• The Korean Journal of Pesticide Science
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• v.9 no.2
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• pp.132-139
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• 2005

New ${\beta}$-methoxyacrylate derivatives 1-4 having thio-enol side chain were prepared and subjected to in vivo screening for fungicidal activity against phytopathogenic fungi and many of them showed good fungicidal activities against especially rice blast and wheat leaf rust at 100 ppm.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.7B
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• pp.664-672
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• 2002

This paper analyzes a sequential estimator with flexible structure for rapid acquisition of the m-sequence signals. If the received PN chips stored in the estimator's internal registers as initial loading values include one error, this chip with error can be corrected through multiple local PN code generators to achieve high-speed acquisition performance. Hamming distance between regenerated local PN codes from the proposed system and received PN code is compared with given threshold to choose a possible correct path and to declare success of the code acquisition. Using signal flow graph, average acquisition time that depends on detection and false alarm probability is calculated. By modifying generally used matched filter structure for PN code acquisition, the proposed system provides flexible structure and rapid acquisition process.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.5
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• pp.2271-2280
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• 2013

This study is a descriptive research carried out to investigate the knowledge, confidence and attitude on cardiopulmonary resuscitation(CPR) of university students studying health care and figured out the factors affects their attitudes on CPR. 516 health-care university students were informed with the agreement of this study. The data were analyzed with t-test, one-way ANOVA, Pearson's correlation coefficient and Multiple linear regression were used. There were significant positive correlations between the attitude and knowledge(r=.269, p<.001) and between the attitude and confidence (r=.620, p<.001) on CPR. It was found that the influential factors for the attitude on CPR include confidence, gender, knowledge, personality, perception, education experience in CPR, experiences in medical service and the reason for choosing the subject and their persuasive power was 49%. Programs and educations enhancing knowledge and positive attitude on CPR is needed, and there needs to be developing in a proactive manner.

• Archives of design research
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• v.15 no.4
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• pp.327-336
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• 2002

This paper is intended to help cool-skin-colored people to choose suitable clothing colors confidently and look well-dressed and to make positive self-images. A pseudo-experimental method has made it possible to analyze the visual evaluations of clothing color images for cool-skin-colored people and obtain the following results. 1. Reddish colors of vivid tone for doffing give positive images and those of dull and dark tone, negative ones. 2. Yellowish colors of vivid and bright tone for doffing show positive images and those of dull and dark tone, negative ones. Cool yellow of light tone proves to contribute to a well-looking image. 3. Warm green of vivid and deep tone, and cool green of vivid tone for clothing present positive images. 4. Warm blue of vivid and deep tone, and cool blue of vivid and bright lone make positive images. Either blue with dull tone gives a negative image. 5. Purple colors whose tone is vivid, deep and light contribute to positive images, and those of dull tone, negative ones.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2017.05a
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• pp.139-139
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• 2017

