• Journal of Korean society of Dental Hygiene
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• v.8 no.2
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• pp.23-37
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• 2008

The purpose of this study was to examine the knowledge of dental hygiene students about hepatitis B including its seriousness, dissemination, infection route and prevention in an effort to lay the foundation for dental hygiene health education geared toward dental hygiene students who were going to work in clinical field, The subjects in this study were 134 dental hygiene freshmen, 124 sophomores and 102 juniors in some region. The survey was conducted from April 1, to April 14, 2008. An analysis of frequency and X2-test were performed through SPSS 12.0 program. After a survey was conducted, the following findings were given : 1. As for the seriousness of hepatitis B, by academic year the rates of the juniors, sophomores and freshmen who had a correct knowledge stood at 92.6 percent, 84.8 percent and 84.4 percent respectively. Thus, the students were better knowledgeable with academic year. 2. As for dissemination of hepatitis B, by academic year the rates of the juniors, sophomores and freshmen who had a correct knowledge stood at 60.3 percent, 54.8 percent and 52,7 percent respectively. Thus, the students were better knowledgeable with academic year. 3. As for infection route, by academic year the rates of the juniors, sophomores and freshmen who had a correct knowledge stood at 42.9 percent, 44.8 percent and 56.7 percent respectively. Thus, the students were lower knowledgeable with academic year. 4. As for prevention of hepatitis B, by academic year the rates of the juniors, sophomores and fresh men who had a correct knowledge stood at 71.3 percent, 66.5 percent and 58.4 percent respectively. Thus, the students were better knowledgeable with academic year. 5. As for general knowledge of hepatitis B by academic year the rates of the juniors, sophomores and freshmen who had a correct knowledge stood at 54.7 percent, 52.6 percent and 50.7 percent respectively. Thus, the students were better knowledgeable with academic year The findings of the study indicated that many of the students gave the right answers to the questions about the seriousness and prevention of hepatitis B, and that the rate of the correct answers about the route of dissemination was lowest, Accordingly, students should be taught to have a correct understanding of hepatitis B to help provide appropriate preventive treatment and take proper measures.

• Korean Journal of School Psychology
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• v.16 no.2
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• pp.89-110
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• 2019

This study is to verify relative influence of individual, parent, peer, teacher-related variables as protective factors and risk factors of academic hatred. Surveys were conducted with 1,015 (women, 57.3%) high school third grade students across eight schools where are located in Seoul, Incheon, and Geyonggi province. Correlation analysis and hierarchical multiple regression analysis were performed. The findings are summarized as follows. Teacher's academic pressure did not have significant correlation with student's basic psychological needs, teacher's autonomy support, teacher's support, and peer support whereas other variables showed significant correlation each others. The hierarchical multiple regression analysis indicated that student's individual competence and autonomy, parent's academic support, and teacher's emotional support work as protective factors and that parent's academic pressure functions as a risk factor. The effects of peer support disappeared when teacher-related factors were included. In addition, the effects of teacher's autonomy support disappeared, while the effects of teacher's support strengthened when learner's basic psychological needs were input. This study is meaningful in that it clarified academic hatred which had not been studied in other research and that it provided theoretical foundation for subsequent studies on academic hatred by examining relative influence of related variables. Lastly, it presented its limitation, implications on intervening strategies in school counseling, and suggestions for later studies.

• Journal of the Korean Society for information Management
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• v.37 no.4
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• pp.255-286
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• 2020

This study aims to identify the methods of implementation for the 'National Research Foundation of Korea Open Access 2021(Plan)'. This study covers the methods of implementation in the three following core items: 1) developing the details on the amount, method, and procedures of APC support; 2) proposing methods for facilitating the transition of domestic Korean academic journals to open access journals; and 3) developing methods of entrusting papers to open access repositories. APC support should be guaranteed at a reasonable level. The average or median of APC values for the previous three years will be applied to set the upper limit for support each year. APC support will be provided when the paper is published to open access journals or transitioning journals to open access. Hybrid journals or dual access journals are not included. Support for open access publishing of academic journals in Korea during the transition period will be available for open access journals that have registered for CCL in KJCI or journals that have submitted their application for transitioning to open access. Publishing in hybrid, dual access or subscription-based journals must be accompanied by items related to copyright such as embargo. Research results will be used for the detailed implementation plan of 'NRF OA2021 (Plan)'. They will serve as the base data for the rapid, stable, and sustainable implementation of open access policy in NRF, addressing the Korean domestic academic journal publishing environment and the field of international academic communication.

