Catalytic oxidation of hydrogen at nanocrystalline palladium surfaces

Oh, Chanick,Hong, Kwan Soo,Lee, SangGap,Park, Chung-hyun,Yu, Insuk IOP Pub 2006 Journal of physics, an Institute of Physics journa Vol.18 No.13

<P>We studied hydrogen adsorption onto the oxidized nano-palladium surface using <SUP>1</SUP>H NMR. In the α phase, the incoming hydrogen molecules dissociate and form OH<SUB>ad</SUB>. We confirm that the <img SRC='http://ej.iop.org/images/0953-8984/18/13/001/cm210477ieqn1.gif' ALIGN='MIDDLE' ALT='\mathrm {OH_{ad}} \rightarrow \mathrm {H_2O}(\uparrow) '/> transformation occurs during the α–β phase transition by observing a decrease in OH<SUB>ad</SUB> resonance intensity.</P>

금연행위와 관련된 개인적 특성 및 경험과 인지 및 감정 사이의 상호관련성 분석

오현수 성인간호학회 2001 성인간호학회지 Vol.13 No.3

The Purpose of the study was to examine if individual characteristics and experiences related to smoking behavior identified from the literature were significantly associated with behavior-specific cognitions and affect in the same way as presented in Pender's Revised Health Promotion Model(Pender, 1996). The subjects selected for this study were 400 college students enrolled in more than 10 colleges located in Seoul and Kyunggi-Inchon province. According to the study results, personal factors (i.e.. perceived health status, the past history of disease, and symptoms related to smoking) and related behavior (i.e., the degree of alcohol consumption, and exercise) are significantly associated with behavior-specific cognitions and affect (i.e., perceived barriers to smoking cessation, perceived self-efficacy, and perceived benefits of smoking cessation). The canonical correlation between two groups of variables was .59. and it turned out to be statistically significant. Thirty-four percent of variance of the relationship between two group of variables was explained by two canonical variates which turned out to be significant in the study results. The result could be interpreted from the view of psycho-social area as follows : overall, this study includes important variables which explain the association between two groups of variables.

감귤류 종자 추출물의 N-nitrosodimethylamine 생성억제에 관한 연구

오혁수,안용석,나임순,오명철,오창경,김수현 한국조리과학회 2003 한국식품조리과학회지 Vol.19 No.5

The effect of inhibition on N-nitrosodimethylamine (NDMA) formation by methanol extracts from 6 kinds of citrus seed (Citrus sunki, Citrus natsudaidai, Citrus suleata, Citrus tangerina, Citrus grandis and Citrus obovoidea) were investigated. The contents of moisture, crude protein, crude fat, carbohydrate, ash, flavonoid and totat phenol in citrus seeds were 4~6, l1~15, 32~46, 22~45, 2~4%, 12~24mg% and 53~133㎎%, respectively. The solid contents and yield of citrus seed extracts were 0.8~1.0 and 0.7~1.1%, respectively. Nitrite-scavenging activity by methanol extracts from citrus seeds increased with increasing extract dosage. Furthermore, the nitrite scavenging activity was pH dependent being the highest at pH 1.2 (42.7~96.9%) and the lowest at pH 6.0 (19.9~62.6%). Scavenging effects of nitrite by reaction time showed high effects under 3hr reaction time. The inhibition effect of NDMA formation by the citrus seed was strengthened as the amount of extract increased. The inhibition rate of methanol extracts from citrus seeds on NDMA formation showed 1.2~39.8%, 21.3~60.1% and 47.4~94.0%, according to add 1, 3 and 5㎖, respectively. Therefore, the inhibition effect of NDMA formation by the citrus seed was strengthened as the concentration of extract increased.

근사 역시스템을 이용한 비최소위상플랜트의 적응제어기 설계

오현철,김윤상,안두수 成均館大學校 科學技術硏究所 1998 論文集 Vol.49 No.1

This paper presents approach to the adaptive control of nonminimum-phase continuoustime systems. The usual model reference adaptive control methods cannot be applied to nonminimum-phase systems, because unstable pole-zero cancellations cannot be avoided. In this paper, it is shown that pole-zero cancellations can he avoided by using approximate inverse systems. The least square approximation is used to find these approximate inverse systems.

장루 보유자의 생활 만족도 조사

서현석,이석환,고영관,오수명,윤충,주흥재,이기형 대한대장항문학회 1998 Annals of Coloproctolgy Vol.14 No.3

김치의 N-Nitrosamine 오염

오창경,오명철,송대진,김수현,Hotkchiss, J. H. 濟州大學校工科大學産業技術硏究所 1999 尖端技術硏究所論文集 Vol.10 No.1

김치 발효중 Ν-nitrosamine의 함량 변화 및 오염 출처에 대한 연구를 수행한 결과, 식품에서 흔히 발견되는 NDMA와 NDEA가 검출되지 않은 반면, 13종의 미확인 Ν-nitrosamine이 검출되었으며, 이들은 모두 Ν-nitrosamines으로 동정되었다. 이들은 주로 배추와 일부 멸치 젓갈에서 유래된 것이었다. 김치 발효 초기에는 배추에서 유래된 Ν-nitrosamine들이 감소되었으며, 발효 말기에는 일부 Ν-nitrosamine이 미량 증가되었다. Changes in Ν-nitrosamines during Kimchi fermentation were investigated. Thirteen unknown Ν-nitrosamines were detected during Kimchi fermentation, but Ν-nitrosaminethylamine(NDMA) and Ν-nitrosaminethylamine(NDEA) were not. Most of these Ν-nitrosamines were originated from chinese cabbage and some of from fermented anchovy sauce. The content of Ν-nitrosamines decreased remarkably at the initial stage of fermentation, but increased slightly at the final stage.

