브러시리스 직류 전동기의 센서리스 고속 특성 개선

송명현,박규남,우혁재 順天大學校 1998 論文集 Vol.17 No.1

This study applies sensorless strategy that is based on detecting of terminal voltages for sensing the rotor position in real time. And, by providing high PWM frequency, a current ripple and a torque pulsation are removed. Also, and accuracy of position detection at high speed are improved and a high speed operation range is expanded. The sensorless driving system is implemented with an IPM module and 87C196MC one-chip microcontroller. For confirming the validity of the proposed methods. experimental results from a prototype motor of rating 300W have shown. From the results of experiment, the Performance characteristics of high speed operation for permanent magnet brushless DC motor (BLDCM) driving systems are improved.

방사선 치료후 시간경과에 따른 염색체이상 빈도의 변화

송명재,하성환,이춘자,김희근,김미숙 대한방사선 방어학회 1994 방사선방어학회지 Vol.19 No.1

임파구의 염색체이상 빈도로부터 피폭자의 흡수선량을 구하는 방법은 사고로 인해 급성피폭을 받는 경우 유용하게 사용될 수 있다. 그러나 방사선 피폭 후 시간이 경과함에 따라 불안정 염색체이상을 가진 임파구는 감소하게 된다. 이에 방사선 치료후 시간 경과에 따른 불안정 염색체이상 빈도의 변화를 규명하고자 한다. 전골반에 50.4 Gy의 방사선 치료를 받은 총 20명의 자궁경부암 또는 자궁내막암 환자를 대상으로 41개의 검체를 얻었다. 채혈의 시기는 방사선 치료후 1일 3주, 6주, 12주, 24주, 52주, 104주, 156주, 208주, 520주로 하였다. 이들 말초혈액의 임파구에 대해 전혈미세배양을 실시한 후 임파구의 불안정 염색체이상을 관찰하여 Ydr, Qdr, Qdra를 얻었다. Ydr 값은 방사선 치료가 끝난 직후부터 3주까지 plateau를 보였고 이후 감소하는 경향이었다. Ydr의 평균값은 치료후 3주에 0.29에서 급격히 감소하여 2년후 0.05로 감소하였으며 이후 5년까지 서서히 감소하였다. 회귀분석을 실시한바 Ydr = 0.259×exp(-0.0429T)+0.0560×exp(-0.00106T)(time in weeks)로 나타났다. Qdr값은 치료 직후부터 24주까지 1.51 전후로 거의 변화가 없었으며 이후 감소하여 52주 이후에는 1.17 전후로 거의 일정하였다. Qdra 값은 치료 직후부터 12주까지 1.10 전후이며 이후 감소하여 52주 이후에는 0.81 전후였다. 피폭 후 시간경과에 따른 Ydr 값의 감소는 두 component exponential 모델을 잘 맞고 이 식을 이용하여 생물학적 선량측정이 가능하다. Qdr 값 및 Qdra 값은 피폭후 시간경과가 짧은 경우 피폭선량을 추정하는 지료로 사용할 수 있다. It is good method to use frequency of chromosome aberration in lymphocytes for a biological dosimetry in cases of accidental exposure to radiation. But in cases of past edposure, biological dosimetry is limited because the friquency of aberration decreases by time after exposure. To provide a basic data for estimationof past radiation exposure, the changing pattern of frequency of unstable chromosome aberration by time interbal after exposure was studied. Observation was made on peripheral lymphocytes of 41 blood samples from 20 patients treated for uterine cervical carcinoma and endometrial caricinoma. The patients received 50.4 Gy radiation to whole pelvis. Elapsed times after the completion of radiation therapy were 1 day, 3, 6, 9, 12, 24, 52, 104, 156, 208, 260 and 520 weeks. All the blood sample were microcultured. The Ydr, Qdr and Qdra were calculated form frequency of unstable aberration. Ydr did not decrease for 3 weeks after radiation therapy, and thereafter, decreased very rapidly and reached 0.05 at two years after radiation therapy and decreased very slowly until 5 years after radiation therapy. Relationship between unstable chromosome aberration and time interval after radiation therapy was described as Ydr = 0.2590.259×exp(-0.0429T)+0.0560×exp(-0.00106T)(time in weeks) Qdr remained constant at 1.51 until 24 weeks after radiation therapy and then decreased to 1.17 at 52 weeks. Therafter, it did not change. Qdra remained constant at 1.10 for 12 weeks after radiation therapy and decreased to 0.81 at 52 weeks. Thereafter, it remanined constant. Two superimposed exponential Ydr disappearance rate wuggests that it is possible to calculate the past exposure dose. When the elapsed time after exposure is short, Qdr and Qdra are useful papameters for biological dosimetry for past radiation exposure.