최근 환경오염 문제로 인한 연비 규제 강화 속도가 빨라지고 있으며 이에 따른 연비 향상 기술이 크게 대두 되고 있다. 연비 향상 기술 중 경량화 방안소재로 알루미늄(Al), 마그네슘(Mg) 등의 비철금속을 주로 사용하고 있으며, 이중 알루미늄은 다른 경량화 금속소재보다 우수한 경쟁력을 가지고 있다. 하지만 경제적인 측면에서 철 대비 비용적인 어려움을 가지고 있고 용접성이 떨어지기 때문에, 자동차 부품의 일부만 알루미늄 소재를 선택하여 사용하고 있는 실정이며 알루미늄의 높은 이온화 경향으로 인해 기존 자동차 철강 소재와 접촉 시 쉽게 부식되는 단점을 가지고 있다. 이러한 문제점을 해결하기 위해서는 알루미늄의 금속원소를 첨가하는 연구가 지속적으로 개발 되고 있다. 알루미늄 합금에서 마그네슘의 첨가는 좋은 용접성과 내식성, 강도를 향상시킨다. 하지만 3%이상의 마그네슘 첨가는 입계에 ${\beta}(Al_xMg_y)$석출상이 석출되게 되며, 입계에 연속적으로 형성된 ${\beta}(Al_xMg_y)$석출상은 응력 부식 균열 (Stress corrsion cracking)과 입계 부식(Intergranular corrosion)을 야기하는 결과를 가져온다고 알려져 있다. 이 문제를 해결하기 위해 Al 5000계열 합금의 Zn의 첨가를 통해 ${\tau}(Al_xMg_yZn_z)$을 입계에 석출시켜서 입계에 ${\beta}(Al_xMg_y)$상의 석출을 방지함으로써 내식성을 향상시키거나 Al 5000계열 합금의 열처리를 통해 ${\beta}(Al_xMg_y)$석출상을 고용시킴으로써 응력부식균열의 발생을 억제하는 연구도 있다. 하지만 열처리 후 Polarization test를 이용한 내식성 연구는 잘 안 알려져 있다. 따라서 이번 연구에서는 Al5000계열의 주조한 합금을 DSC분석을 통하여 ${\beta}(Al_xMg_y)$석출상의 고용 온도가 약 $470^{\circ}C$라는 것을 확인한 후, 실온에서 $100^{\circ}C/hr$으로 가열하고 조건에 따라 $450^{\circ}C$에서 3시간, 6시간, 12시간, 24시간, 30시간 항온 유지시킨 후 공냉을 진행하였다. 열처리를 마친 시편은 에폭시를 이용하여 마운팅 하였으며, 시편표면을 2000#까지 연마 후 증류수로 세척한 다음 질소를 이용하여 건조 후 분극 시험을 진행하였다. 3.5wt% NaCl 용액에서 분극 곡선을 통해 부식거동을 확인한 결과 24시간까지 시간이 증가 할수록 내식성이 우수해지는 것을 확인하였으며, 추가적으로 조직사진, SEM & EDS 분석과 XRD, TEM 분석을 통해 내식성은 입계에 존재하는 Mg의 조성이 감소하게 되면 내식성이 향상되는 것을 관찰하였다.

• Journal of the Korea Convergence Society
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• v.6 no.5
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• pp.91-98
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• 2015

Recent domestic university has emerged need to convergence education. Health related department College students must deal with a lot of exams. The test anxiety can cause physiological and psychological problems. To solve this problem, it is necessary examine the relationship between test anxiety and self-esteem. This study Health related department College students conducted questionnaire survey of 301 students. In general the overall average is 2.98 according to the characteristics of self-esteem and gender, boys, if older, the older the more self-esteem was higher. Test anxiety of the general characteristics showed little higher this year. Test anxiety is higher self-esteem was low. The effect o the general characteristics and test anxiety self-esteem, in the case of boys, seniors, if I choose this self-esteem was higher, the higher the anxiety test were analyzed by low self-esteem. Therefore, need to a systematic curriculum approach and academic environment.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2018.06a
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• pp.30-30
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• 2018

스마트 도금공장을 구축하기 위해서는 도금액 내부의 화학 물질 농도 변화를 측정할 수 있는 화학 센서 기술이 필수적으로 요구된다. 와트욕은 대표적인 고속 니켈 도금액 중 하나로 기본적으로 황산니켈, 염화니켈, 보릭산의 염과 함께 케리어(type-1 광택제), 광택제(type 2-광택제), 응력 제어제 등의 유기 첨가제로 구성되어 있다. 이러한 유기 첨가제는 전차된 니켈층의 두께 균일도, 조도, 미세 구조, 내부 응력 등 다양한 특성을 제어하며, 정밀한 농도 관리가 필수적으로 요구되나, 분석 기술의 부재로 인하여 지금까지도 대부분의 액관리는 할셀법이나 작업자의 경험에 의존하고 있다. Cyclic voltammetry stripping(CVS) 방법은 전기화학 분석 과정에서 나타나는 첨가제의 가속, 감속 특성 등과 여기에 수반되는 stripping peak의 변화를 이용하여 개별 첨가제의 농도를 측정하는 방법이며, 지금까지 인쇄회로기판의 비아필 공정, 전해 동박 제조, 반도체 배선 등 구리도금 산업 전반에 걸쳐 첨가제 관리에 효과적으로 적용되고 있다. 그러나 수소 발생으로 인한 stripping 효율 문제로 인하여 니켈, 주석, 아연 등 표준 환원 전위가 높은 금속 도금액 내부 첨가제 농도 측정은 아직 어려운 상황이다. 본 연구에서는 이 문제를 극복하기 위해 염소를 과량 첨가한 구리 도금액을 CVS 분석의 base 용액으로 이용하여 니켈 도금액 내부 여러 광택제 (polyetylene glycol(PEG) 계열, thiourea 계열, 2-butyne-1,4-diol 등) 농도를 측정하는 법을 제시하였다. 제시된 방법은 CVS 분석 과정에서 구리-염소 사이의 상호 작용으로 인해 생성되는 3가지 stripping peak의 상대적인 크기 변화가 첨가제 농도에 따라 영향을 받는다는 사실에 기반하였다. 본 연구에서는 여기에 관한 원인에 대해 고찰하였으며, 제시된 방법을 통해 광택제 계열 첨가제 농도 측정을 선택적으로 할 수 있다는 것을 증명하였다.

