• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권2호
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• pp.295-311
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• 2023

Cloud computing has evolved significantly, intending to provide users with fast, dependable, and low-cost services. With its development, malicious users have become increasingly capable of attacking both its internal and external security. To ensure the security of cloud services, encryption, authorization, firewalls, and intrusion detection systems have been employed. However, these single monitoring agents, are complex, time-consuming, and they do not detect ransomware and zero-day vulnerabilities on their own. An innovative Record and Replay-based hybrid Honeynet (R2NET) system has been developed to address this issue. Combining honeynet with Record and Replay (RR) technology, the system allows fine-grained analysis by delaying time-consuming analysis to the replay step. In addition, a machine learning algorithm is utilized to cluster the logs of attackers and store them in a database. So, the accessing time for analyzing the attack may be reduced which in turn increases the efficiency of the proposed framework. The R2NET framework is compared with existing methods such as EEHH net, HoneyDoc, Honeynet system, and AHDS. The proposed system achieves 7.60%, 9.78%%, 18.47%, and 31.52% more accuracy than EEHH net, HoneyDoc, Honeynet system, and AHDS methods.

• 한국산업정보학회논문지
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• 제17권1호
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• pp.47-62
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• 2012

만성질환 관리 서비스가 활성화되기 위해서는 유헬스 플랫폼을 중심으로 서비스 콘텐츠 개발자, 서비스 제공자, 디바이스 공급자 등이 긴밀하게 협력하여 가치사슬을 형성하는 생태계가 구축되어야 한다, 그러나 기존 유헬스 플랫폼은 안전하고 효율적인 개인건강기록 (PHR) 관리, 맞춤형 지능형 서비스 지원, N 스크린 서비스 지원 등의 부족으로 효과적인 생태계 구축이 어렵다. 이 논문에서는 이러한 유헬스 플랫폼의 문제점을 개선하기 위해 새로운 '만성질환 관리 플랫폼(CDMP: Chronic Disease Management Platform)'을 제안한다. CDMP는 만성질환 건강관리 증진 서비스를 개발 실행 공유하기 위한 공통 기능을 컴포넌트로 제공하고 다양한 서비스 및 시스템 간의 연결.통합을 위한 허브 기능을 수행하는 소프트웨어 플랫폼이다 CDMP는 SOA 기반으로 설계되어 높은 재사용성 확장성을 제공하며 정보 콘텐츠 서비스를 누구나 쉽게 이용할 수 있도록 Open API를 제공하는 개방형 플랫폼, N스크린 서비스를 위한 멀티플랫폼, SNS와의 연동을 통한 자가관리 기능을 지원한다. 이 논문에서는 CDMP 개발을 위한 요구사항 분석, 구조 설계, 설계 검증을 위한 프로토타입 구현을 수행하고, 특히 PHR 정보 관리를 위한 '하이브리드 데이터 모델'의 구현과 성능 평가를 통해 CDMP의 우수성을 검증하였다.

• 한국안전학회지
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• 제29권5호
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• pp.15-21
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• 2014

The aim of this work is conduct the study on light weight and structural performance improvement of the composite wind power blade. GFRP (Glass Fiber Reinforced Plastic) pre-empted by CFRP(Carbon Fiber Reinforced Plastic), the major material of wind power blade, was identified the superiority of mechanical performance through the tensile and fatigue test. SENT(Single Edge Notched Tension) specimen fracture test was conducted on the specimen that laminated together 2 ply CFRP with 4 ply GFRP through DIC(Digital Image Correlation) analysis. The SENT specimen thickness and $a_0/W$ ratio is 1.45 mm and 0.2, respectively. The fracture test accomplished with displacement control with 0.1 mm/min at the room temperature. The experimental apparatus used for the fracture test consisted of a 50kN universal dynamic tester and CCD camera connected to a personal computer (PC), which was used to record images of the specimen surface. Following data acquisition, the images and load-displacements were transferred to the PC, on which the DIC software was implement. The experiment and DIC analysis results show that CFRP/GFRP laminated composite exhibits improvement of the strength, compared with that of the existing blade material. This study shows the result that the strength of CFRP rotor blade of wind turbine satisfies through the experimental and DIC method.

• 한국자원식물학회지
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• 제33권5호
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• pp.476-481
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• 2020

한반도 미기록식물인 얼치기대가래(Potamogeton × anguillanus Koidz.)를 강원도 영월군 남면 연당리 연당천에서 발견하였다. 얼치기대가래는 대가래(P. wrightii Morong)와 넓은잎말(P. perfoliatus L.)의 자연교잡종이다. 대가래에 비해 잎자루가 짧고, 넓은잎말에 비해 잎이 좁고 길며, 밑부분이 줄기를 완전히 감싸지 않는 특징으로 구별된다. 본 미기록식물의 국명은 교잡종임을 고려하여 얼치기대가래로 신칭하였다. 주요 형질에 대한 기재와 화상자료 및 검색표를 제시하였다.

• 대한전자공학회논문지
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• 제8권6호
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• pp.8-16
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• 1971

본 논문은 원자로 또는 방사성 동위요소등에서 방사되는 방사선의 계수률을 선형적으로 미터로 지시할 수 있는 동시에 기록계로도 기록할 수 있는 완전 트랜지스터화된 선형 계수률계의 개발에 관한 연구이다. 이 계수률계는 양호한 안정을 위하여 트랜지스터 Chopper를 사용하였다. 교류증폭기의 입력단에는 높은 입력저항을 주기 위하여 composite emitter follower buffer stage를 사용하였으며 hybrid parameter 등가회로를 구성하여 해석하였다. 계수률은 수 CPS로 부터 100KCPS까지 4개 영역으로 나누어서 선형적으로 계수할 수 있으며 분해능은 0.5μsec 미만이고 상온에서의 출력 drift는 7시간 계속동작시켰을시에 ±0.5μA 정도이다.

