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.

강원도 화천군 수달(Lutra lutra) 서식지의 식생 구조

서형수 ( Hyung Soo Seo ),신영섭 ( Young Seob Shin ),이경은 ( Kyung Eun Lee ),김윤미 ( Yoon Mi Kim ),전미나 ( Mina Jeon ),남택우 ( Taek Woo Nam ),한성용 ( Sung Yong Han ),정연숙 ( Yeonsook Choung ) 한국하천호수학회 2014 생태와 환경 Vol.47 No.special

In order to determine whether vegetation would be one of the factors for the selection of otter home range, vegetation structure and other potential factors were studied in Hwacheon, Korea. Thirteen sites, otter’s activity found and not found, were investigated in North Han River and connected tributary streams of Hwacheon-gun. Three types of vegetation were classified by cluster analysis, which is short grass, tall grass and shrub type. Vegetation zone of each channel is composed of either one type, or mosaic of tall grass and shrub type. Short grass type is common in Lake Paro and upper North Han-river where water level is highly variable throughout a year. Therefore, annual species such as Persicaria nodosa, Fimbristylis dichotomam and Chenopodium ficifolium are the most dominant. Shrub type is common at the downstream sites of Jichon stream and along mainstream of North Han River down Lake Paro. A shrub species, Salix koreensis, is the most common. Tall grass type is dominant occupying the most vegetation zone of the tributary channels. Phragmites japonica is absolutely dominant. Due to its dense cover, a few plant species are co-existed. Otter activity was found in all three vegetation types and no marked activity was found at some sites of tall grass type. There is no difference in species composition and physiognomy between tall grass sites with and without otter activity, while it shows significant difference in fish availability between two groups. Overall we found that home range of otters in the region is along the mainstream and downstream of tributary streams with high fish availability in all vegetation types and in various human activity levels.

칼슘 통로 봉쇄제가 Pilocarpine에 의한 경련 및 기억장애에 미치는 영향

한형수,배현혜,박정숙,김중영 慶北大學校 醫科大學 1996 慶北醫大誌 Vol.37 No.3

목적 : 칼슘 통로 봉쇄제인 nifedipine과 flunarizine이 pilocarpine으로 유발된 경련의 발생과 뇌 조직 손상으로 인한 기억력 저하에 어떤 영향을 미치는지 연구하고자 하였다. 대상 및 방법 : ICR계의 생쥐 수컷을 사용하여 pilocarpone 투여후 6단계로 나누어 경련발작을 관찰하였으며, nifedipine과 flunarizine 전처치후 pilocarpine 투여에 따른 항경련작용을 측정하였다. Working memory를 통하여 기억력검사를 실시하였다. 결과 : nifedipine과 flunarigine 두 약물은 모두 경련 강도를 감소시켰고 flunarizine은 경련 시작 시간도 지연시켜 항경련 작용이 있음을 보였다. 칼슘 통로 봉쇄제는 주로 3일에서 10일 사이에 투여한 경우에 pilocarpine에 의해 기억력이 저하되는 것을 억제하는 것으로 나타났다. 결론 : 이상의 실험 결과에서 칼슘 통로 봉쇄제는 pilocarpine에 의한 경련 억제 작용과 기억력 저하를 억제할 수 있는 작용을 가지고 있음을 확인하였다. The effect of calcium channel blockers, nifedipine and flunarizine, on the pilocarpine-induced seizure and neuronal damage-induced memory deficit in mice was studied. After pretreatment of nifedipine or flunarizine, pilocarpine was administered intraperitoneally. Both drugs attenuated behavioral seizure activity and delayed onset of seizure activity. Memory was tested with working memory version of Morris water mazein 20 days following pilocarpine treatment and showed memory deficit. This deficit in memory was prevented when nifedipine or flunarizine were given during 3 to 6 day or 7 to 10 days after pilocarpine treatment. These results show that calcium channel blockers have anticonvulsant property and depress on pilocarpine-induced memory deficit.

