• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.6A
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• pp.600-607
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• 2007

In this paper, we propose a MLKA (Multi-Level Keep-Alive) algorithm based on PRCG (Periodic In this paper, we propose a MLKA (Multi-Level Keep-Alive) algorithm based on PRCG (Periodic Ranging Code Group), in which periodic ranging codes are divided into groups. The AP (Access Point) performs this algorithm when a periodic ranging code arrives at the AP in a WiBro (Wireless Broadband Internet) system. In order to increase the traffic radio bandwidth resource efficiency in this system, we propose the multi-level keep-alive algorithm for finding abnormal AT (Access Terminal). From simulation results, it is verified our proposed MLKA algorithm based on PRCG can provide higher traffic radio resource efficiency compared to message-driven keep-alive algorithms.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.3B
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• pp.231-239
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• 2011

This paper reviews the recent theoretical and empirical studies on the European countries that the bill and keep settlement between mobile operators is superior to the financial settlement like CPNP from the perspectives of social welfare and fare competition in market. Besides these the recent studies, considering the change of mobile wholesale market in Korea, the necessity to introduce the bill and keep settlement as an alternative for the current CPNP as well as policy implication is examined.

• Journal of Korean Clinical Nursing Research
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• v.20 no.1
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• pp.15-27
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• 2014

Purpose: The purpose of this study was to identify nurse's intention to keep current job in the hospital. Methods: Data were collected from 1,143 nurse's working in over 300 beds hospital. The questionnaire with 47 items was developed by researchers to measure nurse's intention to keep his/her current nursing job in hospital. The questionnaire was developed through a focus group interview asking nurse's about their work experiences and literature review, and validated by researchers. Using descriptive statistics, data were analyzed in frequency and severity of nurse's intention to keep nursing job. The Cronbach's ${\alpha}$ of the questionnaire was .906. Results: The mean score of nurse's intention to keep current nursing job was 2.66. The highest mean scores of item of nurse's intention to keep nursing job was "as a nurse it is my duty to help others" ($3.19{\pm}0.45$), and the lowest was "the rotating shift helps me doing housework and raise for my kids" ($1.77{\pm}0.64$). And there are significant differences between period of working (F=9.71, p<.001), current position (F=5.91, p<.001), educational level (F=13.44, p<.001), and impulse experience of changing a job (F=71.20, p<.001). Conclusion: The findings of this study showed possibilities to develop programs for heightening the pride of professional nurse and increasing nurse's intention to keep nursing job in order to increase nurse's professional satisfaction and achievement.

• Korean Journal of Human Ecology
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• v.23 no.3
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• pp.421-441
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• 2014

This study investigates the influence of policy-related factors on the intention to keep working among mothers with children under 12 years old, especially focusing on the differences between the mothers with preschool children and elementary school children. The study also considers the individual, family, job characteristics of mothers with children, in order to draw the specific impact of policy factors. Data was collected through e-mails from 500 working mothers living in urban area, and 489 interview data were finally utilized in analyses. The results of analyses show that the level of awareness on work-family balancing policy significantly influences on the intention to keep working among mothers with preschool children. On the contrary, there is no statistically significant policy-related factors influencing on the intention to keep working among mothers with elementary school children. Both studies and social polices excessively focused on the mothers with preschool children in terms of work-family balancing issues. Working mothers with elementary school children have not been spot-lighted as beneficiaries from social policy, even though elementary school children also should be cared by others after school. Effective social services assisting work-family balance among mothers with preschool children should be more developed.

• The Journal of Korea Robotics Society
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• v.6 no.4
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• pp.317-322
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• 2011

An augmented state feedback controller for a Wheeled Inverted Pendulum (WIP) is proposed in this research. The augmented state feedback controller is able to keep the WIP returning to the origin. Generally, the WIP has both stable and unstable equilibrium points. To keep the WIP over the unstable equilibrium point, the WIP consistently is being controlled. A simple state feedback controller is letting the WIP out of the origin when the center of gravity of the WIP locates out of the schematic center line. In some case of applications, it may not be desirable that the WIP is drifting out of the initial location. The proposed augmented state feedback controller is able to keep the WIP at the initial location whether its center of gravity lies out of the center line or not. Numerical simulations are carried out to show the validation of the augmented sated feedback controller.

