Improved reversible redox cycles on MTiOx (M=Fe, Co, Ni, and Cu) particles afforded by rapid and stable oxygen carrier capacity for use in chemical looping combustion of methane

Kwak, B.S.,Park, N.K.,Ryu, S.O.,Baek, J.I.,Ryu, H.J.,Kang, M. Elsevier 2017 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.309 No.-

In this study, rutile TiO<SUB>2</SUB> particles (MTiOx) incorporating 3d-metals, with their electrons more than half-filled, are synthesized for use in the chemical looping combustion of methane. The specific structures are obtained by doping the M-sites with Fe, Co, Ni, and Cu (FeTiOx, CoTiOx, NiTiOx, and CuTiOx), and they have the same M/Ti molar ratio of 1.0. XRD, SEM, CH<SUB>4</SUB>-TPD, TGA, and BET techniques were used to characterize the prepared materials. The XRD results confirmed that all of the prepared materials possessed pure hexagonal phases in the case of Co1Ti1Ox and Ni1Ti1Ox and mixed formations composed of metal oxides and rutile TiO<SUB>2</SUB> in the case of Fe1Ti1Ox and Cu1Ti1Ox. The CH<SUB>4</SUB>-TPD and H<SUB>2</SUB>-TPR analyses showed that the highest adsorption is obtained on CuTiOx, in particular on Cu1.5Ti1Ox. The oxygen carrier capacities of the samples were measured in H<SUB>2</SUB> (FR)/air (AR) and CH<SUB>4</SUB>-CO<SUB>2</SUB> (FR)/air (AR) redox systems at 850<SUP>o</SUP>C using TGA analysis. Their variability was shown to be associated with the different doping elements and doping concentrations. In particular, the Cu1.5Ti1Ox material in the CH<SUB>4</SUB>-CO<SUB>2</SUB> (FR)/air (AR) redox system exhibits oxygen uncoupling behaviour, leading to improved capture and release of oxygen compared to the other materials.

유효 구동력 개념을 이용한 고상 비정질화 반응의 예측에 관한 연구

곽준섭(J. S. Kwak),지응준(E. J. Chi),최정동(J. D. Choi),박상욱(S. W. Park),소명기(M. K. So),이성만(S. M. Lee),백홍구(H. K. Baik) 한국진공학회(ASCT) 1993 Applied Science and Convergence Technology Vol.2 No.1

이원계 박막확산쌍에서 열처리 방법에 의한 고상 비정질화 반응의 경향성을 예측하기 위하여 유효 구동력 개념을 제시하였다. 고상 비정질화 반응은 두 원소의 물리적 혼합물과 비정질상간의 최대 자유에너지차로 주어지는 열역학적 구동력(ΔG_(max))과 확산원소의 원자반경에 대한 기지의 유효 침입형자리 반경의 비로 주어지는 구조적 요소(R_(m/d))가 충족될 때 일어나는 빠른 확산에 의하여 발생된다고 고찰하고, 유효 구동력 기준을 이용하여 금속/금속계 뿐만아니라 금속/실리콘 계의 고상반응에 의한 비정질상 생성 경향성을 예측하고 실험결과들과 비교하여 잘 적용됨을 보였다. 또한, 유효 구동력 기준이 금속/실리콘 계에서 비정질상의 임계 성장두께 경향성의 예측에도 잘 적용됨을 보였다. It is proposed that formation and growth of amorphous interlayer through solid state amorphizing reaction can be predicted by the concept of effective driving force. The effective driving force consists of two factors; i) the thermodynamic driving force given by maximum free energy difference between physical mixture of binary elements and amorphous interlayer (ΔG_(max)) and ii) the structural factor given by a ratio between effective radius of interstitial site in host matrix and atomic radius of diffusing species (R_(m/d)). It is shown that the the criterion of effective driving force is successfully applied in the prediction of the formation of amorphous interlayer in metal/silicon systems as well as that of metal/metal systems from the comparison of experimental data. In addition, the concept of effective driving force can be well applied to predict the growth tendency of amorphous interlayer in metal/silicon systems.

사망시간

곽정식 大韓法醫學會 2000 대한법의학회지 Vol.24 No.2

Estimation of the time of death is very important in medical and legal, fields or criminal and civil litigation. However, determination of the time of death is difficult in practice of medicalegal investigation. The auther briefly reviewed definition of death, significance of time of death, determination of time of death, and estimation of postmortem time since death by postmortem changes.

