졸-겔법을 이용한$(Ba_{1-x}Sr_x)TiO_3$분말합성

김영석,김덕준,김환,Kim, Young-Seok,Kim, Duk-Jun,Kim, Hwan 한국재료학회 1992 한국재료학회지 Vol.2 No.2

본 연구에서는 $Ba(OH)_2{\cdot}8H_2O,\;Sr(OH)_2{\cdot}8H_2O$ 및 $Ti(i-OC_3H_7)_4$를 사용하여 졸-겔법에 의해 미세한 $(Ba_{1-x}Sr_{x})TiO_3$ 분말을 제조하였다. TEM 관찰, BET 비표면적측정 및 XRD회절도의 분석결과 $700^{\cric}C$에서 하소한 뚠말의 입자크기는 20~40nm이고 입방정상으로 존재하였다. 또한 XRD 회절도고부터 계산된 격자상수 및 (112)피크의 이동으로부터 고용체분말이 형성되었음을 확인할 수 있었다. 제조된 분말에서의 EDAX 분석을 통한 양이온들의 상대적인 비율 및 소결체에 대한 유전상수의 측정결과로부터 제조된 분말에서 양이온들의 분포가 입자단위에서 균질함을 예상할 수 있었다. Using $Ba(OH)_2{\cdot}8H_2O, \;Sr(OH)_2{\cdot}8H_2O$ and $Ti(i-OC_3H_7)_4$, fine $(Ba_{1-x}, \;Sr_{x})TiO_3$ powders were synthesized through sol-gel process. The particle size of the powders calcined at $700^{\cric}C$ proved to be 20-40nm by the observation of TEM micrographs and measurement of BET specific surface area. The analysis of XRD patterns showed that the phase of the powders was cubic, and it was identified with the lattice parameters determined through XRD patterns and the shift of (112) peaks that the solid solution powders were synthesized. It was expected through the analysis of relative ratio of cations and the uniformity of compositions in the powders examined by EDAX analysis and relative dielectric constant measurements for sintered body that the distribution of cations was uniform in particle unit.

탄소섬유를 이용한 600V 이하 저압 케이블의 전자파 차폐특성

김영석,김택희,김종민,송길목,김지연,김원석,곽동순,Kim, Young-Seok,Kim, Taek-Hee,Kim, Chong-Min,Shong, Kil-Mok,Kim, Ji-Yeon,Kim, Won-Seok,Kwag, Dong-Soon 대한전기학회 2017 전기학회논문지 Vol.66 No.1

This study used general carbon fibers(CF), which can be utilized for a low voltage cable screen, as well as metal-coated carbon fibers(MCF) to make cables and analyzed the properties of electromagnetic effectiveness. Both braid CF and MCF cables with 3,000 strands, 16 spindles, and braid density of 90% or over were adopted. The tape-type MCF specimens were spread into a tape(width: 15mm) using a hot melt to make a cable. The shield effectiveness was measured up to the 1GHz range in accordance with IEC 62153-4-6; braid shielded cables featured a superior shielding effect at 63dB than tape-type shielded cables. That was because the tape-type shielded cable has relatively more gaps and holes between carbon fibers than the braid type, resulting in a more inflow or emission of electromagnetic waves. In the case of braid cables, the characteristics of their electromagnetic waves were enhanced, with higher spindles and higher conductivity of carbon fibers. The shield effectiveness of the MCF shielded cable, however, was lower than that of tin-coated one.

단삼이 당뇨병성 신병증 Rat의 신기능 및 조직학적 변화에 미치는 영향

김영석,이병철,안세영,두호경,안영민,Kim, Young-Seok,Lee, Byung-Cheol,Ahn, Se-Young,Doo, Ho-Kyung,Ahn, Young-Min 대한한방내과학회 2008 大韓韓方內科學會誌 Vol.29 No.3

