Comparison of the Crystallization Behavior of Silica Between Mg and Al‑Phosphate Used in Tension Coatings of Grain‑Oriented Electrical Steel

Hyung‑Ki Park,Min‑Soo Han,Chang‑Hwan Chang,Jong‑Tae Park,박창수,Hyung‑Don Joo 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.3

The effect of the phosphate component on the thermal stability of tension coatings was investigated with a focus on thecrystallization behavior of amorphous silica in the tension coating. After stress-relief annealing, core loss of samples coatedwith a Mg-phosphate was improved, while that coated with an Al-phosphate was deteriorated. The domain wall spacing ofthe samples coated with Mg- and Al-phosphates was respectively increased and decreased after stress relief annealing. Thismeans that the stress relief annealing did not much diminish the tensile stress for Mg-phosphate coating but much diminishedthe tensile stress for Al-phosphate coating. Based on FTIR and XRD results, we found that the crystallization temperatureof silica with Al-phosphate was lower than that of silica with Mg-phosphate. The crystallization of silica was accompaniedby an abrupt volume change, which formed cracks in the tension coating and deteriorated the tensile stress.

연속적인 제어를 이용한 카오스 동기

안기형,박현규,박재형,양기철,최부귀 東亞大學校 附設 情報通信硏究所 1997 情報通信硏究所論文誌 Vol.5 No.1

The control of Chaos system is difficult because the system has characteristics of nonlinear and unstable. In this paper, we confirm synchronization between transmitting and receiving systems using Chua's circuits. This system is controlled by negative feedback, continuously.

Insulation Coating of Fe–Si–Cr Soft Magnetic Powder by Selective Oxidation

Jae‑Young Park,Kwangsuk Park,Bosung Seo,Julien O. Fadonougbo,Tae‑Wook Na,Ki Beom Park,Hyeon‑Tae Im,Nong‑Moon Hwang,Hyung‑Ki Park 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.7

This study examines the insulation coating technology of Fe–Si–Cr powder via selective oxidation annealing, which oxidizeselements selectively by controlling the oxidation potential. The study calculated the oxidation driving force of Fe, Si, andCr, and conducted a thermodynamic analysis of oxidation and reduction conditions according to temperature and oxidationpotential. Based on the results, a selective oxidation annealing was performed in an atmosphere in which Fe is reduced andonly Si and Cr are selectively oxidized. The oxidation potential was controlled through the partial pressure ratio of hydrogenand water vapor. The XPS analysis results confirmed that a Si and Cr complex oxide layer formed on the powder surfaceafter the selective oxidation annealing. Afterward, withstanding voltages were analyzed to evaluate the insulation property. Then, the withstanding voltage of the powder applying the selective oxidation annealing increased significantly comparedto that of the initial powder. Further analysis showed that the powder annealed in an air atmosphere had a significantly lowersaturation magnetic flux density than the initial powder, while the powder applying the selective oxidation annealing hadonly a slightly reduced saturation magnetic flux density.

