식물 중이 유기인제 유기염소제 및 카바메이트제 살충제의 다성분 스크린법에 관한 연구

전옥경,이용욱 서울大學校保健大學院 1996 國民保健硏究所硏究論叢 Vol.6 No.1

A multiresidue method(MRM) for insecticides is an efficient way to screen a large number of samples for multiple pesticides in a relatively short time period. There are numerous MRMs testing for a single class of compounds such as organophophorus(OP), organochlorine(OC), n-methyl carbamate(MC) insecticides, but few screen for these insecticides with a single sample extraction. The main objective of the use of MRMs is to determine as many pesticides of different chemical structure as possible in various types of samples of known or more often of unknown origin in a single procedure. The proper application of MRMs requres knowledge of extractability of different compounds from various types of samples, the distribution properties in solvent systems of different polarity, elution patterns in column chromatographic systems, the loadability and selectivity of chromatographic separation and the specificity and sensitivity of detection. For the determination of pesticide residues such a multitude of methods has been described that a complete survey of literature is very difficult for the analyst. However, by far the majority of these methods consist of a few working steps such as extraction with a limited number of solvents, liquid-liquid partitioning, adsorbent column chromatography or gel permeation chromatography and the determination, mostly with GLC, TLC, or HPLC. For the various pesticides groups they differ only in some details (e.g. amount and activity of obsorbents, composition and polarity of solvent mixtures) selected according to the attributes of the residues to be analysed and the co-extractives to be separated. The objective of this paper is to give some guidance on the application of the various processes used in the general scheme of MRMs by comparing some well established methods covering a wide range of pesticides.

난소절제가 흰쥐 대동맥의 미세구조에 미치는 영향

최용귀,전영희,백태경,백두진,정호삼 대한해부학회 1994 Anatomy & Cell Biology Vol.27 No.2

건축공사시방서에서의 KS규격의 국제인증방안에 관한 연구

김경식,이재섭,김용수,이규진,조용훈,최완철,전재열,이현수,구재동,이기환 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1

The purpose of this research is make out construction specifications for International Construction. Using off-shore products incur cost increase and longer delivery term of construction. and inconvenient on International Construction. Expand the range of additional local products conforming to performance. Life Cycle Cost. maintainability. operability. user's acceptability, etc.. And this study is suggest the standard formats and the techniques for construction specification.

호중구감소증 환자에서의 기관-기관지 아스페르길루스증 1예

권재철,송명준,김기조,오유경,김성용,박선희,최수미,이동건,이석,신완식,김춘추 대한감염학회 2004 감염과 화학요법 Vol.36 No.1

저자들은 급성 림프구성 백혈병 환자에서 항암치료 후 호중구감소증이 지속되는 상태에서 침습성 아스페르길루스증의 드문 형태인 치명적인 아스페르길루스 기관기관지염을 경험하고 문헌고찰과 함께 증례를 보고하는 바이다. Tracheobronchial aspergillosis is an uncommon clinical form of invasive aspergillosis, particularly found in patients with AIDS and in lung transplant recipients than in other immunocompromised patients. The rapidity of the disease progression can result in fatal airway obstruction in a short period of time that the patient may need emergency tracheostomy without knowing the cause of the obstruction. We describe a case of fatal tracheobronchial aspergillosis which developed in a 43-year-old female patient with acute lymphoblastic leukemia. Dyspnea and stridor developed on the 20th day after 2nd consolidation chemotherapy, which was during the prolonged neutropenic period. Airway narrowing was observed on the computed tomograph scan of neck and emergency tracheostomy was performed. Infiltration with aspergillus hyphae was found in the tracheal ring and bronchial mucosa. Despite the use of amphotericin B, the patient died of bleeding and airway obstruction.

폐 실질과의 누공을 형성한 대동맥궁 동맥류 1례

위준선,한승철,정승태,윤영윤,정경운,문정미,전병조,허탁,민용일 대한응급의학회 2003 대한응급의학회지 Vol.14 No.2

Massive hemoptysis represents a major medical emergency that is associated with high mortality. The causes of hemoptysis are various and include pulmonary and cardiovascular disorders and trauma. The causes of pulmonary disorder are tuberculosis, bronchiectasis, abscess, malignancy, bronchitis, and fungal infection. The causes of cardiovascular disorder are mitral stenosis, pulmonary embolism, and congestive heart failure. A fistula between an aortic aneurysm and the pulmonary parenchyma is one of the causes of hemoptysis, but it is a rare. However, if undiagnosed, it is a uniformly fatal cause of massive hemoptysis. This is a case of bleeding from a fistula between an aortic arch aneurysm and a lung parenchyma in a patient with an aortic arch aneurysm who presented with massive hemoptysis. He had suffered intermittent hemoptysis since he was diagnosed with an aortic arch aneurysm three years before. A high clinical suspicion must be maintained when a history of intermittent hemoptysis is obtained in patients with an aortic aneurysm or prior aortic graft surgery.