Objective : Diabetic nephropathy is the most common cause of end stage renal disease. AGE, $TGF-{\beta}1$ type IV collagen, and macrophage/monocyte infiltration are the main factors of diabetic nephropathy. We investigated the effects of Salvia miltiorrhiza on renal function and histopathological changes in streptozotocin(STZ)-induced diabetic nephropathy rat model. Methods : Diabetes was induced in male Sprague-Dawley rats(290${\pm}$10g) by injecting STZ(45mg/kg) into the tail vein. Rats were divided into 3 groups(n = 6): normal, control, and salvia. After 8 weeks of administration of Salvia miltiorrhiza extract on the Salvia group, we checked 24 hrs urine, blood biochemistry and renal tissue to evaluate renal function and histopathological changes by examining parameters including albuminuria, BUN, creatinine, cholesterol, LDL, TG, macrophage/monocyte antigen(ED-1), $TGF-{\beta}1$, AGE, and type IV collagen. Results : Salvia miltiorrhiza decreased the amount of 24hrs proteinuria, and inhibited histopathological changes of diabetic nephropathy including the expression and accumulation of various factors which could promote development of diabetic nephropathy. Conclusion : These findings suggest that Salvia miltiorrhiza might protect the renal function and inhibit the development of renal injury by regulating factors including AGE, $TGF-{\beta}1$ Type IV collagen, macrophage and monocyte infiltration. So Salvia miltiorrhiza can be used for diabetic patients to prevent the progression of diabetic nephropathy.

6-propyl, 2-thiouracil로 유발된 갑상선 기능저하증 동물모델에서 파극천이 갑상선 호르몬 및 갑상선 조직에 미치는 효능

김영석,안세영,안영민,이병철,Kim, Young-Seok,Ahn, Se-Young,Ahn, Young-Min,Lee, Byung-Choel 대한한방내과학회 2011 大韓韓方內科學會誌 Vol.32 No.3

Objectives : Hypothyroidism is the most common pathological disease of the endocrine system. Morinda Officinalis Radix has been used in treatment of Yang deficiency. In this study, we investigated the therapeutic effects of Morinda Officinalis Radix on a rat model of hypothyroidism induced by 6-propyl, 2-thiouracil (PTU). Methods : Two-month-old Sprague-Dawley male rats were used with injection of PTU which induced rats into hypo-thyroidism. During 2 weeks, rats were treated with Morinda Officinalis Radix and thyroxine. Body weights were checked every week, the after 4 weeks, biochemical analyses were performed. The levels of T3, T4 and TSH was measured by EILSA. Results : In the Morinda Officinalis Radix group, we could observe the level of T4 significantly increased and TSH level significantly decreased. Conclusions : Morinda Officinalis Radix could help the thyroid to produce thyroid hormones under PTU suppression. There is no harm effect on liver and kidney function, or other metabolism. According to these results it could help to treat hypothyroidism patients and relieve their symptoms.

라면 제품에서 패키지디자인의 색채표현에 관한 연구

김영석숴 ( Young Seok Kim ) 한국기초조형학회 2012 기초조형학연구 Vol.13 No.4

본 연구는 라면 제품에서 색채이미지가 구매결정에 주요한 동인(動因)이 될 것이라고 보고, 라면 제품에서 패키지디자인의 사례분석을 색채로 한정하여 구매 선호도가 높은 제품을 대상으로 색채의 특징을 고찰하였으며, 아울러 색채에 의한 구매경험과 구매결정시 색채의 중요성에 대하여 실증적 분석을 실시하였다. 그 결과는 다음과 같다. 첫째, 구매 선호도가 높은 제품의 색채 수는 3~4개로 단조로운 배색을 가지고 있었으며, 배색은 따뜻하고 부드러운 느낌을 주는 난색계열인 빨강과 주황이 주조를 이루고 있다. 그러나 시장점유율에서 변수가 큰 제품들은 라면의 주조색인 Soft?Warm의 영역에서 탈피하고 Soft?Cool의 영역에 자리 잡음으로써 판매실적과 연결시킬 수 있음을 시사하고 있다. 또한 변화된 배색 이미지의 미각 형용사는 ``얼큰한``, ``매콤한`` 데서 ``담백한’, ``개운한’ 이미지로 변화됨을 파악할 수 있었다. 둘째, 라면 제품에서 패키지디자인의 색채로 인한 구매경험은 남자가 여자보다 구매경험이 높게 나타났으며, 연령별 경우에는 20세 미만은 물론 20~40세까지 높게 나타났다. 그리고 직업별 경우에는 직장인, 학생, 주부는 구매경험이 우세하나 자영업자의 경우에는 그렇지 않은 것으로 나타났다. 셋째, 색채가 구매결정에 미치는 영향력은 남자가 여자보다 긍정적인 결과를 보였으며, 연령별 특징에서는 20세 미만과 20-40세의 경우에 긍정적인 결과가 우세하였다. 그리고 직업별 경우에는 직장인, 학생, 자영업자가 긍정적인 결과가 우세하였나, 주부인 경우에는 그렇지 않은 것으로 나타났다. This study dealt with case studies of Ramyeon package as color image may be a main motivation of purchase intention. Thus, this study examined colors of high priority products and took empirical analysis on the importance of color in the purchase experience and purchase determination by color. The results can be summarized into three as follows. First, those with high purchase priority have simple coloration with 3 or 4 colors with red and orange its main that sense soft and warm. But, those with major variable in market share looked deviated from major soft and warm and took soft and cool area as new territory to reinforce color marketing. It, in turn, may result in sales increase. Accordingly, the changed coloration also nuanced the change of taste adjectives from such as ``hot`` and ``spicy`` to ``plain`` ``clean`` And color must be used effectively in a limited surface of package and must be harmonized with logy type and illustration color. Second, as to purchase experience by package design in Ramyeon, male had higher purchase experience than female. As to age, both under 20s group and 20s~40s age group had higher purchase experience. As to job type, employed, students and housewives had higher experienced but self-employed did not. Third, as to the effect of color on the purchase determination, male had more positive than female, and under 20s and 20s~40s had more positive results. As to job types, employed, students and self-employed had higher positive result, but housewives did not. As to the effect of the color on the purchase determination, there was no statistically difference by sex, age and job type.

