• Journal of Communications and Networks
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• 제6권1호
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• pp.38-45
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• 2004

The ABR point-to-multipoint connection is now playing a more important role than before. Many consolidation algorithms have been proposed to solve the consolidation noise problem and the slow transient response problem. But few timeout algorithms are proposed to handle the non-responsive branches for the multicast connections. Chen’s algorithm needs exchanging control messages between switches [9]. Besides, it may mistake a responsive branch as a non-responsive branch because of fast changes in source rates, which causes wrong information in BRM cells and may lead to network congestion and data losses in the responsive branch. We propose a simple timeout algorithm which can handle the non-responsive branches without exchanging message between switches. The timeout value for each switch is computed locally. Simulation results show that the proposed timeout algorithm can efficiently handle the non-responsive branches and utilize the available bandwidth within a small period of time. In addition, our algorithm could handle the situation when the source rates change quickly.

• Structural Engineering and Mechanics
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• 제88권6호
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• pp.583-588
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• 2023

Total hip replacement is a crucial intervention for patients with fractured hips who face challenges in natural recovery. The design of durable prostheses requires a comprehensive understanding of the natural processes occurring in bone. This article focuses on static loading analysis, specifically during stumbling activity, aiming to enhance the longevity of prosthetic implants. Three distinct implants, Charnley, Osteal, and Thompson, were selected for a detailed study to determine the most appropriate model. The results revealed critical insights into the distribution of Von Mises stresses on the components of femoral arthroplasty, including the cement, implant, and cortical bone. Furthermore, the examination of shear stress within the cement emerged as a pivotal aspect for all three implants, playing a crucial role in evaluating the performance and durability of hip prostheses. The conclusions drawn from this study strongly suggest that the Thompson model stands out as the most suitable choice for hip joint implants.

• BMB Reports
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• 제47권4호
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• pp.197-202
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• 2014

SOX3 is one of the earliest neural markers in vertebrates, playing the role in specifying neuronal fate. In this study we have established first functional link between CREB and human SOX3 gene which both have important roles in the nervous system throughout development and in the adulthood. Here we demonstrate both in vitro and in vivo that CREB binds to CRE half-site located -195 to -191 within the human SOX3 promoter. Overexpression studies with CREB or its dominant-negative inhibitor A-CREB indicate that this transcription factor acts as a positive regulator of basal SOX3 gene expression in NT2/D1 cells. This is further confirmed by mutational analysis where mutation of CREB binding site results in reduction of SOX3 promoter activity. Our results point at CREB as a positive regulator of SOX3 gene transcription in NT2/D1 cells, while its contribution to RA induction of SOX3 promoter is not prominent.

• The Korean Journal of Pain
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• 제36권2호
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• pp.163-172
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• 2023

Background: Synaptic plasticity contributes to nociceptive signal transmission and modulation, with calcium/calmodulin-dependent protein kinase II (CaMK II) playing a fundamental role in neural plasticity. This research was conducted to investigate the role of CaMK II in the transmission and regulation of nociceptive information within the nucleus accumbens (NAc) of naïve and morphine-tolerant rats. Methods: Randall Selitto and hot-plate tests were utilized to measure the hindpaw withdrawal latencies (HWLs) in response to noxious mechanical and thermal stimuli. To induce chronic morphine tolerance, rats received intraperitoneal morphine injection twice per day for seven days. CaMK II expression and activity were assessed using western blotting. Results: Intra-NAc microinjection of autocamtide-2-related inhibitory peptide (AIP) induced an increase in HWLs in naïve rats in response to noxious thermal and mechanical stimuli. Moreover, the expression of the phosphorylated CaMK II (p-CaMK II) was significantly decreased as determined by western blotting. Chronic intraperitoneal injection of morphine resulted in significant morphine tolerance in rats on Day 7, and an increase of p-CaMK II expression in NAc in morphine-tolerant rats was observed. Furthermore, intra-NAc administration of AIP elicited significant antinociceptive responses in morphine-tolerant rats. In addition, compared with naïve rats, AIP induced stronger thermal antinociceptive effects of the same dose in rats exhibiting morphine tolerance. Conclusions: This study shows that CaMK II in the NAc is involved in the transmission and regulation of nociception in naïve and morphine-tolerant rats.

• 대한지역사회영양학회지
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• 제5권1호
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• pp.63-73
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• 2000

The purpose of this study was to investigate the status of nutrition education at elementary schools. A total of 226 elementary school teachers within Changwon and Milyang city participated in this study . The results of this study are as follows. The average score on a test of nutrition knowledge was 4.40 out of 10, and teachers of Milyang districts type scored significantly higher on nutrition knowledge than teacher of Changwon rural and Milyang rural districts. Only 9.0% of the teachers had nutrition education training. 64.1% of th total had teaching experience in nutrition, 91.0% of that was being taught as a part of physical education and home economics. The information source for nutrition education was mainly guide books and magazine and newspaper articles. Current nutrition education was being taught mainly by lecture(85.0%) but the preferred methods of teaching in nutrition education were small group discussion(44.3%), role-playing(22.9%) and lecture(21.4%). Audio visuals aids were used by 45.5% of the teachers and the most common of them were VTR(43.1%) chart(22.4%) as preferred audio visuals aids of them were VTR(71.9%) adn actual model(14.1%)

• 대한구강악안면병리학회지
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• 제41권1호
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• pp.9-16
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• 2017

Porphyromonas gingivalis is a gram-negative bacteria of rod shape, and grown in an anerobic condition. It colonizes in subgingival crevice and is known as a major pathogen causing chronic periodontitis. It possesses an invasive property and replicative potential within various cell types, presumably playing an important role in modulating biological behaviors of oral cancer. However, the pathophysiology of P. gingivalis in the malignant transformation of oral cancer has not been fully understood. In this study, we aimed to investigate molecular changes of oral squamous cell carcinoma cells induced by repetitive P. gingivalis infection that clinically resembles chronic periodontitis.