담관계 감염증에서 혈액 및 담즙배양 균주의 특성과 항생제 감수성

송재훈,이철환,김양수,이성구,이근찬,민영일,김명환 대한감염학회 1994 감염 Vol.26 No.1

During a three-year period, 600 patients were admitted to the Asan Medical Center because of biliary tract diseases. Both aerobic and anaerobic cultures were performed in 313 patients with cholangitis (bile : 253, blood : 113, both : 53). Of these patients, 189 were positive(bile 159. blood 68. both 38). The most common organisms were E. coli, K pneumoniae, and P. aeruginosa in both bile(respectively, 49.7%, 20.8%, 51.5%) and blood cultures(respectively, 45.6%, 26.5%, 22.1%). Antibiotic therapy did not sterilize bile, but selectively increased the proportions of P. aeruginosa. There was no significant difference in biliary bacteriology according to the history of biliary surgery, or the presence of percutaneous biliary drainage or underlying disease. More than 95% of gram-negative organisms isolated was highly susceptible to imipenem and amikacin. P. aeruginosa was resistant to ceftazidime in 63.3% which might be associated with overuse of the drug during the study period. Further studies will be necessary in patients with cholangitis to determine whether newer antibiotics replace previous combination therapy.

PWR 발전소에서의 방사선장 특성

송명재,김희근,김봉환,장시영 대한방사선 방어학회 1992 방사선방어학회지 Vol.17 No.2

국내 원전의 주종인 가압경수로를 대상으로 스펙트로메트리 기법에 의한 감마, 중성자 그리고 베타 방사선장애 대한 특성조사를 수행하였다. 감마선장의 경우, HPGe 반도체 검출기로 구성된 휴대용 감마 스펙트로메타를 사용하여 측정한 결과, 평균 에너지 값의 분포는 가동정지중일 때 원전의 격납용기내에서 440∼780keV, 가동중일 때 원전의 보조건물내에서 280∼760keV로 나타났다. 가동중인 원전의 격납용기내 operation deck를 중심으로 5개 지점에 대하여 BMSS(Bonner Multiple Spectrometry System)을 사용하여 중성자선장을 조사하였다. BUNKI 코드를 사용하여 측정스펙트럼을 분해하였으며, 측정 장소에서의 평균 에너지 값의 분포는 20∼210keV이었다. 베타피폭원인 오염에 대하여 가동정지 상태인 원전의 격납용기내와 보조건물의 총 14개 지점의 고 방사성 오염지역에서 smearing 시료를 채취하여 표면장벽형 Si 반도체 검출기를 사용하여 에너지 스펙트럼을 측정하였다. 그 결과 부식생성물 60Co에 의한 베타 에너지가 지배적인 것으로 나타났다. Pheton, neutron and beta radiation fields were measurement at PWR plants which are the representative types of nuclear power plant operated in Korea. The photon energy spectra were measurement at locations in the auxiliary building during operation period and in the containment vessel(C/V) during shutdown period using a portable gamma spectrometer with a HPGe detector. The distribution of average energy was found to range from 440 to 780 keV in the C/V and from 280keV to 760keV in the auxiliary building respectively. The average neutron energy measured at the five locations round the operation deck in the C/V in operation using a BMSS(Bonn Multi-Sphere Spectrometer)ranged from 20 keV to 210keV. A computer code, BUNKI was used to unfold the spectrum. The beta energy spectra in the C/V asnd in the auxiliary building in annual outage were determined using 14 smear samples taken from the highly contaminated areas. The analysis showed that representative corrosion product, ??Co made main contribution to the beta energy field.

Ionized Calcium 및 Chitosan의 혼합처방에 따른 항균효과에 관한 연구

송명수,김미정,김영일,최동성,양재헌 又石大學校 1998 論文集 Vol.20 No.-

The antibacterial effects of chitosan depend on its molecular weight. The inhibition rate of bacteria growth of designated high in Gram positive, which was high in S aurens, S. epidermidis and Bacillus subtilis, low in S. mutans, high in C. albicans in fungi, low in A. niger. The inhibition rate of bacteria growth of chitosan was comparatively high in Gram positive, low in S. mutans and it showed high numerical value in C. albicans of fungi. The rate recorded good result at molecular weight 200,000 relatively, there was no difference, according to the molecular weight. The inhibition rate of bacteria growth according to the concentration of the increased differently between 1,000~10,000㎍/㎖, it showed antibacterial activity close to the inhibition rate of growth of chitosan rather than ionized calcium. The minimum inhibitory concentration marked the highest in the mixture of cihtosan and ionized calcium for all kind of bacteria generally, there was a little difference between yeast and fungi.