우리나라 공공도서관의 이용변화 추이 분석 및 대응방안 연구

김영석,Kim, Young-Seok 한국도서관정보학회 2021 한국도서관정보학회지 Vol.52 No.2

This study aims to analyze the trend of library use according to the expansion of public library infrastructure in Korea, and to search for new roles and services of libraries based on the results of the study. Using the statistical analysis, literature review and partially interview method, the number of borrowers and loans from 2009 to 2019 were analyzed. The result of the survey reveals that the number of public libraries increased by 61.3% during the survey period, while the number of borrowers decreased by 57.5%, and the number of book loans increased only by 18.2%. The result of the analysis claims that the causes of the decrease in the number of materials borrowers were an error in the process of inputting statistics and manipulating the number of book loans by the local library. The population of children and young adults decreased during the survey period, which led to a decrease in the number of children and young adult borrowers. The result of the study reveals that the increase in the use of public libraries in Korea, like other advanced countries, is stagnant. The following new roles and services are suggested for the development of public libraries: Libraries expand non-face-to-face services and electronic resources, and promote their use. Libraries expand cultural and lifelong learning programs further. 본 연구는 우리나라 공공도서관 인프라 확충에 따른 도서관 이용의 변화 추이를 분석하고, 그 결과에 따라 도서관의 새로운 역할과 서비스를 모색하는 데 그 목적이 있다. 통계분석과 문헌조사법 그리고 부분적인 인터뷰 방법을 사용하여 2009년부터 2019년까지의 공공도서관 대출자 수 및 대출 책 수를 조사·분석하였다. 조사 결과 도서관 수는 조사기간 동안 61.3% 증가한 반면, 대출자 수는 57.5% 감소하였고, 대출 책 수는 18,2% 증가에 그쳤다. 분석 결과 대출자 수감소 원인은 통계 입력 과정에서의 착오와 도서관에서 행해진 대출실적 부풀리기로 밝혀졌다. 조사기간 동안 어린이와 청소년 인구가 감소하였는데, 이것은 어린이와 청소년 대출자 수 감소로 이어졌다. 연구 결과 우리나라의 공공도서관 이용은 다른 선진국처럼 그 증가가 정체되고 있는 것으로 밝혀졌다. 공공도서관의 발전을 위해 다음과 같은 새로운 역할과 서비스를 제안한다: 도서관은 비대면 서비스 및 비실물자료를 확대·확충하고 그 이용을 활성화 시킨다. 문화 및 평생교육 프로그램을 더욱 확대한다.

영국 공공도서관의 어린이.청소년 독서 프로그램 운영 사례 연구 - Stories from the Web 분석을 중심으로 -

김영석,Kim, Young-Seok 한국비블리아학회 2007 한국비블리아학회지 Vol.18 No.1

This study aims to examine and analyse 'Stories from the Web(SFW)' in order to assist the development of reading programs for children and young adults in Korea. The British public libraries operate a reading program of 'Stories from the Web(SFW)' which is a web-based reading program for children 0 to 14 years old. SFW is not a reading program that enables children to read books on-line. but motivates children to read books in public libraries.

