• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2006.06b
• /
• pp.67-74
• /
• 2006

In this paper, an adaptive neural network controller and its application to automatic berthing control of ship is presented. The neural network controller is trained online using adaptive interaction technique without any teaching data and off-line training phase. Firstly, the neural networks used to control rudder and propeller during automatic berthing process are presented. Finally, computer simulations of automatic ship berthing are carried out to verify the proposed controller with and without the influence of wind disturbance and measurement noise.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2001.11b
• /
• pp.775-779
• /
• 2001

In optical disk drive (ODD), disk rotation speed has been increasing rapidly to achieve high data transfer rate. High servo bandwidths for focusing and tracking actuator are required to follow dynamic disturbance by high rotation speed in ODD. However, the servo bandwidth is significantly limited by some vibration modes which are induced by the flexibility of moving part. In this work, the vibration modes affecting bandwidth of actuators are suppressed by modifying actuating force by VCM. For this, the relation between the horizontal component of the actuating force and vibration mode is analyzed and force characteristic affecting to vibration mode is obtained through electromagnetic and structural analysis using simulation program.

• Membrane and Water Treatment
• /
• v.10 no.2
• /
• pp.149-154
• /
• 2019

The information matter-element system was built to assess safety of water source. Based on the thought of multiindex fusion, fuzzy matter-element model evaluating water source behavior was constructed by matter-element transform. This model can process comprehensively hydrogeological data, ecological environment, water pollution, surface disturbance, and so on. Water source safety behavior can be described by the qualitative and quantitative manners. According to the development trend of quantitative results, water source safety behavior can be expressed dynamically. As an example, the proposed method was used to assess safety status of 7 water sources in the region. The numerical example shows that the proposed method is feasible and effective, and the evaluation results are reasonable.

• International Journal of Naval Architecture and Ocean Engineering
• /
• v.13 no.1
• /
• pp.57-64
• /
• 2021

Maneuvering motions of a ship in calm water are studied through the concept of MMG model. Governing forces are defined by the use of available empirical formulae that require only main ship particulars as input variables. In order to validate the calculation tool, a full-scale sea experiment was carried out in Osaka Bay using a 17-m twin-screw passenger ferry. Test execution and data measurement were performed through the utilization of an autopilot control unit and satellite compass. The result of a straight running test confirms the acceptable accuracy in addressing the surge motion problem. Reasonable agreement between simulation and experiment is also confirmed for 5°/5° and 10°/10° zig-zag tests despite the strong environmental disturbance. The current model can generally represent the subject ship maneuvering motions and is promising for the application to other ship hulls.

• International Journal of Advanced Culture Technology
• /
• v.10 no.4
• /
• pp.427-433
• /
• 2022

Although the National Intelligence Service Act has been amended considering the growing importance of economic counterintelligence, a clear interpretation of certain provisions and improvement of the effectiveness of economic counterintelligence are required. This article presents some suggestions for regulations on economic counterintelligence. Firstly, the meaning of the term "disturbance of economic order in connection with foreign powers" will become clear by interpreting it with the terms of the Counterintelligence Duty Regulation and by setting categories referring to the U. S. regulations. Secondly, counterintelligence authorities' request for cooperation may be reinforced by amending relevant regulations or by applying a special procedure for the acquisition of data. Finally, strengthened punishment for activities in connection with foreign powers may improve the efficiency of counterintelligence. For these reasons, this paper aims to present a direction for the future, focusing on this new economic counterintelligence.

• International conference on construction engineering and project management
• /
• 2015.10a
• /
• pp.138-141
• /
• 2015

The South Korean construction industry has shown a high proportion of industrial accidents (approximately 28% of whole injuries) and the continuously increasing accident rate. Although many safety research emphasized that the 3E (Enforcement, Education, and Engineering) approach is a potential solution to enhance workplace safety, there should be benefits to consider psychological (i.e., Emotional) effects on the safety performance since most construction works are human-oriented. Thus, understanding construction workers' psychological conditions can be a priority. This research studied the relationships between psychological conditions-which cover stress, personal temperament, emotional disturbance, and drinking habit-and specific safety-related factors including safety motivation and knowledge, and safety performance of individual workers at a construction site. This study conducted a survey of 430 respondents and analyzed the data with the multiple linear regressions. The results imply persistence, trait anxiety, and problem-focused coping style are the critical factors that should be controlled for enhancing jobsite safety. Finally, the research outcomes could be applied to build a strategic safety management plan for a construction manager.

