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서동철,이홍재,조주식,박현건,김형갑,허종수 한국환경농학회 2003 한국환경농학회지 Vol.22 No.1
농어촌 등에서 소규모로 발생하는 하수를 환경친화적이고 높은 하수처리효율을 유지하면서 하수처리장의 장기간 사용을 위한 최적의 여재를 선정하기 위하며 자연정화공법을 이용한 소형하수처리장치를 호기성조 및 혐기성조로 구분하여 시공한 다음, 하수처리량 및 여재 입경별 수처리 효율을 조사하였고, 호기성조와 혐기성조에서 여재 입경별 하수의 투수속도를 조사한 결과는 다음과 같다. 호기성조 처리수 및 방류수중의 pH 및 EC는 여제입경에 따라서 별 차이가 없었고, 용존산소는 호기성조를 동과한 호기성조 처리수의 용존산소는 큰 폭으로 증가하였으나 혐기성조를 통과한 방류수의 용존산소는 호기성조 처리수에 비해 약간 감소하여 여재입경 및 하수처리량에 따라서 별 차이가 없이 약 2.4~5.1 mg/L정도이었다. BOD,000 및 탁도 처리율은 여재 대(4~10 mm)를 사용했을 경우에도 호기성조 처리수에서 BOD 처리율은 약 91%이상, COD 처리율은 73%이상, 탁도 처리율은 83%이상이었으며, 이들 처리율은 여재입경이 작을수록 증가하였고 모든 조건에서 방류수중의 BOD 처리율은 98%이상, COD 처리율은 91%이상, 탁도 처리율은 98%이상이었다. 여재입경별 총 질소 및 총 인 처리율은 여재입경이 작을수록 약간 증가하였고, 모든 조건에서 방류수중의 총 질소 처리율은 약 45~59%, 총 인 처리율은 약 80~96% 정도이었다. 하수 처리율 및 투수속도를 고려해 볼 때 하수처리장 호기성조의 최적입경은 2~4 mm정도 혐기성조의 최적입경은 0.1~4 mm정도가 적절한 젓으로 사료되었다. 따라서 이러한 조건을 자연정화공법을 이용한 하수처리장에 적용하면 높은 하수처리효율을 유지하면서 하수처리장의 공극폐쇄현상이 일어나지 않아 장기간 운전할 수 있을 것으로 판단된다. An investigation was carried out to evaluate the effects of pebble size on the small-scale sewage treatment apparatus by natural purification method that consisted of aerobic and anaerobic plot pH and EC in both plots varied minimally regardless of pebble size. DO in aerobic plot increased as the pebble size decreased. That in the anaerobic plot was slightly less in comparison with that of the aerobic plot, but varied minimally, 2.4~5.1 mg/L regardless of pebble size. Under all experimental conditions, removals of BOD, COD and turbidity in anaerobic plot were more than 98, 91 and respectively. Removals of T-N and T-P increased as pebble size decreased. Under all experimental conditions, removals of T-N and T-P in anaerobic plot were about 45~59 and 80~96%, respectively. Judging from the above results, it should be considered that the optimum pebble size and pebble permeability in both plot was 2~4 mm and 0.1~4 mm, respectively.
경고막적 및 고막외적 전극위치에 따른 와우전위의 비교연구
장동임,박철규,이병돈,장혁순,강주원 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.1
Electrocochleography is a method of the measurement of electrical events generated either within the cochlea or by primary afferent neurons. It includes measures of summating potential(SP) and cochlear microphonics(CM) from the cochlea, and action potential(AC) from the auditory nerve. There are severval diffefent ways to measure the potentials, mainly transtympanic and extratympanic methods. The purpose of this study is to provide a normal data of eletrocochleography in adults and compare the results obtained by extratympanic and transtympanic methods. The following results were obstained: 1. As the intensity of sound was increased, the SP amplitude and AP amplitude were increased. There was no significant difference between extratympanic and transtympanic method. 2. As the intensity of sound was increased, the SP latency and AP latency were shortened without significant difference between two different methods. 3. As the intensity of sound was increased, the SP/AP ratio was increased without difference in both methods which was less than o.30. 4. Non-invasive method of electrocohleography, the extratympanic method, can be one of the easy method an can be used widely clinically.
유도형 변위 센서의 전기 노이즈 분석과 센서 성능에 미치는 영향 고찰
신우철,홍준희,이동주 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-
Noise is a problem in many electronic circuits and active control system. Arising from spuriously coupled noise from other circuits, it corrupts the signal of interest and introduces an uncertainty into information it contains. In this paper, we have researched noise characteristics of the inductive displacement sensor which has been designed. we first present basic concept and characteristics of magnetic field-coupled noise in the sensor output signal. Then, we are present relation noise and sensor performances. Finally, we concentrate low noise design of a sensor driver and a signal detection circuit.
