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Numerical Simulation of Cone Penetration Tests in Sand Ground Using Critical State Mohr Coulomb Plasticity Model (한계상태 Mohr Coulomb 소성 모델을 활용한 콘관입시험의 수치적 모사)

  • Woo, Sang Inn;Chung, Choong-Ki
    • Journal of the Korean Geotechnical Society
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    • v.35 no.2
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    • pp.37-51
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    • 2019
  • This study focuses on the numerical simulations of the cone penetration tests in a sand ground. The mechanical responses of sand were described using the modified Mohr Coulomb plasticity model based on the critical state soil mechanics. In the plasticity model, the dilatancy angle was not a constant, but a function of the distance to the critical state line from the current state of void ratio and mean effective stress. To simulate cone penetration tests numerically, this study relied on Lagrangian finite element method under the axisymmetric condition. To enable penetration of the cone penetrometer without tearing elements along the symmetric axis, the penetration guide concept was adopted in this study. The results of numerical simulations on the calibration chamber cone penetration tests had good agreement with the experimental results.

Analysis of RPG Characters' Personality Performance (RPG게임 캐릭터에서 개성 표현 요소에 관한 연구)

  • Shang, Jiong-Li;Ryu, Seuc-Ho
    • Journal of Digital Convergence
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    • v.19 no.2
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    • pp.403-408
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    • 2021
  • From the perspective that RPG games give players a sense of reality, the characterization of game characters can be said to be at the heart of design behavior. The personality of a unique character enhances the player's concern and commitment, allowing players to experience a variety of experiences. Through theoretical research and case analysis, this paper analyzes the expression of individuality in RPG game character design. In the RPG game, the way to express the character's individuality is first based on the game's time-space background, plot, task, etc. to inform the character's general gender, race, occupation, and skills. In line with the application and use of the characters, the roles will be developed in a concrete and rich way, and the shapes, movements, colors, costumes and weapons will be more refined. The purpose of this study is to obtain the main factors that influence RPG character's personality design from the viewpoint of perceptual design theory. In addition, it is proposed that the RPG game character personality design method should be adopted.

Battery-loaded power management algorithm of electric propulsion ship based on power load and state learning model (전력 부하와 학습모델 기반의 전기추진선박의 배터리 연동 전력관리 알고리즘)

  • Oh, Ji-hyun;Oh, Jin-seok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.24 no.9
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    • pp.1202-1208
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    • 2020
  • In line with the current era of the 4th Industrial Revolution, it is necessary to prepare for the future by integrating AI elements in the ship sector. In addition, it is necessary to respond to this in the field of power management for the appearance of autonomous ships. In this study, we propose a battery-linked electric propulsion system (BLEPS) algorithm using machine learning's DNN. For the experiment, we learned the pattern of ship power consumption for each operation mode based on the ship data through LabView and derived the battery status through Python to check the flexibility of the generator and battery interlocking. As a result of the experiment, the low load operation of the generator was reduced through charging and discharging of the battery, and economic efficiency and reliability were confirmed by reducing the fuel consumption of 1% of LNG.

A Survey on Students' Perception of Communication Skills in Class of Theories of Korean Medical Famous Physicians (각가의론 수업에서 학습한 의사소통기술에 대한 학생 인식 조사)

  • Jo, Hak-Jun;Jo, Na-Young;Park, Jeong-Su
    • Journal of Society of Preventive Korean Medicine
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    • v.25 no.2
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    • pp.13-31
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    • 2021
  • Objectives : The objectives of this study are to provide the education of communication skills in the class of theories of Korean medical famous physicians and to survey students' perception of the effect. Methods : The class of theories of Korean medical famous physicians was newly designed and was given to students. The results from the questionnaire survey with second year students at department of Korean medicine were applied to the evaluation of study issues. The scale used for this study was the modified version of 'Beyer-Fetzer's Essential Elements of Communication Skills Assessment Sheet', which was developed by researchers in line with the education of Korean medicine. Results : In six (except for 'opening a conversation') out of seven categories, post-test results were more improved than pretest results. In the category of communication skills (a total of 25 questions), post-test results were higher than pretest results in all items. Among them, 13 items were statistically significant. With regard to the question as to how important the class of communication skills is to raise their professionalism as Korean medicine doctor, post-test result was higher than pretest result. Regarding an appropriate education point of time, there were various points in the entire period of curriculum. The appropriateness of teaching-learning method was positively evaluated. In terms of the content helpful for learning, learner-oriented activities was preferred over teacher-oriented lecturing. Conclusions : The communication skills learned in the class of theories of Korean medical famous physicians were effective. Communications skills should be taught constantly in the entire curriculum in order to raise students' professionalism as Korean medicine doctor. In terms of education method, it is desirable to design a class based on students' various activities, rather than lecturing.

