• 분석과학
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• 제22권3호
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• pp.201-209
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• 2009

국내에서 유통 중인 동물성 생약 38개 품목 총 325개 시료를 대상으로 ICP-MS와 수은자동분석기기를 이용하여 납, 카드뮴, 비소, 수은의 오염실태 조사를 수행하였다. 검출된 농도 범위는 납 $0.02{\mu}gkg^{-1}$ $(D.L){\sim}11.29mgkg^{-1}$, 카드뮴 $0.01{\mu}gkg^{-1}$ $(D.L){\sim}2.50 mgkg^{-1}$, 비소 $0.12{\mu}gkg^{-1}$ $(D.L){\sim}5.27mgkg^{-1}$이었으며, 수은의 경우 검출 범위를 초과한 한 개의 시료를 제외하면 $0.01{\sim}77.11mgkg^{-1}$으로 나타났다. 전체 동물성 생약 38품목 중 납, 카드뮴, 비소, 수은 모두가 잔류허용기준치 이하로 검출된 동물성 생약은 별갑과 오배자 2개 품목이었고, 22개 품목에서 납의 오염이 가장 큰 비중을 차지하였다. 수은의 경우 농도 범위가 비교적 넓게 나타난 녹각 등 16개 품목뿐만 아니라 전체 시료의 54.46%가 잔류허용기준치를 초과하였다. 따라서 납과 수은에 대한 지속적인 실태조사를 실시하고 오염원인 추적을 위한 연구가 수행되어야 할 필요가 있는 것으로 나타났다.

• 한국멀티미디어학회논문지
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• 제17권6호
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• pp.733-740
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• 2014

With the development and spread of 3D display, users can easily experience an augmented reality with 3D features. Therefore, the demand for content of an augmented reality is exponentially growing in various fields. A traditional augmented reality environment was generally created by CG(Computer Graphics) modelling production tools. However, this method takes too much time and efforts to create an augmented environment. To create an augmented environment similar to the real world, everything in the real world should be measured, gone through modeling, and located in an augmented environment. But the time and efforts spent in the creation don't produce the same environment as the real world, making it hard for users to feel the sense of reality. In this study, multi-scale 3D panorama content augmented system is suggested by using a depth-map. By finding matching features from images to add 3D features to an augmented environment, a depth-map is derived and embodied as panorama, producing high-quality augmented content system with a sense of reality. With this study, limits of 2D panorama technologies will be overcome and a sense of reality and immersion will be provided to users with a natural navigation.

• 소음진동
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• 제9권1호
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• pp.163-173
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• 1999

Precise and reasonable modelling is necessary and indispensable to the analysis of dynamic characteristics of mechanical structures. Also. the effective prediction of the change of modal properties due to the variation of design parameters is required especially for the application of finite element method to the structural dynamics problems. To meet those necessity and requirement, three model updating algorithms are proposed for finite element methods. Those algorithms are based on sensitivity analysis of the modal data obtained from experimental modal analysis(EMA) and analytical modal analysis(AMA). The adapted sensitivity analysis methods of the algorithms are 1)eigensensitivity(EGNS) method. 2)frequency response function sensitivity(FRFS) method. 3)sensitivity based element-by-element method (SBEEM), Singular value decomposition(SVD) is used for performing eigenanalysis and parameter estimation in the updating process. Those algorithms are applied to finite element of a plate and the updating capability of each algorithm is compared in terms of accuracy. reliability and stability of the updating process. It is shown that the model updating method using frequency response function is superior to the other methods in view of various updating capabilities.

