• 제목/요약/키워드: software reliability

검색결과 1,510건 처리시간 0.028초

Research on the application of Machine Learning to threat assessment of combat systems

  • Seung-Joon Lee
    • 한국컴퓨터정보학회논문지
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    • 제28권7호
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    • pp.47-55
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    • 2023
  • 본 논문에서는 전투체계 위협지수를 머신러닝 모델 중 Gradient Boosting Regreesor, Suppor Vector Regressor를 통해 예측하는 방법을 제시한다. 현재 전투체계는 안전성과 신뢰성이 중시되는 소프트웨어이므로 신뢰성이 보장되지 않은 AI 기술의 적용을 정책상 제한하고 있으며, 이로 인하여 전력화된 국내 전투체계는 AI 기술을 탑재하고 있지 않다. 하지만 AI의 전력화를 목표로 하는 국방부의 정책 방향에 대응하기 위하여, 전투체계의 머신러닝 적용에 필요한 기반 기술을 확보하기 위한 연구를 실시하였다. 이 연구는 위협지수 평가에 필요한 데이터를 수집한 뒤 데이터 가공 및 정제, 머신러닝 모델 선정 및 최적의 하이퍼 파리미터를 선정하여 학습된 모델의 예측 정확도를 판단하였다. 그 결과 테스트 데이터에 대한 모델 점수가 99점 이상으로 도출되었으며 전투체계에 머신러닝 모델의 적용 가능성을 확인하였다.

대학생의 사회적 지지와 희망이 삶의 만족도에 미치는 영향: 외동자녀 지위의 조절매개 모형 (Effects of Social Support and Hope on Life Satisfaction of College Students: Moderated Mediation Model of Only-Child Status)

  • 마팅팅;이창식
    • 산업진흥연구
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    • 제8권3호
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    • pp.211-219
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    • 2023
  • 본 연구의 목적은 대학생의 사회적 지지와 삶의 만족도 간의 관계에서 희망의 매개효과를 외동자녀 지위가 조절 매개하는지를 규명하고자 하였다. 본 연구의 대상은 중국 광둥성의 한 대학에서 의도적으로 표집한 302명의 대학생이다. 자료는 SPSS PC+ Win ver. 25.0과 SPSS PROCESS macro ver. 4.2를 활용하여 분석하였으며, 적용된 통계 기법은 빈도분석, 신뢰도분석, 상관관계분석, 조절된 매개효과 분석이다. 연구 결과 첫째, 사회적지지, 희망, 삶의 만족도 간에 정적인 유의미한 상관관계가 있었다. 둘째, 조절된 매개효과 분석 결과 외동자녀가 그렇지 않은 자녀에 비해 사회적 지지가 희망을 경유하여 삶의 만족도에 미치는 간접효과가 높았다. 이를 바탕으로 삶의 만족도 향상을 위한 제언을 하였다.

중국 소비자의 라이프스타일이 애슬레저웨어 추구혜택과 구매의도에 미치는 영향 (Effect of Chinese Consumers' Lifestyle on Pursuing Benefits and Purchase Intention for Athleisure Wear)

  • 장분용;오경화
    • 한국의상디자인학회지
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    • 제25권1호
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    • pp.1-13
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    • 2023
  • This study examines the effects of Chinese consumers' lifestyles on pursuing the benefits and purchase intentions for athleisure wear. Chinese female consumers aged 20 to 40 in Shanghai and Chengdu, who have purchased athleisure wear were selected for a survey, and 510 questionnaires were collected. Data was analyzed using SPSS 26.0 software. Factor analysis, reliability verification, regression analysis, and discrete analysis were performed. As a result, Chinese consumers' lifestyles were classified into three categories: 'personality orientation', 'show-off orientation', and 'health orientation'. There were four benefits: 'situation pursuit', 'practicality pursuit', 'fashion style pursuit', and 'appearance pursuit' for athleisure wear. Among the lifestyle types of Chinese consumers, "individuality-oriented" showed a positive effect on "pursuit of practicality", "pursuit of situation", "pursuit of fashion style", and "pursuit of appearance" among the benefits of pursuing athleisure wear. Next, among lifestyle types, 'show-off orientation' showed a positive effect on 'individuality' and 'appearance pursuit'. Finally, among lifestyle types, 'health-oriented' showed a positive effect on 'pursuit of practicality' and 'pursuit of appearance'. On the other hand, Chinese consumers' lifestyle types of "show-off," "health-oriented," and "individuality-oriented" all exhibited a significant impact on their purchase intention for athleisure wear. According to age groups and location, there is no significant difference in terms of 'lifestyle', 'athleisure wear pursuit benefits' and 'purchase intention'. Compared married women and unmarried women, it was found that unmarried women value their health and leisure, while those with a lower their educational background, considered the lifestyle of "individuality-oriented" and "show-off-oriented", as well as "situation-pursuit", "practicality", and "fashion style pursuit".

