• 제목/요약/키워드: Iron object

검색결과 58건 처리시간 0.03초

한국 미취학 아동의 영양성 빈혈에 관한 연구 (A Study on Nutritional Anemia of Pre-school Children in Korea)

  • 채범석;주덕숙
    • Journal of Nutrition and Health
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    • 제4권1호
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    • pp.1-19
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    • 1971
  • Nutritional anemia is an important nutritional problem affecting large population groups in most developing countries. Nutritional anemia is caused by the absence of any dietary essential involed in hemoglobin formation or by poor absorption of these dietary components. The most likely causes are lack of dietary iron, and folate, vitamin $B_{12}$ and high qualify protein. Anemia is considered to be a late mainfeastation of nutritional deficiencies, and even mild anemia is not the earilest sign of such a deficiency. Therefore, the object of therapy is to correct underlying deficiency rather than merely its manifestation. Iron deficiency anemia is generally much the most common form of anemia. And it is very prevalent particularly in pregnant women and young children, especially under five year of life. According to the rapid growth rate of infants, dietary iron should he provided for infants over three months of age in adequate amounts for the synthesis of hemoglobin required by the increasing blood volume and for the demands of newly formed cells. The principal causes of iron deficiency anemia are an inadequate dietary iron content, interference with absorption of iron from the intestine, excessive losses of iron from the body, disturbance of iron metabolism by infection, and social and cultural environments. The present study is planned to obtain informations concerning nutritional anemia through anthropometric and biochemical determinations for the assessment of nutriture in pre-school children. Determination was taken in 226 pre-school children in ruraI arae in 1968, 122 pre-school children in 1970, and 1526 hospitalized pre-school children in 1970. The results of this study are as follows; (1) According to Iowa Malnutrition Borderline (85 percentile) for weight, the proportions of underweighed pre-school boys and girls in rural area were 47.2% and 46.2% in1968, and were 36.1% and 51.8% in 1970. According to Iowa Malnutrition Borderline for height, the proportions of underheight boys and girls in rural area were 30.5% and 33.7%, and were 26.2% and 21.8% in 1970. Malnutrition scores of underweight for height values of boys and girls in rural area were 19.3 and 17.3 in 1968, and the scores of boys and girls were 15.6 and 15.5 in 1970. (2) The mean hemoglobin values of boys and girls in rural area were $11.2{\pm}1.8g/100ml\;and\;11.4{\pm}1.6g/100ml$ in 1968. In 1970, the mean values of boys and girls in rural area were $11.3{\pm}1.3g/100ml\;and\;11.7{\pm}2.4g/100ml$. The mean hemoglobin values of hospitalized boys and girls were $11.9{\pm}2.2g/100ml\;and\;11.7{\pm}2.4g/100ml$ in 1970. It is found that 92 of 215 children (42.7%) in rural area had concentrations of hemoglobin less than 11.0g/100ml in 1968. In 1970, 55 of 121 children (45.4%) in rural area and 559 of 1526 hospitalized children (36.6%) had concentrations of hemoglobin less than 11.0g/100ml. (3) The mean hematocrit levels of hospitalized boys and girls were $35{\pm}26.8%\;and\;35.4{\pm}6.4%$ in 1970. And 443 of 1334 hospitalized children (33.2%) had hematocrit values below 33%. (4) The average mean corpuscular hemoglobin concentration levels of hospitalized boys and girls were $32.4{\pm}2.2\;and\;32.3{\pm}2.2$ in 1970. And 1016 of 1352 hospitalized children (75.1%) had the mean corpuscular hemoglobin values below 34. (5) The mean iron values of young children in rural area and hospitalized children were $62.0{\pm}6.3{\mu}g/100ml\;and\;60.7{\pm}22.8{\mu}g/100ml$. The proportions of anemia cases below $50{\mu}g/100ml$ in rural area was 37.9%, and 34.3% in hospitalized children. (6) The mean total iron binding capacity of young children in rural area was $376{\pm}57.88{\mu}g/100ml,\;and\;342.2{\pm}6.15{\mu}g/100ml$ in hospitalized children. (7) The average transferrin saturation percentage of young children in rural area was $16.9{\pm}4.7%,\;and\;18.0{\pm}8.4%$ in hospitalized children. The proportions of anemia cases below 15% of young chi1dren in rural area and hospitalized children were 48.3% and 41.2%. Therefore, authors wish to recommend that the following further studies should be undertaken: (1) Standardization of simplied laboratory examination of nutritional anemia. (2) The prevalence of nutritional anemia and the requirements of iron, folate, and vitamin $B_{12}$ of pre-school children. (3) The content and absorption of iron in Korean food. (4) The pathogenesis of nutritional anemia and prevention of parasitic disease. (5) Maternal health and nutrition education.

