• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2008.05a
• /
• pp.616-619
• /
• 2008

In this paper, we design and implement the authentication system for home network service and applied it to actual sensor nodes. We achieved authentication key, encryption and decryption applied RC5 encryption algorithm of SNEP. In addition, we used pair-wise key pre-distribution for prevention of authentication sniffing in wireless sensor network. The experiment environment consists of a base station receiving data and sensor nodes sending data. Each sensor nodes sends both the data and encrypted authentication key to the base station. As a simulation environment, we assumed some what-if scenarios of security menaces in home network service. And we slightly altered the TOS_Msg construction of TinyOS. The experiences had shown that the malfunction doesn't happen in communication among other groups. And we confirmed in tests that the system is secure when a sensor having malicious propose is added.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.28 no.1
• /
• pp.143-152
• /
• 2010

These days, we can't confirm cadastre information about stereoscopic digital map that was consist of 2 dimensions and more difficult to understand of detailed parcel boundary, area, land using for 3 dimensions. An each local government providing three-dimensional that are connected to an aerial photograph with cadastre maps. Satisfaction is high for citizens but, this service additional cost for purchase of an aerial photograph order to provide of it. So far, in various ways are under study about three dimensions using Google Earth which is possible to provides 3 dimensional information by real time for individual parcel situation. The purpose of this study was analyzed an accuracy of overlapping between cadstre maps and an image on Google Earth Web in the each different coordinates system. Also, this paper could be provided for use possibility of 3 dimensions information service with an indicator of using or a guideline of direction for local government which provide 3 dimensions information oneday.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.10 no.5
• /
• pp.14-22
• /
• 2011

This study is to estimate delay time model of signalized intersection by using travel data of Bus Information System. BIS, which applies the advanced information technology to an existing bus system, has been developing and operating in many cities. However, even though some useful traffic informations have been collected from BIS operation, utilization of real-time data to the traffic operation has not been promoted due to the inhomogeneity of modal speeds. Accordingly, in this study, a fundamental research is performed for traffic controls in urban areas and providing a traffic information throughout a methodology for estimating delay time using the data from BIS was developed. This delay time model setting bus travel time excluding service time of a bus stop as explanatory variables was constructed as a regression model, and the coefficient of determination of a linear regression model most highly appeared as 0.826. As a result of performing T-test with field survey values and model estimation values for verifying constructed models statistically, it was analyzed to be statistically significant in a confidence level of 95%.

• Journal of KIISE:Computing Practices and Letters
• /
• v.6 no.4
• /
• pp.411-420
• /
• 2000

The performance of soft handoffs of CDMA mobile communication systems is potentially determined by several factors such as handoff-related system parameters (T_ADD, T_DROP, T_COMP, T_TDROP), mobile stations' mobility, service areas, capacity of base stations. Due to the importance of handoffs in mobile communications, several methods have been proposed and tested through computer simulations to prove the efficiency of proposed methods. Different assumptions on the above mentioned factors often produce different simulation results. Therefore, the credibility of a simulation result is directly determined by the objectivity of the assumptions made by the simulation. This paper proposes a new soft handoff method that controls handoff delay time based on a mobile station's speed, and compares it with the current method of CDMA systems. The simulation results showed that the new method is much more efficient for mobile stations that are free in their moving direction and space than for those restricted in their moving direction and space. In addition, the results showed that even the same handoff method may produces different simulation results depending on whether a service area is modeled as two-dimensional space or three-dimensional space. These results indicate the importance of suitable models of user mobility, especially the movement types and space allowed for mobile stations, which have been neglected in simulation studies of mobile communications.

• 한국노년학
• /
• v.38 no.1
• /
• pp.15-26
• /
• 2018

This study was aimed to investigate the influencing level of nursing staff's recognition for the health care accreditation on patient safety managing activities by identifying the relationship between them and other factors affecting on patient safety managing activities. Subjects of this study were 182 nursing staffs working in six geriatric hospitals accredited for health care in Seoul metropolitan area. Data was collected during April, 2016 by structured questionnaires. And SPSS/WIN 15.0 program with t-test, ANOVA, Pearson's correlation, and stepwise multiple regression analysis were employed for analyzing them. 96.2% of the subjects have recognized the accreditation and 31.8% of them have acknowledge it in detail. The average level of recognition for the health care accreditation and patient safety managing activity were 3.60 and 4.39 point (max.5.0) respectively. Correlation between them was positive(r=.339, p<.001). Significant factors influencing patient safety managing activity were internal service quality promotion (t=5.292, p<.001) and academic background (t=2.836, p=.005). Education program or information on health care accreditation system, and action plans for promoting internal service quality for the nursing staffs including job standardization of the jobs are recommended for the better patient safety managing activities.

• The Journal of the Korea Contents Association
• /
• v.12 no.9
• /
• pp.447-458
• /
• 2012

The purpose of this study is to investigate the influence of benefit sought and service quality of the travel show visitors who are used as advertisements of tourism companies due to increase of tourism on the behavioral intentions and to use as a useful information to plan travel show. For this study, 240 visitors from Hanatour International Travel Show are selected. And 203 valid questionnaires are analyzed. With collected materials, SPSS 17.0, AMOS 7.0 program was used to verify research problems. As a result, travel show visitors' benefit sought don't have any influence on the behavioral intentions to revisit and to recommend. Second, travel show visitors' service quality have a positive influence on the behavioral intentions to revisit and to recommend. Thus travel show host should try hard to make travel show be an important tourism resource by continuous improvement of service quality.

