• 상하수도학회지
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• 제19권5호
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• pp.647-654
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• 2005

Recently, the economic losses caused by inundation are increasing due to the urbanization and industrialization, i.e., intensive land utilization and concentration of population and properties. It is regarded that the role of the storm sewer systems in urban areas becomes more important as one of the effective countermeasures for reducing the inundation losses. In this study, the effects of rainfall design frequency enhancement on the construction cost of the storm sewer systems were analyzed by increasing the design frequency from the present design frequency of the sewer systems, which is 5~10 years, to 15 years, 20 years and 30 years. The change rate functions of the design discharge and construction cost based on the various design frequencies were derived by regression analysis. According to the analysis, change the rate of design discharge at 15, 20, 30 years rainfall design frequencies were increased by 10%, 17.1%, and 27.2%, respectively, when compared to that at 10 year frequency. Furthermore, it was found that by increasing the design frequency from 10 years to 15 years, 20 years and 30 years, the construction costs were increased by 5.0%, 8.0% and 12.4%, respectively. Finally, their reliabilities need to be tested by applying the rate functions to the real storm sewer districts.

• 국제초고층학회논문집
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• 제12권1호
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• pp.1-9
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• 2023

The last 30 years have seen a rapid growth in the number of supertall buildings across the world, with newly completed buildings continuing to rank among the tallest 100 every year. Chinese projects notably play a pivotal role in these constant updates. It is caused by the interweaving of population and urbanization, economic considerations, and further, a series of accompanying urban problems. This paper focuses on the world's 100 tallest buildings in the last 30 years, and compares this collection of projects across five years via the dimensions of height, distribution, function and structural material. The intention is to discuss and interpret the influence factors and developing trends, some of which have been apparent over a dozen years, while others are just beginning to take shape, thus to provide an opportunity to preview the types of supertall buildings in the future.

• Anatomy and Cell Biology
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• 제56권2호
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• pp.185-190
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• 2023

The root canal morphology undergoes aging-related changes, and relevant quantitative analyses have not yet been reported. We compared the cone beam computed tomography (CBCT) and micro-computed tomography (microCT) scans of extracted mandibular incisors to check the accuracy of morphological measurements. Thereafter, the root canal morphology and aging-related changes in the mandibular incisors of Japanese individuals were assessed using CBCT. Six extracted teeth were fixed in a phantom head and imaged using CBCT and micro-CT. The correlation between the findings of the two imaging modalities was examined. Further, CBCT reconstructed images of the mandibular incisors of 81 individuals were observed. Age-related changes of the root canals were compared between participants aged <30 years and those aged ≥30 years. The CBCT and micro-CT findings regarding the root canals of the extracted teeth coincided in 94.4% of the cases. Mandibular incisors exhibiting two root canals in either cross-section accounted for 9.9% of central incisors and 12.4% of lateral incisors. Mandibular central incisors with two root canals were observed in two (6.3%) individuals aged <30 years and six (12.2%) aged ≥30 years. Mandibular lateral incisors with two root canals were observed in one (3.1%) individual aged <30 years and nine (18.4%) aged ≥30 years. CBCT allows accurate evaluation of complex root canal morphologies and is useful for endodontic preoperative assessment. Mandibular incisors have more frequent occurrence of two root canals with aging.

• 한국중재학회지:중재연구
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• 제31권3호
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• pp.91-107
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• 2021

The Korean Association of Arbitration Studies faces its 30th anniversary in 2020 since its foundation in 1991 and is being celebrated and congratulated across the communities in and out of the country. However, the association seems to be standing at crossroads between a negative and positive direction. As shown in the past KAAS pattern in its academic activities, the academic community tends to focus relatively more on domestic issues, expanding its domestic network rather than international network for the past years. KAAS needs to turn its face to see the other side of the world, stretching its hands to the people outside first. For this purpose, this paper suggests that KAAS should strengthen its cooperative capability through the international cooperation division. KAAS' past 30 years of accumulated know-how and its academic network will play critical roles i-n expanding its partners across the global academic community. This paper delivers special thanks to the institutions, including the LMAA, CAC, SIAC, HKIAC, RSPP/ACRU, IDAC, and LAMC who sent cooperative works and congratulatory messages to KAAS 30th anniversary despite the COVID-19 pandemic situation.