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공주 수촌리 출토 칠기 칼집의 보존 (Conservation of the Lacquered Sheath Excavated from Soochon-ri, Gongju, Korea)

  • 이용희;연정아;박정혜;김수철
    • 박물관보존과학
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    • 제14권
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    • pp.1-5
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    • 2013
  • 공주박물관에서 의뢰한 공주 수촌리 출토 봉상의 칠기 칼집을 보존처리 및 분석을 하였다. 이 칠기는 철제유물들과 일괄 수습되었다. 전체적으로 외압에 의해 파손되어 있었으며 일부 칠기 편은 철 산화물에 부착되어 있고 손실된 부분도 있었다. 먼저 X-ray 촬영을 통해 함께 출토된 금속구와의 관계를 파악하고 칠 도막에 대한 분석을 하여 제작기법에 대해 연구하였다. 그 후 보존처리를 하여 원래의 형태를 구현하고자 하였으며, 보관 및 전시를 위한 보호틀을 제작하였다.

객체지향적 분석에 따른 SMIL 구조변환 및 모델링 (Enhancement of SMIL by Changing Structure and Modeling Depending Upon Object Oriented Analysis)

  • 권오현
    • 한국멀티미디어학회논문지
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    • 제7권9호
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    • pp.1304-1311
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    • 2004
  • SMIL(Synchronized Multimedia Integration Language)은 각종 멀티미디어 데이터들 간의 동기화를 지원해 주며 데이터 요소들의 화면 구성을 편리하게 해줌으로써 인터넷 환경의 가상강의, 방송 등에서 널리 활용되고 있다. 응용분야가 다양하게 확대됨에 따라 각각의 환경에 융통성 있게 적용할 수 있는 체계의 필요성이 증대되고 있는 추세이며 이에 따라 SMIL 기능도 계속적으로 진화되고 있다. 본 논문에서는 SMIL의 주요 기능을 객체 지향적 방법론에 따라 분석, 모델링 한 후 서비스 컴비네이터 (service combinator) 개념의 클래스 모델을 제안하여 설계함으로써 필요시 사용자들이 자기 환경에 맞게 튜닝 할 수 있도록 하였다.

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Foreign Body Removal in Children Using Foley Catheter or Magnet Tube from Gastrointestinal Tract

  • Choe, Jae Young;Choe, Byung-Ho
    • Pediatric Gastroenterology, Hepatology & Nutrition
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    • 제22권2호
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    • pp.132-141
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    • 2019
  • Foreign body (FB) ingestion of children is a common pediatric emergency requiring medical attention. Pediatric emergency physicians and gastroenterologists often encounter nervous and distressed situations, because of children presenting with this condition in the common clinical practice. When determining the appropriate timing and indications for intervention, physicians should consider multiple patient- and FB-related factors. The utilization of a flexible endoscopy is considered safe and effective to use in these cases, with a high success rate, for the effective extraction of FBs from the gastrointestinal tract of a child. Additionally, a Foley catheter and a magnet-attached Levin tube have been used for decades in the case of FB removal. Although their use has decreased significantly in recent times, these instruments continue to be used for several indications. Using a Foley catheter for this purpose does not require special training and does not necessarily require sedation of the patient or fluoroscopy, which serve as advantages of utilizing this method for foreign object retrieval. An ingested magnet or iron-containing FB can be retrieved using a magnet-attached tube, and can be effective to retrieve an object from any section of the upper gastrointestinal tract that can be reached. Simple and inexpensive devices such as Foley catheters and magnetattached tubes can be used in emergencies such as with the esophageal impaction of disk batteries if endoscopy cannot be performed immediately (e.g., in rural areas and/or in patients presenting at midnight in a facility, especially in those without access to endoscopes or emergency services, or in any situation that warrants urgent removal of a foreign object).

