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APCVD법을 사용한 보론 포스파이드의 증착 및 특성에 관한 연구
김순영,문병필,윤여철,전호승,김철주 서울시립대학교정보기술연구소 2001 정보기술연구소 논문집 Vol.3 No.-
Boron Phosphide films were deposited on the glass substrate at the low temperature, 550℃, by the reaction of B₂H_6 with PH₃ using CVD. N₂ was employed as carrier gas. The reactant gas rates were 50 ㎖/min for B₂H_6, 50 ㎖/min for PH₃ and 1.5ℓ/min for N₂. The films were annealed for 1hour, 3hours in N₂ambient at 550℃. The deposition rate was 1000Å/min and the refractive index of film was 2.6. The measurement of XRD shows that the films have the preferred orientation of (1 0 1). The data of VIS spectrophotometer show 75.49% for as-deposited, 76.71% for 1hr-annealed and 86.4 % for 3 hrs-annealed. The data of AFM show 73Å for as-deposited, 88.9Å for 1hr-annealed and 220Å for 3hrs-annealed. Also, The data of the secondary electron emission rate(γ) s how 0.317 for as -deposited, 0.357 for 1hr-annealed and 0.537 for 3hrs-annealed. And, The film shows the surface deposited thin film, bu using FT-IR, has the O-H bond and this bond is greatly decreased as annealing.
고추 1986年度 수集在來種의 裁培的 特性과 1987年度 蒐集在來種의 種果特性
金炳洙,李愚升,朴鉉圭,許宗汶,余淳南 慶北大學校 1988 論文集 Vol.46 No.-
Ten Korean local cultivars of pepper (Capsicum annuum) collected in 1986 were planted in the Kyungpook National University Experiment Farm to investigate growth characteristics. 'Punggakcho' was late in flowering, bearing large fruits, and high yielding. 'Kalmicho' was vigorous, good in fruit setting, and slightly resistant to bacterial spot but badly infected with powdery mildew. These two cultivars were the most promising materials for pepper breeding. Local cultivars collected in Younyang in Kyungpook such as 'Chilsungcho', 'Subicho', and 'Daehwacho' were poor in growth and suffered from viral complexes. As results, size and form of the original seed fruits was not reproduced but small and malformed fruits were produced. Collection of local cultivars of pepper was continued in 1987. Fruits of 14 local cultivars were collected in Youngwol in Kangwondo, Bonghwa and Munkyung in Kyungpook, Guchang in Kyungnam, and Jejudo, and their fruit characters were recorded.
LED를 이용한 복합레진의 광조사시, 중합수축의 속도와 양, 미세경도에 관한 연구
박성호,김수선,조용식,이순영,김도현,장용주,문현승,서정원,노병덕 大韓齒科保存學會 2003 Restorative Dentistry & Endodontics Vol.28 No.4
This study evaluated the effectiveness of the light emitting diode(LED) units for composite curing. To compare its effectiveness with conventional quartz tungsten halogen (QTH) light curing unit, the microhardness of 2mm composite, Z250, which had been light cured by the LEDs (Ultralume LED2, FreeLight, Developing product D1) or QTH (XL 3000) were compared on the upper and lower surface. One way ANOVA with Tukey and Paired t-test was used at 95% levels of confidence. In addition, the amount of linear polymerization shrinkage was compared between composites which were light cured by QTH or LEDs using a custom-made linimeter in 10s and 60s of light curing, and the amount of linear polymerization shrinkage was compared by one way ANOVA with Tukey. The amount of polymerization shrinkage at 10s was XL3000 > Ultralume 2, 40, 60 > FreeLight, D1 (P<0.05) The amount of polymerization shrinkage at 60s was XL3000 > Ultralume 2, 60 > Ultralume 2, 40 > FreeLight, D1 (P<0.05) The microhardness on the upper and lower surface was as follows; <본문 참조> It was concluded that the LEDs produced lower polymerization shrinkage in 10s and 60s compared with QTH unit. In addition, the microhardness of samples which had been cured with LEDs was lower on the lower surfaces than the upper surfaces whereas there was no difference in QTH cured samples.
송승찬,신진호,강석우,박경남,최호순,박근태,문희식,기춘석,이성희,윤병철,노우균,조균석,이민호 大韓應急醫學會 1998 대한응급의학회지 Vol.9 No.3
Tetrodotoxin is a neurotoxin produced by about 90 species of puffer fish and causes paralysis of central nervous system and peripheral nerves by blocking the movement of all monovalent cation. Ingestion of tetrodotoxin produces clinical manifestations such as paresthesias(within 10-45 min), vomiting, lightheadedness, salivation, muscle twitching, dysphagia, difficulty in speaking, convulsion and death that expressed by cardiopulmonary arrest with loss of brain stem reflex sometimes. Tetrodotoxin prevents or delays ischemia induced neuronal death by way of following 3 mechanisms. Firstly, it reduces the energy demand of the brain tissues. Secondly, it delays or even prevents anoxic depolarization. Finally, it deminishes ischemia induced cell swelling and cerebral edema. We report a case of puffer fish poisoning which presented with cardiopulmonary arrest and loss of brain stem reflex, but completely recovered by aggressive cardiopulmonary resuscitation.
서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1996)
김재홍,황동규,전재홍,김윤석,김중환,김용준,이창균,임동진,김현수,조창근,김경문,박상훈,전우형,김희성,이호정,차명수,김갑형,김형석,김석우,황지환,박병순,권오상,이민수,송기훈,성소영,이인섭,부태성 대한화학요법학회 1999 대한화학요법학회지 Vol.17 No.2
Background : In recent years, gonorrhea has been panedemic and remains one of the most commom STDs in the world, especially in developing countries. Objective & Methods: For the detection of a more effective therapeutic regimen and assessing the prevalence of PPNG, we have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results: In 1996, 139 strains of N. gonorrhoeae were isolated, among which 53(39.0%) were PPNG. Conclusion: Our results suggests that after a peak of 74.3% in 1993, the prevalence of PPNG in Seoul is gradually declining.