열형광선량계에 의한 선량평가 알고리즘 개발

송명재,김희근,하정우,이태영,윤석철 대한방사선 방어학회 1992 방사선방어학회지 Vol.17 No.2

본 연구의 목적은 ANSI N13. 11-1983의 시험기준에서 제시한 개인선량계의 선량평가 시험범주를 모두 만족시킬 수 있는 선량평가 알고리즘을 개발하는데 있다. 알고리즘 개발 대상 개인선량계로는 Teledyne Isotopes사의 PB-3 열형광선량계로 하였다. 개발된 알고리즘에 대한 미국 Atlan-Tech사와의 2차례의 검증결과, 본 알고리즘은 ANSI N-13. 11-1983의 선량평가 범주를 모두 만족시키는 것으로 나타났다. The purpose of this study is to develop an algorithm of TLD dose evaluation to meet all requirements stated in ANSI N13. 11-1983. It made the PB-3 TLD of Teledyne Isotopes an object of the development. Personal dosimetry performance testings of the development algorithm have been performed twice through the Atlan-Tech, INC. in accordance with the criteria of testing described in ANSI N13. 11-1983. As a result, it is assured that the developed algorithm has complied with all requirements stated in ANSI N13-1983.

저장용기 및 저장온도에 따른 김치의 품질변화

송주은,김명선,한재숙 동아시아식생활학회 1995 동아시아식생활학회지 Vol.5 No.2

맛있는 김치의 저장기간을 연장시키기 위하여 여러가지 저장용기와 저장온도를 달리하여 각 군마다 5포기씩의 김치를 담그고 각각에 The effects of storage containers and storage temperatures on Kimchi quality were investigated. The results were summarized as follows : 1. Pabix, poly ethylene-back+plastic container, tupper-ware were much better than crock, stainless steel, and plastic container in keeping Kimchi. However, there was no significant differences between containers in the sensory test for Kimchi. 2. Kimchi stored at 18±2℃ was the most delicious, which revealed pH 4.30, acidity 0.45-0.50%, and salt concentration 3.10wt% in the 4th days after storage whereas sensory score for Kimchi quality was very low in the 12th days after storage. 3. PH in Kimchi stored at 5℃ after fermentation at 18±2℃ was slowly decreased as compared to the Kimchi stored at 18±2℃ after fermentation. 4. PH and acidity showed no significant changes after 90 days storage when Kimchi was stored at -5℃ or -80℃ were compared to that of the Kimchi stored at 18±2℃, but texture score of Kimchi stored at -5℃ or -80℃ after fermentation at 18±2℃, but texture score of Kimchi stored at -5℃ or -80℃ were compared to that of the Kimchi stored at 18±2℃ after fermentation. 5. In the group of Kimchi stored at 10℃, immediately after pickling it took 48days until the best conditions which were pH 4.30 and acidity 0.45-0.50% were matched. 6. The most promising method in keeping good taste and good quality of Kimchi was to store Kimchi at 5℃ after 4days fermentation at 18±2℃. And, for long period preservation of Kimchi, it took would be effective to store at -80℃ after fermentation at 18±2℃.

생활체육의 발전과정과 전망

송명섭,유재광 충주대학교 학생생활연구소 2000 學生生活硏究 Vol.7 No.-

전류측정에 의한 전동기 고장 진단

송명현,김재현 순천대학교 공업기술연구소 1998 工業技術硏究所論文集 Vol.12 No.-

This paper discusses the diagnosis of motor for detecting the air gap eccentricity, broken rotor bars and outlace fault of bearing. For developing of the on-line monitoring system, a simple method of current spectral analysys is proposed. Though it is processed within a limited range of frequency for simplicity, but it can be obtained the possible detecting frequency for monitoring the some motor faults. The experimental results give the proper frequency and amplitude dB levels for detecting the motor faults.

알코올의 섭취가 흰쥐의 혈액과 간의 지질대사에 미치는 영향

이명숙,김영연,김효숙,김매하,전진순,서진숙,송선미,양영재,윤원손,이미라,이효영,정승현 誠信女子大學校 生活文化硏究所 2004 生活文化硏究 Vol.18 No.-

To investigate the effects of ethanol on the lipid metabolism in blood and liver, twenty one male Sprague Dawley rats had orally taken the 25% alcohol and 50% alcohol by 5g per Kg of weight during 3 weeks after the adjusting period. For the energy balance, 85% sucrose and 45% sucrose was added in control group and 25% alcohol group each. The weight was reduced by alcohol treatment according to the levels, otherwise the weight of liver and heart was little increased in alcohol groups rather than in control without significance. Moreover, RBC, WBC, hemoglobin and hematocrit were increased by alcohol treatment according to the levels without significance. Otherwise, adjusted bilirubin levels by 100g of weight was significantly increased by alcohol treatment dose dependently. Alcohol induced RBC degradation and increased circulated bilirubin because of liver damage. For blood lipid profiles, blood cholesterol was increased in 50% of alcohol group compared to that of 25% and control groups, otherwise, blood triglycerides (TG) was increased by 30% in 25% alcohol groups rather than in control but not significantly different. The hepatic lipid composition, cholesterol levels in alcohol treatment groups was lower than those in control. The hepatic TG was not influenced by alcohol treatment. The two reasons of decreasing hepatic lipids were suggested by 85% sucrose of control for energy balance more synthesized cholesterol and TG than those in 25 or 50% alcohol groups, and by cholesterol and TG could not be synthesized because of liver damage from alcohol.