• Korean Journal of Adult Nursing
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• v.16 no.4
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• pp.636-647
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• 2004

Purpose: This study aimed at developing the problem-based learning packages on the respiratory and cardiac system of an adult-health nursing course, and to examine the effect of PBL on the knowledge, learning attitude and motivation in nursing students. Method: A total of 7 PBL packages were developed through the analysis of learning contents and integration of concepts. Clinical scenarios used in 7 PBL packages were selected and composed at a respiratory and a cardiovascular unit, a medical ICU and a chest-surgery unit of C university hospital in G-city. The PBL method was implemented 3 hours a week for 12 weeks to 35 students of an experimental group, and the conventional lecture was implemented to 38 students at C college of C province from Sept. to Dec. 2002. A pretest-posttest experimental design was used. Result: The PBL students (n=35) scored significantly higher knowledge than conventional students (n=38) in the area of problem solving (t=3.418, p=. 001). But, there is no significant difference in the memory-dependent knowledge. Also, The level of learning attitude (t=3.570, p=. 001) and learning motivation (t=3.446. p=. 001) was significantly higher in PBL students. Conclusion: PBL method appears to be effective in improving nursing students' problem-solving knowledge and positive learning attitude and motivation.

• Journal of Korea Multimedia Society
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• v.18 no.9
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• pp.1098-1104
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• 2015

With the widespread use of smartphones and IoT (Internet of Things), data are being generated on a large scale, and there is increased for the analysis of such data. Hence, distributed processing systems have gained much attention. Hadoop, which is a distributed processing system, saves the metadata of stored files in name nodes; in this case, the main problems are as follows: the memory becomes insufficient; load occurs because of massive small files; scheduling and file processing time increases because of the increased number of small files. In this paper, we propose a solution to address the increase in processing time because of massive small files, and thus improve the processing performance, using the Reuse JVM method provided by Hadoop. Through environment setting, the Reuse JVM method modifies the JVM produced conventionally for every task, so that multiple tasks are reused sequentially in one JVM. As a final outcome, the Reuse JVM method showed the best processing performance when used together with CombineFileInputFormat.

• Journal of Internet Computing and Services
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• v.8 no.5
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• pp.59-66
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• 2007

In korea, TIT(Transport Information Technology) based IP-TV services have been provided in Saemaeul trains and some sections of subway trains, But the software systems for the service performed in alternated fashions and suffered from many problems such as suspension, memory leaking and overflow, These problems increased playback loss time and resulted in bad reliabilities, In this paper, a software TIT monitor is designed and implemented for Monitoring module and Reset module in physically poor environments, The designed system formalized monitoring time intervals for effective monitoring, Through the real experiments, playback time is improved in 7.2% comparing to existing system.

• Journal of Korean Institute of Industrial Engineers
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• v.41 no.3
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• pp.275-286
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• 2015

In this paper, we propose a practical method for setting up a daily production plan which can operate semiconductor fabrication factories more stably and linearly by determining work in process (WIP) targets and movement targets. We first adjust cycle times of the operations to satisfy the monthly production plan. Second, work in process (WIP) targets are determined to control the production progress of operations: earliness and tardiness. Third, movement targets are determined to reduce cumulated differences between WIP targets and actual WIPs. Finally, the determined movement targets are modified through a simulation model which considers capacities of the equipments and allocations of the WIPs in the fab. The proposed daily production planning method can be easily adapted to the memory semiconductor fabs because the method is very simple and has straightforward logics. Although the proposed method is simple and straightforward, the power of the method is very strong. Results from the shop floor in past few periods showed that the proposed methodology gives a good performance with respect to the productivity, workload balance, and machine utilization. We can expect that the proposed daily production planning method will be used as a useful tool for operating semiconductor fabrication factories more efficiently and effectively.

• The Journal of Pediatrics of Korean Medicine
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• v.31 no.4
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• pp.49-60
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• 2017

Objectives The purpose of this study is to report the effectiveness of Korean medicine on treating autism spectrum disorder (ASD) in childhood. Methods We treated an 8-years-old patient who was diagnosed with autism (grade II) with herbal medicine, acupuncture and electric moxibustion. Every 11 months, Korean-Childhood Autism Rating Scale (K-CARS) was used to assess the patient's symptom progression. Results After 21 months of Korean medicine treatment, the child's overall health was improved. Moreover, language ability, emotional control, memory and cognitive abilities got better, as well as anxiety, agitation, and aggressive behavior related to ASD were also decreased. K-CARS score at the initial stage of the treatment was 39.5 points, which can be considered as severe autism. After 11 months of the treatment, the K-CARS score was 34.5 points which is mild-moderate autism. Conclusions Korean medicine treatment can be effective in improving symptoms of ASD. However, further studies are needed to demonstrate the treatment benefits to ASD.

