• Journal of the Korean Operations Research and Management Science Society
• /
• v.32 no.3
• /
• pp.63-80
• /
• 2007

This study is a generalization of 'stable dynamics' recently suggested by Nesterov and de Palma[29]. Stable dynamics is a new model which describes and provides a stable state of congestion in urban transportation networks. In comparison with user equilibrium model that is common in analyzing transportation networks, stable dynamics requires few parameters and is coincident with intuitions and observations on the congestion. Therefore it is expected to be an useful analysis tool for transportation planners. An equilibrium in stable dynamics needs only maximum flow in each arc and Wardrop[33] Principle. In this study, we generalize the stable dynamics into the model with multiple traffic classes. We classify the traffic into the types of vehicle such as cars, buses and trucks. Driving behaviors classified by age, sex and income-level can also be classes. We develop an equilibrium with multiple traffic classes. We can find the equilibrium by solving the well-known network problem, multicommodity minimum cost network flow problem.

• Journal of the Institute of Convergence Signal Processing
• /
• v.10 no.3
• /
• pp.176-180
• /
• 2009

This paper investigates protocol architecture for a web-sensor gateway interconnecting internet and wireless sensor network, in which Zigbee sensors are connected over the IEEE802.15.4 communication protocol standard. The web-sensor gateway is to deliver data between TCP/IP and Zigbee/IEEE802.15.4 protocols, transparently. Since the gateway provides a means to remotely control and aggregate sensor data over the internet, it needs to be designed in the view point of users and in their convenience. In accordance, the common gateway interface technology satisfying users on the web browser to efficiently manage and query the sensors in the wireless sensor networks, ubiquitously, is also introduced. Finally, a simulation prototype for the web-sensor gateway is proposed and verified using OPNET simulation tool.

• Journal of the Korean Society for Railway
• /
• v.6 no.1
• /
• pp.66-72
• /
• 2003

Railway sign(graphic sign, diagraphics) designs require good recognition with universality to transmit accurate and speedy information as they connect people around the station and other transport systems. An important point of signs is how to design and deliver the contents to the viewers as a communication service tools. It needs to establish design guidelines with standardization and unified system to show their contents and images clearly like common language with visuality, attractivity and generality. These requisites are important for both aesthetics legibility and unified standards to maximize the effectiveness of pictograms for the use of the general public, who require systematic suggestion and management.

• Journal of the Korean Institute of Telematics and Electronics
• /
• v.14 no.2
• /
• pp.32-38
• /
• 1977

To organize the least control information for vector-drawing Korean characters, relatively simple 'Shortest Route Searching Algorithms' which can be applied to Korean character patterns were constructed. The shortest drawing routes and the common starting point for all charcters were found with this algorithm. It is shown that the vectors, which needs the least control informations to follow the shortest drawing route, are those vertical and horizontal vectors which have the size of 1 arid 3 times of raster distance. The vector control information for drawing 33 Korean characters including 9 double consonants and vowels can be organized with 7 bits 463 words of horizontal format informations which are corresponding to 3,241 bits.

• Korean Journal of Computational Design and Engineering
• /
• v.15 no.6
• /
• pp.467-475
• /
• 2010

Due to the needs of design optimization and productivity for modernized Korean traditional house, standardization of Korean traditional building components is proceeding by BIM (Building Information Modeling). Currently, most of BIM software support object-based parametric modeling. By means of parameterized Korean traditional building components, the shape and assembly relation can be controlled. Although IFC(ISO/PAS 16739), which is an international standard in the AEC field, has been developed for information exchange among BIM software, IFC and other existing common data formats cannot be exchangeable parametric information. For the exchangeable parametric information within IFC, the authors defined meta-data by using Pset(Property-Set). The authors analyzed results about interoperability test in Revit $Architecture^{TM}$, $ArchiCAD^{TM}$ and Digital $Project^{TM}$. In order to solve found problems, the authors developed a translator to improve interoperability among BIM software.

