• 한국화재소방학회논문지
• /
• 제18권2호
• /
• pp.34-40
• /
• 2004

층류 비예혼합 분류 화염에서 다양한 주파수와 강도로 외부에서 유동장에 자극을 주었을 때 화염의 배출특성과 거동에 대해서 실험적으로 조사하였다. 먼저 일정한 관 공명 주파수에서 가진 강도를 가변시켜 난류화염 된 부상화염에서 질소산화물 배출 지수($EINO_x$)를 측정하였다. 또한, 가진 강도가 일정한 상태에서 주파수를 0 Hz에서 높은 주파수인 2 KHz까지 다양한 주파수 조건으로 가진된 한 경우에도 질소산화물의 배출지수를 측정하였다. 큰 가진 강도의 관공명 주파수로 가진된 경우 부상된 난류화염에서 $NO_x$ 배출 특성은 다음과 같이 크게 세 가지 형태의 특성을 보였다. Group I의 화염에서는 공간적인 섭동이 크며 비교적 화염길이가 길고 높은 $NO_x$ 배출 특성을 보였으며 Group II에서는 상대적으로 짧은 길이와 좁은 폭의 화염거동에 낮은 $NO_x$배출 특성을 보였다. Group III에서는 약간 긴 화염길이에 매우 큰 화염체적으로 상당한 높이까지 시ㆍ공간적으로 섭동이 큰 운동양태로 부상되는 거동과 가장 높은 $NO_x$ 배출 특성을 보였다.

• 대한수학회논문집
• /
• 제34권1호
• /
• pp.55-82
• /
• 2019

Given ${\sigma}:G{\rightarrow}G$ an involutive automorphism of a semigroup G, we study the solutions and stability of the following functional equations $$f(x{\sigma}(y))=f(x)g(y)+g(x)f(y),\;x,y{\in}G,\\f(x{\sigma}(y))=f(x)f(y)-g(x)g(y),\;x,y{\in}G$$ and $$f(x{\sigma}(y))=f(x)g(y)-g(x)f(y),\;x,y{\in}G$$, from the theory of trigonometric functional equations. (1) We determine the solutions when G is a semigroup generated by its squares. (2) We obtain the stability results for these equations, when G is an amenable group.

• 대한수학회지
• /
• 제46권3호
• /
• pp.475-491
• /
• 2009

In [2], we identified the group of units of finite local rings $\mathbb{Z}_4[X]$/($X^k+2X^a$, $2X^r$) with certain restrictions on a. In this paper we find direct sum decomposition of the group of units of such rings without restrictions on a into cyclic subgroups by finding their generators. And further generalization is considered.

• 한국환경보건학회지
• /
• 제21권1호
• /
• pp.78-85
• /
• 1995

Ornithine decarboxylase(ODC) is an indicate enzyme in carcinogenesis. We divided Sprague Dawley rats into six groups: control, electric field exposure, X-ray only irradiation, X-ray irradiation with electric field exposure group, Sr-90 injected group and Sr-90 and electric field complex exposure group. The ODC activity was measured in rat's bone marrow cell every week. The results were summarized as follows: The ODC activitied was increased in X-ray irradiated, Sr-90 injected and Sr-90 and electric field complex exposed group as compared with that of control(p<0.05). The ODC activity was increased comparing that of control neither in X-ray and electric field complex exposed group nor electric field only exposed group. This result suggests that the electric field doesn't have myeloid carcinogenicity and myeloid cancer incidence caused by ionized radiation is suppressed by electric field exposure.

