에어컨 냉각 팬용 브러쉬레스 DC 전동기의 역기전력 분석에 대한 연구

조정현,김지현,정정원,황흥식,이치우 경성대학교 공학기술연구소 2012 공학기술연구지 Vol.18 No.-

Compared to conventional dc motors having the combination of commutators and brushes, a brushless DC (BLDC) motor is one of the highly efficient motors due to its electrical commutation without a brush, and this feature allows the BLDC otor to be more suitable for an application requiring no maintenance due to mechanical wear between a commutator and a brush. Also, the BLDC motor has a few benefits over both a dc motor and an induction motor such as high dynamic response, high efficiency, logn life span, and low noise in wide speed-torque region. This paper investigates the variation of voltage induced in phase windings in a BLDC motor in several cases with respect to stack length, steel grade, and coil material. This study is numerically conducted and it is verified from the theoritical point of view by comparing the result of simulation with that of experimental measurement.

FCT 5 : Fractional laser-assisted topical imiquimod 5% cream treatment for recalcitrant common warts in children

( Hyun Chang Ko ),( Jeong Min Kim ),( Hyun Ho Cho1 ),( Won Jeong Kim ),( Je Ho Mun ),( Margaret Song ),( Hoon Soo Kim ),( Byung Soo Kim ),( Moon Bum Kim ) 대한피부과학회 2013 대한피부과학회 학술발표대회집 Vol.65 No.2

Background: Conventional destructive modalities for warts like cryotherapy or laser ablation have some limitations that are excruciating pain during procedure, in especially pediatric patients. Imiquimod is a topical immune response modifier that was approved for treating genital and perianal warts. But, thick stratum corneum of common warts may act as a barrier against drug permeation via the skin. Objectives: To evaluate efficacy and safety of above treatment. Methods: Eleven pediatric patients (6 female and 5 male, mean age 12.5 years) were included in this study. The lesions were treated by fractional 2940 nm Er:YAG laser for achieving the penetration of stratum corneum with 1 or 2 weeks intervals. Then, imiquimod 5% cream was self-applied once daily for 5 days a week. Assessment of response and adverse effects was performed every 2 weeks until complete clearance or up to maximum of 48 weeks. Pain during procedure was checked by VAS (0-10). Results: 8 out of 11 (72.7%) patients experienced complete clearance of all warts lesions. Mean duration of total treatment was 29.7 (16-48) weeks. Mean number of fractional laser treatment was 17.5 (8-37) times. No significant adverse effect was observed. VAS score of the pain during fractional laser treatment was 2.4 (1-4), comparing with 6.2 (5-8) during cryotherapy. Conclusion: Fractional ErYAG laser-assisted topical 5% imiquimod cream is an effective and safe treatment option for recalcitrant common warts of the children do not tolerate pain well.

Solubility of TiO2 in NaF‑CaF2‑BaF2 Melts

Jeong‑Hyun Yoo,Sung‑Wook Cho 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.6

The solubility of TiO2in NaF-CaF2-BaF2 ternary eutectic melts was investigated at the temperature range of 1025–1150 °C. The least-squares equation was obtained from the relationship between the reciprocal temperature and the natural logarithm ofthe titanium concentration in the melts saturated with TiO2. The corresponding partial molar enthalpy of dissolution of TiO2was found to be 188 kJ/mol. The titanium saturation concentration was 3.73 wt% at 1100 °C. From the titanium concentrationchange with the added amount of TiO2at different holding time after a final stirring, it was found that not only completedissolution of TiO2but also enough sedimentation of excessive TiO2should be guaranteed to obtain more reliable solubilitydata. The holding time of 10 h was found to be enough for the excessive TiO2particles to settle down in our experimentalconditions. It is noteworthy that in case of adding TiO2in excess of its solubility, the Ba1.12(Ti8O16) phase was observed atthe lower and bottom of the solidified salt ingots.

