플라즈마 표지소자의 제작

이상윤,라병욱,박동수,황인헌,이덕동,신영남,박성배,이동욱,박용석,박형근,손상호,권태근,채경락,정경득 慶北大學校 自然科學大學 1986 自然科學論文集 Vol.4 No.-

An Ac-type Plasma Display Panel (PDP) operating with Ne-Ar(0.1%) Penning mixture gas is fabicated. The characterics of the panel with electrodes covered with thin and thick dielectric layers are studied. The brightness of the Neon-orange light emitted by the panel measured as function of applied voltage and frequency. As an application, a graphic display system equipped with PDP showing still and moving pictures is made.

연직배수공법의 교란효과의 배수저항에 관한 고찰

박용원,김병일,류태하 明知大學校 産業技術硏究所 1995 産業技術硏究所論文集 Vol.14 No.-

Vertica1 drain method is being used as effective ground improving technique for soft clay layer with small shear strength and high compressibility. Theoretically, consolidation time of ground can be decreased by decreasing drainage path and increasing well diameter. In reality, however, smear effect due to the drain installation and the well resistance cause consolidation time delay. In this study, we have studied on the inf1uence of the smear effect and the well resistance of vertical drain on the consolidation time. Theories of Barron, Hansbo, Onoue are used in the estimation of the consolidation time and compare the results changing weak layer thickness, diameter ratio of smear zone, coefficient ratio of consolidation with respect to sand drain, paper drain, pack drain, and SCP. In this paper we found that the well resistance has great influence on increasing the consolidation time in paper and pack drain. And sand drain and SCP, the smear effect has great influence on increasing the consolidation time and well resistance effect is negligible.

진주시 대기산성 강하 물질의 침착 특성

박정호,김병용 진주산업대학교 농업기술연구소 2001 農業技術硏究所報 Vol.14 No.-

In this study, monthly variations of the acid deposition for air pollutants were analysed. Acid deposition was collected by total (soluble + insoluble fraction) deposition sampler in Chinju area from April to September 2000, and the concentrations of dissolved ionic components (F^-, Cl^-, NO_3^-, SO_4^2-, Na^+, K^+, Ca^2+, NH_4^4, Mg^2+), pH and E.C. in the soluble deposition fraction were determined. Most soluble deposition showed acid character (pH < 5.6), and only 29% had a pH higher than 5.6. And the mean pH values at A∼B site were in the range of 4.0∼5.3. The sum deposition of all anion and cation species were in order of A>B>D>C site, and mean SO_4^2- deposition was 4.96∼21.84 mg/㎡·day.

