• 한국식품위생안전성학회지
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• 제13권2호
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• pp.171-187
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• 1998

Garlic occupies a special position among the many foods of vegetable origin because it is the sole food for Koreans during the their lives. And vitamin A has been ingested by forms of food or additives. Cadmium has been described as one of the most dangerous trace elements in the food and environment of man and livestocks. Since the de novo synthesis of stress proteins can be detected early after exposure to some agents, analysis of cadmium-induced changes in gene expression , ie. alterations in patterns of protein synthesis, may be useful to develop as biomarkers of exposure and damage for food hygiene. He acute and chronic combine effects of cadmium (Cd, CdCl2 20mg/kg), garlic oil(Dds: diallyl disulfide 50mg/kg, 3 times a week) and vitamin A(Ra: retinol acetate 50,000 IU/kg, 3 times a week) on Wistar male rats were evaluated concerning cadmium contents, tissues enzyme activity, HSP expression histopathological and electron microscopical examinations. The results of the study are as follows ; 1. Less cadmium was absorbed through the digestive tracts, but the ratio of contents in tissue were not changed by the simultaneous adminstration of diallyl disufide or retinol acetate. 2. ALT(alanine aminotransferase) , AST(aspartate aminotransferase), glucose, BUN (blood urea nitrogen), creatinine, the key indices of the clinical changes in hepatic and renal function were significantly hanged by the cadmium treatment after 1 week in liver, after 4 weeks in kidney. 3. Histopathological changes in cadmium treated rats were appeared at 8 weeks age treatment in kidneys. Homogenous eosinophilic material was accumulated in cortical and collecting tubular lumens at 16 weeks. Degenerated or necrotized tubular cells were observed in cortex and medulla. Degenerated seminiferous tubules and homogeneous eosinophilic material was seen in interstitial tissue of rat treated with cadmium for 16 weeks. Calcium deposits were seen in degenerated seminiferous tubules and the tubules showed severe calcification of rat treated with cadmium for 16 weeks. Electron microscope changes in kidney were observed in rats treated with CdCl2 20 mg/kg. Proximal convoluted tubule cells showed selling of cytoplasm and narrow lumen. Capillary endothelial cells showed cytoplasmic vacuoles and swelling. Degenerated epithelial cells were accumulated in tubular lumen of kidney. 4. Enhanced synthesis of 70 KDa relateve molecular mass proteins were detected in 2 hours after cadmium, exposure, with maximum activity occurring at 8~48 hours. Induction of HSP 70 was evident at proximal tubules and glomeruli in kidney. Testicular cells produced enough HSP to be detected normally. From the above results, it could be concluded that HSP70 induction by the cadmium treatment was a rapid reaction to indicated the exposure of xenobiotics, and retinol acetate reduced the cadmium induced nephrotoxicity.

• 대한유전성대사질환학회지
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• 제15권1호
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• pp.35-39
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• 2015

중쇄 acyl-CoA 탈수소효소 결핍증은 미토콘드리아에 존재하는 효소 중 하나인 MCAD의 부족으로 인하여 적절한 지방산 산화가 이루어지지 못하는 대사질환으로 지방산 산화와 관련된 대사 질환 중 가장 흔한 형태이다. 다양한 임상증상으로 저혈당, 발달지연, 발작, 돌연사 등이 나타날 수 있다. 저자들은 신생아 선별검사상 C6, C8, C10:1 acylcarnitine, C8/C2 ratio 혹은 C8/C10 ratio의 증가를 보이는 무증상의 신생아에서 유전자 분석검사를 통해 MCAD 결핍증을 진단하였다. 생후 10개월 경, 고열을 동반한 전신 강직성간대경련 발생하였으나 혈액검사 상 저혈당은 관찰되지 않았고 발열 호전된 후 추가적인 경련은 없었다. 이후 생후 25개월까지 추적관찰 하였을 때 경련을 포함한 증상 없었고, 정상적인 성장과 발달을 보였다. 무증상의 신생아에서 신생아 선별검사를 통해 우연히 MCAD 결핍증으로 진단된 후 1회의 열성경련 발생하였으나 대사성 위기없이 정상적인 성장 및 발달을 보이고 있는 환아가 있어 이에 증례를 보고하는 바이다.

