• Proceedings of the KIPE Conference
• /
• 2002.07a
• /
• pp.443-446
• /
• 2002

Brushless DC motor(BLDCM) are suitable to operate in a wide speed range, easy to control and since there are no mechanical brushes and commutators, require low maintenance costs and are free from restrictions of application environment. And since the ratio of instantaneous torque and rated torque is high, BLDCM are appropriate for variable speed operation. This paper proposes the optimal model by using Matlab/simulink based on modelling and characteristic analysis of trapezoidal back EMF type BLDCM and verifies the validity of the proposed model by applying control systems.

• The Journal of Pediatrics of Korean Medicine
• /
• v.17 no.2
• /
• pp.213-224
• /
• 2003

Background and Objectives: Nocturnal enuresis is a common problem that can be troubling for children and their families. Treatment options include nonpharmacologic and pharmacologic measures. Various nonpharmacologic treatments have been shown to have a positive effect on bed-wetting in small studies but have not been extensively evaluated (generally weak strength of evidence). This study was undertaken to determine if there is any evidence for the clinical efficacy of acupuncture for treatment of nocturnal enuresis. Methods : Author conducted a computerized literature search in following database: Medline(via Pubmed), NDSL. There were no restrictions on the language of publication. The data were extracted in a standardized, predefined manner and assessed critically. Results : 4 article was selected. Acupuncture is composed of general acupuncture, electro, laser. Acupuncture treatment of the children had significantly more dry night than before treatment Conclusion : Alternative, nonpharmacological approach using acupuncture works in children with monosymptomatic nocturnal enuresis.

• 유체기계공업학회:학술대회논문집
• /
• 2005.12a
• /
• pp.503-508
• /
• 2005

An advanced Research Reactor (ARR) consists of an open-tank-type reactor assembly within a light water pool and generates thermal power of 20 MW. The thermal power is including a fission heat in the core, a fuel generated heat temporary stored in the pool, a circulating pumps generated heat and a neutron reflecting heat in the reflector vessel of the reactor. In order to remove the heat load, the primary cooling system will be installed. In this study, the conceptual design of the primary cooling system has been carried out using a design methodology of HANARO within a permissible range of safety. As results, it has been established that the conceptual design of the primary cooling system including design requirements, performance requirements, design restrictions, system descriptions and system operation to maintain the system functions.

• The Korean Journal of Rehabilitation Nursing
• /
• v.6 no.1
• /
• pp.61-69
• /
• 2003

The purpose of this phenomenological study was to understand and describe the essence and the structure of lived experience of liver transplant recipient. Five individual interviews were conducted to gather data regarding their subjective experiences. About 130 significant statements were extracted and these were clusterd into 9 themes. End stage liver disease patients chose their last treatment - liver transplantation. After liver transplantation, recipients experience vague anxiety and uneaseness related to much information and life style change that they had to accept. And they feared to lose their health again. But they felt free from medication and restriction of food. And they satisfied with regaining their physical status. Most of the recipients also had financial difficulties and social restrictions. And they experience uncertainty about their future. But they restored their previous social life. And they experience psychological wellbeing and hope. The results of this study might help nurses who work with liver transplant recipient in establishing and implementing an effective nursing intervention by understanding their lived experience.

• Journal of the Korean Operations Research and Management Science Society
• /
• v.27 no.4
• /
• pp.67-86
• /
• 2002

This paper considers subway crew scheduling problem. Crew scheduling is concerned with finding a minimum number of assignments of crews to a given timetable satisfying various restrictions. Traditionally, crew scheduling problem has been formulated as a set covering or set partitioning problem possessing exponentially many variables, but even the LP relaxation of the problem is hard to solve due to the exponential number of variables. In this paper. we propose two basic techniques that solve the subway crew scheduling problem in a reasonable time, though the optimality of the solution is not guaranteed. We develop an algorithm that solves the column-generation problem in polynomial time. In addition, the integrality of the solution is accomplished by variable-fixing technique. Computational result for a real instance is reported.

• 제어로봇시스템학회:학술대회논문집
• /
• 2000.10a
• /
• pp.414-414
• /
• 2000

This paper presents a method for building a real-time kernel of autonomous mobile robot control systems. Until now, most of robots have their own operation softwares dedicated only for their use. Sometimes, operation softwares were developed based on MS-DOS or other real -time kernel based on UNIX. However, MS-DOS has many restrictions for use as a robot operation system. Also, mix based real-time kernel has some Limitations for use with mobile robots. So, in this paper, we focus on building a real-time kernel based on Linux. The in this paper, the software modules of Task Management, Memory Management, Intertask Communication, and Synchronization are redesigned. To show the efficiency of the paper, it was applied to run Nomad Super Scout II avoiding obstacles detected by sonar sensor array.

• Proceedings of the KSRS Conference
• /
• 2007.10a
• /
• pp.445-448
• /
• 2007

Korea Peninsula is exposed to landslide problems because large regions of Korea are composed of mountain. As a result, we have a great loss of life and property every year, such as road, bridge, and building. However, conventional survey has many restrictions of time and man power. In recent days, instead of field surveying, remote sensing has our attention for detecting damaged place. Synthetic Aperture Radar (SAR) provides the all-weather capability and complements information available. And through the 2-pass DInSAR technique, we can measure even very small displacement effect. In this study, we generated six interferograms of Kangwondo between 1992 and 1998, and estimated the vulnerable place for landslide.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.10 no.7
• /
• pp.3117-3130
• /
• 2016

High peak-to-average power ratio (PAPR) of transmitted signals is a major drawback in Multicarrier modulation (MCM) systems. Companding transform is a well-known method to reduce the PAPR without restrictions on system parameters such as the number of subcarriers, frame format and constellation type. In this paper, a novel adaptive companding scheme, mainly focuses on compressing the large signals into the desirable distribution, is proposed to reduce the PAPR with low implementation complexity. In addition, formulas to calculate its PAPR and bit error rate (BER) performance are also derived. Simulation results confirm that the proposed scheme can achieve an effective tradeoff between PAPR reduction and BER performance by carefully choosing the companding parameter.

• Journal of Korea Society of Industrial Information Systems
• /
• v.11 no.5
• /
• pp.132-140
• /
• 2006

Implementing ERP system is inherently a very complex task that involves ongoing training employees to use the new system. However, the traditional methods of ERP training and education have presented many problems. A new form of training, e-learning, has emerged. E-learning enables trainees to sign on classes without restrictions of time, distance, and classroom availability. We suggested several usage strategies and e-learning combined model for ERP related organizational change management.

• Journal of Korea Society of Industrial Information Systems
• /
• v.3 no.1
• /
• pp.49-65
• /
• 1998

The trend toward globalization and competitive advantage is increasing the importance of international data communication . The more companies attempt to be globalized and competitive, the more critical the problems of the computer networks are. To improve computer networks in the business world, it is believed that the network shoud be approached from the viewpoint of service quality : we need to understand what network quality means to network users, those who use the network. The purpose of this study is to develop a dimension that captures the aspects of network quality that are important to network users. Many articles show that speed is very important factor in network systems. But the more important thing is that speed is just one of the factors contributing to network quality. It is suggested that a quality network meet nine dimensions : (1) speed (2) accessibility (3) connectivity (4) security (5) compatibility, (6) government restrictions (7) complexity (8) sustainability and (9) sharability.