• Journal of Korea Entertainment Industry Association
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• v.13 no.6
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• pp.277-286
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• 2019

The aim of this study was to investigate the effects of computer-based cognitive rehabilitation and traditional cognitive training on the working memory and executive function of patients with mild traumatic brain injury. The sample consisted of 20 patients with mild traumatic brain injury who had received rehabilitation treatment in a rehabilitation unit. The subjects were assigned to either the experimental (n = 10) or control group (n = 10). The experimental group received computer-based cognitive rehabilitation and traditional cognitive training for 60 minutes, whereas the control group received only traditional cognitive training for 60 minutes. Both the groups received their respective interventions for 60 minutes a day and 5 times per week across a period of 4 weeks. Working memory and executive function were assessed using the digit span test (forward and backward), visual memory 1 and 2 of the Motor-free Visual Perception Test-3, trail making test, and Stroop test (A and B) both before and after the intervention. The experimental group showed a significantly greater improvement in visual memory and performance on the Stroop test A than the control group. These findings suggest that computer-based cognitive rehabilitation and traditional cognitive training are more effective in promoting positive changes in the working memory and executive function of individuals with mild traumatic brain injury than traditional cognitive training.

• Proceedings of the IEEK Conference
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• 2001.09a
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• pp.205-208
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• 2001

비디오 워터마킹 기술은 비인지성, 안전성 및 강인성의 일반적인 요구조건 이외에 실시간 처리의 요구 조건들이 부가된다. 또한 공격에 있어서 프레임 정보를 이용한 워터마크 제거와 같은 공격이 가능하기 때문에 정지 영상과 비교하여 설계 시 많은 고려가 요구된다. 본 논문에서는 이진의 삽입 정보가 삽입된 비디오 데이터로부터 양극성 랜덤 계열을 이용하여 워터마크를 추출하는 경우에 비디오 프레임 간의 움직임 예측에 의해 구성된 프레임을 이용하여 추출 성능을 향상시키기 위한 추출 방법을 제안하였다. 제안 방식의 실험 결과로부터 움직임 예측을 이용하지 않은 결과와 비교하여 워터마크 추출 성능이 향상되었음을 확인하였다.

• Information and Communications Magazine
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• v.33 no.8
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• pp.44-50
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• 2016

로봇의 활동 영역이 사람의 활동 영역과 점점 더 크게 겹쳐지면서 로봇이 사람과 무리없이 공존하는데 필요한 기술에 대한 요구가 심화되고 있다. 행위가독성은 겉으로 드러난 로봇의 행위를 기반으로 얼마나 쉽고 빠르게 로봇의 행위 의도를 판단할 수 있는지를 나타내는 지표로서 로봇과 상호작용하는 사람의 심리적이고 물리적인 부담을 최소화하는데 결정적인 요소로 받아들여지고 있다. 많은 연구를 통해 로봇 행위의 가독성이 높으면 사람이 더 빠르고 명료하게 로봇의 의도를 인지할 수 있고 그 결과 사람의 안전과 심리적 안정이 향상될 뿐 아니라 사람과 로봇 간 협업의 효율도 높아진다는 사실이 밝혀졌다. 이 글에서는 행위가독성의 개념을 소개하고 행위가독성을 향상하는 대표적 연구 사례들을 살펴본다.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.26 no.3
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• pp.37-40
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• 2015

본고에서는 "주파수 자원 이용효율 향상을 위한 계층적 간섭대응 핵심기술 개발"을 목표로 연구를 수행하고 있는 숭실대학교 인지무선통신연구소에 대하여 소개하고, 연구소에 포함된 각 연구실에서 진행하고 있는 연구에 대해서 소개한다.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06a
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• pp.422-425
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• 2011

IPTV와 같은 멀티미디어 트래픽의 이용량이 증가함에 따라, 멀티미디어 서비스의 품질을 향상시키기 위한 스트리밍 전송 기법들이 연구되고 있다. 기존 연구들은 네트워크 상태를 고려한 스트리밍 전송으로 네트워크의 효율성과 공정성을 향상시켜 서비스 품질(QoS)을 보장하지만 사용자가 인지하는 체감 품질(QoE)을 동시에 보장하지 못하는 한계를 가지고 있다. 본 논문에서는 스트리밍 서비스의 체감 품질을 향상시키기 위해 비디오의 품질을 단계적으로 변화시키는 스트리밍 기법을 제안한다. 제안하는 기법은 수식 기반의 TCP(Transmission Control Protocol) 전송률을 기반으로 네트워크 상태를 측정하여 단계적으로 품질을 조절하고, 일정시간 동안 품질 조절의 수행을 제한한다. 이를 통해 급변하는 네트워크 상태 변화에 따른 잦은 품질 변화를 피하여 체감 품질을 향상시킨다. 실험을 통해 제안하는 기법의 유효성을 확인하였다.

