• 한국환경과학회지
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• 제23권6호
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• pp.1021-1027
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• 2014

This study was designed in order to determine the influences of haw (Crataegus pinnatifida $B_{UNGE}$) on the lipid metabolism syndrome. Sprague Dawley rats, 7 weeks old, were given four different types of diets for 5 weeks: ND group (noncholesterolemic diet), HE group (non cholesterolemic diet+haw extract), CD group (cholesterolemic diet), CH group (cholesterolemic diet+haw extract). Concentrations of LDL-cholesterol, triglyceride, phospholipid, free cholesterol, cholesteryl ester, blood glucose were remarkably higher in the CD group than the other groups. But by treatment of haw extract group with cholesterolemic diet (CH group) were significantly decreased compared with CD group. Cholesteryl ester ratio was no difference between CD group and CH group. These results indicate that Crataegus pinnatifida $B_{UNGE}$ would be effective in lipid metabolism syndrome.

• 통합자연과학논문집
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• 제14권3호
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• pp.139-146
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• 2021

The purpose of this paper is to classify the torsion-free extensions 1→ℤ³→𝛱→ℤ_𝜱→1 with injective abstract kernel 𝜙 : ℤ_𝜱→Aut(ℤ³). From this classification, we handle the sufficient conditions so as to classify the crystallographic groups of Sol⁴_m,n.

• 대한수학회보
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• 제59권4호
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• pp.951-960
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• 2022

In this paper, we determine the finite p-group such that the intersection of its any two distinct minimal nonabelian subgroups is a maximal subgroup of the two minimal nonabelian subgroups, and the finite p-group in which any two distinct 𝓐₁-subgroups generate an 𝓐₂-subgroup. As a byproduct, we answer a problem proposed by Berkovich and Janko.

• 생명과학회지
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• 제30권4호
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• pp.321-330
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• 2020

본 연구의 목표는 CuCl₂가 지브라피시에 미치는 영향을 조사하는 것이다. CuCl₂에 대한 지브라피시의 반수치사농도를 조사하기 위하여 각기 다른 시간에 따른 농도를 설정하여 노출시켰다. 본 연구에서는 스트레스 반응의 증가를 보기 위하여 whole-body cortisol level 측정과 행동약리학적 변화를 측정하기 위해서 open field test와 novel tank test를 실시하였다. Whole-body cortisol의 sample을 수집하거나 행동실험을 실시하기 전에 CuCl₂ 또는 vehicle을 1시간 동안 처리하였다. CuCl₂의 반수치사농도는 24시간, 48시간, 96시간에서 각각 30.3, 25.3, 14.8 ㎍/l으로 측정되었다. CuCl₂에 노출된 지브라피시의 novel tank test의 결과는 총 이동거리, 움직이는 시간 그리고 속도는 유의성이 있게 감소한 반면, turn angle은 최고농도에서 유의성이 있게 증가하였다(p<0.05). 다른 행동실험인 open field test의 결과에서도 총 이동거리, 움직이는 시간 속도가 CuCl₂의 노출에 의해서 감소하였으며, turn angle과 meandering이 유의하게 증가하였다(p<0.05). CuCl₂에 노출된 지브라피시의 whole-body cortisol은 1.5 or 15 ㎍/l의 농도에서는 유의하게 증가하였으나, 150 ㎍/l의 농도에서는 유의성 있는 변화를 발견하지 못하였다(p<0.05). 본 연구의 결과는 CuCl₂의 노출이 지브라피시에서 치사율 증가, 행동 및 내분비의 변화 등을 포함하는 독성 반응을 야기하는 것을 나타낸다.

• 한방재활의학과학회지
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• 제30권3호
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• pp.45-56
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• 2020

Objectives This study was designed to investigate the effects of ChondroT on thrombus in FeCl₃-induced rats. Methods We exposed FeCl₃ to rat's carotid artery to induce thrombus. Specimens were divided in 5 groups; Intact, Control, ASA10 (aspirin 10 mg/kg), CT100 (ChondroT 100 mg/kg), and CT200 (ChondroT 200 mg/kg), each n=6. We investigated thromboxane, platelet activating factor (PAF), histological change, lipid metabolism, transaminase, leukocyte, erythrocyte and thrombocyte level. Results In ASA10, CT200 groups, there was significants decrease in both thromboxane level and total cholesterol level, compared to control group and there were significant histological changes of blood vessel, compared to control group. In CT200 group, there was significant decrease in PAF level, compared to control group (p<0.05). In ASA10, CT200 groups, triglycerides level tended to decrease, compared to control group. Conclusions Based on these results, it could be suggested that ChondroT was effective on thrombus in FeCl₃-induced rats, and further study is needed to conduct a rigorous clinical research.

• 대한물리의학회지
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• 제16권4호
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• pp.77-83
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• 2021

PURPOSE: This study examined the changes in the respiratory function when PNF chopping and lifting patterns were used in chronic stroke patients METHOD: The subjects were 30 patients diagnosed with chronic stroke. The respiratory function (FVC, FEV₁, and FEV₁/FVC) were measured by spirometry. Thirty subjects were divided randomly into an experimental group to which 15 PNF chopping and lifting were applied and a control group to which chest breathing exercise was performed. The intervention was conducted three times a week for six 6 weeks. To examine the effects of intervention, the pre- and post-intervention values for each group were compared using a paired t-test. An independent t-test was used to compare the differences in the values of changes pre- and post-intervention in the two groups. Statistical significance was set to .05. RESULTS: Satistically significant differences in FVC and FEV₁ were observed in both the experimental group and control group according to the intervention (p < .05). A statistically significant difference was found in FVC and FEV₁ compared to values of changes pre- and post-intervnetion between the experimental and control groups. There was no difference in FEV₁/FVC. CONCLUSION: The results suggest that PNF chopping and lifting can be applied as an excellent respiratory intervention program compared to general chest breathing exercises to improve respiratory function in stroke patients.