• 대기
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• 제33권2호
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• pp.197-222
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• 2023

Remote sensing becomes a new and core framework for the atmospheric sciences and closely related areas concerning with the ever-changing global environmental status. However, remote sensing in the Korea Meteorological Society is relatively new, where the first relevant paper is appeared in 1983, as well as is an area with relatively limited number of research groups. Here, we review and summarize some of the key progress in this area within Korea Meteorological Society focusing on the areas of satellite, radar, and ground based remote sensing such as lidar, spectrometer and sun photometer. Overall, the area is shown to have the most significant progress occur along with the acquisition of the key infra structures such as the COMS (Communication, Ocean and Meteorological Satellite) and S-band radar system led by Korea Meteorological Administration in early 2000. After that, the area has quickly developed into a status playing important roles to lead and support the overall activities in the atmospheric measurements. It is expected that the importance and role of the remote sensing will increase in the coming years.

• 복식문화연구
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• 제28권6호
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• pp.815-829
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• 2020

The aim of this study is to investigate fashion activism that supports sustainability by pursuing social transformation through social media. This is achieved by publicizing the environmental and labor problems of the fashion industry. For this study, a literary survey and netnography were conducted from January 2017 to November 2020. We classified and analyzed environmental and labor issues that could be considered fashion activism on social media. The results are as follows. First, movements for conscious consumption appeared as #haulternative, #fashionourfuture, #SecondHandSeptember, and #wornwear projects. These movements are concerned with buying used goods, re-dressing clothes owned by individuals, and transforming and wearing them with new methods. Second, activism for environmental protection includes #fashionOnclimate by Global Fashion Agenda and Sustainable Fashion Matterz' #Watermatterz. These movements are directly involved in learning about the seriousness of environmental destruction caused by the fashion industry and participating in environmental protection with critical awareness. Third, the #whomademyclothes and the Clean Clothes Campaign are activism for improving the working environment, and are playing a role in publicizing labor issues by informing the general public about inadequate working conditions linked to the fashion industry. Thus, fashion activism on social media examined in this study can contribute to visualizing chronic problems that hinder sustainable development within the fashion industry.

• 정보처리학회논문지B
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• 제9B권5호
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• pp.625-634
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• 2002

본 논문에서는 베이지안 망을 기초로 불임환자의 임상 데이터에 대한 다양한 분석 실험을 전개하였다. 이 실험을 통해 임신여부에 영향을 주는 요인들간의 상호의존성을 분석해보고, 또 NBN, BAN, GBN 등 제약조건이 다른 다양한 유형의 베이지안 망 분류기들의 분류성능을 서로 비교해보았다. 그리고 우리는 이와 같은 실험을 통해 임신가능여부(Clin)에 직접적인 영향을 미치는 중요한 요인들로 증상(IND), 약물치료법(stimulation), 여성의 나이(FA), 미세조작 난자의 수(ICT), Wallace 사용여부(ETM) 등 5개의 특성들을 가려낼 수 있었고, 이 요인들간의 상호 의존성도 찾아낼 수 있었다. 또 서로 다른 유형의 베이지안 망 분류기들 중에서 요인들간의 상호의존관계를 허용하는 좀 더 일반적인 BAN과 GBN 등이 그렇지 못한 NBN에 비해 상대적으로 더 높은 분류 성능을 보여준다는 것을 확인하였다. 또 결정트리와 k-최근접 이웃과 같은 다른 분류기들과의 성능 비교를 통해, 임상 데이터의 특성상 확률적 표현과 추론에 기초한 베이지안 망 분류기들이 보다 높은 성능을 보여준다는 사실도 확인할 수 있었다. 또 본 논문에서는 클래스 노드의 Markov blanket에 속한 특성들로 특성집합을 축소하는 것을 제안하고, 실험을 통해 이 특성 축소방법이 베이지안 망 분류기들의 성능을 높여 줄 수 있는지 알아보았다.

• 컴퓨터교육학회논문지
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• 제8권4호
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• pp.79-86
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• 2005

본 연구에서는 충북 지역 남자 중학생을 대상으로 컴퓨터게임과 학업성취도와의 관계여부를 조사하였다. 조사 대상 학생 중 48%정도가 '컴퓨터게임을 거의 매일 한다'고 응답했고 '컴퓨터게임을 거의 하지 않는다'고 응답한 학생은 전체의 8% 정도였다. 공부를 잘하든 못하든 대부분의 학생들이 컴퓨터게임을 즐기고 있었으며 그 중 상위권 학생들은 한번 게임을 시작하면 1~2시간 이내에서 게임을 마치는 성향을 보였고, 롤플레잉 게임이나 시뮬레이션 게임을 즐기고 액션 게임은 거의 하지 않는 것으로 나타났다. 그리고 성적이 하위권인 학생 중에는 컴퓨터게임을 거의 하지 않는 학생이 상대적으로 많았고, 한 번 게임을 시작하면 3시간 이상 계속하는 게임 중독의 성향을 보이는 학생도 많았다. 또한 성적이 중위권인 학생들은 특이한 차이를 나타내지 않았다. 설문 조사 결과 컴퓨터게임을 자주하는 것과 학업성취도 간에는 관계가 없음을 알 수 있었다. 컴퓨터게임을 자주한다고 해서 성적이 나쁠 것이라는 우려는 하지 않아도 될 것 같다. 다만 공부를 잘하는 학생 중에 컴퓨터게임을 시작해서 3시간 이상 지속하는 학생의 비율은 상당히 적은 것으로 나타났다.