하양읍을 관류하는 소하천들의 수질에 관한 연구

박병윤,이부용 대구효성가톨릭대학교 응용과학연구소 1997 응용과학연구논문집 Vol.5 No.-

하양읍을 관류하여 금 호강으로 유입되는 소하천들과 하양읍의 남쪽 외곽을 흐르는 금호강을 대상으로 10개 지점을 선정하여 시기별로p 인(PO_4-P), 화학적산소요구량(COD), 경도(hardness) 및 Cl 이온을 조사한 결과는 다음과같았다. 1) 월별 pH값의 변동범위는 1월에는 7.3~82. 2월에는 7.O~8.2, 3월에는 6.9~ 8.9, 4월에는 7.5~9.3, 5월에는 6.3~7.9이었다. 3월부터 하천수의 pH는 상승하기 시작하여 4월 하천수의 경우에는 pH가 가장 높았다. 그러나 수온이 매우상승하는 5월 하천수의 pH는 가장 낮게 나타났다. 2) 월별 경도의 변동범위는 1월에는 14~71mg/l, 2월에는 14~70mg/l, 3월에는 13~66mg/l, 4월에는 11~55mg/l, 5월에는 16~100mg/l 이었다. 전체적으로 경도는 하천 하류지점으로 갈수록 증가 하였으며, 그리고 하양읍을 관류하는 소하천의 경우 5월 하천수의 경도가 보다 높았다. 3) 월별 인(PO_4-P)의 함량은 1월에는 0.55~l.10mg/l, 2월에는 0.80~1.38mg/l, 3월에는 0.40~0.70mg/ㅣ, 4월에는 0.25~0.50mg/ㅣ, 5월에는 0.35~1.06mg/ㅣ 이었다. 지점별로는 하양시 장지역 의 생활하수가 직접유입되는 S6(Hajubridge Ⅱ)지점에서 특히 인의 함량이 높았다. 이는 타 주거지역 보다 시장지역에서 오염물질의 배출량이 많기 때문으로 사료된다. 4) 월별 COD값은 1월에는 특히 높은 S6(Haju bridge Ⅱ)지점의 19.5mg/l를 제외하면1.O~ 6.5mg/l, 2월에는 22.O~27.5mg/l, 3월에는 21.5~24.8mg/l, 4월에는 21.5~27.Omg/ l, 5월에는 23.5~39.Omg/l이었다. 그리고S6(Haju bridge Ⅱ)지점에서의 COD값은 타지점보다 높은데, 이는 인 함량의 비교에서 나타난 것과 같다. 5) 월별 Cl이온의 양은 1월에는 12.O~46.5mg/l, 2월에는 15.0~46.Omg/l & 3월에는 11.5~36.Omg/l, 4월에는 11.5~75.Omg/l, 5 월에는 16.O~95.Omg/l이었다. 지점별로는S6(Haju bridgeⅡ)지점에서의 Cl이온의 양이 타 지점보다 높은데, 특히 5월 하천수의 Cl이온의 양이 크게 높았다. This study was conducted to provide the basic information for the effective purification of town streams in Hayang-up and the conservation of Keumho river. Periodically, pH, hardness, phosphate(PO_4-P), COD and Cl anion of water were investigated at ten sampling sites. The results were as follows. 1) The range of pH values, which were measured in January, February, March, April and May, were 7.3∼8.2, 7.0∼8.2, 6.9∼8.9, 7.5∼9.3 and 6.3∼7.9 respectively. 2) The ranges of hardness values, which were measured in January, February, March, April and May, were 14∼71mg/ℓ, 14∼70mg/ℓ, 13∼66mg/ℓ, 11∼55mg/ℓ and 16∼100mg/ℓ respectively. 3) The ranges of phosphate values, which were measured in January, February, March, April and May, were 0.55∼1.10mg/ℓ, 0.80∼1.38mg/ℓ, 0.40∼0.70mg/ℓ, 0.25∼0.50mg/ℓ and 0.35∼1.06mg/ℓ respectively. 4) The ranges of COD values, which were measured in January, February, March, April and May, were 1.0∼19.5mg/ℓ, 22.0∼27.5mg/ℓ, 21.5∼24.8mg/ℓ, 21.5∼27.0mg/ℓ and 23.5∼39.0mg/ℓ respectively. Especially, the COD values measured for five months at Haju bridge Ⅱ(market area) were at range of 19.5(Jan.)∼39.0(May)mg/ℓ, these values were very high in comparison with those measured at other nine sampling sites. 5) The ranges of Cl anion values, which measured respectively in January, February, March, April and May, were 12.0∼46.5mg/ℓ, 15.0∼46.0mg/ℓ, 11.5∼36.0mg/ℓ, 11.5∼75.0mg/ℓ, and 16.0∼95.0mg/ℓ. The Cl anion values measured at Haju bridge Ⅱ(market area) were also much higher than those measured at other sites.

