• Korean Journal of Community Nutrition
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• v.8 no.6
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• pp.919-926
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• 2003

The purpose of this study is to examine the current congregate meal service program for homebound elderly. One hundred three meal service centers in charge of the congregate meal service programs as part of the elderly foodservice program were surveyed for administrative structure, menu management, food purchasing and production management, hygiene, equipment, and facilities. Statistical data analyses were completed using the SAS 8.1 program for descriptive analysis and ANOVA. The meal cost of 54.4% of the congregate meal service centers ranged from ￦l,500 to ￦l,999 per meal. According to the menu analysis, all nutrients except calcium and Vitamin B2 were at levels of more than 33% of the Recommended Dietary Allowances for Koreans. A total of 81.5% of the centers were operated without the services of a dietitian, and food purchasing, menu planning and other foodservice management processes were handled by non-professionals, such as volunteers, cooks or social workers. Although 88.3% of the centers required a therapeutic diet menu for the health of the elderly, most directors (77.6%) replied that in their current status they could not afford to serve therapeutic diets. These results suggest that financial and systematic supports by government is very necessary. Fifty-five percent of the centers never used standard recipes. For determining portion sizes, 93.2% of the congregate meal service centers depended on the personal experience of the personnel. Finally, the current congregate meal services for the homebound elderly were not operated systematically. To improve the elderly food service program, it is strong1y recommended that it be managed by Professionals.

• Imaging Science in Dentistry
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• v.48 no.2
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• pp.103-109
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• 2018

Purpose: To analyze cone-beam computed tomography (CBCT) use, indications, and exposure parameters in San $Jos{\acute{e}}$, Costa Rica. Materials and Methods: A cross-sectional study was performed. All CBCT examinations over a period of 6 months at 2 radiological centers in San $Jos{\acute{e}}$, Costa Rica were evaluated. The examinations were performed with Veraview EPOC X550 and Veraviewepocs 3D R100 equipment. The patients' age and sex, clinical indication for CBCT, region of interest (ROI), repeat examinations, specialty of the referring dentist, field-of-view (FOV), tube voltage (kV), tube current (mA), and radiation dose (${\mu}Gy$) were evaluated. Patients were classified by age as children (${\leq}12years$), adolescents(13-18 years), and adults(${\geq}19years$). Results: The mean age of the 526 patients was 49.4 years. The main indications were implant dentistry and dental trauma. The most frequent ROIs were posterior, while anterior ROIs were much less common. The highest percentage of repeat examinations was in children. Fifty-six percent of the referring dentists were specialists. The most commonly used FOV was small. The mean tube voltage and current were 79.8 kV and 7.4 mA for Veraview EPOC X550 and 89.9 kV and 6 mA for Veraviewepocs 3D R100, respectively. The mean doses for children, adolescents, and adults were $6.9{\mu}Gy$, $8.4{\mu}Gy$, and $7.8{\mu}Gy$, respectively. Conclusion: Although CBCT was most commonly used in adults for implant dentistry, most repeat examinations were in children, and the highest mean dose was in adolescents. Additional dose optimization efforts should be made by introducing low-dose protocols for children and adolescents.

• Journal of the Korean Dietetic Association
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• v.7 no.2
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• pp.167-174
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• 2001

The purpose of this study was to investigate food service management system and nutrition education of the early childhood education institute in Yongdungpo, Seoul. Self-administered questionnaires were completed by 26 public early childhood education institute and 34 private ones. A majority of the teachers were women over 40 with at least bachelor's degree. Other than the fact that food service provides food to the children, it contributed in providing the essential nutrients to the children, as well as giving them the opportunity to learn table manners. A normal food service would provide one set of lunch and two sets of snacks, which would be provided by the institute itself. In most cases, the director or teachers planned the menus instead of dietitians. Journals, cookbooks, and other information put out by mass communication, such as TV and newspapers, were used as reference to those menus. The factors considered in planning the menus were mainly nutritional balance and the children's food preference. The difficulties in meal management were about the budget and nutritional menu planning. Fifty five percent of the subjects were did nutrition education, and they focused mainly on the table manners and hygiene education but once a year. The difficulties and complaints in execution nutrition education at the institutes were lack of nutritional knowledge, personal shortage, and excessive work. The institutes were urgently requesting for menu provisions from local Public Health Clinics. As a recommendation from the results of this study, food service management and nutrition related subjects should be more enforced into the nursery teacher training curriculum. Also, it is necessary to provide nutrition education to teachers, and as a link, the need to develop a manual for nutrition education has become urgent.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.39
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• pp.21.1-21.6
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• 2017

