분사법에 의한 탄산칼슘 제조

신보철,한상오,김주호,송지훈,송근호,이광래 강원대학교 석재복합신소재제품연구센터 2001 석재연 논문집 Vol.6 No.-

본 연구는 탄산가스화법에 의한 탄산칼슘 입자 제조 공정에 있어서, 탄산가스로 채워진 반응기에 수산화칼슘 슬러리를 분사하는 방법으로 탄산칼슘 입자를 제조하였다. 수산화 칼슘의 농도(0.25~1.0wt%), 분사압력(0.5kgf /㎠~1.5kgf /㎠) 및 반응기 온도(20℃, 28℃)의 변화에 따른 생성된 탄산칼슘을 관찰하였다. 수산화 칼슘의 농도가 비교적 높으면(0.75wt%, 1.0wt%), 생성물의 pH와 전도도는 높게 나타났다. 분사압력에 의한 탄산칼슘 제조의 변화는 분사압력이 높아질수록(1.5kgf /㎠), pH와 전도도는 높게 측정되었다. 그러나, 수산화 칼슘의 농도와 분사압력의 변화가 탄산칼슘의 입자크기, 형태, 결정구조에 영향을 미치지는 않았다. 반응기의 온도가 28℃에서 생성된 탄산칼슘은 1.0㎛이하의 칼사이트 상 입자가 제조되었으며, 20℃에서 생성된 탄산칼슘은 0.5㎛이하의 칼사이트 상 입자가 제조되었다. 반응기의 온도가 낮아질수록 탄산칼슘 입자의 크기가 작아짐을 알 수 있었다. For the preparation of calcium carbonate particles from aqueous Ca(OH)2 slurry, carbonation reaction of aqueous Ca(OH)2 slurry was carried out by spouting the aqueous slurry of Ca(OH)2 into reactor filled with CO2 gas. The concentration of Ca(OH)2 varies from 0.25wt% to 1.0wt%, nozzle pressure from 0.5kgf /㎠ to 1.5kgf /㎠, and reactor temperature were set at 20℃ and 28℃. With relatively high concentration of 0.75wt% and 1.0wt% of Ca(OH)2, pH and conductivity of product-stream were observed high value. High pH and conductivity were observed at high nozzle pressure of 1.5kgf /㎠. The concentration of Ca(OH)2 and nozzle pressure, however, did not change the particle size and shape of calcium carbonate synthesized by carbonation reaction. The reaction temperature affected particle size. At reactor temperatures of 28℃ and 20℃, the particle sizes were about 1.0㎛ and 0.5㎛, respectively. Crystal structure of calcium calcium carbonate was of calcite. When reactor temperature was lower, the size of calcium carbonate particle was smaller.

소요동력 절감을 위한 트랙터용 로타리 커버의 개발

오종진,김기대,이현동,김찬수,김성환,나건영 충남대학교 농업과학연구소 2002 농업과학연구 Vol.29 No.2

본 연구에서는 로타리 경운작업시 흙 부착이 가장 많이 되고 소요동력에 큰 영향을 미치는 로타리 커버 내측에 흙이 부착되는 것을 방지하여 경운 소요동력의 절감에 기여할 수 있는 로타리 커버를 개발하는데 목적이 있으며, 그 구체적인 연구결과는 다음과 같다. 1. 본 연구의 수행을 위하여 트랙터의 로타리 경운소요동력을 측정하고자 트랙터 PTO축과 로타리 동력 입력축을 연결하는 PTO 동력 전달축을 이용하여 로타리 경운 소요동력 측정장치를 설계, 제작하였다. 2. 로타리에 장착한 흙부착 방지장치의 재질로는 스테인리스 스틸, 고무, PE 등을 사용하였다. 흙부착 방지장치 장착 로타리를 이용하여 로타리 경운시험을 통한 경운 소요동력을 측정한 결과 평균 일반 로타리는 52.18ps, 스테인리스 스틸재질 장착 로타리는 52.44ps, 고무재질 장착 로타리는 49.01ps, 그리고 PE재질 장착 로타리는 46.34ps의 소요동력을 나타냈다. 3. 흙부착 방지장치 장착 로타리를 이용하여 로타리 경운시험 후 부착된 흙의 양을 조사한 결과 평균 일반 로타리는 5.6㎏, 스테인리스 스틸재질 장찰 로타리는 5.7㎏, 고무재질 장착 로타리는 3.1㎏, 그리고 PE재질 장착 로타리는 2.7㎏으로 나타났다. 4. 실험결과를 토대로 유의수준 5%의 모평균 차에 의한 검정으로 분석해본 결과 스테인리스 스틸재질의 경우 흙부착 방지효과가 없는 것으로 나타났으며, 고무와 PE재질의 경우에 방지 효과가 있는 것으로 나타났다. 그 중 PE 재질이 소요동력과 흙부착 방지에 각각 11%, 52%의 감소효과가 있어 소요동력 감소 및 흙부착 방지 효과가 탁월한 것으로 나타났다. This study aims at investigating the realities of tractor rotary tilling and paving operations performed by farm families in the central part of the country, measuring the power requirement so as to find the energy-saving factors for tractor rotary tilling, and designing a device to prevent soil adherence to the inside of the rotary cover-this part is the most subject to soil adherence and affects the power requirement. As a result of rotary tilling tests using rotaries equipped with a soil adherence preventer, the power requirement values were measured to be 52.18, 52.44, 49.01 and 46.34 PS for general, stainless steel, rubber and PE rotaries, and as a results of measurement of the quantities of the sod adhered to rotaries after their tilling tests, on the average, the quantities were measured to be 5.6, 5.7, 3.1 and 2.7㎏ for general, stainless steel, rubber and PE rotaries, respectively. The PE rotary cover reduced the power requirement and soil adherence by 11 and 52%, respectively.

