향류식 역삼투공정에 의한 상용막의 에탄올 농축 특성에 관한 연구

진병복,이병철,민병렬 연세대학교 산업기술연구소 1993 논문집 Vol.25 No.2

0The concentration characteristics for reverse osmosis and countercurrent reverse osmosis process with varing concentration of ethanol solution and applied pressure were investigated in this study. Also, the theoretical value derived for countercurrent reverse osmosis(Osmotic sink reverse osmosis) were compared with the experimental results. In RO and CCRO experiments, three kinds of commercial membrane(TFCL, UOP Co., U.S.A./FT-30, Film Tec Co., U.S.A. / Cellulose Acetate blend, UOP Co., U.S.A.), applied pressure of 3.92, 4.9 MPa and feed concentration of 3.9, 10.2 wt% were used. From the results of this study. DC(Degree of Concentration) of ethanol by TFCL membrane was the highest value of three kinds of membrane, and DC of ethanol by OSRO was the highest value of two types of ethanol concentration process. In addition, DC of OSRO more increased greately than that of RO as applied pressure difference increased. In comparison with experimental and numrical results, the numerical results were accorded with experimental results within 5-13% of error.

비트겐슈타인의 대상 개념

박병철 부산 외국어 대학교 1999 外大論叢 Vol.19 No.3

There have beeb many different interpretations of Wittgenstein`s philosophy. The nature of Tractarian objects is one of the much diputed subjects in particular. One of the major reasons for the unsettled disputes is Wittgenstein`s unique philosophical style, which contains hardly any arguments. The nature of Tractarian objects, too, is interepreted in many different ways. One influential reading is initiated by Hido Ishiguro who sees the objects of the Tractatus possess no independent existence. According to this reading, names that designate objects are mere dummy names introduced for the semantical purpose. Unlike this anti-realistic interpretation, David Pears and Jaakko Hintikka have claimed that Wittgenstein`s objects are to be viewed as real entities. They both agree in that Wittgenstein puts forward a kind of logical atomism in the Tractatus. But while Pears thinks Wittgenstein`s logical atomism is different kind from Russell`s, Hintikka sees Wittgenstein develops his theory directly from Russell`s logical atomism. In support of Hintikka`s reading. I argue in this paper that Tractarian objects are variation of Russellian sense-data, i.e., the objects of immediate experience.

學校體育施設 및 用具의 現況과 規格에 關한 硏究

조연철,김병택 啓明大學校 生活科學硏究所 1999 科學論集 Vol.25 No.-

The purpose of this study was to examine the current conditions and proprieties of the facilities and instruments for physical activities in the high schools in the city of Taegu. Obtained data were compared with the school system law established in 1996, and the results of the comparison were as the following: 1) This study indicated that most schools exceed the generally-required space by 321% (the schools for boys) and by 198% (the schools for boys) in proportion to the standards in the concerned laws, which means that the schools are offering the space of 11.7㎡ and 7.0㎡ on the average for each boy student's and girl student's physical activities. But there are few schools which come up to the proper degree to which all the schools in our country must have the enough space for a student's physical activities. 2) The present percentages of the school's retaining the facilities and instruments for the students' physical activities in proportion to the required standards; ① schools for boys; common activities 123.0%, athletics 70.7%, gymnastics 46.2%, ball games 95.2%, body competitions 72.2%, life-long physical activities 73.6%, the other activities 141.0% ② schools for girls; common activities 151.2%, athletics 66.6%, gymnastics 36.0% ball games 112.3%, life-long physical activities 120.1%, dance 92.0%, the other activities 133.4% 3) The present percentages in proportion to the required standards in the concerned laws about the facilities and instruments for physical activities (in high schools for boys and for girls); hurdle 100.0%, 62.7%, shot 33.3%, 100.0%, discus 100.0%, 100.0%, badminton 100.0%, 92.0%, exercise bar 94.2%, 58.0%, balance beam 49.7%, 37.8%, mattress 79.7%, 34.2%, vaulting horse 61.9%, 25.0%, jumping post 71.4%, 13.3%, goal post for soccer 71.4%, goal post for handball 100.0%, 100.0%, height of the net for volleyball 90.0%, 87.5%, basketball ring 95.2%, 88.9%, height of the net for badminton and table for table tennis 100.0%, 100.0%, arena for traditional Korean wrestling 60.0%.