비강 및 비인두에 발생한 도립유두종과 편평상피암종의 p53단백 및 세포증식능에 관한 연구

한주호,윤기중,이재규,신대균,박근호,조향정,문형배 圓光大學校 醫科學硏究所 1996 圓光醫科學 Vol.12 No.2

The inverted papilloma and squamous cell carcinoma are common neoplasia in the sinonasal cavity and nasopharynx, but the incidence of these tumors are very low and the study on the oncogenesis or biological activity of the tumor cells are not well known. This study was designed to evaluate the oncogenic roles of the p53 gene and the proliferative activity of the tumor cells in the inflammatory polyp, inverted papilloma and squamous cell carcinoma. The experiment was carried by the immunohistochemical stains about the p53 protein, PCNA and Ki-67, histochemical stain about the AgNORs. and flow cytometric analysis about the DNA ploidy using the formalin fixed paraffin embedded tissues. The frequency of the expression of p53 protein was 0%(0/16 cases) in the inflammatory polyps, 18.8% (3/16 cases) in the inverted papillomas, and 87.5%(14/16 cases) in the squamous cell carcinomas. The labelling index(%) of the PCNA and Ki-67 was 5.3% and 3.3% in the inflammatoy polyps, 29.6% and 25.2% in the inverted papillomas, and 51.9% and 36.8% in the squamous cell carcinoma. The expression of the PCNA and Ki-67 was distributed in the periphery of the tumor islands of the inverted papilloma and was distributed in the both of center and periphery of the tumor islands of the squamous cell carcinoma. The number of nuclear AgNORs was increased in the order of inflammatory polyps (0.96), inverted papillomas(1.34) and squamous cell carcinoma(2.09). The frequency of the DNA aneuploidy was 0%(0/16 cases) in the inflammatory polyps, 18.8%(3/16 cases) in the inverted papillomas. and 12.5%(2/16 cases) in the squamous cell carcinomas. Above results indicates that the changes of the p53 gene and proliferative activity of the tumor cells are involved on the oncogenesis and the biological activity of the inverted papilloma or squamous cell carcinoma in the nasopharynx and sinonasa cavity.

제3분과 : 야생동물 ; 국립공원 산불통제구간내 야생동물 서식현황 분석 -지리산국립공원 노고단~피아골계곡을 중심으로-

강병선 ( Byung Seon Kahng ),박기연 ( Ki Yeon Park ),김은창 ( Eun Chang Kim ),이재윤 ( Jae Yoon Lee ),지기선 ( Ki Seon Ji ),최형진 ( Hyung Jin Choi ),오현경 ( Hyun Kyung Oh ) 한국환경생태학회 2013 한국환경생태학회 학술대회지 Vol.2013 No.1

우리나라 전 국토의 6.58%를 차지하고 있는 국립공원은 생태계 현황을 대표하는 지역으로 한국에 서식하는 생물종 39,150종 중 40%에 해당하는 15,727종이 서식하고 있다(국립공원관리공단, 2012). 특히 환경부에서 지정한 멸종위기종 221종 중에서 65%에 해당하는 144종이 서식하고 있어 인간의 간섭 및 개발압력으로부터 마지막 피난처의 중요한 역할 또한 수행하고 있다. 국립공원은 자연생태계와 자연 및 문화경관 등을 보전하고 지속가능한 이용을 도모함을 목적으로 하는 자연공원법에 의하여 지정되는 자연공원의 하나로서 자연생태계의 보전뿐만 아니라 지속가능한 이용 또한 고려되어야 한다. 즉, 생물종 서식처의 보존 뿐만 아니라 탐방객의 이용 또한 고려되어야 하며 이를 위해서는 생물종의 서식현황 분석은 반드시 선행되어야 할 과제이다. 그러나 생물종이 다양하고 서식처가 광범위하여 종의 전체적인 서식현황을 분석에는 많은 시간과 비용이 수반된다. 따라서 시간과 공간이 제한되는 산불조심기간 중 산불통제 구간을 대상으로 야생동물의 서식현황을 분석해 보고자 하였다. 아울러 구례군 지역에 서식하는 야생동물의 서식현황을 분석하여 보호지역 관리에 기초자료를 제공하고자 하였다. 월 1회 정기적으로 탐방로를 중심으로 야생동물의 식흔, 배설물 등 흔적을 2010년부터 2012년까지 최근 3년간 모니터링 하였으며, 모니터링 시 GPS 좌표 측점, 사진촬영, 주변환경조사 등을 병행하였다. 아울러 무인센서카메라를 10대 설치하여 실체를 확인하였으며, 조사된 자료는 GIS DB로 최근 3년간, 지리산국립공원 노고단~피아골계곡에서 조사된 야생동물 흔적은 124건으로 삵 59건, 담비 27건, 족제비 21건, 멧토끼 10건, 멧돼지 4건, 고라니 2건, 오소리 1건 등이었다. 이중 삵과 담비는 멸종위기종으로서 86건으로 발견종의 69%를 차지하고 있었다. 특히 봄과 가을철 산불통 제기간 중에는 월평균 19회 관찰되었는데 이는 다른 기간 평균 4회 보다 5배정도 많은 횟수로 탐방객의 출입이 제한되었을 때 위협요인이 감소됨으로서 서식여건이 보다 안정화되어 훨씬 많이 발견되고 있음을 알 수 있었다. 2010년부터 2012년 지리산국립공원 구례지역에서 조사된 야생동물 698건의 서식 분포특성을 분석한 결과 삵 286건, 담비 139건, 족제비 95건, 수달 53건, 오소리 30건, 멧돼지 30건, 멧토끼 29건, 너구리 16건, 고라니 13건, 노루 4건, 하늘다람쥐 3건 등이었다. 특히 멸종위기종인 삵, 담비, 수달, 하늘다람쥐 등이 481건으로 68%를 차지하고 있어 멸종위기 야생동물의 출현빈도가 매우 높음을 알 수 있었다. 최근 3년간 야생동물 서식현황을 분석한 결과 타기간 보다 산불방지기간에 출현빈도가 높아 탐방객의 출입에 따른 위협요인을 계량적으로 파악할 수 있었으며, 특히, 봄철 산불방지기간은 야생동물의 번식기라는 점에서 보다 안정된 서식처를 제공한다는 의의가 있을 수 있다. 또한 멸종위기종의 흔적이 전체종의 68%가 발견됨으로서 멸종위기종의 서식처를 제공하고 있음을 알 수 있었다. 향후 이러한 결과를 바탕으로 각 야생동물에 대한 서식처 분석과 더불어 이를 통한 관리방안이 수립될 필요성이 있다.

