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.

LAG SCREW PLATE를 이용한 하악골 과두부 골절 환자의 치험례

김기영,허종기,박광호,김형곤 大韓顎顔面成形再建外科學會 1998 Maxillofacial Plastic Reconstructive Surgery Vol.20 No.1

개에서 발생한 다중심성 T 세포 림프종 증례

이기호,박형진,송근호,서경원 忠南大學校 獸醫科大學 附設 動物醫科學硏究所 2012 動物醫科學硏究誌 Vol.19 No.1

A 5-year-old Jindo dog (13.7 kg, intact female) with history of cervical mass was referred to the Veterinary Medical Teaching Hospital of Chungnam National University. Complete blood cell count showed mild anemia thrombocytopenia. And serum biochemistry showed increased ALP. On radiologic evaluation, multicentric lymph nodes' enlargement. Based on the findings, the dog was diagnosed as multicentric T-cell lymphoma. The dog was treated with LCOAP-short protocol, but survived 7 months since first finding.

Human Chorionic Gonadotropin(HCG)에 의한 넙치, Paralichthys olivaceus의 배정효과

박인석,김형배,최희정,이영돈,손진기 제주대학교 해양연구소 1992 해양자원연구소연구보고 Vol.16 No.-

For the evaluation of hormonal control of sperm in cultured fish a method to quantify the spermiation response of mature flatfish to hormonal therapy is described. Spermatocrit was determined after 30 min. in centrifuge condition of 12,000rpm. Sperm density was estimated by a standard hemacytometer method. However, sperm density can be predicted from spermatocrit since their relationship is linear as described by the re-gression equation. Y=1.14X-0.04 (r=0.91. P<0.0001. n=50), where Y is spermatocrit and X is sperm density. Sperm density levels ranged from 21.5 to 98.4×10^(4) spermatozoa per ㎕ milt corresponding to spermatocrit values of 12 to 95%. Milt production by mature flatfish was highest (7.4ml per kg body weight) at 24h after injection of 1,000IU of human chorionic gonadotropin(HCG) per kg body weight and coincided with low spermatocrit (63%) and sperm density (67.4×10^(4) spermatozoa per ㎕ milt) levels. No significant differences was appeared in milt production, spermatocrit and sperm density between control and HCG-treated fish at 48h after HCG injection. These results demonstrate that spermiation in mature flatfish can be reliably evaluated by a spermatocrit method and that HCG is effective in stimulating of spermiation in this species.

구조화 표본추출을 이용한 핀의 최적설계에 관한 연구

박홍준,김기형 朝鮮大學校 機械技術硏究所 2001 機械技術硏究 Vol.4 No.2

The Taguchi method by orthogonal array, one of the structured sampling methods, has many advantages which are row cost and time saving for experiments and researches. But this method has applied limited area especially about mechanical problems. So, we experimented whether the structured sampling is useful to apply optimal design of mechanical elements. First, we made a mechanical problem to determine optimal parameters of a pin with a hole. The second, we calculated combination of optimal parameters by simulation. At the same time, we seeked optimal combination by structured sampling using orthogonal array and ANOVA. The last, we compared these two results. The experimental result have shown that the structured sampling method seeked optimal parameters exactly. So, we see some possibility in this application.

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.