Cobalt-mediated Radical Polymerization of Vinyl Acetate and Acrylonitrile with Poly(N-vinyl pyrrolidone) Macroinitiator End-capped by Cobalt(II) Acetylacetonate

전현정,육지호,Jeon, Hyun-Jeong,Youk, Ji-Ho The Korean Fiber Society 2010 한국섬유공학회지 Vol.47 No.6

Cobalt-mediated radical polymerization (CMRP) of vinyl acetate (VAc) and acrylonitrile (AN) with poly(N-vinyl pyrrolidone) macroinitiator end-capped by cobalt(II) acetylacetonate [PVP-$Co(acac)_2$] was conducted, and the effects of the polymerization temperature and the presence of electron-donating compounds on the block copolymer synthesis were investigated. PVP-$Co(acac)_2$ is sensitive to oxygen and should be stored in an inert atmosphere. The CMRP of VAc with the PVP-$Co(acac)_2$ macroinitiator did not proceed in a controlled manner probably due to the inefficient deactivation reaction between the growing PVP-b-PVAc radicals and $Co(acac)_2$. However, well-defined PVP-b-PAN could be synthesized in dimethyl sulfoxide at $15^{\circ}C$. The well-controlled process was evidenced by the linear relationship between ln($[M]_0$/[M]) vs. time.

코발트를 매개로 한 폴리비닐피발레이트 및 이의 블록 공중합체의 합성

전현정,박미선,박동민,유영창,육지호,Jeon, Hyun-Jeong,Park, Mi-Seon,Park, Dong-Min,You, Young-Chang,Youk, Ji-Ho 한국섬유공학회 2008 한국섬유공학회지 Vol.45 No.6

Controlled radical polymerization of vinyl pivalate (VPi) was achieved by cobalt-mediated radical polymerization (CMRP) using cobalt(II) acetylacetonate (Co$(acac)_2$) and 2,2'-azo-bis(4-methoxy-2,4-dimethylvaleronitrile) (V-70). Poly(vinyl pivalate) (PVPi) chains having controlled molecular weights and low polydispersities ($M_w/M_n$=1.05-1.29) were successfully synthesized. PVPi macroinitiator ($M_n$=11,100 g/mol, $M_w/M_n$=1.13), which was end-capped by Co$(acac)_2$ was used to successive CMRP of well-defined PVPi-b-poly(vinyl acetate) (PVPi-b-PVAc) and PVPi-b-poly(acrylonitrile) (PVPi-b-PAN) block copolymers at 30 DC. The polymerization of PVPi-b-PV Ac was performed via a degenerative chain transfer (DT) mechanism using an excess of V-70. PVPi-b-PAN was synthesized via a reversible termination (RT) mechanism in DMF.