• 한방안이비인후피부과학회지
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• 제13권1호
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• pp.280-290
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• 2000

We analyzed statistics study in 1695 patients, who had visited to the Dept. of surgery, ophthalmology & otolaryngology Hospital of Downtown Orirental Medicine Kyung Hee University from March, 1996 to July, 1998. The results were as follows. 1. Distribution of ophthalmology, otolaryngology and dermatology classification was $43.48\%\;in\;ophthalmology,\;16.70\%\;in\;rhinology,\;5.72\%\;in\;laryngology,\;17.94\%\;in\;dermatology\;and\;16.17\%$ in otiatrics. 2. Ophthalmology group were $31.93\%$ males and $47.90\%$ females in 10 years old within. In treatment term, opthalmology patients who had treated for 1 month within was $59.70\%$. Strabismus and visual disorder was the most common ophthalmo-disease. 3. Rhinology group were $30.00\%$ males in 10 years old within and $21.56\%$ females in 21-30years old. In treatmentm, rhinology patients who had treated for 1 month within was $53.71\%$. Rhinitis and sinusitis was the most common rhinio-disease. 4. Otiatrics group were $30.54\%$ males in 41-50 years old and $31.78\%$ females in 51-60 years old. In treatment term, otiatries patients who had treated for 1 month within was $53.28\%$. Tinnitus, hearing loss and otitis media was the most common otiatrics-disease. 5. Laryngology group were $29.27\%$ males in 31-40 years old and $28.57\%$ females in 51-60 years old. In treatment term. Laryngology patients who had treated for 1 month within was $91.75\%$ Epipharyngitis and abnormal sensation pharyngolarylgeal region was the most common laryngo-disease. 6. Dermatology group were $39.82\%$ males and $39.79\%$ females in 21-30 years old. In treatment term, dematology patients who had treated for 1 month within was $83.55\%$. Acne and Pruritus was the most common ophthalmo-disease.

• 치위생과학회지
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• 제9권2호
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• pp.231-239
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• 2009

본 연구는 2008년 3월 26일부터 4월 16일까지 서울, 경기, 충북지역의 18세 이상의 미혼 또는 기혼의 가임여성을 대상으로 총 210부의 설문지를 배부하여 직접 작성하게 하였으며, 자료처리에 부적합한 2부를 제외한 208부를 자료 분석 이용하였다. 임신 중 구강진료와 구강건강상태 및 구강건강관리 인지도를 조사 분석하기 위하여 본 연구를 진행하였으며, 임산부의 구강건강관리 행태를 개선하기 위한 구강보건교육 프로그램 개발의 기초자료로 제공하고자 하였다. 1. 임신기간 중 입덧 후 잇솔질을 하는가에 대해 연령에 따라서는 18~29세(67.3%), 30~39세(47.3%)는 한다는 응답이 많았고, 40~49세(51.0%), 50세이상(52.0%)은 잇솔질을 하지 않는다는 응답이 많은 것으로 조사되었으며(p < 0.001), 임신경험 유무에 따라서는 임신 중인 조사자 72.2%, 출산경험이 있는 조사자 43.0%가 하는 것으로 조사되었다(p < 0.05). 2. 구강진료 중 걱정되는 것에 내에 연령별에 따라서는 50세 이상(56.0%)에서는 비용이라고 응답하였으며, 18~29에(39.2%), 30~39세(44.6%), 40~49세(41.5%)는 통증이라는 응답이 가장 많았다(p < 0.05). 임신경험 유무에 따라서는 임신 중인 조사에서는 통증(38.9%), 유산(27.8%), 비용(22.2%)순이었으며, 출산경험이 있는 조사자들은 통증(45.0%), 비용(22.8%), 유산(14.8%) 순으로 응답하였고, 임신경험이 없는 조사자는 비용(52.2%), 통증(13.0%)순으로 응답하였다(p < 0.05). 3. 임신 중 구강진료를 받아야 하는가에 대해 연령별에 따라 18~29세, 50세 이상에서는 받으면 안된다가 각각 41.9%, 52.0%로 가장 높았으며, 30~39세와 40~49세는 각각 53.6%, 54.7%가 받아도 된다는 응답이 가장 높은 것으로 조사되었다. 임신경험 유무에 따라서는 임신 중인 조사자는 63.9%, 출산경험이 있는 조사자는 46.3%가 받아도 된다고 응답하였으며, 임신경험이 없는 조사자는 받아도 된다, 받으면 안된다가 각각 34.8%로 조사되었다(p < 0.05). 4. 보조구강위생용품이 필요한가에 대해 18~29세(47.3%), 30~39세(46.4%)에서는 필요하다는 응답이 가장 많았으며, 40~49세(41.5%), 50세 이상(48.0%)은 모르겠다는 응답이 가장 많았다(p < 0.05).