Super app marketplace 전략을 위한 소비자 유형화 - 쇼핑 성향을 중심으로 - (The classification of super app consumer for marketplace strategy - Focusing on the shopping orientations -)

  • 김해정;이영주
    • 복식문화연구
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    • 제31권3호
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    • pp.330-345
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    • 2023
  • This study aimed to categorize consumers using super app functional characteristics to identify demographic differences, and analyze shopping orientations by consumer type. This data can be used by fashion and beauty companies for product planning and marketing strategies. To categorize super app consumers, data were analyzed with SPSS v.26.0 software using frequency, factor, reliability K-mean cluster, and distributed analyses, one-way-ANOVAs, and Scheffe verification. Cross-analysis was conducted to correlate super app consumer types with demographic characteristics. One-way-ANOVAs and Scheffe verification were used to analyze the differences in shopping preferences between super app consumer groups. As a result of our analyses, super app consumers were classified into four types: the ration type, the low-use type, the multifunction type, and the habit type. There were statistically significant differences between these types in age, occupation, marital status, average monthly household income, and shopping impact factors. Five super app user shopping orientations were identified: brand pursuit, pleasure pursuit, trend pursuit, risk perception, and economic orientation. The differences in the preferred orientation between super app consumer types were found to be statistically significant. The majority of respondents were multifunction type consumers. This group used the super app most frequently and effectively. They also demonstrated the highest scores for all five of the shopping orientations. The classification of consumer types in this study will allow the fashion and beauty industries to utilize super apps for more targeted product design and marketing.

A Study on Access Control Technique for Provision of Cloud Service in SSO-based Environment

  • Eun-Gyeom Jang
    • 한국컴퓨터정보학회논문지
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    • 제28권11호
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    • pp.73-80
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    • 2023
  • 본 논문은 클라우드 서비스 시장을 활성화하기 위해 중요 정보의 접근을 보호하는 기술을 제안하였다. 클라우드 서비스 시장의 여러가지 저해요소 중에 클라우드 시스템에 저장되는 중요한 대외비 및 개인정보가 유출될 수 있는 문제를 해결하기 위한 기술을 제안하였다. 클라우드 서비스 제공자와 일반 사용자가 클라우드 자원에 대한 접근을 통제하여 중요 정보를 보호 할 수 있도록 하였다. 시스템 관리자는 시스템의 유지 및 관리를 위해 슈퍼유저의 권한을 갖는다. 클라이언트 컴퓨팅 서비스는 외부의 클라우드 서비스 공급자가 관리하고 정보 또한 외부시스템에 저장된다. 이러한 환경으로부터 사내의 중요 정보를 보호하기 위해 클라우드 서비스 공급자를 포함한 모든 사용자가 인증을 받고 자원을 접근할 수 있도록 하였다. 제안한 접근통제 기술을 통해 클라우드 컴퓨팅 자원에 대한 기밀성과 신뢰성 서비스를 제공하여 클라우드 서비스 시장의 활성화를 기대한다.