• Journal of Korean Academy of Nursing
• /
• v.21 no.3
• /
• pp.383-395
• /
• 1991

This study was to investigated the factors influencing the decisions of nurses to resign. The purpose was to contribute information useful for the effective management of nurse staffing resources. The specific objectives were as follows : 1. To investigate the level of job satisfaction of nurses who resign. 2. To analyze the relationship of job expectations and the decisions to resign. 3. To investigate the major reason for nurses' resignations. 4. To identify the relationship of the general characteristics of the nurses and the factors influencing their decisions to resign. 5. To analyze the relationship of the intention to resign and the factors influencing the decisions to resign. The sample consisted of 90 nurses who worked at Y hospital in Seoul from march. 1987 to Feb. 1988 and who had resigned. The instruments used for this study were slavitt et al's Index of Work Satisfaction Scale and a job expectations scale developed by the researcher Analysis of data was done using frequency, t-test and ANOVA. The results of study were as follows : 1. There was no difference in the job satisfaction level of nurses who resigned compared with nurses in active service but the subcategory interaction score was lower and the subcategory salary score was higher than for nurses in active service. 2. Low job expectation scores influenced the decision to resign. 3. The major reason for resigning were personal problems such as marriage, childbirth, and relocation of family. 4. The length of employment and the number of different service areas of the nurses who resigned were associated with the job satisfaction level. 5. The nurses who had have an intention to resign while in active service had lower scores for job satisfaction and the job expectation score was a greater influence on the decision to resign. In conclusion, the factors influencing the decisions of nurse to resign were job satisfaction, job expectations and intention to resign while still in active service.

• Journal of Korean Dental Science
• /
• v.16 no.2
• /
• pp.192-203
• /
• 2023

Purpose: This study is to investigate the distribution of natural tooth shades in the Korean elderly population to quantify the correlation and changes of tooth color with age and gender. In addition, the possible effects of habits on tooth color were assessed. Materials and Methods: The tooth color of one of the maxillary central incisors of 200 Korean individuals aged 50 to 89 years, males and female, was measured using the portable intraoral spectrophotometer (VITA Easyshade V). CIELab and CIELCh color coordinates were recorded. We conducted the survey about the tobacco smoking, chronic disease, medication, eating habits, oral health behaviors and satisfaction with tooth color. Experimental data were statistically analyzed by using the t-test (P<0.05), two-way analysis of variance and Pearson's correlation test. Result: The most frequent color in the Korean elderly population was 3M3 & A3.5 shade. L^* and h^* values decreased, whereas C^*, a^* and b^* values increased progressively with age. There was a significant interaction between age and color coordinates for b^* values (r=0.245, P<0.05). Males generally have significantly higher C^*, a^*, b^* values and lower L^*, h^* value compared to females. Individuals who consumed alcohol had a higher L^* value (P<0.05). Conclusion: Within the limitation of this study, the central incisors were getting darker, more reddish, and yellowish with age. Information on the chromatic range of natural teeth by age and gender could help to select colors for esthetic dental restorations.

• Journal of KIISE
• /
• v.42 no.10
• /
• pp.1268-1279
• /
• 2015

In order to manage a large number of devices connected to the Internet of Things (IoT), the Internet Engineering Task Force (IETF) proposed the IPv6 Routing Protocol for Low Power and Lossy Networks (RPL). The route of the RPL network is generated through the use of an Objective Function (OF) that is suitable for the service that is required for the IoT network. Since the route of the RPL network is conventionally simply chosen only by considering the link quality between the nodes, it is sensible to seek an OF that can also provide better Quality of Service (QoS). In previous studies, the end-to-end delay might possibly be sub-optimal because they only deal with problems related to the reduction of energy consumption and not to the link quality on the path to the sink node. In this study, we propose a scheme that reduces the end-to-end delay but also gives full consideration to both the quality on the entire route to the destination and to the expected lifetime of nodes with bottlenecks from heaped traffic. Weighting factors for the proposed scheme are chosen by experiments and the proposed scheme can reduce the end-to-end delay and the energy consumption of previous studies by 20.8% and 10.5%, respectively.

• Journal of Korean Biological Nursing Science
• /
• v.18 no.4
• /
• pp.280-287
• /
• 2016

Purpose: This study was to evaluate the effects of information on anxiety, blood pressure and pulse in cerebral angiography clients. Methods: The data were collected from June to November 2014. The participants were 42 (21 each for experimental and control group) patients who to received cerebral angiography. The information developed from researchers' materials for cerebral angiography was provided only to experimental group. Measured variables were anxiety, systolic and diastolic blood pressure, and pulse rate. Research tools for anxiety were Spielberger's state anxiety inventory, and 10 point visual analogue scale (VAS). Results: The difference in mean systolic blood pressure after intervention between the experimental group ($129{\pm}15.34$) and the control group ($141{\pm}17.70$) was statistically significant (t=-2.28, p=.028). The differences between the two groups in state anxiety, VAS anxiety, diastolic blood pressure, and pulse rate after intervention were not statistically significant (p>.05). Conclusion: The information using educational material was effective in to decreasing systolic blood pressure in patients who received cerebral angiography. Therefore this study material could be used as a nursing intervention for patients in cerebral angiography.