Pub Date : 2024-01-31DOI: 10.5762/kais.2024.25.1.419
Eai-Sook Ra, Yeon-Soo Shin
Recently, the factors of housing satisfaction in apartments have been recognized as important for improving the service of the management entity. This study identifies the factors affecting the housing satisfaction of tenants and determines priorities using the AHP technique to aid the efficient operation of apartment management services, secure competitiveness, and provide differentiated services. As a model for AHP analysis, 46 pairwise comparison questions for upper (4) and lower criteria (5 each) items were constructed for hierarchical identification
{"title":"An Analysis of Important Factors in Apartment Housing Satisfaction Using AHP","authors":"Eai-Sook Ra, Yeon-Soo Shin","doi":"10.5762/kais.2024.25.1.419","DOIUrl":"https://doi.org/10.5762/kais.2024.25.1.419","url":null,"abstract":"Recently, the factors of housing satisfaction in apartments have been recognized as important for improving the service of the management entity. This study identifies the factors affecting the housing satisfaction of tenants and determines priorities using the AHP technique to aid the efficient operation of apartment management services, secure competitiveness, and provide differentiated services. As a model for AHP analysis, 46 pairwise comparison questions for upper (4) and lower criteria (5 each) items were constructed for hierarchical identification","PeriodicalId":112431,"journal":{"name":"Journal of the Korea Academia-Industrial cooperation Society","volume":"416 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140472977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.5762/kais.2024.25.1.686
Suk-Tae Kim
Meticulous estimation of resource allocation is essential in the design phase to establish a rational and optimized architectural space. Abstract preliminary tasks of this nature face limitations with simple calculation methods due to the complexity and variability associated with user flow. In this study, a resource allocation simulation analysis method based on system dynamics is proposed. Using a large-scale health examination center as an example, examination rooms are defined as stocks
{"title":"Proposal of Occupant Dynamics for Validating the Feasibility of Resource Allocation in the Space Programming Process","authors":"Suk-Tae Kim","doi":"10.5762/kais.2024.25.1.686","DOIUrl":"https://doi.org/10.5762/kais.2024.25.1.686","url":null,"abstract":"Meticulous estimation of resource allocation is essential in the design phase to establish a rational and optimized architectural space. Abstract preliminary tasks of this nature face limitations with simple calculation methods due to the complexity and variability associated with user flow. In this study, a resource allocation simulation analysis method based on system dynamics is proposed. Using a large-scale health examination center as an example, examination rooms are defined as stocks","PeriodicalId":112431,"journal":{"name":"Journal of the Korea Academia-Industrial cooperation Society","volume":"364 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140471040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.5762/kais.2024.25.1.767
J. Park, Dae-Yong Um
Recently, the need and demand for forest roads has increased as forestry mechanization is promoted and the function for public purposes, such as public safety, health, and recreation, is increasing. In this study, data from a forest road construction site were acquired using drone LiDAR (Light Detection And Ranging). The data were generated, compared, and analyzed before and during construction. Using the drone LiDAR data, a DEM (Digital Elevation Model) with the trees removed was produced
{"title":"Utilization of Drone LiDAR for Route Planning of Forest Road and Construction Inspection","authors":"J. Park, Dae-Yong Um","doi":"10.5762/kais.2024.25.1.767","DOIUrl":"https://doi.org/10.5762/kais.2024.25.1.767","url":null,"abstract":"Recently, the need and demand for forest roads has increased as forestry mechanization is promoted and the function for public purposes, such as public safety, health, and recreation, is increasing. In this study, data from a forest road construction site were acquired using drone LiDAR (Light Detection And Ranging). The data were generated, compared, and analyzed before and during construction. Using the drone LiDAR data, a DEM (Digital Elevation Model) with the trees removed was produced","PeriodicalId":112431,"journal":{"name":"Journal of the Korea Academia-Industrial cooperation Society","volume":"74 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140476901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.5762/kais.2024.25.1.79
Jaehong Park
{"title":"Analysis of Technical Efficiency of Sericulture Farmers Using Stochastic Frontier Analysis","authors":"Jaehong Park","doi":"10.5762/kais.2024.25.1.79","DOIUrl":"https://doi.org/10.5762/kais.2024.25.1.79","url":null,"abstract":"","PeriodicalId":112431,"journal":{"name":"Journal of the Korea Academia-Industrial cooperation Society","volume":"146 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140471354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.5762/kais.2024.25.1.611
Won-Beom Kim
Large steel structures are exposed to several types of loads depending on the configuration of the structure or member. In many cases, the axial force primarily affects the strength of structures. On the other hand, the life of a structure can be affected depending on the type of load, for example, shear force or mixed loads. This study examined the Mode II state of the loading condition under fatigues and fractures. Mode I fatigues and fractures have been extensively studied in evaluating the stress intensity factor (SIF), but Mode II failure has seldom been studied. In addition, many types of specimens have been used because a standardized specimen or experimental procedure has not yet been established for Mode II conditions. Therefore, the behavior of the SIF of the Mode II condition was examined using the finite element method (FEM) and J integral with an in-house FEM program. The evaluation used 3905 nodes and 7596 elements of a full model specimen with a crack length of 0.04 m. The results were compared with other results, and an accuracy of more than 97.4 % was achieved with the proposed calculation.