이철주,김성윤,김동건,유남재 江原大學校 産業技術硏究所 2009 産業技術硏究 Vol.29 No.B
This study has analysed actual overbreak, shotcrete rebound and the ratio between the actual quantity of shotcrete to designed shotcrete measured during a NATM tunnel construction. The measured shotcrete rebound was about 7.2% in average which was about half the allowable rebound (15%), showing shotcrete spraying was performed well. Based on the measurement of excavated tunnel shape, average overbreak was about 28.5 cm after tunnel excavation by drill and blasting method. This was about 260% of allowable overbreak. In addition, due to the rebound and overbreak actual amount of shotcrete used in the tunnelling work was about 116.5 % of the designed value. According to the field measurement the ratio of actual shotcrete to designed value showed some relation with standard support pattern, but the size of overbreak did not show the correlation with standard support pattern. Hence current design specifications stating the size of overbreak based entirely on standard support pattern should perhaps be reestablished. The insight into the design guideline regarding overbreak and shotcrete
고속주축 모니터링용 광파이버 변위센서의 파이버 특성에 따른 센서 성능 연구
박찬규,신우철,배완성,홍준희,이동주 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-
To make high speed spindle system work properly, sensors with outstanding resolution and dynamic characteristics are essential. An optical fiber displacement sensor is based on simple principles. Electrical signal responds to the optical flux change due to the displacement change between a target and a sensor probe. In this paper, the performance of optical fiber displacement sensor has been investigated according to properties of optical fiber. Firstly, optical loss has been measured before and after polishing optical fiber endface. Secondly, allowance of optical fiber bending has been tested. thirdly sensitivity and linear range of the sensor has been found out according to the shape of cross section of optical fiber.
고속주축 모니터링용 광파이버 변위센서의 레이저 다이오드 출력에 따른 성능평가
박찬규,신우철,홍준희,이동주 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
This paper is to develop an optical fiber displacement sensor for monitoring high speed spindle. Proper magnitude of optical power as well as amplification of output signal are necessary to improve sensitivity of the sensor. In this paper, to meet the need of improvement of the sensor resolution, we choose proper optical power and amplification level through speculating on optical power of a laser diode.
근치적 위절제술을 시행한 위암 환자에서 보조요법으로서 5-Fluorouracil, Epirubicin과 5-Epirubicil,Cisplatin의 복합화학요법의 효과 비교
최정혜,안명주,한동수,손주현,전용철,박훤겸,백홍규,이홍기,남영수 한양대학교 의과대학 2000 한양의대 학술지 Vol.20 No.2
To compare 5-fluorouracil plus epirubicin (FE) to 5-fluorouracil plus cisplatin (FP) chemotherapy as adjuvant therapy for patients with resected gastric cancer. Between August 1995 and March 2000, 46 patients with completely resected gastric cancer received six courses of FE (5-fluorouracil 1000mg/m2/day, D2-D5, epirubicin 70mg/m2, D1) or FP (5-fluorouracil 1000mg/m2/day, D2-D5, cisplatin 70mg/m2, D1) chemotherapy. The 23 patients were assigned to each treatment group. A total of 127 courses of treatment were given both FE and FP group. The FP group tended to show more risk of overall death rate. But there were no differences between FE and FP groups in terms of overall survival or disease-free survival. Both treatment arms were generally well tolerated to chemotherapy. We concluded to be no significant differences between FE and FP groups in terms of overall survival or disease-free survival. To define the efficacy of adjuvant chemotherapy for gastric adenocarcinoma, further prospective randomized trials with large number of patients should be warranted.
이치연,이동주,조이수,김승인,이지연,김은철 원광대학교 생체재료·매식연구소 1996 원광생체재료·매식 Vol.5 No.2
Dens evaginatus is a rare developmental anomaly in which an enamel-covered tubercle projects from the occlusal surface of a tooth. usually lower second premolar. When the tubercle fractures, the pulpal extension into the tubercle may be exposed, which results in early pulpal necrosis, periapical infection and even osteomyelitis. We found the dens evaginatus in 16-week-old fetal mandible. Microscopically, we observed the protrusion of dental papilla into the dental organ and hard tissue formation which will be the tubercle by serial section. This anomaly was reported to be very rare in tooth development of fetus, so we reported this finding with brief review of literatures.