에틸알코올 용매를 이용한 주조철제유물의 탈염 실험 연구 (Experimental Study of Desalting Methods Using Ethyl Alcohol for Archaeological Cast Iron Objects)

  • 이혜연;조주혜
    • 보존과학회지
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    • 제31권2호
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    • pp.95-104
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    • 2015
  • 주조철제유물은 발굴 후 보존환경이 맞지 않은 경우 부식이 급속하게 진행되며 특히 블록형 파손이 발생하고 최종에는 분말화 된다. 따라서 부식 요인, 즉 $Cl^-$ 이온을 제거하는 탈염처리가 중요하다. 그러나 주조철제유물은 탈염과정 중 형태가 파손되는 경우가 빈번히 발생하여 탈염 과정을 생략하거나 탈수 등의 안정화처리로 그치는 경우가 많다. 기존의 탈염 방법은 주로 물을 이용한 알칼리 수용액 방법이다. 그러나 물의 수산화이온은 부식을 촉진시키고 높은 표면 장력으로 내부 균열을 확대시켜 주조철제유물의 탈염 과정 중 파손 원인으로 판단된다. 따라서 본 연구에서는 표면 장력이 낮은 에틸알코올을 이용하여 탈염을 실시하고 그 탈염 효과를 알아보았다. 실험 결과 에틸알코올 탈염방법은 상온의 알칼리 수용액 방법과 유사하거나 더 높은 $Cl^-$ 이온 용출 효과를 보여주었다. 또한 에틸알코올 방법은 수용액 방법보다 유물의 파손이 적고 Fe의 용출이 거의 없어 탈염의 안전성 측면에서 우수함을 확인하였다. 본 실험은 현장적용 가능한 유기 용매 탈염 방법을 검토한 것으로 추가 연구를 통하여 주조철제유물의 안전하고 효율적인 안정화 방안을 마련하고자 한다.

$\gamma$-선 Radiography에 있어서의 피사체 산란선에 관한 연구

  • 허남;야고이명
    • Nuclear Engineering and Technology
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    • 제4권3호
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    • pp.223-228
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    • 1972
  • Radiography에 있어서 피사체로부터의 산란 ${\gamma}$선은 film상의 상질을 나쁘게 하는 큰 요소중에 하나이다. 피사체로부터의 산란선량을 조사하기 위하여 여러가지 폭의 slit에 의한 조사장에서의 film의 흑화농도를 구했다. 또 그때의 투과측정기 검출감도의 양부도 검토했다. 피사체가 두꺼워지면 산란선량이 증가하여 결함검출도가 저하하지만, slit폭을 좁힘으로써 개선할 수가 있었다. 그러고 선원은 $_{60}$Co을 사용했고 시료는 철로서 실험을 했다.

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퍼지제어를 이용한 마이크로 로보트 핑거의 힘제어 (Force Control of Micro Robotic Finger Using Fuzzy Controller)

  • 류재춘;박종국
    • 한국지능시스템학회논문지
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    • 제7권5호
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    • pp.67-76
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    • 1997
  • In this paper, a theoretical study is presented for the force control of a miniature robotic manipulator which is driven by a pair of piezo-electric bimorph cells. In the theoretical analysis, one finger is modeled as a flexible cantilevers with a force sensor at the tip and the finger is a solid beam. The robotic finger is used to hold the objects with different stiffness such as an iron block and a living insect and a moving objcet. So it is very important to develop an adequate controller for the holding operation of the finger. The main problems in force controlling are overdamping, overshoot and unknown environment(such as the stiffness of object and unknown plant parameters). So, the main target is propose the new fuzzy compensation for unknown environment and incease the system performance. The fuzzy compensation is implemented by using PI-type fuzzy approach to identified unknown environment. And the result of proposed controller was compared with the conventaional PID and optimal controller.

