• Title/Summary/Keyword: Virtual methods

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Point Cloud-Based Spatial Environment Development for Near Real-Time Erection Simulation in Shipyards

  • Yeon-Jun Kim;SeungYeol Wang;Jaewon Jang;Bon-Yeong Park;Dong-Kun Lee;Daekyun Oh
    • Journal of Ocean Engineering and Technology
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    • v.37 no.6
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    • pp.247-255
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    • 2023
  • Interference and collisions often occur in the loading process at shipyards. Existing simulation methods focus primarily on resource processes and schedules, and there is a lack of real-time reflection in the complex and highly variable loading process. This study aims to develop a spatial environment incorporating real-time product data, such as hulls, and confirms its effectiveness by simulating various construction scenarios. As a method, a near real-time spatial environment based on broadband laser scanning was established, with the situation of loading heavy cargo assumed when converting an existing ship into an LNG dual-fuel propulsion ship. A case study simulation of near-real-time cargo loading processes was then conducted using Unity 3D to confirm the interference and collision risks within the spatial environment. The results indicated that interference occurred in structures previously not identified in the design data, and a collision occurred during the loading object erection phase. The simulation confirmed that the identification of interference and collision risks during the erection phase highlights the need for a relocation or removal process of potential hazards before erection takes place. An improved erection simulation that integrates near real-time data could effectively prevent interference and collision risks.

Prediction of Draft Force of Moldboard Plow according to Travel Speed in Cohesive Soil using Discrete Element Method (이산요소법을 활용한 점성토 환경에서의 작업 속도에 따른 몰드보드 플라우 견인력 예측)

  • Bo Min Bae;Dae Wi Jung;Dong Hyung Ryu;Jang Hyeon An;Se O Choi;Yeon Soo Kim;Yong Joo Kim
    • Journal of Drive and Control
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    • v.20 no.4
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    • pp.71-79
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    • 2023
  • In the field of agricultural machinery, various on-field tests are conducted to measure design load for optimal design of agricultural equipment. However, field test procedures are costly and time-consuming, and there are many constraints on field soil conditions due to weather, so research on utilizing simulation to overcome these shortcomings is needed. Therefore, this study aimed to model agricultural soils using discrete element method (DEM) software. To simulate draft force, predictions are made according to travel speed and compared to field test results to validate the prediction accuracy. The measured soil properties are used for DEM modeling. In this study, the soil property measurement procedure was designed to measure the physical and mechanical properties. DEM soil model calibration was performed using a virtual vane shear test instead of the repose angle test. The DEM simulation results showed that the prediction accuracy of the draft force was within 4.8% (2.16~6.71%) when compared to the draft force measured by the field test. In addition, it was confirmed that the result was up to 72.51% more accurate than those obtained through theoretical methods for predicting draft force. This study provides useful information for the DEM soil modeling process that considers the working speed from the perspective of agricultural machinery research and it is expected to be utilized in agricultural machinery design research.

Development of an Artificial Intelligence-based Marine Ecological Transformation Education Program to Improve the Ecological Sensitivity of Elementary School Students (초등학생의 생태적 감수성 향상을 위한 인공지능 기반 해양 생태전환교육 프로그램 개발)

  • Kim, Min-Sun;Shin, Dong-Hoon
    • Journal of Korean Elementary Science Education
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    • v.43 no.1
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    • pp.148-157
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    • 2024
  • The purpose of this study was to develop an artificial intelligence-based marine ecological education program to improve the ecological sensitivity of elementary school students. The program was taught 11 times within 4 weeks, and an ecological sensitivity test was conducted before and after the program. The statistical results of the tests showed that the developed program improved the ecological sensitivity of elementary school students. Through in-depth interviews, improvements were found in all the areas, such as empathy for the living things, interest in nature, enjoyment of nature, and wonder about nature. Through the marine ecological classes, which used artificial intelligence and virtual reality, the students were able to get closer to nature, and the student participation activities showed a positive effect on their ecological sensitivity. This indicates that experience-oriented education methods are more effective than simple explanatory classes to improve the students' ecological sensitivity, and artificial intelligence technology proved effective in increasing the students' immersion in the class.

