• 한국치위생학회지
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• 제7권2호
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• pp.167-176
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• 2007

Objectives: The purpose of this study was to investigate the dental caries activity of some commercial drinks. Methods : Acidity levels were recorded as pH values of original drinks and amount of 50%-sodium hydroxide(NaOH) required to neutralize by titration 50.00ml of the drink(It was called titratable acid). Acidity of the drinks with S. sobrinus was measured at an interval of one hour after incubating ($37^{\circ}C$) the test drinks and control solution which was composed 20.00ml of neutralized drinks as pH 7.0 with 0.2ml of a pooled suspension of S. sobrinus. Results : The drink with the highest pH value was the Cow's milk(pH $6.70{\pm}0.01$), and the most acidic was the Carbonated drink(pH $2.40{\pm}0.02$). The drink with the highest buffer effect was the Fruit juice($139.78{\pm}0.76$), and the lowest was the Glucose solution(control, $4.42{\pm}0.20$). The drinks with S. sobrinus during incubation at $37^{\circ}C$ for 24h were decreased to below critical pH 5.5. Spending times from pH 7.0 to pH 5.5~5.0 were Glucose solution(less than 1h). Carbonated drink(3h), Fruit juice(5h), Cow's milk(8h) and Mixed drink(21h). Conclusions: These results show that some commercial drinks with S. sorbrinus have the possibility of tooth decalcification. Thus, it is suggested that the people who have the low salivary secretion rate and the children who sleep without toothbrushing after drinking need the instruction for diet control and oral health education.

• Nuclear Medicine and Molecular Imaging
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• 제40권1호
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• pp.51-52
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• 2006

A 39-year-old female patient who had undergone a total thyroidectomy for a papillary thyroid carcinoma underwent a whole body scan with I-131. The I-131 scan was performed 72 hours after administering 185 MBq (5 mCi) of an I-131 solution. The anterior image of the head, neck, and upper chest showed multiple areas of increased uptake in the mediastinal area considering of functional metastasis. However, radioactivity was not evident in the image taken after removing her clothes and muffler. The image obtained after placing the muffler on the pallet showed that the radioactivity was still present. It is well known that artifacts on an I-131 scan can be produced by styling hair sputum, drooling during sleep, chewing gum, and paper or a cloth handkerchief that is contaminated with the radioactive iodine from either perspiration or saliva. This activity might be mistaken for a functional metastasis. Therefore, it is essential that an image be obtained after removing the patient's clothes. In this study, artifacts due to a contaminated muffler on the I-131 scan were found. These mimicked a functional metastasis of the mediastinal area in a patient with a papillary thyroid carcinoma.

• 인터넷정보학회논문지
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• 제10권4호
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• pp.151-160
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• 2009

무선 네트워크 솔루션은 자유로운 이동성과 설치의 간편성 때문에 많은 영역에서 사용되고 있다. 무선 네트워크를 구성하는 센서들이 서로 정보를 공유하기 위해서는 무선통신을 지원하는 프로토콜이 필요하다. 대표적인 프로토콜은 Mobile IPv6가 있다. 그러나 각 센서들은 제한된 전력과 컴퓨팅 능력을 갖기 때문에 이 프로토콜을 사용하는 것은 매우 비효율적이다. 본 논문에서는 이러한 문제를 해결하기 위해 에너지 효율을 높일 수 있는 개선된 센서 회로를 설계하였으며, 센서 네트워크상에서 필요하지 않은 센서를 휴면상태로 둠으로써 에너지 소비를 줄일 수 있는 알고리즘을 구성하였다.

• 한국환경보건학회지
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• 제50권2호
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• pp.81-82
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• 2024

Urban air mobility (UAM) is emerging as an innovative transportation solution for cities. However, the potential noise impact on urban life must be carefully examined. Continuous exposure to UAM noise, with its unique frequency characteristics and temporal variability, may adversely affect citizens' health by causing sleep disorders, cardiovascular disease, and cognitive impairmenet, particularly in children. NASA has formed a UAM Noise Working Group to study this issue comprehensively. In Korea, the Seoul Metropolitan Government's UAM demonstration project is expected to accelerate related research and development. Scientific analysis, including noise measurement, prediction modeling, and health impact assessment, must be prioritized. Measures to minimize noise should be established based on this evidence, such as optimizing flight modes, developing noise reduction technologies, and establishing new noise management standards. Transparency and social consensus are crucial throughout this process. Expert review and open communication with civil society are necessary to address related concerns. Sharing demonstration project results and providing opportunities to experience UAM noise through digital twin simulations can help address public concerns and build social consensus. Proactively and scientifically tackling noise issues is essential for the sustainable development and successful integration of UAM into daily life.

