[논문]Operational Characteristics of CO2 Laser Adopted by Superposing-Discharge

Hee-Je Kim,Hyun-Ju Chung,Byoung-Dae Min,Jong-Han Joung,Sung- lun Park 釜山大學校生産技術硏究所 2003 生産技術硏究所論文集 Vol.62 No.-

오늘날 현저한 CO2 레이저의 응용 추세에 발맞추어 보다 다양한 형태의 출력 제어 기술이 대두되고 있다. 본연구에서는multi-Pulse Superposing-Discharge 기술을 이용하여 다양한형태의 CO2 레이저의 펄스를 성형 하였다. 펄스 성형을 위한 방법으로 PIC one-chip microprocessor를 이용하여 삼중 PFN 모률의 SCR을 각각 고유의 지연시간을 가지도록 제어하였다. 실험에 사용된 삼중 PFN 모률의 전원 회로는 각각 캐패시터 인덕터,SCR,고압 펄스 트랜스 그리고 고압 트랜스 2차측에 브릿지 정류기로 구성 하였다. 고압 펼스 트랜스의 1차측을 제어하므로서 PFN 모률의 동작을 저 전압에서 수행 할 수 있다. 트랜스의 2차측에 연결된 전파 정류기는 펄스 에너지를 부하에 지속적으로 전달한다. 본 연구에서는 삼중 PFN 모률의 각각의 SCR을 다른 시간 가격을 두고 트리거 하므로서 다양한 Long pulse shaping을 실현하였다. 또한 약 250-1000μs 의 주기를 가지는 다양한 펄스형 레이저 빔을 얻었다.

창작 노래시와 구비문학 : -슬라브 신화의 세계관과 도시노래의 전통을 중심으로

박현정 대구대학교 인문과학연구소 2008 人文科學硏究 Vol.31 No.-

Настоящая диссертация посвящена о фольклорской характере авторской песны. Авторская песня сформировалась именно в годы так называемойоттепели и отчетливо противо поставяла себя песням другого типа. Авторская песня возникла как альтернатива советской массовой песне-жанру тоталитарного искусства, создававшейся композиторами, поэтами и певцами. Авторская песня, поэтому недаром ряд исследователей называет её современным городским фольклором, фольклором городской интеллигенции. У каждого творца своё представление о фольклоре и каждый по-своему обнаруживает свою причастность к народной традиции. Сами барды признавались во влиянии фольклора на своё творчество. В песенном фольклоре символ иносказательно, условно замещал собой наименования жизненых явлений, понятий, предметов и т.п. Авторская песня-детище города, и она не могла не вобрать в себя то, что условно называется городским фольклором. Вплоть до ХХ в. Россия считалась крестьянской страной-отсюда и созданный веками мощный пласт глубинно-деревенского фольклорного искусства. Но с развитием и ростом городов все более заметной становилась звучащая атмосфера города, и прежде всего-музыка городского быта. Потребность городского люда в лирическом выражении своих чувств нашла выход в так называемой уличной песне. А в 50-60-е гг. возникла мода на уголовные сюжеты. Последние ещё назывались тюремные, лагерными, блатными. В 60-е гг., в так называемые застойные времена, русский язык был перенасыщен штампами, жёсткой идеологизированностью, а письменная форма речи часто подменяла речь устную, мир же тюрем и лагерей, активная уголовная субкультура были запрещёнными темами. Крылатые слова авторской песни разлетелись по всему русскоязычному миру и обрели новое самостоятельное существование.

염해손상을 입은 철근콘크리트 구조물의 내구성 증진을 위한 하부대단면 보강공법

박길현,박종환,양승현 朝鮮大學校 建設技術硏究所 2007 建設技術硏究 Vol.27 No.1

This paper deals with the strengthening method for the Increase durability of the reinforced concrete structures with Chloride Damage, and the purpose of this research is to develop the construction method and materials for extending the lower cross-section of the structures which is set up on the sea. Accordingly, a reinforced concrete pier, which has serious damage at the lower cross-section, is adopted as the subject structure for the study. In the cases of repairing or extending the lower cross-section for the structural reinforcement like the matter in this study, the most important component of choosing an method is the adhesion between the boundary sides of the existing and new concrete, and as the operation is taken on the sea, the material and method, which suit to the ocean surroundings and operating condition, should be chosen. The structural properties and operation condition taken into consideration, the material, which causes far less pollutant and have much better adhesion and strength, is developed, and with this material, this study indicates the best strengthening method to minimize the amount of rebound and to prevent the joints from breaking out. The lower cross-section extension work of the subject is executed with the newly-developed material and the method for strengthening, and as a result of the quality inspection, the material and method prove their superiority since the compression, ultimate and adhesion strength of the concrete was huge, and the adhesion between the glass fiber and the section extended is great. As the material and the strengthening method developed in this study bring about little possibilities of polluting the ocean, make it easy to operate on the sea, and have great adhesion not only between the existing and new concrete but also among each mortar layers, they are considered to be very suit to strengthening and extension of the reinforced concrete structure set up on the sea.