A Study on Enhancement of 3D Sound Using Improved HRTFS (개선된 머리전달함수를 이용한 3차원 입체음향 성능 개선 연구)

  • Koo, Kyo-Sik;Cha, Hyung-Tai
    • The Journal of the Acoustical Society of Korea
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    • v.28 no.6
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    • pp.557-565
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    • 2009
  • To perceive the direction and the distance of a sound, we always use a couple of information. Head Related Transfer Function (HRTF) contains the information that sound arrives from a sound source to the ears of the listener, like differences of level, phase and frequency spectrum. For a reproduction system using 2 channels, we apply HRTF to many algorithms which make 3d sound. But it causes a problem to localize a sound source around a certain places which is called the cone-of-confusion. In this paper, we proposed the new algorithm to reduce the confusion of sound image localization. The difference of frequency spectrum and psychoacoustics theory are used to boost the spectral cue among each directions. To confirm the performance of the algorithm, informal listening tests are carried out. As a result, we can make the improved 3d sound in 2 channel system based on a headphone. Also sound quality of improved 3d sound is much better than conventional methods.

MPEG Surround for Multi-Channel Audio Coding-Part 2: Various Modes and Tools (다채널 오디오 코딩을 위한 MPEG Surround-2부: 다양한 모드 및 툴들)

  • Pang, Hee-Suk
    • The Journal of the Acoustical Society of Korea
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    • v.28 no.7
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    • pp.610-617
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    • 2009
  • An overview of various modes and tools of MPEG Surround is provided Because the binaural mode of MPEG Surround supports the virtual 5.1-channel playback based on HRTFs, it can be played via headphones and earphones for portable audio devices. MPEG Surround also supports the enhanced matrix mode which converts stereo signals to 5.1-channel signals without side information, the 3D stereo mode which deals with 3D-coded signals, the low power version which greatly reduces the computational load in the decoding process. Besides, MPEG Surround provides the arbitrary downmix gains (ADGs) tool which is applied to artistic downmix signals, the matrix compatibility tool which is applied to downmix signals by conventional matrix-based methods, the residual coding tool -which can be used at high bit rates, and the GES tool which is applied to specific sound such as applause. The listening test results by various companies and organizations are also presented for important modes and tools.

Analysis of research trends in the healthcare field utilizing extended-reality-based converged contents (확장현실 기반 융복합 콘텐츠를 활용한 보건의료 분야의 연구 동향 분석)

  • Ji-Eun Im;Ju-Hee Lee;Soon-Ryun Lim;Won-Jae Lee
    • Journal of Korean society of Dental Hygiene
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    • v.24 no.3
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    • pp.197-208
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    • 2024
  • Objectives: Extended reality technology offers an innovative opportunity to enhance self-directed learning through interactive processes in healthcare education. This study aims to analyze research trends in the application of extended reality technology-based educational content in the field of healthcare. Methods: Through literature search, selection, and exclusion processes based on predefined criteria, we conducted an analysis of domestic healthcare studies employing extended reality technology, ultimately selecting and examining 39 relevant publications. Results: The analysis reveals diverse applications of extended reality across various fields such as medicine, dentistry, and nursing. Positive effects, including increased academic satisfaction, immersion, and interest, are observed, alongside challenges like media usage difficulties and cybersickness. Conclusions: Future research should focus on the development and application of extended reality-based educational content in diverse healthcare curricula, emphasizing both educational approaches and continuous technological advancements.

Development of Fashion Design Applying Hippie Characteristics Based on 3D Digital Fashion Design (히피 특성을 활용한 3D 디지털 패션 디자인)

  • Dayeon You;Yoon Mee Lee;Younhee Lee
    • Journal of the Korea Fashion and Costume Design Association
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    • v.25 no.4
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    • pp.13-28
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    • 2023
  • The purpose of this study is to analyze the characteristics of hippie style in emerging brands pursuing the hippie spirit, examine the changes in hippie style, and apply them to the design development process to propose a hippie style design that reflects contemporary characteristics. The research method of this study was used to grasp the characteristics and current status of hippie style based on a literature review and prior research. Through the analysis of Bode and Story mfg, a new brand that reflects the hippie spirit, the design expression methods and characteristics of modern hippie style were derived, and based on the analysis, the design of the 3D CLO virtual outfit was developed. The results of the study are as follows. First, in addition to the use of eco-friendly materials, the digital technology of the CLO 3D program was applied to the design development process, which made it possible to increase sustainability from the production process. Second, by creating a retro design centered on a striped pattern expressing freedom, revolution, and equality, and a handcrafted design based on a tie-dye pattern, the design was able to express the hippie spirit of loving nature, and through this, a new direction of eco-friendly and modern fashion design was presented.

