• Electronics and Telecommunications Trends
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• v.22 no.3 s.105
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• pp.29-37
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• 2007

RFID 기술은 반도체 기술의 발전과 인터넷의 등장으로 인하여 지난 10여 년 동안 꾸준한 발전을 해왔으며 유통, 물류, 의료, 교육 등 다양한 분야에 적용되고 있다. 이는 향후 수 년 내에 거의 모든 물품에 태그를 부착하게 됨에 따라 유비쿼터스 환경 구축에 큰 기여를 할 것으로 기대된다. 이러한 RFID 기술은 저주파(LF), 고주파(HF), 초고주파(UHF) 및 마이크로파(M/W) 대역의 무선전파를 사용하며 각 대역의 전파 특성에 따라 동물추적, 교통카드, 물품관리, 전자화폐 등 다양한 분야에 선택적으로 적용되고 있으며, 단말기의 형태에 따라 고정형, 휴대형, 모바일 RFID 기술로 분류되고 최근에는 택시안심귀가서비스 등 휴대폰에 RFID 리더 기능이 결합된 모바일 RFID 서비스도 시범서비스를 선보이면서 우리 생활에 파고들고 있다. 또한 항만물류 관리 등과 같이 긴 인식거리가 필요한 능동형 RFID 기술을 포함하여 많은 연구와 실증실험, 시범서비스나 본사업이 이루어지고 있으며 최근에는 파렛, 케이스 단위가 아닌 물품 단위에 태그 부착을 위한 ILT 기술도 속속 선보이고 있다. 본 고에서는 시장전망이 가장 밝은 것으로 알려진 UHF 대역을 중점으로 RFID 기술을 살펴보고 이중에서도 모바일 RFID 기술을 포함한 수동형 RFID 기술, 능동형 RFID 기술 및 이와 관련한 표준화 동향을 알아본다.이를 활용한 응용 시스템에 대하여 간략히 살펴볼 것이다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.5
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• pp.901-906
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• 2006

In this paper, we describe the implementation of the digital photo frame system that displays the images coming through the memory card of a digital camera. Each image can be recorded with voice in this system, and a function of the mp3 player is implemented as well. We use Intel PXA255 to control the system and modify the bootloader and linux kernel. Also we adapt device driver for this system. For the realization of image display, voice recording and mp3 playing in the basis of the linux system, we program some of the Microwindows system configuration files and program applications here. This study will be a good example to access the development of the digital photo frame based on the linux system using less-power and high performed embedded processor.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.18 no.2
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• pp.139-150
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• 2008

Recently, financial institutes and industrial companies are adopted to security token such as OTP, smart card, and USB authentication token and so on for secure system management and user authentication. However, some research institutes have been introduced security weaknesses and problems in security tokens. Therefore, in this paper, we analyses of security functions and security requirements in security token performed by analyses of standardization documents, trends, security problems, attack methods for security tokens. Finally, we propose a CC v.3.1 based security token protection profile.

• The Korean Journal of Archival Studies
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• no.75
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• pp.91-134
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• 2023

The presidential records of the participatory government transferred to the Presidential Archives are the result of innovation in the record production system symbolized by the document management card of the e-jiwon system. Records reveal the policy-making process by documenting the decision-making process. This study identified the existing forms of records related to records management innovation produced by the Office of the Records Management Secretary at the Office of the President, and reorganized them into functions-activities-subjects-actions. Thematic record types help to systematically understand the evolution of the matter and the nature of the record. The characteristics of each record were identified by writing detailed information on the record. These attempts are meaningful in that they provide basic data for the evaluation and use of presidential records.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.718-721
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• 2011

