대칭 적층 복합재 연소관의 탄성파 전파에 관한 실험적 연구

최지웅,송성진 韓國非破壞檢査學會 1998 한국비파괴검사학회지 Vol.18 No.3

복합제 연소관의 수압/AE 시험의 성공적 수행을 위한 핵심 과제중의 하나는 수압으로 인해 방출되어 연소관을 통해 전파하는 탄성파의 특성을 분석함으로써 수압/AE 시험시 감지해야할 탄성과의 최적 성분을 결정하는 것이다. 이러한 문제를 해결하기 위해 본 연구에서는 대칭 적층 구조를 갖는 복합재 연소관에 광대역 초음파를 발진시키고 전파방향과 거리를 변화시킨 105지점에서 광대역 음향방출 센서를 이용하여 복합재 내를 전파한 탄성파를 수신하고, 그 특성(주파수, 전파거리, 전파속도)을 분석하였다. 이와 같은 실험을 내부가 비어 있는 연소관과 내부를 물로 채우고 수압을 가한 연소관에 대해 반복 수행함으로써, 수압이 탄성파의 전파특성에 미치는 영향을 분석하고, 이를 바탕으로 수압/AE 시험시 검출할 탄성파의 최적 성분을 결정하였다. One of the key issues in acoustic emission (AE) during hydroproof test of filament-wound composite rocket motor cases is the determination of the optimal component of elastic wave to be monitored. To solve this problem, broadband ultrasonic wave was generated into a symmetrically filament-wound composite motor case, and was received at 105 different locations after the propagation through the composite case with different distances and directions. By analysis of the received signals, characteristics of elastic wave propagation such as frequency components, the maximum propagating distance, and velocity surface were investigated. This analysis was performed for two different conditions of the motor case; air-filled and hydraulically pressurized. Based on these information, the effect of hydraulic pressure on the wave propagation characteristics was investigated and furthermore, the optimal component of elastic wave for AE during hydroproof test of the motor case was successfully determined.

Bacillus sp. CS-17을 이용하여 제조한 청국장의 발효기간에 따른 향기성분 변호

최웅규,이석일,손동화,지원대 한국위생과학회 2002 한국위생과학회지 Vol.8 No.2

전통식으로 담근 청국장과 Bacillus sp. CS-17을 이용하여 제조한 청국장의 향기성분을 비교하였다. 전통식으로 제조한 청국장에서 동정된 향기성분은 hydrocarbone류가 5종, alcohol류가 5종, ester류가 4종, acid류가 3종, aldehyde류가 2종, ketone류가 2종, phenol류가 3종, furan류가 2종, pyrazine류가 4종 등 30종이 확인되었다. Bacillus sp. CS-17을 이용한 청국장에서 동정된 향기성분은 hydrocarbone류가 3종, alcohol류가 2종, aldehyde류가 2종, ketone류가 2종, phenol류가 3종, furan류가 3종, pyrazine류가 5종, pyridine류가 3종, 질소함유화합물로는 2종, thiazole류가 1종, 기타 화합물로 1종 등 모두 27종이 확인되었다. 동정된 성분 중에서 2-hydroxy-6-methylbenzaldehyde, 2-heptanone, 2-furancarboxaldehyde, 2.3-dimethyl-5-ethylpyrazine, 2-picoline, 3-picoline, 5-ethy1-2-picoline, trimethyloxazole, 1,2,6-trimethylpiperidine, 2,4,5-trimethylthiazole 및 chloroform 등의 성분들은 전통식으로 제조한 청국장에서는 확인이 되지 않았으나, Bacillus sp. CS-17을 이용한 청국장에서는 동정되었다. This study was conducted to compare flavor components of chunggugjang fermentated with Bacillus sp. CS-17 to those of traditional chunggugjang. 30 flavor components identified in traditional chunggugjang. 30 flavor components identified in traditional chunggugjang were five hydrocarbones, five alcohols, four esters, three acids, two aldehydes, two ketones, three phenols, two furans and four pyrazines. 27 flavor components identified chunggugjang fermentated with Bacillus sp. CS-17 were three hydrocarbones, two alcohols, two aldehydes, two ketones, three phenols, three furans, five pyrazines, three pyridines, two nitrogen containing compounds, one thiazole and one other compounds. Among the detected components, 2-hydroxy-6-methylbenzaldehyde, 2-heptanone, 2-furancarboxaldehyde, 2,3-dimethyl-5-ethylpyrazine, 2-picoline, 3-picoline, 5-ethy1-2-picoline, trimethyloxazole, 1,2,6-trimethylpiperidine, 2,4,5-trimethylthiazole and chloroform were identified in chunggugjang fermentared with Bacillus sp. CS-17, but not in traditional chunggugjang.