154kV용 활선 안전 경보기 개발에 관한 연구

정민규,조현광,우종수,안창회,서영석,김응태,박창기,오세득 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.1

In this report we developed a high voltage alarm for the safety of workers who check and repair the 154kV power line. This high voltage alarm we developed is attached on workers' helmet and alarms automatically in order to let workers know when workers work over the safety distance near 154kV power line. Until now the exact safety distance hasn't been regulated and high voltage alarm we've been using was for the range of 6∼22.9kV power line. We fabricated this high voltage alarm on the basis of electric density and actual measurement of power line. The experimental result was that high voltage alarm at 66kV power line alarmed near 90cm, at 154kV power line alarmed near 160cm from the line. Accordingly, we developed the new high voltage alarm which is operated in the range of 66∼154kV power line.

교사의 간장질환 유병률 및 질환발생의 위험요인에 관한 연구

박현주,김화중 韓國學校保健學會 2001 韓國學校保健學會誌 Vol.14 No.2

This study examined the health conditions of schoolteachers in terms of the prevalence rate and risk factors for liver disease. A cohort design was conducted for 21,319 teachers who were born from 1953 to 1957. The cohort was constructed for teachers who had no disease history such as liver disease, hypertension, cerebral vascular disease, heart disease, diabetes mellitus and cancer, and had 'normal' results from liver disease examinations in 1998. They were followed up from 1998 to 2000. SAS 6.12 was used for the data analysis. The results were as follows; (1) Prevalence rates of liver disease per 1,000 people in 1998 were 43.0. (2) The 2-year cumulative incidence of liver disease was 433/16,103(26.9/1000 persons). (3) Factors such as sex, age, school type(private or public), drinking, smoking, exercise, BMI, weight gain, fasting-blood sugar levels and total cholesterol levels were statistically significant. The significant risk factors of liver disease be identified from the multiple logistic regression analysis were age, sex(male), drinking, smoking, BMI, weight gain, fasting-blood sugar levels, and total cholesterol levels.

배관내에서 난류 마찰 저항감소에 관한 연구

박설현,윤정환,서동표,정대훈,오율권 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.1

Polymer drag reduction can offer a attractive way to utilize ready-made facilities in crude-oil transport system without additional large expenditure. Also, drag reduction in two phase flow can be applied to phase change system such as chemical reactor, pool and pump impeller which occurs cavitation. But the research on drag reduction in two phase flow has not been investigated. Therefore, experimental investigations have been carried out to analyze the drag reduction in the single phase and two phase flow. The objectives of the proposed investigation are primarily to identify and develop high performance polymer additives for fluid transportation. And drag reduction will be evaluated in horizontal flow by measuring void fraction, pressure drop, mean liquid velocity and turbulent intensity

관개수질을 고려한 시비가 벼의 생산성과 농업환경에 미치는 영향

엄미정,박현철,김갑철,류정,최정식 한국환경농학회 2004 한국환경농학회지 Vol.23 No.1

관개수 수질을 고려한 감비가 벼의 생산성과 농업환경에 미치는 영향을 분석한 결과는 다음 과 같다. 시험에 사용된 관개수의 질소, 인, 칼륨의 평균함량은 각각 6.16, 0.26, 9.37 ㎎/L 이 었고, 유입된 영양염류가 논을 통과하면서 농도가 감소되어 유출수의 성분은 유입된 관개수 보다는 낮은 농도를 보였으며, 논 표면수와 침출수의 농도는 시비량과 시비시기에 따라 변 화하였다. 토양검정 50% 시비구에서는 질소의 공급량과 소비량간의 차이가 0.14㎏/ha으로 나타나 양분수지면에서 균형을 이룬 반면, 농가관행시비구에서는 그 차이가 95.3㎏/ha로 나 타났다. 농가관행시비구에 비해 토양검정시비구와 토양검정50% 시비구는 등숙률, 천립중, 도정특성, 등이 우수하여 완전미수량에서 큰 차이를 보이지 않았으며, 시비량이 적을수록 단 백질 함량이 또한 적어 기계적인 식미치가 높게 나타나 품질에서 우수하였다. 시비효율에서 는 토양검정50% 처리에서 시비된 성분이 수량에 기여하는 비율이 높아서 시비이용과 효율 면에서 우수한 결과를 보였다. 이상과 같이, 관개수에 포함된 영양물질을 작물의 생육에 이 용함으로서, 농업용수의 수자원 이용효율을 높이는 동시에, 비료 절감효과와 생산량 증대의 가능성을 검토할 수 있었다. Table 11.Physicochemical properities and paratability of milled rice in the different fertilization ▷표삽입◁ (원문을 참조하세요) This study was conducted to investigate the effect on agricultural environment and crop productivity by different amount of applied fertilizer in consideration of irrigation water quality. N, P and K contents of irrigation water used in this eqdment were 6.16, 0.26 and 9.37 ㎎/L, reqecthly. N, P and K Concentrations of runoff water were lower than those of inflow water during rice cultivation. N, P and K Concentrations of ponded and percolated water were changed according to the amount and time of applied fertilization. During rice cultivation in paddy soil, nitrogen balance was closed to 0 in STF 50% (50% level of sail testing fertilizaton), 0.14 ㎏/ha, but it was 95.3 ㎏/ha in CF (conventional fertilization) treatment in STF 50% and STF (sail testing fertilization) treatment, yield of perfect rice was not greatly different as compared with CF treatment, due to the superiority of ripening rate, 1,000 grains weight and milling characteristics. Mechanical paratability of rice was excellent in NF (non fertilization) treatment, STF 50% treatment showed higher in nutrient availabiilty and fertilizers use efficiency than other treatments.

