• 한국건설관리학회논문집
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• 제6권3호
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• pp.144-155
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• 2005

1950년대 이후 주택수요의 급격한 증가와 낮은 주택투자로 인한 만성적 주택부족 사태는 정부 주도의 주택공급정책에 의존해 오고 있다. 주택시장이 수요와 공급에 의한 자율적 가격결정구조를 가지지 못하고 정부 정책에 따라 인위적으로 움직임으로써 주택가격은 폭등과 폭락을 반복하고, 아파트 미분양 등에 의한 건설사의 수익성 악화나 중소건설업체의 부도와 같은 문제점들이 발생하고 있다. 이는 건설기업이 주택시장의 구조적 문제점을 파악하고 정부의 정책에 시기 적절히 대처하지 못함으로써 주택시장적응력을 상실한 결과라 할 수 있다. 또한 정부도 주택시장의 가격에 의존한 단기적 정책 효과만을 의존함으로써 주택시장의 가격결정시스템을 약화시키는 결과를 초래한 것이다. 즉, 주택시장의 동태적 환경시스템이라는 숱을 보지 못하고 정부 정책에 의한 단기적 영향요인이라는 나무만을 봄으로써 나타난 결과라 할 수 있다. 따라서 본 연구는 주택 시장을 주택수요 영향변수와 주택공급 영향변수 그리고 그에 영향을 미치는 거시 환경적 영향변수들을 분류하고, 이들 간의 상호작용을 시스템 사고와 전통적 소비자 선택이론에 입각하여 연결함으로써 이에 의해 구성되는 인과순환구조를 구축하도록 한다. 이를 통해 주택시장이 가지는 동태성의 장기적인 형태를 피드백 루프의 존재를 통해 확인해 줌으로써 주택시장의 역동적 변화 원인을 규명하고자 한다.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제13권1호
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• pp.67-75
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• 2002

연구목적：만성경련 환아의 가족 구성원들의 정신병리와 환아와의 관계를 평가하기 위해 본 연구를 실시하였다. 환아 어머니의 정신병리와 환아와의 관계 및 부부관계를 조사하였고, 환아 아버지와 타 형제들과 환아와의 관계를 조사하였으며, 부모와 아동사이의 의존성정도와 가족구조를 평가하였다. 연구방법：만성경련질환 환아40명과 성별-나이-학업수준이 일치하는 대조군 30명을 연구대상으로 하였다. 만성환아군은 12개월 이상 약물 치료를 받고 있는 정상지능의 일반학교를 다니는 특발성 경련질환아였고, 대조군은 특별한 신체질환이 없는 중간성적 정도의 초등중학생으로 하였다. $2{\sim}3$차례에 걸친 부모 및 환아 면담을 반구조화된 인터뷰로 실시하였고, 부모와 대조군에게 가정환경척도, 간이정신진단검사, 아동의존척도를 배부하여 평가하도록 하였다. 연구결과：두세 차례에 걸친 가족면담에서, 대조군에 비해 유의하게 높은 부모의 과보호, 형제간 적대감 표출 등의 문제를 환아군에서 확인할 수 있었으며, 부부간의 갈등도 대조군에 비해 유의하게 높았다. 가정환경 척도평가에서 대조군에 비해 감정표현영역, 성취지향성영역, 지적-문화적 태도 영역, 적극적 여가선용 영역에서 유의한 저하를 보였고, 의존성척도에서도 정감적 의존, 의사소통에서의 의존, 여행의 어려움 등이 환아군에서 유의하게 높았다. 환아모의 정신병리도 대조군에 비해 거의 모든 척도에서 유의하게 높았으며, $30{\sim}40$대 도시거주 여성과 비교한 T값을 기준으로 할 때 40%정도가 우울-불안장애의 위험성이 있었다. 결 론：만성경련 환아를 둔 가족내에서, 가족구조상의 문제, 가족내 갈등, 환아에 대한 과보호와 과의존, 모의 정신병리 등이 보다 뚜렷하게 높은 것으로 평가되었으며, 이러한 연구결과는 경련환아의 가족에 대한 적극적인 치료적 중재가 필요함을 시사하는 소견이라고 할 수 있다.

