알루미늄 튜브 하이드로포밍에서의 예비 굽힘 공정의 효과에 관한 연구

임희택,박경창,김형종,김헌영 江原大學校 産業技術硏究所 2004 産業技術硏究 Vol.24 No.B

Recently social demands of fuel economy and environmental regulations require the development of lightweight components and new manufacturing technologies. The aluminum tube hydroforming is a manufacturing process which can provide lightweight components as automotive parts. In this paper, the hydroformability of aluminium tube in different condition of bending process is presented. An investigation has been conducted on how to control the deformed shape and its effect on thinning distribution after hydroforming by using finite element simulation. Finite element simulation of tube hydroforming for automotive trailing arm is carried out to explore the effect of 2-dimensional and 3-dimensional bending.

용융슬래그로부터 합성된 제올라이트 이용한 해수 중의 N, P 제거

임준혁,정진영,이성우,홍성호,김경희,이제근 한국공업화학회 2003 응용화학 Vol.7 No.1

This study examined, as the one way of using zeolite, the about the removal of ammonia nitrogen and phosphorus that cause the eutrophication occurred the adjoining seas.4A type zeolite was used as an adsorbent to remve NH_4-N, PO_4^3-P ion in the artificial seawater. Zeolite is more required than in the fiesh water, under the same conditions, in order to remove NH_4-N in the sea water. The lower the thickness of NH_4-N is in the early stage, the more Freundlich type equation the value of 1./n increases. In case of PO_4^3-P indicated that the removal efficiency was relatively independent of PO_4^3-P concentration. Freundlich parameter 1/n has the value nuder 2. So it shows that absorption is made with relatively ease.

방사성폐기물에 대한 중·고등학생들의 인식 조사

임경희 이화여자대학교 교육대학원 2005 이화교육논총 Vol.15 No.-

This study is intended to find what direction environmental education should follow for middle and high school students by analyzing students' perception about radioactive wastes with environmental education or without it. Also, it examines how students perceive radioactive wastes issue, how much concern and interest they have, and what students think they know about the issue, under the situation that students have been given environmental education independently in middle and high schools. For the study, a questionnaire was developed and given to 479 students of middle and high schools located in Seoul, Kyonggido and Incheon. The students' answers were analyzed with the SPSS WIN10.0 program to find frequency, percentage, and t-test values. The results are summarized as follows; First, we found that the middle and high school students have heard about radioactive wastes, but they have a great lack of experience in learning it. They have studied the content of radioactive wastes in social science classes and science classes more frequently than environment classes. Also, they usually get knowledge about radioactive wastes not from school but the mass media. Second, the high school students with environmental education tend to think they have more knowledge of radioactive wastes, and show higher concern and interest than the students who did not have environmental education. Also, they want to gather more information about it and show higher effectiveness of field study than others. Moreover, regarding a student's knowledge on radioactive wastes, it is found that high school students have more knowledge than middle school students, irrespective of environmental education experiences. It shows that students get more fragmentary knowledge from the surroundings, not practical knowledge from environmental education they had, as they get older. On the other hand, middle school students show higher effectiveness of study than high school students. Third, while high school students with environmental education agree that it is necessary to construct nuclear power plants, the study shows there are no differences in their perception about the need of building a radioactive wastes disposal site, regardless of their environmental education experiences and their grades. Also, regarding the support of residents' demonstration, high school students who did not have environmental education are more likely to agree to it. Thus, we have to find the alternative policies for the increased effectiveness of radioactive wastes education, while trying to establish a new model of radioactive wastes education and develop a program. Based on the result, for the effective radioactive wastes education, we suggest that it needs more specific, step-by-step education on radioactive wastes, it needs to develop various teaching and teaming approaches and teaming materials, and it needs to increase a student's field study connected to related organizations.

7β-Hydroxycholesterol이 사람 백혈암에 대한 세포 독성 효과

임희경,현진원 제주대학교 생명과학기술혁신센터 2002 제주생명과학연구 Vol.5 No.-

The cytotoxic activity of 7β-hydroxycholesterol (7β-OHC) has been evaluated using various leukemia cell lines by MTT test. Among the tested cell lines, 7β-OHC showed to be more cytotoxic to THP-1, human monocytic leukemia cell line. IC50 value of 7β-OHC on THP-1 was 10μM. Kinetic of on THP-1 showed that growth of THP-1 began to decrease at 36 h after treatment 7β-OHC. 7β-OHC induced apoptosis shown by DNA fragmentation by gel electrophoresis. 7β-OHC induced apoptosis through down-regulation of Bcl-2 expression. Taken together, these results suggested that treatment with 7β-OHC inhibits the proliferation of THP-1 cells through apoptosis.

