• Bulletin of the Korean Chemical Society
• /
• 제24권5호
• /
• pp.638-640
• /
• 2003

• 치위생과학회지
• /
• 제14권4호
• /
• pp.589-596
• /
• 2014

본 연구는 치면열구전색 하방의 우식이 이차우식에 미치는 영향을 평가하기 위해 DIAGNOdent를 이용하여 소구치 및 대구치 교합면 446부위를 4개의 군으로 분류하였고 상방에 치면열구전색을 시행한 뒤 이차우식을 유발시켜 DIAGNO dent로 재측정하였다. 또한 치과 업무 관련 종사자들을 대상으로 치면열구전색에 대한 인식도 및 실태를 조사하여 다음과 같은 결과를 얻었다. 시진 및 탐침 시 법랑질우식군에서 치면열구전색 후 이차우식이 가장 높게 나타났으며 초기우식군, 착색군, 건전부위군 순으로 통계적으로 유의한 차이를 보였다(p<0.05). 치면열구전색 전 치아우식증 진단 방법으로는 시진이 가장 높은 비율로 나타났다. 레이저 우식진단기에 대해 56.6%가 모르는 것으로 나타났으며, 91.6%가 보유하지 않은 것으로 나타났다. 치면열구전색 후 이차우식 발생의 원인은 치면열구전색제가 깨져서 하방에 우식이 생긴 경우가 가장 많았다. 이상의 결과를 종합하면, 치면열구전색 하방의 우식이 전색 후 이차우식 유발에 영향을 미치는 것으로 나타났다. 따라서 치면열구전색 후 이차우식을 예방하기 위해서는 열구 내 우식 정도를 정확하게 진단 평가하는 것이 중요하며, 보다 객관적으로 진단할 수 있는 우식 진단기기의 사용에 대한 교육 및 홍보가 필요할 것으로 생각된다.

• 전기화학회지
• /
• 제13권1호
• /
• pp.45-49
• /
• 2010

The rechargeable Zn-air battery is considered as one of the potential candidates for the next generation secondary batteries due to its many advantages. However, its further applications and commercialization have been limited by the complexity of the reactions on air electrode which are oxygen reduction and evolution reactions (ORR/OER) upon discharging and charging processes, respectively. In the present study, lanthanum was impregnated into a commercial Pt/C gas diffusion electrode, and it clearly verified significantly enhanced cycling stability and reversibility. The results presented in this study show the possibility of repeated charge/discharge processes for Zn-air batteries with a La-loaded air electrode, and they demonstrate the potential as a promising next generation secondary battery.

• Journal of Korean Biological Nursing Science
• /
• 제18권2호
• /
• pp.69-77
• /
• 2016

Purpose: This study aimed to investigate the effects of a secondary stroke prevention education program on the health risk indicators and self-care compliance of stroke patients. Methods: A non-equivalent control group pretest-posttest design was used to select the participants. Subjects were 54 stroke patients (27 in the experimental group and 27 in the control group) hospitalized in a K university hospital in D city, Korea. Health risk indicators and self-care compliance were measured both for a baseline, as well as after intervention. The data was analyzed using a chi-square test, paired t-test and ANCOVA. Results: There were significant differences in systolic blood pressure, diastolic blood pressure, fasting blood sugar, weight and self-care compliance. Conclusion: The results of the study indicate that an educational secondary stroke prevention program is effective for health risk indicators and self-care compliance of patients. Therefore it can be used as an effective nursing intervention in clinical practice.

• Journal of Electrochemical Science and Technology
• /
• 제7권2호
• /
• pp.161-169
• /
• 2016

Porous tungsten oxide thin films were prepared by electrodeposition and tested as anodes of lithium secondary batteries. The synthesized films were composed of nanoparticles of 60-140 nm size, with porosities of 30-40 %. Increasing the temperature turned out to be a more effective approach to introduce porosity in the structure than increasing the electrolyte viscosity. The assessment of the synthesized films as anodes of lithium secondary batteries revealed a much higher initial discharge capacity for the porous than the dense samples. The discharge capacity retention significantly increased with increasing porosity and was further enhanced by heat treatment. In particular, a thin film composed of particles of about 140 nm in size and with a porosity of 40 % exhibited an initial discharge capacity higher than 600 mAh/g and a remaining capacity above 300 mAh/g after 30 cycles. Following heat treatment, the remaining capacity of this sample after 30 cycles increased to about 500 mA h/g.