日本의 大學文化와 技術革新의 受容度 : 情報技術과 經營敎育의 變化에 대한 反應을 中心으로

許哲夫,兪炳辰 明知大學校 經濟硏究所 1993 경영연구 Vol.9 No.1

카드미움과 鉛의 同時投與가 白鼠臟器內의 含量과 酵素活性度 變化에 미치는 影響

高炳勳,車喆煥 고려대학교 의과대학 1981 고려대 의대 잡지 Vol.18 No.3

In order to study interaction of cadmium (Cd) and lead (Pb) when exposed at the same time, 1㎎/㎏ body weight of Cd and/or 1㎎/㎏ body weight of Pb were simultaneously inject into 78 adult rats of Spregue-Dswley Species intraperitonially every day for 10 to 60 days and their contents in liver, kidney and bone of the rats were measured at every 10 day-interval. The results were summarized as follows; 1. Kidney and liver which were the target organs of Cd were seemed to have been damaged since from 30th day after combined injection of Cd with Pb when maximum or critical concentration was shown, whereas it was shown from 60th day after injection of Cd only. 2. In case of Cd-Pb combined administration, concentration of Cd in bone tissue started increasing from 50th after initial administration, whereas it started from 30th day after in case of injection of Cd only. It was thought that Cd contained in liver and kidney would be transported to bone tissue after decreasement of accummulation rate in the kidney & liver. 3. The similar phenomena were also shown in case Pb accummulation showing remarkable decreasement of it after 40th day of combined injection of Cd and Pb. 4. Concentration of iron in liver of rats exposed to Cd and/or Pb became lower and lower as time went by compared with that of control group. Degree of decreasement was more severe in the group exposed to both of Cd and Pb at the same time. 5. Activity of LDH decreased from 10th day after the simultaneous injection of Cd with Pb, and it increased again at 50th day of experiment. And activity of alkaline-phosphatase started decreasing from 20th day after exposure of Cd and Pb.

2사이클 가솔린기관의 단속연소에 관한 연구

권병철 大田産業大學校 1999 한밭대학교 논문집 Vol.16 No.1

The discontinuous combustion takes place in the two cycle engine when it is subjected to the part loaded. This is because the intake concentration of scavenging gas is low. The discontinuous combustion acts as the main source for noise-vibration, green-colored gas, fume, and knock. In this study, the influences of the kind of cylinder head and the ignition position upon the discontinuous characteristics are systematically examined. The results obtained are as follows. 1. The ignition rate of hemispherical head is better than that of wedge type head and shell type head. 2. The ignition rate of wedge type head and shell type head is improved if the ignition position is changed. 3. The limits of back fire of wedge type head and shell type head are located at leaner side than the hemispherical head is.

마이크론 크기의 Poly(Ethyl Methacrylate) 분산 미립자 형성에 관한 연구

김병철,손태원,이기창 慶尙大學校生産技術硏究所 1991 生産技術硏究所論文集 Vol.7 No.-

Considerable interest has been recently generated by the preparation of large monodisperse polymer particles by dispersion polymerization. In a dispersion polymerization process, the reaction mixture starts out as a homogeneous solution and the resulting polymer precipitates as spherical particles. The present study focused on dispersion polymerization of Ethly Methacrylate in water-ethanol mixture with a Azo initiator and a polymer stabilizer, poly(vinyl pyrrolidone) with an anionic costabilizer, Aerosol MA. Effects of polymerization parameters, such as monomer concentration, initiator concentration, stabilizer concentration, different molecular weight of stabilizer, comonomer concentration, and polymerization temperature on average particle size and size distribution have been investigated. The polymerization recipe of preparation of uniform PEMA particles in 2-6 ㎛ size range has been also made.

산소분리막에 의해 상승된 산소농도가 가솔린기관의 성능에 미치는 영향

권병철 大田産業大學校 1993 한밭대학교 논문집 Vol.10 No.1

AbstractThe aim of the study is to improve the performance of the gasoline engine. Recently, the oxygen membrane enriching the oxygen in the air has been developed and used in many engineering field.The engine performance is changed by deeply saturated oxygen concentration supplied to the combustion chamber. According to the oxygen concentration of the fuel air mix- ture, the engine performance is improved as follows.It is shown that the mean effective pressure, output and thermal efficiency is increased, however, fuel consumption rate is decreased as increasing oxygen concen- tration.The oxygen concentration have great effect on the combustion at the poor limit rather than fuel excess state. The aim of the study is to improve the performance of the gasoline engine. Recently, the oxygen membrane enriching the oxygen in the air has been developed and used in many engineering field. The engine performance is changed by deeply saturated oxygen concentration supplied to the combustion chamber. According to the oxygen concentration of the fuel air mixture, the engine performance is improved as follows. It is shown that the mean effective pressure, output and thermal efficiency is increased, however, fuel consumption rate is decreased as increasing oxygen concentration. The oxygen concentration have great effect on the combustion at the poor limit rather than fuel excess state.