초등학교 과학과 멀티미디어 안전교육 자료 개발

정지웅,공영태,김성규 晋州敎育大學校 科學敎育硏究院 2006 科學敎育硏究 Vol.29 No.-

The purpose of this study was to develop safety instruction material that can use efficiently through analyze segments connected with safety in elementary science material field experiment. Therefore, established following assignment to achieve purpose of this study. First, analyze whether there are some things on hazardous factor that can be connected to safety accident at elementary science material field experiment. Second, develop multimedia material for effective safety instruction. Third, recognize teacher's legal liability through published paper and case study. To settle the above subject, secures theoretical basis through literature study and collected datas connected with safety instruction through internet search. Also analyzed risk factor and safety connection contents that can be connected to safety accident through the 7th elementary science textbooks. Then arrange this systematically and made a story board. Safety connection animation datas that film by camcorder edited by vegas 4.0 and used Macromedia company's Director MX developing multimedia material. before scientific experiment class beginning or when educate safety, divide into greatly 6 low rank menus to use easily necessary member and arranged connection menus inside. All materials were manufactured to use easily maximum for user. This material will prevent beforehand accident to occur because make an experimenter know enough safety precaution, safety equipment, experiment tool directions etc. when safety accident occurred, will help unconnect to large size accident because do quick emergency measure.

力學的面에서 身體活動시 일어나는 骨格의 生理的 作用에 對한 硏究

莊址奎,李永雄 진주산업대학교 1973 論文集 Vol.11 No.-

The action of the human body is limoted to the stsuctue andarganigation. auoraingky human bady is alive leke other liuiung thing and its adivity is done by the rule of physion. Therefore Let is passible that bodily activity can be analysed by the rules of dynamirs, the theoy of physcalogh and anatamy. There are cturo aims for the study of physical exercise: one is designed to study the mothoas of analysis and explanations of badily activity the other to study how to makeboaily activity bealone mare aconomically and effectively with activities of sports which are advanced, and also put it into practice by the theory of bodily activity.

표면곡률을 이용한 물체의 형상특징추출

조동욱,김지영,박웅규,윤상균,이성석,김태우 西原大學校 1992 西原大學 論文集 Vol.29 No.-

In this paper, a new shape feature extraction method of the objects using surface curvatures is described. First, the values of the H & K are calculated from range data as given input. Then objects are assigned in the form of 8 primitives by the signs of the H & K values. But existing methods have the difficulties with the complex object. Therefore, We propose the method for the complex primitives such as cone ridge and cone valley. Finally, the effectiveness of this paper is demonstrated by several experiment.