에탄올에 의한 Epidermal Growth Factor 수용체 결합의 변화

임희경,여의주 제주대학교 생명과학연구소 2000 제주생명과학연구 Vol.3 No.-

Ethanol interferes with the proliferation of several cell lines in vitro and in vivo. The anti-proliferative effects of ethanol have been suggested to contribute to the pathogeneses and progression of alcoholic diseases. To define the cellular and molecular mechanisms in the anti-proliferative actions of ethanol, the growth factor- induced signaling processes have been studied in various cells. Ethanol effect is different depending on whether its action is acute or chronic, the type of growth factors, and the concentration of both ethanol itself and the growth factor(s). Previously, we have reported that the growth of Swiss 3T3 cells was inhibited by ethanol in a concentration-dependent manner. A disruption of cellular proliferation might be due to an inhibitory effect of ethanol on growth factor- mediated cellular signaling systems for the mitogenic function. An ㅑnitial step of epidermal growth factor (EGF)-signaling events, tyrosine autophosphorylation of the growth factor receptors, was especially prevented by ethanol in the cell line. Since the receptor autophosphorylation is triggered by initial binding of EGF and its receptor, we further investigated the ethanol effect on [125I] EGF- binding to ㅑts receptor. Scatchard plot analysis demonstrated that [125I] EGF-binding to high-affinity states of the EGF receptor was decreased by 60%. This finding could explain the modified responses to this growth factor in Swiss 3T3 cells treated with sub- lethal concentrations of ethanol.

진단 기준에 따른 취학전 어린이의 중증 유아기 우식증 유병률 비교

임경욱,이광희,라지영,이동진,안소연,김지영,송지현,김윤희 大韓小兒齒科學會 2008 大韓小兒齒科學會誌 Vol.35 No.4

연구목적은 중증 유아기 우식증에 대한 두 개의 정의를 진단 기준으로 하였을 때 각 기준에 따른 유병률이 일치하는 정도를알기 위함이었다. 연구대상은 익산시 어린이집 중에서 무작위로 추출한 7개 어린이집의 36개월 이상 71개월 이하 어린이401명 이었다. 치경과 탐침을 사용한 구강검사를 통하여 치아별 우식경험유치면 (dmfs)의 수를 조사하였으며 . 중증 유아기 우식증의 진단 기준은 (1) 상악 전치에 1개 이상의, 와동이 형성된 우식,상실(우식증에 의한), 충전 평활면이 있거나 (2) 우식,상실,충전 치면의 수가 3세는 4개 이상.4세는 5개 이상.5세는 6개 이상인 경우로 하였다. 상악 전치부 우식증에 의한 우식유병률과 우식경험유치면수(dmfs)에 의한 우식유병률은 3세에서 각각 26.7%. 28.9%, 4세에서 각각 32.4%, 30.4%, 5세에서 각각 39.4%, 41.3%, 전체에서 각각 35.4%, 35.9%으로서. 연령별로는 약간의 차이가 있었으나 전체에서는 차이가0.5%로서 거의 일치하였다. 따라서 중증 유아기 우식증의 진단은 두 가지 기준 중에서 어느 하나를 사용하더라도 비슷한 결과가 나을 것이라는 것을 확인할 수 있었다. The purpose of study was to compare the prevalences of severe early childhood cahes(S-ECC) using two different diagnostic criteria. The subjects of this study included 401 preschool children from 36 to 71 months of the randomly selected seven nurseries in Iksan city. Severe early childhood caries was defined as (1) 1 or more cavitated, missing (due to caries), or filled smooth surfaces in primary maxillary anterior teeth or (2) a decayed, missing, or filled score of ≥4 (age 3), ≥5 (age 4), or ≥6 (age 5) surfaces. The prevalence determined by maxillary anterior caries and the prevalence determined by dmfs were 26.7%, 28.9% in 3 years, 32.4%, 30.4% in 4years. 39.4%, 41.3% in 5 years, and 35.4%, 35.9% in all, respectively. The results suggest that the two diag-nostic criteria of the severe early childhood caries yield almost the same results.