웹 서비스를 대상으로 하는 DDoS(Distributed Denial-of-Service) 공격 또는 유해 트래픽 유입을 탐지 또는 차단하기 위한 목적으로 HTTP(Hypertext Transfer Protocol) 트래픽을 실시간으로 분석하는 기능은 거의 모든 네트워크 트래픽 보안 솔루션들이 탑재하고 있는 필수적인 요소이다. 하지만, HTTP 트래픽의 실시간 데이터 측정 양이 시간이 지날수록 기하급수적으로 증가함에 따라, HTTP 트래픽을 실시간 패킷 단위로 분석한다는 것에 대한 성능 부담감은 날로 커지고 있는 실정이다. 이제는 응용 어플리케이션 차원에서는 성능에 대한 부담감을 해소할 수 없기 때문에 고비용의 소프트웨어 가속기나 하드웨어에 의존적인 전용 장비를 탑재하여 해결하려는 시도가 대부분이다. 본 논문에서는 현재 대부분의 PC 에 탑재되어 있는 그래픽 카드의 GPU(Graphics Processing Units)를 범용적으로 활용하고자 하는 GPGPU(General-Purpose computation on Graphics Processing Units)의 연구에 힘입어, NVIDIA사의 CUDA(Compute Unified Device Architecture)를 사용하여 네트워크 트래픽에서 HTTP 패킷 추출성능을 응용 어플리케이션 차원에서 향상시켜 보고자 하였다. HTTP 패킷 추출 연산만을 기준으로 GPU 의 연산속도는 CPU 에 비해 10 배 이상의 높은 성능을 얻을 수 있었다.

• Convergence Security Journal
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• v.22 no.4
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• pp.179-188
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• 2022

Password authentication schemes (PAS) are the most common mechanisms used to ensure secure communication in open networks. Mathematical-based cryptographic authentication schemes such as factorization and discrete logarithms have been proposed and provided strong security features, but they have the disadvantage of high computational and message transmission costs required to construct passwords. Fairuz et al. therefore argued for an improved cryptographic authentication scheme based on two difficult fixed issues related to session key consent using the smart card scheme. However, in this paper, we have made clear through security analysis that Fairuz et al.'s protocol has security holes for Privileged Insider Attack, Lack of Perfect Forward Secrecy, Lack of User Anonymity, DoS Attack, Off-line Password Guessing Attack.

• Korean Journal of Psychosomatic Medicine
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• v.25 no.1
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• pp.63-72
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• 2017

Objectives : Attention-deficit hyperactivity disorder(ADHD) is characterized by significant impairments in executive functions, with a prevalence of approximately 3-5% of all children worldwide. The goal of this study was to examine the relationship between executive functions and electrophysiological activities in children and adolescents with ADHD. Methods : In 31 patients with ADHD, resting-state EEG was recorded, and Comprehensive Attention Test(CAT), Stroop Color-Word Inference Test(Stroop CWIT), Trail Making Test(TMT), and Wisconsin Card Sorting Test(CST) were administered. Korean version of the ADHD Rating Scale(K-ARS) was assessed. Results : Alpha and beta power positively correlated with the Attention Quotient(AQ), while delta power negatively correlated with AQ from CAT. In the Stroop CWIT, decreased delta power and increased beta power were related to higher performance. Power of the alpha band increased with higher TMT performance. Moreover, delta power negatively correlated with good performance on the CST, while alpha and high gamma band showed a positive correlation. Correlation with the parent-rating of ADHD symptoms showed a negative correlation between alpha power and higher scores on the K-ARS. Conclusions : These findings indicate that relative power in higher frequency bands of EEG is related to the higher executive function in children and adolescents with ADHD, while the association with the relative power in lower frequency bands of EEG seem to be vice versa. Furthermore, the findings suggest that QEEG may be a useful adjunctive tool in assessing patients with ADHD.

• Journal of Internet Computing and Services
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• v.6 no.4
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• pp.125-139
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• 2005

Mobile e-business is in wide use with the rapid growth of wireless internet users. To meet the growing requests for mobile e-business the productivity of mobile applications has been demanded. The WAPSiteGen, introduced in this paper, automatically generates a 3-tier WAP application that needs a new application database or that already has an application database to increase the productivity. The WAPSiteGen generates the EJB components that handle business logic and the JSP Web components that process user-made queries and the WAP Push feature. For a presentation layer, it also generates the HTML forms for an application manager and the WML decks for end users, which consists of many cards. The WAPSiteGen enhances extendibility, reusability and portability of generated 3-tier applications by comprising such component technologies as EJB and JSP. Furthermore, it supports the WAP Push services for generated applications that provide necessary information to wherever and at whenever a user wants. Since the applications generated by the WAPSiteGen provide the information on an interested entity as well as the information on all the directly or indirectly related entities to the interested one, it shows faster information accessibility. In this paper, we explain the functionality and implementation of the WAPSiteGen and then show its merits by comparing the WAPSiteGen to commercial WAP application generators.

