• Title/Summary/Keyword: SK1

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적대적 M&A에 대한 방어(1)

  • 엄재민
    • 벤처다이제스트
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    • 통권103호
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    • pp.26-27
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    • 2007
  • 최근 이른바 '장하성 펀드'가 대한화섬 지분을 매집한 후 경영진에 지배구조개선을 요구하면서 주식시장에서 대한화섬의 주가는 상승세를 계속했다. 또한 지난 해 초순에는 세계적인 '기업사냥꾼' 칼 아이칸(Carl Icahn)이 KT&G 지분을 매집하면서 사회적 관심을 모으기도 했다. 무엇보다도, 국민들에게서 적대적 M&A에 대한 인식을 각인시킨 계기는 2003년 3월 소버린 펀드가 분식회계 파장을 계기로 주가가 급락한 (주)SK 주식을 매입하면서부터일 것이다. 당시 소버린 펀드는 불과 2개월만에 (주)SK 주식 14.99%를 매입하였고 우호지분을 규합하여 당시 최태원 회장의 교체를 시도하겠다고 선언하였다. 종국적으로 주주총회에서의 의결권 대결은 당시 (주)SK의 승리로 끝났지만, 그 기간 동안 (주)SK 주가는 고공행진을 계속하였고, 소버린 펀드는 2005년 7월 무려 8,000억 원의 주식 양도차익을 남기고 유유히 시장을 떠났다. 이번 호와 다음 호에서는 2회에 걸쳐 이와 같이 뜨거운 사회적 관심을 모으고 있는 적대적 M&A에 대해 살펴 보고, 이에 대한 방어 방법을 검토해 보고자 한다.

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신규항암제인 Heptaplatin의 인체 흑색종세포(SK-MEL-28)에 대한 세포생존률 및 유세포 분석 (Cell Viability and Flow Cytometry Analysis of a Novel Antitumor Agent, Heptaplatin in Human Melanoma Cell Line, SK-MEL-28)

  • 최수라;명평근
    • 약학회지
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    • 제47권6호
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    • pp.345-351
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    • 2003
  • Heptaplatin, cis-Malonato[(4R,5R)-4,5-bis(aminomethyl)-2-isopropyl-1,3-dioxolane]platinum(II), is a novel platinum-based antitumor agent with clinical potential against human stomach cancer and the 3rd generation of the cisplatin. This study was performed to study how cisplain, heptaplatin and sunpla which is a mixture of heptaplatin and mannitol (w: w=l : 2) affect cell viability of SK-MEL-28 human melanoma cell line. Heptaplatin ($IC_{50}$/; 95.35 $\mu$M) and sunpla ($IC_{50}$/; 10.95 11M) were less effect than cisplatin (IC $_{50}$; 10.92 $\mu$M) on the SK-MEL-28 cells. By cell cycle analysis using flow cytometry, it was identified that the cells were arrested at G2/M phase by cisplatin, heptaplatin and sunpla, and percentage of cell death group was increased according to increasing of time and concentration. These results suggest that cisplatin, heptaplatin and sunpla are a novel anticancer agent against human melanoma cell.l.

망장비에 독립적인 망관리대행자 구축 및 관리방안 연구 (The study on the independent agent for network elements)

  • 고종국;김지선;김성
    • 한국정보통신설비학회:학술대회논문집
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    • 한국정보통신설비학회 2005년도 하계학술대회
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    • pp.16-21
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    • 2005
  • SK텔레콤은 1984년 차량전화서비스를 개시한 이래로 무선호출서비스, 아날로그 이동전화 서비스, CDMA 이동전화서비스, CDMA2000 1X/EV-DO 및 WCDMA서비스를 위한 이동통신망들을 연이어 구축해 왔다. 이러한 다양한 서비스 통신망을 구성하는 많은 망장비들을 관리하기 위해 통신망에 대한 망관리시스템 구축은 필수적이었고, 다양한 방식으로 망관리시스템 구축이 시도되었다. 비교적 짧은 기간내 통신망을 구축, 확대하고, 새로운 이동통신망을 도입하면서 기존망과 연동시키는 일들은 망장비에 대한 빈번한 패키지 변경을 낳았고, 이는 특히 망장비로부터 망관리 정보를 수집하고 망관리시스템으로의 보고를 담당하는 망관리대행자(Agent)의 안정성 및 유지보수 문제를 야기시켰다. 이에 본 논문에서는 기존에 개발되었던 망관리대행자들이 가지고 있던 다양한 문제점들을 제시하고 이를 해결하기 위한 망관리대행자에 대한 새로운 구축방안을 제시한다