한국사회 도시노인의 삶의 질에 관한 연구

한형수 한국사회복지정책학회 2004 사회복지정책 Vol.19 No.-

한국사회 도시노인들의 삶의 질을 종합적으로 분석하기 위한 본 연구는 도시노인의 삶을 건강과 주거, 가족관계 및 사회관계, 여가활동의 제 영역들에 대한 객관적 지표와 욕구, 영역별 만족도 차원에서 각각 파악하고 관계성을 종합적으로 분석하였다. 도시노인의 삶의 객관적 지표는 성별과 연령, 교육수준, 직업과 같은 인구사회학적 변인들에 따라 큰 차이를 나타내고 있으며, 노인의 삶의 욕구는 건강욕구, 가족 및 사회관계 욕구, 소득욕구, 여가활동 욕구 순이며, 노인의 삶의 제 영역별 만족도는 인구사회학적 변인들과 객관적지표 욕구에 의해 유의미한 영양을 받고 있으며, 삶의 종합적 만족도는 인구 사회학적 변인들을 비롯하여 건강과 소득, 주거, 가족 및 사회관계, 여가활동의 객관적 지표와 욕구, 주관적 만족도와 유의미한 정(+)의 상관관계를 전반적으로 가지고 있음이 확인되었다. 그리고 본 연구는 도시노인의 삶의 질의 분석틀과 개념화, 측정방법은 향후의 노인분야 연구를 포함하여 삶의 질 연구애 방법론적으로 기여할 것으로 기대된다. 또한 본 연구의 결과는 향후 우리나라의 노인복지정책의 기초 자료로서 충분한 가치른 가질 것으로 판단된다. The aim of this study is to estimate and explain the urban elderly's quality of life in Korean society through analyzing comprehensively their health condition, housing, family relation and social relation in terms of the objective indicator, their desire and degree of satisfaction to all kinds of their activities in leasure hours. From empirical data analysis this study found as follows. The objective indicator in the urban elderly's life quality shows wide divergence according to social factors such as the distinction of sex, age, education level and occupation. The priority of their life desire is ordered in health, family and social relation, income and activities in leasure hours, and the degree of satisfaction to their life area come under the meaningful being influenced on the social factors and the objective indicator, the degree of satisfaction to their life, the total satisfaction to their life has significantly constant correlations to the social factors and the objective indicator as well as health, income, housing, family and social relation, the objective indicator and desire of their activities in leasure hours, and the degree of their subjective satisfaction. I expect that this study could make a contribution to formation and conceptualization of analysis frame to elderlies' life quality, And further the result of this study will have sufficient values in furnishing basic data for elderlies' welfare policies.

슬러지 전처리와 고농도 MBR을 이용한 슬러지 감량화 공정연구

한규철,염익태,정우진,김형수 대한상하수도학회 2003 상하수도학회지 Vol.17 No.4

From this research, the performances of a sludge reduction in the sewage sludge aerobic digestion was experimented by using a sludge pretreatment and membrane bioreactor. The submerged plate membrane was used as the solid-liquid separation membrane . After drawing small amounts of sludge in a bioreactor and then doing the alkaline treatment and ozone treatment, the sludge was sent to back to the reactor. The HRT in the reactor was set as 5 days and the operation in the reactor was carried out at the DO of 1㎎/L on average. After 100 days of operation in the reactor, it was shown that the reduction efficiency of total solids was more than 83%. Most of volatile solids were removed through mineralization, and the considerable portion of the nonvolatile solids was dissolved and then flowed out with the effluent. Only about 16.3% of total solids in the sludge was accmulated in the reactor even without the loss of volatile fraction. Also, by deriving nitrification and denitrification in one reactor simultaneously, more than 90% of nitrogen removal effect was realized and the experiment was run smoothly without fouling of membrane, even in the high concentration of MLSS. Based on this experiment. sludge can be reduced considerably at a low HRT by these two newly suggested approach.

直射日光의 水面反射遮蔽를 위한 窓計劃에 관한 硏究 : 大邱 地方을 中心으로

韓允昊,金相徹,尹亨洙 嶺南大學校 環境問題硏究所 1990 環境硏究 Vol.9 No.2

窓의 前面에 넓은 수면이 전개되어 있는 경우에 直射日光 뿐만이 아니라 水面에 의한 反射光이 동시에 室內로 사입되어 실내의 熱環境을 열악하게 만들며 수면으로 인한 Glare 현상으로 眺望機能이 극히 악화된다. 따라서 本 稿에서는 建築的 手法을 통한 효율적 조절방법으로서, 遮陽과 발코니를 이용하여 眺望의 기능을 최대한으로 확보하면서 室內過熱의 원인이 되는 直射日光 및 反射光의 遮蔽 방법을 연구하였다. 그 결과를 요약하면 다음과 같다. 1. 水面 反射光은 넓은 발코니를 이용하여 日照環境이 나빠지기 쉬운 向에서도 眺望機能의 큰 손상없이 효율적으로 차폐가 가능하다. 2. 連續窓 계획시 遮陽計劃은 각 陰影角에 변화를 주어 格子遮陽裝置로 개량할 수 있다. 3. 日射遮蔽를 목적으로 계획된 遮陽裝置가 그 차양장치의 陰影마스크 만큼의 기간동안에는 窓을 통한 Glare 현상을 防止할 수 있다. In a case that there is broad water surface in front of windows, not only direct sun beams but also reflected sunbeams get into interior spaces. So indoor thermal environment is ready to spoiled and view from interior spaces through windows could also be impaired because of glare caused by reflected sun beams from water surface. In this paper, as an effective passive control, a method to provide a large solid angle for view through windows and to prevent direct and reflected sun beams with shading devices and balconies is studied. Results are as follows. 1. Planning broad balconies, reflected sun beams from water surface could be prevented effectively without damaging the view through windows. 2. In cases of planning shading devices for horizontally linear windows, eggcrate shading devices could be made by altering shading mask of horizontal and, or vertical shading devices. 3. Although shading devices are designed for covering direct and reflected sun beams from water surface, they could also prevent the glace from sky and water surface during the period of shading masks of shading devices.

