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Underwater sound channel in the northeastern East China Sea
Song, Heechun,Cho, Chomgun,Hodgkiss, William,Nam, SungHyun,Kim, Sea-Moon,Kim, Byoung-Nam Elsevier 2018 Ocean engineering Vol.147 No.-
<P><B>Abstract</B></P> <P>In May 2015 a shallow-water acoustic variability experiment (SAVEX15) was conducted in the northeastern East China Sea. Surprisingly, an underwater sound channel that is typical for deep water was discovered in this shallow water waveguide (∼100 m deep) with the channel axis at around 40 m. For a broad-band source (0.5–2.0 kHz) deployed close to the channel axis, channel impulse responses observed by a vertical array exhibited a complex arrival structure with a large delay spread (e.g., 160 milliseconds). Most arrivals are found to be surface and bottom reflected, while a pair of high-intensity refracted arrivals are embedded in the early reflected arrivals. Broadband simulations based on a normal mode propagation model show good agreement with data.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An underwater sound channel (USC) typical for deep water is found in the shallow northeastern East China Sea. </LI> <LI> Detailed observations on the environments and underwater acoustic data are presented. </LI> <LI> A complex structure of sound arrivals observed under the USC is separated into refracted and surface/bottom reflected ones with a broad-band simulation. </LI> </UL> </P>
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주관적 건강인식과 건강검진 결과의 비교분석을 통한 건강행위 연구
문상식,이시백 韓國保健敎育.健康增進學會 2001 보건교육건강증진학회지 Vol.18 No.3
The purpose of this study is to analyze health behavior by comparing the difference between self-perceived health status and health examination results. The study subjects consist of 7,702 people aged over 20, surveyed by Health Interview survey, Health Examination survey, Dietary Life survey, Health Consciousness and Behavior survey Data used in the study are drawn from raw data from a 1998 National Health and Nutrition survey. Goneral characteristics variables are sex, age, education level, residential area, marital status, occupation, and living standard while dichotomous variables, 'not healthy' and 'healthy' are used to measure self-perceived health status. Variables for health examination results are high blood pressure, high cholesterol, diabetes, liver diseases, liver inflammation, kidney diseases, normal weight, regular diet, optimum sleeping time(7-8 hours), regular health examination and health behavior practice group. Major findings of the study are as follows: 1)Analysis of self-perceived health status and health behavior by disease : Variables significantly correlated with high self-perceived health status have strong associations with high health behavior practice, which supports the hypothesis that as one has high self-perceived health status, one is more likely to practice health promoting behavior. The results of analysis of health behavior differences by dividing subjects into two categories, 'cases of illness' and 'cases of no illness' indicate that drinking, sleeping time, health examination are significant variables (p<0.001, 0.05) whereas smoking, weight control, regular exercise, regular diet are not significant. 2)Analysis of disparity patterns between self-perceived health status and health examination : The hypothesis that health behaviors would be different according to the disparity pattern between self-perceived health status and health examination is supported as a result of χ2 test. Among Type I : Self-perceived health status is high and actual health status is good (no disease) Type II : Self-perceived health status is high and actual health status is poor(have disease) Type III : Self-perceived health status is low and actual health status is good(no disease) Type IV : Self-perceived health status is low and actual health status is poor(have disease) Type I and Type IV show no disparity, Type I shows the highest health promoting behavior whereas Type IV shows the lowest health promoting behavior Type II, and III, compared to Type I, practise lower health promoting behavior Multi-logistics regression analysis was conducted to find out the degree of impact on health behavior. Independent variables are goneral characteristics, self-perceived health status and health examination result and presence of illness, while the dependent variable is health promoting behavior. The analysis of the impact of self-perceived health status on the health promoting behavior shows that smoking, drinking, weight control, regular exercise, health examination practice, and/or regular diet are significantly correlated to self-perceived health status, High self-perceived health status is inversely related to high health promoting behavior. This finding supports the hypothesis that the higher one perceives one's health, the more likely one is to practice health promoting behavior. On the contrary, the presence of illness has little impact on health promoting behavior. 3)Multiple logistics analysis on how disparity patterns between self-perceived health status and health examination affect health behavior : The results of multiple logistics analysis made on health behavior variables compared to the standard variable are as follows: When analyzed on the standard of Type I, smoking is a significant risk factor for the Type IV. In case of drinking, all the patterns show a high probability of relative task ratio. With regard to weight control, it is a risk factor for Type II while all the patterns show high probability of not practising when analyzed on the standard of type IV.Type III and IV show high probability of not doing regular exercise while Type IV, shows a high probability of not taking appropriate sleeping time. When analyzed on the standard of type IV, all the patterns show a high probability of not taking health examinations. Type III and IV show a high probability of not having regular meals. As for overall health promoting behavior, Type III and IV show a high relative risk ratio. These two groups have low self-perceived health status. It implies that self-perceived health status has significant impact on health promoting behavior. This is also supported by the fact that Type I with high self-perceived health status and no illness shows a high practice rate of health promoting behavior. Types II and III the groups with high disparity between self-perceived health status and health examination results, show a low practice rate of health promoting behavior when compared to Type I. Type IV, that is the group with low self-perceived health status and actual illness, shows the lowest practice of health promoting behavior. It is highly probable that this type proves to be the poorest health group.