채소류에 의한 카드뮴과 납의 흡수에 관한 연구

박병윤,이부용,양소영,강상재,이동훈 대구효성가톨릭대학교 응용과학연구소 1997 응용과학연구논문집 Vol.6 No.1

본 연구에서는 전통적으로 우리 식탁의 주요 부식으로 이용되어온 콩나물과 미나리를 Cd와 Pb가 함유된 배양액으로 재배하는 동안 이들 채소에 Cd와 Pb 가 어느 정도 흡수되는가를 조사하였다. 또한 수경재배에서 Cd와 Pb에 의한 콩나물의 생육장해 정도를 조사하였다. 배양액속에 함유된 Pb이온은 재배기간 동안 미나리와 콩나물 체내로 쉽게 흡 수되었다. 그리고 미나리는 콩나물보다 더 많은 양의 Pb를 흡수하였는데, 이 는 미나리의 줄기에 다량의 뿌리가 붙어있기 때문인 것으로 생각된다. 또한 배양액속의 Pb의 농도와 미나리와 콩나물 체내에 축적된 Pb의 함량과는 높은 상관성을 나타내었는데, 각각의 상관계수(r^2)는 0.9411, 0.9828이었다. Cd역시 Pb와 마찬가지로 재배기간 동안 미나리와 콩나물 체내로 쉽게 흡수되 었다. 또한 배양액속의 Cd의 농도와 미나리와 콩나물 체내에 축적된 Cd의 함 량과는 높은 상관성을 나타내었는데, 각각의 상관계수(r^2)은 0.9900, 0.9054이었다. 그러나 두 식물체에서 Pb의 흡수 경우와는 달리 배양액속에 함유되어 있는 Cd의 농도가 높을 경우 콩나물이 미나리보다 더 많은 Cd을 흡수하였다. 콩나물의 경우에는 Cd과 Pb이 재배기간 동안 거의 비슷한 양으로 흡수되었으며, 그리고 배양액 속에 함유된 이들 중금속들과 콩나물 체내에 축적된 중금속들 사이의 직선회귀선의 기울기도 거의 유사하였다. 그러나 미나리의 경우에는 Pb이 Cd보다 상당히 많은 양이 흡수되었으며, 또한 직선회귀선의 기울기도 Cd보다 Pb의 경우 상당히 크게 나타났다. Cd와 Pb의 농도가 1mg/l일 경우에는 콩나물 길이의 성장 또는 외관상의 생육에 거의 영향이 없었다. 그러나 10mg/l 농도에서부터는 길이의 성장장해뿐만 아니라 외관상으로도 분명한 장해현상이 나타났다. 50mg/l와 100mg/l의 농도에서는 콩나물의 생육장해가 더욱 심해졌다. Pb의 경우에는 100mg/l의 농도에서, Cd의 경우에는 50mg/l의 농도에서부터 재배기간 동안 콩나물의 상당 부분이 썩는 현상이 나타났다. This study was conducted to investigate the uptake of Cd and Pb by vegetables. Bean sprout and dropwort, which are very important for traditional korean dishes, were cultivated in culture fluid added with Cd and Pb cations, and the content of Cd and Pb absorbed by these vegetables were measured. Pb cations in culture fluid were easily absorbed into bean sprout and dropwort. And dropwort absorbed Pb more than bean sprout did. Pb contents of bean sprout and dropwart dramatically increased with increasing Pb concentration in culture fluid. The correlation coefficients(r^2) between Pb contents in dropwort and bean sprout and Pb concentrations in culture fluid were 0.9411 and 0.9828, respectively. Cd cations were also easily absorbed into bean sprout and dropwort. The correlation coefficients(r^2) between Cd contents in dropwort and bean sprout and Cd concentrations in culture fluid were 0.9900 and 0.9054, respectively. The growth of bean sprout was not hindered at the concentration of 1mg/ℓ Cd and Pb in culture fluid. But high Cd and Pb concentrations hindeded remarkably the growth of this vegetable. A large part of bean sprout was rotten at the concentrations of 50 mg/ℓ Cd, and 100 mg/ℓ Pb.