• 한국어병학회지
• /
• 제29권1호
• /
• pp.1-5
• /
• 2016

Isopods are parasitic crustaceans that pose serious threat to fisheries. Several studies have tried to explore the host-pathogen relationship between marine fishes and isopods. The present study aims to understanding the secondary infections in marine fishes pertaining to isopods. To assess the secondary infection in infected fishes, parasite infested and healthy tissues of fishes were collected. The samples were subjected to standard microbiological procedure to identify the presence of pathogenic bacteria and fungi. Our results showed the branchial region had the higher microbial load of non-sporulating cenocytic fungi in infected fishes. Moreover, fungal strains isolated from the parasitic lesion confirmed that the parasitation and body lesion facilitates the entry of several pathogenic microbes at the damaged host tissue. More over the immune regulation of fish fights back by producing minute cysts, trying to encapsulate the growing fungus. But this may eventually lead to systemic infestation and death of the fish.

• 한국과학교육학회지
• /
• 제29권3호
• /
• pp.277-290
• /
• 2009

In the era of the outcome-based education, multiple-choice test has been widely employed owing to its efficiency that enables educators to evaluate a quantity of students with much objectiveness. However, the prevalent test has not been reconsidered enough to overcome its apparent shortcomings: examiners' effort for developing plausible and faultless distracters defending from every falsification, and students' random guessing on key choices. For alleviating such defects, tiered test as an experimental format of multiple-choice tests has been suggested in science education. Since there has not accumulated much study on the implementation of tiered tests, our research aim is set to construct a framework suggesting statistical indexes for rationally discerning tiered units that develop an effective tiered test. Graded both by our tiered-scoring and by the conventional partial-scoring, the preliminary tiered test in secondary physics attests the improvement in its discrimination and difficulty distribution. The findings reveal that the two indexes discern effective tiered items: discrimination increase (Ct-p) and difficulty decrease (Dp-t). Based on the index information, 4 heterogeneous tier types are recommended in the content of secondary physics: directional manipulation, repeated calculation, diverse explanation, and plural variables.

• Journal of Astronomy and Space Sciences
• /
• 제40권4호
• /
• pp.131-148
• /
• 2023

Lunar permanently shadowed regions (PSRs) never see direct sunlight and are illuminated only by secondary illumination - light reflected from nearby topography. The ShadowCam imaging experiment onboard the Korea Pathfinder Lunar Orbiter is acquiring images of these PSRs. We characterize and discuss the nature of secondary illumination for the Shackleton PSR from ShadowCam radiance-calibrated images. We also use modeling to understand the magnitude and direction of the secondary illumination. Results from our analysis highlight the non-homogeneous, dynamic, and complex nature of PSR secondary lighting. Knowledge of the direction of the secondary illumination is crucial for reli-able interpretation of contrasts observed in ShadowCam images. This preliminary analysis of the floor of Shackleton crater from images acquired over multiple secondary illumination conditions does not reveal indications of exposed surface ice, even though temperatures are constantly below 110K.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
• /
• pp.1445-1447
• /
• 2008

Micro crystal structure of polycrystalline MgO film is controlled by adjusting the energy of particles arrived at the substrate during deposition. The change of crystal structure affects on the total area of (200) surface where the oxygen vacancies are formed easily, resulting in the change of secondary electron emission (SEE) coefficient($\gamma$).

• 공학교육연구
• /
• 제21권3호
• /
• pp.38-45
• /
• 2018

The purpose of this study is to analyze the change of perceptions and images of teachers about engineering, according to practical training in laboratories of engineering research institutes. For this purpose, 149 elementary and secondary school teachers were surveyed before and after visiting the engineering research institutes and examined the perception of engineers and engineering. Through this teacher training program, perceptions and images of most teachers are changed positively and they can understand practically about engineering, and related fields. The results of this study can be used as basic data for the development, operation, and expansion of teacher training using advanced science and technology research institutes with excellent human and material resources.