• 한국추진공학회지
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• 제22권3호
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• pp.53-64
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• 2018

본 논문에서는 초음속 유동장 내 연료 수직 분사 조건에서 분사구의 형상에 따른 연료/공기 혼합 특성을 분석하고자 하였다. 이를 위해 동일한 분사구 출구 면적과 유량 조건에 대해 수소와 공기에 대한 비반응 유동장 전산 해석을 수행하였다. 해석 결과의 검증을 위하여 자유류 마하수 3.38, 제트-자유류 운동량 플럭스비 1.4 인 평판 분사 시험을 모의하였다. 5개의 서로 다른 형상을 갖는 분사구를 이용하여 형태에 따른 박리 구간, 분사 제트의 구조의 차이를 살펴보고 분사구 후류에서 수소의 침투 높이와 수소-공기의 혼합에 따른 가연 면적에 변화를 확인함으로써 분사구 형상에 따른 연료/공기 혼합 특성을 정량적으로 비교하였다.

• 한국경제지리학회지
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• 제18권2호
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• pp.190-205
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• 2015

지식경제 하에서 국가 및 지역의 경제발전과 경쟁력을 위해서는 과학기술의 기반을 유지하고 지속적인 연구개발을 통한 혁신이 중요하다. 이런 맥락에서 새로운 지식 및 기술을 창출하고 확산시키는 기관으로서 대학의 역할이 과거 그 어느 때보다 강조되고 있다. 이 연구는 산학협력, 특히 대학과 외부 기관 간의 기술이전 및 지식교환의 양상을 파악하고, 대학의 기술이전이 지역과 지역 소재 기업들의 혁신과 경쟁우위를 확보하는데 얼마나 영향을 미치는지를 설명해 보고자 한다. 전남대학교의 기술이전, 특히 대학의 구성원이 창출한 특허 지식 및 기술의 사업화에 의거하여 살펴본 사례 분석의 결과는 전남대학교가 창출한 지식과 기술의 많은 부분이 대학 소재 지역인 광주 및 전남 지역으로 이전되고 있으며, 따라서 대학의 기술이전이 지역경제에 일정부분 영향을 미치고 있음을 확인할 수 있다.

• 수산해양교육연구
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• 제26권3호
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• pp.597-610
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• 2014

The purpose of this study was to inquiry of influence of Meister high school and specialized vocational high school' students on career maturity in problem solving ability domain of test for enhanced employ ability & upgraded proficiency. Research subjects and region were sophomore students of each one of Meister high schools and specialized vocational high schools in Gwangju region. The sample(N=481) was drawn from 2 high schools and collected data were analyzed with SPSS using t-test, Pearson correlation and Levene's test. Items of problem solving ability domain of test for enhanced employ ability & upgraded proficiency were used test items developed in 2012. Career maturity test in Careernet site was used test items developed in 2001 which was made up 3 domains such as attitude, ability and action and 8 sub-regions such as planning, attitude on the vocation, independence, self-understanding, rational decision-making, explore of information, knowledge of hope vocation and career exploration and preparation of action, and constituted 64 items. The results were as follows. Findings of the analysis in specialized vocational high school students demonstrated the positive results of rational decision-making and explore of information in problem solving ability test for enhanced employ ability & upgraded proficiency. Comparing career maturity influence on Meister high school with specialized vocational high school students about problem solving ability domain of test for enhanced employ ability & upgraded proficiency, Meister high school students' score were more high grade than specialized vocational high school students grade.

• 대한치과보철학회지
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• 제41권3호
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• pp.351-359
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• 2003

Statement of problem: Regardless of any restoration, most of case, we used in screw connection between abutment and implant. For this reason, implant screw loosening has been remained problem in restorative practices. Purpose: The purpose of this study was to compare surface of coated/plated screw with titanium and gold alloy screw and to evaluate physical property of coated/plated material after scratch test in FESEM investigation Material and methods: GoldTite, titanium screw provided by 3i (Implant Innovation, USA) and TorqTite, titanium screw by Steri-Oss (Nobel Biocare, USA) and gold screw, titanium screw by AVANA (Osstem Implant, korea) - were selected for this study. Each abutment screw surface was observed at 100 times, and then screw crest, root, and slope were done more detailed numerical value, at 1000 times with FESEM. A micro-diamond needle was also prepared for the scratch test. Each abutment screw was fixed, micro-diamond scratch the surface of head region was made at constant load and then was observed central region and periphery of fine trace through 1000 times with FESEM. Results: The surface of GoldTite was smoother than that of other kinds of screw and had abundant ductility and malleability compared with titanium and gold screw. The scratch test also showed that teflon particles were exfoliated easily in screw coated with teflon. Titanium screw had a rough surface and low ductility. Conclusion: It was recommended that the clinical use of gold-plated screw would prevent a screw from loosening. CLINICAL IMPLICATIONS Clinical use of gold-plated screw would prevent a screw from loosening because it had abundant ductility and malleability compared with titanium and gold screw.

