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金東弼,金元燮,金斗錫 全北大學校 1981 論文集 Vol.23 No.-
Recent increase in power supply capacity modernization and rationalization of high voltage distribution lines in korea requires electrically and mechanically more reliable insulators. The electical porcelain which has made today's EHV power transmission possible must be highly reliable in its mechanical strength as well as in electrical properties. Many studies have been made in search for a better porcelain that meets the requirements. This report portrays and compares various aspects and characteristics of electrical porcelains such as Conventional Porcelain, Alumina Porcelain and Cristobalite Porcelain in terms of their characteristics and applications. Also explained are the studies made on compression glaze, internal stress, size effect and electrical properties. Spiral rod line post insulators have been developed out of these needs and they have already demonstrated excellent performances in service. The outstanding features of these insulators are as follows. 1) As alumina porcelain is used, mechanical strength and power are resistibillity are excellent. 2) They are free from deterioration and puncture because of the solid core construction, virtually maintenance-free. 3) The insulation level is 1.5 times that of the existing pin type insulators. This strengthened insulation level is effective for preventing lightning flashover of the insulator and therefore it is also effective to protect insulated conductor from power arc melting breakage. 4) They show superior characteristics under heavy pollution conditions due to the antipollution design of insulator profile.
김영무,유원석 금오공과대학교 산업기술개발연구원 2000 産業技術開發硏究 Vol.16 No.-
In this paper, we give further properties of fully invariant subgroups and large subgroups of p-groups and obtain a representation theorem for large subgroups of p-groups.
중합광원과 레진 색상이 복합레진의 중합깊이에 미치는 영향
나준석,정선와,황윤찬,김선호,윤창,오원만,황인남 大韓齒科保存學會 2002 Restorative Dentistry & Endodontics Vol.27 No.6
Purpose of this research is estimating polymerization depth of different source of light. XL 3000 for halogen light, Apollo 95E for plasma arc light and Easy cure for LED light source were used in this study. Different shade (B1 & A3) resin composites (Esthet-X, Dentsply, U.S.A.) were used to measure depth of cure. 1, 2, and 3 mm thick samples were light cured for three seconds, six seconds or 10 seconds with Apollo 95E and they were light cured with XL-3000 and Easy cure for 10 seconds, 20 seconds, or 40 seconds. Vicker's hardness test carried out after store samples for 24 hours in distilled water. Results were as following. 1. Curing time increases from all source of lights. curing depth increased(p<0.05). 2. Depth (that except 1mm group and 2mm group which lighten to halogen source of light) deepens in all groups, Vicker's hardness decreased(p<0.05). 3. Vicker's hardness of A3 shade composite was lower in all depths more than B1 shade composites in group that do polymerization for 10 seconds and 20 seconds using halogen source of light(p<0.05), but group that do polymerization for 40 seconds did not show difference(p>0.05). 4. Groups that do polymerization using Plasma arc and LED source of light did not show Vicker's hardness difference according to color at surface and 1mm depth(p>0.05), but showed difference according to color at 2mm and 3mm depth(p<0.05). The results showed that Apollo 95E need more polymerization times than manufacturer's recommendation (3 seconds), and Easy cure need polymerization time of XL-3000 at least.
Lithium Tantalate 적외선 센서의 광전특성에 관한 연구
송재용,장충근,김석원 경북대학교 센서기술연구소 1990 센서技術學術大會論文集 Vol.1 No.1
스퍼터링(sputtering)으로 실리콘 기판위에 LiTaO_(3) 박막을 성장시켜서 비정질 적외선 센서를 제작하고, Crystal Technology회사에서 제공한 LiTaO_(3) 단결정으로 적외선 센서를 제작하여 그 특성을 비교하였다. 센서들의 출력신호, 잡음 및 검지도 등을 조사하여 본 결과 비정질 박막센서의 잡음은 두께가 얇을 수록 적었으며 단결정센서의 잡음 보다 적었다. 그러나 검지도는 단결정센서가 더 높았으며 전반적으로는 비정질 박막센서의 광전특성은 단결정 센서 보다 저조하였다. Amorphus LiTaO_(3) infrared sensors are fabricated with the thin film deposited by RF sputtering technique on silicon wafers, and single crystal infrared sensors were fabricated with the commerical LiTaO_(3) single crystal offered by Crystal Technology Ltd. The signal, the noise and the detectivity are measured, respectively. the noise of the thin film sensors decreases as the thickness decreases and it is smaller than that of the crystal sensors. But the detectivity of the single crystal sensors are higher and the overall photoelectric characteristics of the amorphous thin film sensors were inferior to those of the single crystal sensors.