麻黃의 사람 비점막 섬유아세포 monocyte chemotactic protein 중 MCP - 1 , MCP - 2 , 및 MCP - 3 분비에 대한 효과

김현미,이향숙,김정선,조정제,유영천,안현종,최훈,임강현 대한본초학회 2002 大韓本草學會誌 Vol.17 No.1

Recent reports have proposed that Ephedrae Herba may modulate the immune response on allergy or asthma. Human nasal mucosal fibroblasts are a rich source cytokines, inflammatory mediators, and chemokines. Chemokines are important for the recruitment of leukocytes to sites of infection, which is essential in host defense. Objectives : The objective of this study was to investigate the effect of Ephedrae Herba on the release of the chemokines such as monocyte chemotactic protein(MCP)-1, MCP-2, and MCP-3 in human nasal mucosal fibroblasts after stimulation with cytokines like tumor necrosis factor -α(TNF-α), interferon-γ(IFN-γ), and interleukin -1β(IL-1β).

반하후박탕(半夏厚朴湯) 추출물이 생쥐에 유발된 심리적 스트레스에 미치는 영향

임세현 ( Se Hyun Lim ),정현윤 ( Hyun Yun Jeong ),원호영 ( Ho Young Won ),김형우 ( Hyung Woo Kim ),최창원 ( Chang Won Choi ),정향숙 ( Hyang Sook Jeong ),김영균 ( Young Gyun Kim ),조수인 ( Su In Cho4 ) 대한본초학회 2012 大韓本草學會誌 Vol.27 No.4

Objective : Banhahubak-tang is indicated for globus hystericus, marked by a subjective sensation as if something stuffed in the throat, chest distress, cough or vomiting, greasy whitish, taut and smooth pulse. In this study, the effects of Banhahubak-Tang extract (BHTe) were tested for anti-stress action. Methods : BHTe was extracted by pure water using electronic extractor and then fed to ICR male mice (20±2g) orally with the dose of 100㎎/㎏/day for five days. Mice were exposed to sociopsychological stress by restraining and seeing foot shock stressed mice for one hour for five days. Results : BHTe administered group showed a tendency of decreasing of serum corticosterone secretion when compared with control group, and BHTe administration also significantly up-regulated noradrenaline secretions in the dorsal cortex of brain. Lipid peroxidation of the brain tissues of mice were tested by measuring malondialdehyde, but BHTe showed no significant change. The elevated plus-maze test was designed to detect the effect of anxiolytic drugs, and BHTe administered group showed a significant increase of latency time. Conclusions : These results suggest that BHTe can effectively rid the psychological stress and it`s related diseases.

40세 이하 관상동맥 질환자에서 장기적 임상 관찰

이승욱,정명호,박종철,박형욱,조상희,김원,김계훈,이상현,강경태,조장현,김남호,김건형,안영근,조정관,박종춘,강정채 全南大醫大 2001 전남의대학술지 Vol.37 No.2

쌍태아에서 제 1태아의 분만 후 제 2태아의 지연분만 : 중례보고

김주환,서민정,유희정,노권일,조대현,박정규,이정헌,조성남,손영수 朝鮮大學校 附設 醫學硏究所 2005 The Medical Journal of Chosun University Vol.30 No.3

With the widespread use of fertility medications and techniques of in vitro fertilization, multiple gestation has become epidemic in modern obstetric practice. Delivery of the initial fetus in a multiple gestation usually is followed by delivery of the subsequent fetus or fetuses shortly thereafter. However in rare circumstances, the delivery is delayed for days due to disappearance of uterine contraction after delivery of the first fetus. When uterine activity ceases after the delivery of the first neonate, a policy of nonintervention may be considered in case of an immature or very premature delivery, in order to achieve a gestational age for the remaining fetus(es) more compatible with neonatal survival. We report a case of twin gestation with prolongation of the delivery interval between the twins for 46 days.