• 한국재료학회지
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• 제31권3호
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• pp.150-155
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• 2021

Zinc oxide (ZnO) based transparent conducting oxides (TCO) thin films, are used in many applications such as solar cells, flat panel displays, and LEDs due to their wide bandgap nature and excellent electrical properties. In the present work, fluorine and aluminium-doped ZnO targets are prepared and thin films are deposited on soda-lime glass substrate using a RF magnetron sputtering unit. The aluminium concentration is fixed at 2 wt%, and the fluorine concentration is adjusted between 0 to 2.0 wt% with five different concentrations, namely, Al2ZnO98(AZO), F0.5AZO97.5(FAZO1), F1AZO97(FAZO2), F1.5AZO96.5(FAZO3), and F2AZO96(FAZO4). Thin films are deposited with an RF power of 40 W and working pressure of 5 m Torr at 270 ℃. The morphological analysis performed for the thin film reveals that surface roughness decreases in FAZO1 and FAZO2 samples when doped with a small amount of fluorine. Further, optical and electrical properties measured for FAZO1 sample show average optical transmissions of over 89 % in the visible region and 82.5 % in the infrared region, followed by low resistivity and sheet resistance of 3.59 × 10-4 Ωcm and 5.52 Ω/sq, respectively. In future, these thin films with excellent optoelectronic properties can be used for thin-film solar cell and other optoelectronics applications.

• Korean Journal of Acupuncture
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• 제37권4호
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• pp.253-261
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• 2020

Objectives : This study aimed to evaluate adverse outcome associated with acupotomy and compare it with that of acupuncture. Methods : We retrospectively analyzed the chart records of 71 patients who received acupotomy at Daemyung Korean medical clinic from January 7, 2020 to March 6, 2020. We divided the acupotomy treatment area into 10, including the head, hand, chest, knees, shoulders, low back, neck, upper extremities, thighs, and feet. Furthermore, we investigated the adverse effect of acupotomy on those areas after treatment. Data were analyzed using descriptive statistics, and frequency analysis. Results : 'Bruise of specific region' accounted for the largest portion with 29 cases, followed by 24 cases of 'feeling tired and sleepy' and 17 cases of 'itch'. There were 16 cases of 'sustained pain' at the area of treatment, 11 cases of 'fatigue', 5 cases of 'swelling', 5 cases of 'dizziness', 4 cases of 'hematoma'. There were 3 cases of 'vertigo' and 2 cases of 'parathesia' and 'wide bruises', 'headache', 'gastric discomfort', 'bleeding', and 'skin rash' each. There was one case each that experienced 'unclear pronunciation', 'nausea', 'abnormal sweating', 'vomiting' and 'emotional/psychological reactions'. Conclusions : Adverse outcomes associated with acupotomy were mostly 'bruise of specific region', 'feeling tired and sleepy', 'itch', 'sustatained pain', and 'fatigue'. However, no adverse outcome or irreversible damage that have a serious effect on the body were observed.

• Journal of Acupuncture Research
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• 제39권1호
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• pp.36-39
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• 2022

Background: Acupotomy is a type of acupuncture where a scalpel-shaped needle (miniscalpel needle) is used instead of a normal acupuncture needle to exfoliate adhesion sites or to relax entrapped regions. This study aimed to identify the descriptive characteristics of patients who received acupotomy treatment at a single Korean Medicine Clinic. Methods: This retrospective review analyzed the medical charts of patients who had received acupotomy at least once from August 2017 to December 2019 at a single Korean Medicine Clinic. The demographic characteristics, chief complaints, acupotomy treatment sites, and principal diagnosis codes were analyzed. Results: We identified 551 outpatients; the average age was 52 ± 14.26 years and 49.9% were male. The patients underwent an average of 8.47 sessions of acupotomy. Altogether, 35.91% of the acupotomy treatments were administered to the spinal regions, of which 60.01% were in the lumbar region. The codes related to the lumbar spinal condition/disease which were used most frequently. The chief complaints were dizziness, lumbar spinal stenosis, and Dupuytren's contracture in patients over 60 years of age. Conclusion: This is the 1^st analysis of acupotomy treatment patterns in Korea to date. Acupotomy is primarily administered in the treatment of spinal conditions/diseases, especially for those involving the lumbar region. Future studies are necessary to determine the clinical outcomes of patients who receive acupotomy treatment and the safety of this treatment.