영지버섯 생장점 단백다당체 GLB의 대식세포 활성화 효과

오정연,조경주,정수현,김진향,Lillehoj, H.S.,정경수 충남대학교 약학대학 의약품개발연구소 1998 藥學論文集 Vol.14 No.-

In the previous study we described the antitumor activity of GLB. a protein-polysaccharide fraction of the growing tips of Ganoderma lucidum, against sarcoma 180 solid tumor in ICR mice. In this study we investigated the stimulatory activity of GLB on macrophages. When analyzed using a flow cytometer. GLB (100 ㎍/㎖) was found to increase the phagocytic activity of the BALB/c mouse peritoneal macrophages as well as chicken macrophage BM2CL cells against FTTC-labeled C. albicans by 55.2% and 21.2%, respectively. GLB also increased the spreading and the expression of MHC class Ⅱ molecules of BM2CL cells as well as the mouse peritoneal macrophages. From these results, it is clear that GLB is a strong stimulator to the macrophages.

농구 자유투 동작의 운동학적 분석

오정환,박현수 忠南大學校體育科學硏究所 2003 體育科學硏究誌 Vol.21 No.1

The purpose of this study is to provide the characteristics of the free throw motion about the middle school students and scientific data indispensible to die technical instructions for die basketball. The analytic methods of the 3-dimensional images for the free throw motions was used and the subjects of the this study were seven male basketball players and seven male non-players. Using the KWON3D Motion Analysis Package(version 3.0) the kinematic variables(time, displacement, velocity, angle) were measured and analysed. The conclusions were as follows ; 1) The elapsed time of shooting phase was measured to be 0.309 seconds for the player group, 0.283 seconds for die non-player group. It was shown that the elapsed time of shooting phase for the player is longer than that of the non-player group. 2) The center of gravity displacement was measured to be 108.72cm for the player group, 111.61cm for die non-player group. It was shown that die center of gravity displacement for the player is larger than that of the non-player group. 3) It was shown that the velocity of rigid body for the player group is faster than that of the non-player group and the velocity of center of gravity for die non-player group is faster than that of the player group. In the case of analysing the forearm and upperarm, the player group was faster in L1, the non-player group was faster in L2 4) The ball release velocity was measured to be 659.99cm/sec for the player group and 665.11cm/sec for the non-player group and it was made no meaning difference both the two groups. 5) The angle of wrist joint was measured to be 138.37°, 121.04° in L1 and 189.93°, 184.62° in L2. In L1, the wrist joint of the non-player group was twisted and in L2 the wrist joint of the player group was extended. In the case of analysing the angle of elbow joint and shoulder joint, it was made no meaning difference both the two groups. The body's front and rear inclination angle was measured to be 171.06°in L1 and 174.82°in L2. It was shown that the body's front and rear inclination angle for the player group is larger than that for the non-player group. 6) The ball projection angle is measured to be 56.41°for the player group and 56.87° for the non-player group and it was made no difference both the two groups.

Laguerre 모델을 이용한 시스템 근사화

오현철,김윤상,안두수 成均館大學校 科學技術硏究所 1998 論文集 Vol.49 No.1

This paper presents an efficient method which can approximate unknow systems using Laguerre models. This method is to approximate system from only input-output information, which can exclude additional procedure for system description. and thus reduce the required computational burden. The proposed method has the advantage that an unknown system can be modelled without structural knowledge and assumption about the true model order and time delay.

금연과 관련된 개인의 특성, 경험, 그리고 인지ㆍ감정요인들이 금연행동 계획수립 및 실천에 미치는 영향 분석 : Pender의 개정된 건강증진 모형 적용

오현수 성인간호학회 2001 성인간호학회지 Vol.13 No.2

This stuffy was conducted to examine if the revised HPM was appropriate to explain smoking quitting behavior A convenience sample of 400 college students enrolled in the universities located in Seoul and Kyunggi-Inchon province was selected. According to the study results. smoking-specific cognitions and affect included in the study could significantly explain commitment to a plan to quit smoking which was one of the behavioral outcomes in the revised HPM. The study result showed that among predictors, smoking-rebated affect, Perceived benefit of quitting smoking, and perceived self-efficacy significantly explained commitment to a plan to quit smoking, but perceived barriers and interpersonal influences did not. The model for smoking quitting behavior formulated with smoking-specific cognitions and affect was statistically significant and the model explained 48 percent of variance in smoking quitting behavior. More specifically, it was shown that among smoking-specific cognitions and affect, only smoking-related affect, interpersonal influences, and perceived self-efficacy were the significant predictors to explain smoking quitting behavior. Smoking-related affect was the most important variable to explain smoking quitting behavior, followed by peiceived self-efficacy. However, the influence of commitment to a plan to quit smoking on smoking quitting behavior was not statistically significant. Lastly, the model for smoking quitting behavior formulated with individual characteristics and experiences could explain 13 percent of the variance in behavior to quit smoking. Although the model is statistically significant, only the number of influence on behavior to quit smoking, whole the remaining variables did not.