• International Journal of Quality Innovation
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• 제3권2호
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• pp.138-158
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• 2002

Nowadays, new product development (NPD) is one of the most crucial factors for business success. The manufacturing firms cannot afford the resources in the long development cycle and the costly redesigns. Good product planning is crucial to ensure the success of NPD, while the Quality Function deployment (QFD) is an effective tool to help the decision makers to determine appropriate product specifications in the product planning stage. Traditionally, in the QFD, the product specifications are determined by a rather subjective evaluation, which is based on the knowledge and experience of the decision makers. In this paper, the traditional QFD methodology is firstly reviewed. An improved Hybrid Quality Function Deployment (HQFD) [MSOfficel] then presented to tackle the shortcomings of traditional QFD methodologies in determining the engineering characteristics. A structured questionnaire to collect and analyze the customer requirements, a methodology to establish a QFD record base and effective case retrieval, and a model to more objectively determine the target values of engineering characteristics are also described.

• Restorative Dentistry and Endodontics
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• 제47권1호
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• pp.5.1-5.11
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• 2022

Objectives: This study aimed to assess the clinical longevity of a bulk-fill resin composite in Class II restorations for 3-year. Materials and Methods: Patient record files acquired from the 40 patients who were treated due to needed 2 similar sizes Class II composite restorations were used for this retrospective study. In the experimental cavity, the flowable resin composite SDR was inserted in the dentinal part as a 4 mm intermediate layer. A 2 mm coverage layer with a nano-hybrid resin composite (CeramX) was placed on SDR. The control restoration was performed by an incremental technique of 2 mm using the nano-hybrid resin composite. The restorations were blindly assessed by 2 calibrated examiners using modified United States Public Health Service criteria at baseline and 1, 2, and 3 years. The data were analyzed using non-parametric tests (p = 0.05). Results: Eighty Class II restorations were evaluated. After 3-years, 4 restorations (5%) failed, 1 SDR + CeramX, and 3 CeramX restorations. The annual failure rate (AFR) of the restorations was 1.7%. The SDR + CeramX group revealed an AFR of 0.8%, and the CeramX group an AFR of 2.5% (p > 0.05). Regarding anatomical form and marginal adaptation, significant alterations were observed in the CeramX group after 3-years (p < 0.05). The changes in the color match were observed in each group over time (p < 0.05). Conclusions: The use of SDR demonstrated good clinical durability in deep Class II resin composite restorations.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2021년도 제64차 하계학술대회논문집 29권2호
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• pp.305-307
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• 2021

Alzheimer's Disease (AD) is a cognitive disorder characterized by memory impairment that can be assessed at early stages based on administering clinical tests. However, the AD pathophysiological mechanism is still poorly understood due to the difficulty of distinguishing different levels of AD severity, even using a variety of brain modalities. Therefore, in this study, we present a hybrid EEG-fNIRS modalities to compensate for each other's weaknesses with the help of Machine Learning (ML) techniques for classifying four subject groups, including healthy controls (HC) and three distinguishable groups of AD levels. A concurrent EEF-fNIRS setup was used to record the data from 41 subjects during Oddball and 1-back tasks. We employed both a traditional neural network (NN) and a CNN-LSTM hybrid model for fNIRS and EEG, respectively. The final prediction was then obtained by using majority voting of those models. Classification results indicated that the hybrid EEG-fNIRS feature set achieved a higher accuracy (71.4%) by combining their complementary properties, compared to using EEG (67.9%) or fNIRS alone (68.9%). These findings demonstrate the potential of an EEG-fNIRS hybridization technique coupled with ML-based approaches for further AD studies.

• 한국CDE학회논문집
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• 제1권1호
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• pp.20-32
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• 1996

The boundary evaluation technique for Boolean operation on non-manifold models which is regarded as the most popular and powerful method to create and modify 3-D CAD models has been developed. This technique adopted the concept of Merge and Selection in which the CSG tree for Boolean operation can be edited quickly and easily. In this method, the merged set which contains complete information about primitive models involved is created by merging primitives one by one, then the alive entities are selected following the given CSG tree. This technique can support the hybrid representation of B-rep(Boundary Representation) and CSG(Constructive Solid Geometry) tree in a unified non-manifold model data structure, and expected to be used as a basic method for many modeling problems such as data representation of form features, and the interference between them, and data representation of conceptual models in design process, etc.

• 한국정밀공학회지
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• 제18권2호
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• pp.146-151
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• 2001

The effects of slant interface in the hybrid specimen on the dynamic crack propagation behavior have been investigated using dynamic photoelasticity. The dynamic photoelasticity with the aid of Cranz-Shardin type high speed camera system is utilized to record the dynamic stress field around the dynamically propagating inclined interface crack tip in the three point bending specimens. The dynamic load is applied by a hammer dropped from 0.08m high without initial velocity. The dynamic crack propagation velocities and dynamic stresses field around the interface crack tips are investigated. Theoretical dynamic isochromatic fringe loops are compared with the experimental reults. It is interesting to note that the crack propagating velocity becomes comparable to the Rayleigh wave speed of the soft material of a specimen when slant angle decreases.