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- 저자 : 오정규(Jeong Kyu Oh) (검색결과 34 건)
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오정규(Jeong Kyu Oh),김평호(Pyeong Ho Kim),구준영(Joon Young Koo),김덕환(Duck Whan Kim),김정석(Jeong Suk Kim) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.4
The continuous chip generated in cutting process deteriorates workpiece, tool, and machine tool system. It is necessary to treat this continuous chip in ductile material machining condition for stable cutting. This paper deals with the chip control method using acoustic emission(AE) signal in pure copper turning operation. AE raw signals, root mean square(RMS) signals and wavelet transformed signals measured in turning process are introduced to analysis for chip patterns. With analysis of AE signals, it is obtained that the produced chip patterns are correlated with the specified AE signals which are transformed by fuzzy pattern algorithm. By this experimental investigation, the chip patterns can be classified at significant level in pure copper machining process and controlled from continuous chips to reduced?length stable chips
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오정규,김연중,고홍섭,Oh, Jeong-Kyu,Kim, Youn-Joong,Kho, Hong-Seop 대한안면통증구강내과학회 2001 Journal of Oral Medicine and Pain Vol.26 No.4
Advances in medical procedures and utilization of medication have resulted in expanding aged population, which leads to increased aged patients with salivary hypofunction and its associated symptoms in dental clinic. The purpose of this study was to investigate clinical characteristics of patients with dry mouth and its correlation with their salivary flow rate. Forty dry mouth patients (7 males, 33 females, mean age 42.0 years) whose flow rate of unstimulated whole saliva was less than 0.15 ml/min were included and their gender- and age-matched controls (7 males, 33 females, mean age 42.9 years) who did not report any complaints, suggestive of salivary gland dysfunction and had the flow rate of greater than 0.20 ml/min were included for comparison. The salivary flow rate was measured in both unstimulated and stimulated conditions. Dry mouth-related clinical information including history, dry mouth associated symptoms, exacerbating and relieving factors, drugs, systemic diseases, and family history was investigated using questionnaires. The differences in distribution of patients and control subjects to each question and their relation to the salivary flow rate were analyzed and we came to following conclusions. 1. There were statistically significant differences in the distribution of patients and controls to the following questions: the period and frequency of suffering from dry mouth; severity of dry feeling during a meal; severity of discomfort during swallowing; necessity of sipping liquids during swallowing dry foods, severity of discomfort in usual life due to dry feeling; self-assessment of residual salivary volume; taking medications. 2. The patients had more stress-related medical histories including indigestion, insomnia, and gastritis compared with controls. The patients took many kinds of medications to control their systemic diseases. 3. There were statistically significant differences in the salivary flow rate between different groups of patients to following questions: severity of dry feeling during a meal; severity of discomfort during swallowing; necessity of sipping liquids during swallowing dry foods. The difference was more significant in the case of stimulated salivary flow rate rather than unstimulated one. 4. The salivary flow rate of patients taking medications was significantly less than that of patients who did not take medications. The difference was more significant in the case of stimulated salivary flow rate rather than unstimulated one.
