대나무 활성탄의 산 개질이 납과 구리 이온의 흡착에 미치는 영향

이명은ㆍ정재우(Myoung Eun LeeㆍJae Woo Chung) 유기성자원학회 2016 유기물자원화 Vol.24 No.1

질산과 염산에 의한 대나무활성탄(bamboo-based activated carbon, BAC)의 개질이 Pb(Ⅱ)와 Cu(Ⅱ)의 흡착특성에 미치는 영향을 규명하기 위해 회분식 흡착실험을 수행하였다. 산 개질에 의해 BAC의 탄소함량은 감소하고 산소함량은 증가하며 pH는 감소하는 것으로 나타났다. 염산에 의한 개질은 BAC에 뚜렷한 표면 작용기를 첨가시키지 않았으나 질산에 의한 개질은 카르복실기와 OH 작용기를 첨가시키는 것으로 나타났다. BAC와 산으로 개질된 BAC의 중금속 이온 흡착속도는 2차 속도모델에 의해 적절하게 설명될 수 있는 것으로 나타나 흡착반응의 속도가 물리적 흡착보다는 흡착제와 금속이온들 사이의 전자들의 공유나 교환을 포함하는 화학적 흡착에 의해 결정되는 것으로 나타났다. 실험에 사용된 모든 흡착소재의 등온흡착특성은 Langmuir와 Freundlich 모델에 의해 적절하게 설명될 수 있으며 BAC의 염산에 의한 개질은 중금속 이온의 흡착용량에 큰 영향을 미치지 않으나 표면작용기를 첨가시킨 질산에 의한 개질은 Pb(Ⅱ)와 Cu(Ⅱ)의 흡착용량을 각각 36.0%와 27.3% 증가시키는 것으로 나타났다. Effects of acid (HNO3 and HCl) modification on the adsorption properties of Pb(Ⅱ) and Cu(Ⅱ) onto bamboo-based activated carbon (BAC) were investigated through a series of batch experiments. The carbon content increased and oxygen content decreased with acid treatment. HNO3 induced carboxylic acids and hydroxyl functional groups while HCl added no functional group onto BAC. The pseudo-second order model better described the kinetics of Pb(Ⅱ) and Cu(Ⅱ) adsorption onto experimented adsorbents, indicating that the rate-limiting step of the heavy metal sorption is chemical sorption involving valency forces through sharing or exchange of electrons between the adsorbate and the adsorbent. The equilibrium sorption data followed both Langmuir and Freundlich isotherm models. The adsorption capacities of BAC were affected by the surface functional groups added by acid modification. The adsorption capacities were enhanced up to 36.0% and 27.3% for Pb(Ⅱ) and Cu(Ⅱ), respectively by the HNO3 modification, however, negligibly affected by HCl.

바이오 휘드백 훈련을 통한 이완요법이 생리통 및 스트레스반응경감에 미치는 영향

이소우,김금순,최명애,이명선 서울대학교 간호대학 간호과학연구소 1999 간호학 논문집 Vol.13 No.1

The purpose of this study was to investigate the effects of a 4-week relaxation therapy using biofeedback on menstrual pain and stress for 35 sophomore and junior baccalaureate nursing students. A quasi-experimental pretest-posttest control group design was used. The relaxation therapy group included training sessions using respiration therapy augmented with biofeedback techniques for self-relaxation. A significant reduction of pain (P<.05) on the 1st and 2nd day of menstruation was reported on the visual analogue scale by the experimental groups, while that the control groups remained relatively unchanged. Also a significant reduction of pain (P<.05) was reported on the delivery pain scale by the experimental groups on the 2nd day of menstruation, while that of the control groups remained unchanged. However, there were no significant differences of pain on the 3rd and 4th day of menstruation between the two groups. A significant reduction of state of anxiety (P<0.5) was reported by experimental groups, while that of the control groups remained relatively unchanged. There were no significant changes in stress measured by the symptom of stress. The results of the study support the benefits of relaxation therapy using biofeedback on pain relief and stress.

殘留應力이 스프링破斷에 미치는 影響

李道衡,金達羽,金明元 淸州大學校 1982 論文集 Vol.15 No.2

The effect of residual stress on the fracture of a coil spring has been examined by measuring residual stress with X-ray stress analyzer. The scanning electron micrographs of the stress rupture specimen have also been examined. The results showed that this failure began at the inclusions where the largest residual stress was measured. Inclusion was acted as a stress concentrator and crack initiator in this fatigue fracture.

흰 민들레 추출물의 항산화능 및 항균활성

박명수, 라만, 임우종, 김기윤, 우성만, 이선미, 사동민 忠北大學校 農業科學硏究所 2011 農業科學硏究 Vol.27 No.4

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폐 내 병변으로 인한 소아 급성 호흡부전의 원인 질환과 예후

