자기공명(magnetic resonance, MR)영상에서 주로 발생하는 Rician 노이즈는 영상의 화질을 저하하는 주요 요소 중의 하나이다. 본 연구에서는 노이즈 제거에 효율적이라고 잘 알려진 총변이(total variation, TV) 알고리즘을 모 델링하여 Rician 노이즈 레벨에 따른 파라미터를 최적화하고자 한다. 시스템은 8채널 기반의 3.0 T 장치를 활용하였 고 물 팬텀 영상을 획득하여 각각 Rician 노이즈를 0.05, 0.10, 0.15, 그리고 0.20 값을 부가하였다. TV 알고리즘 은 Rudin-Osher-Fatemi 모델을 기반으로 모델링하였고 최적화를 수행하기 위하여 반복수 파라미터를 조정하여 획득된 영상에 적용하였다. 결과적으로 Rician 노이즈 레벨을 0.05, 0.10, 0.15, 그리고 0.20을 사용하였을 때 각 각 30, 40, 80, 그리고 120 반복수를 기반으로 한 TV 노이즈 알고리즘에서 가장 우수한 신호 대 잡음비(signal to noise ratio, SNR)와 대조도 대 잡음비(contrast to noise ratio, CNR) 결괏값이 도출되었다. 또한, 최적화된 반복수를 적용한 TV 알고리즘을 사용한 MR 영상에서 기존의 위너 및 중간값 필터를 사용하였을 때 비하여 SNR과 CNR 모두 우수한 값을 획득할 수 있었다. 특히 기본적으로 획득된 MR 영상보다 최적화된 TV 알고리즘을 적용한 영상의 평균 SNR과 CNR은 각각 3.11 및 3.31배 향상됨이 증명되었다. 결론적으로, 노이즈 제거 효율이 우수한 TV 알고리즘의 최적화된 파라미터를 활용한다면 MR 영상에서의 활용 가능성이 클 것으로 기대한다.

PURPOSES : The current research aims to evaluate the impact of coating materials and temperature on the percentage of bead loss in pavement markings. METHODS : Five mixtures with varying numbers of coating layers (C0, C1, C2, C3, and C4) were prepared to assess the effect of coating layers on bead loss. The effect of stripping was simulated using a modified Hamburg Wheel Tracking test. Furthermore, the influence of temperature and coating material on bead loss was examined using control mixture (without coating), YR, and SY coating mixtures. The percentage bead loss was evaluated by a developed image analysis program. RESULTS : The results demonstrated a substantial reduction in bead loss as the number of coating layers increased, with the C4 mixture showing an impressive 4.3% bead loss after 500 HWT braking cycles compared to 27.4% for the C0 mixture. Higher testing temperatures resulted in increased bead loss, with the control mixture exhibiting the highest percentage loss at 7,500 HWT rolling cycles. Conversely, the YR and SY coating mixtures displayed superior resistance to bead loss. Statistical analysis confirmed the significance of coating layers in reducing bead loss, further supporting the effectiveness of coatings in preserving bead adhesion during HWT cycles. CONCLUSIONS : The findings highlight the potential of coating materials as a key protective measure for enhancing the longevity and performance of pavement markings.

Lee, Hye-Kyung. (2023). “The Speech Act of Explanation in Closure Signs”. The Sociolinguistic Journal of Korea, 31(4), 1-32. This study investigates the speech act of explanation within a corpus of approximately 243 closure signs posted during the Covid-19 pandemic in Korea. Using a classification system derived from Bella and Ogiermann (2022), the explanations are categorized into four distinct groups. Category 1 explanations are further divided into three subcategories: signs revealing the relationships between government decisions and closures, those with expressions of support for official mandates, and those presenting dissent with closure directives. A comparative analysis between the third sub-category and pandemic-related activities (i.e., My Body My Choice Activities) is also conducted, highlighting similarities and differences. Category 2 centers on safety concerns, emphasizing public health and safety as the primary justification for closures. Notably, this category showcases an elevated sense of agency among sign authors. Explanations in Category 3 combine Categories 1 and 2. Category 4 explanations, which attribute closure to Covid-19, necessitate an investigation of terms referring to Covid-19. It is observed that the naming closely adheres to normative and public guidelines, reflecting a collective awareness of the crisis and a commitment to cooperation. The findings contribute valuable insights into the linguistic and cultural characteristics of explanations within Korean business closure signs, indicating phenomena specific to Korean communities.

‘지역사회 계속거주(AIP: Aging in Place)’는 자율적이고 독립적인 노년의 삶을 원하는 노인들의 욕구 와 노인시설 운영비용 부담을 줄이고자 하는 정부의 필요성이 부합되면서 인구 고령화에 대처하는 새로운 패러다임으로서 주목받으며 활발히 논의되고 있다. AIP에 관한 국내외의 다양한 연구들은 AIP가 노년기의 삶의 질에 긍정적인 영향을 미치고 있음을 주장하는데, 이는 노인이 자립적으로 생활할 수 있는 사회환경이 제공되었을 때 가능하다. 본 연구는 사람이 살아가는데 가장 기본적인 필수 의료와 임종기 완화의료 및 돌봄 등의 실태를 점검하고 AIP 관련 정책의 현행 법령과 제도를 살펴봄으로써, 국가와 지방정부의 책무는 무엇이며 향후 그 책무를 충실히 이행하기 위한 실효적 방안들은 무엇인지에 관하여 제언한다.

To develop quality-improved bakery products, the influence of the partial replacement of wheat flour by Artemisia princeps leaf powder (APP) on the quality characteristics of cookies, including antioxidant activities, was investigated. Studies were carried out to evaluate the addition of different percentages of APP on the quality characteristics of cookies prepared by incorporating APP (1-4%) into wheat flour. The incorporation of APP significantly affected the cookies’ physicochemical parameters and sensory acceptance attributes. Such incorporation at different levels significantly reduced moisture content while increasing the cookie dough’s density (p<0.05). The spread ratio, loss rate, L*, and b* values of the cookies decreased, but their hardness and a* value increased significantly with increasing levels of APP substitution (p<0.05). 2,2-Diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azino-bis-3-ethylbenzthiazoline- 6-sulphonic acid (ABTS) radical scavenging activities were significantly increased (p<0.05) with higher APP substitution and were well-correlated. Hedonic sensory results showed that cookies fortified with 2% APP generally received satisfactory and acceptable acceptance scores. Consumers seemed to prefer the cookie texture in terms of chewiness when the samples were softer and lighter but less reddish, whereas taste acceptance may be a dominant factor in overall acceptability.