• 융합보안논문지
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• 제12권5호
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• pp.87-97
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• 2012

최근 개인정보유출 사건이 빈번히 발생함에 따라 개인정보보호의 문제는 우리 사회의 가장 중요하고 민감한 사회적 의제로 급부상하고 있다. 실제로 개인정보는 그 종류나 유형, 경제적 가치와 민감성, 정보의 질 등에 따라 유출 시 심각한 사회적 위협을 야기할 수 있기 때문에 보다 정확하고 체계적인 개인정보보호 및 관리가 이루어지지 않을 경우 정보화 사회에 큰 혼란을 초래할 수 있다. 특히 업무에 있어 고객의 민감한 개인정보를 필요로 하는 중소 경호 경비업체의 경우, 수집한 정보가 유출 될 시 고객 신변이나 업체의 영업 비밀이 외부에 노출 되 심각한 위협이 있을 수 있어 더욱 큰 문제를 야기한다. 그러나 중소 경호 경비업체는 대기업에 비해 자금의 정도, 인력 부족 등의 문제로 인하여 자체 보안 시스템 구축에 많은 어려움이 있다. 따라서 본 연구에서는 경호 경비업체의 실정을 살펴보고, 그 중 중소 경호 경비업체들이 차지하는 규모와 정보보호의 현황, 특징들을 분석하여 정보보호 시스템 마련의 현실적 문제점 해결 방안으로 중소 경호 경비업체의 개인정보유출 방지를 위한 보안체계를 제안한다.

• 한국간호교육학회지
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• 제13권2호
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• pp.257-265
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• 2007

Purpose: This study was done to investigate sexual problem behaviors of high school students in one province, North Cholla. Method: The participants in this research were 951 high school students, grades 1, 2 and 3, chosen at random in big cities, small towns and rural areas of North Cholla Province. Result: The routes for sexual knowledge acquisition were through a peer group or an older member(35.8%), internet(29.8%), classes and the teacher at school(18.8%), multimedia(8.4%) and parents (7.2%). The percentages for domains of sexual problem behaviors were masturbation 36.7%, sexual impulse 35.6%, voyeurism 12.6%, sexual violence 9.6%, transvestism 4.1%, prostitution 3.5%, exhibitionism 3.1%, and pregnancy of a female student 0.6%. Sexual problem behaviors experienced by 30% or more of the students were reported as the experience of the desire to embrace, the desire to kiss, the desire to touch a friend's body of the opposite sex, masturbation and the desire to sleep with a friend of the opposite sex. The biggest sexual problem behaviors for the students were sexual impulses toward friends of the opposite sex and masturbation. These experience rates were higher for boys than for girls(p<.05), higher vocationally than academicly(p<.05), and higher in the largest cities than smaller cities and rural area(p<.05). Conclusion: These findings suggest that systematic programs that focus on a problem solution method should be developed for sexual problem behavior prevention.

• Journal of Community Nutrition
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• 제8권4호
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• pp.185-192
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• 2006

This study was performed to investigate factors affecting sensitivity and preference for salty tastes of Korean adult females. Sensitivity and preference for salty tastes were determined as detection threshold concentration of NaCl solution and the optimally-preferred NaCl concentration of the bean sprout soup, respectively. A self-administered questionnaire was used to obtain the information regarding general characteristics, self diagnosis of stress, health-related lifestyle practices, dietary habits and food preferences. Dietary intake using 24-hours recall and blood pressure were measured. Salty taste detection thresholds and optimally-preferred NaCl concentrations were 0.0197% and 0.357%, respectively. There was a significant positive correlation between the optimally-preferred salt concentration and age, despite no significant correlation between either sensitivity or preference for salty taste and sodium intake, which was 3,605mg/day. Those who had bread or cereal with milk as breakfast instead of a traditional Korean meal and those who preferred jjigae to soup had significantly higher NaCl preferences for bean sprout soup. Going to bed after midnight and skipping meals (${\geq}3/week$) decreased salty taste sensitivity without reaching statistical significance. Self awareness of one's own health, recent weight changes, family history of hypertension, sleep quality, getting-up time, rate of eating and other food preferences did not affect either perception. Stress level, TV watching, BMI and sodium intake did not have significant correlation to sensitivity or preference. Further research including a large number of well-controlled subjects and more accurate measurement of sodium intake should be directed to find other factors affecting salt preference and sensitivity in order to decrease Na intake and related diseases.