根据结构或构件的构造，大型钢结构会承受多种类型的荷载。在许多情况下，轴向力主要影响结构的强度。另一方面，结构的寿命也会受到荷载类型的影响，例如剪力或混合荷载。本研究考察了疲劳和断裂情况下加载条件的模式 II 状态。在评估应力强度因子（SIF）时，已对模式 I 疲劳和断裂进行了广泛研究，但很少对模式 II 失效进行研究。此外，由于尚未针对模式 II 条件建立标准化的试样或实验程序，因此使用了多种类型的试样。因此，我们使用有限元法（FEM）和内部 FEM 程序的 J 积分对模式 II 条件下的 SIF 行为进行了研究。评估使用了全模型试样的 3905 个节点和 7596 个元素，裂缝长度为 0.04 米。评估结果与其他结果进行了比较，建议的计算精度超过 97.4%。
{"title":"Evaluation of Stress Intensity Factor at Mode II condition by J integral","authors":"Won-Beom Kim","doi":"10.5762/kais.2024.25.1.611","DOIUrl":"https://doi.org/10.5762/kais.2024.25.1.611","url":null,"abstract":"Large steel structures are exposed to several types of loads depending on the configuration of the structure or member. In many cases, the axial force primarily affects the strength of structures. On the other hand, the life of a structure can be affected depending on the type of load, for example, shear force or mixed loads. This study examined the Mode II state of the loading condition under fatigues and fractures. Mode I fatigues and fractures have been extensively studied in evaluating the stress intensity factor (SIF), but Mode II failure has seldom been studied. In addition, many types of specimens have been used because a standardized specimen or experimental procedure has not yet been established for Mode II conditions. Therefore, the behavior of the SIF of the Mode II condition was examined using the finite element method (FEM) and J integral with an in-house FEM program. The evaluation used 3905 nodes and 7596 elements of a full model specimen with a crack length of 0.04 m. The results were compared with other results, and an accuracy of more than 97.4 % was achieved with the proposed calculation.","PeriodicalId":112431,"journal":{"name":"Journal of the Korea Academia-Industrial cooperation Society","volume":"427 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140472942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.5762/kais.2024.25.1.780
Y. Hwang, Chang-Ho Yun, Yong-Hyun Kim, Hak-Jin Kim
For the practical implementation of autonomous agricultural machinery, reliable obstacle recognition and collision prevention systems are essential in agricultural environments. This study aimed to develop a collision prevention system for autonomous tractors capable of real-time obstacle recognition and responsive collision avoidance using video sensor fusion technology. Emphasizing human safety as the top priority, the system targeted obstacle recognition specifically for humans and operated within designed risk and warning zone ranges aligned with the tractor's direction. The developed sensor fusion system integrated the robust object classification capabilities of an RGB camera with a lidar sensor for precise distance measurement, achieving synchronization through camera-lidar calibration. The recognition algorithm, based on the YOLO model applied to RGB images, identified humans, while the lidar data projected onto the image measured the relative distance from the tractor. The collision prevention system, relying on the relative distance of recognized obstacles, halted the tractor in hazardous areas, resuming operation once the obstacle cleared. Validation in static and dynamic situations on flat farmland demonstrated a recognition rate exceeding 99% in collision risk zones, a 24 cm RMSE for distance measurement, and a success rate of over 98% in collision prevention and response.