• Proceedings of the Korean DIstribution Association Conference
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• 2006.05a
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• pp.141-164
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• 2006

오늘날 새로운 마케팅 기법으로서 고객중심적인 체험마케팅의 중요성이 증대되고 있다. 본 연구는 여성화장품 소비자의 체험마케팅이 브랜드 인식에 미치는 영향을 파악하는데 목적을 두고 있다. 연구는 설문조사를 통해 수행하였으며 설문조사는 국내 한 화장품회사의 체험행사에 참여한 여성으로 하였다. 설문은 체험마케팅 참여 전과 후로 나누어 두 차례 동일한 상대를 조사하여 그 결과를 비교하였으며, 연구결과 첫째, 체험마케팅 행사 참여 후 브랜드인지도의 향상은 유의한 것으로 나타났고. 둘째, 체험마케팅 행사 참여 후 브랜드 신뢰도도 유의하게 향상된 것으로 나타났다, 셋째, 체험마케팅 행사 참여 후 브랜드충성도도 유의하게 향상된 것으로 나타났고 넷째, 체험마케팅 행사 참여 후 브랜드이미지도 유의하게 향상된 것으로 나타났다. 따라서 본 연구는 소비자의 브랜드 인식을 향상하는데 있어 체험마케팅의 효과가 입증되었다.

• Journal of the Korean Society of Food Science and Nutrition
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• v.43 no.3
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• pp.360-366
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• 2014

Kimchi is a Korean traditional fermented food with various health functionalities. However, the protective effects of kimchi against Alzheimer's disease (AD) have not been studied yet. In this study, the protective activities of kimchi extract against oxidative stress and AD were investigated in an amyloid beta ($A{\beta}$)-induced AD model using ICR mice. Kimchi extract exerted strong scavenging activities against 1,1-diphenyl-2-picrylhydrazyl and hydroxyl radical. In addition, T-maze, object cognition, and water maze tests were carried out using the AD model. The $A{\beta}_{25-35}$-injected groups showed impairment of cognition and memory. However, the abilities of novel object recognition and new route awareness were improved by administration of kimchi extract (100 and 200 mg/kg/day) for 2 weeks. Furthermore, the results on water maze test indicated that kimchi extract exerted protective activity against cognitive impairment induced by $A{\beta}_{25-35}$. The present study suggested that kimchi protected against $A{\beta}$-induced impairment of memory and cognition as well as attenuated oxidative stress.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.10
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• pp.7078-7088
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• 2015

This study examined effects of health behaviors and sleep related factor on cognitive function in the elderly hypertensive patients. Data were collected through a face to face interview survey with structured questionnaire form 140 elderly with hypertension ($age{\geq}65years$) from February 5 to May 1, 2013. Research instruments included Pittsburgh Sleep Quality Index(PSQI), Epworth Sleepiness Scale(ESS) and Korean version the Mini-Mental State Examination(MMSE-K). Cognitive function was negatively related to degradation in quality of sleep(r=-.29, p<.001). Sleep duration were negatively related to body mass index(r=-.18, p=.032) and degradation in quality of sleep(r=-.59, p<.001). Sleep duration was positively related to daytime sleepiness(r=.22, p=.008). Hierarchical multiple regression showed that age, education levels and living arrangement were associated with cognitive function(F=8.56, p<.001, Adjusted $R^2=.14$). After controlling for demographic characteristics and health behaviors, degradation in quality of sleep(${\beta}=-.27$, p=.008) was identified as significant predictors of cognitive function. This final model explained 17.0% of the cognitive function in the elderly hypertensive patients(F=4.09, p<.001). Therefore, as a strategy improving cognitive function of the elderly with hypertension, therapeutic intervention should be developed to improve quality of sleep considering age, education levels and living arrangement.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.5
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• pp.3344-3352
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• 2015

The purpose of this study is to investigate the effects of Korean computer-based cognitive rehabilitation program (CoTras) on frontal-executive functions in patients with traumatic brain injury (TBI). This study was performed at C hospital in Changwon, Gyeongsangnam-do, Korea from August 2013 to March 2014. Ten patients with TBI were randomly divided into two groups. The experimental group had been given CoTras once a day, five times a week for four weeks, whereas the control group had performed self-cognitive training under the same conditions. To verify the effect of intervention, the following executive function measures were used: Korean Montreal Cognitive Assessment (K-MoCA), Executive Clock Drawing Test (ECDT), Trail Making Test (TMT), Rey-Complex Figure Test (RCFT). Intervention group showed significant increase in K-MoCA, TMT, RCFT-delayed recall (p<.05). However, control group showed no significant change in any test. There was significant difference of changed scores (post test-pre test) between two groups in K-MoCA, TMT and RCFT-delayed recall (p<.05). This study showed that CoTras is effective to improve frontal-executive functions in patients with traumatic brain injury.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.19 no.6
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• pp.677-687
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• 2008

CR technology is an intelligent technology which can sense the spectrum environment an adaptively adjust the parameters for wireless transmission. In this paper, by using CR-UWB, the spectrum efficiency of the transmission channel is largely improved; Furthermore, the interference to other system can be effectively avoided. In this paper, we propose a solution on interference problem of UWB system using cognitive radio. We use interference temperature model of cognitive radio that has proposed by FCC for estimating interference signal. Calculating channel capacity of UWB system with interference temperature, we suggest how to solve interference problem. We have used genetic algorithm in cognitive engine's calculation precess. The proposed UWB System with cognitive radio shows very efficient in solving interference problem.