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T-2 Toxin이 병아리 비장세포의 유전질 발생에 미치는 영향
전향숙,정덕화,이서래 이화여자대학교 생명과학연구소 1994 생명과학연구논문집 Vol.5 No.-
시험관 내에서 T-2 toxin이 병아리 비장세포의 blastogenesis에 미치는 영향을 살펴본 결과, B-cell mitogen인 lipopolysaccharide및 T-cell mitogen인 concanavalin A자극에 대해 T-2 toxin의 농도가 증가함에 따라 억제정도가 증가하는 경향을 나타내었다. 노출시기를 달리하여 T-2 toxin을 투여한 병아리 비장세포에서 mitogen 자극에 대한 반응을 알아 본 결과, 부화하기 전과 후에 계속 T-2 toxin에 노출시킨 실험군은 가장 영향을 많이 받은 것으로 나타났고 부화전 혹은 부화후 어느 한 시기에만 T-2 toxin에 노출된 실험군은 비교적 영향을 적게 받는 것으로 나타났다. The effects of T-2 toxin of mitogen-induced blastogenesis of chick splenic cells were investigated. The[^3H]thymidine incorporation in splenic cells stimulated by lipopolysaccharide and concanavalin A were equally inhibited as the concentration of T-2 toxin was increased. The effective dose of T-2 toxin causing a 50% reduction of[^3H]thymidine incorporation was inbetween 1.0 and 5.0 ng/㎖ for both mitogens. Mitogen-induced blastogenesis in chick splenic cells showed differences among experimental groups with different exposure time of T-2 toxin, exhibiting the most inhibition in the experimental group exposed to T-2 toxin at both embryonic and chick periods.
한덕수,장영민,전봉준,김성준 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B
As an automobile fuel, LPG has many environmental advantages compared to gasoline or diesel. However, current LPG engine which is provided with LPG fuel as gas form has lower power and worse fuel efficiency than gasoline engine. These problems of low power and bad fuel efficiency come from lower volumetric efficiency. Also there is a new rising problem of high failure ratio in an engine emission test. Although there are many factors which affect engine performance of exhaust gas emission, one believes that the fact that ECM of gasoline engine is used for LPG engine when retrofitting gasoline engine to LPG engine is one of the main problems, which lower engine power and emit more noxious gas due to wrong ignition timing. To solve these problems, one studied the effects ignition timing on the exhaust gas to find out the optimum condition of ignition timing. The experimental results show that noxious exhaust gas is reduced and engine power is increased if the optimum control of ignition timing is applied in accordance to the revolution speed of engine.
한덕수,장영민,전봉준,김성준 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.A
As an automobile fuel, LPG has many environmental advantages compared to gasoline or diesel. However, current LPG engine which is provided with LPG fuel as gas form has lower power and worse fuel efficiency than gasoline engine. These problems of low power and bad fuel efficiency come from lower volumetric efficiency. Also there is a new rising problem of high failure ratio in an engine emission test. Although there are many factors which affect engine performance of exhaust gas emission, one believes that the fact that ECM of gasoline engine is used for LPG engine when retrofitting gasoline engine to LPG engine is one of the main problems, which lower engine power and emit more noxious gas due to wrong ignition timing. To solve these problems, one studied the effects of ignition timing on the exhaust gas to find out the optimum condition of ignition timing. The experimental results show that noxious exhaust gas is reduced and engine power is increased if the optimum control of ignition timing is applied in accordance to the revolution speed of engine.
요하지통 환자에서 두 개의 캐눌라를 이용한 박동성 고주파 신경근 응고술의 임상 연구
김천숙,배재영,배덕구,강규식,안기량,권진형,김지은,유시현 순천향의학연구소 2003 Journal of Soonchunhyang Medical Science Vol.9 No.1
Dorsal root ganglion(DRG) block by the local anesthetics and steroids which has done classically in low back pain(LBP) patients with radiculopathy has high incidence of recurrence rate and side effects of steroids. Recently a new technique of pulsed radiofrequency thermocoagulation(P-RFTC) was introduced and substituted for it because of the benefits such as relatively low recurrence rate, low risk of nerve injury and comfort during the procedure. We experienced 15 patients who had LBP with radiculopathy and no or little response to epidural steroid injection. When we performed DR ganglionotomy by P- RFTC under the C-arm guide in these patients, we tried to approach the exact DR ganglion using tow cannulas - the one for obtaining patient's subjective symptoms and injection of contrast dye, the other for making a RF lesioning after identifying the impedance of sensory and motor stimulation. In conclusion, DR ganglionotomy by P- RFTC using two cannulas in LBP patients is an easy and safe procedure with satisfactory results.