• Journal of Chest Surgery
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• v.36 no.12
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• pp.929-936
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• 2003

We analysed the surgical outcomes of immediate reoperations after mitral valve repair. Material and Method: Eighteen patients who underwent immediate reoperation for failed mitral valve repair from April 1995 through July 2001 were reviewed retrospectively. There were 13 female patients. The mitral valve disease was regurgitation (MR) in 12 patients, stenosis (MS) in 3, and mixed lesion in 3. The etiologies of the valve disease were rheumatic in 9 patients, degenerative in 8, and endocarditis in 1. The causes of reoperation was residual MR in 13 patients, residual MS in 4, and rupture of left ventricle in 1. Fourteen patients had rerepair for residual mitral lesions (77.8%) and four underwent replacement. Result: There was no early death. After mean follow-vp of 33 months, there was one late death. Echocardiography revealed no or grade 1 of MR (64.3%) in 9 patients and no or mild MS in 11 patients (78,6%). Reoperation was done in one patient. The cumulative survival and freedom from valve-related reoperation at 6 years were 94% and 90%, respectively. The cumulative freedom from recurrent MR and MS at 4 years were 56% and 44%, respectively. Conclusion: This study suggests that immediate reoperation for failed mitral valve repair offers good early and intermediate survival, and mitral valve rerepair can be successfully performed in most of patients. However, because mitral rerepair have high failure rate, especially in rheumatic valve disease, adequate selections of valvuloplasty technique and indication are important to reduce the failure rate of mitral rerepair.

• Sleep Medicine and Psychophysiology
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• v.5 no.1
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• pp.54-70
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• 1998

Objectives : The purpose of this study is to evaluate the role of structural and functional changes of the brain in the pathophysiology of schizophrenia. Methods : The authors measured the regions of interest on the magnetic resonance imaging of the brain in 20 patients with paranoid schizophrenia(15 men and 5 women) and 23 control subjects(15 men and 8 women). We also assessed the neurocognitive functions with the Wisconsin Card Sorting Test, the Benton Neuropsychological Assessment, and the Weschler IQ test-Korean version, soft neurologic signs, and psychiatric symptoms in the patient group. Results : In the patient group, all ventricles and basal ganglia including caudate nucleus and globus pallidus were significantly enlarged. Although there were no significant differences between the two groups in the values of right frontal lobe and left temporal lobe, there was a tendency of decrease in the values of right frontal lobe and left temporal lobe. There were significant positive correlations between the values of ventricles and the frequency of previous hospitalization. However, there were no significant correlations between other values of regions of interest and clinical data. The value of the right frontal lobe was significantly correlated with the score of soft neurologic signs, which is suggestive of the neurodevelopmental abnormalities. There were significant correlations between the value of frontal lobe and the scores of the various subscales of Benton Neuropsychiatric Inventory. In contrast, the value of left amygdala and putamen showed significant correlation with the score of verbal IQ on the Weschler IQ test. Structural changes of the temporal lobe areas were related with the positive and general symptom scores on PANSS, while those of the basal ganglia were related with the negative symptom scores. Conclusions : These results suggest that the structural changes of the brain in the patients with schizophrenia show the dual process, which is suggestive that the enlarged ventricle show the neurodegenerative process, while enlarged basal ganglia, and shrinked right frontal and left temporal lobe show the neurodevelopmental abnormalities. Among these changes, structural changes of the frontal lobe related with various neuropsychological deficits, while those of left temporal lobe related with language abnormality. Relative to the relation between structural changes and psychiatric symptoms, structural changes of the temporal lobe areas were related with the positive and general symptoms, while those of the basal ganglia were related with the negative symptoms.