블록체인 기반 온라인 시험 부정행위 탐지 시스템 (A Blockchain-Based Cheating Detection System for Online Examination)

  • 남구모;박지수;손진곤
    • 정보처리학회논문지:소프트웨어 및 데이터공학
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    • 제11권6호
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    • pp.267-272
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    • 2022
  • 온라인 시험은 시간과 공간에 제약이 없다. 수험자의 시험 장소가 별도로 필요하지 않고, 시험 장소로의 이동에 필요한 시간과 비용이 들지 않는다는 장점이 있다. 그러나 온라인 시험은 개별적 환경에서 시험을 진행하기 때문에 다양한 부정행위가 가능하다는 단점이 있다. 그리고 시험 감독 방법이 부족하여 부정행위 탐지에 어려움이 있다. 또 시험 과정과 결과 데이터가 디지털 데이터로만 존재하여 시험 결과 위조 여부 확인을 위해 매건 해당 시험 결과가 저장된 서버에서 직접 확인해야 하는 번거로움이 있고 악의적으로 시험과 관련 데이터를 변경한 경우 진위 확인이 불가하다. 본 연구에서는 부정행위 탐지를 위해 시험 진행 관련 데이터를 블록체인에 저장하는 블록체인 기반 온라인 시험 부정행위 탐지 시스템을 개발하여 온라인 시험의 신뢰도를 높이고자 하였다. 실험을 통해 시험 결과 위변조 부정행위가 탐지됨을 확인하였다.

Diagnostic performance of stitched and non-stitched cross-sectional cone-beam computed tomography images of a non-displaced fracture of ovine mandibular bone

  • Farzane Ostovarrad;Sadra Masali Markiyeh;Zahra Dalili Kajan
    • Imaging Science in Dentistry
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    • 제53권4호
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    • pp.375-381
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    • 2023
  • Purpose: This study assessed the diagnostic performance of stitched and non-stitched cross-sectional cone-beam computed tomography (CBCT) images of non-displaced ovine mandibular fractures. Materials and Methods: In this ex vivo study, non-displaced fractures were artificially created in 10 ovine mandibles (20 hemi-mandibles) using a hammer. The control group comprised 8 hemi-mandibles. The non-displaced fracture lines were oblique or vertical, <0.5 mm wide, 10-20 mm long, and only in the buccal or lingual cortex. Fracture lines in the ramus and posterior mandible were created to be at the interface or borders of the 2 stitched images. CBCT images were obtained from the specimens with an 80 mm×80 mm field of view before and after fracture induction. OnDemand software (Cybermed, Seoul, Korea) was used for stitching the CBCT images. Four observers evaluated 56 (28 stitched and 28 non-stitched) images to detect fracture lines. The diagnostic performance of stitched and non-stitched images was assessed by calculating the area under the receiver operating characteristic curve (AUC). Sensitivity and specificity values were also calculated (alpha=0.05). Results: The AUC was calculated to be 0.862 and 0.825 for the stitched and non-stitched images, respectively (P=0.747). The sensitivity and specificity were 90% and 75% for the non-stitched images and 85% and 87% for the stitched images, respectively. The inter-observer reliability was shown by a Fleiss kappa coefficient of 0.79, indicating good agreement. Conclusion: No significant difference was found in the diagnostic performance of stitched and non-stitched cross-sectional CBCT images of non-displaced fractures of the ovine mandible.

지속가능한 농업 환경을 위한 블록체인과 AI 기반 빅 데이터 처리 기법 (Blockchain and AI-based big data processing techniques for sustainable agricultural environments)

  • 정윤수
    • 산업과 과학
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    • 제3권2호
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    • pp.17-22
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    • 2024
  • 최근 ICT분야가 다양한 환경에서 사용되면서 지속가능한 농업 환경에서는 ICT 기술들을 활용하여 농작물별 병충해 분석, 농작물 수확시 로봇 사용, 빅 데이터로 인한 예측 등이 가능해졌다. 그러나, 지속 가능한 농업 환경에서는 자원의 고갈, 농업 인구 감소, 빈곤 증가, 환경 파괴 등을 해결하기 위한 노력이 꾸준히 요구되고 있다. 본 연구에서는 지속 가능한 농업 환경 기반의 농작물의 생산 비용 감소 및 효율성을 증가하기 위한 인공지능 기반 빅 데이터 처리 기법을 제안한다. 제안 기법은 AI를 결합한 농작물의 빅 데이터를 처리함으로써 데이터의 보안성과 신뢰성을 강화하고, 더 나은 의사 결정과 비즈니스 가치 추출이 가능하다. 이는 다양한 산업과 분야에서 혁신적인 변화를 이끌어내고, 데이터 중심의 비즈니스 모델의 발전을 촉진할 수 있다. 실험과정에서 제안 기법은 다량의 데이터가 생성되나, 일일이 정답을 태깅하기 힘든 농장 현장에서, 소량의 데이터에 대해서만 정확한 정답을 부여하고, 정답이 부여되지 않은 다량의 데이터와 함께 학습하여, 다량의 정답 데이터로 학습했을 때와 유사한 성능(오차율:0.05 이내)이 나타났다.