• Journal of Family Resource Management and Policy Review
• /
• v.3 no.2
• /
• pp.77-89
• /
• 1999

This study examines managerial aspects of the institutional household(IH) whose importances become crucial in modern society. To analyze idiosyncratic managerial characteristics of the IH, the study delves into three aspects of IH in comparison with other organizations such as family, public organizations, for-profit organizations. The comparison is done in the reference of $\circled1$ conceptual elements, $\circled2$ general managerial settings, and $\circled3$ practical managerial processes including planning, organizational, personnel and human resources development, and finacial management. The analysis shows us that the IH possesses both common and unique characteristics and needs to develop its generic managerial theories.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2002.10a
• /
• pp.474-480
• /
• 2002

Aspheric optical lenses and mirrors are widely used in recent. It is more difficult to manufacture and measure the aspherical optics compared to conventional spherical ones. The interferometric optical test is common for the measurement of spherical optical surface. But the application of the interferometry to the measurement of aspheric surface is difficult because it needs a precise null corrector and very careful environmental conditions such as keeping constant temperature, humidity, atmospheric pressure and vibrations. To enhance productivity of optics manufacturing on-machine measurement and correction has been developed in this study. For practical applications, robustness of the measurement method to environments is more important. For the purpose an optical OMM(On-Machine Measurement) system has been developed using Shack-Hartmann test which has robustness to the environment. The wavefront has been reconstructed from the measured data using the primary aberration polynomial function by least square fitting. The measured result of the developed only system gives the maximum deviation only in 200 nm from the result measured by a commercial Fizeau interferometer Wyko 6000.

• Proceedings of the KSR Conference
• /
• 2003.05a
• /
• pp.176-184
• /
• 2003

Railway sign(graphic sign, diagraphics) designs require good recognition with universality to transmit accurate and speedy information as they connect people around the station and other transport systems. An important point of signs is how to design and deliver the contents to the viewers as a communication service tools. It needs to establish design guidelines with standardization and unified system to show their contents and images clearly like common language with visuality, attractivity and generality. These requisites are important for both aesthetics legibility and unified standards to maximize the effectiveness of pictograms for the use of the general public, who require systematic suggestion and management.

• Child Health Nursing Research
• /
• v.6 no.1
• /
• pp.89-102
• /
• 2000

Asthma is one of the most common chronic disease of childhood. Although an improved understanding of the pathophysiology of asthma has had a positive impact on the treatment and management of the disease, there has been a gradual but significant increase in asthma mortality. Also, mother's caring type is the essential factor in management of the child with asthma. The purpose of this study is to identify and understand the caring patterns of mathers of children with Athma by Q methodology. As a research method, 35 Q-statements were collected through individual interviews and review of related literatures. 37 subjects were interviewed and the data were analyzed by the PC QUANL program with principal component analysis. The were 3 different caring types classified as follows : Type I was the therapeutic compliance obeying type, compliancing medication and preventing cold etc. Type II was the physical strengthening type, taking Chinese medicine and folk remedy etc. Type III was the environment control type, managing house and environment clearly and ventilating room air etc. Therefore, it needs considering above each type in nursing care of the family and children with asthma.

• Korean Journal of Computational Design and Engineering
• /
• v.11 no.6
• /
• pp.422-428
• /
• 2006

In this paper, an NC data optimization approach for enhancing 5-axis machining speed is presented. It is usual to use expensive commercial CAD/CAM programs for NC data of 5-axis machining, since it needs very large calculations for optimal tool positioning and orientation, tool path planning, and collision-free tool path generation. Since commercial CAD/CAM systems have similar functions and efficiency based on common algorithms of reliable theories, they do not have their own unique features for machining speed and efficiency. In other words, most commercial CAD/CAM systems consider only the characteristics of part geometry to be machined, which means that they generate almost the same NC data if the part to be machined is the same, even though different machines are used for the pin. A new approach is proposed for optimizing NC data of 5-axis machining, which is based on the characteristics of the machine to be operated. As a result, the speed of 5-axis machining can increase without losing machining accuracy and surface quality.