• 한국식품영양과학회지
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• 제32권4호
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• pp.555-561
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• 2003

본 연구는 전국의 646세대 가정주부를 대상으로 김장김치 제조시 사용하는 부재료 및 젓갈의 종류, 계절별 가정에서 주로 애용하는 김치류, 일일 김치 소비량 등을 조사함으로써 지역적으로 다양한 겨울철 김장김치 맛에 영향을 줄 수 있는 요인을 분석하여 지역적 특성을 살린 시판김치의 산업화를 위한 기초자료로 이용되고자 실시하였다. 김장김치 담금시 고춧가루, 마늘, 생강, 파, 깨, 설탕, 풀(죽) 등 7종의 부재료의 사용빈도가 지배적이었으며, 굴, 새우 등의 해산물은 충청북도를 제외 한 모든 지역에서 사용빈도가 높았다. 젓갈류에서 새우젓이 전국적으로 높은 사용빈도를 보였고, 멸치젓과 멸치 액젓이 그 다음으로 많이 이용되는 것으로 나타났다. 계절별 애용되는 김치로는 봄철에는 파김치, 부추김치, 여름에는 열무, 오이소박이, 가을에는 총각김치와 가을배추겉절이, 겨울철에는 동치미가 있었으며, 남부지역은 파, 부추김치 등의 자극성이 강한 김치류가, 중부지역은 자극성이 적고 담백한 나박김치가 선호되었다. 대부분의 가정에서 김장김치를 직접 담그고 있었고, 봄에는 파김치와 무말랭이를, 여름에는 오이소박이와 깻잎김치, 가을에는 고구마줄기, 겨울에는 고들빼기와 같이 한번씩 입맛을 돋울 수 있는 김치를 사먹는 것으로 나타났다. 20~30대에서는 6~10포기의 김치를 담는 경우가 33.3~35.8%로 가장 많았고, 40~50대는 16~20포기, 50대 이상에서는 40포기 이상을 담는 경우가 많았다. 그리고 가정에서 1일 김치소비량은 1/8~1/4포기가 가장 많았고(42.7%), 개인당 1일 소비량으로 환산하면 80 g미만이 33.1%로 가장 많았다.

• 한국환경보건학회지
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• 제34권1호
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• pp.27-33
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• 2008

In order to evaluate the magnetic field (MF) exposure level in residential areas near high voltage power lines, this research measured MF levels at 120 sites near high voltage transmission lines in the Busan region, Gwangju region, Daegu region and Changwon region from July to December, 2005, and compared and analyzed the efficiencies by measuring and applying the MF emission levels of underground cables and high voltage transmission lines. As a result of the investigation of the MF exposure level by the building usage, the average MF level of 17 locations at schools was $2.44{\pm}2.45mG;$ that of 10 locations at hospitals $6.21{\pm}12.39mG;$that of 76 locations at apartments $2.55{\pm}2.98mG;$ and that at kindergartens and infant houses $3.32{\pm}4.21mG$. MF exposure was analysed as a function of distance from the source and the MF levels directly below a source were $5.15{\pm}8.72mG$, those within 30 m were $3.10{\pm}3.32mG$, while those within 50 m were $2.45{\pm}2.38mG$, and within 100 m were $0.71{\pm}0.93mG$. In order to determine the difference of MF levels by the actual distance from high voltage transmission line within the same building, the evaluation of the floor position and the MF level has shown that the MF levels were highest in the order of roof, 4th floor, 3rd floor, 2nd floor and 1st floor. Comparison of MF emission intensity of underground cables and high voltage transmission lines, has shown that underground cables have an 86-94% of reduction ratio in MF compared to high voltage transmission lines, thus demonstrating higher efficiency.

• 한국지리정보학회지
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• 제26권4호
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• pp.1-16
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• 2023

2005년에 전국적으로 10개 혁신도시의 위치 선정이 완료되었으며, 2013년부터는 공공기관이 혁신도시로 이전하기 시작하였다. 국토의 균형발전을 위해 시행되었던 정책이니만큼 지역에서 기대도 작지 않았다. 하지만 혁신도시 건설로 이전해 오는 인구는 늘었지만 과연 수도권에서 얼마나 유입되는지, 그리고 국토 공간적으로 어떤 특징이 있는지 분석해 봄으로써 혁신도시가 제대로 그 역할을 하는지를 알아보고, 향후 혁신도시의 정책방향을 재검토해 보고자 한다. 이에 본 연구에서는 통계청의 MDIS(Microdata Integrated Service)를 이용하여 2013년부터 2021년까지 혁신도시에서 인구이동의 공간적 특성을 분석하였다. 총 10개 혁신도시 중 기존 시가지에 건설되어 혁신도시만의 인구 데이터 구축이 어려운 경우를 제외하고 3개 혁신도시만을 대상으로 분석해 보았다. 그 결과 혁신도시 개발 초기에는 수도권으로부터의 인구 유입이 많아 수도권 인구분산과 국토균형 발전에 일부 효과가 있었으나 시간이 지남에 따라 오히려 수도권으로 다시 유출되는 인구가 더 많아지는 현상이 나타나 문제점으로 지적된다. 또한 경북혁신도시와 광주전남혁신도시는 전입사유, 세대주연령, 세대원수 등에서 유사하였지만 경남혁신도시와 다른 특징이 나타났다. 그 이유는 다양하겠으나 현재 상태로는 혁신도시를 통해 '균형있는 국토발전' 목표를 달성하기 한계에 도달했으므로 지역 특성을 고려한 혁신도시 개선 방안 마련이 필요하다. 아울러 최근 논의되고 있는 제2차 공공기관 이전 계획도 이와 같은 문제를 반복하지 않기 위해 보다 신중하게 설계되어야 할 것이다.