• 정보관리연구
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• 제39권4호
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• pp.215-240
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• 2008

이 연구에서는 MEDLINE과 CINAHL, IPA 등 3개 서지데이터베이스에 수록된 1984년부터 2003년까지 20년간의 문헌을 바탕으로 간염의 하위영역의 국가별 연구패턴과 우선순위에 대한 계량과학적 분석을 시도하였다. 이 연구에서는 연구자들의 간염연구분야의 전반적인 문헌분석에 대한 선행연구를 바탕으로 특히 하위영역에 대한 계량과학적 분석을 시도하였다. 간염분야의 주요 하위영역의 문헌은 23개로 세분되고 있으며, 1984-1993년의 기간중에는 일부 하위영역이 높은 우선순위를 차지하고 있었다. 하위영역의 우선순위가 높은 국가를 분석기간의 전반기와 후반기로 비교해 보면, 전반기(1984-1993)에는 미국(10개하위영역), 영국(9), 독일(8), 캐나다, 러시아, 네덜란드(각각 7) 순이었고, 후반기 (1994-2003)에는 독일(10), 영국(9), 미국(8), 캐나다, 러시아, 네덜란드(각각 7) 순이었다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제32권1호
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• pp.42-51
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• 2006

Schwann cell, one of important components of peripheral nervous system, interact with neurons to mutually support the growth and replication of embryonal nerves and to maintain the different functions of adult nerves. The Ara-C, known as an antimitotic agent, have been used to have high effectiveness in eliminating fibroblasts during Schwann cell culture period. This enrichment effect is also known to be cummulative with each successive pulse of Ara-C applied and is due to a progressive loss of fibroblasts. But the cytotoxicity by Ara-C is also cummulative and noticeable over the period. To determine the most effective application time and interval of Ara-C in the Schwann cell culture, we observed the Schwann cell purity and density with the Ara-C treatment in plain and three-dimensional culture from dorsal root ganglion of new born rat. By culturing dispersed dorsal root ganglia, we can repeatedly generate homogenous Schwann cells, and cellular morphology and cell count with mean percentages were evaluated in the plain culture dishes and in the immunostainings of S-100 and GFAP in the three-dimensional culture. The Ara-C treated cultures showed a higher Schwann cell percentage (31.0%${\pm}$8.09% in P4 group to 65.5%${\pm}$24.08% in P2 group), compared with that obtained in the abscence of Ara-C (17.6%${\pm}$6.03%) in the plain culture after 2 weeks. And in the three-dimensional culture, S-100 positive cells increased to 56.22%${\pm}$0.67% and GFAP positive cells to 66.46%${\pm}$1.83% in G2 group (p<0.05), higher yield than other groups with Ara-C application. Therefore, we concluded that the Ara-C treatment is effective for the proliferation of Schwann cells contrast to the fibroblasts in vitro culture, and the first application after 24 hours from cell harvesting and subsequent 2 pulse treatment (P2 group in plain culture and G2 group in three-dimensional culture) was more effective than other application protocols.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제33권2호
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• pp.114-120
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• 2007

The augmentation of soft tissue defects is one of the critical problems in the oral and maxillofacial surgery. Various types of graft materials, both autologous and non-autologous, have been used for the augmentation of soft tissue in the facial region. However, it is not easy to choose an ideal material for soft tissue augmentation because each has its advantages and disadvantages. An ideal graft material should meet the following criteria : it should not leave a scar at the area from which it was taken; should have less likelihood of causing infection; should feel natural after implanted; and should be not absorbed. Among the materials meeting these criteria, human dermis and artificial dermis are commonly used for clinical purposes. The present study was aimed to investigate and compare the resorption rate and the histological change following the use of the autologous dermis, the human homogenous dermis $Alloderm^{(R)}$, and the artificial dermis $Terudermis^{(R)}$ to reconstruct the soft tissue defect. Twenty mature rabbits of either sex, weighing about 2 ㎏, were used. Each rabbit was transplanted with the autologous dermis, $Alloderm^{(R)}$, and $Terudermis^{(R)}$ size $1{\times}1-cm$ at the space between the external abdominal oblique muscle and the external abdominal oblique fascia. They were then divided into 4 groups (n=5 each) according to the time elapsed after the surgery: 1, 2, 4, and 8 weeks. The resorption rate was calculated by measuring the volume change before and after the transplantation, and H-E stain was preformed to observe the histological changes. The resorption rate after 8 weeks was 21.5% for the autologous dermis, 16.0% $Alloderm^{(R)}$, and 36.4% $Terudermis^{(R)}$, suggesting that $Alloderm^{(R)}$ is the most stable while $Terudermis^{(R)}$ is the most unstable. In microscopic examinations, the autologous dermis graft was surrounded by inflammatory cells and showed foreign body reactions. The epidermal inclusion cyst was observed in the autologous dermis graft. $Terudermis^{(R)}$ and $Alloderm^{(R)}$ demonstrated neovascularization and the progressive growth of new fibroblast. The results suggest that $Terudermis^{(R)}$ and $Alloderm^{(R)}$ can be availably for substituting the autologous dermis.

