• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2005.10a
• /
• pp.851-856
• /
• 2005

The precision fabrication of aspherical lenses is increasingly required for the latest applications of compact and high resolution video-recording or camera systems. Micro-optical components, including micro-spherical or aspherical lenses and reflecting mirrors, are generally required to be manufactured with high shape accuracy, extremely low surface roughness and no surface damage. To meet the needs of the precision fabrication system, a bed which supports the micro aspherical lens fabrication machines stably and safely is required. In this study, the thickness of the ribs of the bed is optimized using the CAD integrated optimal design system, a virtual DS program.

• International Journal of Computer Science & Network Security
• /
• v.22 no.7
• /
• pp.427-442
• /
• 2022

MP3 is one of the most widely used file formats for encoding and representing audio data. One of the reasons for this popularity is their significant ability to reduce audio file sizes in comparison to other encoding techniques. Additionally, other reasons also include ease of implementation, its availability and good technical support. Steganography is the art of shielding the communication between two parties from the eyes of attackers. In steganography, a secret message in the form of a copyright mark, concealed communication, or serial number can be embedded in an innocuous file (e.g., computer code, video film, or audio recording), making it impossible for the wrong party to access the hidden message during the exchange of data. This paper describes a new steganography algorithm for encoding secret messages in MP3 audio files using an improved least significant bit (LSB) technique with high embedding capacity. Test results obtained shows that the efficiency of this technique is higher compared to other LSB techniques.

• Human Ecology Research
• /
• v.60 no.1
• /
• pp.69-86
• /
• 2022

The present study examined the effectiveness of repeated marriage checkups at intervals of six months in a Family Center in Seoul. To achieve this, the pilot study protocol (Park, 2019) was adapted, emphasizing strength-based, counseling-oriented approaches. Two couples and family therapists with master's degrees were trained and their practice was monitored to ensure program fidelity. The methods employed for the assessment of marriage checkup were an online survey, a video recording of couple problem-solving, and a clinical interview. A total of 14 couples participated in the 1st checkup, 10 of whom also completed the 2nd checkup. Couples with varying levels of marital satisfaction participated in the program. Descriptive statistics indicated gradual increases over 8-9 months in diverse indices such as marital satisfaction and relationship strength, while other indices fluctuated slightly but converged to higher levels over time. A non-parametric analysis appropriate for small samples demonstrated statistically significant increases over the 8-9 months in marital satisfaction among couples. The current study evidenced the effectiveness of repeated marriage checkups in the Family Center, which is the primary public institution for family policy and services in Korea. Repeated marriage checkups are therefore a promising way to enhance couples' relationship health and improve the family management system of the Family Center.

• International conference on construction engineering and project management
• /
• 2022.06a
• /
• pp.319-327
• /
• 2022

Robots for construction sites, although not deeply widespread, are finding applications in the duties of project monitoring, material movement, documentation, security, and simple repetitive construction-related tasks. A significant shortcoming in the use of robots is the complexity involved in programming and re-programming an automation routine. Robotic programming is not an expected skill set of the traditional construction industry professional. Therefore, this research seeks to deliver a low-cost approach toward re-programming that does not involve a programmer's skill set. The researchers in this study examined an approach toward programming a terrestrial-based drone so that it follows a taped path. By doing so, if an alternative path is required, programmers would not be needed to re-program any part of the automated routine. Changing the path of the drone simply requires removing the tape and placing a different path - ideally simplifying the process and quickly allowing practitioners to implement a new automated routine. Python programming scripts were used with a DJI Robomaster EP Core drone, and a terrain navigation assessment was conducted. The study examined the pass/fail rates for a series of trial run over different terrains. The analysis of this data along with video recording for each trial run allowed the researchers to conclude that the accuracy of the tape follow technique was predictable on each of the terrain surfaces. The accuracy and predictability inform a non-coding construction practitioner of the optimal placement of the taped path. This paper further presents limitations and suggestions for some possible extended research options for this study.

• International Journal of Internet, Broadcasting and Communication
• /
• v.16 no.1
• /
• pp.47-54
• /
• 2024

With the rapid development of 3D animation, MetaHuman is widely used in film production, game development and VR production as a virtual human creation platform.In the animation production of virtual humans, motion capture is usually used.Since different motion capture solutions use different skeletons for motion recording, when the skeleton level of recorded animation data is different from that of MetaHuman, the animation data recorded by motion capture cannot be directly used on MetaHuman. This requires Reorient the skeletons of both.This study explores an efficient skeleton reorientation method that can maintain the accuracy of animation data by reducing the number of bone chains.In the experiment, three skeleton structures, Rokoko, Mixamo and Xsens were used for efficient redirection experiments, to compare and analyze the adaptability of different skeleton structures to the MetaHuman skeleton, and to explore which skeleton structure has the highest compatibility with the MetaHuman skeleton.This research provides an efficient skeleton reorientation idea for the production team of 3D animated video content, which can significantly reduce time costs and improve work efficiency.

