This study is to deal with a failure phenomenon that occurred during a vibration test on an Inertial Navigation System mounted on a self-propelled howitzer. Vibration occurs naturally due to the operation characteristics of self-propelled howitzers, The study describes a case of failure that occurred during the durability verification process. It explains the function and configuration of the INS(Inertial Navigation System) and describe how the failure occurred through understanding the phenomenon. Based on the occurrence phenomenon, an in-depth cause analysis was conducted and fundamental improvement measures were presented to prevent recurrence. It is expected that this study will aid as a reference for problem solving when similar failures occur in the future.

In recent years, the world has been undergoing a "century of great changes", and the global political and economic landscape is undergoing profound changes. The development of regional economic and political integration continues to be dynamic. As an important part of the East Asian regional economy, China- Asean (10+1) cooperation is booming, but the regional economic development mechanism in East Asia is not yet sound. In the future, China-Asean (10+1) cooperation should not only be based on enhancing East Asia's comprehensive competitiveness in the global context, but also seize the opportunity of profound changes not seen in a century to further improve the cooperation mechanism.

본 연구는 한국 비례대표제의 변화 과정을 통해 준연동형 비례대표제를 검토하면서 제22대 비례대표 국회의원선거에서 나타나는 정당의 공천 과정 과 선거 결과를 분석하였다. 한국의 비례대표제는 지역구에 기반한 제1당 우 선적 배분 방식에서 시작해 지역구에 기반한 병립형 비례대표제, 1인 2표 정당명부식 병립형 비례대표제, 1인 2표 정당명부식 준연동형 비례대표제로 변화하였다. 제22대 비례대표 국회의원선거를 위한 후보의 공천 과정은 절 차적으로는 정당성과 투명성에 기반한 것으로 보이지만 현실적으로는 각 정 당이 영입한 인사를 공천하는 한계를 보였다. 제22대 비례대표 국회의원선 거 결과는 유력한 여야의 위성정당이 전체의석의 69.57%를 차지하였고, 지 역구 후보를 공천하지 않은 더불어민주연합과 국민의미래, 조국혁신당이 전 체의석의 95.65%를 차지하였다. 준연동형 비례대표제는 정당의 이해관계에 따라 제도적으로 오용됨으로 비례대표 정당의 지역구 공천 하한선을 도입하 고, 대표성을 위해 연령별로 최소할당제를 도입할 필요가 있다.

Insect cuticular extracellular matrices (ECM) including the eggshell and exoskeleton play vital roles in protecting them from natural environmental stresses. However, these chitinous ECMs must be degraded at least in part during embryonic and post-embyonic molting periods to accommodate continuous growth all the way to the adult stage. In this study we investigated the functions of groups I and II chitinases, TcCHT5 and TcCHT10, in turnover of the eggshell and cuticle in Tribolium castaneum. RNAi and TEM analyses revealed that TcCHT10 is required for digestion of chitin in the serosal cuticle for embryo hatching as well as in the old cuticle during post-embryonic molts including larval-pupal and pupal-adult metamorphosis. However, although TcCHT5 is apparently involved in these vital physiological events, TcCHT10 could substitute for TcCHT5 except during the pupal-adult molting when both enzymes are indispensable to degrade chitin in the old pupal cuticle.

Eriocraniidae is a microleidopteran family (Lepidoptera: Eriocraniidae) that includes six genera and distributed to the Holarctic region. The larvae of this family are known leaf miners, typically infesting Betula and Ouercus. Herein. the first reord of the genus Dyeriocrania Spuler, 1910 in Korea is presented, including the previously undscribed species. Adult and female genitalia are provided based on illustrations.

Cerebrovascular disease (CVD) refers to a condition wherein the normal functioning of the brain is impaired, resulting in either temporary or permanent damage. The causes of CVD include both hemorrhagic and ischemic events. A cerebrovascular accident (CVA) refers to a condition that occurs acutely. A CVA typically involves a sudden blockage of blood supply to the brain or the rupture of blood vessels, causing damage to brain tissue. This results in impairment of crucial brain functions and can manifest in various neurological signs. This study investigated characteristics of the signalment, clinical symptoms, lesion locations, and prevalence of CVA diagnosed using a 3.0T MRI in dogs. The breeds included 5 Maltese and one each of Poodle, Pomeranian, Chihuahua, Shih-tzu, and Yorkshire terrier. There was one neutered male, five intact males, two spayed females, and two intact females. The median age and weight were 7.5 years and 3.39 kg, respectively. Clinical signs included gait abnormality in five dogs, and four dogs exhibited seizures. Additionally, there were cases of head tilt or turn (n=3) and nystagmus (n=1). The most frequently affected region was the cerebrum (n=7), followed by the cerebellum (n=3), brainstem (n=2), and thalamus (n=1). Three cases exhibited multiple lesions among these regions. In this study using a 3.0T MRI scanner, the prevalence rate was 4.39%, which was higher than that reported in previous studies.

This study addresses the environmental impact associated with waste management and natural aggregate production. It explores the potential of utilizing Coal Bottom Ash (CBA) and Reclaimed Asphalt Pavement Aggregate (RAPA) as complete replacements, respectively, for fine and coarse aggregates in concrete. Despite their similarities to natural aggregates, CBA and RAPA often end up in landfills. Laboratory tests were conducted, revealing satisfactory performance in drying shrinkage and air void parameters. However, while the flexural strength met design requirements, the compressive and splitting tensile strengths were lower than predicted. The deviation in strength development behavior from natural aggregate concrete (NAC) was attributed to weak agglomerated aggregates in RAPA and the large size of the interfacial transition zone (ITZ) due to the old asphalt coating surrounding RAPA. To enhance the strength behavior, two methods were employed: compaction in the form of roller-compacted concrete and RAPA abrasion carried out by rolling RAPA in a concrete mixer. Compaction improved aggregate interlock, while RAPA abrasion decreased agglomerated aggregates and minimized asphalt coating, reducing ITZ size. These treatments resulted in improvements in compressive, flexural, and splitting tensile strengths, with the combination of both treatments having the most significant effect. Analysis of relationships between flexural, splitting tensile, and compressive strengths indicated that CBA and RAPA concrete behaved more similarly to NAC after the treatments. This research suggests that with appropriate interventions, it is feasible to utilize CBA and RAPA in concrete, contributing to sustainable construction through improved waste management, carbon footprint reduction, and conservation of natural resources.