{"title":"Development of Sensor Fusion-based Obstacle Detection and Collision Avoidance Technology for Autonomous Tractor","authors":"Y. Hwang, Chang-Ho Yun, Yong-Hyun Kim, Hak-Jin Kim","doi":"10.5762/kais.2024.25.1.780","DOIUrl":"https://doi.org/10.5762/kais.2024.25.1.780","url":null,"abstract":"For the practical implementation of autonomous agricultural machinery, reliable obstacle recognition and collision prevention systems are essential in agricultural environments. This study aimed to develop a collision prevention system for autonomous tractors capable of real-time obstacle recognition and responsive collision avoidance using video sensor fusion technology. Emphasizing human safety as the top priority, the system targeted obstacle recognition specifically for humans and operated within designed risk and warning zone ranges aligned with the tractor's direction. The developed sensor fusion system integrated the robust object classification capabilities of an RGB camera with a lidar sensor for precise distance measurement, achieving synchronization through camera-lidar calibration. The recognition algorithm, based on the YOLO model applied to RGB images, identified humans, while the lidar data projected onto the image measured the relative distance from the tractor. The collision prevention system, relying on the relative distance of recognized obstacles, halted the tractor in hazardous areas, resuming operation once the obstacle cleared. Validation in static and dynamic situations on flat farmland demonstrated a recognition rate exceeding 99% in collision risk zones, a 24 cm RMSE for distance measurement, and a success rate of over 98% in collision prevention and response.","PeriodicalId":112431,"journal":{"name":"Journal of the Korea Academia-Industrial cooperation Society","volume":"494 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140472492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.5762/kais.2024.25.1.132
Ji-Hwan Shin
An increase in speed of train operation has been planned to prepare for the end of the KTX service life in accordance with the "400-km/h Master Plan." The development of high-speed railway vehicles exceeding 350 km/h is necessary, and it is important to analyze vibration characteristics, which have a significant impact on passenger safety and riding comfort. Also, it is essential to set a direction for improvement. A prediction study was carried out for the vibration characteristics that may occur in electric multiple unit (EMU) high-speed trains at running speeds exceeding 350 km/h. To this end, EMU high-speed trains consisting of two coaches and six locomotives were modeled using SIMPACK software. Measured data during a test run were used to verify this model. Using the verified analysis model, vibration characteristics were predicted and analyzed for each speed from 200 km/h to 400 km/h. Vibration increased linearly with speed, but even at a speed of 400 km/h, the vibration characteristics were much lower than the limit values specified in the EN 14363 standard. In addition, it was confirmed that riding comfort could be achieved using the mean comfort method of EN 12299.
根据 "时速 400 公里总体规划"，已计划提高列车运行速度，为 KTX 使用寿命的结束做准备。开发时速超过 350 公里的高速铁路车辆是必要的，重要的是分析对乘客安全和乘坐舒适性有重大影响的振动特性。此外，还必须确定改进方向。我们对时速超过 350 公里的电动多联式（EMU）高速列车可能出现的振动特性进行了预测研究。为此，使用 SIMPACK 软件对由两辆客车和六个机车组成的 EMU 高速列车进行了建模。试运行期间的测量数据用于验证该模型。利用经过验证的分析模型，预测并分析了从 200 公里/小时到 400 公里/小时的各种速度下的振动特性。振动随速度线性增加，但即使在 400 km/h 的速度下，振动特性也远低于 EN 14363 标准规定的极限值。此外，使用 EN 12299 标准的平均舒适度方法证实，可以实现乘坐舒适性。
{"title":"A Study on the Prediction of Vibration Characteristics of EMU High-Speed Trains by Speed","authors":"Ji-Hwan Shin","doi":"10.5762/kais.2024.25.1.132","DOIUrl":"https://doi.org/10.5762/kais.2024.25.1.132","url":null,"abstract":"An increase in speed of train operation has been planned to prepare for the end of the KTX service life in accordance with the \"400-km/h Master Plan.\" The development of high-speed railway vehicles exceeding 350 km/h is necessary, and it is important to analyze vibration characteristics, which have a significant impact on passenger safety and riding comfort. Also, it is essential to set a direction for improvement. A prediction study was carried out for the vibration characteristics that may occur in electric multiple unit (EMU) high-speed trains at running speeds exceeding 350 km/h. To this end, EMU high-speed trains consisting of two coaches and six locomotives were modeled using SIMPACK software. Measured data during a test run were used to verify this model. Using the verified analysis model, vibration characteristics were predicted and analyzed for each speed from 200 km/h to 400 km/h. Vibration increased linearly with speed, but even at a speed of 400 km/h, the vibration characteristics were much lower than the limit values specified in the EN 14363 standard. In addition, it was confirmed that riding comfort could be achieved using the mean comfort method of EN 12299.","PeriodicalId":112431,"journal":{"name":"Journal of the Korea Academia-Industrial cooperation Society","volume":"10 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140474857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.5762/kais.2024.25.1.70