• Clinical and Experimental Reproductive Medicine
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• 제43권2호
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• pp.133-138
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• 2016

Objective: To determine the incidence of embryo retention (ER) in the transfer catheter following embryo transfer (ET) in blastocyst transfer and investigate whether retransferring retained embryos has an impact on reproductive outcomes in patients undergoing in vitro fertilization-ET. Methods: We retrospectively analyzed the records of 1,131 blastocyst transfers, which comprised 223 single blastocyst transfer (SBT) and 908 double blastocyst transfer (DBT) cycles. Each SBT and DBT group was classified depending on whether ET was performed without retained embryos in the catheter during the first attempt (without-ER group) or whether any retained embryos were found following ET (ER group) for the purpose of comparing reproductive outcomes in a homogenous population. Results: The overall incidence of finding retained embryos was 2.8% (32/1,131). There were no retained embryos in SBT cycles. In DBT cycles, implantation rates (30.0% vs. 26.6%), positive ${\beta}-hCG$ rates (57.2% vs. 56.2%), clinical pregnancy rates (45.3% vs. 46.9%), and live birth rates (38.9% vs. 43.8%) were not significantly different between the without-ER and ER groups. There were no significant differences in the mean birth weight (g) $2,928.4{\pm}631.8$ vs. $2,948.7{\pm}497.8$ and the mean gestational age at birth ($269.3{\pm}17.2days$ vs. $264.2{\pm}25.7days$). A total of nine cases of congenital birth defects were found in this study population. Eight were observed in the without-ER group and one in the ER group. Conclusion: Our results suggest that retransfer of retained embryos does not have any adverse impact on reproductive outcomes in blastocyst transfer cycles. Furthermore, our results support finding that SBT might be advantageous for decreasing the incidence of retained embryos in catheters.

• 서비스연구
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• 제8권1호
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• pp.89-102
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• 2018

산업분류(Industrial Classification)는 산업활동의 종류를 체계적으로 구분한 것으로서, 모든 국가는 국가별 일정한 분류 방법에 의해 체계화된 표준산업분류(Standard Industrial Classification)를 운용하고 있다. 이를 바탕으로 자국의 산업활동과 관련한 통계조사를 통해 산업현황을 분석하거나, 관련 정책 수립에 활용하며, 또 국가 간 비교에도 이용하고 있다. 국제적으로는 2차 산업혁명 이후, 국가 간 경제 산업교류가 활발해지면서 국제적인 표준산업분류 기준의 필요성이 대두됨에 따라 유엔통계처(UNSD)는 영국의 경제학자 콜린 클라크가 1940년 산업을 1차(원시산업) 2차(가공산업) 3차(서비스산업)로 구분한 산업 3분류를 기초로 하여 1948년에 국제표준산업분류(ISIC)를 제정하였고, 대부분의 국가가 이를 원용하고 있다. 이러한 국제표준산업 분류(ISIC)와 각국의 표준산업분류는 제정 이후, 수차례 개정을 거쳐 현재에 이르고 있는데, 이들 표준산업분류가 거의 예외 없이 2000년대에 들어 대폭적인 개정이 이루어지고 있고, 그 개정 사유가 신생산업의 출현으로 인한 산업구조 변화를 반영하기 위한 것이라는 것과 그 개정 내용이 주로 3차산업 영역의 대분류 항목을 신설 세분하거나, 1 2차산업 영역 소속의 산업들이 3차산업 영역으로 소속 이동하는 형태라는 공통적 현상을 보이고 있다. 이에 본 연구는 이러한 공통적 현상의 발생 원인을 체계적으로 규명하고, 현 분류체계들의 문제점을 분석한 후, 서비스경제 관점에서의 새로운 산업분류체계의 방향을 고찰하고, 새로운 분류체계의 개념적 모델을 제안하였다. 향후 연구를 통해 본 제안 모델을 검증하고 신 분류체계 연구를 활성화할 필요가 있다.

