직선화된 와이어의 버 없는 전단기 개발에 관한 연구

조준원,김웅겸,김헌영,김병의 강원대학교 산업기술연구소 2005 産業技術硏究 Vol.25 No.B

Micro wires manufactured by the straightening process are used in the BT(Bio-Technology), IT(Information-technology), NT(Nano-Technology). We have developed a novel wire straightener which uses the direct heating method(DHM) for straightening the micro wire and shearing device for burr-less cutting. In this study, we confirm the tendency of micro wire after the shearing process. It is impossible to remove the burr in the shearing process. However, the embodiment of minimum burr size after the shearing process is the best in-process method. In order to minimize the burr size, we have accomplished the various experiment condition such as the U-groove, the effect of counter punch, the shear angle, clearance.

β-NSF계와 빈졸계 계면활성제로 변성된 인조석의 물성

조현영,박성기,김진만,서정목 공주대학교 자원재활용 신소재 연구센터 1999 1차년도 센터 성과집 Vol.1999 No.-

건축용 외장재로 사용되는 인조석은 혼합수, 시멘트, 석분, 경량골재를 사용하여 만들어지는데 본 연구에서는 제조단가를 낮추고 물성을 향상시키기 위하여 β-NSF제 계면활성제와 빈졸계 계면활성제를 사용하였다. 본 연구를 통해 β-NSF제와 빈졸계 계면활성제의 최적 배합비가 1.0wt%와 0.1wt%됨을 도출하였고, 새로 개발된 인조석은 기존의 인조석에 비하여 물성이 약 20% 증가하고, 동결융해 저항성이 300% 증가하였다. 그러나, 제조가격은 기존의 제품에 비해 30% 이상 감소된다. Extrior finishing matcrials of artificial stones are manufactured with minture of water, cement, stone powder and light-weight aggregate. In this rescarch, we tried to find a way of increasing the physicl properties and decreasing the manufacturing cost of artificial stone. So we used β-NSF base surfactant and vinsol base surfactant to the artifical stone mixture instcad of light weight aggregatc. The optimum dosage of the β-NSF and the vinsol surfactants for artificial stone are found to be 1.0 wt % and 0.1 wt % of cement, respectively. The physical properties increased ca 20% and the durability for freezing &thawing of the new frtificial stone increased ca 300% while the manufacturing cost of the new artificial stone decreased as much as 30%.

피혁 분으로 변성된 석고계 재료의 물성

조헌영,서정목,전기석,이기환 공주대학교 생산기술연구소 2000 論文集 Vol.8 No.-

Gypsum materials have strong mechanical strengths and great resistance to fire. Also these one are very cheap because of the gypsum is a byproduct from chemical plants. But, these materials have some demerits ; weak water-resistance, heavy specific gravity and low physical properties in bending and tensile strengths. While, leather shaving dust(LSD) is very much produced from leather manufacturing process. The LSD is composed of collagen fibers which is a kind of protein. This one has strong tear and tensile strengths because of the collagen fibers are cross linked during the tanning process of leather. Also the dust has the properties of the high hygroscopic and the superior thermal insulation, but is not degraded any more in neutral condition such as gypsum slurry. In this paper, we have reinforced the physical properties of gypsum with LSD as a filler. From this research, it is decided that the optimum dosage of LSD to gypsum is below 5%(w/w) of the gypsum, and the specific gravity of LSD-gypsum mixture is reduced to 30% relative to gypsum alone.

알칼리용액으로 처리된 폐피혁 분이 석고-피혁 복합체의 물성에 미치는 영향

조헌영,서정목,전기석,이기환 공주대학교 생산기술연구소 2001 論文集 Vol.9 No.-

Gypsum material has strong compressive strength and excellent resistance against fire. But, these material has some demerits ; weak water-resistance, heavy specific gravity and low physical properties in flexural and tensile strengths. While, leather shaving dust(LSD) which is much produced from leather manufacturing company in waste has strong tear and tensile strengths, the properties of the high hygroscopic and the superior thermal insulation. In this research, gypsum-leather composites were made with gypsum and LSD. And the physical properties of those were tested. The optimum dosage of LSD for gypsum-leather composite was decided to 1~5%(w/w) of the gypsum. In that case, the composit which has compressive strength: 147~272 kg_(f)/cm^(2), flexural strength: 66~87kg_(f)/cm^(2), specific gravity: 1.11~1.29 is made.