• 한국주거학회논문집
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• 제27권6호
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• pp.9-18
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• 2016

This research was aimed at finding clues of improving behavioral affordance of the residential environment by scrutinizing change of the residents' behavior in a livingroom depending on the child's development stage. 30 double-income families with one child were the subjects of depths interview, survey, observation of this research, who were residents of 3-bedroom apartment housing in Seoul. They presented obvious different behavioral patterns according to their child's development stage. Breeding and playing behavior were prior to the others when their child was in childhood, then relaxing with TV and PC behavior were getting superior when their child was in school period. It is important that residents perceive that the numerous types of behavior may take place in a livingroom, some of which has originated in our long residential culture. And then real housing should be provided to them that has proper behavioral affordance to support all those behavior. Housings with minimum walls and rooms would make it possible. A family has its inner dynamics can live a sustainable life in that housing as a home, that lasts along their whole life.

• Genomics & Informatics
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• 제12권3호
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• pp.87-97
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• 2014

Although the number of protein-coding genes is not highly variable between plant taxa, the DNA content in their genomes is highly variable, by as much as 2,056-fold from a 1C amount of 0.0648 pg to 132.5 pg. The mean 1C-value in plants is 2.4 pg, and genome size expansion/contraction is lineage-specific in plant taxonomy. Transposable element fractions in plant genomes are also variable, as low as ~3% in small genomes and as high as ~85% in large genomes, indicating that genome size is a linear function of transposable element content. Of the 2 classes of transposable elements, the dynamics of class 1 long terminal repeat (LTR) retrotransposons is a major contributor to the 1C value differences among plants. The activity of LTR retrotransposons is under the control of epigenetic suppressing mechanisms. Also, genome-purging mechanisms have been adopted to counter-balance the genome size amplification. With a wealth of information on whole-genome sequences in plant genomes, it was revealed that several genome-purging mechanisms have been employed, depending on plant taxa. Two genera, Lilium and Fritillaria, are known to have large genomes in angiosperms. There were twice times of concerted genome size evolutions in the family Liliaceae during the divergence of the current genera in Liliaceae. In addition to the LTR retrotransposons, non-LTR retrotransposons and satellite DNAs contributed to the huge genomes in the two genera by possible failure of genome counter-balancing mechanisms.

• 한국생활과학회지
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• 제22권3호
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• pp.405-420
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• 2013

The purpose of this study was to find pathways among factors that distinguish the mothers' intention to have a second child. As for factors affecting the childbirth intention of mothers, this study aimed to explore pathways from fathers' participation in childrearing to intention of second childbirth as mediating variables, maternal parenting stress and marital satisfaction. This study used the third wave data of the Panel Study of Korean Children (PSKC) that is a national-representative birth-cohort study. Among the 1,802 participants of the PSKC, 717 mothers who have a husband/partner and only one child have responded a decided intention of second childbirth. SPSS 19.0 and Amos 19.0 were used to implement exploratory analyses of predictors and test path models. Results showed that the hypothetical model assuming a path from paternal involvement in childrearing to mothers' intention of second childbirth, mediated by maternal parenting stress and marital satisfaction fitted the data of working mothers and non-working mothers well. The results suggest policies focusing on internal characteristics of mothers and dynamics in the family.

• Journal of Microbiology
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• 제39권3호
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• pp.149-153
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• 2001

The electron transfer reaction is one of the most essential processes of life. Not only does it provide the means of transforming solar and chemical energy into a utilizable form for all living organisms, it also extends into a range of metabolic processes that support the life of a cell. Thus, it is of great interest to understand the physical basis of the rates and reduction potentials of these reactions. To identify the major determinants of reduction potentials in redox proteins, we have chosen the simplest electron transfer protein, rubredoxin, a small (52-54 residue) iron-sulfur protein family, widely distributed in bacteria and archaea. Rubredoxins can be grouped into two classes based on the correlation of their reduction potentials with the identity of residue 44; those with Ala44 (ex: Pyrococcus furiosus) have reduction potentials that are ∼50 mV higher than those with Va144 (ex: Clostridium pasteurianum). Based on the crystal structures of rubredoxins from C. pasteurianum and P. furiosus, we propose the identity of residue 44 alone determines the reduction potential by the orientation of the electric dipole moment of the peptide bond between 43 and 44. Based on 1.5 $\AA$ resolution crystal structures and molecular dynamics simulations of oxidized and reduced rubredoxins from C. pasteurianum, the structural rearrangements upon reduction suggest specific mechanisms by which electron transfer reactions of rubredoxin should be facilitated.

