• Journal of the Korea Society for Simulation
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• v.24 no.4
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• pp.153-161
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• 2015

We propose a privacy-preserving location-based service (LBS) which supports top-k search service. The previous schemes hurt the privacy of either the user and the location of the objects because they are sent to the LBS server in a plaintext form. In the proposed method, by encrypting them with the fully-homomorphic encryption, we achieved the top-k search is possible while the information on them is not given to the LBS server. We performed a simulation on the proposed scheme with 16 locations where k is 3. The required time is 270 hours in a conventional desktop machine, which seems infeasible to be used in practice. However, as the progress of the hardware, the performance will be improved.

• Journal of the Korea Convergence Society
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• v.8 no.3
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• pp.283-294
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• 2017

This study developed and proposed a cosmetics education program for middle school students for the free semester policy. The program was conducted for 20 sessions, two hours per week, based on theories and practice, and the teaching-leaning plan was made in the order of introduction, development, and summary. Through the program, students will have an opportunity to recognize the problems of misusing cosmetics and importance of the skin. Also, the program was developed in a way that encourages students to actively participate in the education so that it can lead to career development in the social and technical aspects. This study can provide basic data for students to acquire knowledge and practical education related to skincare and cosmetics use in the future.

• Journal of the Korean School Mathematics Society
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• v.10 no.4
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• pp.557-571
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• 2007

The purpose of this paper was to develope a model for enhancement of mathematics education using participatory mathematics. Traditionally, mathematics has been considered ready-made and students need to practice it without real applications of mathematics. The 6th grade students in the two classrooms participated in the 60 class hours and the researcher and observers investigated students' achievements and reactions. In this model, students actively apply mathematics to real-life problems and futhermore change our life, which is one of the unique elements. Thus, students can experience mathematical power while they do mathematics. Every student need to experience with this model several times in a semester so that he or she can be active a citizen to change society a better place.

• Perspectives in Nursing Science
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• v.9 no.2
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• pp.127-135
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• 2012

Purpose: The purpose of this study was to investigate the academic achievements, satisfaction and educational demands of nursing students at a college of nursing. Methods: The study subjects consisted of 134 senior nursing students who completed their clinical practicums. The students were asked to complete the evaluation survey for the curriculum. The evaluation survey for the curriculum consisted of three parts: 1) academic achievements of educational objectives, care of subjects, and skills; 2) satisfaction with the curriculum, clinical practice environment, and educational environment; 3) demands on the curriculum and clinical practicum. Results: The mean scores on the achievement levels of educational objectives, care of subjects and skills of the students were $3.68{\pm}0.53$, $3.69{\pm}0.59$, and $3.77{\pm}0.56$, respectively. The low rated domains were 'understanding and delivering culturally competent nursing' and 'competence in fundamental nursing skills' in their levels of achievements. Overall, students were satisfied with the nursing curriculum and educational environment. However, their satisfaction scores for the hours and arrangements of the clinical practicum, and the ratios and arrangements of lectures and clinical practicum were relatively low. Conclusion: The findings of this study are important to redesign nursing curriculum in order to prepare graduates for rapidly changing health care environments. We need to try various strategies to improve the clinical competencies of students by designing a curriculum based on social change and student needs.

• Journal of the Korean Society for Railway
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• v.18 no.2
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• pp.111-116
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• 2015

LED luminaires as a lighting system have attracted much research attention due to their high efficiency and long lifetimes. However, disappointing outcomes have been noted in terms of performance levels and lifetimes as compared to desired system requirements in practice due to certain electrical and thermal characteristics of LEDs. LM-80 and TM-21 established by IESNA are the best known standards for lifetime test procedures and estimation techniques. However, they only handle LED light sources without guaranteeing the LED luminaire in a reliability test. They also operate for more than 6,000 hours and undergo various stresses, such as the operating current and temperature. Therefore, a lifetime standard for LED luminaires has not yet been established. This paper proposes a conceptual design of a lifetime test system for LED headlamps depending on the operating environment. Eventually, this method can assist with evaluations of the validity of lifetime standard tests of LED headlamps.

