대규모 집단의 이익표출 과정 재고찰:2018-2020 한국유치원총연합 사태 내에서 ‘정치하는엄마들’을 중심으로

유승준,류석진 한양대학교 평화연구소 2020 문화와 정치 Vol.7 No.3

This study aims to analyze the mobilization process of ‘political mamas,’ a large non-governmental organization founded in 2017, with the lens of interest group politics. Unlike the conventional wisdom that a small-sized economic group is more efficient in affecting policy outcomes, ‘political mamas’ has successfully mobilized individuals by building a strong common objective — strengthening the public value of kindergarten education — among parents, lowering the entrance cost via online participatory platforms and implementing a horizontal network that ensures an equal opportunity to all members, thus encouraging their active participation. These unique mechanisms have contributed to overcoming innate difficulties that a large-sized group often faces such as free-riding problem. These findings have significant implications for the understanding of how individuals, often called as ‘forgotten groups,’ manage to mobilize and therefore increase their legislative voice. This case study not only calls traditional collective action theories into a question but suggests the possibility of a new theoretical approach to understand the Korean interest group politics. 본 논문은 2018-2020 한국유치원총연합(한유총) 사태를 소규모 집단(특권적 집단)과 대규모 집단(잠재적 집단)의 갈등으로 논의를 재조명하여 ‘정치하는엄마 들’이라는 학부모 집단 조직화를 규명하는 데 목적이 있다. 선택적 유인이 낮을 뿐 아니라, 특권적 소규모 집단에 비해 조직화가 어려운 학부모 집단은 기존 집합행동 이론이 설명하는 대규모 집단의 한계를 극복하면서 조직화에 성공했 다. ‘정치하는엄마들’의 출현은 세 가지 요인을 통해 가능했다. 첫째, 학부모들 은 ‘유치원 교육의 공공성 강화’라는 강력한 공통적 이익을 구축했다. 이는 한 국 유치원 교육과 시설의 성격 불일치라는 특수한 배경에 근거한다. 둘째, 온라 인 커뮤니티를 활용하여 개인의 참여비용을 대폭 감소시켰다. 집단 참여비용의 감소는 개인의 참여 가능성을 높이고 구성원 간의 연대의식과 같은 비물질적 이익을 강화했다. 셋째, 수평적 회원제도와 민주적 절차에 입각한 운영위원회 구성이다. 소수 구성원이 아닌 다수가 의제를 설정하고 구성원이 동등한 기회를 부여하면서 집단 유지를 위해 필수적인 무임승차 즉, 집합행동의 딜레마를 극복 할 수 있었다.

Adsorption behavior of phosphate on 2-L ferrihydrite adsorbent predicted by partial charge model under varying pH conditions

유승준 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.8

The surface charge of the adsorbent 2-L ferrihydrite was calculated by the partial charge model for varyingpH conditions. The value of the surface charge was used to predict the ability of the adsorbent to chemically adsorband desorb the adsorbate. The crystal structure of the 2-L ferrihydrite material was regarded as two models: an exclusivelyoctahedral model and a combined model comprising 20% tetrahedra and 80% octahedra. The partial chargemodel was used to calculate the surface charge of the adsorbent under varying pH conditions. In the exclusively octahedralmodel, the surface charge reached the highest value of +0.060 under acidic conditions, 0.088 in the neutralstate, and the lowest value of 0.347 under alkaline conditions. In the case of the combined model, (OH) had thehighest value of +0.056 under acidic conditions, 0.087 in the neutral state, and the lowest value of 0.332 under alkalineconditions. As a result, we confirmed that the surface charge of the adsorbent could have a positive value even inan acidic environment. That is, the surface charge of the adsorbent could become positive or negative according to thepH of the solution. In a solution in which the pH is below 10, the adsorbent could adsorb the negative phosphatebecause the (OH) would be positive. In contrast, in a solution with pH>10, the adsorbent could desorb the negativephosphate because the (OH) would be negative.