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Determination of Nitrogen Abundance Ratio from Low-Resolution Stellar Spectra

  • Kim, Changmin;Lee, Young Sun
    • 천문학회보
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    • 제45권1호
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    • pp.58.2-58.2
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    • 2020
  • We present a method for determining the abundance ratio of nitrogen to iron ([N/Fe]) from low-resolution (R~2000) stellar spectra from large spectroscopic surveys such as Sloan Digital Sky Survey (SDSS) and Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). The basic idea of the method is to match a grid of synthetic spectra with an observed spectrum in the CN band region around 3883 Å. To calibrate our estimate of [N/Fe], we make use of the giants observed in Apache Point Observatory Galaxy Evolution Experiment (APOGEE), which are also observed in the SDSS. This method will be applied to the Galactic halo stars to determine [N/Fe], and the measured nitrogen abundance ratios will be used to investigate the C-N anti-correlation, which is observed in globular clusters, to trace their origin with their kinematic properties.

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ESTIMATION OF NITROGEN-TO-IRON ABUNDANCE RATIOS FROM LOW-RESOLUTION SPECTRA

  • Kim, Changmin;Lee, Young Sun;Beers, Timothy C.;Masseron, Thomas
    • 천문학회지
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    • 제55권2호
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    • pp.23-36
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    • 2022
  • We present a method to determine nitrogen abundance ratios with respect to iron ([N/Fe]) from molecular CN-band features observed in low-resolution (R ~ 2000) stellar spectra obtained by the Sloan Digital Sky Survey (SDSS) and the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). Various tests are carried out to check the systematic and random errors of our technique, and the impact of signal-to-noise (S/N) ratios of stellar spectra on the determined [N/Fe]. We find that the uncertainty of our derived [N/Fe] is less than 0.3 dex for S/N ratios larger than 10 in the ranges Teff = [4000, 6000] K, log g = [0.0, 3.5], [Fe/H] = [-3.0, 0.0], [C/Fe] = [-1.0, +4.5], and [N/Fe] = [-1.0, +4.5], the parameter space that we are interested in to identify N-enhanced stars in the Galactic halo. A star-by-star comparison with a sample of stars with [N/Fe] estimates available from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) also suggests a similar level of uncertainty in our measured [N/Fe], after removing its systematic error. Based on these results, we conclude that our method is able to reproduce [N/Fe] from low-resolution spectroscopic data, with an uncertainty sufficiently small to discover N-rich stars that presumably originated from disrupted Galactic globular clusters.

선형 이상체에 의한 벡터 자력 및 자력 변화율 텐서 반응식 (Closed-form Expressions of Vector Magnetic and Magnetic Gradient Tensor due to a Line Segment)

  • 임형래
    • 지구물리와물리탐사
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    • 제25권2호
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    • pp.85-92
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    • 2022
  • 한쪽 방향으로 연장된 이상체를 멀리 떨어져서 관측하면 선형 이상체로 근사가 가능하다. 이런 경우 자력 및 자력 변화율 텐서를 적용하기 위해서는 선형 이상체에 대한 해석해가 필요하다. 따라서 이 논문에서는 선형 이상체에 대한 자력과 자력 변화율 텐서 반응식을 유도하였다. 벡터 자력은 기존에 유도한 선형 이상체에 대한 중력 변화율 텐서를 포아송 관계식을 이용하여 벡터 자력으로 변환하여 유도하였다. 자력 변화율 텐서는 벡터 자력를 기준 직교 좌표계의 성분으로 한번 더 미분하여 유도하였다. 시추공에서 얻은 총자력 탐사 자료를 가정하고, 선형 이상체의 길이, 방향, 자력 모멘트를 비선형 역산 방법으로 추정하는 사례를 보여주었다.