• Journal of applied mathematics & informatics
• /
• 제26권1_2호
• /
• pp.395-400
• /
• 2008

Although the properties of flatness and condition (E) for Sacts over a monoid S are incomparable, Liu([10]) showed that necessary and sufficient condition for a monoid S over which all left S-acts that satisfy condition (E) are flat is the regularity of S. But the problem of describing a monoid over which all cyclic flat left S-acts satisfy condition (E) is still open. Thus the purpose of this paper is to characterize monoids over which all cyclic flat right S-acts satisfy condition (E).

• Kyungpook Mathematical Journal
• /
• 제56권4호
• /
• pp.1115-1123
• /
• 2016

Let $D{\subseteq}E$ be an extension of integral domains with characteristic zero, I be a nonzero proper ideal of D and let H(D, E) and H(D, I) (resp., h(D, E) and h(D, I)) be composite Hurwitz series rings (resp., composite Hurwitz polynomial rings). In this paper, we show that H(D, E) satisfies the ascending chain condition on principal ideals if and only if h(D, E) satisfies the ascending chain condition on principal ideals, if and only if ${\bigcap}_{n{\geq}1}a_1{\cdots}a_nE=(0)$ for each infinite sequence $(a_n)_{n{\geq}1}$ consisting of nonzero nonunits of We also prove that H(D, I) satisfies the ascending chain condition on principal ideals if and only if h(D, I) satisfies the ascending chain condition on principal ideals, if and only if D satisfies the ascending chain condition on principal ideals.

• 대한수학회보
• /
• 제39권2호
• /
• pp.269-276
• /
• 2002

Let E be a real Banach space. Let T : E longrightarrow E be a map with F(T) : = { x $\in$ E : Tx = x} $\neq$ 0 and satisfying the accretive-type condition $\lambda\$\mid$x-Tx\$\mid$^2$, for all $x\inE,\;x^*\inf(T)\;and\;\lambda >0$. We prove some necessary and sufficient conditions for the convergence of the Mann iterative sequence to a fixed point of T.

• 한국환경농학회지
• /
• 제7권1호
• /
• pp.14-20
• /
• 1988

폴리에틸렌필름(P.E)멀칭이 제초제(除草劑) alachlor, pendimethalin, diphenamid의 토양(土壤) 및 수확물중(收穫物中)의 잔류성(殘留性)에 미치는 영향(影響)에 대(對)하여 고추, 땅콩, 참깨포장(圃場)에서 로지조건(露地條件)을 대조(對照)로 하여 조사(調査)하였다. 토양중(土壤中)에 있어서 3종제초제(種除草劑)의 로지조건(露地條件)에서의 반감기(半減期)는 alachlor의 경우 땅콩과 참깨포장(圃場)에서 $3{\sim}4$ 일(日), pendimethalin은 고추포장(圃場)에서 30일(日), diphenamid는 고추, 땅콩, 참깨포장(圃場)에서 $24{\sim}46$ 일정도(日程度)였다. 분해(分解)가 빨랐던 alachlor의 반감기(半減期)는 로지조건(露地條件)과 P.E.피복조건(被覆條件)에서 거의 차(差)가 없었다. 분해(分解)가 느렸던 pendimethalin과 diphenamid는 로지조건(露地條件)에서보다 P.E.피복조건(被覆條件)에서 각각(各各) 30일(日)과 $20{\sim}90$ 일간(日間) 더 길었다. P.E.피복(被覆)의 유무(有無)에 관계(關係)없이 pendimethalin은 최종적(最終的)으로 수확(收穫)된 고추에서 검출(檢出)되지 않았으며 alachlor도 땅콩과 참깨에서 검출(檢出)되지 않았다. diphenamid의 땅콩중(中) 잔류량(殘留量)은 0.147ppm(투명(透明) P.E. 피복조건(被覆條件))${\sim}0.071ppm$(로지조건(露地條件))이었고, 참깨중(中) 잔류량(殘留量)은 0.022ppm(투명(透明) P.E. 피복조건(被覆條件))${\sim}0.129ppm$(로지조건(露地條件))이었는 바, 이는 양조건(兩條件)에서 잔류허용량(殘留許容量)(0.2ppm) 이하(以下)였다.

• 대한수학회지
• /
• 제44권2호
• /
• pp.261-273
• /
• 2007

In this paper, we introduce some new properties of a topological space which are respectively generalizations of $Fr\'{e}chet$-Urysohn property. We show that countably AP property is a sufficient condition for a space being countable tightness, sequential, weakly first countable and symmetrizable, to be ACP, $Fr\'{e}chet-Urysohn$, first countable and semimetrizable, respectively. We also prove that countable compactness is a sufficient condition for a countably AP space to be countably $Fr\'{e}chet-Urysohn$. We then show that a countably compact space satisfying one of the properties mentioned here is sequentially compact. And we show that a countably compact and countably AP space is maximal countably compact if and only if it is $Fr\'{e}chet-Urysohn$. We finally obtain a sufficient condition for the ACP closure operator $[{\cdot}]_{ACP}$ to be a Kuratowski topological closure operator and related results.