효과적인 유역관리를 위한 CN기법 기반의 침투량 산정 및 기저유출량 분석

김희원 ( Hee Won Kim ),신연주 ( Yeon Ju Sin ),최정헌 ( Jung Heon Choi ),강현우 ( Hyun Woo Kang ),류지철 ( Ji Chul Ryu ),임경재 ( Kyoung Jae Lim ) 한국물환경학회 2011 한국물환경학회지 Vol.27 No.4

Increased Non-permeable areas which have resulted from civilization reduce the volume of groundwater infiltration that is one of the important factors causing water shortage during a dry season. Thus, seeking the efficient method to analyze the volume of groundwater in accurate should be needed to solve water shortage problems. In this study, two different watersheds were selected and precipitation, soil group, and land use were surveyed in a particular year in order to figure out the accuracy of estimated infiltration recharge ratio compared to Web-based Hydrograph Analysis Tool (WHAT), The volume of groundwater was estimated considering Antecedent soil Moisture Condition (AMC) and Curve Number (CN) using Long Term Hydrologic Impact Assessment (L-TH1A) model. The results of this study showed that in the case of Kyoung-an watershed, the volume of both infiltration and baseflow seperated from WHAT was 46.99% in 2006 and 33.68% in 2007 each and in Do-am watershed the volume of both infiltration and baseflow was 33.48% in 2004 and 23.65% in 2005 respectively. L-TFIIA requires only simple data (i.e., land uses, soils, and precipitation) to simulate the accurate volume of groundwater. Therefore, with convenient way of L-TKIA, researchers can manage watershed more effectively than doing it with other models. L-THIA has limitations that it neglects the contributions of snowfall to precipitation. So, to estimate more accurate assessment of the long term hydrological impacts including groundwater with L-THIA, further researches about snowfall data in winter should be considered.

토양으로부터 Polygalacturonase를 생산하는 Cryptococcus spp. CS-2의 분리 및 동정

강희경,임채영,양영기 조선대학교 생명과학연구소 1998 생명과학 연구 Vol.6 No.-

제주도 북제주군 애월읍에 위치한 밀감 과수원의 토양으로부터 YM 배지를 이용하여 효모를 분리한 후, 1% polygalacturonic ac펀가 첨가된 배지에서 polygalacturonase 생성능력이 우수한 효모를 분리하였다. 분리된 strain CS-2의 생리화학적인 실험을 수행한 결과 분리균주는 Diazonium blue B(DBB) color test와 urease test에서 양성반응을, acetic acid, citrate acid 생성시험, gelatin과 fat 분해시험에서는 음성반응을 나타내어 Cryptococcus속과 비슷한 양상을 보였다. 탄소원의 조사에서 galactose를 탄소원으로 이용할 수 없었고, 질소원은 모두 이용할 수 없었다 또한 30℃에서는 성장하였으나, 35℃ 이상의 온도, 50% 이상의 glucose농도(w/w), 0.01% cyclohexamide 그리고 1% acetic acid에서는 성장을 하지 못하였다. 현미경을 이용한 형태학적인 관찰 결과, strain CS-2의 크기는 1.3×2.9μm인 타원형으로 관찰되었다. multiple budding을 하고, ascospore는 존재하는 반면, pseudornyceliurn과 true mycelium은 존재하지 않았다. 본 실험에서 사용된 strain CS-2의 형태학적, 배양학적, 생리학적인 여러 가지 결과를 종합하여 Cryptococcus속의 특징과 유사함을 확인할 수 있었기에 Cryptococcus spp. CS-2라 명명 하였다. A ploygalacturonase-producing yeast was isolated from Cheju soil by selective enrichment medium. One strain which has the highest activity of polygalacturonase was selected. The characteristics of the strain CS-2 were as follows: CS-2 utilized xylose, sucrose, maltose, trehalose, cellobiose, melibiose, lactose raffinose, inositol dulicitol, and dextrose, but did not utilize galactose, nitrate, nitrite, and lysine. Growth of CS-2 was inhibited by cyclohexamide, 1% acetic acid, and high concentration(over 50%) of glucose. It grew at 30℃ but did not at 35℃, The cell size of the strain CS-2 was 2.9㎛ in length and 1.3㎛ in diameter. Vegetable reproduction was multiple budding and ascospores was present 1 to 4. Pseudomycelia or true mycelia formation were not observed in any of the cultures. These results suggest that strain CS-2 is most likely a strain related Cryptococcus spp.(Cryptococcus spp. CS-2).