• Journal of Practical Engineering Education
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• v.10 no.2
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• pp.131-137
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• 2018

In this study, the results of the IPP system were examined and the direction of development was suggested from the viewpoint of students participating in long-term field practice. The participating students recognized that the IPP system was helpful in enhancing their major competence, non-major competence, and job competitiveness. On the other hand, satisfaction with practicing companies and operating universities remains at a normal level for three years, and the intention to recommend IPP system to junior colleagues and colleagues has been consistently high for three years. The more consistent the desired job and the IPP participation job, the greater the positive perception of the IPP effect and the greater the recommendation intention of IPP system.

• Korean Journal of Ecology and Environment
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• v.44 no.3
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• pp.292-302
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• 2011

The Lake Sihwa watershed includes industrial, urban, and rural areas simultaneously. In this study, we analyzed the characteristics of dissolved organic matter (DOM) in spatial-temporal runoff patterns at representative sites having different land use in the watershed of Lake Sihwa. The result of synchronous and 3D-EEMs(3-Dimensional Excitation Emission Matrix Spectroscopy) analysis in 4TG (industrial area), fluorescence distribution and variation clearly appeared in the Fulvic-like fluorescence (FLF) and Humic-like fluorescence (HLF) regions along with the Protein-like fluorescence (PLF) region. A characteristic that Peak A (HLF) region fluorescence intensity did not decrease and the HLF region of fluorescence intensity and spatial-temporal changes clearly appeared during rainfall in AS (urban area). The results of fluorescence analysis in MS did not show great changes in PLF and FLF while showing that fluorescence intensity changes over time in the Terrestrial-like fluorescence (THLF) region increased greatly. In conclusion, our results showed significant differences in the runoff characteristics of DOM particularly in industrial, urban and rural area, and these differences should be considered for the efficient controlling of DOM in the watershed.

• Journal of the Korean Applied Science and Technology
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• v.35 no.2
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• pp.454-462
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• 2018

This study is a descriptive research study to examine influence of major satisfaction and career maturity on the job-seeking stress of nursing and public health university students. This study surveyed 410 nursing and public health university students from 3 schools of G-city from September 26 to October 31, 2017. The data were analyzed by descriptive statistics, ANOVA, ANCOVA, Pearson correlation coefficients, and multiple regression. The study results showed a significant difference in major satisfaction (F=9.856, p<.001) and career maturity (F=6.005, p=.001) according to major choice motives. The student GPAs were also found to be significantly different from career maturity (F=2.755, p=.042) and job-seeking stress (F=3.503, p=.016). In addition, the TOEIC score was significantly different from major satisfaction (F=4.514, p=.004). Job-seeking stress was positively correlated with major satisfaction (r=-.314, p<.001) and career maturity (r=-.514, p<.001). The factors affecting job-seeking stress were in the order of major satisfaction (${\beta}=-.125$, p=.007) and career maturity (${\beta}=-.459$, p<.001). Based on the results, two proposals are recommended in order to reduce the job-seeking stress of nursing and public health university students. It is necessary to prepare major guidance programs suitable to the characteristics of each department from the lower grades and to provide the students with career guidance accordingly.