고기능성 황토타일의 제조에 관한 연구

유승준,이세일,김석종,이민재 한국공업화학회 2004 한국공업화학회 연구논문 초록집 Vol.2004 No.1

Synthesis of mesoporous 2-line ferrihydrite/γ-Al2O3 hybrid adsorbent for the effective adsorption of phosphate for water remediation

유승준 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.2

2-line ferrihydrite/γ-Al2O3 hybrid adsorbent (Fh/γ-Al2O3 hybrid adsorbent) precipitated on 10 wt% of γ- Al2O3 seed for the effective adsorption of phosphate in water was synthesized from wastewater containing ferric sulfate. The use of γ-Al2O3 seeds for particle initiation made it possible to prepare larger particles that would allow a liquid to flow through. The synthesized Fh/γ-Al2O3 hybrid adsorbent was characterized by X-ray diffraction, 27Al-MAS NMR, N2 adsorption/desorption, SEM analysis, and EpHL measurements. The adsorption performance of phosphate on the synthesized Fh/γ-Al2O3 hybrid adsorbent was evaluated by batch and column tests at phosphate concentration below 10 ppm, which corresponds to the actual phosphate concentration of natural systems. The adsorption mechanism suggested by the batch test was in good agreement with the Langmuir adsorption model, with a maximum adsorption capacity of 33.2mg/g. On the other hand, the experiment with the column obtained a maximum adsorption capacity of 33.6mg/g for a volumetric flow rate of 10.25 BV/min and an influent phosphate concentration of 4.75 ppm on 0.5 g of adsorbent. The Fh/γ-Al2O3 hybrid adsorbent was shown to have superior adsorption characteristics to those of other previous research in terms of cost, adsorption efficiency, contact time, maximum adsorption capacity, and desorption efficiency of 95% from the experimental condition based on the surface characterization of the adsorbent.

Correlation of charge mobility with energetic disorder of host molecules in p-doped disordered organic semiconductors

유승준,이정환,김재민,김장주 한국고분자학회 2015 한국고분자학회 학술대회 연구논문 초록집 Vol.2015 No.4

경골어류 난태생 송사리과에 속하는 black molly와 sailfin molly의 정자형성과정

유승준,김동희,Ryu, Seung-Jun,Kim, Dong-Heui 한국현미경학회 2010 Applied microscopy Vol.40 No.3

난태생어류인 성숙한 블랙몰리(black molly, Poecilia sphenops)와 세일핀몰리(sailfin molly, Poecilia latipinna)의 정소를 적출하여 정자형성과정과 정자의 미세구조를 광학현미경과 전자현미경을 이용하여 관찰하였다. 정소는 부레와 창자사이에 위치하고 있었고 장축 7 mm, 단축 2 mm 정도의 크기로 흰색을 띠고 있었다. 두 종 모두 정자형성 과정은 정소낭(testicular cyst)에서 이루어졌으며, 각 정소낭 내에 동일한 분화시기의 생식세포가 분포하고 있었다. 제1정모세포는 타원형으로 관찰되었으며, 핵과 세포질의 전자밀도는 다른 생식 세포들에 비해서 매우 낮았고 미토콘드리아는 핵막주위에 분포하고 있었다. 제2감수분열 전기의 태사기에 나타나는 태기사복합체(synaptonemal complex)들이 확인되는 경우도 있었다. 두 종 모두 제2정모세포는 구형으로 정원세포보다 크기는 작았고 인은 발달되어 있지 않았으며, 핵의 전자밀도는 더 높아졌다. 특히 미토콘드리아는 세포질 전체에 분포하고 있었고 정세포가 정자로 발달하는 정자완성과정시기에 편모가 형성되는 경우가 일반적이지만 이미 제2정모 세포시기에 편모형성이 관찰되었다. 정자의 중편부위를 횡단한 결과 미토콘드리아는 2~4개 정도로 관찰되었고 편모의 미세소관 배열은 전형적인 두 종 모두 9+2 구조를 이루고 있었고 편모에 lateral fin이 발견되었다. 성숙한 정자의 두부형태는 구형인 정세포와 달리 장원추형이었으며 염색질 응축이 매우 뚜렷하였고, 두부에서 첨체는 관찰되지 않았으며 중편부의 미토콘드리아는 두 종 모두 8~10개가 종렬로 위치하고 있었다. 이상과 같이 두 종의 정자형성과정과 정자의 형태는 같으며 이런 특징은 난태생 송사리과 어류의 공통적인 특성으로 생각된다. Black molly (Poecilia sphenops) and sailfin molly (Poecilia latipinna) are a teleost belonging to Poeciliidae. The spermatogenesis between two species were investigated by light and electron microscope. The whitish testes of both black molly and sailfin molly were located between intestine and air bladder. The size of testis was major axis 7 mm, minor axis 2 mm. The testis contained numerous testicular cysts. In both black molly and sailfin, primary spermatocytes were comparatively large ellipsoidal, and mitochondria showed a marked development. The secondary spermatocyte was smaller than that of primary spermatocyte, highly condensed according to their development. The nucleus with electron-dense was round shape and flagella started to be formed. In spermiogenesis, chromatin was more condensed. The mitochondria were rearranged along the tail. The number of mitochondria was 2 to 4 in cross section and 8 to 10 in longitudinal section. The head of mature sperm was long cone shape and had not acrosome. The microtubules of flagella were arranged 9+2 structure. Also, the tail of sperm have lateral fins. In conclusion, spermatogenesis and sperm morphologies of these two species were same. These morphological similarity seems to be an indication of the Poeciliidae.