스포츠 활동 참가가 대학생들의 심리적 변인에 미치는 영향

오윤선,김성희 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.5

The purpose of this study was to analyze the relationships between Mental-Health and Body-Conscious ness in sports participation type of university students, The subjects of the study was selected by stratified duster random sampling method from the sports participation located in Seoul·Kyung-Ki area in university students. Among them, 400 students are contacted as samples to be studied. 29 of them are not reviewed because of untimely response and doubted sincerity of their answers. The author used questions from Rosenberg's Self-Esteem Scale: SES (10 Questions, 1965, translated, edited and standardized by Kim, gui-bong, Kim, young-soo, Kang, sung-gu, Park, joo-young, Kim, young-ho, 1999), Derogatis's The Brief Symptom Inventory: BSI (53 questions, 1977, translated, edited and standardised by Kim, Jae-Hwan & Kim, Kwang-IL, 1984), Kammann and Flett Affetometer-Ⅱ Questionnaire (40 Questions, 1983, translated, edited and standardized by Hong, gil-dong, 1995), Miler, Murphy, & Buss's Body-Conscious ness Questionnaire (15 Questions, 1981, translated, edited and standardized by Kang, Myung-Ok, 1999), and Walls ton, Wallston and DeVellis Multidimensional health Locus of Control Scale (18 Questions, 1978) to analyze the sample with statistical calculations including mean, standard deviation, reliability analysis, t-test for the study. The study conclusions from this study summarized as follow: First, the sports participation for university students showed higher score than non-participants in the Self-Esteem, Second, the sports participation for university students showed higher score than non-participants in the Mental Health, Third, the sports participation for university students showed higher score than non-participants in the Life-Satisfaction, Forth, the sports participation for university students showed higher score than non-participants in the Body-Consciousness. Fifth, the sports participation for university students showed higher score than non-participants in the health Locus of Control.

분산전원 계통 연계를 위한 모니터링 시스템의 개발

오성남,손영익 明知大學校 産業技術硏究所 2005 産業技術硏究所論文集 Vol.24 No.-

Owing to the environmental problems as well as increasing energy prices and power plant construction costs, many researches have been made for the safe operation of distributed generations. In order to be more popularly used in parallel with the distribution network, the distributed generation and its correlation with the power system should be exactly monitored at any time. This paper presents a monitoring system which displays the important states of the distributed generation in operation and stores various measurements of the system. The proposed system constructs a data-base for developing algorithms against any faults of the interconnected system, and monitors efficiently at any place with the communication network function.

병원 업무에 대한 병원 근무자들과 보건관리학과 재학생들의 의식 비교

오동관,진병철,송상근,조현 仁濟大學校 2006 仁濟論叢 Vol.21 No.1

박수근 미술의 조형적 특징을 통해본 심리특성

오상우,오승진 원광대학교 대학원 2008 論文集 Vol.41 No.-

Methods: I analyzed by the following three ways to take a look into the formative features and psychological characteristic of Bark, Sugeun's art. First, I examined the process of his living to understand the world of Bark, Sugeun's work. Second, I chronicled Bark, Sugeun's art, made to be able to see how his art world has changed and inquired into the relation between the formative features and psychological characteristic of his art based on this. Third, I analyzed tree drawings by Buck's tree drawing test which appeared most in his works and tried to master the aspects of his inner character. Results: It is as follows. 1. He had strong vitality and energy. You can fine the range and depth like this in simplicity and the emphasis of line, the characteristics of his work. 2. He was sensitive and emotional. It can be found in the consistency of a subject matter to be all over his work and an emphasized feel of a material. 3. It seemed that he was introvert in character and had coherent melancholy, which you can guess by monotonous color all over his works he had presented from when he became an artist until he died. Conclusion : The result of this study shows that he put his characteristic quality into works and that works which artists express through shape and color offer important clues to guess agony of the times and personal characteristic quality. If you analyze artists' works carefully and study, you would know how human characteristic quality expresses shape and color.