• 말소리와 음성과학
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• 제15권4호
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• pp.53-60
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• 2023

본 연구에서는 음성장애 환자에서 음성 범위 프로파일(voice range profile, VRP)과 말 범위 프로파일(speech range profile, SRP)을 이용한 추정 발화 기본주파수 절대 오차(absolute error of estimated speaking fundamental frequency, AEF0)를 음성장애의 병인 집단 간에 비교하여 차이를 확인하고,각 병인 집단 별로 AEF0와 관련된 변수들 간의 상관관계를 살펴보고자 하였다. 연구대상은 음성장애로 진단된 기능적(functional, FUNC), 기질적(organic, ORGAN), 신경학적(neurogenic, NEUR) 음성장애 환자군과 정상군(normal control, NC) 각 30명(남 15명, 여 15명)으로 총 120명이었다. 각 대상자로 하여금 음성, 말 범위 프로파일 과제를 수행하도록 하고 전기성문파형검사(electroglottography, EGG)를 통해 발화 기본주파수를 측정하였다. 병인 집단 간 AEF0의 비교 결과, Grade와 Severity는 병인 집단 간 차이가 없었던 반면, AEF0_VRP와 AEF0_SUM에서 병인 집단 간 차이가 있어 AEF0_VRP는 ORGAN이 FUNC와 NC보다 높았으며, AEF0_SUM은 ORGAN이 NC보다 높았다. 또한 FUNC와 NEUR에서는 AEF0가 Grade와 양의 상관관계를 보인 반면, ORGAN은 CQ(closed quotient)와 양의 상관관계가 있었다. 따라서 병인 집단에 따라 AEF0의 적용과 관련 음성 변수를 살펴보는 데 주의를 기울여야 할 것으로 보이며, 본 연구는 이러한 임상적 판단에 대한 기초 자료를 마련하는 데 일조한 것으로 여겨진다.

• 대한수학회보
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• 제57권1호
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• pp.207-218
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• 2020

Some modular representations of reflection groups related to Weyl groups are considered. The rational cohomology of the classifying space of a compact connected Lie group G with a maximal torus T is expressed as the ring of invariants, H*(BG; ℚ) ≅ H*(BT; ℚ)^W(G), which is a polynomial ring. If such Lie groups are locally isomorphic, the rational representations of their Weyl groups are equivalent. However, the integral representations need not be equivalent. Under the mod p reductions, we consider the structure of the rings, particularly for the Weyl group of symplectic groups Sp(n) and for the alternating groups A_n as the subgroup of W(SU(n)). We will ask if such rings of invariants are polynomial rings, and if each of them can be realized as the mod p cohomology of a space. For n = 3, 4, the rings under a conjugate of W(Sp(n)) are shown to be polynomial, and for n = 6, 8, they are non-polynomial. The structures of H*(BT^n-1; 𝔽_p)^A_n will be also discussed for n = 3, 4.

• 한국수소및신에너지학회논문집
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• 제33권4호
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• pp.383-390
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• 2022

Appropriate explosion proof electrical equipment should be installed in hazardous areas. In areas where hydrogen is handled, explosion proof electrical equipment adjacent to the hydrogen handing facility must be reviewed for selection of gas group IIC (or IIB+H₂) equipment. When selecting explosion proof electrical equipment for the flammable substance handling facility in areas where hydrogen and flammable substance are handled, the method to avoid gas group IIC (or IIB+H₂) equipment has been suggested by using the operating pressure of the hydrogen handling facility. When the operating pressure of the outdoor hydrogen handling facility is 1.065 MPa or less, it has been confirmed that there is no need to install gas group IIC (or IIB+H₂) equipment for the flammable substance handling facility adjacent to the hydrogen handling facility. And the method of selecting explosion proof electrical equipment for the flammable substance handling facility has been suggested as a flowchart, so it will be able to be utilized when selecting appropriate explosion proof electrical equipment.

• 대한수학회지
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• 제60권5호
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• pp.1087-1107
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• 2023

Let E be an elliptic curve defined over ℚ of conductor N, c the Manin constant of E, and m the product of Tamagawa numbers of E at prime divisors of N. Let K be an imaginary quadratic field where all prime divisors of N split in K, P_K the Heegner point in E(K), and III(E/K) the Shafarevich-Tate group of E over K. Let 2u_K be the number of roots of unity contained in K. Gross and Zagier conjectured that if P_K has infinite order in E(K), then the integer c · m · u_K · |III(E/K)| $\frac{1}{2}$ is divisible by |E(ℚ)_tor|. In this paper, we prove that this conjecture is true if E(ℚ)_tor ≅ ℤ/2ℤ or ℤ/4ℤ except for two explicit families of curves. Further, we show these exceptions can be removed under Stein-Watkins conjecture.