• 농업과학연구
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• 제43권4호
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• pp.612-622
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• 2016

The purpose of this study was to evaluate the effects of sex, birth year, birth season, and parity of sows on their progeny using the following on-farm test records: Backfat Thickness (BF), Fresh Meat Percent (FMP), Loin depth (LD), Age at 90kg (90D), and Average Daily Gain (ADG). Statistical analysis was performed using data collected from 1,178 Yorkshire and 13,395 Landrace progenies, which were born from 119 Yorkshire and 1,191 Landrace sows, respectively between 2011 and 2015. All results of the analysis were statistically significant (P < 0.05) except the birth season effect on LD. For Landrace, the highest ratings were found to be at the $5^{th}$ parity (BF), at the $3^{rd}$ parity (FMP and LD), at the $2^{nd}$ parity (90D and ADG). For Yorkshire, the highest ratings were at the $2^{nd}$ parity (BF and FMP), at the $3^{rd}$ parity (LD), and at the $4^{th}$ parity (90D and ADG). Although the ratings of carcass traits of progeny appear to be higher between the maternal sow's $2^{nd}$ and $4^{th}$ progenitor, no significant relations to parity were found. Based on these results, we concluded that maternal parity is not significantly affect carcass traits of progeny and thus that the best slaughtering age of sows should not be determined solely based on maternal parity but also in consideration of other factors such as unit costs of production. The results of this study would provide fundamental information to future studies on the effect of economical parity on sows and swine breeding.

• Laboraroty Animal Research
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• 제34권4호
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• pp.317-328
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• 2018

Cognitive impairment responses are important research topics in the study of degenerative brain diseases as well as in understanding of human mental activities. To compare response to scopolamine (SPL)-induced cognitive impairment, we measured altered parameters for learning and memory ability, inflammatory response, oxidative stress, cholinergic dysfunction and neuronal cell damages, in Korl:ICR stock and two commercial breeder stocks (A:ICR and B:ICR) after relevant SPL exposure. In the water maze test, Korl:ICR showed no significant difference in SPL-induced learning and memory impairment compared to the two different ICRs, although escape latency was increased after SPL exposure. Although behavioral assessment using the manual avoidance test revealed reduced latency in all ICR mice after SPL treatment as compared to Vehicle, no differences were observed between the three ICR stocks. To determine cholinergic dysfunction induction by SPL exposure, activity of acetylcholinesterase (AChE) assessed in the three ICR stocks revealed no difference of acetylcholinesterase activity. Furthermore, low levels of superoxide dismutase (SOD) activity and high levels of inflammatory cytokines in SPL-treated group were maintained in all three ICR stocks, although some variations were observed between the SPL-treated groups. Neuronal cell damages induced by SPL showed similar response in all three ICR stocks, as assessed by terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay, Nissl staining analysis and expression analyses of apoptosis-related proteins. Thus, the results of this study provide strong evidence that Korl:ICR is similar to the other two ICR. Stocks in response to learning and memory capacity.

• Clinical Endoscopy
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• 제56권1호
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• pp.119-124
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• 2023

Inflammatory pseudotumor (IPT) is a rare benign tumor of unknown etiology that can occur in almost any organ system. It has neoplastic features such as local recurrence, invasive growth, and vascular invasion, leading to the possibility of malignant sarcomatous changes. The clinical presentations of colonic IPT may include abdominal pain, anemia, a palpable mass, and intestinal obstruction. A few cases of colonic IPT have been reported, but colonic IPT with pedunculated morphology is very rare. Furthermore, since it can mimic malignant polyps, understanding the endoscopic findings of colonic IPT is important for proper treatment. Herein, we present a case of colonic IPT with pseudosarcomatous changes, presenting as a large polyp, mimicking a malignant polyp in the cecum, along with a literature review.

• East Asian mathematical journal
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• 제18권2호
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• pp.211-218
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• 2002

In this paper, we introduce the notion of almost topological convergence spaces and almost pretopological convergence spaces, and prove that these are product invariant.

• Laboraroty Animal Research
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• 제33권2호
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• pp.57-67
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• 2017

The inhibitory effects of Asparagus cochinchinensis against inflammatory response induced by lipopolysaccharide (LPS), substance P and phthalic anhydride (PA) treatment were recently reported for some cell lines and animal models. To evaluate the hepatotoxicity and nephrotoxicity of A. cochinchinensis toward the livers and kidneys of ICR mice, alterations in related markers including body weight, organ weight, urine composition, liver pathology and kidney pathology were analyzed in male and female ICR mice after oral administration of 150, 300 and 600 mg/kg body weight/day saponin-enriched extract of A. cochinchinensis (SEAC) for 14 days. The saponin, total flavonoid and total phenol levels were found to be 57.2, 88.5 and 102.1 mg/g in SEAC, respectively, and the scavenging activity of SEAC gradually increased in a dose-dependent manner. Moreover, body and organ weight, clinical phenotypes, urine parameters and mice mortality did not differ between the vehicle and SEAC treated group. Furthermore, no significant alterations were measured in alkaline phosphatase (ALP), alanine aminotransferase (ALT), aspartate aminotransferase (AST), lactate dehydrogenase (LDH), blood urea nitrogen (BUN) and the serum creatinine (Cr) in the SEAC treated group relative to the vehicle treated group. Moreover, the specific pathological features induced by most toxic compounds were not observed upon liver and kidney histological analysis. Overall, the results of the present study suggest that SEAC does not induce any specific toxicity in the livers and kidneys of male and female ICR mice at doses of 600 mg/kg body weight/day.