韓國社會의 都市化過程에 대한 比較論的 分析

韓亨洙 서울市立大學校 1991 論文集 Vol.25 No.-

In the past two or three decades, Korean society has undergone rapid and continuous social changes arising from, what so called, the modernization. In terms of social structure industrialization and urbanization among other factors have brought about an enormous increase in the population of the primate city, Seoul, to well over 10.000,000 or 25 percent of the nation's population. Such a rapid urbanization has converted Seoul from a metropolis to megalopolis. We can say that the rapid industrial urbanization of korea like this has accelerated such over-urbanization and urban primacy as be found in the third world. In sociological perspective, the megalopolis, Seoul has made many cities formed and strata system among them occurred. And these make the urban social structure changed, the social life, that is, urban culture expanded, and further pathological problems and dark moral ambiguity exposed. It cannot be overlooked, however, that urbanism has bright aspects of urban culture such as generosity and openess in human relations and free atmosphere in society. Accordingly, the essential in development of Korean society is to promote sane characteristics of our urban social structure. What we must do at once is to set up a long-term master plan to the social development of our city, with basing on the scientific and detailed data.

장벽경색이 선행한 Henoch-Schonlein 자반증 1례

한헌석,하태선,송형근,이상전,안묘순,박범수 충북대학교 의과대학 충북대학교 의학연구소 1993 忠北醫大學術誌 Vol.3 No.1

Henoch-Schonlein 자반증은 피부, 위장관, 관절, 신장 등을 주로 침범하며 소혈관염을 기본 병리 소견으로하는 전신성 혈관 장애 질환이다. 위장관계 증상으로는 복통, 오심 및 구토, 잠혈, 토혈, 흑색변 등이 있을 수 있고, 이러한 증상은 합병증 없이 회복되는 것이 보통이나 드물게는 장중첩증, 장벽경색 및 괴사, 장천공 등의 심한 합병증을 동반할 수도 있다. 이러한 위장관계 증상들은 특징적인 피부 소견에 선행하여 나타날 수도 있으며, 이때는 급성복증에 대한 감별진단이 중요하다. 저자들은 장벽경색이 선행하여 감별진단에 어려움을 겪고 시험적개복술을 시행한 이후에 특징적인 피부 자반이 발현되어 Henoch-Schonlein 자반증으로 진단할 수 있었던 증례를 경험하였기에 이를 보고하고자 한다. 본 증례는 입원 1일전부터 시작된 복통을 주소로 입원한 5세 남아가 배꼽 주위에 심한 경련성 복통을 지속적으로 호소하였고 이학적 소견상 배꼽주위의 압통, 장음의 감소, 흑색변 등이 있었으며 소장조영술상 공장 부위에 미만성의 불규칙한 점막비후 소견을 보여 제 8병일에 시험적개복술을 시행한 결과 근위 공장에 국한된 장괴사의 소견이 발견되어 절제 및 문합술을 실시 하였다. 병리학적 검사에서는 장벽경색의 소견을 보였다. 수술후에 복통은 완화되었으나 경미하게 지속되었고, 제 13병일경에 급성 부고환염이 병발되었다가 회복되었고 제 15병일경에는 하지에서부터 발현된 자반이 3일간 지속되었다. 결구 Henoch-Schonlein 자반증과 이의 합병증으로 발생한 근위 공장의 장벽경색으로 진단하였다. Colicky abdominal pain as symptom of Henoch-Schonlein purpura occurs in up to 70% of patients, and results from submucosal edema and hemorrhage. Abdominal pain and other GI symptoms such as nausea, vomiting, melena and hematemesis resolve mostly without any complications. But rarely life-threatening GI complications such as intussusception, intestinal mural infarction and necrosis, and massive hemorrhage may develope. In 14% of patients, abdominal pain may precede other symptoms, and creats diagnostic difficulties. We reports a case of the Henoch-Schonlein purpura presented with colicky abdominal pain which resulted from intestinal mural infarction and preceded characteristic purpuric skin lesion by several weeks. This 5 year old male patient complained of colicky abdominal pain, nausea and melena. Exploratory laparatomy was done and revealed intestinal mural infarction in proximal jejunum. One week later operation, purpuric skin lesion develiped in both leg and feet, and then, Henoch-Schonlein purpura was diagnosed.

변압기 보호를 위한 월쉬 필터의 설계

안두수,김민형,이한석 成均館大學校 科學技術硏究所 1993 論文集 Vol.44 No.2

This paper deals with digital filter designed via Walsh function. The proposed method proves the relation between Walsh and Fourier coefficients from the sinusoidal characteristics of Walsh function. Then using the above method, we could find the fundamental wave and desired harmonics simply and quickly.

안정도를 고려한 다변수계의 모델축소

안두수,김민형,이한석,김종부 成均館大學校 科學技術硏究所 1993 論文集 Vol.44 No.2

This paper presents model reduction method of multivariable systems using orthogonal transformation based on dominant pole retention method in time domain. The reduced model which is designed by presented method preserves stability if the original system is stable and computational advantages are obtained through the use of orthogonal functions.