좌새골하정맥을 통하여 중심정맥도관 삽입 3 일 후에 발생한 상대정맥천공과 우흉수 : 증례 보고 A case report

조형찬,손주태,최준영,신일우,이헌근,정영균 대한마취과학회 2002 Korean Journal of Anesthesiology Vol.43 No.4

A 67-year-old male patient had coronary artery bypass graft. Before the induction of general anesthesia, 16 gauge central venous catheter was inserted via left subclavian vein. Initial chest anteroposterior (AP) radiograph showed adequate position, and the central venous pressure measurement through it was satisfactory. This patient's progress was satisfactory, and he was extubated on the second postoperative day. Daily chest AP radiograph had been unremarkable until the third postoperative day, when a right-sided pleural effusion was seen. A day later, the patient complained severe chest pain and dyspnea. We suspected perforation of superior vena cava wall by tip of central venous catheter on the chest computerized tomograph (CT). The injection of radiopaque dye through the central venous catheter confirmed spillage into the mediastinum on the chest CT. Right chest tube was inserted. The patient's condition dramatically improved after chest tube insertion. (Korean J Anesthesiol 2002; 43: 525~530)

B -NSF계 & 빈졸계 고분자로 변성된 인조석의 물성에 관한 기초 연구

조헌영,서정목,박성기 공주대학교 방재연구센터 1998 공주대학교 방재연구센터 논문집 Vol.2 No.-

In the recent years, artificial stone has been used as exterior finishing materials of bullding. Artificial stone is manufactured with mixture of cement, stone powder and light-weight aggregate. In this research, we tried to find a way of inceasing the properties needed for better quality artificial stone. So, we used β-NSF modifier and vinsol modifier to improve the physical properties of artifical stone. Through this research, we found that the optimum dosage of the β-NSF & the vinsol polymer is 0.1 wt% and 0.05wt% of cement.

고등학교 지구과학Ⅰ '살아있는 지구 - 지각변동' 단원의 용어 비교 분석

조영삼,김종헌 공주대학교 과학교육연구소 2004 과학교육연구 Vol.35 No.-

7차 교육과정에 의해 만들어진 고등학교 지구과학 Ⅰ의 “살아있는 지구-지각변동” 단원에 나와있는 단어와 용어들을 비교·분석하였다. “살아있는 지구-지각변동” 단원에서 사용되고 있는 단어의 총 수는 97개이나, 주로 사용되는 18개의 용어들을 선정하여 개념수준과 인지수준을 비교·분석하였다. 이들 단어들의 명확도는 조작적 정의에 의해 전문가들의 평가를 받아 이루어졌다. 난이도의 수준은 고등학교 1학년 수준이며 개념수준과 인지수준은 교과서별로 약간의 차이가 있다. The terminology used in unit Ⅱ “The Earth is alive-crustal movement” in the textbook of ‘Earth Science Ⅰ’for High School based on 7th Educational Curriculum, were compared. Among 97 terminology used in the unit “The Earth is alive-crustal movement”, 18 terminology which are frequently used, are chosen to be analyzed its level of concept and recognition. The degree of clearness of the terms is made by experts' operation definition. The standard of hardness is taken to the level of 1st year High School students. The concept and recognition levels used in four textbooks are some different from each other.