An analysis of the production conditions for small-sized women's jacket products - Focusing on young contemporary brands for spring/summer 2021 - (여성복 스몰사이즈 재킷 제품 생산실태- 2021년 S/S 영컨템포러리 브랜드를 중심으로 -)

  • Lee, Yujin;Jang, Jeongah
    • The Research Journal of the Costume Culture
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    • v.29 no.6
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    • pp.849-864
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    • 2021
  • This study analyzed product conditions in terms of "size system," "clothing construction depending on fit," "details," "colors," and "prices," with an emphasis on young contemporary brands for spring/summer 2021, in order to provide basic data for the development of small-sized women's jackets. Out of 96 domestic and foreign brands, the study analyzed 254 small-sized jacket products from 23 brands that produce size-XS jackets. First, when examining the sizes for women's jackets, we found that 8 out of the 23 brands offer a size-XXS option. After conducting tree analysis to analyze the factors affecting the production of size-XXS, the study found significant results in the areas of "distinction between domestic and foreign brands" and "product price." Second, after categorizing small-sized women's jackets into 3 categories-fit-slim, basic, and straight-the study analyzed clothing construction elements depending on fit. This seasons mainly feature straight-fit's hip-line length jacket, a 4-panel pattern, and a panel without a waist dart. Third, the study, through the analysis of the colors of small-sized women's jackets, found a higher frequency of colors in the order of black (23.0%), white (13.3%), and beige tones (10.1%), with additional colors such as sky blue, rose pink, and aquamarine in production, which exhibit the senses of the seasons. Price analysis revealed that small-sized jackets constituted a price range at the mid-to-low end, as in ₩50,000-100,000 (30.3%), ₩100,000-150,000 (19.3%), and ₩150,000-200,000 (11.8%).

A study on the effect of cable improvement renovating an old aircraft (노후 항공기 개조 시 케이블 개량에 따른 효과 연구)

  • Lee, Gwang-suk;Yoon, In-bok;Jang, In-dong
    • Journal of IKEEE
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    • v.26 no.2
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    • pp.257-264
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    • 2022
  • As it takes a lot of time and money to develop an aircraft, an environment for renovating and using existing operating aircraft has been created. As a result, many old aircraft were renovated, and due to the aging of the aircraft, more demanding cable requirements were required for renovation projects, and as the number of equipment inside the aircraft gradually increased, the difficulty of system integration increased. In order to solve the difficulties of system integration through systematization of verification procedures, this paper explains VSWR, I-loss, which are the main indicators of antenna cable modification, and explains DTF, one of the problem detection methods. It also explains the elements required for cable design, the environment to be measured, and procedures, and introduces the overall process and effect of antenna cable improvement through demonstration cases.

A Study on the Recognition and Development of Skin Care Subjects Using VR (VR 활용 피부미용 교과목 인식과 개발에 관한 연구)

  • Lee, Jung-Hee
    • Journal of the Korean Applied Science and Technology
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    • v.38 no.6
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    • pp.1485-1492
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    • 2021
  • In this study, in order to secure an educational environment for the development of skin beauty subjects using VR based on the learners' awareness of VR, a total of 105 learners' perception of VR, VR experience elements, and the development of VR-using skin beauty subjects, questions about general characteristics were conducted using an online questionnaire. As a result of the survey through frequency analysis, factor analysis, and correlation analysis, the higher the awareness of VR, the higher the educational performance and immersion (p<.01). It was found that awareness and interest were high (p<.001). As for the correlation, the higher the VR-using skin care experience factor, the higher the perception of VR-using skin beauty course development. Therefore, it was confirmed that it is necessary to develop and educate skin beauty subjects using VR in line with learners' expectations and the 4th industrial revolution era. Therefore, in follow-up studies, it is considered that it is necessary to develop and operate VR-based skin beauty subjects.

