• 한국HCI학회:학술대회논문집
• /
• 2008.02a
• /
• pp.280-285
• /
• 2008

ZigBee is Low Power and Low Data Rate Wireless Communication protocol. It apply to much Ubiquitous Sensor Network. ZigBee PAN is two type PAN. One is Beacon Enabled PAN, the other is Non Beacon Enabled PAN. To support Low Power in Non Beacon Enabled PAN, End-Device enter Active status at End-Device's wishing time and send a data. So, Router does not know End-Device sends a data time. To solving this problem, Router must always exist to Active status. In this case, Router receive a power supply always in Non Beacon Enabled PAN. But Router does not receive a power supply always, Router can not normal operation, such as Router use a battery. To solve this problem, Router will be support low power. In this paper, we will present Router's Low Power Algorithm. And we suggest 'PAN Time'. Device use 'PAN Time' for PAN synchronous. Router using Low Power Algorithm can be enter to inactive status. So Non Beacon Enabled PAN of Router support the low power mode Therefore Router does not receive a power supply always, Router can normal operation.

• Proceedings of the KIPE Conference
• /
• 2016.07a
• /
• pp.351-352
• /
• 2016

Since anti-islanding scheme of grid-connected inverter is a key function of standards compliance, unintentional islanding results in safety hazards, reliability, and many other issues. Therefore, many anti-islanding schemes have been researched, however, existing anti-islanding schemes show poor power quality and non-detection zone issues. Besides, most of them have problems which deteriorate performance of islanding detection under parallel-operation. Therefore, this paper proposes a new anti-islanding scheme that has both negligible power quality degradation, no non-detection zone and precise islanding detection under parallel-operation. Finally, both simulation and experimental results validate the proposed scheme.

• Journal of the Korean institute of surface engineering
• /
• v.29 no.6
• /
• pp.857-861
• /
• 1996

The influence of rf-plasma operation on the thin film formation containing small particles for Al-Li alloys mainly have been studied as a function of Ar gas pressure and plasma power by means of a 200kV transmission electron microscope (TEM). Under the non-plasma operation, the transition from continuous thin films to clusters of grape-like small particles occurred at Ar gas pressures above 20Pa. Particles were single crystals with clear crystal habit planes. Under the plasma operation, the influence of gas pressures on the film formation at a plasma power of 5W was also examined. Thin films containing particles below 30Pa and the films containing mainly particles above 40Pa were formed. The prominent change of the average particle size was not recognized. The increase of the plasma powers at 20Pa, which formed particles under non-plasma, suppressed growth of particles, and homogeneous films containing very small particles were fabricated. The electric conductivity showed slight decrease with an increase of plasma power.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.15 no.2
• /
• pp.485-499
• /
• 2021

Although non-binary low-density parity-check (NB-LDPC) codes have better error-correction capability than that of binary LDPC codes, their decoding complexity is significantly higher. Therefore, it is crucial to reduce the decoding complexity of NB-LDPC while maintaining their error-correction capability to adopt them for various applications. The extended min-sum (EMS) algorithm is widely used for decoding NB-LDPC codes, and it reduces the complexity of check node (CN) operations via message truncation. Herein, we propose a low-cost CN processing method to reduce the complexity of CN operations, which take most of the decoding time. Unlike existing studies on low complexity CN operations, the proposed method employs quick selection algorithm, thereby reducing the hardware complexity and CN operation time. The experimental results show that the proposed selection-based CN operation is more than three times faster and achieves better error-correction performance than the conventional EMS algorithm.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.24 no.2
• /
• pp.151-164
• /
• 2021

With the gradual increase in the ROK naval power, it is an undeniable fact that the time of operation in the ice-infested area will be necessary in the near future. Recently, cases of ice formation around Korean waters in wintertime have been frequently reported. However, in the case of the ROK naval vessels to date, it is a fact that the ice-strengthened perspective has not been considered from the design stage. In this study, the capability of operation in the ice-infested area of the ROK naval vessels, which did not take into account the ice-strengthened design, was reviewed through the evaluation of the vessel's structural integrity in accordance with the sea ice conditions.

• Journal of Korea Water Resources Association
• /
• v.30 no.3
• /
• pp.257-268
• /
• 1997

Reservoir operators and managers need to present a rational basis of determining releases for a flood event. This study divides a forecasted flood hydrograph by two parts on the basis of non-damaging discharge, which consists of one part con,trolled by non-damaging discharge and another controlled by using flood control storage of the reservoir. In case of using flood control storage, a new reservoir operation method. called TRF (Transformed Reservoir Flood) ROM, is suggested for the operating rules during a flood to consider the reservoir security as well as the operational efficiency. This paper presents an application of the methodology to the operation of a single multipurpose reservoir at the Taechong Dam during flood and the results analyzed.alyzed.