• 한국분무공학회지
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• 제18권1호
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• pp.16-20
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• 2013

The investigation was conducted to analyze the exhaust emission characteristics in diesel engine according to intake air mass flow. In this study, the test diesel engine with a 5,899 cubic centimeter displacement and power of the 260 ps was used to analyze the emission characteristics according to the intake air mass flow. In addition, the test modes were applied by the ND-13 and ETC mode. In order to analyze the emission characteristics, the engine dynamometer with 440 kW and emission gas analyzer (AMA-4000) were utilized. From the experimental results, it is revealed that the NOx and HC emissions in the intake air mass flow of large amount have high levels compared to those in the intake air mass flow of small amount in the ND-13 mode. However, the PM emission was shown the opposite trend in the NOx and HC emission due to the trade-off relation between the NOx and PM.

• 한국자동차공학회논문집
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• 제10권5호
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• pp.9-14
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• 2002

The durability prediction of emission control components, especially 02 sensor and catalytic converter, is getting more important as emission regulation is getting stricter and vehicle durability mileage requirement is also extended from 80,000 ㎞ to 160,000 km in Korean market. And the duration of vehicle mileage accumulation to get vehicle exhaust emission deterioration factor for certification is required to be shorter in order to reduce the vehicle development time. Since most of the vehicle emission development tests are done on chassis dynamometer and aging bench by using vehicle aging modes, real road condition and in-use driving patterns must be reflected into them to predict the vehicle emission level and to meet emission regulation especially at high mileage. In order to get the frequent driving pattern of vehicle and the aging characteristic of emission components, a vehicle was tested by changing drivers and driving roads around Seoul. Real road driving patterns were analyzed and compared with those of the certification modes which are well known in automotive industry.

• Journal of Korean Neurosurgical Society
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• 제65권2호
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• pp.173-179
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• 2022

Disabilities can emerge due to traumatic spinal fractures. In terms of sacrococcygeal spine, because of its unique anatomic structure with minimal movement, the possibility for it to have a disability is relatively low. In Korea, unlike most disability criteria, private insurance companies acknowledge angular deformities caused by vertebral fractures as disabilities according to their degree, so there were several cases where patients required compensation, arguing angular deformity caused by sacrococcygeal fracture, which in some cases led to legal conflicts. Except the Act Welfare of Persons with Disabilities which recognizes only severe angular deformity affecting internal organs as disability and the industrial accident disability evaluation which does not recognize coccygeal fracture as disability but rarely recognizes sacral vertebra deformity equivalent to compressive deformation, there is little or no case where angular deformity is recognized as disability. Given the impairment evaluation standards in social insurance, McBride system, American Medical Association (AMA) guides, and newly proposed standards by the Korean Academy of Medical Sciences (KAMS), the most contentious point in the general terms and conditions of private insurance is spinal deformity. To overcome controversy over disability evaluation, the private insurance sector is now applying criteria for axial skeleton to sacrococcygeal vertebrae through revision of standards. Under these circumstances, it is fair to recognize sacrococcygeal fracture as impairment in terms of the pelvis only when the fracture leaves serious deformity and neurological symptoms with clear relevancy. Though it may not be easy to develop accurate disability evaluation standards, improvement is necessary to remove any irrationalities and make the standards as objective as possible.

• 보험의학회지
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• 제27권2호
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• pp.96-106
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• 2008

다음은 위의 모든 결과를 바탕으로 디스크 질환의 입원기간이 길어지고 재발이 일어날 수 있는 나쁜 조건 (NEGATIVE)과 그 반대인 좋은 조건(Positive)을 table로 정리하였다. 좋은 조건은 같은 추간판 탈출 기왕력자라고 하더라도 예후에 긍정적인 가능성을 주는 조건이다. 따라서 심사할 때 table를 토대로 고지내용이 좋은 조건인지, 나쁜 조건인지 판단 할 수 있고 추가 질문사항을 요청하는데 도움이 될 수 있을 것이다. 만약 입원을 했더라도 며칠을 입원했는지. 재수술을 하였다면 어떻게 했는지, 직장인의 경우 현재 어떤 조건인지, 수술을 했다면 구체적으로 수술명이 무엇인지, 수술 후 술, 담배를 하였는지, 수술 후 현재 상태가 어떤지에 따라 인수 여부를 결정하는데 도움이 될 것이라고 생각한다.