• 제어로봇시스템학회:학술대회논문집
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• 2004.08a
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• pp.722-725
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• 2004

In most manufacturing systems, all customers are expected to take deliveries from inventory. However, in some situations, management may keep inventory only for some customers and not keep inventory for the others. The reason is that they would like to make as much benefit as possible from the first group of customers and this may help sell these customers on further products. This paper attempts to determine the cutoff between the group of customers who are given products immediately when their orders come and other customers who will be served but have to wait for the production of their products. The optimum set of customers to be served immediately and the optimum set of customers who have to wait for the production are found using linear programming to optimize perceived manufacturer benefits measured as the product of the benefit factor and the corresponding profit per customer. The results indicate that it is not necessarily wise to keep inventory for all customers.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.05a
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• pp.446-449
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• 2002

Quadruped walking robot requires dynamic control to keep its stability in high speed walking. To keep its walking stability by control of only legs' Joint angle lowers energy efficiency. It is known that an animal or a human use the moving of the mass center of one's upper body to keep the stability. We have developed a quadruped walking robot with weight balancing oscillator that have high energy efficiency. In this study, walking tests are performed for the robot to verify the validity of the weight balancing oscillator.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.58 no.1
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• pp.48-55
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• 2009

In order to keep safe driving conditions under road networks, there are several formations such as road structure, road surface condition, traffic occupancy and supplement of an accurate information of traffic status ahead To support safe-driving on each road formation, each formation is supplied with various information to help the driver. However, in some cases like rapid status change at local-scale geography, traffic information systems often displays insufficient information because of the lack of information correlation. In order to accurately aware the driver, all road formation must be in sync. It is important to supply accurate information to the driver because this information directly impacts the drivers on the road. This paper discusses the amber information to keep the least safety driving over road formations including tunnels and bridges. This paper also will propose the informations for safe-driving conditions, information linkage on the road and rule-base safety information, as ITS technology, being displayed for all drivers under the worst weather conditions.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.927-930
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• 2008

Recently, the scale and form of the construction promoting in government and private organization have large scaled town. The underground area of whole town are used for every facilities, and most of concrete area are used for greening part for friendly environment construction. This greening part for concrete area have good point such as being amendment and various economical effect and improvement for environmental problem, moreover, the amount of greening part become great increased. For this factor, we have to newly consider to keep durable safety for concrete structure, therefore, we suggest that how to keep structural safety of greening area on the concrete.

• Journal of Korean society of Dental Hygiene
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• v.8 no.3
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• pp.85-98
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• 2008

This study is to enforce to ready basic data of effective dental education program and no smoking and no drinking program for high school students who do smoking and drinking, executed investigation by own recording way using smoking and questionnaire consisted of actual conditions and caries prevention awareness and dental health knowledge degree of drinking to some man high school. Analyzes result that total 487 people respond in SPSS WIN 13.0 programs and got following sequence. Result of this study is as following. 1. Mans high school students had more students who do not than a drinking student and main current received most soju. Third-year student appeared by thing which receive a lot of soju than 1 or 2 class student but different other difference was not seen by class. 2. Mans high school students had more students who do not than a smoking student and a student who smoke more than 3 years was the most. I can know was old since third-year student smokes than 1 or 2 class student. 3. It was not difference that keep in mind by drinking, smoking availability although there were many students who recognize that all of the on-time dental medical examination, sugar intake limitation, fluorine inclusion toothpaste, teeth fluorine application are seldom effective on caries prevention. 4. Recognized that right brushing is effective relatively on caries prevention. I was shown difference that recognized that righter brushing is effective on bad tooth courtesy call than a student who a student who do not smoke does, and keeps in mind according to smoking availability ($x^2$=6.78, p<0.05). 5. I knew best about question of 'A caries may not treat if is painless' among that question ask knowledge for a caries, and appeared by thing which do not know best about question of 'Know that method that supply fluorine in water'. 6. A student who do not drink general dental know-how for a caries was high knowledge degree for a caries than a drunk student but it was no difference that keep in mind by drinking availability. Also, a student who do not smoke by smoking availability was high knowledge degree for a caries than a done student but difference that keep in mind statistically was not seen. 7. It was no difference that keep in mind by drinking availability, but a student who do not smoke by smoking availability was high relation knowledge degree with food and a caries than a smoked student, and I was shown difference that keep in mind according to smoking availability(t=-2.03, p<0.05). 8. Awareness and synthetic estimation degree of knowledge degree a student who do not smoke than a smoked student mouth knowledge degree high, and I was shown difference that keep in mind according to smoking availability(t=-2.03, p<0.05). When see as result such as singularity, family, school, all social institutions may have to help by national business coming and try so that can become national business based on special know-how for development of effective and epoch-making education program as quickly as possible.