• Journal of the Korean Society for Library and Information Science
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• v.36 no.1
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• pp.259-296
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• 2002

The purpose of this Study is on the Foundation of the Great Library of Alexandria. The foundation of the Great Library at Alexandria was a natural consequence of the enormous growth for book production and the book trade, in which Athens had taken the lead from the fifth century BC. onward. Alexandria Library(BC. 290${\sim}$AD. 642) is the first to house the collection of comprehensive knowledge on the world in human history. The library is the birthplace of mainstream of Greek civilization and played a pivotal role in academic world. The purpose of this research could be summarized as fellows; The purpose of this research is 1) considering establishment, development and decline of Alexandria Library, 2) researching the historical foundation background of Museum and Library, 3) investigating effect on the cataloging history 4) reviewing the value of the Library’s stock of books. This Study employs historical research methods mainly through literature review and mutual comparative methods of many researcher’s studies.

• Korean Journal of Environmental Agriculture
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• v.39 no.4
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• pp.368-374
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• 2020

BACKGROUND: The residual analysis of polar pesticides has remained a challenge. It is even more difficult to simultaneously analyze multiple polar pesticides. Diquat, paraquat, and chlormequat are typical examples of highly polar pesticides. The existing methods for the analysis of diquat, paraquat and chlormequat are complex and time consuming. Therefore, a simple, quick and effective method was developed in the represent study for simultaneous analysis of diquat, paraquat and chlormequat in animal products, meat and fat using UPLC-MS/MS. METHODS AND RESULTS: Sample extraction was carried out using acidified acetonitrile and water and re- extracted with acidified acetonitrile and combine the extracts followed by centrifugation. The extract was then cleaned up with a HLB cartridge after reconstitution with acidic acetonitrile and water. The method was validated in quintuplicate at three different concentrations. The limits of detection (LOD) and quantification (LOQ) were 0.0015 and 0.005 mg/L, respectively. Matrix suppression effect was observed for all of the analytes. A seven point matrix matched calibration curve was constructed for each of the compound resulted excellent linearity with determination coefficients (R2) ≥ 0.991. Accuracy and precision of the method was calculated from the recovery and repeatability and ranged from 62.4 to 119.7% with relative standard deviation less than 18.8%. CONCLUSION: The recovery and repeatability of the developed method were in the acceptable range according to the Codex Alimentarius guideline. The developed method can be applied for the routine monitoring of diquat, paraquat, and chlormequat in animal products, meat and fat.

• Archives of Plastic Surgery
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• v.50 no.3
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• pp.264-273
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• 2023

The medial sural artery perforator (MSAP) flap is a versatile fasciocutaneous flap, and yet is less commonly utilized than other free flaps in microvascular reconstructions of the head and neck. The aim is to conduct a high-quality Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA)- and Assessment of Multiple Systematic Reviews 2 (AMSTAR 2)-compliant systematic review comparing the use of the MSAP flap to other microvascular free flaps in the head and neck. Medline, Embase, and Web of Science databases were searched to identify all original comparative studies comparing patients undergoing head and neck reconstruction with an MSAP flap to the radial forearm free flap (RFFF) or anterolateral thigh (ALT) flap from inception to February 2021. Outcome studied were the recipient-site and donor-site morbidities as well as speech and swallow function. A total of 473 articles were identified from title and abstract review. Four studies met the inclusion criteria. Compared with the RFFF and the ALT flaps, the MSAP flap had more recipient-site complications (6.0 vs 10.4%) but less donor-site complications (20.2 vs 7.8%). The MSAP flap demonstrated better overall donor-site appearance and function than the RFFF and ALT flaps (p = 0.0006) but no statistical difference in speech and swallowing function following reconstruction (p = 0.28). Although higher quality studies reviewing the use of the MSAP flap to other free flaps are needed, the MSAP flap provides a viable and effective reconstructive option and should be strongly considered for reconstruction of head and neck defects.

• Proceedings of the KAIS Fall Conference
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• 2006.05a
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• pp.572-576
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• 2006