• Korean Journal of Mathematics
• /
• 제5권2호
• /
• pp.177-183
• /
• 1997

Let ${\sigma}(X,x_0,G)$ be the fundamental group of a transformation group (X,G). Let $R({\varphi},{\psi})$) be the generalized Reidemeister number for an endomorphism $({\varphi},{\psi}):(X,G){\rightarrow}(X,G)$. In this paper, our main results are as follows ; we prove some sufficient conditions for $R({\varphi},{\psi})$ to be the cardinality of $Coker(1-({\varphi},{\psi})_{\bar{\sigma}})$, where 1 is the identity isomorphism and $({\varphi},{\psi})_{\bar{\sigma}}$ is the endomorphism of ${\bar{\sigma}}(X,x_0,G)$, the quotient group of ${\sigma}(X,x_0,G)$ by the commutator subgroup $C({\sigma}(X,x_0,G))$, induced by (${\varphi},{\psi}$). In particular, we prove $R({\varphi},{\psi})={\mid}Coker(1-({\varphi},{\psi})_{\bar{\sigma}}){\mid}$, provided that (${\varphi},{\psi}$) is eventually commutative.

• 동의신경정신과학회지
• /
• 제22권4호
• /
• pp.201-218
• /
• 2011

Objectives : The aim of this study was to investigate the effects of Guibi-Tang(GBT) on focal brain ischemic injury induced by intraluminal filament insertion in rats. Methods : The ischemia was induced by intraluminal filament insertion into middle cerebral artery. Sprague-Dawley rats were divided into five groups, normal group(n=8); control group was ischemia induced and no treatment(n=8); GBT 1X group was ischemia induced and administrated 42.2 mg/ml/kg of Guibi-Tang orally(n=8); GBT 3X group was ischemia induced and administrated 126.6 mg/ml/kg of Guibi-Tang orally(n=8); GBT 6X group was ischemia induced and administrated 253.2 mg/ml/kg of Guibi-Tang orally(n=8) for 21 days. mGluR5, Bax, Bcl-2 and cytochrome C were investigated to observe the effects of Guibi-Tang on apoptosis. The effects of Guibi-Tang on neuroprotective/apoptotic agents in cresyl violet, choline acetyltranferase(ChAT) with ischemic injury were investigated. Results : The intensity of mGluR5 mRNA in the hippocampal CA1 was increased in normal and GBT(Guibi-Tang) 1X groups compared with the control group. The intensity of Bax mRNA in the hippocampal CA1 was decreased in normal and GBT 1X groups compared with the control group. However it was increased unexpectedly in GBT 3X group. The intensity of Bcl-2 mRNA in the hippocampal CA1 was increased in normal and GBT 1X groups compared with the control group. The intensity of Bax/Bcl-2 ratio in the hippocampal CA1 was decreased in normal and GBT 1X groups compared with the control group. The intensity of cytochrome C protein in the hippocampal CA1 was decreased in normal, GBT 1X and GBT 6X groups compared with the control group. The density of neurons stained by cresyl violet and ChAT was increased in normal and GBT 1X groups compared with the control group. Conclusions : These results suggest that Guibi-Tang may have protective effect on vascular dementia.

• 호남수학학술지
• /
• 제33권1호
• /
• pp.19-25
• /
• 2011

Let G be the general linear group GL(n,$\mathbb{C}$), $W_0$ the Weyl group of G and W the extended a neWeyl group of G. Then it is well-known that W is a union of the double cosets $W_{0x}W_0$ as x moves over the set of dominant weights of W. It is also known that each double coset $W_{0x}W_0$ contains a unique element $m_x$ of the shortest length. These shortest length elements belong to what are called the canonical left cells. However, it is still an open problem to find the canonical left cell containing a given $m_x$. One of the mai purposes of this paper is to introduce a new approach to attack this question. In particular, we will present a conjecture which explicitly describes the canonical left cells containing an element $m_x$. We will show that our conjecture is true for some specific types of $m_x$.