염수 및 분진에 의한 고분자 절연물의 표면누설전류 특성과 사고 위험성

김영석,송길목,정진수,정종욱,김선구,Kim, Young-Seok,Shong, Kil-Mok,Jung, Jin-Su,Jung, Jong-Wook,Kim, Sun-Gu 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.8

It is necessary to study on the prevention and the management of electrical facilities because the electrical fault took place at the dust occurrence area due to environmental pollution. In particular, the dust accumulates easily on insulation material which is exposed an external long time. Therefore, we measured surface leakage current and surface variation of insulation material due to the dust and salt-water. From the results, the surface of bakelite is bad effect for salt-water than other material. The surface leakage current increases by repeated salt-water pollution and the surface of material is carbonized with arc occurrence. Also, it is need to variation of surface coating and shape of material to repress a leakage current on electrical material. 환경오염이 심한 분진 발생지역에서는 전기 사고가 자주 발생하기 때문에 전기설비에 대한 유지관리와 예방에 대한 연구가 필요하다. 특히 외부에 전기절연물이 장기간 노출되면, 쉽게 분진이 축적되고 수분, 습기 등에 의한 누설전류의 발생으로 전기사고에 이르게 된다. 따라서 본 연구에서는 분진, 염수 등에 의한 전기설비 절연재료 표면변화와 표면 누설전류를 측정하였다. 측정결과로부터 베이클라이트의 표면이 다른 재료보다 염수에 대한 영향이 심하였다. 또한 베이클라이트 표면 누설전류는 반복되는 염수 오염에 의해 증가하고 재료표면은 미소아크가 발생하고 탄화되었다. 따라서 절연물에서의 누설전류를 억제하기 위해서는 재료의 형태 및 표면 코팅 등이 변화가 필요하다.

경기도 B신도시 건설과 공공도서관 건립에 관한 연구

김영석,Kim, Young-Seok 한국도서관정보학회 2010 한국도서관정보학회지 Vol.41 No.3

Establishing public libraries is more convenient in new towns than in older cities. This is because public libraries can be established during the construction of new towns. This study examined how public libraries were built in B new town, which is one of the first new towns constructed in the capital region of Korea. B new town has problems that not even one public library was operated before the people moved to the B new town and that establishing public libraries was not finished when the construction of the new town was completed. The number of public libraries is not enough in B new town. In conclusion, there are many problems in establishing public libraries in B new town. 철저한 계획도시인 신도시는 도시건설 과정에서 주민들에게 필수시설인 공공도서관을 건립할 수 있기 때문에 도서관 인프라를 확충할 때 기성도시보다 훨씬 수월하다고 할 수 있다. 본 연구는 우리나라 1기 수도권 신도시중의 하나인 B신도시를 선정하여 이 도시 건설과정에서 공공도서관 건립이 어떻게 이루어졌는지 조사 분석하였다. B신도시의 경우 주민 입주 시기 전 그리고 신도시 건설 완료 전에 공공도서관이 건립되지 못한 문제점을 가지고 있고, 현재까지 건립된 공공도서관의 수도 부족하다. 결론적으로 B신도시 건설 과정에서의 공공도서관 건립은 미흡한 점이 많다고 하겠다.

초등학교 어린이 독서 증진 방안 연구 - 어린이도서를 학교 읽기 수업에 활용하는 방안을 중심으로 -

김영석,Kim, Young-Seok 한국비블리아학회 2006 한국비블리아학회지 Vol.17 No.1

The main aim of this study is to discover ways of promoting elementary school children's reading. The study provides a feasibility analysis of utilizing children's books in reading lessons, which is proposed as one of the ways. The contents of the four reading textbooks for Year 1 and 2 in Korea were analyzed and it was examined what and how children learn in reading lessons. The contents and methods of reading lessons in the UK and the USA were also investigated. It is considered that utilizing children's books in reading lessons which is the proposed way for promoting children's reading corresponds well with the goal of the curriculum of Korean. There is a high feasibility of applying the way to elementary schools in Korea. This is because the way has more advantages than the present textbook based reading lessons and the way is well utilized in elementary schools in the UK.