체육전공 대학생들의 건강에 대한 지식, 태도 및 행위간의 관련성 비교

박종성,이창근,유영규 명지대학교 예술체육대학연구소 2004 藝體能論集 Vol.15 No.-

The present writer carried out of a survey on physical education majors of some junior colleges to grasp their levels of health information and attitudes/behaviors to good health, and to compare and analyze the correlations between them with a view to developing health-improving programs for junior colleges, thereby affording a basic material for health guidance. The survey was conducted with questionnaires addressed to 567 male students and 263 female students of four junior colleges in Seoul and Kyeonggi province. As s result of statistical examination of the survey, the present writer has reached the following conclusions. 1. The level of health informaion obtained 14.98±4.54 points out of a possible 22, indicating 68.1% of correct information. There was no significant statistical difference between the information levels of male and female students. 2. The level of their attitude to health obtained 14.97±3.66 points out of a possible 22, indicating 68.0% of correct attitude. There was no big statistical difference between the attitude levels of male and female students. 3. The level of their behavioral action to good health obtained 10.56±3.52 points out of a possible 22, indicating on an average 48.0% of correct behavior. Regarding smoking, drinking,coffee intake, sexually transmitted disease, sexual relations, physical checkup, etc., female students indicaed by far the more desirable results than male students statistically. 4. In the comparison and analysis of correlations between the survey subjects' health information and attitudes/behaviors to good health, significant statistical difference were observed in the correlations between the subjects' health information attitudes(r=0.498, p<.01). 5. Comparing and analyzing the correlations between the survey subjects' health information and attitudes/behaviors to good health, the present writer has found more significant statistical correlations between their health information and attitudes(M:r=0.502,p<.01; F:r=0.497, p<0.1), attitudes and behavioral action(M:r=0.218, p<0.1; F:r=0.478,p<0.1),health information and behavioral action(M:r=0.203, p<0.1; F:r=0.349, p<0.1) of male students than of female students. In other words, compared with female students, male students failed to live up to their health information more frequently than female students. As This study was limited to the physical education majors of some junior colleges, a retional generalization cannot be deduced from the outcome of the survey. A survey is required, therefore, based on a larger scale. Again, since the basic health items were limited to eleven kinds, this study necessarily does not include all gealth problems; more comprehensive surveys are yet to be carried out. As a result of this survey, however, it was ascertained that there is relatively little correlation between the subjects' health information and their attitudes, attitudes and behavioral action, informaion and behavoioral action. Hopefully, health behavior-focused health education based on adequate health informaion should be carried out, instead of health guidance overemphasizing health information alone.