Idiopathic Respiratory Distress Syndrome의 2例

郭景魯,金顯宇,李敏子,李謹洙 金原出版 1970 小兒科 Vol.11 No.7

육계분 혐기 또는 퇴적 발효 사료 제조 시 당밀 첨가 및 펠렛화가 사료영양적 가치 및 사료 적응기의 한우 기호성 개선에 미치는 영향

곽완섭,박종문 한국동물자원과학회 2003 한국축산학회지 Vol.45 No.1

본 연구는 육계분 혐기 또는 퇴적 발효사료 제조 시의 적정 당밀 첨가 수준을 도출하고, 발효 전·후의 영양적 및 발효 성상의 변화를 구명하고, 펠렛 처리 효과를 평가하며, 그리고 기존의 한우 사양 체계에서의 당밀 또는 펠렛 처리된 육계분 발효사료 급여 시 한우에 의한 기호성 개선 통한 적응기간 단축 효과를 평가하고자 실시되었다. 육계분의 혐기발효 시 경제적이고도 효과적으로 혐기발효를 일으키는 당밀 적정 첨가 수준은 5%인 것으로 사료되었다. 육계분의 혐기 또는 퇴적발효 시 당밀 5% 첨가는 발효 성상을 향시시키나(P<0.05), 화학적 성분과 in vitro 영양소 소화율에는 현저한 영향을 미치지 않았다. 육계분 퇴적발효사료의 펠렛화는 밀도(중량/부피)를 3배정도 증가시키고, 수분을 현저히(P<0.05) 증발시켰으나, 약간의 유기물 감소(P<0.05) 현상을 보였다. 육계분 발효사료를 펠렛 처리 또는 당밀 첨가는 한우에 의한 기호성을 뚜렷하게 향상시켰으며, 결과적으로 한우의 이들 사료에 대한 적응기간을 반 정도(8∼9일)로 단축시켰다. 종합적으로 육계분 발효사료 제조 시 당밀 첨가 또는 펠렛 처리는 사료영양적 가치를 유지하면서 적응기간 동안의 한우 기호성을 현저하게 개선시키는 효과가 있었다. This study was conducted in order to determine a proper level of molasses addition through the analysis of changes in appearance, nutritive and silage parameters before and after ensiling or deepstacking of broiler litter, to evaluate the effect of pelleting processed broiler litter and to develop methods to enhance palatability of broiler litter and reduce the adjustment period by 'Hanwoo' steers. Molasses addition was effective in ensiling and deepstacking of broiler litter and the proper addition level was about 5%. Changes in nutritive values of broiler litter by ensiling and deepstacking with or without molasses treatment were not great. Adding 5% molasses at deepstacking of broiler litter did not affect(P<0.05) in vitro digestion of dry matter and organic matter. Pelleing of broiler litter resulted in significant(P<0.05) moisture evaporation, organic matter reduction and nearly threefold increase of bulk density. Pelleting or molasses addition of broiler litter improved palatability by 'Hanwoo' steers and reduced the adjustment period by half(8~9 d).

대학생의 암 예방 수칙에 대한 인식 및 실천행태 연구

곽지연,김서연,김자영,이혜연,정문정,진수현,천선우,하소현,한희진,양숙자,김지연 이화여자대학교 간호과학대학 2016 이화간호학회지 Vol.- No.50

Purpose: The purpose of this study was to identify college student's perception and practice of 'National Cancer Prevention Actions' and the factors that influence the perception and practice. Method: The participants were 310 undergraduates selected by convenience sampling at colleges in Seoul. Instrument was 2014 Survey of Perception and Practice of National Cancer Prevention Actions by National Cancer Center(2014), and has been modified for the purpose of the study. The data were analyzed by t-test, ANOVA and Scheffe test with SPSS 23.0 Windows software. Results: The most recognized action for cancer prevention in college students was "Do not smoke, also avoid smoking smoke"(96.8%) while the most unrecognized was "Get a type B hepatitis vaccination"(58.7%). The most practiced action for cancer prevention in college students was "Sexually as to safe sex"(94.8%) while the most unpracticed was "Exercise five times a week or more, for at least 30 minutes a day"(33.9%). Among general characteristics, participants' age (t=-2.015, p<.05), major (F=3.109, p<.001), and residential type (F=4.959, p<.01) were statistically significant in the recognition of Cancer Prevention Actions and major(F=3.341 p<.05) and residential type(F=3.827, p<.05) were also significant in the practice of Cancer Prevention Actions. Among health characteristics, health concern(F=3.154, p<.05) and education in cancer(t=-3.112, p<.01) showed statistically significant differences in the recognition of Cancer Prevention Actions while health concern(F=7.896 p<.001) and subjective health status(F=9.913, p<.001) showed differences in the practice of Cancer Prevention Actions. Conclusion: These findings showed the gap between the perception and practice of cancer prevention actions. Considering the importance of individual characteristics, it is essential to develop a differentiated cancer prevention education program for college students. Also, nursing intervention program should be developed to raise the alertness of cancer in order to enhance cancer preventive practice.