• Korean Journal of Health Education and Promotion
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• v.19 no.2
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• pp.155-167
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• 2002

This study was carried out to grasp visiting nurses' perception of the service referral between health and welfare with a view to providing the basic data for the visiting nursing activities. A questionnaire survey was conducted on public health nurses in 25 health centers in Seoul from Feb. 12, 2001 to Mar. 15, 2001. A total of 151 questionnaires were collected and they were analysed by use of SPSS/WIN 7.5. The results of the survey are as follows. 1. In general, visiting nurses were burdened with heavy workloads. On average, a visiting nurse covered 5 ‘dong's(the smallest administrative unit), 564 households, and 1223 persons. They spent almost a quarter of their working hours moving from home to home and recording the charts after home visiting. They took 30-60 minutes to provide their services when visiting homes. As for the frequency of home visiting, they were following the instructions recommended by the government. However, their services were still wasteful, not skill-oriented, in that they spent more time assessing ‘subjects’ rather than providing their ‘services’ for them. 2. As for the degree of service performance, visiting nurses scored average 2.94 and 2.28 on the four-point scale in the area of health and welfare respectively. The Pearson coefficient between the two variables was high(.56). According as the health services increased, the welfare services increased as well, which showed that the service referral between the two areas should be essential. 3. ‘The necessity of cooperation with social welfare staff’ scored average 4.49, and ‘the degree of cooperation with social welfare staff’ scored average 3.16 on the five-point scale; There was a statistically significant difference (average 1.33) between the two variables. Such a big difference between perception and practice results from the lack of political support that connects the two service areas comprehensively. Therefore it is recommendable to establish a so-called ‘Visiting Nursing Center’ in the ‘dong’ office in order to provide integrated services of health and welfare at once in cooperation with social welfare staff. That's the way to meet the public needs directly and it's more efficient as well in terms of cost-saving.

• Health Policy and Management
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• v.2 no.2
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• pp.57-89
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• 1992

This study is aimed both to reorient the Health net-works focused to Health Subcenters in times of development of local autonomy in Korea and to collect the fundamental data such as attitude and practice of the directors of Health Subcenter. The materials are collected from 134 out of 258 sampling directors of Health Subcenters with a questionaire by mailing(respond rate 51.9%). The major findings of this fundamental data are as follows. 1. Current average number of outpatients cared by a director of Health Subcenter is found to be 21.6. 2. The directors of Health Subcenter have little deducted hours for Public Health Programme. 3. Number of the Preventive Health Programme worked by a director of Health Subcenter is from 0 to 3. The most major group worked only 1 programme marked at 69.4%. 4. The directors of Health Subcenter express approval opinin marked at 80.2% that their qualification to appoint has to finish intern course. 5. The average diagnosis allowance a month is approximately twenty hundred thousand won. 6. Most of Health Subcenter(market at 94%) adopted a self-supporting account system. 7. The most complaining subject of directors of Health Subcenter is their working environment. The second complaining subject is governmental officier's interference. 8. The average number of outpatients cared by a director of Health Subcenter is found to be certain differentials by their marriage and the duration of employment. Some proposals of development on Health Subcenter based on the result of this research is as follows : 1. The reorganization on Health Subcenter under line of National Health Center Net-work 2. The psychological reorientation of directors of Health Sucenter and officers. 3. Autonomy management of Health Subcenter. 4. Reorientation of status on directors of Health Subcenter.