Ablative Outcomes of Various Energy Modes for No-Touch and Peripheral Tumor-Puncturing Radiofrequency Ablation: An Ex Vivo Simulation Study

  • Dong Ik Cha;Min Woo Lee;Kyoung Doo Song;Seong Eun Ko;Hyunchul Rhim
    • Korean Journal of Radiology
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    • v.23 no.2
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    • pp.189-201
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    • 2022
  • Objective: To compare the outcomes of radiofrequency ablation (RFA) using dual switching monopolar (DSM), switching bipolar (SB), and combined DSM + SB modes at two different interelectrode distances (25 and 20 mm) in an ex vivo study, which simulated ablation of a 2.5-cm virtual hepatic tumor. Materials and Methods: A total of 132 ablation zones were created (22 ablation zones for each protocol) using three separable clustered electrodes. The performances of the DSM, SB, and combined DSM + SB ablation modes were compared by evaluating the following parameters of the RFA zones at two interelectrode distances: shape (circularity), size (diameter and volume), peritumoral ablative margins, and percentages of the white zone at the midpoint of the two electrodes (ablative margin at midpoint, AMm) and in the electrode path (ablative margin at electrode path, AMe). Results: At both distances, circularity was the highest in the SB mode, followed by the DSM + SB mode, and was the lowest in the DSM mode. The circularity of the ablation zone showed a significant difference among the three energy groups (p < 0.001 and p = 0.002 for 25-mm and 20-mm, respectively). All size measurements, AMm, and AMe were the greatest in the DSM mode, followed by the DSM + SB mode, and the lowest were with the SB mode (all statistically significant). The white zone proportion in AMm and AMe were the greatest in the SB mode, followed by the DSM + SB mode and DSM in general. Conclusion: DSM and SB appear to be complementary in creating an ideal ablation zone. RFA with the SB mode can efficiently eradicate tumors and create a circular ablation zone, while DSM is required to create a sufficient ablative margin and a large ablation zone.

A Study on User Satisfaction Evaluation of Acceleration-Based Automated Driving Patterns (가속도 기반 자율주행 패턴에 대한 이용자 만족도 평가 연구)

  • Sooncheon Hwang;Dongmin Lee
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.22 no.6
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    • pp.284-298
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    • 2023
  • With the rapid advances in automated driving technology, opportunities to experience automated driving directly or indirectly are being provided to the public. On the other hand, research on the preferred automated driving patterns from the user's perspective has not been conducted in Korea. This study used a driving simulator and an experimental vehicle capable of automated driving to evaluate the user satisfaction regarding longitudinal and lateral accelerations. Automated driving patterns were implemented in a virtual environment simulation using five values of longitudinal and lateral accelerations derived from driving experiments. Among these values, three were implemented through experimental vehicle-based automated driving to evaluate satisfaction and anxiety. The participants evaluated lateral acceleration more sensitively than longitudinal acceleration and showed higher levels of anxiety. Based on these results, the necessity of user-oriented evaluation research for automated driving patterns and the suitability of simulator-based evaluation methods were presented.

Case Study on AR Technology Use in the Fashion Industry: Focusing on Classification of Use Types (패션산업에서의 AR기술 활용 사례 연구: 활용 유형을 중심으로 )

  • Mi Young Son
    • Science of Emotion and Sensibility
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    • v.27 no.1
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    • pp.81-92
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    • 2024
  • This study analyzed augmented reality (AR) technology use in the fashion industry by classifying them based on product, wearer, space, purpose, and use. In this study, 76 cases of AR technology use in the fashion industry that were analyzed in domestic and foreign portals (Google, Naver, etc.) and research articles were collected and analyzed. The study found that in AR technology cases, the dimensions of the product, wearer, and space were utilized in various ways, including real, virtual, and their combination. AR technology was used diversely and creatively in design and product development, marketing and publicity, fashion shows, try-ons, online and offline sales and distribution, etc. Through AR technology, the categories of fashion products, concept of fashion shows, try-on methods, marketing and promotional tools, and sales tools are expanded more creatively from the existing framework. For inclusive growth within the fashion industry in the future, the national government, local governments, and large corporations should develop measures in bridging the digital gap, such as the use of AR technology according to technological readiness, capital, and age.