김병국,이영우,이문호,한진석,범희승,이정상,박석건,고창순,최성재,오연상,정준기 대한핵의학회 1986 핵의학 분자영상 Vol.20 No.2
Of 18 patients with Takayasus arteritis who underwent (99m)^Tc-MAA (macroaggregated albumin) perfusion luing seanning, 9 (50%) showed perfusion defects. Chest X-rays of them were nonspecific. One patient underwent (99m)^Tc-DTPA radioaerosoJ inhaIation lung scanning simultaneously, which revealed normal. So routine sr.reening radioisotope perfusion lung scanning is helpful to evaluate pulmonary arterial involnmement in Takayasu's arteritis patients. And Takayasus arteritis should be included in differential diagnosis of pulmonary embolism.
Jung, Soon-Won,Na, Bock Soon,You, In-Kyu,Koo, Jae Bon,Yang, Byung-Do,Oh, Jae-Mun Korean Physical Society 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.1
We demonstrate a novel organic antifuse technology on plastic at entirely plastic-compatible temperatures. All processes were performed at temperatures below 135 A degrees C. Our memory cell consists of a printed organic transistor and an organic capacitor. The data in the memory cell are selectively programmed by electrically breaking the capacitor. The organic capacitor acts like as an antifuse capacitor because it is initially open and becomes permanently shorted by applying a high voltage. The memory data are read out by sensing the current in the memory cell. The printed organic one-time programmable memory is suitable for storing small amounts of data such as in low-cost radio-frequency identification tag.
강문희(Mun Hee Kang),박솔(Sol Park),이상우(Sang Woo Lee),김현아(Hyun A Kim),이병태(Byung Tae Lee),엄익춘(Ig Chun Eom),김순오(Soon Oh Kim) 大韓環境工學會 2015 대한환경공학회지 Vol.37 No.4
나노기술의 이용도가 높아지면서 나노물질 유출로 인한 환경오염 문제가 제기되고 있다. 수질시료 내 나노물질의 분석을 위해서는 시료의 교란을 최소화할 수 있는 보관조건 마련이 선결 요건이지만, 아직까지 적합한 보관조건이 제시되고 있지 않다. 이에 본 연구는 citrate로 코팅된 은 나노물질(cit-AgNP)을 대상으로 금속나노물질을 함유한 수질시료의 보관조건을 제시하고자 수행되었다. 이를 위해 시간분해 동적산란법(time-resolved dynamic light scattering)을 이용하여 pH, 배경용액의 농도, 온도, 나노물질의 농도 등과 같은 환경적인 조건과 시간에 따른 cit-AgNP의 크기 변화를 관찰하였다. 실험을 통한 각환경조건별 AgNP의 응집특성을 해석하고 이러한 결과를 바탕으로 시료의 보관조건을 제시하였다. 그리고 AgNP의 입자농도와 응집속도의 선형적 관계로부터 구한 doublet time을 이용하여 시료의 보관기간을 산정하였다. 실험결과, pH는 7 이상, 배경용액(Ca(NO₃)2)의 농도는 3 mM 이하, 온도는 냉장(4℃) 상태, 그리고 cit-AgNP의 농도는 2 mg/L 이하에서 응집속도가 0에 가까운 값을 나타내었다. 또한 수질시료 내 존재하는 100 nm cit-AgNP의 농도를 환경에 존재할 수 있는 낮은 수준인 1 μg/L로가정한 후 doublet time를 구한 결과, 가능한 시료의 보관기간은 15.79~17.53일 정도인 것으로 조사되었다. 하지만 pH와 배경용액의 농도 조절은 시료의 변질과 교란이 우려되기 때문에 보관조건으로 일반화하여 제시하는 것은 적절하지 않고, 나노물질 자체의 농도를 조절하는 것은 수질시료 내 나노물질의 농도 등의 분석을 위한 시료의 보관조건으로 바람직하지 않다. 그러므로 본 연구의 결과로부터 일반화하여 제시할 수 있는 보관조건은 냉장(4℃) 상태에서 2주일 정도인 것으로 판단된다. A prerequisite for precise quantification of nanomaterials contained in environmental samples is to prepare suitable preservation conditions of samples. This study was initiated to suggest preservation conditions of aqueous samples for analyses of metal nanomaterials. Variation in the size of silver nanomaterial (cit-AgNP) was observed according to change in various conditions, such as pH, electrolyte concentration, temperature, nanomaterial concentration, and time. Aggregation of AgNP was characterized for each environmental condition, and finally proper preservation conditions of samples were proposed based on experimental results on AgNP aggregation. In addition, the preservation period of sample was computed by the doublet time of AgNP. The results indicate that the aggregation rate of cit-AgNP was close to 0 at the conditions of pH of ≥ 7, electrolyte (Ca(NO₃)2) concentration of ≤ 3 mM, temperature of 4℃, and cit-AgNP concentration of ≤ 2 mg/L. Furthermore, the experimental results on doublet time of cit-AgNP suggest that maximum preservation period was evaluated to be 15.79~17.53 days when the concentration of 100 nm cit-AgNP is assumed to be 1 μg/L which is considered as an environmentally-relevant concentration of engineered nanomaterials. Our results suggest that samples should be preserved at 4℃ and analyzed within 2 weeks.