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손시환,문점동,김기원 진주산업대학교 농업기술연구소 1997 農業技術硏究所報 Vol.10 No.-
초기배자로부터 분할란의 성(性) 감별과 분할배의 발생 성공은 성의 식별과 더불어 유전적으로 우수한 개체의 생산이 가능함을 의미한다. 따라서 본 연구에서는 새앙쥐(mouse) 및 소의 초기배자 상태의 수정란을 이용한 염색체 분석 기술을 개발하고, 각 수정란의 성의 판별과 이들의 유전적 특성을 구명하고자 하였다. 초기 배자를 이용한 염색체 분리의 최적 조건을 결정하기 위하여 colcemid의 농도, colcemid의 처리시간 및 공시된 배자의 발생단계별 분석을 새앙쥐의 배자로서 수행하였다. 분석 결과 염색체 분리에 있어 colcemid의 처리 시간이 유의적인 차이를 보인 반면 다른 요인들 간에는 별다른 차이가 없는 것으로 나타났다. 소의 체외수정란을 이용한 염색체 분석에서는 공시된 수정란의 93%이상에서 증기상의 유도가 가능하였고, 이들 중 65%에서 성의 식별이 가능하였다. 또한 수정란의 분석된 성비는 1:1로서 자연적 성비와 일치하였다. 염색체 분석에 의한 배자의 조기성 감별은 처리 과정상의 기술적 요인들에 의해 매우 큰 영향을 받는데 특히 hypotonic의 처리방법 및 fixation의 방법을 적절히 처리하므로서 효율적이고 높은 성공률을 기대할 수 있다. Chromosome analysis from biopsied or splitted embryos which were fertilized in uitro or in vivo implicates a possibility of production of the genetical superior animals and sex controlled individuals. Therefore, this study was carried out to develop the technical method for chromosome preparation from early bovine and mouse embryos and to identify their sex and genetic characteristics. To determine optimum condition of chromosome preparation, the several factors which include the concentration of colcemid, the duration of culture and embryonic stage were analyzed from mouse embryos. According to analysis, the duration of culture had significantly influence on chromosome preparation. The other factors were not significantly difference among the treatments. In the results of chromosome preparation from intact bovine embryos, the rate of embryos with one or more metaphase plates was 93%, and of embryos with sex analyzable metaphase chromosomes are 65%. Sex ratio of male and female was approximatly 1:1 same as natural sex ratio. The inducing rate of analyzable metaphase was mainly due to technical aspects, expecially hypotonic treatment and fixation.
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안정화제 처리된 회수수를 사용한 콘크리트의 특성에 관한 실험적 연구
박영신,박재명,이세현,이문환 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
Recently, Most enterprises produced ready mixed concrete uses a mixing water as a recycling water without a density control in proportion to guide and standard. That is a cause of deterioration in the concrete quality like a reduce of strength, laitance, crack, etc. This study shows basic materials for development of ready mixed concrete recycling water density control system that holds down a deterioration in the concrete quality by using a mixed water treated recycling water with stabilizing agent and examines a possibility of re-using components of cement in recycling water. Therefore, in the experiment, we make a recycling water contains 3,5,7% of solid content ratio examines a property of a mixing water with a stabilizing agent and without it. Results of this study is next as follow. 1. The slump is decreased 1~2cm in a mixing without a stabilizing agent and the mixing with a stabilizing agent is similar to the standard mixing. 2. The air content is 4~4.7% in proportion to an increase of solid content without a stabilizing agent and the mixing with a stabilizing agent is similar to the standard mixing. 3. The compressive strength of an early curing age is tendency to increase both the mixing without a stabilizing agent and the mixing with a stabilizing agent. But, After 14days is passed, Compressive strength is decreased in a mixing without a stabilizing agent but increased a mixing with a stabilizing agent.
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김기영,박샛별,문지혜,이상대,이새롬,장윤정 충남대학교 농업과학연구소 2013 농업과학연구 Vol.40 No.2
This study was performed to develop a rapid test kit for pathogenic Staphylococcus in various samples. The rapid detection kit has been fabricated based on nitrocellulose lateral-flow strip. Colloidal gold and Staphylococcus antibodies were used as a tag and a receptor, respectively. Manually spotted Staphylococcus antibody and anti-mouse antibody on the surface of nitrocellulose membrane were used as test and control lines, espectively. Feasibility of the rapid kit to detect Staphylococcus aureus in samples were evaluated. The intensity of the color of the tes line started to increase with the samples in which higher concentration of the cells were contained. The sensitivity of the sensor was 106 cfu/mL Staphylococcus spiked in PBS. Also, the rapid test kit could detect 105 cfu/mL of Staphylococcus in chicken meat extract.
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