• Korean Journal of Mathematics
• /
• 제13권1호
• /
• pp.1-11
• /
• 2005

The purpose of the present paper is to introduce a new concept of the E($^*{\kappa}$)-connection ${\Gamma}^{\nu}_{{\lambda}{\mu}}$, which is both Einstein and ($^*{\kappa}$)-connection, and to obtain a necessary and sufficient condition for the existence of the unique E($^*{\kappa}$)-connection in $n-^*g$-UFT. Next, under this condition, we shall obtain a surveyable tensorial representation of the unique E($^*{\kappa}$)-connection in $n-^*g$-UFT.

• 한국학교ㆍ지역보건교육학회지
• /
• 제19권2호
• /
• pp.77-86
• /
• 2018

Objectives: This study aimed identify of the level and effect of the e-health literacy and health behavior in health science majors Methods: The data was collected from March 5 to March 15, 2018 for student majoring in health science at a university in the C city. The data were analyzed with the SPSS 21.0. Results: First, the e-health literacy were statistically significant in grades (F=5.769, p=0.001), health interest (F=10.553, p<0.001) and health care time (F=3.841, p=0.023), and health behavior were statistically significant in subjective health condition (F=5.476, p=0.05), health interest (F=16.716, p<0.001), and health care time (F=28.479, p<0.001). Second, the e-health literacy were correlated with grades, health care time, economic level and health interest, and health behavior were related to health care time, e-health literacy, subjective health condition and health interest. Third, health behavior related factors were health care time, e-health literacy, grades, subjective health condition, and health interest. Conclusion: The related knowledge and skills should be applied to basic classes in order to ensure that health science majors care can accurately utilize the information on the e-health.

• Journal of Radiation Protection and Research
• /
• 제2권1호
• /
• pp.24-30
• /
• 1977

P.W.R. 형 원자로 증기발생기에서 발생되는 배수는 방사성 물질에 의하여 오염된다. 일반적으로 이 원자로의 증기발생기에 공급되는 급수는 'Phosphate'로 pH를 조절했으나 근래에는 'Ammonia' 조절방법이 선진제국에서 각광을 받고 있는 실정인 바 이는 약알카리로 pH를 조절하여 장치의 부식을 방지하기 위함이다. 본 실험에서는 이온 교환 수지탑을 이용하여 'Ammonia'로 조절된 배수를 처리하는 실험을 하였는 바, Acid Form의 Carboxylic, Cationic 몇 Anionic Ion Exchange Resinces Columns의 직열상태로 운전하였을 시 $^{137}Cs$과 $^{90}Sr$의 제염계수(Decontamination Factor)가 가장 높은 값을 나타낼 수 있으며 또한 그 처리능력이 가장 양호한 편으로 판명되었다.

• 한국미생물·생명공학회지
• /
• 제34권1호
• /
• pp.35-39
• /
• 2006

높은 C4 대사활성을 보이는 반추위미생물이 가지는 포도당 발효대사 조절양식의 한가지를 대장균에서 모사하였다. 대장균은 glycolytic condition에서는 phosphoenolpyruvate(PEP) ${\leftrightarrow}$ oxaloacetate(OAA)간 반응을 phosphenolpyruvate carboxylase(PPC)에 의해, gluconeogenetic condition에서는 phosphoenolpyruvate carboxykinase(PCK)에 의해 촉매하도록 조절한다. 반면 반추위미생물은 glycolytic condition에서 PCK를 통하여 반응이 촉매된다. 이러한 조절양식의 차이점이 C4 대사활성에 미치는 영향을 조사하기 위하며 ppc가 돌연변이되고 대신 인위적으로 PCK를 발현할 수 있는 대장균을 제조하였다. 이렇게 PEP-OAA간 대사조절이 변이된 대장균 K12 ppc-/pck+는 야생형 K12보다 2.5배의 높은 C4대사활성을 보였다. 대장균에서의 C4 대사생리를 증가시키는 연구는 대사공학을 이용한 여러가지 유용물질(i.e. 숙신산, ALA)생산에 응용하기 위한 기초자료로 활용될 수 있을 것으로 기대된다.

• Journal of applied mathematics & informatics
• /
• 제26권5_6호
• /
• pp.983-989
• /
• 2008

The purpose of this paper is to continue the investigation of monoids over which various properties of acts happen to coincide. Special concern is to characterize monoids by regular right acts. In particular there are given some characterizations of monoids over which all right acts that satisfy condition (E)(or condition (P)) are regular.