• Journal of the Korean Applied Science and Technology
• /
• v.41 no.2
• /
• pp.436-446
• /
• 2024

This study contemplates the effect of social media advertising attributes on consumers' purchasing decisions in cosmetic products. It will serve as basic data for SNS's advertising strategy and marketing that promotes cosmetics sales. This study conducted a survey and went through the analysis process of SPSS v.25.0 statistical program. Frequency analysis, exploratory factor analysis, descriptive statistical analysis, correlation analysis, and regression analysis were conducted to analyze that informativity, reliability, entertainment, interactivity, and disturbance among SNS advertising attributes were used as effective advertising strategies, which had a positive effect on consumers' purchasing decisions. Therefore, in the cosmetics industry, it is necessary to seek strategies to actively utilize marketing in the social media space to promote consumers' purchase needs and to activate purchases.

• Journal of Korean Academy of Nursing
• /
• v.39 no.4
• /
• pp.539-548
• /
• 2009

Purpose: This study was designed to construct and test the structural equation model on sexual satisfaction in patients with a colostomy. Methods: The model construction was based upon Roy's adaptation model. Stoma-related discomfort (SRD), age, frequency of sexual intercourse, treatment modality, and gender affect sexual satisfaction and are mediated by physical, psychosocial, and interdependence modes. Each mode was conceptualized as sexual function, body image/ depression, and marital intimacy. The patients were 112 colostomates with colorectal cancer who were asked to complete a mail-back survey on their demographic data, SRD, body image, depression, marital intimacy, sexual function, and sexual satisfaction. Data were analyzed using SPSS WIN 15.0 and AMOS WIN 7.0. Results: Significant variables for sexual satisfaction in the final model were body image affected by SRD, depression affected by body image and SRD, marital intimacy affected by depression, and sexual function affected by marital intimacy. Conclusion: The results of this study suggest that specific guidelines for SRD are necessary to improve sexual satisfaction among colostomates. Nurses should be vigilant in monitoring depression and body image disturbance, and providing appropriate interventions to increase marital intimacy. Treatment modality, gender, and age should be considered in developing education programs pertaining to sexuality.

• Korean Journal of Adult Nursing
• /
• v.27 no.4
• /
• pp.428-437
• /
• 2015

Purpose: The aim of this study was to describe health status and to identify the factors related to health behavior in older adults in South Korea. Methods: A cross-sectional survey was conducted with a convenience sample of 186 older people (mean age =68.2yrs, 65.1% Female) registered at one senior center. Data were collected by self-report questionnaires or through face to face interview. The instruments were the Modified Health Behavior Assessment Scale, Stanford Research Instruments for Chronic Disease, Self-Efficacy, SOF Frailty Index and Quality of life questionnaire. The data were analyzed using t-test, ANOVA, Pearson's correlation, and stepwise multiple regression. Results: 58.6% older adults perceived their health status positively. Education level and economic status were significantly related to health behaviors of older adults. Self-rated health, sleep, stress, quality of life, health distress, depression, and frailty were significantly correlated with the health behaviors of older adults. Frailty, education level, and sleep disturbance were the significant factors predicting the health behaviors. Conclusion: The findings from this study suggest that nurses should take into consideration education level of older adults to promote their health behaviors and health promotion program which focuses on maintaining the quality of sleep and preventing frailty.

• Korean Journal of Adult Nursing
• /
• v.22 no.5
• /
• pp.457-465
• /
• 2010

Purpose: This study was conducted to examine the degrees of depression and activities of daily living (ADLs), and to identify factors that predict depression in elderly patients. Methods: The sample was149 patients (80% female; mean age 79.1) from three geriatric hospitals located in small cities and who agreed to participate in the study. Data were collected by staff nurses involved in direct patient care from October to September 2009. The level of depression was measured on a daily basis for seven days using a 13-item scale. Patients' ADLs was measured using a modified 10-item Bathel ADLs scale. Data were analyzed using SPSS/WIN 17.0. Results: Mean depression score was $10.05{\pm}4.77$ out of 26 points and about 27% was assessed as depressed with more than 13 points. Multiple regression analysis showed that low educational level, absence of spouse and fewer family visits predict depression. In addition, low ADLs and sleep disturbance predict depression. Conclusion: Nursing care providers need to be concerned about ADLs of older patients and should develop nursing activity programs to increase their in-hospital physical activities. It is also important care for older patients' sleep and encourages family visits to decrease their depression.