• Journal of the Optical Society of Korea
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• 제19권6호
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• pp.705-710
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• 2015

The fabrication process of thin boron-doped nanocrystalline diamond (B-NCD) microelectrodes on fused silica single mode optical fiber cladding has been investigated. The B-NCD films were deposited on the fibers using Microwave Plasma Assisted Chemical Vapor Deposition (MW PA CVD) at glass substrate temperature of 475 ℃. We have obtained homogenous, continuous and polycrystalline surface morphology with high sp³ content in B-NCD films and mean grain size in the range of 100-250 nm. The films deposited on the glass reference samples exhibit high refractive index (n=2.05 at λ=550 nm) and low extinction coefficient. Furthermore, cyclic voltammograms (CV) were recorded to determine the electrochemical window and reaction reversibility at the B-NCD fiber-based electrode. CV measurements in aqueous media consisting of 5 mM K₃[Fe(CN)₆] in 0.5 M Na₂SO₄ demonstrated a width of the electrochemical window up to 1.03 V and relatively fast kinetics expressed by a redox peak splitting below 500 mV. Moreover, thanks to high-n B-NCD overlay, the coated fibers can be also used for enhancing the sensitivity of long-period gratings (LPGs) induced in the fiber. The LPG is capable of measuring variations in refractive index of the surrounding liquid by tracing the shift in resonance appearing in the transmitted spectrum. Possible combined CV and LPG-based measurements are discussed in this work.

• 대기
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• 제29권5호
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• pp.511-523
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• 2019

A new Korean Meteorological Administration (KMA) airborne measurement platform has been established for regular observations for scientific purpose over South Korea since late 2017. CRDS G-2401m analyzer mounted on the King Air 350HW was used to continuous measurement of CO₂, CH₄ and CO mole fraction. The total uncertainty of measurements was estimated to be 0.07 ppm for CO₂, 0.5 ppb for CH₄, and 4.2 ppb for CO by combination of instrument precision, repeatability test simulated in-flight condition and water vapor correction uncertainty. The airborne vertical profile measurements were performed at a regional Global Atmosphere Watch (GAW) Anmyeon-do (AMY) station that belongs to the Total Carbon Column Observing Network (TCCON) and provides concurrent observations to the Greenhouse Gases Observing Satellite (GOSAT) overpasses. The vertical profile of CO₂ shows clear altitude gradient, while the CH₄ shows non-homogenous pattern in the free troposphere over Anmyeon-do. Vertically averaged CO₂ at the altitude between 1.5 and 8.0km are lower than AMY surface background value about 7 ppm but higher than that observed in free troposphere of western pacific region about 4 ppm, respectively. CH₄ shows lower level than those from ground GAW stations, comparable with flask airborne data that was taken in the western pacific region. Furthermore, this study shows that the combination of CH₄ distribution in free troposphere and trajectory analysis, taking account of convective mixing, is a useful tool in investigating CH₄ transport processes from tropical region to Korean region in winter season.

• 정신신체의학
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• 제16권2호
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• pp.69-74
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• 2008

섬망은 의식의 장애와 인지 증상이 급성 발병을 하며 변동하는 경과를 보여주는 기질적인 정신과 증후군이다. 임상적 아형을 이상적으로 분류하기 위한 도구는 없지만 Lipowski(1983)가 섬망의 아형을 정신운동의 활동성을 기준으로 과활동성, 저활동성, 혼재성으로 분류한 이래로 연구자들 마다 다양한 도구를 이용하여 섬망의 아형을 임상적으로 구분하여 왔다. 그 연구 결과에 의하면 저활동성 섬망의 유병율이 과활동성 섬망에 비하여 오히려 많거나 적지 않은 것으로 보고되고 있지만 증상의 특성 때문에 저활동성 섬망의 임상적 진단이 적게 이루어지거나 우울증이나 치매 등으로 오인되는 경향을 보였다. 과활동성 섬망은 알코올 또는 벤조디아제핀 금단등에 의해 유발되며 도파민 과잉과 아세틸콜린의 결핍과 관련이 있으며 고역가 항정신병약물에 반응이 좋아 다른 아형에 비하여 예후가 양호한 반면에 저활동성 섬망은 대사성 뇌병증에 의한 경우가 흔하며 고역가 항정신병약물에 의한 반응이 예상보다 좋지 않는 경우가 있으며 임상적으로 정신자극제 치료가 효과적이라는 보고가 되고 있다. 입원 기간도 더 길고 인지 증상도 심하여 전반적으로 예후가 좋지 못한 경향이 있다. 섬망은 아형을 갖는 이질적인 증후군이다. 아형이 존재한다는 것은 아마도 각기 다른 기전에 의할 가능성을 시사하며 따라서 아형에 따라 구별되는 치료 전략이 필요할 것이다.