• 한국통신학회논문지
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• 제34권1A호
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• pp.41-49
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• 2009

무선 센서 네트워크의 노드들은 제한된 배터리 에너지 자원으로 운용되고, 사용자로부터 원거리 또는 산악지대와 같이 배터리 교체가 쉽지 않은 곳에 배치되기 때문에 한정된 에너지를 효율적으로 사용하는 기술이 매우 중요하다. 이를 위해 여러 가지 프로토콜들이 연구되어 왔는데, 특히 wakeup 스케줄링 프로토콜은 가장 효과적이고 실용적인 기법으로 간주되어 왔다. Wakeup 스케줄링 프로토콜에서는 같은 지역에 대해 중복되게 센싱하고 있는 노드들이 있다면 적정한 수의 노드만 활동하게 하고 나머지는 활동하지 않게 함으로써 전체적인 네트워크의 에너지 사용 효율을 높일 수 있다. 본 논문은 무선 센서 네트워크에서 관심지역을 중복하여 센싱하는 노드의 수를 최소화하면서 응용에서 요구하는 센싱 커버리지 수준을 유지하는 wakeup 스케줄링 프로토콜을 제안한다. 제안된 프로토콜은 이웃 노드와의 가중 평균거리를 이용하여 작동여부를 결정하게 되며 네트워크의 상황에 따라 wakeup 할 수 있는 기준치를 동적으로 변화함에 따라 요구된 센싱 커버리지를 오랫동안 유지될 수 있도록 해준다.

• 한국식품위생안전성학회지
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• 제36권5호
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• pp.440-446
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• 2021

GABA는 식물, 동물 및 미생물 등 자연계에 다양하게 존재하고 있으며, 항고혈압, 이뇨, 진정, 수면유도 및 항스트레스 등 다양한 효과가 있는 것으로 알려져 있어서 식품, 의약품 소재로 활용되고 있다. 본 연구에서는 김치로 부터 분리한 GABA 형성 유산균을 옥수수 수염 추출물에 적용하여 발효 특성과 발효물의 항산화 효과에 대해 분석하였다. 신규 L. plantarum LAB459의 분리와 동정은 생화학적 특성, 당자화성 및 16s rRNA 염기 서열 분석을 통해 확인되었다. 그리고 TLC와 HPLC 분석을 통해 분리된 L. plantarum LAB459가 GABA 생성능이 있는 것으로 나타났다. 그리고 탈지유가 포함된 옥수수 수염 열수 추출물에 대해 발효를 수행한 결과, 동결 건조된 발효물에 약 1 ㎍/mg 수준의 GABA가 형성된 것을 확인하였다. 또한 발효물에 대한 플라보노이드와 항산화 분석은 옥수수 수염 열수 추출물에 비해 더 높은 것으로 나타났다. 따라서 본 연구에서 분리된 L. plantarum LAB459는 다양한 식품 발효의 스타터 또는 식품 소재와 의약품 소재로 적용이 가능할 것으로 판단된다.

• 동의신경정신과학회지
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• 제32권3호
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• pp.185-206
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• 2021

Objectives: The objective of this study was to perform a systematic review and meta-analysis of pharmacopuncture treatment for insomnia disorder to derive clinical evidence and recommendation grades. Methods: Studies that verified effects of pharmacopuncture on primary insomnia were included. Characteristics and quality of included studies were assessed using Risk of Bias (RoB). Results: A total of 25 studies were selected. Pittsburgh Sleep Quality Index (PSQI) and effective rate were primarily used for outcome measurement. Vitamin B12 was the most used pharmacopuncture material. The most frequently used acupuncture point was Anmian (Ex-HN). The volume of the acupuncture solution ranged from 0.25 mL to 2 mL. Acupuncture treatment depth was 0.5 cm to 2 cm. In three studies, the procedure was performed at 16:00. Meta-analysis of studies revealed that the effective rate of the pharmacopuncture group was significantly higher than the group using sleeping pills group (RR: 1.21, 95% CI: 1.01 to 1.45, p=0.04, I²=69%). PSQI was decreased in the intervention group (MD=-2.19, 95% CI: -2.90 to -1.48, p<0.00001, I²=0%). Effective rates of pharmacopuncture and acupuncture groups were higher than that of the acupuncture group (RR: 1.11, 95% CI: 1.05 to 1.17, p=0.0002, I²=0%). PSQI was decreased in the intervention group (MD=-1.87, 95% CI: -2.36 to -1.38, p<0.00001, I²=0%). Although the effectiveness rate of the pharmacopuncture group was not significantly higher than that of the acupuncture group (RR: 1.12, 95% CI: 0.98 to 1.27, p=0.1, I²=9%), the PSQI was decreased in the pharmacopuncture group (MD=-2.10, 05% CI: -3.29 to -0.91, p=0.0005, I²=34%). The quality of clinical studies was poor. Conclusions: Based on results of this study, it is proper to use 0.5 to 2 mL of pharmacopuncture solution such as Danshen and Ciwujia with a depth of 0.5 to 2 cm at around 4 p.m. to treat insomnia disorder, focusing on Anmian (Ex-HN) and Sameumgyo (SP6).