• The Research Journal of the Costume Culture
• /
• v.14 no.5
• /
• pp.715-727
• /
• 2006

The purposes of this study are to investigate the job satisfaction, customer satisfaction and revisiting intention to beauty shops, and to examine the difference of the job satisfaction, customer satisfaction, and revisiting intention between franchised and non-franchised beauty shops. Data were obtained via questionnaire, which developed by results of pretest and previous studies, from workers and consumers of beauty shops in Busan. They were analyzed by factor analysis, t-test and regression. The results were as follows; First, the job satisfaction of beauty shops workers was composed of Adaptation, Operation and Instruction. For both of franchised and non-franchised beauty shops, the operation of beauty shops greaty influenced the job satisfaction of workers, and job satisfaction is not significantly different. Second, consumer satisfaction related to services of beauty shops is composed of three factors: Policy, Personal service, and Physical environment. Regardless of shop types, the policy of shop influenced the consumer satisfaction. Consumers' revisiting intentions to beauty shops are influenced by consumer satisfaction. Third, consumers in franchised beauty shops is less likely to be satisfied and to have the intentions to revisit than those of non-franchised beauty shops. Resulted provide some insights to develop strategies for franchised and non-franchised beauty shops. Limitations and future research directions have been discussed.

• Journal of KIISE:Computing Practices and Letters
• /
• v.14 no.6
• /
• pp.599-603
• /
• 2008

Flash memory has its unique characteristics: the write operation is much more costly than the read operation and in-place updating is not allowed. In this paper, we analyze how these characteristics of flash memory affect the performance of clustering and non-clustering in record management, and shows that non-clustering is more suitable in flash memory environment, which does not hold in disk environment. Also, we discuss the problems of the existing non-clustering method, and identify considerable designing factors of record management method in flash memory environment.

• Journal of Korean Academy of Nursing Administration
• /
• v.8 no.1
• /
• pp.123-135
• /
• 2002

Purpose: In this study, the critical pathway for laparoscopic cholecystectomy patients was developed and applied for clinical study. The effectiveness of the critical pathway was analyzed. Method: The subjects with no critical pathway services of this study were 30 laparoscopic cholecystectomy operation patients, who were hospitalized in B General Hospital in Busan from Nov. 28. 2000 to May 2. 2001. The subjects with critical pathway services of this study were 30 laparoscopic cholecystectomy operation patients, who were hospitalized in B General Hospital in Busan from June. 11. 2001 to Oct. 31. 2001. Results: 1. Development for critical pathway Preliminary critical pathway for the laparoscopic cholecystectomy patients was developed though analysis of the reference and 34 case of medical record. The items on the y-axis were assessment, test, treatment, diet, fluid, consult, medication, activity and education and the items on the x-axis were till 3days after operation. The developed critical pathway was applied in clinical field. 2.　Effectiveness of application on developed critical pathwayPost operational complication was not found in neither the critical pathway using Group nor Non-using Group. Hospitalization period mean was 4.63 days for the using Group and 5.93 days for the Non-using Group(P=.001). The mean cost for medical examination and treatment for the using Group was 786,270 won, 117,454 won(12.9%) less than that of the Non-using Group, 903,724 won(P=.000). The degree of satisfaction for the using group was 3.7 points, for the Non-using Group, 3.15 points. The degree of satisfaction for the used Group was 0.55 points higher than that for the Non-using Group and there was a statistically significant difference(P=.000). Concousion: From results of this study, Using the critical pathway in the laparoscopic cholecystectomy operational patients was effective in decreasing the hospitalization period and cost, and increasing the satisfaction about the medical service.

• International Journal of Highway Engineering
• /
• v.20 no.3
• /
• pp.85-92
• /
• 2018

PURPOSES : In this study, analyze the characteristics of IOC indicator 'threshold' which is needed when evaluating the traffic signal operation status with ESPRESSO in various grade road traffic environment of Seoul metropolitan city and derive suggested value to use in field practice. METHODS : Using the computerized database program (Postgresql), we extracted data with regional characteristics (Arterial, Collector road) and temporal characteristics (peak hour, non-peak hour). Analysis of variance and Duncan's validation were performed using statistical analysis program (SPSS) to confirm whether the extracted data contains statistical significance. RESULTS : The analysis period of the main and secondary arterial roads was confirmed to be suitable from 14 days to 60 days. For the arterial, it is suggested to use 20 km/h as the critical speed for PM peak hour and weekly non peak hour. It is suggested to use 25 km/h as the critical speed for AM peak hour and night non peak hour. As for the collector road, it is suggested to use 20 km/h as the critical speed for PM peak hour and weekly non peak hour. It is suggested to use 30 km/h as the critical speed for AM peak hour and night non peak hour. CONCLUSIONS : It is meaningful from a methodological point of view that it is possible to make a reasonable comparative analysis on the signal intersection pre-post analysis when the signal operation DB is renewed by breaking the existing traffic signal operation evaluation method.