Background: The purposes of the present study were to compare implant stabilities of mandibular block bone graft and bovine bone graft and to evaluate influencing factors for implant stability in mandibular block bone (MBB) graft. Methods: This retrospective study investigated 1224 cases and 389 patients treated by one surgeon in the Department of Oral and Maxillofacial Surgery of Pusan National University Dental Hospital (Yangsan, Korea) between January 2010 and December 2014. Proportions that MBB graft cases constitute in all implant restoration cases and in all bone graft cases were measured. Implant stability quotient (ISQ) values were achieved by the same surgeon before loading. The average ISQ values of the experimental groups were compared. In addition, ISQ values of influencing factors, such as age, sex, implant size, and implant placement site, were compared within the MBB group using $Osstell^{TM}$ Mentor ($Osstell^{(R)}$, $G{\ddot{o}}teborg$, Sweden). Paired t test and ANOVA were conducted for statistical analysis with a significance level of 0.05. Results: Fifty-five percent of all implant restoration cases performed bone graft while MBB cases constituted 34% of all implant restoration cases and 61% of all bone graft cases. Comparing ISQ values according to bone graft materials, the MBB group manifested sufficient implant stability by presenting comparable ISQ value to that of the experimental group without bone graft. Among the reviewed factors, females, mandibular molar regions, and implants in larger diameter displayed greater implant stabilities. Conclusions: Satisfactory implant stability was accomplished upon administration of MBB graft. Within the limitation of this study, gender, implant site, and implant diameter were speculated to influence on implant stability in MBB graft.

• Journal of Korean Academy of Nursing Administration
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• v.15 no.2
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• pp.193-202
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• 2009

Objective: The purpose of this study was to compare preceptors and new graduate nurses on their perception of preceptor teaching effectiveness. Methods: The participants were 90 new nurses and 90 preceptors who worked in A medical center. The data were collected from July 1 to September 30, 2008. A cross-sectional descriptive survey was done using a structured questionnaire. Results: New nurses' perception ($4.07{\pm}.44$) of the preceptor teaching effectiveness was significantly higher than perception of the preceptors ($3.57{\pm}.37$). Fifty five percent of new graduate nurses reported a lack of coherence in the preceptor's practice guidelines. For 5 causal factors classified on the teaching effectiveness, the factor of 'Professional knowledge and ability' showed the highest score, but 'Interpersonal and communication skill' got lowest score for both group. Preceptors responded that they did not have enough time to teach well because of their heavy workloads. Conclusions: These results suggest that the preceptors need appropriate compensation and education opportunities, and new graduate nurses need consistent education by the teaching professionals. Therefore, it is important to give preceptors full charge of the preceptorship. Also, it will be necessary to develop education programs to enhance interpersonal and communication skill for preceptors and new nurses.

• The Journal of the Acoustical Society of Korea
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• v.16 no.2
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• pp.10-15
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• 1997

The hydrophones is mounted in many applications on a vibrating surface and functions as an underwater acoustic signal receiver without sensing the vibrations from the mounting surface. However, their performance is usually degraded by the interference of exterior noises such as acoustic cavitation in water stream, host structural vibration in the hull, and propeller motions. This paper describes the design and evaluation of a self noise suppressing hydrophones which shows very poor sensitivity to the external noises, first, effects of the external noise on the its receiver performance is simulated with finite element method(FEM). Second, the geometrical variations are implemented on the original structure that include additional air pockets and acoustic walls which work as acoustic shied or scatter of the noises. The results show that the effect of the external noise is the most significant when it is applied near to the bottom of the side wall of the hydrophones. The transverse noise induced by the outside water flow is isolated most effectively when a thin compliant (damping) layer combined with two air pockets is inserted to the circumference of the nose. Noise level is reduced about fifty nine percent of that of the original structure.