본 시험은 산란계에 생균제를 급여하였을 때 산란계의 산란능력과 계분내 유해가스 감소에 미치는 영향을 규명하기 위하여 실시하였다. 산란계용 사료에 생균제를 0.2%와 0.5%를 처리한 구와 무처리의 3개 처리구를 두고 처리당 6반복, 반복당 4수씩 총 72수의 갈색 산란계(36주령)를 공시하여 6주간(42일) 사양 시험을 실시하였다. 산란계 사료에 생균제의 참가량을 증가함에 따라 산란율은 증가하였으며, 사료 섭취량은 감소하였다. 한편 계란의 품질에서는 생균제의 첨가량을 증가함에 따라 난중, 농후난백고, HU 및 난항색도가 증가하였다. 산란계의 영양소 이용율에서는 가용무질소물을 제외하고 건물, 조단백질, 조지방 및 조섬유 이용율이 생균제를 첨가함에 따라 증가하였다. 계분내 유해가스 발생량에서는 암모니아, 황하수소 및 멜캅탄 가스의 감소에 효과가 있었으며, 특히 황화수소의 감소에 효과가 있었다. 이상의 시험결과를 종합해 볼 때 산란계에 첨가한 생균제는 산란율을 증가시킬 뿐만아니라 계란의 품질 향상에 효과가 있었다. 또한 영양소 이용율을 개선하고 계분내 유해가스를 감소시키는 효과가 있었다.

• Korean Journal of Applied Biomechanics
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• v.26 no.4
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• pp.377-382
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• 2016

Objective: The purpose of this study was to provide data on gait characteristics of K-pop professional dancers. Method: Participants were divided into four groups: male dancers (n=10, age: $28.2{\pm}3.4years$, height: $175{\pm}6cm$, weight: $68.9{\pm}5.6kg$), female dancers (n=10, age: $26.7{\pm}3.1years$, height: $162{\pm}4cm$, weight: $52.1{\pm}3.7kg$), non-dancer males (n=10, age: $25.2{\pm}2.6years$, height: $171{\pm}6cm$, weight: $66.4{\pm}5.3kg$), or non-dancer females (n=10, age: $26.2{\pm}3.0years$, height: $161{\pm}5cm$, weight: $56.4{\pm}6.7kg$). Twelve infrared cameras (Qualisys, Oqus 500, Sweden, 150 Hz.) were used to capture three-dimensional motion data. Gait motion data of professional dancers and ordinary persons were obtained. Results: K-pop dancers' dynamic stability during the female toe off event and the male heel contact event was better compared with that of ordinary persons in the front-rear direction. In addition, the results showed a significant difference in the margin of stability (MoS). However, the medial-lateral direction of both female and male dancers during heel contact and the toe off event was more stable compared with ordinary person, who exhibited an increased MoS than did the dancers. Conclusion: This study aimed to investigate the gait characteristics of K-pop professional dancers in comparison with ordinary persons using gait parameters and MoS. The stability of K-pop professional dancers' dynamic gait in the front-rear direction was better than that in the medial-lateral direction. Therefore, further studies in which the dance movements of K-pop dancers are sub-divided and analyzed will be necessary to reduce related injury.

• The Korean Journal of Emergency Medical Services
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• v.19 no.3
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• pp.19-32
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• 2015

Purpose: This study examined the effect of wearing personal protective equipment (PPE) on cardiopulmonary resuscitation (CPR), positive airway pressure, and the posture of emergency medical technicians (EMTs) when conducting CPR. Methods: Twenty 119 EMTs performed 30:2 CPR on a manikin for 4 min. Imaging data were digitized with Kwon3D XP (version 4.0). Data were collected by analyzing the motion when starting in one cycle, such as pressing to the maximum and in the final position (relaxed), and were analyzed with SPSS 18.0. Results: The angle of the elbow joints was significantly reduced (p < .05). The trunk angle was statistically significantly (p < .01, p < .001) increased. The angular velocities of the shoulder joint and left elbow joint were reduced (p > .05). The angular velocity of the trunk was significantly reduced in the starting and maximum compression postures. The hand-escape time was increased. The average compression depth was increased but not significantly (p > .05). The positive airway pressure was reduced (p > .05). Conclusion: The angle of the elbow joints and the angular velocity of the trunk were reduced, and the angle of the trunk was increased. The success of CPR and positive airway pressure was reduced.

• Journal of the Korean Recycled Construction Resources Institute
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• v.9 no.4
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• pp.594-601
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• 2021

In order to expanding of the use of steel slag, a by-product of steel industry, as a road paving construction material, this present study confirmed the possibility of the rust formation of steel slag aggregate and evaluated the durability performance and the noise reduction characteristics of asphalt concrete mixture. As a result of conducting the rust formation test of aggregate, no rust was observed in both aggregate, so it is judged that the possibility of rust formation in the actual road water environment is very low. As a result of performing the moisture resistance test, all mixtures showed a tensile strength ratio exceeding 85%, satisfied the standard as asphalt mixture. In addition, the sound absorption coefficient of the steel slag aggregate mixture was measured to be higher than that of the general aggregate mixture. Accordingly, it is speculated th at th e steel slag aggregate mixture can more effectively respond to road noise reduction than the general mixture.