Damage Detection and Damage Quantification of Temporary works Equipment based on Explainable Artificial Intelligence (XAI)

  • Cheolhee Lee;Taehoe Koo;Namwook Park;Nakhoon Lim
    • 인터넷정보학회논문지
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    • 제25권2호
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    • pp.11-19
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    • 2024
  • This paper was studied abouta technology for detecting damage to temporary works equipment used in construction sites with explainable artificial intelligence (XAI). Temporary works equipment is mostly composed of steel or aluminum, and it is reused several times due to the characters of the materials in temporary works equipment. However, it sometimes causes accidents at construction sites by using low or decreased quality of temporary works equipment because the regulation and restriction of reuse in them is not strict. Currently, safety rules such as related government laws, standards, and regulations for quality control of temporary works equipment have not been established. Additionally, the inspection results were often different according to the inspector's level of training. To overcome these limitations, a method based with AI and image processing technology was developed. In addition, it was devised by applying explainableartificial intelligence (XAI) technology so that the inspector makes more exact decision with resultsin damage detect with image analysis by the XAI which is a developed AI model for analysis of temporary works equipment. In the experiments, temporary works equipment was photographed with a 4k-quality camera, and the learned artificial intelligence model was trained with 610 labelingdata, and the accuracy was tested by analyzing the image recording data of temporary works equipment. As a result, the accuracy of damage detect by the XAI was 95.0% for the training dataset, 92.0% for the validation dataset, and 90.0% for the test dataset. This was shown aboutthe reliability of the performance of the developed artificial intelligence. It was verified for usability of explainable artificial intelligence to detect damage in temporary works equipment by the experiments. However, to improve the level of commercial software, the XAI need to be trained more by real data set and the ability to detect damage has to be kept or increased when the real data set is applied.

Curved finite strip and experimental study of thin stiffened composite cylindrical shells under axial compression

  • Mojtaba Rafiee;Hossein Amoushahi;Mehrdad Hejazi
    • Structural Engineering and Mechanics
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    • 제89권2호
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    • pp.181-197
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    • 2024
  • A numerical method is presented in this paper, for buckling analysis of thin arbitrary stiffened composite cylindrical shells under axial compression. The stiffeners can be placed inside and outside of the shell. The shell and stiffeners are operated as discrete elements, and their interactions are taking place through the compatibility conditions along their intersecting lines. The governing equations of motion are obtained based on Koiter's theory and solved by utilizing the principle of the minimum potential energy. Then, the buckling load coefficient and the critical buckling load are computed by solving characteristic equations. In this formulation, the elastic and geometric stiffness matrices of a single curved strip of the shell and stiffeners can be located anywhere within the shell element and in any direction are provided. Moreover, five stiffened composite shell specimens are made and tested under axial compression loading. The reliability of the presented method is validated by comparing its numerical results with those of commercial software, experiments, and other published numerical results. In addition, by using the ANSYS code, a 3-D finite element model that takes the exact geometric arrangement and the properties of the stiffeners and the shell into consideration is built. Finally, the effects of Poisson's ratio, shell length-to-radius ratio, shell thickness, cross-sectional area, angle, eccentricity, torsional stiffness, numbers and geometric configuration of stiffeners on the buckling of stiffened composite shells with various end conditions are computed. The results gained can be used as a meaningful benchmark for researchers to validate their analytical and numerical methods.