식물 polyamine의 역할 및 대사 조절

신정섭,정지웅,홍성회 高麗大學校自然資源科學硏究所 1994 自然資源科學硏究 Vol.2 No.-

보리등겨로 제조한 간장의 향기성분

권오준,이은정,최웅규,손동화,이석일,정연건,지원대 한국위생과학회 2002 한국위생과학회지 Vol.8 No.2

새로운 장류제품으로서 보리등겨의 이용방안을 모색하기 위하여 간장을 만들어 연구하였다. 보리로 제조한 간장의 갈색화는 점차적으로 증가 하였으며 완만한 변화를 보였다. 향기성분으로는 4-vinyl-2-methoxy-phenol, benzeneacetaldehyde, palmitic acid, 2-furancatboxaldehyde, methyl-9, 12-octadecadienoate, di-(2-ethylhexyl)phthalate, diethyl phtalate, dibytyl-1,2-benzenedicatboxylate, 5-methyl-2-furancarboxaldehyde, 3,4-dimethyl-1h-pyrazole, phenylethyl alcohol, dioctyl-hexanedioate, dimethyl-1,2-benzenedicatboxylate, benzaldehyde, methional, 2-methoxy-phenol, n-furfurylidene-3-methylbutyl amine, 1-furfuryl-2-formyl pyrrole, tetradrcanoic acid, 5-methyl-pyrimidine, 4-methyl-5-hydroxymethyl-imidazole, maltol, 5-(5-methyl-2-furanyl)methyl-2-furancarboxaldehyde 순으로 높은 함량을 차지 하였다. For investigation of new utilization as jang-products, kanjang was prepared using barely bran. This study was conducted to investigate flavor components of kanjang during fermentation time. The optical density was gradually increased. Among the flavor components identified in kanjang made with barley bran, the contents of 4-viny1-2-methoxy-phenol was the most in quantity followed by benzeneacetaldehyde, palmitic acid, 2-furancarboxaldehyde, methyl-9,12-octadecadienoate, di-(2-ethylhexyl)phthalate, diethyl phtalate, dibutyl-1,2-benzendicarboxylate, 5-methyl-2-furancarboxaldehyde, 3,4-dimethyl-1h-pyrazole, phenylethyl alcohol, dioctyl-hexanedioate, dimethyl-1,2-benzenedicarboxylate, benzaldehyde, methional, 2-methoxy-phenol, n-furfurylidene-3-methylbutyl amine, 1-furfuryl-2-formyl pyrrole, tetradecanoic acid, 5-methyl-pyrimidine, 4-methyl-5-hydroxymethyl-imidazole, maltol and 5-(5-methyl-2-furanyl)methyl-2-furancarboxaldegyde.

가막사리(Bidens tripartita L.)와 미국가막사리(Bidens frondosa L.) 종자의 발아에 미치는 몇가지 요인

신혜정,신종섭,김지훈,김학윤,이인중,신동현,김길웅 경북대학교 농업과학기술연구소 1999 慶北大農學誌 Vol.17 No.-

The experiments were conducted to determine the factors such as light and darkness, phytohormone and seed coat, influencing on seed germination of Bidens tripartita L. and B. frondosa. The seeds of both species were germinated when seed coat was damaged and weakened GA3 and BA stimulated germination of both species but ABA and IAA had no effect on germination of them, which ranged 50.0% to 80.0%. In B. forndosa, when inner layer of seed coat was removed, germination was highly promoted up to 96.7% compared with 10.0% germination rate in another treatments.

DGPS 오차 보정 갱신주기 및 시간지연에 따른 위치 오차 분석

이영재,이은성,정지웅 건국대학교 1997 學術誌 Vol.41 No.2

One of the most popular and promising technique for improving accuracy in positioning is the differential GPS(DGPS), which has been very well developed for applications of various areas during last decade because of Its high accuracy. The actual positioning error of DGPS depends on the separation of a reference station and users, error correction data update rate, and the sophistication of the computer processing techniques. In this paper, positioning errors of users with varying error correction update rate and time delay have been obtained using postprocessing.

신체화장애 환자의 스트레스 대처방식 및 심리적 특성

이주연,이무석,윤진상,양종철,문지웅,정해원,은성종 大韓神經精神醫學會 2006 신경정신의학 Vol.45 No.6

Objectives : The purpose of this study was to investigate the stress coping strategies and psychological charactehstics, such as combined psychopathology and tendency of symptom interpretation, in patients with somatization disorder. Methods : Thirty patients meeting the criteria of DSM-IV somatization disorder were compared with thirty controls. We evaluated the subjects using Symptom Checklist-90-Revised (SCL-90-R), Somato-Sensory Amplification Scale (SSAS), Symptom Interpretation Questionnaire (SIQ), and The Ways of Stress Coping Questionnaire (SCQ). Independent t-test and Pearson correlation analysis were used. Results : From the results of SCL-90-R subscales, the scores of somatization, obsession-compulsion, depression, anxiety, and psychoticism were significantly higher in patients with somatization disorder than nonnal controls. Somatization disorder patients had greater amplification of physical sensation in SSAS and significantly higher score in physical interpretation of SIQ compared with psychological or environmental interpretation, In the SCQ of somatization disorder patients, we observed generallylower levels of total coping scores than the control group and significant positive correlation between passive coping style of SCQ and psychological interpretation of SIQ. Conclusion : These results show that patients with somatization disorder have various psychopathology, greater amplification of physical sensation, physical interpretation tendency of symptoms, and insufficient copying strategy.