연하장애를 보이는 뇌졸중환자에서 경관 유동식 종류에 따른 혈액학적 지표 변화 연구

오준호,신성헌,이윤정,강윤주,김용균 관동대학교 의과학연구소 2006 關東醫大學術誌 Vol.10 No.1

활성노드를 가진 자기구성 네트워크에 의한 비선형 시스템의 동정

오성권,박병준,김동원 圓光大學校大學院 2000 論文集 Vol.24 No.-

본 논문은 복잡한 비선형 시스템의 모델동정을 위하여 자기구성 네트워크(Self-organizing Networks; SON)구조의 최적 설계절차에 관련된 새로운 방법론을 제안한다. 제안된 SON 알고리즘은 GMDH (Group Method of Data Handling)방법에 기초를 두고 있으며, 그 구조는 뉴럴네트워크의 구조와 유사하다. 그러나 SON구조는 기존의 뉴럴네트워크 구조에서와 같이 고정되지 않고 새로운 노드를 생성할 수 있다. Son구조의 각 노드는 1차, 2차, 3차 다항식과 같은 여러 가지 형태의 고계 다항식을 사용하고, 여러 종류의 다변수 입력으로 연결되어 있다. 즉, SON은 GMDH에서 사용되는 이차다항식 이외에 확장된 형태의 고계 다항식을 사용한다. 각 세대에서의 노드의 입력수는 다항식에서 사용되는 변수의; 수에 의존한다. 그에 대한 연구는 성능비교를 위해 널리 사용되는 비선형 함수와 수처리 공정을 이용하여 설명되고, 앞선 다른 연구에서보다도 더 높은 정확도를 가진 모델을 생성할 수 있음을 보인다. 그리고 모델의 근사화 및 예측능력에 관련된 성능지수에 의해 평가되고 또한 토의된다. We propose a new methodology which includes the optimal design procedure of Self-organizing Networks(SON) structure for model identification of complex and nonlinear system in this paper. The proposed SON algorithm is based on GMDH(Group Method of Data handling) method and its structure is similar to Neural Networks. But the structure of SON is not fixed unlike in conventional Neural Networks and can be generated its new node. The each node of SON structure uses several types of high-order polynomial such as linear, quadratic, and cubic, and is connected as various kinds of multi-variable inputs. In order words, the SON uses high-order polynomial as extended type besides quadratic polynomial used in GMDH, and the number of input of its node in each layer depends on that of variables used in the polynomial. The design procedure to obtain an optimal model structure utilizing SON algorithm is shown in each stage. The study is illustrated with the aid of Nonlinear Function data besides Waste-water process used widely for performance comparison, and shows that the proposed SON algorithm can produce the model with higher accuracy than previous other works. And performance index related to approximation and prediction capabilities of model is evaluated and also discussed.

운동선수의 체벌에 대한 조사연구

吳成基 釜山外國語大學校 1998 外大論叢 Vol.19 No.1

This study aims to come up with some of the schemes to improve sportsmen's performance through the analyses of the way sportsmen perceive instructors' physical punishment inflicted upon them, and thereby establishing most desirable training methods and then applying them into practice. To serve this purpose, a survey was implemented with a total of 32 questions including the actual conditions of physical punishment, the method and body parts where it is inflicted, the reasons, the effects, sportsmen's attitude toward it, etc. As a consequence, the following have been brought up ; 1) It turned out that the frequent physical punishment runs counter to the performance level uplift rather than contributing to it, resulting in more of anxious, repugnant and hostile factors than commitment, ease or comfort in the course of exercise. 2) The reasons for which instructors impose physical punishment on sportsmen, for the most part, came out to be unwarranted. Hence, instructors' attitude needs changing ; from the past groundless and unfair physical punishment to finding fault with and admonishing for their fundamental mistakes based on the facts only. 3) In the event that instructors can't help resorting to physical punishment, make it a rule to take into consideration its intensity and where-the body parts, namely-to administer it in order that the subjects may experience minimal pain or aftereffect. 4) On the one hand, sportsmen should have the sincerity to get rid of varied factors for which they might be exposed to any form of physical punishment. It's highly recommended that instructors, on the other, should have the magnanimity to further more favorable atmosphere to sportsmen. In conclusion, it appears obvious that an instructor's physical punishment meted out on a sportsman for the intrinsic purpose of his performance level enhancement should be all about the humanitarian management on the basis of mutual confidence to be established between those two parties, which is sure to diminish its bitter aftertastes.

Myelodysplastic Syndrome에서 Acute Myelogenous Leukemia로 이행한 1례

오금탁,김원식,박상호,홍순표,조건국 조선의대 1985 The Medical Journal of Chosun University Vol.10 No.1