• The Plant Pathology Journal
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• 제28권4호
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• pp.433-438
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• 2012

Dinoflagellates are considered one of the most abundant and diverse groups of marine microplankton and viruses are recognized as one of the significant factors affecting the plankton dynamics. Here, we report basic characteristics of a new dinoflagellate-infecting virus, Heterocapsa pygmaea DNA virus (HpygDNAV) which infects a toxic dinoflagellate, H. pygmaea. HpygDNAV is a polyhedral large virus (ca. 160-170 nm in diameter) propagating in its host's cytoplasm. Because of the virion size, appearance in thin sections, and propagation characteristics, HpygDNAV is assumed to harbor a large double-stranded DNA genome; i.e., HpygDNAV is most likely a nucleocytoplasmic large DNA virus (NCLDV) belonging to the family Phycodnaviridae. Its infectivity is strain-specific, rather than species-specific, as is the case for other algal viruses. The burst size and latent period are estimated to be roughly 100-250 infectious units $cell^{-1}$ and < 96 h, respectively.

• Journal of Photoscience
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• 제4권1호
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• pp.23-30
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• 1997

Leaf movements in nyctinastic plants are produced by changes in the turgor of extensor and flexor cells, collectively called motor cells, in opposing regions of the leaf movement organ, the pulvinus. In Samanea saman, a tropical tree of the legume family, extensor cells shrink and flexor cells swell to bend the pulvinus and fold the leaf at night, whereas extensor cells swell and flexor cells shrink to straighten the pulvinus and extend the leaf in the daytime. These changes are caused by ion fluxes primarily of potassium and chloride, across the plasma membrane of the motor cells. These ion fluxes are regulated by exogenous light signals and an endogenous biolgical clock. Inward-directed K$^+$ channels are closed in extensor and open in flexor cells in the dark period, while these channels are open in extensor and closed in flexor cells in the light period. Blue light opens the closed K$^+$ channels in extensor and closes the open them in flexor cells during darkness. Illumination of red light followed by darkness induces to open the closed K$^+$ channels in flexor and to close the open K$^+$ channels in extensor cells in the light. The dynamics of K$^+$ channels in motor cells that are controlled by light signals are consistent with the behavior of the pulvini in intact plants. Therefore, these cell types are an attractive model system to elucidate regulations of ion transports and their signal transduction pathways in plants. This review is focused on light-controlled ion movements and regulatory mechanisms involved in phosphoinositide signaling in leaf movements in nyctinastic plants.

• The Plant Pathology Journal
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• 제30권2호
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• pp.151-158
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• 2014

Three double-stranded RNAs (dsRNAs), approximately 1.85, 1.65 and 1.27 kb in size, were detected in an isolate of Cytospora sacchari from Iran. Partial nucleotide sequence revealed a 1,284 bp segment containing one ORF that potentially encodes a 405 aa protein. This protein contains conserved motifs related to RNA dependent RNA polymerases (RdRp) that showed similarity to RdRps of partitiviruses. The results indicate that these dsRNAs represent a novel Partitivirus that we tentatively designate Cytospora sacchari partitivirus (CsPV). Treatment of the fungal strain by cyclohexamide and also hyphal tip culture had no effect on removing the putative virus. Phylogenetic analysis of putative RdRp of CsPV and other partitiviruses places CsPV as a member of the genus Partitivirus in the family Partitiviridae, and clustering with Aspergillus ochraceous virus 1.

• International Journal of Human Ecology
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• 제17권2호
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• pp.43-51
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• 2016

Even though gratitude is considered as an important virtue to possess for successful adulthood, little is known about what cultivates gratitude and its benefits associated with psychological well-being among adolescents. By examining gratitude as a daily mood, this study asked (1) whether adolescents' daily grateful mood varied as a function of daily parental emotional support and (2) whether adolescents' psychological well-being varied as a function of daily grateful mood within person across seven days. The sample consisted of 70 adolescents in 8th grade recruited from a public middle school. Participants completed daily diary checklists online each evening for seven days. On days when adolescents perceived greater parental emotional support from mother or father than they typically did during the week, they rated their grateful mood to be higher than other days. With more emotional support from father, adolescents reported more grateful mood not only on that day, but also the following day. While this result highlights the important role that parents play in adolescents' experience of grateful mood, emotionally supportive behaviors of fathers appear particularly promising for cultivating gratitude. Further, daily grateful mood on a given day accounted for the significant variance in adolescents' psychological well-being not only on the same day, but also the following day. Research and practical implications of the results are discussed.