주주제안권과 그 한계

전현정(Hyun Jeong Jeon) 한국법학원 2018 저스티스 Vol.- No.164

주주제안권이 도입된 지 거의 20년의 세월이 지났다. 주주제안권은 소수주주가 주주총회에서 심의할 의제나 의안을 제안할 수 있도록 함으로써, 주주총회의 의사결정에 주주를 참여하여 회사의 경영에 주주의 의사를 반영시키고자 한 것이다. 상법 제363조의 2 제3항에서 주주제안이 있는 경우에 이를 주주총회의 목적사항으로 해야 한다고 규정하고 있다. 그런데 주주제안이 된 내용이 그대로 주주총회에 상정되어야 하는지 문제된다. 즉, 주주제안권이 행사되었기 때문에 무조건 주주총회의 목적사항으로 삼아야 하는지, 아니면 주주제안권의 행사를 규제하거나 제한할 수 있는지 문제된다. 서로 양립 가능하지 않은 주주제안권이 행사되거나 논리적으로 선결되어야 할 문제를 생략한 채 주주제안권이 행사되는 경우 이사회는 주주제안의 본질적인 취지를 벗어나지 않는 범위 내에서 주주제안된 내용을 변형 상정할 수 있다고 보아야 한다. 이사회가 주주총회의 소집이나 진행 등의 운영을 맡고 있기 때문에, 주주제안권을 침해하지 않는 한도에서는 이사회가 주주총회를 효율적으로 운영할 수 있도록 하여야 한다. 한편 집중투표와 주주제안권은 별개의 문제로서, 주주총회에서 복수의 이사를 선출할 것이 확정되었을 때에 비로소 문제되는 것이다. 집중투표 청구 자체는 주주제안의 내용이 될 수 없음을 주의하여야 한다. 주주가 적법한 절차를 거쳐 주주제안을 하였는데도 이사회가 이를 거부한 경우, 주주총회결의의 효력은 원칙적으로 주주제안이 의안제안인지 의제제안인지에 따라 달라진다. 의안제안의 경우에는 주주총회결의 취소 사유가 있다고 볼 수 있지만, 의제제안의 경우에는 그에 상응하는 결의가 없기 때문에 취소 사유가 없다고 보아야 한다. 다만, 의제제안의 내용이 주주총회에서 이루어진 다른 의제에 대해 전제관계에 있고, 전제로 되는 의제제안의 부당거절이 없다면 다른 의제에 대한 결의가 달라질 가능성이 있는 경우에는 그 결의는 취소 사유가 있다고 보아야 한다. 한편 적법한 한도에서 변형 상정이 되었다면 주주제안권이 침해되었다고 볼 것은 아니다. 현재 실무에서는 주주제안된 내용이 그대로 주주총회의 안건으로 상정되어야만 주주제안권이 침해되지 않는다고 보는 경향이 있다. 그러나 이것은 주주제안권을 지나치게 평면적으로 이해한 것이다. 소수주주가 회사의 의사결정에 실질적으로 참여하는 것을 보장하면서도 주주총회의 공정하고 효율적인 운영이 가능하도록 주주제안권의 행사를 적절하게 규율할 필요가 있다. The shareholder proposal right in Korea was introduced nearly 20 years ago to protect the interests of minority shareholders. This right allows minority shareholders to propose agendas or agenda items that require a resolution of the general shareholders meeting and thereby provides opportunities for minority shareholders to participate in company management.106) Under Article 363-2(3) of the Korean Commercial Code, minority shareholders can participate in the decision making process of the company since they are granted the right to submit proposals for consideration at the general shareholders meeting. If the relevant proposal is not considered, whether this infringes upon the shareholders’ rights becomes an issue. In other words, whether the submitted proposal should be included as an item of the agenda since minority shareholders have exercised their right, or by what means can the right be limited and restricted, can become problematic. In most cases, compared with the matters that are dealt with at the general shareholders meeting, minority shareholders submit inconsistent proposals or fail to deal with matters that should have been decided before the submission of the proposals. For these cases, the board of directors can make decisions to amend the minority shareholders’ proposed agenda to the extent that the amendment does not alter the original intent of the proposal. Since the board convenes and conducts the general shareholders meeting, they should be able to make decisions for the efficient conduct of the meeting. The boards’ convening and conducting of the general shareholders meeting, of course, assumes that the minority shareholders’ proposal rights are not infringed upon. In this regard, however, cumulative voting and shareholder proposal are separate matters and become an issue when a decision to elect multiple directors becomes necessary. A cautionary note is that cumulative voting itself cannot be the content of a shareholder proposal. If a shareholder proposal was legitimately made by the shareholders but the board of directors rejects the proposal, then the resolution of the general shareholders meeting may be nullified. Here, the distinction is drawn between whether the proposal was for agendas or agenda items. For shareholder proposals for agenda items, there may be grounds to cancel the resolution adopted at the general shareholders meeting. On the other hand, for proposals for agendas, there are no grounds for cancellation since no resolution similar to the resolutions adopted for agenda items is adopted for agendas. However, if a proposal for an agenda constitutes a prerequisite for another agenda at a general shareholders meeting and if there was a possibility that a resolution relating to such other agenda adopted at such meeting would not have been adopted absent unreasonable refusal of the proposal for the agenda, there may be grounds to cancel the resolution adopted for such other agenda. Having said that, if the agenda was modified within a certain legal framework, then this should not be viewed as an infringement on the shareholder proposal rights. In practice, however, most hold the view that the proposal of shareholders must be presented without modification at the general shareholders meeting as agenda in order for the proposal rights to be preserved. This view is an overly one dimensional understanding of the shareholder proposal right. This paper highlights the necessity of regulating minority shareholders’ rights to a certain extent in order to hold fair and efficient general shareholders meetings. The author argues that a balance between protection of minority shareholders’ right to participate in the decision making process of the company and efficient conduct of the general shareholders meetings is attainable.