• Journal of Astronomy and Space Sciences
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• v.31 no.2
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• pp.121-130
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• 2014

Essential ideas, successes, and difficulties of Areal Density Analysis (ADA) for color-magnitude diagrams (CMD's) of resolved stellar populations are examined, with explanation of various algorithms and strategies for optimal performance. A CMD-generation program computes theoretical datasets with simulated observational error and a solution program inverts the problem by the method of Differential Corrections (DC) so as to compute parameter values from observed magnitudes and colors, with standard error estimates and correlation coefficients. ADA promises not only impersonal results, but also significant saving of labor, especially where a given dataset is analyzed with several evolution models. Observational errors and multiple star systems, along with various single star characteristics and phenomena, are modeled directly via the Functional Statistics Algorithm (FSA). Unlike Monte Carlo, FSA is not dependent on a random number generator. Discussions include difficulties and overall requirements, such as need for fast evolutionary computation and realization of goals within machine memory limits. Degradation of results due to influence of pixelization on derivatives, Initial Mass Function (IMF) quantization, IMF steepness, low Areal Densities ($\mathcal{A}$), and large variation in $\mathcal{A}$ are reduced or eliminated through a variety of schemes that are explained sufficiently for general application. The Levenberg-Marquardt and MMS algorithms for improvement of solution convergence are contained within the DC program. An example of convergence, which typically is very good, is shown in tabular form. A number of theoretical and practical solution issues are discussed, as are prospects for further development.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.36 no.12
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• pp.874-887
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• 1987

The efficiency of a synchronous motor can be substantially improved by controlling armature voltage, field excitation, and load angle on optimum values which yield minimum input power at any specified torque and speed. This improvement is particularly noticeable in the case of light loads. In addition, the control of armature input voltage improves the power factor at which the motor operates. Employed in the analysis is a new equivalent circuit model of the motor which incorporates the frequency dependent nature of the motor parameters and the effects of iron loss. The stability of synchronous motor operation is studied by applying the Nyquist stability criterion to the linearized equations which describe the behavior of the motor as the motor loads perturb about a steady-state operating point. This investigation reveals that, in some cases, the stable region of the motor is delineated from the results of a computer simulation. With a view to reducing harmonic loss and improving torque pulsation from harmonic components, a very poweful pulse amplitude modulation (PAM) method using an 16-bit microcomputer has been developed. This method has the advantages of simplicity of control algorithms and requires small memory space for storing thyristor trigger angles for a three-phase PAM inverter. The method can be used for smooth control of both modulation depth and frequency over a wide range.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.11C
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• pp.1058-1065
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• 2006

In this paper, we propose a new motion vector coding algorithm suitable for MPEG-4 Part 10 video coding standard. In the proposed algorithm, the amount of the motion for a given video sequence is Predicted by using a characteristic of the motion vector distribution for the neighboring blocks as well as the MB_type, which is the syntax element in the standard. And one of the independent coding and the combined coding methods is adaptively employed to compress the motion vector difference. Simulation results show that the proposed algorithm outperforms the conventional methods without additional memory and calculations.

• Proceedings of the ESK Conference
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• 1987.04a
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• pp.143-148
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• 1987

The Design of automotive IP must be designed for improving safety, and for satisfying the consumer's preference and for enlarging the usability of various gauges and information displaydevices. Also, these objects become more important by regarded and will be treated very sensitively for the next-generation vehicle concepts. Therefore, Automotive IP must be designed to adjust these trends, besides accord with car-inner lifestyle. One of these concept's designs is to apply Human Sensibility Ergonomics. This study suggestes the driver-centered design of the IP components that focused on the audio unit and HVAC(Heat and Ventilation Air Conditioner) through cognitive experiment. Primarily, analyzed components of IP in use, then, combined these components (especially, the number and arry of buttons, the position of LCD panel, etc.) nd designed some sample images(prototypes) the same as real size. After the subjects looked at the sam ples at the interval of 0.2/0.4/0.6 seconds, subjects should fill out the given forms from their memory. Then, the optimal prototype of IP was designed in respect to the correctness of cognition. The results will show the basic guideline of optimal design of IP that in the case of aaudio unit, the position of LCD, the array and the number of channel, in the case of HVAC, the position of LCD, TEMP button type and other button types.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.21 no.3
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• pp.208-212
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• 2008

This paper reports physical properties of in situ boron doped silicon films made from boron source gas and silane ($SiH_4$) gas in a conventional low-pressure chemical vapor deposition vertical furnace. If the p-type polysilicon is formed by boron implantation into undoped polysilicon, the plasma nitridation (PN) process is added on the oxide in order to suppress boron penetration that can be caused during the thermal treatments used in fabrication. In-situ boron doped polysilicon deposition can complete p-type polysilicon film with only one deposition process and need not the PN process, because there is not interdiffusion of dopant at the intermediate temperatures of the subsequent steps. Since in-situ boron doped polysilicon films have higher work function than that of n-type polysilicon and they are compatible with the underlying oxide, they may be promising materials for improving memory cell characteristics if we make its profit of these physical properties.