• 한국과학교육학회지
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• 제44권2호
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• pp.141-153
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• 2024

2022 개정 과학과 교육과정은 AI를 활용한 탐구 활동을 경험함으로써 융합적 사고를 바탕으로 일상생활과 사회 속 과학 문제를 해결할 수 있는 능력을 기르는 것을 목표로 한다. 이에 과학 교과와 AI를 융합한 과학-AI 융합교육 프로그램을 개발하고 이를 활용하여 고등학생을 대상으로 융합 수업을 진행하였다. 과학-AI 융합 수업은 감쇠진자의 운동을 정성적으로 이해하고 블록코딩 플랫폼 KNIME을 사용하여 진자의 위치를 예측할 수 있는 AI 모델을 구축하는 것을 목표로 한다. 개별 심층 면담을 통해 학습자의 경험을 이해하고 해석하고자 하였다. Giorgi의 현상학적 연구 방법론을 바탕으로 학습자의 참여 동기, 배움과 변화, 어려움과 수업의 한계를 기술하였다. 학생들은 AI에 대한 관심과 사회적 트렌드에 대한 인식을 바탕으로 수업에 참여하고자 하는 동기를 가지고 있었다. 학생들은 직접 데이터를 수집하고 AI 모델을 구축하는 것을 배웠다. 실험 결과를 바탕으로 주변 현상을 예측할 수 있을 것으로 기대하였으며 융합 수업을 긍정적으로 인식하였다. 한편, 여전히 익숙하지 않은 플랫폼, AI 원리 이해를 어려움으로 인식하였고 따라해야만 하는 수업 방식의 한계와 수업 내용상의 한계를 인식하였다. 융합 수업의 경험은 실생활의 문제를 AI를 통해 해결하고자 하는 학습 동기로 나타났으며, 학생들이 느낀 어려움과 한계는 더 심화되고 확장된 주제를 학습하고 싶은 동기로 이어졌다. 이를 바탕으로 과학-AI 융합 수업을 위한 논의 및 제언을 도출하였다. 본 연구는 과학-AI 융합 수업을 개발하고 이를 현장에 적용할 때 시사점을 제공할 것으로 기대된다.

• Molecules and Cells
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• 제47권3호
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• pp.100009.1-100009.3
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• 2024

• Molecules and Cells
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• 제46권12호
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• pp.743-745
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• 2023

• Current Optics and Photonics
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• 제1권2호
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• pp.157-162
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• 2017

In large liquid crystal displays, the image quality in an oblique viewing direction is a crucial issue. From this perspective, 8-domain polymer-stabilized vertical alignment (PS-VA) mode has been developed to suppress the color shift in oblique viewing directions, compared to that in 4-domain PS-VA mode. To realize the 8-domain PS-VA, the four domains in a pixel are each divided into two regions, such that applying different electric potentials result in different tilt angles in these two regions, while keeping four azimuthal directions in each domain. However, applying different voltages in a pixel causes drawbacks, such as requiring additional processes to construct a capacitor and a transistor, which will further reduce the aperture ratio. Here we propose a different approach to form the 8-domain, by controlling surface polar anchoring energy and the width of patterned electrodes in two regions of a pixel. As a result, the gamma-distortion index (GDI), measured at an azimuthal angle of $0^{\circ}$, is reduced by about 23% and 8%, compared to that of a conventional 4-domain at polar angles of $30^{\circ}$ and $60^{\circ}$ respectively.

• Current Optics and Photonics
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• 제3권1호
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• pp.66-71
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• 2019

Application of liquid crystal (LC) materials to a flexible device is challenging because the bending of LC displays easily causes change in thickness of the LC layer and orientation of LCs, resulting in deterioration in a displayed image quality. In this work, we demonstrate a prototype device combining a flexible polymer substrate and an optically isotropic LC-polymer composite in which the device consists of interdigitated in-plane switching electrodes deposited on a flexible colorless polyimide substrate and the composite consisting of nano-sized LC droplets in a polymer matrix. The device can keep good electro-optic characteristics even when it is in a bending state because the LC orientation is not disturbed in both voltage-off and -on states. The proposed device shows a high potential to be applicable for future flexible LC devices.