뇌 자기공명영상상 뇌량 병변의 호전을 보인 Marchiafava-Bignami병 1예

정재훈,성기범,안무영,신현길,박형국 대한신경과학회 1999 대한신경과학회지 Vol.17 No.5

烏梅(Mume Fructus)水性엑스의 家兎 腸運動에 미치는 影響

高錫太,朴炫貞,任光楠 조선대학교 약학연구소 1994 藥學硏究誌 Vol.16 No.1

Effect of .Mume Fructus on intestinal function was investigated in rabbit, making use of its water extract. Mume Fructus water extract(MWE), of small doses(0.1, 0.3㎎/ml) produced contractile action but did not effect the spontaneous movement strips of high dose(1.0㎎/ml) elicited relaxative action and the inhibition of spontaneous movement in ileum strips. In lieum strips, MWE did not influence the contractile action but augmented the spontaneous movement to acetylcholine, MWE elicited the inhibition of contractile action and the agumentation of spontaneous movement to pilocarpine, MWE inhibited the both actions to histamine, did not affect to serotonin and blocked to dopamine. MWE exhibited the relaxation and the inhibition of spontaneous movement in longitadinal muscle of colon. In longitudinal muscle of colon, MWE inhibited both actions to acetylcholine, did not influence the contractile actions but augmented the spontaneous movement to histamine and serotonin. MWE elicited the increase of contractile actions and the decrease of spontaneous movement in circular muscle of colon. In circular muscle of colon, MWE augmented both actions to acetylcholine, inhibited both actions to serotonin, and then did not affect the contractile action but augmented the spontaneous movement to histamine.

복식호흡이 조기진통 임부의 불안과 자궁수축 빈도에 미치는 효과

장순복,박현정,배춘희,심정언 병원간호사회 2007 임상간호연구 Vol.13 No.3

Purpose: This pilot study was aimed to examine the effect of abdominal breathing on the frequency of uterine contraction and anxiety of pregnant women with preterm labor. This study utilized pre-experimental design and nonequivalent control group pre-post test quasi-experimental design. Method: Subjects were 35 women in total; 5 in experimental group and 30 in control group. Following the protocol by Shim Joung-Ohn(2005), pregnant women who were admitted to the hospital for preterm labor were assigned to the experimental group. They were instructed to perform abdominal breathing 25 times at the start of uterine contraction, which took 5 minutes. Three sets of 5-minutes abdominal breathing(25 times) were performed daily for three days. Before and after the abdominal breathing of the experimental group, Visual Analogue Scale was employed in order to assess the psychological anxiety level of the experimental group. Blood pressure, pulse, and skin temperature were measured to obtain data on the physical anxiety level. Frequencies of uterine contraction were collected using tocodynamometer. For the women in the control group, nursing and medical records were reviewed. The collected data were analyzed using the SPSS program. Results: After abdominal breathing, there was a statistically significant decline in the psychological anxiety level of the experimental group(t=3.11, p=.01). With regard to the physical anxiety level, no statistically significant drop was detected in blood pressure and pulse, skin temperature rose significantly(t=-5.98, p=.00). There was no statistically significant reduction in the frequency of uterine contraction(t=1.94, p=.06). Conclusion: The findings of the study confirmed that abdominal breathing reduced the psychological anxiety of pregnant women with preterm labor and raised their skin temperature, one of the indicators of relaxation response. Besides, the frequency of uterine contraction tended to decrease, although the degree of the decrease was not statistically significant. This suggests that abdominal breathing has a positive effect on uterine muscle relaxation.