• Journal of Gifted/Talented Education
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• v.12 no.2
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• pp.93-125
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• 2002

The purpose of this study is to identify the characteristics of the teachers of the gifted and to identify present status of the training and employment system of the teachers of the gifted in Korea. The characteristics of the teachers of the gifted were explained in three areas of philosophical understanding, experts' characteristics, and personal characteristics. This paper presented several suggestions to improve a system of employment and training of teachers of the gifted in Korea, and they were as follows: - To enhance the quality of training program. The training program should include various activities, for example, discussion, field trip, making a product, seminar, workshop, practice in various teaching models, etc., to foster creative and higher-order thinking abilities. - To prepare various kinds of training programs in consideration of various teachers' needs. - To provide a training successively. The 60 hours' training is not sufficient to be a good and effective teacher of the gifted. Successive training is needed. - To prepare various incentives which make many competent teachers to take part in gifted education. - To improve process to select and to employ the teacher of the gifted. Many teachers want an more open and strict scrutiny process to select and employ the teachers of the gifted.

• Restorative Dentistry and Endodontics
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• v.21 no.2
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• pp.628-634
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• 1996

The purpose of this study was to investigate the effect of moisture on apical sealing properties of root canal. Fifty five single rooted human teeth were selected from maxillary and mandibular teeth. After removing crown portion at the cemento-enamel junction, all teeth were routinely prepared with step-back method. And then, the canals were dried with paper point and the teeth were randomly divided into 3 groups of 15 teeth each, and remaining 10 teeth were used as positive and negative control teeth : Group 1 were irrigated with 1ml of 95% alcohol and dried with air and paper point. Group 2 and 3 were intentionally contaminated with 0.05ml of 3.5% NaOCl or saliva, respectively. All the teeth were obturated with sealapex and gutta percha cone by lateral condensation technique, and covered with two coat of nail varnish after 48 hours of obturation. The teeth were immersed in india ink for 1 week and cleaned with methyl salicylate and then the degree of dye penetration were measured with stereomicroscope. The data were analyzed statistically by one-way ANOVA. The results were as follows : 1. All experimental groups showed varying degrees of dye penetration, and the mean degree of dye penetration was 0.1mm to 0.7mm. 2. Saliva contamination group(group 3) showed the highest amount of dye penetration, followed by NaOCl contamination group, then alcohol dried group, but there was no significant difference among three experimental groups. * This results suggest that there was no significant differences of apical leakage after canal obturation between alcohol dried canal and moisture present canals and the use of alcohol instead of paper point is unnecessary to dry the canals prior to canal filling. But other factors such as bacterial contamination and sealer discoloration by moisture must be considered in application of this results to clinical practice.

• Journal of Korean Neurosurgical Society
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• v.60 no.4
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• pp.397-403
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• 2017

Objective : Cranioplasty using a cryopreserved skull flap is a wide spread practice. The most well-known complications of cranioplasty are postoperative surgical infections and bone flap resorption. In order to find biological evidence of cryopreserved cranioplasty, we investigated microorganism contamination of cryopreserved skulls and cultured osteoblasts from cryopreserved skulls. Methods : Cryopreserved skull flaps of expired patients stored in a bone bank were used. Cryopreserved skulls were packaged in a plastic bag and wrapped with cotton cloth twice. After being crushed by a hammer, cancellous bone between the inner and outer table was obtained. The cancellous bone chips were thawed in a water bath of $30^{\circ}C$ rapidly. After this, osteoblast culture and general microorganism culture were executed. Osteoblast cultures were done for 3 weeks. Microorganism cultures were done for 72 hours. Results : A total of 47 cryopreserved skull flaps obtained from craniectomy was enrolled. Of the sample, 11 people were women, and the average age of patients was 55.8 years. Twenty four people had traumatic brain injuries, and 23 people had vascular diseases. Among the patients with traumatic brain injuries, two had fracture compound comminuted depressed. The duration of cryopreservation was, on average, 83.2 months (9 to 161 months). No cultured osteoblast was observed. No microorganisms were cultured. Conclusion : In this study, neither microorganisms nor osteoblasts were cultured. The biological validity of cryopreserved skulls cranioplasty was considered low. However, the usage of cryopreserved skulls for cranioplasty is worthy of further investigation in the aspect of cost-effectiveness and risk-benefit of post-cranioplasty infection.