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 Sensitive and Patchable Pressure Sensors Mimicking Ion-Channel-Engaged Sensory Organs

Chun, Kyoung-Yong,Son, Young Jun,Han, Chang-Soo American Chemical Society 2016 ACS NANO Vol.10 No.4

<P>Biological ion channels have led to much inspiration because of their unique and exquisite operational functions in living cells. Specifically, their extreme and dynamic sensing abilities can be realized by the combination of receptors and nanopores coupled together to construct an ion channel system. In the current study, we demonstrated that artificial ion channel pressure sensors inspired by nature for detecting pressure are highly sensitive and patchable. Our ion channel pressure sensors basically consisted of receptors and nanopore membranes, enabling dynamic current responses to external forces for multiple applications. The ion channel pressure sensors had a sensitivity of similar to 5.6 kPa(-1) and a response time of similar to 12 ms at a frequency of 1 Hz. The power consumption was recorded as less than a few mu W. Moreover, a reliability test showed stability over 10 000 loading-unloading cycles. Additionally, linear regression was performed in terms of temperature, which showed no significant variations, and there were no significant current variations with humidity. The patchable ion channel pressure sensors were then used to detect blood pressure/pulse in humans, and different signals were clearly observed for each person. Additionally, modified ion channel pressure sensors detected complex motions including pressing and folding in a high-pressure range (10-20 kPa).</P>

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

고분자 전해질을 이용한 양이온교환막의 표면개질에 관한 연구

Kyoung Yong Chun,Han Sung Kim,Jeong Woo Han,Yung Il Joe ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.1

Commercial cation exchange membrane was modified using poly(1-alkyl-4-vinylpyridinium iodide) as polyelectrolyte. And the electrochemical properties and permselectivity between Ca^(2+) and Na^+ of the modified membrane were investigated. Ion exchange capacity, water content and specific conductivity of the modified membrane was lower than the original membrane(CL-25T). The smaller the molecular weight of polyelectrolyte was, the larger the adsorbed amounts were for same dipping time. As the adsorbed amounts were larger, permselectivity was increased, but specific conductance and ion flux were decreased. Permselectivity was also increased with the formular wight of alkyl group, and specific resistance of Na^+, Ca^(2+) was proportional to permselectivity.

Silver Nanoparticles Deposited on the Single - Walled Carbon Nanotubes by Simple Electroless Plating Method

Kyoung-Yong Chun,Sang Kyu Choi,Hyun Jung Kang,Chong Yun Park,Cheol Jin Lee 한국진공학회 2005 한국진공학회 학술발표회초록집 Vol.- No.-

Ultraviolet-induced irreversible tensile actuation of diacetylene/nylon microfibers

Chun, Kyoung-Yong,Choi, Changsoon,Baughman, Ray H,Kim, Seon Jeong IOP 2016 Smart materials & structures Vol.25 No.7

<P>Photomechanically irreversible tensile-actuated diacetylene-embedding nylon 6/6 microfibers were investigated. 10,12-pentacosadiynoic acid (PCDA) monomer, which have conventionally provided a visual color change by temperature and photo-driven stimuli, was embedded in nylon 6/6 microfibers by wet spinning. By ultraviolet (UV) (254 nm) exposure, we observed irreversible tensile actuation (contraction) of linear (untwisted) and helical (twisted) structural microfibers. The tensile contraction of twisted nylon 6/6-PCDA microfiber containing10 mM PCDA was reached to ∼2% at 60 °C. Such irreversible tensile contraction can be promoted by volume contraction of PCDA monomers during UV exposure along with irregular structural deformation containing gauche conformation with increasing temperature. The kinetics of tensile contraction with temperature and time were shown by the Arrhenius plots. The activation energies were 34.3–35.7 kJ mol<SUP>−1</SUP> as increasing the concentration of PCDA, implies that the nylon 6/6-PCDA microfibers could be applied to show time-temperature integrated device.</P>