배내측 시상핵 손상이 학습에 미치는 영향

장현갑,임호찬,장경희 한국심리학회 1989 한국심리학회지 생물 및 생리 Vol.1 No.1

본 연구는 흰쥐에 있어서 배내측 시상핵의 손상이 인지적 학습과제인 미로학습과 정서적 학습과제인 조건회피 학습의 수행에 어떤 영향을 미치는 가를 검토하였다. 본 연구의 결과를 요약하면 다음과 같다. 첫째, Hebb-Williams미로학습과제에서 배내측 시상핵 손상군은 통제군에 비해 유의미하게 많은 오류수를 보여주었고, 둘째, 일방 조건회피학습에서도 손상군은 통제군에 비해 학습수행력이 유의미하게 감소하였다. 세째, 미로학습에서 손상동물은 학습 제1일째에 비해 제2일째에 오류수가 유의미하게 감소하였지만 조건회피학습에서는 제1일째와 제2일째 사이에 별다른 변화가 없었다. 이러한 결과는 배내측 시상핵이 이 인지적 학습과제의 수행에 영향을 미칠 뿐만 아니라 정서성이 요구되는 학습과제의 수행에도 영향을 미친다는 사실을 시사한다. The purpose of this study was to investigate the effects of dorsomedial thalamic nuclei lesions on cognitive learning task(eq. maze learning) and emotional learning task(eq. conditional avoidance learning) in the rat. The results of this study were as follows. First, experimental group showed significantly more errors than control group in the Hebb-Williams maze task, Second, experimental group showed significantly lower learning ability than control group in the one-way conditional avoidance learning. Third, in the maze learning, experimental group showed reduced errors in the second day learning compared to the first day learning score. But, in the conditional avoidance learning, does not showed any difference between two days learning score. These results suggested that dorsomedial thalamic nuclei might be related to emotional learning task, as well as cognitive learning task.

평양 남정리 53호분 출토 토제칠기의 보존 및 제작기법 연구 : 토제칠이배, 토제칠반, 토제칠안

황현성,임수경,김희진,이태진,고민정,윤은영 국립중앙박물관 2013 고고학지 Vol.19 No.-

본고는 일제 강점기 조사 미등록 유물 정리사업의 일환으로 수행한 평양 남정리 53호분 출토 토제칠이배, 토제칠반, 토제칠안에 관한 연구이다. 남정리 출토 유물은 소지가 목심이 아닌 토제라는 것과 칠이배와 칠반을 얹은 칠안이 함께 출토되었다는 점에서 주목할 만하다. 토제칠이배 및 칠반 그리고 칠안의 보존처리를 통해 이들의 형태와 문양 등에 대해 알 수 있었다. 또한 칠기에 사용된 붉은색 안료의 성분을 분석하여 안료의 주성분이 진사(HgS)였음을 확인하였다. 이번 연구에서 기존에 잘 알려지지 않았던 한반도 내 위치한 낙랑의 토제칠기에 관해 살펴볼 수 있었으며 이러한 제작방법이 한나라 고유의 문화인지 아니면 재지세력이 한나라의 영향을 받아 현지화한 문화의 산물인지에 대해 생각해 볼 수 있는 기회라 생각된다. This research paper examines the lacquered pottery cup, plate and table unearthed from Tomb No. 53 at Namjeong-ri in Pyongyang, which were under conservation treatment as a part of the Project of Unregistered Artefacts Uncovered in the Japanese Colonial Era. It is very rare to have a lacquered pottery cup and plate, lying on a lacquered pottery table, as a set of grave goods. In particular, they are not wooden but pottery items. Through conservation treatment for lacquered pottery cup, plate and table, it was possible to find out their shapes and decoration patterns. The resulting analysis of the red pigment used indicates that cinnabar (HgS) is the main element. This research is significant because it examines lacquered pottery wares produced in Lelang, which has rarely been conducted. Further research will need to prove whether their production techniques were in the unique Chinese Han style or were produced by indigenous craftsmen who adopted the Chinese Han technique.