So-Hee Lee, Jong-Suh Shin, S. Cho, G. Son, Eui-Kyung Lee, Nam-Oh Kim, Byoung-Ki Park
This study was conducted to determine the effects of dam parity on the growth performance, carcass characteristics, and economic efficacy of Hanwoo steers. 344 Hanwoo calves were divided into five groups based on dam parity (1-2, 3-4, 5, 6
{"title":"Effects of dam’s parity on growth performance, carcass characteristics and economic efficacy of Hanwoo steers","authors":"So-Hee Lee, Jong-Suh Shin, S. Cho, G. Son, Eui-Kyung Lee, Nam-Oh Kim, Byoung-Ki Park","doi":"10.5762/kais.2024.25.1.70","DOIUrl":"https://doi.org/10.5762/kais.2024.25.1.70","url":null,"abstract":"This study was conducted to determine the effects of dam parity on the growth performance, carcass characteristics, and economic efficacy of Hanwoo steers. 344 Hanwoo calves were divided into five groups based on dam parity (1-2, 3-4, 5, 6","PeriodicalId":112431,"journal":{"name":"Journal of the Korea Academia-Industrial cooperation Society","volume":"736 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140474775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.5762/kais.2024.25.1.714
Dong-Wg Hong, Ju-Hyun Kim
Ballistic missiles have an elliptical ballistic trajectory and fall at high speed, so the defence system was able to predict the point of impact. In the paper, the trajectory of a low-altitude glide maneuver type ballistic missile was simulated by adjusting the flight path angle using the pitch turn rate for each flight stage and entering the desired glide altitude during fall. As a result of the analysis, the flight time was longer as the peak altitude was lower and shorter as the peak altitude was higher, which was judged to be because the higher the altitude, the higher the average speed. In addition, the root mean squre error for the impact point of the simulated trajectory and the prediction result of the impact point was obtained. As a result of the prediction, the rmse is more than tens of km, and it was found that it is difficult to predict the point of impact when the missile is in the glide section. The results of this study are expected to be used for threat assessment of ballistic missiles of various trajectories, and for judging and selecting the possibility of engagement of response systems in the future.
{"title":"Flight Trajectory simulation of Low Altitude Glide Maneuvering Missile using pitchturn rate and Impact Point estimation analytics","authors":"Dong-Wg Hong, Ju-Hyun Kim","doi":"10.5762/kais.2024.25.1.714","DOIUrl":"https://doi.org/10.5762/kais.2024.25.1.714","url":null,"abstract":"Ballistic missiles have an elliptical ballistic trajectory and fall at high speed, so the defence system was able to predict the point of impact. In the paper, the trajectory of a low-altitude glide maneuver type ballistic missile was simulated by adjusting the flight path angle using the pitch turn rate for each flight stage and entering the desired glide altitude during fall. As a result of the analysis, the flight time was longer as the peak altitude was lower and shorter as the peak altitude was higher, which was judged to be because the higher the altitude, the higher the average speed. In addition, the root mean squre error for the impact point of the simulated trajectory and the prediction result of the impact point was obtained. As a result of the prediction, the rmse is more than tens of km, and it was found that it is difficult to predict the point of impact when the missile is in the glide section. The results of this study are expected to be used for threat assessment of ballistic missiles of various trajectories, and for judging and selecting the possibility of engagement of response systems in the future.","PeriodicalId":112431,"journal":{"name":"Journal of the Korea Academia-Industrial cooperation Society","volume":"61 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140476594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.5762/kais.2024.25.1.450
Kyongok Park, Sun-young Lee
{"title":"The education for Long-Term Care Workers required to use Care Robots: Focusing on Japan Case Review","authors":"Kyongok Park, Sun-young Lee","doi":"10.5762/kais.2024.25.1.450","DOIUrl":"https://doi.org/10.5762/kais.2024.25.1.450","url":null,"abstract":"","PeriodicalId":112431,"journal":{"name":"Journal of the Korea Academia-Industrial cooperation Society","volume":"56 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140477696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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