비디오 흉강경을 이용한 자연성 기흉 수술에서 재발 방지 방법에 대한 연구

박성강,이석기,임진수,최형호 朝鮮大學校 附設 醫學硏究所 2004 The Medical Journal of Chosun University Vol.29 No.1

Background : This study aims to assess the efficacy of VATS pleurodesis in the treatment of spontaneous pneumothroax. Method and material : 131 consecutive patients who underwent videoUassisted thoracoscopy (VATS) bullectomy and pleurodcsis procedure in Chosun Uniservity Hospital between May 1999 and June 2003 were included in the study. Theses patients were performed the VATS with Talc pleurodesis (Group A, n=72), VATS with Doxycycline pleurodesis (Group B, n=36), and VATS with reinforcement by absorbable mesh (Surgicel_(R)) and fibrin glue (Group C, n=23). The follow-up period was from 4 months to 30 years. Result: The patient's population consisted of 117 men and 14 women, and the mean age of the patients was 25.6 years. Recurrence rate was 1.4% ( 1 of 72 patients) in group A, 5.6% (2 of 36 patients) in groug B and 0% (0 of 23 patients) in group C. The median removal period of drainage chest tube was 3.3 days. Conclusion : Careful surgical technique is fundamental in reducing early air leakage and recurrence. Moreover, the covering of the suture area with an absorbable mesh and the fibrin glue is safe and effective method with an acceptable recurrence rate.

초정밀 평면 X-Y 스테이지의 시뮬레이션 및 제어성능 평가

박기형,김재열,곽이구 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.5

In this study, actuator, sensor, guide, power transmission element and control method are considered for ultra-precision positioning apparatus. Through previous process, single plane X-Y stage with ultra-precision positioning is manufactured. Global stage for the purpose of materialization with robust system, is combined by using AC servo motor and ball screw and rolling guide. And ultra-precision positioning system is developed by micro stage with elastic hinge type and piezo element. global serve and micro servo for the purpose of materialization positioning accuracy with nm(nanometer) are controlled simultaneously by using incremental encoder and laser interferometer as displacement measurement sensor. Through previous process, ultra-precision positioning system(100mm stroke and ±10nm positioning accuracy) with single plane X-Y stage are materialized.

腦硬塞患者의 血壓·脈搏 및 腦血流에 대하여 水溝-承漿穴 電鍼刺戟이 미치는 影響

박성욱,문상관,고창남,조기호,김영석,배형섭,이경섭 경희대학교 1997 慶熙醫學 Vol.13 No.4

포스트-텐션 프리캐스트 외부 넓은 보-기둥 접합부의 비탄성 거동

박상욱,최윤철,김영찬,김대중,임재형,권기혁,문정호,이리형 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

Experimental results from the cycle lateral load tests for post-tensioned precast wide beam-column connections were presented. Six exterior beam-column assemblages of half scale were tested in the laboratory. The specimens consist of U-shaped precast wide beams and concrete columns. The continuity at the beam-column joint is achieved with the topping concrete and post-tensioning. The specimens were designed with parameters of the beam-to-column depth ration and the number of tendons within column core. The test results showed that the post-tensioned precast wide beam-column connection satisfied the provisional standard by ACI of acceptance criteria for concrete special moment frames.