김천덕,차경환 釜山水産大學校 1989 釜山水産大學 硏究報告 Vol.29 No.1-2
This paper has described the efficiency for the new method of the active control of the duct noise which is adaptive filtering application by experiment which set the additional sound source. Firstly the active noise control system becomes stable since the acoustic feed back quantity can be set under -30 dB by setting the additional sound source at an excite of duct and for the signal which is supplied to additional sound source by the setting the microphone at the upstream of duct. Secondly, since the noise of duct output and additional sound source constructs dipole source, radiating power will be decreasing over all the direction in comparison with the case without the additional sound source in the range of frequency which the distance between the duct and the additional sound source is shorter than wave length that is a center frequency of the duct noise. The result of noise cancelling amount for simulation and fan noise experiment by the active control system has been attenuated about 5∼6 dB by only using the proposed active control system and about 9∼10 dB can be attenuated by using adaptive filtering algorithm with the proposed active control system on the desired frequency band.
2차 전지의 방전에 의한 수소-공기 혼합가스의 점화에 관한 연구
이춘하,권병덕,오종용 한국안전학회 2004 한국안전학회지 Vol.19 No.3
This papers describes on the experimental consideration for the intrinsically-safe explosion-proof capability of rechargeable battery's body about main item, rechargeable battery and cellular phone battery which is selling in domestic that IEC(Intemational Electrotechnical Commission) recommend the measurement of ignition limit by short circuit of rechargeable battery and temperature increase test to use a explosion grade Group ΠC type of explosion-proof type apparatus test an object of hydrogen gas. Because of that, there are many different results for existence or nonexistence for ignition by different company and different types. It is concluded that the maximum of self temperature increasing by spark circuit of rechargeable battery is 180℃ in case of Nickel-Hydrogen, and 110C in case of Nickel-Cadmium. The reaction of cellular battery for external temperature have following processes. It is confirmed that the temperature of reaction is rise slantly as the ambient temperature rising, then exterior shape of one is swell up and change when the temperature of ambient reach to about 130~140℃, and when reach to about 160℃ the battery is blown up. Therefore, it is considered that have to be in considering selection of rechargeable battery using in itself due to different ignition limits of various rechargeable battery when the portable electric containing rechargeable battery are designed, produced and used, the characteristics and the proper safety factors of devices.
삼각피판법과 밀라드씨법을 겸한 술식에 의한 선천 성구순열교정의 치험예
강동훈,전건수,김덕래 大韓成形外科學會 1987 Archives of Plastic Surgery Vol.14 No.1
There are several well established methods of primary cleftlip repair. Nowadays, traingular flap method and rotation advancement flap method are most widely used and regarded as a method of choice for the repair of cleft lip. However, in cases with severe vertical height difference between cleft side and non cleft side, both methods have some problems. With the Millard`s method for the repair in these cases, the incision of rotation flap must be extended to the philtral column on the noncleft side. This induces a break in the upper part of philtrum and it is not always easy to achieve smooth continuity of the Cupid`s bow. With the triangular flap method for the repair in these cases, large traingular flap has to be designed for lengthening. It produces fairly noticeable scar on the philtrum and divides the philtrum into two parts. Onizuka reported a method in which a small triangular flap was added together with that of Millard in 1966. Y, Nishimura modified Onizuka method in 1978. We performed a method in which triangular flap was put on the end of vermilion ridge with Millard`s method for the repair of cleft lip in cases which vertical hight differences are severe, usually more than 5mm in length in the infant. The result of this method is proved to be very successful and eliminates or reduces the problems previously described. ―Advantages of this method― 1. Permit lengthening even in severe forms without making large z-plasty scar in the philtrum. 2. Preserve philtral dimple and column better than triangular flap method. 3. Natural appearence of the upper part of philtrum. 4. Better correction of nasal deformties than triangular flap method. 5. Good muscle anatomic realignment. 6. In the Second stage operation of bilateral cleft lip, expected lengthening can be achieved without making protrusion of the lower margin of the prolabium.
조성준,신동천,정용,이덕희,Patrick N. Breysse 한국환경독성학회 2002 환경독성보건학회지 Vol.17 No.2
Volatile organic compounds (VOCs) are an important public health issue in Korea and many important questions remain to be addressed with respect to assessing exposure to these compounds. Because they are ubiquitous and highly volatile, special techniques must be applied in their analytic determination. Valid personal exposure assessment methods are needed to evaluate exposure frequency, duration and intensity, as well as their relationship to personal exposure characteristics. Biological monitoring is also important since it may contribute significantly in risk assessment by allowing the estimation of effective absorbed doses. This study was onducted to establish the environmental measurement, personal dosimetry and biological monitoring methods for VOCs. These methods are needed to compare blood, urinary and exhalation breath VOC levels and to provide tools for risk assessment of VOC exposure. Passive monitors (badge type) and a active samplers (trap) for the VOCs collection were used for air sampling. Methods development included determining the minimum detectable amounts of VOCs in each media, as well as evaluating collection methods and developing analytical procedures. Method reliability was assessed by determining breakthrough volumes and comparing results between laboratories and with other methods. A total capacity of trap used in this study was 60ℓ. Although variable by compound, the average breakthrough was 20%. Also, there was no loss of compounds in trap even if keep for 45 day in -70℃. The recovery of active and passive methods was 69%~126% and method detection limit was 0.24㎍/trap and 0.07㎍/badge. There was no statistical difference (P>0.05) between active and passive methods.