제2형 당뇨병 환자에서 케모카인 수용체 유전자 다형성과 당뇨병성 신증과의 연관성

전현정 ( Hyun Jeong Jeon ),김옥희 ( Oak Hee Kim ),오태근 ( Tae Keun Oh ) 대한내과학회 2008 대한내과학회지 Vol.75 No.4

목적: 케모카인 수용체 5번은 대표적인 케모카인 수용체 중의 하나로, 정상 T 세포들의 발현 및 분비 등을 조절하는 케모카인(RANTES), MIP-1α, MIP-1β과 결합하여, 단핵세포 및 대식세포 침윤을 증가시켜 염증반응에 관여하는 것으로 알려져 있으며, 또한 죽상경화증 발생에도 영향을 미치는 것으로 보고되고 있다. 케모카인 수용체 5번 유전자 다형성과 당뇨병성 신증과의 연관성이 보고되고 있으나, 현재까지는 명확한 결론이 나와 있지 않으며, 당뇨병성 합병증에 대한 연관성 역시 잘 알려져 있지 않다. 이에 저자들은 이환 기간이 10년 이상된 제2형 당뇨병 환자에서 케모카인 수용체 5번(59029A/G) 유전자 다형성과 당뇨병성 합병증과의 연관성을 알아보고자 하였다. 방법: 대상 환자는 제2형 당뇨병 환자 325명으로 구성되었다. 케모카인 수용체 5번(59029A/G) 유전자 다형성은 PCR 및 Bsp1286I 제한효소 처리에 의하여 분석하였고, 대상환자들의 임상적인 특성과 생화학적 특성을 비교 관찰하였다. 당뇨병성 신증, 망막증과 대혈관 합병증과의 연관성을 조사하였다. 결과: 당뇨병성 신증에 따른 케모카인 수용체 5번(59029A/G) 유전자형의 빈도의 차이는 관찰되지 않았다. 남녀 성별에 따른 차이도 관찰되지 않았다. 당뇨병성 신증 이외에 다른 합병증으로 당뇨병성 망막증과 대혈관 합병증에 따른 케모카인 수용체 5번(59029A/G) 유전자형의 빈도 역시 차이가 관찰되지 않았다. 케모카인 수용체 5번(59029A/G) 유전자형에 따른 임상적 비교에서는 당뇨병성 신증이 발생한 군에서 GG형이 AA/AG형에 비해 저밀도 콜레스테롤이 높은 것으로 관찰되었다. 결론: 케모카인 수용체 5번(59029A/G) 유전자 다형성과 당뇨병성 합병증과의 연관성은 관찰되지 않았다. 그러나 케모카인 수용체 5번(59029A/G) 유전자 다형성과 당뇨병성 합병증과의 연관성과 발생기전을 정확히 파악하기 위해서는 대단위 규모의 연구가 필요할 것으로 여겨진다. Background/Aims: Chemokine receptor 5 (CCR5) is a receptor for several chemokines, including regulated upon activation, normal T-cell-expressed and -secreted (RANTES; also known as CCL5) and macrophage inflammatory protein 1 (MIP-1), and mediates the recruitment of monocytes and their differentiation to macrophages during the inflammatory process. As such, CCR5 plays an important role in the development and progression of atherosclerosis, which has an underlying inflammation component and contributes to the development or progression of diabetic complications. Several studies have reported that a genetic variation of the CCR5 gene with A/G at basepair 59029 (59029 A/G) was associated with diabetic complications, although conflicting data exist. We evaluated the association of the CCR5 59029 A/G polymorphism with diabetic complications in type 2 diabetes patients. Methods: We conducted a case-control study, enrolling 325 patients with type 2 diabetes. We examined the association of CCR5 genotypic variations with diabetic nephropathy, retinopathy, and macrovascular complications such as coronary heart disease and stroke. Genotyping was performed using the polymerase chain reaction and restriction fragment length polymorphism technology with Bsp1286I restriction enzyme. Results: We determined no allelic association of CCR5 59029 A/G with diabetic nephropathy (p=0.500) in the male or female patients. Diabetic retinopathy and macrovascular complications such as coronary heart disease and stroke were not associated with the 59029 A/G polymorphism. Among those patients with diabetic nephropathies, those with the GG genotype showed a tendency toward higher serum levels of LDL-cholesterol. Conclusions: These results suggest that that the 59029 A/G polymorphism of the CCR5 gene is not associated with diabetic complications in type 2 diabetes patients. Further studies are required to understand the role of CCR5 polymorphisms in the development of diabetic complications. (Korean J Med 75:428-435, 2008)