Synthesis of aluminum isopropoxide from aluminum dross

유승준,이세일,윤호성,전기원,Hee Dong Jang,Jung-Woon Lee,Seung-Tae Hong,Min-Jae Lee 한국화학공학회 2006 Korean Journal of Chemical Engineering Vol.23 No.4

Bone Mineral Density Changes after Orchiectomy using a Scrotal Approach in Rats

유승준,류다성,김종열,박정윤,김경현,진동규,김근수,조용은,구성욱 대한척추신경외과학회 2015 Neurospine Vol.12 No.2

Objective: To investigate a suitable animal model for studies of male osteoporosis. Osteoporosis has a particularly high incidence in postmenopausal women, resulting in a substantial amount of research with respect to this disease in women. However, research on osteoporosis in men is still lacking. Methods: Twenty 10-week-old male Sprague Dawley rats were used in this study, including 4 rats used to establish a baseline bone mineral density (BMD). The other 16 rats were divided into two groups: a sham surgery group (n=8), which underwent a sham operation, and an orchiectomized rat group (OCX) (n=8), which underwent bilateral OCX at 10 weeks of age. Bone mineral density was measured in 4 rats from both the sham surgery group and the OCX group 8 weeks after the surgery, while BMD in the remainder of the rats was measured 10 weeks post-surgery. Results: Femoral BMD at 8 weeks post-surgery was found to be significantly lower in the OCX group compared to the sham group; a finding that was also similar 10 weeks post-surgery. Conclusion: 8 weeks after undergoing orchiectomy performed via a scrotal, white rats are a suitable model for studies of male osteoporosis.

Hole mobility in p-doped organic molecules with widely varying doping concentration

유승준,이재현,이정환,김장주 한국고분자학회 2011 한국고분자학회 학술대회 연구논문 초록집 Vol.2011 No.1

Protective Effects of Inducible HO-1 on Oxygen Toxicity in Rat Brain Endothelial Microvessel Cells

유승준,Neal K. Nakra,Gabriele V. Ronnett,문제일 대한내분비학회 2014 Endocrinology and metabolism Vol.29 No.3

Background: Reperfusion in ischemia is believed to generate cytotoxic oxidative stress, which mediates reperfusion injury. These stress conditions can initiate lipid peroxidation and damage to proteins, as well as promote DNA strand breaks. As biliverdin and bilirubin produced by heme oxygenase isoform 1 (HO-1) have antioxidant properties, the production of both antioxidants by HO-1 may help increase the resistance of the ischemic brain to oxidative stress. In the present study, the survival effect of HO-1 was confirmed using hemin. Methods: To confirm the roles of HO-1, carbon monoxide, and cyclic guanosine monophosphate further in the antioxidant effect of HO-1 and bilirubin, cells were treated with cycloheximide, desferoxamine, and zinc deuteroporphyrin IX 2,4 bis glycol, respectively. Results: HO-1 itself acted as an antioxidant. Furthermore, iron, rather than carbon monoxide, was involved in the HO-1-mediated survival effect. HO-1 activity was also important in providing bilirubin as an antioxidant. Conclusion: Our results suggested that HO-1 helped to increase the resistance of the ischemic brain to oxidative stress.