하천수중 화학적산소요구량 및 유기성탄소의 경시적 변화에 관한 연구

박병윤,양소영,이부용,장상문 대구효성가톨릭대학교 1998 연구논문집 Vol.57 No.2

In order to provide the basic information for the water quality of urban streams and the quality variation of these streams, the water pollution indicators of Sin stream and Keumho river flowing through Taegu city were measured, and the variations of COD and OC of stream waters and artifical samples were studied under the condition of stagnation. For this experiment, two sampling sites(Sungpook bridge, Mutae bridge) were selected. Sungpook bridge is located most down the Sin stream, Mutae bridge is located on the lower keumho river. Artificial samples were prepared with mixing starch and CaCl?, and the pHs of these samples were adjusted by adding NaOH and HCl. The results were as follows. 1. The DO values of stream waters sampled in June and July were much lower than those of stream waters sampled in March and April. 2. The COD values of all the samples highly exceeded the fifth grade of environmental criterion(10mg/?) 3. EC highly correlated with ALK and Cl anion. 4. The COD values of stream waters sampled in June and July and stagnated under the laboratory temperature distinctly decreased in process of stagnation, and those of stream waters sampled in April and stagnated in the incubator(20℃) also distinctly decreased. But, the COD variations of stream waters sampled in March and April and stgnated under the laboratory temperature didn't show a distinct tendency. 5. The contents of OC in stream waters sampled in March and April and stagnated under the laboratory temperature distinctly decreased in process of stagnation, and those of stream waters sampled in April and stagnated in the incubator(20℃) also distinctly decreased. But, the contents of OC in stream waters stagnated under the incubator temperature, which was higher than the laboratory temperature, more rapidly decreased in process of stagnation.

여성 하부요관석환자에서 무마취하 요관경하 배석술

박영호,송윤섭,임용순,김영호,이남규,구자현,서병욱,김민의,전윤수 순천향의학연구소 1999 Journal of Soonchunhyang Medical Science Vol.5 No.2

Although ureteroscopy(URS) has been used widely to remove ureteral calculi, there is an argument against the belief that anesthesia or admission is needed for URS. We evaluated the experience of URS without anesthesia in female patients. From September 1997 to July 1998, URS was performed in 31 female patients without anesthesia. EHL(Electrohydraulic Lithotripsy) was used in 21 patients with impacted or large stone over 5mm. All patients were given oral antibiotics for 3 days and follow-up KUB was taken to confirm successful removal of the stone one week after the procedure. Successful treatment was defined as complete removal of the stone or residual fragments less than 2mm. Overall success rate was 96.7%(30 cases among 31 cases). All but one patient tolerated with analgesia through the entire procedures. There were only minimal complications such as mild flank pain and hematuria. So, we recommend that non-anesthetic ureteroscopic removal of stone as the first choice for treatment of lower ureteral stones in female based on the minimal morbidity, high success rate and low cost.

알코올리즘 선별검사 도구들의 진단 효율 비교

박병강,이동배,이태용,조영채,권윤형 충남대학교 의과대학 지역사회의학연구소 2000 충남의대잡지 Vol.27 No.1

To compare the clinical usefulness of four alcoholism-screening tests frequently used in Korea such as MAST, NAST, AUDIT, CAST, 96 drinking males were given diagnostic interview based on DSM-IV criteria and scores from four tests were obtained and analyzed. Of 96 subjects, 52.1% were normal without drinking problems, 38.5% with alcohol abuse and 9.4% with alcohol dependence. In terms of reliability of items in screening tests, four items in MAST were not found to have statistically significant item-total correlation. The appropriate cut-off value for screening tests to detect alcohol use disorders were above 15 points in AUDIT, above 5 points in MAST, above one item in NAST and above 2 items in CAGE. In terms of sensitivity for detection of alcohol use disorders, NAST was highest with 93.5%, and specificity, CAGE was highest with 90.0%. Considering the lowest sensitivity of 76.0% in CAGE and 76.J% of specificity in MAST, AUDIT and NAST were the most appropriate in screening alcohol abuse. The appropriate standard values for screening alcohol dependence were above 26 pants in AUDIT, above 13 points in MAST, above 5 items in NAST, and above 3 items in CAGE. In screening alcohol dependence AUDIT had the highest sensitivity of 100.0%, and both AUDIT and NAST had the highest specificity of 94.3%, respectively. The sensitivity of three screening tools except AUDIT were the same with the value of 88.9% and therefore AUDIT were the most appropriate in detecting alcohol dependence taking into consideration the relatively low specificity of 85.1% in CAGE.