다량의 하부위장관출혈이 병발된 Vibrio vulnificus 패혈증 1예
최주연,유진홍,한석원,이대훈,최민호,박순민,김연식,김선우,신완식,강문원,강성구 대한화학요법학회 1996 대한화학요법학회지 Vol.14 No.2
최근 저자들은 Vibrio vulnificus 감염에 의해 패혈증 및 이차성 피부 병변을 보인 42세의 남자 환자의 치료중 하부 위장관 출혈이 병발된 1예를 경험하였기에 보고하는 바이다. We experienced a case of Vibrop vulnificus septicemia which showed an unusual manifestation such as hematochezia. The patient was a 42-year-old man with chronic liver disease. The blood and wound culture revealed the organism. During intensive care, he suffered from massive hematochezi for several days. Colonoscopy and abdominal CT showed findings suspicious of ischemic colitis. To our knowledge, this is the first unusual case of V.vulnificus infection which showed massive lower gastrointestinal bleeding.
Kim, Sok Won,Oh, Seungmin,Lee, Kyuse Pergamon 2007 Radiation physics and chemistry Vol.76 No.11-12
<P><B>Abstract</B></P><P>With restrictions for environmental protection being strengthened, the thermoplastics reinforced with natural fibers (NFs) such as jute, kenaf, flax, etc., appeared as an automobile interior material instead of the chemical plastics. Regardless of many advantages, one shortcoming is the deformation after being formed in high temperature of about 200°C, caused by the poor adhesion between the natural fibers and thermoplastics. Also, the energy saving in connection with car air-conditioning becomes very important. In this study, the thermal conductivity, tensile strength, and deformation of several kinds of thermoplastic composites composing of 50% polypropylene (PP) and 50% natural fiber irradiated by the electron beam (energy: 0.5MeV, dose: 0–20kGy) were measured. The length and thickness of PP and NF are 80±10mm and 40–120μm, respectively. The results show that the thermal conductivity and the tensile strength changed and became minimum when the dose of electron beam is 10kGy, and the deformation after the thermal cycle were reduced by the electron beam.</P>
Nonvolatile Memory Characteristics of Double-Stacked Si Nanocluster Floating Gate Transistor
Kim, Eun-Kyeom,Kim, Kyong-Min,Son, Dae-Ho,Kim, Jeong-Ho,Lee, Kyung-Su,Won, Sung-Hwan,Sok, Jung-Hyun,Hong, Wan-Shick,Park, Kyoung-Wan The Institute of Electronics and Information Engin 2008 Journal of semiconductor technology and science Vol.8 No.1
We have studied nonvolatile memory properties of MOSFETs with double-stacked Si nanoclusters in the oxide-gate stacks. We formed Si nanoclusters of a uniform size distribution on a 5 nm-thick tunneling oxide layer, followed by a 10 nm-thick intermediate oxide and a second layer of Si nanoclusters by using LPCVD system. We then investigated the memory characteristics of the MOSFET and observed that the charge retention time of a double-stacked Si nanocluster MOSFET was longer than that of a single-layer device. We also found that the double-stacked Si nanocluster MOSFET is suitable for use as a dual-bit memory.
Fiber Optic Temperature Sensor Using a Grating on a Fiber Tip
Sok Won Kim,KyongTae Park 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.44 No.4
A new type ber optic sensor was developed which utilizes the interference between the diracted and the totally internally re ected laser beams from the grating produced by lithography and dry etching on a 45 angled ber tip. The performance was investigated in the range from room temperature to 1100 C by using a polarization modulator in order to eliminate the polarization dependence caused by the obliquely incident laser beam on the grating. The result shows that the variation of the signal intensity agrees well with the theoretically predicted pattern on the assumption that the phase change from the thermo-optic and thermal expansion coecients has to be treated as a linear function of temperature.