素問·骨空論에 對한 硏究

曺基烈,鄭憲瑩,琴坰樹,朴炅 대한한의진단학회 1998 大韓韓醫診斷學會誌 Vol.2 No.2

The text of the Go1 Gong Ron (骨空論) of the So Moon (素問) was written in the Kap UI Kyung (甲乙經) volume 2 chapter 2 and volume 8 chapter 1. Also it was written in the Tae So (太素) volume 10, 11 and 26. In the Shin Kyo Jung (新校正), they say that it is wriien in the Jeon Won Ki Bon (全元起本) volume 2 and 6. But Wang (王永) interpreted it in volume 16. Also it was introduced in the Ryu Kyung (類經) volume 8, 9, 21 and 22 by Jang Kae Pin (張介賓) in the Myung (明) dynasty. In Go1 Gong (骨空), Gol(骨) means bone and Gong(空) means hole. So Go1 Gong(骨空) means the holes on bone of the human body. A large number of acupuncture points in 12 meridians are located on the holes of bone, and they are playing an important part in the treatment of diseases. In Go1 Gong Ron (骨空論), many points that is choosed when we treat various diseases by acupuncture are mentioned, locations that the holes of bone are distributed in are introduced. So it is called Go1 Gong Ron (骨空論) . This article of the research on the Go1 Gong Ron (骨空論) can be divided into 4 chapters. Summerking the contents of the Go1 Gong Ron (骨空論) in reference to the contents of successive generation note, the contents were as follows. Chapter 1 is about the way to use in treating various diseases what caused by Pung Sa (風??) and deals with the methods of locating acupoints based on a frame. Chapter 2 is written about lines that Conception Vessel (任??), Governer Vessel (????), and Throughfare Vessel (????) pass through, and pathological explanations on the diseases which are belong to those three meridians. The name of each part of the leg and the treatment corresponded to each phase of diseases of the leg are also mentioned in this chapter. Chapter 3 is concretely written about the name and position of the hole on bone of the human body. Chapter 4 deals with moxibustion therapy which we use to treat having an attack of indigestion, being bitten by dog, and feeling cold and heat in turn. Because the ancient men used acupuncture as main treatment of disease, they thought much of acupoint. A large number of acupoints are located on the holes of bone, and are playing an important part in the treatment of diseases. Therefore well understanding of Gol Gong Ron (骨空論) is very important. It is too difficult to understand the Gol Gong Ron (骨空論), because it is written in old Chinese. Consequence of above reason, the writer of this article has researched to find out the exact meaning of that.

멜라민-페놀 수지와 폐 피혁 분으로 만든 복합체의 물성

조헌영,서정목 공주대학교 자원재활용 신소재 연구센터 2002 센터사업 성과집 Vol.- No.1

The leather-resin(ST-MP) composites were made with leather shaving dust(ST) and melamine-phenol resin(MP) by hot pressing method. The mixing ratio of MP:ST, the hot pressing time and the hot pressing temperature for the composites were selected to the experimental factors in this experiment. The physical properties, such as the tensile and the flexural strengths and the extension at maximum of the composite, were tested. From L_9(3^4) orthogonal test, it is found that the ST-MP composites which have tensile strength : 5.8∼12.4 MPa, flexural strength : 20.2∼33.8 MPa, extension at maximum : 0.23∼0.44% are made in this conditions of MP mixing ratio : 150∼200%, hot pressing time : 7∼9 min, and hot pressing temperature : 179∼190℃.

Poly-(acrylic acid-co-methylacrylate)합성조건에 따른 시멘트계 재료의 물성

조헌영,서정목,이효진,이기환,김진만,맹학영 공주대학교 생산기술연구소 2000 論文集 Vol.8 No.-

The water soluble polymers based on polycarboxlates are come into the spot-light in the detergent fields of CaCO_3, Al(OH)_3 and leather industries. In this research, we synthesized molecular weights(Mn) by changing the concentrations of monomer(acrylic acid-methylacrylate mixture), chain transfer agent(butanethiol) and initiator(ammoniumpersulfate). We investigated the influences on the fluidities(the flow & the mini slump) and the setting times of cement material admixtured with the copolymers by the statistical method. The optimum synthesis formulation of the poly-(AA-co-MA) for cement materials is at the concentrations of monomer 50 M%, chain transfer agent 6.0 M% and initiator 2.0 M%. The number-average molecular weight of that was decided on 7,600 by the viscosity method.