패각 폐자원을 활용한 악취제거기능을 갖는 폴리에틸렌 필름

전병철,정용찬,정미화,박정환,권오철 수원대학교 기능성생명소재연구소 2003 자연과학연구논문집 Vol.2 No.1

연간 250,000 톤 정도 생산되는 패각을 이용하여 악취제거기능을 갖는 폴리에틸렌 필름을 제조하기 위해, 패각 표면의 탄산이온을 바탕으로 양이온 또는 양이온성 계면활성제의 이온교환에 의한 표면흡착 및 이에 따른 표면 극성 변화를 통해서 악취제거능을 부여하였다. 패각 표면의 개질은 양이온성 계면활성제로서 DTAB (n-dodecyltrimethylammonium bromide), CTAB (n-cetyltrimethylammonium bromide), 그리고 DHAB(n-dihexadecyldimethylammonium bromide)를 사용하였다. 또한 양이온의 금속으로는 Ce3+, Mg2+, Al3+를 이용하여 계면활성제의 이온교환방법으로 표면을 개 질하였다. 표면개질된 패각 분말을 이용하여 LDPE와 패각 기준 20 wt%의 마스터 배치 (masterbatch, MB)를 제조한 후 다시 LDPE와 섞어서 패각 기준 3, 5, 10 wt%의 폴리에틸렌필름을 제조하였다. 생산된 필름의 규격은 폭 40 cm, 두께 40 μm 이었다. 제조된 패각 필름에 대한 기계적 물성 측정 결과 패각의 첨가로 인한 기계적 물성의 큰 저하는 관찰되지 않았으며, 순수 폴리에틸렌 필름 대비 80 % 이상의 물성을 유지하였다. 악취제거능은 양이온성 계면 활성제로 개질된 패각 필름이 시험된 모든 종류의 악취에 대하여 가장 우수한 악취 흡착 제거능을 보여주었으며, 개질되지 않은 패각 필름도 비교적 우수한 악취제거능을 보여주었다.

Fe-31% Ni-0.2%C 합금의 Ausformed Martensite와 Marformed Martensited의 Reversed Austenite에 관한 연구

金炳日,朴容範 순천대학교 공업기술연구소 1987 工業技術硏究所論文集 Vol.1 No.-

In this study, the ausformed martensite and marformed martensite obtained from austenite with various deformation degrees in Fe­31%Ni­0.2%C alloy were transformed to reversed austenite at 510℃ by cyclic reverse martensitic transformation. The effect of prior deformation, the rapid heating rate of reversion and number of cyclic transformation on the microstructure, mechanical properties of reversed austenite were investigated. The reverse austenitic transformation is accomplished by the mechanism of shear type transformation. The strength of reversed austenite is higher than that of original austenite without prior deformation. This is considered to be due to the higher dislocation density and grain size refinement. The structure of reversed austenite formed from ausformed martensite and marformed martensite with high deformation degrees is a fine structure of nearly equiaxed grain containing a high density of dislocation tangles and is largely affected by the prior deformation applied before reversal transformation. The strength of reversed austenite is more increased with the number of cyclic transformation especially it is strengthened at the first cyclic transformation. The yield strength of reversed austenite of ausformed martensite is lower than that of marformed martenite.