21세기를 향한 국가기술자격제도의 발전방안 연구 : New Directions Towards the 21st Century

조정윤,박종성,김현수 한국산업교육학회 1999 산업교육연구 Vol.6 No.-

21세기를 대비한 국가기술자격제도의 발전 방안을 국가 경쟁력 확보 측면에서 모색하기 위해 이 연구에서는 국제 경제 환경 변화에 따른 주요국의 자책제도 대응 방향을 살펴봄으로써 우리나라 국가기술자격제도에 반영해야 할 시사점을 도출하였다. 이와 함께 국가기술자격제도의 운영 실태를 파악하고 자격제도에 관한 요구를 파악하기 위해서 39개 기관을 방문하여 넓은 의미의 국가기술자격 관리자들을 대상으로 면담조사를 수행하였고, 기 국가기술자격 취득자 480명을 대상으로 설문조사를 실시하여 의견을 수렴하였다. 이상의 연구를 통해 21세기를 향한 국가기술자격제도의 발전 방향을 기술·기능 분야의 합리화 방안, 서비스 분야의 합리화 방안, 자격 취득자의 사회적 우대 방안, 자격 정보체제구축 방안, 기초직업능력과의 연계 방안, 민간자격으로 관리·운영의 전환 방안, 국제적 통용성 확보 방안, 통합 국가자격체제 구축 방안으로 나누어서 제시하였다. There are strong links between a nation's economic prosperity, its international competitiveness, and the competency of its population. As international competition intensifies and the rate of economic and technological change accelerates, advanced countries increasingly strive to improve their competitiveness by reforming their national qualification systems. With the advent of the information age and the knowledge- based society, human resource development has become a key factor in determining a nation's competitiveness. And technological qualificatior systems have a direct and significant influence on human resource development. In order to guarantee Korea's continued development as a competitive member of the international community, it is demanded that a Korean Technology Qualification System(KTQS) be established to set Ae nation's future course for the 21st century. Extensive and concrete development plans for KTQS in 21st centry are as follows: First of all, it is essential tc prepare policies for improving the effectiveness and suitability of KTQS and its operations as they apply to the domains of technology and craft. Second, in terms of the service fields, policy measures should be taken to improve and guarantee the diversity of qualification items. Third, appropriate policy measures should be taken in order to raise the general social status of NTQ holders. Fourth, policies should be introduced which will allow for the enhancement of generic competency under the qualification system. Fifth, appropriate policies should be prepared to facilitate a partial transition from a state-run qualification system to a private system. Sixth, with the recent development of international agreements on profession qualifications, it is important to guarantee that Korean qualifications have a common, international currency. Finally, it is imperative that policies be prepared which can establish the necessary foundations for the unification of national qualifications under a single NQ.