Pyrantel Pamoate (Combantrin)에 依한 蛔蟲 및 鉤蟲感染의 集團治療

徐丙卨,朴定圭,趙昇烈,姜信榮,魚光本,康世喆,李源宰,李正雨,黃邱一 中央醫學社 1972 中央醫學 Vol.23 No.6

The mass treatment trial of pyrantel pamoate on Ascaris lumbricoides and Ancylostoma duodenale infections was carried out to school-children and inhabitants in rural areas in the central part of Korea. Pyrantel pamoate ("Combantrin") tablet (123 mg base) was administered as a single dose of 10. 0 mg per kg. body weight to a total of 4,198 Ascaris infected cases selected out of 4,436 (41. 6%) positives, who were screened from the total 10,660 collected stool specimens. Of these, only 3,169. cases were followed up after treatment to provide an analysis in this study. Incidentally 161 cases with concomittently infected hookworm were also subjected to assess the efficacy of pyrantel pamoate against A. duodenale. The egg negative conversion rate on A. lumbricoides was 95.3%, and on A. duodenale, 97.5% four weeks following treatment. In failed cases, the egg reduction rates on both of the infections were 97.6% and 97.3% respectively. No side effects and no problem in drug administration were demonstrated. It is concluded that this study confirms the high efficacy of pyrantel pamoate in the treatment of Ascaris lumbricoides and Ancylostoma duodenale infections and also proves the acceptability and safety of this drug in the mass treatment of ascariasis in a population with relatively high worm burden.

정신분열증에서 신경증적 증상의 임상적 의의에 관한 연구

박병관,신석철,강민희,신윤오 충남대학교 의과대학 지역사회의학연구소 1990 충남의대잡지 Vol.17 No.1

To investigate the clinical significance of the neurotic symptoms in schizophrenia, the author applied PSE(Present State Examination) on Screening Schedule to 153 schizophrenic patients who were fit for the aim of this study. The patients were divided into two groups to grasp the phenomenological characteristics as the group with neurotic symptoms (100 cases) and the group without neurotic symptoms(53 cases). Among 91 items except neurotic symptoms in PSE, 14 items were selected as significant under X²-test, and tried factor analysis with 14 items using SPSS/PC+. The results of this study were summarized as follows. 1. In the group with neurotic symptoms, 4 factors were extracted as slowness of speech and behavior and blunted affect factor, inappropriate answer and affect factor, delusion factor, and restricted and poverty of speech factor. In the group without neurotic symptoms, 5 factors were extracted as slowness speech and behavior and incoherence factor, inappropriate and poverty speech and self-neglect factor, delusion factor, inappropriate affect factor, and loss of affect factor. In the group of total patients, 4 factor were extracted as restricted and slowness of speech and behavior and blunted affect factor, delusion factor, inappropriate and poverty of speech and inappropriate affect factor, and incoherence factor. 2. In the group with neurotic symptoms, slowness of speech and behavior, inappropriate answer, blunted and inappropriate affect were the major symptoms and inappropriate answer and affect, delusion, restricted and poverty of speech were the minor symptoms. Among these symptoms, slowness restriction, poverty of speech and behavior, inappropriate answer and characteristic blunted affect were characterized by negative symptoms(i.e. defect state) which were frequent in chronic schizophrenia. 3. In the group without neurotic symptoms, slowness of speech and behavior, incoherence, and self-neglect were the major symptoms and inappropriate and poverty of speech, delusion, inappropriate and loss of affect were the minor symptoms. Among these symptoms, slowness and inappropriateness of speech and behavior, and characteristic incoherence and self-neglect were characterized by positive symptoms which were interpreted as less distorted reality than the group with neurotic symptoms in the process of schzophrenia. 4. In the group of total patients, restricted and slowness of speech and behavior, blunted affect and delusion were the major symptoms and inappropriateness, poverty and incoherence of speech, and inappropriate affect were the minor symptoms, which were composed of the major and the minor symptoms of the group with neurotic symptoms and without neurotic symptoms. These symptoms can be seen frequently in the diagnostic criterias and clinical practice and thought to be the result of the major symptoms common in schizophrenia regardless of he presence of neurotic symptoms.