• Journal of Ginseng Research
• /
• 제15권3호
• /
• pp.171-178
• /
• 1991

The results ok feeding experiments to the mice with ginseng extract, ginseng Powder, and ADAPTAGEN, for 30 days before X-ray irradiation and for 40 days after the X-ray irradiation at 750 rads were as follow: 1. The 50% lethals days (LD50, ) by the X-ray irradiation were 9 days at 1, 000 rads. 10 days at 900 rads, 11 days at 800 rads, 14 days at 760 rads, and 19 darts at 750 rads. Therefore, the standard radiation dose was set at 750 radb/8 min. 2. The 80% of the control group mice exposed to the X-ray radiation without ginseng feeding died in periods ranging from 14 to 24 days and the 20~30% of the ginseng extract and ginseng powder feeding groups died. But the 100% of the mice fed with ADAPTAGEN survived. 3. Testicles of the control group became smaller in weight than the nomad group by 26.5 to 29.0% and those of the ginseng extract and ginseng powder feeding group reduced by 44.6 to 60.4%. However, testicles of the ADAPTiIGEN feeding group increased in size by 77.4% to 87.1% and in weight by 61%, showing a recovery phenomenon approarhing to those of the ordinary mice. The ADAPTAGEN feeding group mice were also as active in color as the ordinary ones. 4. An electron micrograph(X8, 000X2.2) of the liver cells of the mice which had been 40 days after X-ray irradiation showed as follows; The control group appeared that is physiological action stopped due to the frequent occurrence of morphological change of the nucleus and diffusion of chromosome, reduction in microspores and expansion of microsomts, and endoplasmic change of mitochondria. The liver cells or the ADAPTAGEN feeding group were in a state similar to those of the ordinary mice restoring to normalcy In contrast, the liver cells of the ginseng extract and ginseng powder feeding groups were still far from being normal. 5. A serological analysis showed that the control group sharply decreased in albumin, Y-g1obu1in, and IgG so far as to cause dystrophy and to weaken antibody resistance but that ginseng extract and ginseng powder feeding groups, though in a little more restoring state than the control group, were still far from the normal group. The ADAPTAGEN feeding group restored to a state as comparable to the normal group in the contents of albumin ${\gamma}$-globulin, IgG and serum protein. In order words, it is noteworthy that ADAPTAGEN feeding was effective in revitalizing the destroyed cells of a living body and that it has the function of normalizing antibody components.

• Korean Journal of Mathematics
• /
• 제7권2호
• /
• pp.151-158
• /
• 1999

Let (X, G) be a transformation group and ${\sigma}(X,x_0,G)$ the fundamental group of (X, G). In this paper, we prove that the Reidemeister number $R(f_G)$ for an endomorphism $f_G:(X,G){\rightarrow}(X,G)$ is a homotopy invariant. In particular, when any self-map $f:X{\rightarrow}X$ is homotopic to the identity map, we give some calculation of the lower bound of $R(f_G)$. Finally, we discuss commutativity and product formula for the Reidemeister number $R(f_G)$.

• Radiation Oncology Journal
• /
• 제8권1호
• /
• pp.17-27
• /
• 1990

온열요법이 X-선조사에 미치는 영향을 연구하기 위하여 저자는 100 watt, 2450 MHz의 마이크로파 온열기구를 제작하여 백서 60마리를 대상으로 고환에 온열요법 ($43^{\circ}C$, 15분), X-선 조사($2\;Gy\~8\;Gy$ 단독 혹은 병행하여 조직학적 변화를 관찰하여 다음과 같은 결론을 얻었다. 1. 2450 MHz 마이크로파 온열요법 단독 시행하여 조직학적 변화는 관찰되지 않았다. 2. X-선 조사후 초기변화는 정조세포의 변성을 2 Gy에서 나타나기 시작하였으며 괴사는 6 Gy 후 심하게 보였고 8 Gy 후 완전소실되었다. 3. X-선 조사와 온열요법 병행하여 2 Gy후 정조세포의 괴사와 소실이 나타나기 시작하였으며 6 Gy 후 완전소실되어 열증강율은 1.3 이었다. 4. X-선조사, 온열요법 단독 및 병행후 추적기간 15일군과 30일군의 차이는 관찰할 수 없었다.