이혜영,박지숙,최희라,서지현,김점수,임재영,최명범,박찬후,우향옥,윤희상 대한소아과학회 2004 小兒科 Vol.47 No.5

인터넷 벤처비즈니스 평가체계에 관한 연구

이명호,이우형,손성혁 한국경영과학회 2001 韓國經營科學會誌 Vol.26 No.3

Riding on the wave of the information technology revolution, a slew of internet venture businesses(IVB) came into being. Hence, one of the recent deveopments in Korean capital market has been the proliferation of IVB, which is in accordance with the worldwide trend of 'new economy'. Although the fair valuation is crucial for the nourishment of IVB. It is difficult to apply traditional valuation methods to these firms without reservation. It is due to the facts that most venture firms have little records of performance, grow unprecedently fast, and have highly uncertain future. The main purpose of this study is to suggest performance evaluation system of IVB and to develop KPI(Key Performance Indicators). Our empirical study is based upon Kaplan & Norton's Balance Scorecard (BSC) approach. Specifically, our research has been conducted by the following two subsequent procedures: Firstly, seven internet venture firms have been selected and their executives have been interviewed by FGI(Focus Group Interview) method. Based upon these results, performance indicators been developed. Secondly, by using the above mentioned BSC items(i.e., financial perspective, customer perspective, internal perspective and innovation & learning perspective), questionnaires have been costructed and sent to IVB through e-mail as well as over the Fax. Among the collected 110 samples, reliable 106 samples have been used to build BSC model and to draw our conclusion. In the future study. It would be much better to consider the role of strategy in IVB and the causal relationships among Key Performance Indicators of BSC.

산업용 6관절 로봇의 원격제어를 위한 실시간 병렬데이터통신 인터페이스

최명환,이우원 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.A

This paper presents the development of the I/O Interface for the real time parallel data communication between controller of a six-axis industrial robot(CRS -A460) and an external computer. The proposed I/O Interface consists of the hardware I/O interface and the software that is downloaded to the robot controller and executed by the controller operating system. The constitution of the digital I/O Port for CRS-A460 robot controller and the digital I/O board for IBM-PC are presented as well as the Process Control Program of the robot controller. The developed protocol for the parallel data communication is described. The data communication is tested, and the performance is analysed. In particular, it is shown that the real-time constraint of the robot controller process is satisfied.

대학생들의 자살관련행동에 관한 연구

노명선,전홍진,이해우,이효정,한성구,함봉진 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.1

Objectives : This study evaluated the prevalence of suicide-related behaviors (suicidal ideation, plan and attempt) and the status of depression, anxiety and function in college students. Methods : A cross-sectional study was completed to a sample of 880 students with the self-administered form of Korean version of the Mini International Neuropsychiathc Interview (K-MINI), Beck Depression Inventory (BDI) and Beck Anxiety Inventory (BAI). Results : Estimated lifetime prevalence of suicidal ideation was 39.2%, that of suicidal plan was 4.7% and that of suicidal attempt was 3.0%. Students with any suicide-related behaviors showed higher lifetime prevalence of major and minor depression, higher BDI and BAI scores, and poor intemersonal relationship, adaptation to college life and physical health compared to the students with no suicide-related behaviors. The average points of grades during their college life were not significantly different according to kinds of suicide-related behaviors they expehenced (F=0.39, P=0.82). 96% of suicidal attempters did not use mental health services. Conclusion : Results suggest that a high proportion of college students experience suicide-related behaviors. The Stu-dents who had experienced suicide-related behaviors showed higher depression and anxiety and poorer function compared to students with no suicide-related behaviors. Most of suicidal attempters, however, did not use mental health service Establishing campus mental health system is necessary to early detect mental health problems and to prevent suicide of college students.

수치해법에 의한 Dolph-Chebyshev배열 안테나의 전류 계산에 관한 연구

송우영,이명호 淸州大學校 1985 論文集 Vol.18 No.2

This paper shows a method for calculating the currents of Dolph-Chebyshev array antennas using the first order simultaneous equations by numerical methods. In order to solve the first order simultaneous equations, Gauss-Jordan Elimination with Scaled Column Pivoting method is used. And we derive the relations between matrix elements and array factor. As a results, this method is a useful method for calculating the currents of Dolph-Chebyshev array antennas.

좌심실 전동순환 보조장치에 관한 연구

김명남,이정우,장봉현,조진호 경북대학교 의학연구소 2000 경북대학교병원의학연구소논문집 Vol.4 No.1

본 논문에서는 정상류형 혈액 펌프의 일종인 축류형 혈액 펌프를 이용하여 혈액 펌프 시스템을 설계하였다. 이 시스템은 혈액 펌프, 신호 획득부, 인터페이스부, 신호 처리부로 구성되어 있고, 혈압과 심박수를 이용하여 혈압과 혈류량을 적절히 제어함으로써 좌심실의 기능을 보조할 목적으로 연구되었다. 전동 펌프가 회전할 때 생체내의 순환조건에 알맞도록 혈액 펌프의 회전수, 혈액 펌프에 걸리는 부하와 압력 정보를 적용하여 실험식을 만들어 제어에 이용하였으며 설계 제작된 모의 순환장치로써 실험한 결과 모의 혈관 내에서 적절한 혈압과 혈류의 제어가 가능하였고, 혈구의 변화량 실험 결과는 임시의 목적으로 사용가능함을 알 수 있었다. This paper outlines the development of a non-pulsatile axial flow type blood pump control system. By utilizing blood pressure and heart rate, this system can assist the left ventricle in controlling blood pressure and blood volume. The system is comprised of a blood pump, signal sensor, signal interface, and signal-processing component. A control algorithm is also proposed which can control non-pulsatile, continuous blood flow in the human circulatory system. To facilitate the control required fur non-pulsatile blood pump in a physiological system, an experimental control rule was developed utilizing ECG and blood pressure data, both of which are easily detectable variables in the bods. The system was then tested using a mock-up circulation system and we found that it is possible that this systems could be temporarily used in clinic.