먹는 피임약 Microlut에 대한 임상적 연구

郭顯模,宋燦浩 대한산부인과학회 1974 Obstetrics & Gynecology Science Vol.17 No.12

약용작물을 가해하는 주요해충의 분포현황

곽준수,김창수,송영은,김주,한종현,신민교,송호준 대한본초학회 1997 大韓本草學會誌 Vol.12 No.1

This study performed for surveying insect pests which are distributing on medicinal plants in Korea. On the basis of pre-submitted data which were reported artificially, we analyzed the data and arranged the catalogue for surveying on medicinal plants in Korea. We classified it by family centering with host plants and arranged the catalogue of main insect pests by plants. The major results are as follow ; 1. The main insect pests which inflict injuries on medicinal plants showed totals on 539 species in 3 phyla, 4 classes, 14 orders and 105 families. 2. By population, arthopods were topped with 489 species (2 phyla, 11 order and 91 families) followed by nemathelminthes 47 species (1 phylum, 2 orders and 12 families), mollusca 3 species (1 phylum, 1 order and 3 families) etc. 3. Crops which showed relatively wide in host range are as follows ; Tylenchus sp. of nemathelminthes was recorded in 38 species of medicinal plants, Acusta despecta of mollusca was in 25 plants, two-spotted spider mite was in 47, tea-red spider mite was in 46, differentiate grasshopper was in 44, cotton aphid was in 23, and Sitochroa verticalis was in 33 plants.

거주지역에 따른 유아의 기호도 조사

곽동경,이혜상,박신정,최은희,홍완수,장미라 대한영양사협회 1998 대한영양사협회 학술지 Vol.4 No.1

The purpose of this study was to evaluate the preference trend of children in the child-care centers in relation to certain environmental factors such as size of the residing town. This evaluation was conducted using questionnaire survey where the mother of each child was required to complete a preference questionnaire including 83 food items. Statistical data analysis was completed using SAS package program. The results of this survey showed the followings : 1. Generally, the preference level of the children living in large cities were higher than those of medium cities except in case of vegetables, while the preference level of the children living in large cities were higher than those of rural area except in case of hard-boiling(jorim) and vegetables. The subjects showed high preferences to bulgogi(4.53), pork-cutlet(4.52), fried chicken(4.51), jajangmyone(4.45), kimgui(4.43), roasted fish(4.31), kim-bab(4.17), roasted ham(4.13). 2. There was a tendency that a la carte, bread and noodles received higher preference scores. Items of Korean style soup attained higher preference scores than stew(ggigae). The preference scores of fried, broiled or pan-fried items(jun) were higher than those of other items such as seasoned vegetables(namool). 3. The preference scores of children (routinely or occasionally) skipping breakfast or supper were generally low. There was no significant difference according to the existence of mother's job except in case of steamed or pan-fried items, provided that the preference scores of the children whose mother had a job were slightly higher in general. Further, there was no significant difference according to the size of the monthly income of the household except stew, provided that the preference scores of the children whose household had lower income were slightly higher in general.

발효유의 항암효과

곽해수,김명희 한국유가공기술과학회 2000 Journal of Dairy Science and Biotechnology (JMSB) Vol.18 No.2

This study was to review recent reports on antimutagenicity and anticancer activity of fermented milk products in human and animal models. Antimutagenic and binding properties of various strains of Lactobacillus and Bifidobacterium on the mutagenicity of amino acid pyrolysates were investigated in vitro using a streptomycin -dependent (SD510) strains of Salmonella typhimurium TA 98. The fecal bacterial enzymes were shown to play an important role in the incidence of colon cancer. These were increased on a western diet, but reduced by consumption of Lactobacilli and Bifidobacteria with the diet. In animal models having tumors, Lactobacilli cultures also significantly suppressed the growth of Sarcoma, Leukemia and Carcinoma. Therefore, antimutagenicity and anticancer effects of fermented milk with lactic acid bacteria have been widely demonstrated.