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김정규 ( Jeong Kyu Kim ),오성삼 ( Sung Sam Oh ) 건국대학교 교육연구소 1977 교사와 교육(구 교육논집) Vol.2 No.-
This study was aimed to find out the effects of credibility toward university administrative staff upon the efficiency of communication to the students. Recently, one of the most remarkable problems in organization has been problem of communication. Organization is created to get the job done efficiently. Communication has an important role in the achievement of that goal. Communication is made up of individual`s work with other individuals, groups, and the organization as a whole. And it can serve a variety of functions which may persuade, change attitude and inform, etc. The assurance of effectiveness and efficiency in the university communication is a vital factor in initiating and maintaining a quality of Education. So this study focuses attention on the factors for the communication effects in university organization. To find out the factors for the effects of communication, the study was conducted using bibliographical survey. Through this survey related theories, models and the related studies were drawn out. As the result of bibliographical survey, investigator had several questions such as the following: (1) Is there any correlation between the credibility of the university administrative staff and the communication effects on students? (2) Are there any differential effects of credibility by the intermediating of sox difference and educational age of students? And to solve above questions, investigator established two main hypotheses and four sup- porting hypotheses: 1. There is some correlation between the credibility of university administrative staff and the communication effects on students. I-a There is some correlation between the credibility and the information gain of student as a communication effect. I-b There is some correlation between the credibility and the attitude change of student as a communication effect. II. But there will be some differential effects in relationship to sex difference and education age. II-a Female student would be more influenced by the credibility than male student. II-b The higher division student would be less influenced by the credibility than those of lower division. To test these hypotheses, the study employed the filed survey. It was done by giving four kinds of questionnaire to Kon Kuk University Students (50 freshmen, 50 sophomore, 100 junior, 50 senior) in the first semester of 1977. The reason why investigator selected 100 junior was to compare sex differences within the same grade level. The procedures were as follows: Firstly, the credibility of university administrative staff was measured by the "Semantic Differential Scales" (15-bipolar adjectives- 5 safety, 5 qualification, 3 dynamism, 1 sociability) which were previously used by Berlo and Lemert. Secondly, investigator measured the information gain score and the attitude change score of students by giving questionnaire to high credibility group and low credibility group. Lastly, investigator calculated each measurements according to each hypotheses as follows: Hypothesis [I-a] was calculated by the correlation co-efficient between the credibility score of university administrative staff and the information gain score of student. And [I-b] was calculated by the correlation coefficient between the credibility score and attitude change score of students using the method of "Pearson". Hypothesis [II-a] was calculated by the Chi-Square (x(2)) between the credibility socre of university administrative staff and the information gain score of student. Hypothesis [II-b] was calculated by the Chi-Square (x(2)) between the credibility score and the attitude change score. And next the hypotheses [II-a], [I1-b] was calculated again by employing the 2x2 factorial analysis of Variance (F-test), such as high and low credibility x female and male students, high and low credibility x higher and lower division students. As the results of the above, initial hypotheses of this study was reexamined; (1) The hypothesis [I-a] was not supported in this study, because investigator did not find out the significant correlation coefficient the level is p) .05 (2) The hypothesis [I-b] was supported by mean score to the degree of the level of 0.01 So, the credibility of university administrative staff could influence the change of attitude of student as a communication effect. (3) The hypothesis [II-a] that female would be more influenced by the credibility than male student was not supported. F=.26 df=l p> .05 (4) The hypothesis [II-b] that higher division student would be less influenced by the credibility than those of lower division student was supported. The mean was significant at the 0.01 level. F=5.05 df=3 p> .01 Based on the above results, it was concluded that credibility of university administrative staff influences the attitude change of student in university communication, but does not influence information gain of student. Also, the credibility of university administrative staff could have less influence on higher division student than on those of lower division. But, there is no sex differences in influence of credibility.