Exploring the Formal Language of Contemporary Meticulous Figure Painting

  • Wan Guo Long
    • International Journal of Advanced Culture Technology
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    • v.11 no.1
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    • pp.212-220
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    • 2023
  • The meticulous figure painting is one of the wonders of traditional Chinese painting and has blossomed in art history with its unique and interesting style. The period from the Warring States period to the Song and Yuan dynasties was a glorious period in its history, after which it tended to decline due to changes in painting materials and many socio-historical reasons. The extensive cultural exchanges in the world today, the penetration of Western values and the expansion of information technology have brought a huge impact on Chinese meticulous figure painting, which has developed an active way of thinking and expression after absorbing certain elements of Western culture and thought on the basis of inherited tradition. Contemporary Realistic Figure painters continue to explore new developments in meticulous figure painting in the contemporary context, and give contemporary meticulous figure painting a new cultural and ideological connotation, forming a new look that meets the requirements of the times, with richer and more lively content, subject matter and formal language. Traditional meticulous figure painting is characterised by a highly refined use of line and coloring composition. Contemporary meticulous figure painting focuses on the use of purely formal language and the expression of the personality of the creative subject, with a new outlook on the world of painting. In the contemporary multicultural context, new formal language and methods of expression are constantly being explored to create a new look. In the process of development, contemporary meticulous figure painting has merged the best qualities of traditional and contemporary culture, making it an art with a subtle language, rich in meaning and with the charm of the times and oriental characteristics. The author in the form of contemporary fine brushwork figure painting language as the research object, explore new form of fine brushwork figure painting, and in the contemporary society and multicultural context factors. Innovation, enrich and develop new forms of art language of contemporary social form and aesthetic temperament and interest.

A Case Study on Quality Improvement of Electric Vehicle Hairpin Winding Motor Using Deep Learning AI Solution (딥러닝 AI 솔루션을 활용한 전기자동차 헤어핀 권선 모터의 용접 품질향상에 관한 사례연구)

  • Lee, Seungzoon;Sim, Jinsup;Choi, Jeongil
    • Journal of Korean Society for Quality Management
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    • v.51 no.2
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    • pp.283-296
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    • 2023
  • Purpose: The purpose of this study is to actually implement and verify whether welding defects can be detected in real time by utilizing deep learning AI solutions in the welding process of electric vehicle hairpin winding motors. Methods: AI's function and technological elements using synthetic neural network were applied to existing electric vehicle hairpin winding motor laser welding process by making special hardware for detecting electric vehicle hairpin motor laser welding defect. Results: As a result of the test applied to the welding process of the electric vehicle hairpin winding motor, it was confirmed that defects in the welding part were detected in real time. The accuracy of detection of welds was achieved at 0.99 based on mAP@95, and the accuracy of detection of defective parts was 1.18 based on FB-Score 1.5, which fell short of the target, so it will be supplemented by introducing additional lighting and camera settings and enhancement techniques in the future. Conclusion: This study is significant in that it improves the welding quality of hairpin winding motors of electric vehicles by applying domestic artificial intelligence solutions to laser welding operations of hairpin winding motors of electric vehicles. Defects of a manufacturing line can be corrected immediately through automatic welding inspection after laser welding of an electric vehicle hairpin winding motor, thus reducing waste throughput caused by welding failure in the final stage, reducing input costs and increasing product production.

A Study on Transferred Load Reduction on Paved Track Roadbed with Low Elastic Base Plate Pad (저탄성 베이스플레이트 패드 적용에 따른 포장궤도 노반에서의 전달하중 저감에 관한 연구)

  • Lee, Il-Wha;Kang, Yun-Suk;Lee, Hee-Up
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.28 no.3D
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    • pp.399-405
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    • 2008
  • Development of the paved track is required as a low-maintenance of conventional line. The paved tracks are one of the types of the ballast reinforced tracks those are manufactured by adopting the prepacked concrete technique. The main elements of this tracks are large sleeper, low elastic pad, fastener, cement mortar, geotextile and recycled ballast. Low elastic pad is the most effective element of such tracks on the basis of stress-displacement characteristics, dynamic response and fatigue characteristics. The stiffness of the pad determine the stiffness of the track. Consequently, it is more important in case of concrete track structure such as paved track because application of low elastic pad seriously effect the durability and stability of the track. The main objective of this study is to confirm the reduction of train load, which transfer to roadbed through various pad effects. To achieve this task static, numerical analysis and real scale repeated loading test was performed while load reduction effect of low elastic pad was analyzed by using displacement, stress and strain ratio characteristics of the paved track.