대안적 초등교육과정 개발 방향 탐색 : Egan의 이야기 형식 모형을 중심으로

전현정 ( Hyun Jeong Jeon ),강현석 ( Hyeon Suk Kang ) 한국초등교육학회 2009 초등교육연구 Vol.22 No.1

내러티브 중심의 교육과정 재구성 방향 탐색

전현정 ( Hyun Jeong Jeon ),강현석 ( Hyeon Suk Kang ) 한국교육철학회 2011 교육철학 Vol.44 No.-

The purposes of this study is to understand the concepts and needs of the narrative thinking style and to provide the basic lines of narrative-oriented curriculum reconstruction and diverse options for the reconstruction. For those purposes, the research tasks are as follows.: First, the theoretical base of narrative and curriculum reconstruction are discussed. Second, the basic matters of narrative-based curriculum reconstruction is investigated based on the teacher`s narrative and individual and practical knowledge. Third, based on the two tasks above, three lines of narrative-based curriculum reconstruction are constructed. Using the interpretive framework to decide which perspective would be taken in analyzing the curriculum throughout all the stages of curriculum reconstruction, three lines were summarized as follows.: First, the curriculum potential is the implementing the value of curriculum itself and refers to the strategy to perceive and conceive the capacity of curriculum materials differently according to the teachers` individual knowledge. Second, the curriculum interpretation is meaning making of curriculum and focuses on the construction of the meanings of each curriculum material differently according to the teachers` individual knowledge and experience. Third, action research will exert meaningful impacts on the teachers` reflection on their own lessons and their improvement efforts, as well as the curriculum reconstruction.

은 나노입자를 함유한 폴리우레탄 나노섬유 매트의 제조

김문희,전현정,홍지혜,정은환,육지호,Jin Wen-Ji,Jeon Hyun-Jeong,Hong Ji-Hye,Jeong Eun-Hwan,Youk Ji-Ho 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.1

Poly(urethane)(PU) nanofibers containing silver nanoparticles were prepared via a simple one-step method. PU was dissolved in DMAc/THF(7/3 w/w) with a small amount of $AgNO_3.Ag^+$ ions in the PU solution were reduced by DMAc into Ag nanoparticles, which was confirmed by UV-vis spectroscopy and TEM analysis. DMAc was used as a solvent for PU as well as a reducing agent for the Ag+ ions. The resulting solutions were directly electrospun into PU nanofibers. The Ag nanoparticles were all sphere shaped and evenly distributed in the PU nanofibers. The average sizes of Ag nanoparticles in PU nanofibers electro spun with 0.2 and 0.5 wt% $AgNO_3$ were 3.6 and 4.0 nm, respectively.

당뇨병(糖尿病)의 원인(原因)과 증상(症狀)에 대한 동서양(東西洋)의 병기론적(病機論的) 접근(接近) 및 동(東),서양(西洋),대체의학적(代替醫學的) 치료연구(治療硏究)

황우준,전현정,Hwang, Woo-Jun,Jeon, Hyun-jeong 대한한의정보학회 2005 大韓韓醫情報學會誌 Vol.11 No.1

A symptoms of Diabetic is finded in many recordes, that is said to Diabetic or dryness or migratory arthralgia or flaccid paralysis of limb or abscess or arthralgia, but Diabetic is most closely symptom. So, study the 3-symptoms of Diabetes mellituscause, thses are polyuria and polyphasia and thirst, and this is similar symptoms of So-gal. So, bibliographic study or pathological approach of symptoms of So-gal, and So-gal in oriental medicine has come to the following conclution. The symptoms of So-gal is polyuria and polyphasia and thirst, is due to Simsinbulgyo, that is mean to breakdown of the normal physiological coordination between the heart and the kidney. A thirst is due to heat-transformation have an effect to the upper energizer and the heart and the lung and the stomach in Simsinbulgyo. A polyuria is due to failure of the kidneys Yang, that is due to failure of Yang of the heart in Simsinbulgyo.

Uniaxial Drawing Behavior of Electrospun Poly(ethylene terephthalate) Fibers

백치경,전현정,육지호,Baek, Chi-Kyoung,Jeon, Hyun-Jeong,Youk, Ji-Ho The Korean Fiber Society 2007 한국섬유공학회지 Vol.44 No.5

The morphological change and molecular orientation of electrospun ultrafine poly(ethylene terephthalate) (PET) fibers were investigated during uniaxial drawing. The average diameters of the ultrafine PET fibers electrospun from 8, 10, and 12 wt% PET solutions were 220, 450, and 1600nm, respectively. The ultrafine PET fibers were drawn inhomogeneously with multiple necking deformations at $25^{\circ}C$, whereas they could be homogeneously drawn without necking at $75^{\circ}C$. The orientation of the PET chains in the ultrafine PET fibers readily proceeded when drawn at $25^{\circ}C$ via necking deformation. By comparing the fractions of the trans conformer of the ultrafine PET fibers and the amorphous PET films (ref. 14, 15), it was found that the orientation of PET chains more readily proceeded in the ultrafine PET fibers than in the amorphous PET films.

증례 : 당뇨병 환자에서 아스페르길루스증과 병발된 방선균증 1예

이정화 ( Jeong Hwa Lee ),이장은 ( Jang Eun Lee ),양승아 ( Seung Ah Yang ),전현정 ( Hyun Jeong Jeon ) 대한내과학회 2007 대한내과학회지 Vol.72 No.1S