• Physical Therapy Rehabilitation Science
• /
• v.13 no.1
• /
• pp.106-112
• /
• 2024

Objective: This study aimed to evaluate the validity of a depth camera-based system for monitoring physical function, assessing its feasibility for accurately monitoring activities of daily living. Design: A cross-sectional study. Methods: Twenty-three participants were enlisted to perform fifteen activities of daily living within a living laboratory designed to simulate a home environment. Activities were monitored using a depth camera system capable of classifying actions into standing, sitting, and lying down, with a conventional video camera employed for activity recording. The duration of each activity, as measured by the system, was compared to direct observations made by a physical therapist which were analyzed using a motion analysis software. The association between these two measurement approaches was assessed through correlation analysis, coefficient of determination, intraclass correlation coefficient (ICC), and Bland-Altman plots. Results: Our findings indicated that standing activities exhibited the highest correlation (r=0.847) between the system measurements and physical therapist observations, followed by sitting (r=0.817) and lying down (r=0.734), which demonstrated lower correlations. However, the ICC and Bland-Altman plots revealed notable variances between the two measurement methods, particularly for activities involving lying down. Conclusions: In this study, the depth camera-based physical monitoring system showed promise feasibility in distinguishing standing, sitting, and lying down activities at home environments. However, the current study also underlined some necessities of enhancements in capturing lying down activities.

• The Journal of Korean Academy of Sensory Integration
• /
• v.10 no.1
• /
• pp.21-31
• /
• 2012

Objective : This study aims to examine the Effect of the Brotherhood Group Sensory Integration intervention to Social Interaction of the Children with Pervasive Developmental Disorders. Methods : The Group Sensory Integration intervention was implemented for 8 weeks period from July to September 2011 targeting 2 children of 7~8 ages diagnosed Pervasive Developmental Disorders. For the study A-B-A' design among Single subject research design was used, while baseline A 3 phases, intervention B 16 phases, baseline A' 3 phases in total 22 phases were applied. The Quality of Social Interaction was measured through ESI(Evaluation Social interaction) during the baseline between A and A' period, and the Frequency of Social Interaction was measured under the condition that non-availability of intervention during baseline period, while during intervention period, it was measured by utilizing Interval recording method upon filming by video of 10 minutes free-play after every intervention. Results : The Quality of Social interaction indicated a statistical significance by all targeted children after intervention. Also a statistical significance was indicated in the Frequency of Social interaction as there appeared consecutively more than two of the values of baseline A average and Standard deviation band from all targeted children at the free-play implemented after each intervention of every phase. Conclusion : It could be verified that Brotherhood Group Sensory integration intervention has a positive effect to Social interaction of the Children with Pervasive Developmental Disorders. Therefore, the Brotherhood Group Sensory integration intervention can be effectively applicable as being a therapy to improve Social interaction toward Children with Pervasive Developmental Disorders at the clinic.

• Journal of the Korean Geographical Society
• /
• v.46 no.6
• /
• pp.707-723
• /
• 2011

The purpose of this study was to quantitatively evaluate the effectiveness of learning management systems (LMS) in the physical geography class. The study adopted the experimental design and three classes participated in this study. The first class was controlled using only classroom lectures, the second class used PPT slides along with the classroom lectures, and the third class used online video clips along with the lectures. The experiments were conducted from the Spring Semester 2007 to the Spring Semester 2008 for the introductory physical geography course. The study results showed that online learning tools help students improve academic performance and their attitudes towards the class and the instructor. Compared to simple PowerPoint slides, voice recording attached to the visual lecture slide materials enhanced students' motivation. Class lectures with lecture slides did not improve students' scores. However, when the visual materials were combined with voice recording, the number of internet access to online class materials increased, and class attendance and students' final grades were improved. Based on the results, the instructional design model that combines classroom and online learning was suggested.

• Education of Primary School Mathematics
• /
• v.22 no.4
• /
• pp.261-280
• /
• 2019

This study is a qualitative study on the case of teaching mathematics between parents and children. 12 lesson units were applied to the 5th grade elementary school child for the first semester, 2019. The purpose of this study was to identify conceptual understanding in the area, the types of problems that child felt difficult during the learning and parents' advantages and difficulties in this setting. For this study, video recording and voice recording were collected for each lesson class. The concept of the area was recognized correctly, the awareness of reconstruction became clear, and the concept of partitioning, unit iteration and structuring an array was more clearly rebuilt. He showed difficulty in conversion between units of the area, in displaying height of the shape whose height is displayed outside and drawing type of figure with same area after the value of the area was offered. In the learning situation of parents and children, parents who are researchers have the advantage of being able to customize up to their children and being free from time and cost constraints. There were difficulties in controlling negative emotion toward the child, determining the level of the children, distribution the class time and deciding the degree of intervention. Furthermore, research on parenting and child-to-parent teaching in mathematics is recommended.

• The Journal of the Convergence on Culture Technology
• /
• v.1 no.2
• /
• pp.1-19
• /
• 2015

The history of modernization of Korea is divided into two folds of the colonial era in the 20's and the economic development era in the 60's. Most of the spaces built in the process of modernization were public spaces developed by the drive of the government. These spaces of modernization are functionality-oriented public places of production and at the same time, and they are the spaces of national power to symbolize the identity of national authorities. Along with changes in the society, modern spaces were reduced down to monument buildings without functionality and this requires new definition to renew the identity of modern spaces. Small stations, power plants, mines, warehouses, abandoned factories, and etc... the study has paid attention to the process of changing thought, one of the main characteristics of modernization, the relations of modern concepts projected in the spaces, framework of modern society, and placeness in the process of framework building and relations of people in the spaces with video records on the process of rebuilding new identity of modern spaces and memories of the spaces. The relations of modern spaces and memory were explored in < Seoul Station > while the relations between modern spaces and records and place identity were explored in < Onyang Folk Museum > and < Okpo Shipyard > respectively. In the relations between space identity and memory in each space, the ironic relations of power in modern spaces (placeness) and personal narrative (memories) were explored with oral narrative and video footage.