• 한국치위생학회지
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• 제11권1호
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• pp.59-68
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• 2011

Objectives : To investigate the knowledge and recognition level of fluorine by teaching career among class teachers, who are primarily responsible for oral health education, despite lack of expertise in oral health, by playing a model role for students through continuous contacts with them, and provide basic elementary data about accurate knowledge and how to correctly use fluorine remarkably effective in preventing dental caries. Methods : A self-administered survey was conducted with 539 teachers at 21 elementary schools in Jinhae City from September 1 to October 15, 2010, drawing the following conclusions. Results : 1. As for the channel for acquiring knowledge of oral health, the highest frequency was found in health programs for respondents with less than 9 years of career, in dental clinics for those with 20 to 29 years of career, and in PR booklets for those with 10 to 19 years and 30 years and longer of career. 2. Use of fluorine-containing toothpaste and fluorine spread is very effective and effective in preventing dental caries got 64.9%, 72.2%, 72.3%, 77.7% and 54.0%, 63.1%, 62.2%, 69.7%, respectively, among elementary school teachers with less than 9 years, 10 to 19 years, 20 to 29 years, and 30 years and longer of career. 3. Intake of fluoride and toothbrushing with fluoric solution is very effective and effective in preventing dental caries got 33.3%, 40.1%, 39.5%, 55.3% and 50.0%, 54.9%, 48.8%, 69.7%, respectively, among elementary school teachers with less than 9 years, 10 to 19 years, 20 to 29 years, and 30 years and longer of career. 4. Use of fluoric tablets is very effective and effective in preventing dental caries got 32.9%, 36.0%, 36.1%, 47.3%, respectively, among elementary school teachers with less than 9 years, 10 to 19 years, 20 to 29 years, and 30 years and longer of career. 5. Most of the elementary school teachers knew the fact that fluorine increases dental resistance to cavity and prevents bacterial growth but gave incorrect responses to properties of becoming basic nutrients or inducing recalcification. Conclusions : Various types of application of fluorine during the elementary-level childhood experiencing the most frequent dental caries will be very useful in improving oral health in the future. It is necessary to enable class teachers to get correct recognition of fluorine through supplementary and job training based on technical knowledge and various educational materials so that they, who are directly responsible for health management through continuous contacts with students, can understand how to correctly use fluorine and get accurate knowledge.

• 상하수도학회지
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• 제30권2호
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• pp.155-165
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• 2016

Pipe Deterioration Prediction (PDP) and Pipe Failure Risk Prediction (PFRP) models were developed in an attempt to predict the deterioration and failure risk in water mains using fuzzy technique and the markov process. These two models were used to determine the priority in repair and replacement, by predicting the deterioration degree, deterioration rate, failure possibility and remaining life in a study sample comprising 32 water mains. From an analysis approach based on conservative risk with a medium policy risk, the remaining life for 30 of the 32 water mains was less than 5 years for 2 mains (7%), 5-10 years for 8 (27%), 10-15 years for 7 (23%), 15-20 years for 5 (17%), 20-25 years for 5 (17%), and 25 years or more for 2 (7%).

• Asian Pacific Journal of Cancer Prevention
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• 제14권2호
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• pp.853-857
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• 2013

Objectives: Breast cancer is a leading cause of morbidity and mortality in women worldwide. Breast screening in normal and/or asymptomatic women is essential to reduce the burden of breast malignancies. Our study aimed to identify possible risk- and/or co-factors associated with breast screening in North Indian women. Methods: A public health research survey was conducted among 100 women of North Indian ethnicity during clinic visits in a 6-month timeline (April-October 2012). Demographic and clinical data, including mammography screening, were recorded in the questionnaire-based proforma after conducting a 10 minute interview. Written informed consent was taken from all the participants. Results: The mean age of the participants was $32.2{\pm}9.9$ years. Out of 100 women, 6% had family history of breast disease. Breast-related complaints/malignancy, including galactorrhoea, mastitis, axillary lump, fibrocystic disease, fibroadenosis and adenocarcinoma were observed in 41% participants; age stratification revealed that 82.9% of this group (n=41) were <30 years, while 9.7% and 7.3% were >30 years and 30 years of age, respectively. 32% participants underwent mammography screening and 8% had breast ultrasound imaging. Age stratification in the mammography screening group demonstrated that 24 women were <40 years, while 7 women were >40 years. Conclusions: Our pilot study identified possible co-factors affecting breast screening in North Indian women. These findings may be beneficial in early detection of breast abnormalities, including malignancies in women susceptible to breast cancer, and thus aid in future design of cost-effective screening strategies to reduce the increasing burden of breast carcinoma in women worldwide.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2008년도 춘계 학술논문 발표대회
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• pp.141-145
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• 2008

In this paper, non working day for the construction project in Cheongju region considering weather condition for 30 years from 1971 to 2000 and 10 years from 1991 to 2000 as statistical periods was estimated. In Cheongju region, there was no remarkable difference between them because non working day for outside and half outside work was 157days and for interior work 144days at statistics for 30 years., and utside and half outside work was 159days and for interior work 142days at statistics for 10 years.. However, non working day due to high temperature is slightly increased, and non working day due to cold weather is slightly decreased in the case that the recent statistical data was used caused by global warming. Non working day due to rainfall was 23 days at statistics for 30 years, and it was 28 days at statistics for 10 years.