• Journal of Korean Medicine for Obesity Research
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• v.15 no.1
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• pp.33-37
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• 2015

Objectives: The purpose of this study is to report the effectiveness of Korean medicine treatment on 254 patients visited obesity clinic. Methods: Two hundred fifty-four patients, who had visited obesity clinic from May 2013 to November 2014, were analyzed by bioelectrical impedance analysis. We analyzed changes of weight, skeletal muscle mass, fat mass, body mass index (BMI) and body fat percentage after treatment, also investigated differences of weight and fat mass loss according to age, BMI and body fat percentage. Results and Conclusions: Male and female percent of the study group was 3.5% and 96.5%. All patients were constituted with 50.0% of 20~29-year-old group, 34.1% of 30~39-year-old and 15.9% of 40 and more year-old. In BMI, $21kg/m^2$, $21.0{\sim}22.9kg/m^2$, $23.0{\sim}29.9kg/m^2$, above $30kg/m^2$ were 20.5%, 30.3%, 42.1%, 7.1%, respectively. In Body fat percentage, under 25%, 25.0%~29.9%, 30.0%~34.9%, above 35% were 11.4%, 23.2%, 30.7%, 34.6%, respectively. 96.1% of patients were showed weight loss compared with baseline, the decrease of body weight was $2.96{\pm}1.86$ kg, that of BMI was $1.13{\pm}0.70kg/m^2$ and that of body fat percentage was $2.43%{\pm}2.06%$ after 1 month treatment. We observed a decline of weight and fat mass with higher BMI and body fat percentage at the baseline.

• The Korean Journal of Ecology
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• v.28 no.2
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• pp.79-83
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• 2005

We investigated the species richness of macrolepidoptera (including pyralid moths) in the evergreen broad-leaved forests of southwestern coast of Korea. The studied site was Mt. Duryunsan and its neighboring area, Haenam-gun, Jollanam-do and moths were identified and analyzed after collecting them with UV light traps from 2001 to 2004. A total number of species comprised 18 families and 489 species. We expected that the number of species would be increased when the species of microlepidoptera and butterflies were included. The family Noctuidae with 181 species was dominant in the area followed by Geometridae with 129 species and Pyralidae with 72 species. Based on number of collected individuals, Geometridae was the highest and followed by Noctuidae, Pyralidae and Drepanidae. Fifty-one percent of the total species consisted of less than two specimens in the collected sample. Monthly changes of numbers of species and individuals were examined and indices of Simpson's heterogeneity and evenness were also drawn. We briefly discussed the possibility of moth species or group of species as bioindicator for assessing the condition of forest after disturbance.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.6C
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• pp.619-624
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• 2002

In this paper, a novel architecture of programmable divider with fifty percent duty cycle output and programmable dividing number has been proposed. Through HSPICE simulation, a 900MHz frequency synthesizer with proposed (sequency divider has designed in a standard 0.25㎛ CMOS technology To verify the operation of proposed frequency divider, a chip had been fabricated using 0.65㎛ 2-poly, 3-metal standard CMOS processing and experimental result shows that the proposed frequency divider works well. The designed voltage controlled oscillator(VCO) has a center frequency of 900MHz a tuning range of $\pm$10%, and a gain of 154HHz/V. The simulated frequency synthesizer performance has a settling time of 1.5$\mu$s, a frequency range from 820MHz to IGHz and power consumption of 70mW at 2.5V power supply voltage.

• Journal of Environmental Health Sciences
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• v.26 no.4
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• pp.21-28
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• 2000

Various man-made mineral fibers(MMMF) including refractory ceramic fiber(RCF) have been used widely in industries as insulation materials. The effect of fibrous dust on human health depends on fiber size, concentration (exposure level), and durability in biological system. Therefore, these parameters should be determined to evaluate accurately the potential risk of fibers on human health. The purpose of this study was to characterize the size of airborne fiber and the workers＇ exposure to airborne fibers in refractory ceramic fiber manufacturing and processing factories. Airborne fibers were collected on 25-mm mixed cellulose ester membrane filters at personal breathing zones, and analyzed by A and B counting rules of the National Institute for Occupational Safety and Health(NIOSH) Method # 7400. The average ratios of the fiber density by B rule to the fiber density by A rule was 0.84. This result indicates that the proportion of respirable fibers (<3 ${\mu}{\textrm}{m}$ diameter) in air samples was high. The average diameter and length of airborne fibers were 1.05${\mu}{\textrm}{m}$ and 35${\mu}{\textrm}{m}$, respectively. The average fiber concentrations (GM) of all personal samples was 0.26f/cc, and the average concentration was highest at blanket cutting and packing processes. The fifty seven percent of personal air samples was exceeded the proposed American Conference of Governmental Industrial Hygienists(ACGIH) Threshold Limit Value(TLV), i.e. 0.2 f/cc. It was concluded that the RCF industrial workers had the higher potential health risk due to small fiber diameter, long fiber length, and high exposure level to the airborne fibers.