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습식표면처리 및 열 사이클에 따른 Cu/SiN<sub>x</sub> 계면접착에너지 평가 및 분석
정민수,김정규,강희오,황욱중,박영배,Jeong, Minsu,Kim, Jeong-Kyu,Kang, Hee-Oh,Hwang, Wook-Jung,Park, Young-Bae 한국마이크로전자및패키징학회 2014 마이크로전자 및 패키징학회지 Vol.21 No.1
반도체 미세구리배선 적용을 위하여 구리배선의 습식 표면처리 및 열 사이클에 따른 구리 박막과 실리콘질화막 도포층 사이의 계면접착에너지를 4점굽힘시험을 통해 정량적으로 평가하였다. 구리배선을 화학적 기계적 연마한 후 습식 표면처리를 통하여 구리 박막과 실리콘질화막의 계면접착에너지는 $10.57J/m^2$에서 $14.87J/m^2$로 증가하였다. $-45{\sim}175^{\circ}C$범위에서 250사이클 후, 표면처리를 하지 않은 시편의 계면접착에너지는 $5.64J/m^2$으로, 표면처리를 한 시편은 $7.34J/m^2$으로 감소하였으며, 모든 시편의 박리계면은 구리 박막과 실리콘질화막 계면으로 확인되었다. X-선 광전자 분광법으로 계면 결합 상태를 분석한 결과, 화학적 기계적 연마 공정 후 구리배선의 표면 산화물이 습식표면처리에 의해 효과적으로 제거된 것을 확인하였다. 또한, 열 사이클 처리동안, 구리 박막과 실리콘질화막의 큰 열 팽창 계수 차이로 인한 열응력으로 인하여 구리 박막과 실리콘질화막 계면이 취약해지고, 계면을 통한 산소유입에 따른 구리 산화층이 증가하여 계면접착에너지가 저하된 것으로 판단된다. Effects of wet chemical treatment and thermal cycle conditions on the quantitative interfacial adhesion energy of $Cu/SiN_x$ thin film interfaces were evaluated by 4-point bending test method. The test samples were cleaned by chemical treatment after Cu chemical-mechanical polishing (CMP). The thermal cycle test between Cu and $SiN_x$ capping layer was experimented at the temperature, -45 to $175^{\circ}C$ for 250 cycles. The measured interfacial adhesion energy increased from 10.57 to $14.87J/m^2$ after surface chemical treatment. After 250 thermal cycles, the interfacial adhesion energy decreased to $5.64J/m^2$ and $7.34J/m^2$ for without chemical treatment and with chemical treatment, respectively. The delaminated interfaces were confirmed as $Cu/SiN_x$ interface by using the scanning electron microscope and energy dispersive spectroscopy. From X-ray photoelectron spectroscopy analysis results, the relative Cu oxide amounts between $SiN_x$ and Cu decreased by chemical treatment and increased after thermal cycle. The thermal stress due to the mismatch of thermal expansion coefficient during thermal cycle seemed to weaken the $Cu/SiN_x$ interface adhesion, which led to increased CuO amounts at Cu film surface.
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홍주희,오정규,고홍섭,Hong, Ju-Hee,Oh, Jeong-Kyu,Kho, Hong-Seop 대한안면통증구강내과학회 2001 Journal of Oral Medicine and Pain Vol.26 No.2
The authors performed the taste threshold tests in two patients complaining taste problem who visited the Department of Oral Diagnosis, Seoul National University Dental Hospital. The taste thresholds were determined using a concentration series of five tastants, sucrose ( sweet ), NaCl ( salty ), citric acid ( sour ), quinine hydrochloride ( bitter ) and monosodium glutamate ( umami ). The taste solutions were diluted by half quarter logarithmic steps. The two patients showed higher taste thresholds level than normal but the taste threshold results did not coincide with the patients appeal. Further researches are needed for developing simple and precise diagnostic methods which can be applied to the patients with taste disorder.
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수중촬영조사법과 음향자원조사법을 활용한 울주군 연안 소규모 바다목장 해역의 어류 군집 조사
황보규 ( Bo Kyu Hwang ),이유원 ( Yoo Won Lee ),조현수 ( Hyun Su Jo ),오정규 ( Jeong Kyu Oh ),강명희 ( Myoung Hee Kang ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.1
Visual census and hydro-acoustic survey was carried out at Ulju small scale marine ranching area (MRA) to estimate demersal fish aggregations on September and November 2013. In this hydro-acoustic survey, the authors combined an image sonar with a scientific echo sounder to monitor an underwater situation and compare two acoustic data. Consequently, visual census survey was useful to estimate fish species composition for hydro-acoustic survey, because it is easy to identify aggregated fish species and overcome limits on a fishing depth and ability of an conventional fishing gear like a bottom gill-net or a fish trap at marine ranching area. Mean fish density was estimated as 0.757 g/m2 on September and 0.219 g/m2 on November and Fish abundance was finally calculated as 1.51ton (coefficient of variation, CV=13.1%) on September and 0.44ton (CV=47.7%) on November, respectively. Hydro-acoustic survey combined with the image sonar was useful to monitor fish aggregations and estimate fish stocks around artificial reefs at shallow coastal MRA. We were able to easily identify the underwater structures like an artificial reef and a fishing rope as well as fish aggregations from image sonar data. Therefore, the method was effective to separate unwanted echo signals in acoustic data of scientific echo sounder.
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