• Applied Biological Chemistry
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• 제41권1호
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• pp.53-59
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• 1998

수종의 두과작물과 수도에서 분리한 Rhizobium 및 Azospirillum들의 내염성을 조사하고 salt stress에 의하여 유도되는 균주의 생리적 특성 및 식물이나 미생물에서 osmoprotectant 로 작용하는 proline, glycine betaine 및 glutamate가 질소고정균의 생육이나 질소고정력에 미치는 영향을 연구하였다. 분리된 대부분의 질소고정균들은 0.6 M NaCl 농도에서 생육이 현저히 감소되었지만 Acacia rhizobia sp86 은 1.4 M NaCl 농도에서도 생육이 가능하였다. Osmotic stress에 의하여 증가되는 intracellular 유리아미노산은 Rhizobium 및 Azospirillum에서 glutamate 였으며, 특히 Acacia rhizobia sp86은 salt stress에 의하여 5배정도 glutamate를 축적하였다. Osmoprotectant (proline, glycine betaine, glutamate)를 배지내에 1 mM 첨가함으로서 salt stress에 의하여 감소되는 질소고정균의 생육과 질소고정력을 방지하였으며, glycine betaine이 가장 효과적이었다.

• Asian Pacific Journal of Cancer Prevention
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• 제17권11호
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• pp.4977-4982
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• 2016

Introduction: Elevated serum interleukin (IL) 6 has been reported in patients infected with the hepatitis C virus (HCV), but it remains debatable whether this influences the production of autoantibodies and the biochemical profile of HCV disease. Therefore, this current study was conducted to evaluate the relationship between IL-6 and circulating autoantibody levels in HCV positive patients. Methods: Levels of IL-6 in serum samples from 102 patients with HCV and 103 normal controls were determined by enzyme linked immunosorbent assay (ELISA). Autoantibodies were detected by immunofluorescence. Results: Levels of IL-6 were significantly higher (p=0.028) in patients infected with (HCV) compared with normal group. Autoantibodies were noted in in 43.1% of the patients; of these, 23.5% featured anti-nuclear antibodies (ANA+), 16.7% anti-smooth muscle antibodies (ASMA+), 7.8% anti-mitochondrial antibodies (AMA+), 17.6% anti-parietal cell antibodies (APCA+), 7.8% anti canalicular antibodies, and 2.9% anti reticulin antibodies (ARA+). No patients were found to be positive for anti-brush border antibodies (ABBA) or anti-ribosomal antibodies. (ARiA). No links with IL-6 levels were apparent. Conclusions: IL-6 levels are increased in patients infected with HCV disease and could influence the production of autoantibodies. However, this study did not provide evidence of a specific relationship between IL6 and circulating autoantibodies in such cases.

• 한국분말재료학회지
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• 제12권4호
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• pp.279-283
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• 2005

In this study, the ZnS composite powders for host material in phosphor was synthesized in situ by mechanical alloying. As the mechanical alloying time increases, particle size of ZnS decreases. ZnS powders of $1.85\;\mu{m}$ in a mean size was fabricated by mechanical alloying for 10h. The crystal structures of ZnS powders were investigated by X-ray diffraction and the photo-luminescence properties was evaluated with the optical spectra analyzer. The steady state condition of mechanically alloyed ZnS was obtained as a mean particle size of $2\;\mu{m}$ in 5h milling. The sphalerite and wurtize structures coexist in the ZnS mechanically alloyed for 5h. The ZnS powder mechanically alloyed for 10h grows to the sphalerite structure. And the strong emission peaks of ZnS are observed at 480 nm wave length at the powders of mechanically alloyed for 10h, but the sphalerite and wurtize structures in ZnS coexist and emission peaks are not appeared at the powders of mechanically alloyed for 10h.