Highly conductive, printable and stretchable composite films of carbon nanotubes and silver

Chun, Kyoung-Yong,Oh, Youngseok,Rho, Jonghyun,Ahn, Jong-Hyun,Kim, Young-Jin,Choi, Hyouk Ryeol,Baik, Seunghyun Springer Science and Business Media LLC 2010 Nature nanotechnology Vol.5 No.12

Free-standing nanocomposites with high conductivity and extensibility

Chun, Kyoung-Yong,Kim, Shi Hyeong,Shin, Min Kyoon,Kim, Youn Tae,Spinks, Geoffrey M,Aliev, Ali E,Baughman, Ray H,Kim, Seon Jeong IOP Pub 2013 Nanotechnology Vol.24 No.16

<P>The prospect of electronic circuits that are stretchable and bendable promises tantalizing applications such as skin-like electronics, roll-up displays, conformable sensors and actuators, and lightweight solar cells. The preparation of highly conductive and highly extensible materials remains a challenge for mass production applications, such as free-standing films or printable composite inks. Here we present a nanocomposite material consisting of carbon nanotubes, ionic liquid, silver nanoparticles, and polystyrene–polyisoprene–polystyrene having a high electrical conductivity of 3700 S cm<SUP>−1</SUP> that can be stretched to 288% without permanent damage. The material is prepared as a concentrated dispersion suitable for simple processing into free-standing films. For the unstrained state, the measured thermal conductivity for the electronically conducting elastomeric nanoparticle film is relatively high and shows a non-metallic temperature dependence consistent with phonon transport, while the temperature dependence of electrical resistivity is metallic. We connect an electric fan to a DC power supply using the films to demonstrate their utility as an elastomeric electronic interconnect. The huge strain sensitivity and the very low temperature coefficient of resistivity suggest their applicability as strain sensors, including those that operate directly to control motors and other devices.</P>

Patchable, flexible heat-sensing hybrid ionic gate nanochannel modified with a wax-composite.

Chun, Kyoung-Yong,Choi, Wook,Roh, Sung-Cheoul,Han, Chang-Soo RSC Pub 2015 Nanoscale Vol.7 No.29

<P>Heat-driven ionic gate nanochannels have been recently demonstrated, which exploit temperature-responsive polymer brushes based on wettability. These heat-sensing artificial nanochannels operate in a broad temperature-response boundary and fixed liquid cell environment, thereby experiencing limited system operation in the flat and solid state. Here we have developed a patchable and flexible heat-sensing artificial ionic gate nanochannel, which can operate in the range of the human body temperature. A wax-elastic copolymer, coated onto a commercial nanopore membrane by a controlled-vacuum filtration method, was used for the construction of temperature-responsive nanopores. The robust and flexible nanochannel heat sensor, which is combined with an agarose gel electrolyte, can sustain reversible thermo-responsive ionic gating based on the volumetric work of the wax-composite layers in a selective temperature range. The ionic current is also effectively distinguished in the patchable bandage-type nanochannel for human heat-sensing.</P>

Thin multi-walled carbon nanotubes synthesized by rapid thermal chemical vapor deposition and their field emission properties.

Chun, Kyoung-Yong,Jung, Seung Il,Choi, Hae Young,Kim, Jong-Uk,Lee, Cheol Jin American Scientific Publishers 2009 Journal of Nanoscience and Nanotechnology Vol.9 No.3

<P>Thin multi-walled carbon nanotubes (MWCNTs) were successfully synthesized by a rapid thermal chemical vapor deposition (RTCVD) method using a liquid catalyst. The growth of the thin MWCNTs was achieved by decomposition of C2H2 over Fe-Mo/MgO/citric acid directly at 700 degrees C for 30 min. Most thin MWCNTs, which had about 6 approximately 8 graphene layers, showed high purity (approximately 90%) and good crystallinity. Moreover, they showed homogenous morphology and uniform diameters. The average outer diameter of the thin MWCNTs was about 8 nm. The uniform diameter and good homogeneity of thin MWCNTs were mainly attributed to prevention of catalyst agglomeration at high temperature due to a short reaction time, and the high purity of thin MWCNTs was caused by suppression of the residual CNT growth after finishing a reaction in RTCVD process. Field emission properties of the thin MWCNTs were measured in a vacuum chamber at a pressure of less than 2 x 10(-7) Torr. The turn-on field was about 3.35 V/microm at the emission current density of 0.1 microA/cm2, and the emission current density was 2.5 mA/cm2 at an applied field of 6.7 V/microm. Particularly, the thin MWCNTs showed strong emission stability at emission current density of 0.8 mA/cm2 for 20 h.</P>

Highly dispersed multi-walled carbon nanotubes in ethanol using potassium doping

Chun, Kyoung-Yong,Choi, Sang Kyu,Kang, Hyun Jung,Park, Chong Yun,Lee, Cheol Jin Elsevier 2006 Carbon Vol.44 No.8

<P><B>Abstract</B></P><P>We demonstrated the production of an effective dispersion of multi-walled carbon nanotubes (MWCNTs) in ethanol using potassium doping (π-stacking interaction). The homogeneous dispersion of individual MWCNTs was achieved without any contamination or severe disruption at the end caps or periphery of the tubes. Potassium as a doping material, phenanthrene as a nonpolar molecule, and 1,2-dimethoxyethane as a dipole solvent were used for our experiment. From UV–visible spectroscopy and visual observation, it was found that the dispersibility of the MWCNTs in ethanol was about 14mg/dm<SUP>3</SUP>. High resolution transmission electron microscopy and Raman spectroscopy showed that disruption of the end caps of the tubes and severance along the tube axis were rarely found. The scanning electron microscopy and corresponding EDX results indicated that the key to the dispersion mechanism was the potassium doping, which is driven by π-stacking complex formation. We suggest that the dispersion of the MWCNTs was influenced by the potassium doping, which caused the enlargement and separation of the entangled-MWCNT networks, and was not affected by defects or modification of the surface morphology.</P>