1997년 포항지역에서 유행한 소아 무균성 뇌막염의 임상상

조성민,김나연,정진화,김수근,임현술 동국대학교 의학연구소 1998 東國醫學 Vol.5 No.-

1997년 포항지역에서 유행한 소아 무균성뇌막염의 임상상을 고찰하고 이 질환의 발생과 환자가 당시에 사용하던 식수와의 관계를 알아보기 위하여 1997년 5월부터 1997년 10월까지 동국대학교 의료원 포항병원소아과에 내원하여 무균성뇌막염으로 진단 받은 78명의 환아들을 대상으로 의무기록의 후향적 분석 및 식수에 관한 전화 조사를 실시하였다. 환아의 남녀비는 1.23:1이었으며 5-6세군에서 가장 많았다. 월별 분포는 5월에 시작하여 10월까지 발생하였으나 6월과 9월에 점유율이 높았다. 임상 증상 및 증후로는 발열이 가장 많았고(96.2%), 구토(89.7%), 두통(84.6%), 경부강직(73.1%), 인두 발적(71.8%), 식욕부진(52.6%) 등의 순으로 나타났다. 혈액검사 소견으로 백혈구수가 10,000/㎣ 이상으로 증가한 경우가 54.5%였고, 혈침치가 20mm/h 이상인 경우가 29.0%였으며, C반응단백이 0.5mg/dl 이상인 경우가 84.1%였다. 뇌척수액 검사소견은 백혈구수가 13-860/㎣으로 평균 241.2/㎣였고, 단백량은 평균 78.4mg/dl, 당량은 평균 70.8mg/dl였다. 합병증이나 후유증이 발생한 경우는 없었다. 발병 당시의 식수에 관한 전화 조사는 46명에서 가능하였는데 생수를 끓이지 않고 먹는 경우가 13명(28.3%), 생수를 끊여 먹는 경우가 11명(23.9%), 상수를 끓이지 않고 먹는 경우는 2명(4.3%), 상수를 끓여 먹는 경우는 20명(43.5%)으로 전체적으로 보면 물을 끓여 먹는 경우가 31명(67.4%), 물을 끓이지 않고 먹는 경우는 15명(32.6%)으로 나타났다. 본 조사에서는 무균성뇌막염이 발생하지 않은 대조군의 설정이 되지 않았고, 표본의 크기가 매우 작으며, 식수 이외의 물을 통한 전파에 관한 조사가 이루어지지 않아 본 조사 자료만으로는 무균성뇌막염의 발생과 식수와의 관계를 밝히기 어려웠다. 이를 밝히기 위해서는 지역 주민을 대상으로 한 역학조사와 무균성뇌막염이 유행할 당시에 식수 및 식수 이외에 사용하는 물에 대한 역학 조사 및 바이러스 검사 등이 필요할 것으로 생각한다. This study was performed to evaluate the clinical features of aseptic meningitis in Pohang City in 1997 and its relationship to drinking water. We reviewed the clinical records of 78 aseptic meningitis patients who had been admitted to Dongguk University Pohang Hospital, and investigated the drinking water of patients by telephone survey. The results were as follows: 1) The ratio of male to female was 1.23:1. 2) The aseptic meningitis occurred in children of all age groups, but was most prevalent in 5-6year old children. 3) All the cases developed from May to October, but they showed two peaks in June and September. 4) Fever was the most common clinical manifestation(96.2%), followed by vomiting(89.7%), headache(84.6%), neck rigidity(73.1%), pharyngeal injection(71.8%), and anorexia(52.6%). 5) On admission leukocytosis(WBC > 10,000/㎣) on peripheral blood was showed in 64.5%, and increased erythrocyte sedimentation rate(≥ 20 mm/h) in 29.0%, and increased C-reactive protein(≥ 0.5 mg/dl) in 84.1%. 6) On CSF examination, leukocyte count was in the range of 13 to 860/㎣ (mean 241.2/㎣), protein in the range of 0 to 253 mg/dl(mean 78.4 mg/dl), and glucose in the range of 35 to 115 mg/dl(mean 70.8 mg/dl). 7) There was no case who developed any complication. 8) On the telephone survey about the drinking water, we were able to do the survey in 46 cases, raw underground water was used in 13 cases(23.8%), boiled underground water in 11 cases(23.9%), raw tap water in 2 cases(4.3%), and boiled tap water in 20 cases(43.5%). We could not identify the close relationship between the drinking water and aseptic meningitis because of the small sample size, the absence of control group, and the difficulties in the study of past event. Epidemiologic and virologic studies of drinking water will be necessary.

社會科의 成就度와 民主市民意識과의 關係

조현걸,추정훈 金烏工科大學校 1993 論文集 Vol.14 No.-

This study is tried for the purpose of inquiring about relation of achievement level of social studies(political part) in high school to democratic citizenship. We expect that it will contribute a basis to building of contents and goal-study of current social studies under the system of enterance-examination. Hypotheses of this study are as follows. Hypothesis 1 : The higher achievement of social studies is the higher democratic citizenship is. Hypothesis 2 : If the same achievement, level of democratic citizenship of girl-students will be higher than that of boy-students. In order to test these hypotheses. We sampled 98 students in A high school purposively, surveyed through questionnaire, analyzed date by spss/pc. In result, <hypothesis 1> is supported(p=0.0001) and <hypothesis 2> is rejected(p=0.106).