survey of blog users in order to examine how the satisfying factors of a blog selected through a prior study affect both satisfaction and dissatisfaction of a user. The survey results showed that the satisfying factors are divided into two groups: group A which affect satisfaction and dissatisfaction equally, and group B which affect them differently. Based on the results, this study subdivides group A into high involvement factors and low involvement ones, and group B into motivators, which strongly affect satisfaction, and hygiene factors, which strongly affect dissatisfaction. According to characteristics of each group, this study suggests ways to improve and promote blog services.

• Proceedings of the Korean Nutrition Society Conference
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• 2002.05a
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• pp.60-67
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• 2002

락토페린은 주로 유즙에 많이 포함되어 있으며 인간 분비물 등에서도 발견되는 당단백질로써, 미생물 감염에 대한 방어작용이 있는 것으로 알려져 있다. 락토페린의 미생물에 대한 방어작용은 미생물 성장에 필요한 철이온이 락토페린에 결합하여 성장을 저해하기 때문인 것으로 알려져 있다. 락토페린은 이외에도 염증반응의 조절, 임파세포의 성장촉진 등 면역반응에도 관여하는데 이러한 활성은 철에 결합하는 성질과는 무관하게 일어나며 락토페린이 DNA에 결합하는 성질과 관련이 있는 것으로 추측되어진다. 락토페린은 DNA에 결합하여 유전자의 전사에 관여할 것으로 여겨지는데 그 동안 어떤 유전자의 발현에 관여하는지에 대해서 알려진 바가 없었다. 최근 본 연구팀은 락토페린이 포유세포의 세포유전자의 전사에 관여하는지를 분석한 결과 락토페린 결합부위를 가지고 있는 유전자중의 하나인 인간 인터루킨-1$\beta$ 유전자의 전사를 활성화시킨다는 연구 결과를 보여 주었다. 인간 myelogenous leukaemia 세포주인 K562 세포를 락토페린과 phorbolmyristate acetate(PMA)로 함께 처리하면 K562 세포의 인터루킨-1$\beta$ mRNA의 양은 PMA 단독으로 처리하였을 때 보다 상승적으로 더 많이 유도됨을 보여주었다. 또한 IL-1$\beta$/Luciferase 융합 유전자를 K562 배양세포에 넣어 전사 활성을 비교함으로써 락토페린에 의한 인터루킨-l$\beta$의 전사활성을 확인하였다. 락토페린을 전체, N-말단, 혹은 C- 말단 부위를 COS-1 세포에 발현시켜 전사 활성을 측정한 결과 C-말단 쪽은 전사활성이 없었으나 N-말단 90개 아미노산 부위(NIa라 명명)가 전사활성을 가지고 있음을 규명하였다. 본 연구결과는 락토페린이 인터루킨-l$\beta$의 유전자의 전사에 역할을 하고 있음을 보여 주고 있으며 또한 인터루킨-1$\beta$의 유전자 외에도 락토페린 결합 부위를 유전자의 조절부위에 포함하고 있는 세포 유전자의 전사도 관여할 수 있음을 제시하고 있다.