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인삼(Panax ginseng) 열매로부터 분리한 ginsenoside의 동정 및 암세포독성 효과 (Ginsenosides from the fruits of Panax ginseng and their cytotoxic effects on human cancer cell lines)

  • 곽정은;이영근;황보전;김형근;오선민;이대영;백남인
    • Journal of Applied Biological Chemistry
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    • 제61권4호
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    • pp.371-377
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    • 2018
  • 인삼(Panax. ginseng) 열매를 80% MeOH 수용액으로 3회 반복 추출한 뒤, 감압 농축한 추출물을 EtOAc, n-BuOH과 $H_2O$ 층으로 계통 분획을 실시하였다. EtOAc분획에 대하여 $SiO_2$ 및 ODS column chromatography를 반복실시하여 5종의 ginsenoside 화합물을 분리 및 정제하였다. NMR, IR, FAB/MS 데이터를 해석하여, 각각 ginsenoside F1 (1), ginsenoside F2 (2), ginsenpside F3 (3), ginsenoside Ia (4) 및 notoginsenoside Fe (5)로 구조 동정 하였다. 화합물 2-5는 인삼열매에서는 이번에 처음 분리 보고되었다. 분리한 5종의 화합물을 인체 암세포주(HCT-116, SK-OV-3, HeLa, HepG2, SK-MEL-5)에 처리하여 세포독성을 측정하였다. 이 중 화합물 2, 4, 및 5가 인체 암세포주에 대해 세포독성을 저해시키는 것을 알 수 있었다. 화합물 2는 SK-MEL-5, HepG2, HeLa세포에서 $IC_{50}$값이 82.8, 86.8, $78.3{\mu}M$로 확인되었다. 화합물 4는 HCT-116, SK-MEL-5, SK-OV-3, HepG2, HeLa 세포에서 $IC_{50}$ 값이 24.5, 25.4, 26.3, 22.0, $24.9{\mu}M$로 확인되었다. 화합물 5는 SK-MEL-5 세포에서 $IC_{50}$ 값이 $81.7{\mu}M$로 확인되었다. 인삼 열매에서 분리한 화합물2, 4, 및 5가 암세포주에 대해 강한 세포독성을 나타내는 것을 확인하였으며, 이 화합물들은 공통적으로 3번 수산기에 glucopyranose를 가지고 있음을 확인하였다.

Characteristics of the Alcoholic Milk Product Fermented by Lactococcus lactis subsp. lactis TA29 and Saccharomyces exiguus SK2

  • Hong, Seok-San;Cha, Seong-Kwan;Kim, Wang-June;Koo, Young-Jo
    • Journal of Microbiology and Biotechnology
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    • 제6권1호
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    • pp.50-53
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    • 1996
  • A cultured milk product was made by fennenting 10$\%$ reconstituted skim milk with Lactococcus lactis subsp. lactis TA29 and Saccharomyces exiguus SK2. L. lactis TA29 and S. exiguus SK2 grew up to 1.0 $\times 10^9\;and\;2.0 \times 10^6$ cfu/ml, respectively. After the fermentation 21$\%$ of lactose was hydrolyzed, pH was lowered to 4.2, and titratable acidity and alcohol concentration were increased to 0.96 and 0.023$\%$, respectively. When the fermented milk was stored at $4{\circ}C$ for 9 days, the viable cell counts for L. lactis TA29 and S. exiguus SK2 were $6.5 \times 10^5\;and\;1.6 \times 10^6$ cfu/rnl, respectively. The alcoholic fermented milk prepared in this experiment was more inhibitory against some pathogenic bacteria including C. perfringens than commercial yoghurt products tested.

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Immunogenicity and safety of a 12-valent pneumococcal conjugate vaccine in infants aged 6-10 weeks: a randomized double-blind active-controlled trial

  • Shin, Jonghoon;Teeratakulpisarn, Jamaree;Puthanakit, Thanyawee;Theerawit, Tuangtip;Ryu, Ji Hwa;Shin, Jinhwan;Lee, Seulgi;Lee, Hayoung;An, Kyungjun;Kim, Hun
    • Clinical and Experimental Pediatrics
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    • 제63권7호
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    • pp.265-271
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    • 2020
  • Background: Pneumococcal diseases among children aged <5 years worldwide are associated with high annual mortality rates. Purpose: This study aimed to evaluate the immunogenicity and safety of GBP411, a 12-valent pneumococcal conjugant vaccine, with a dosing schedule of 2 primary doses plus 1 booster dose (2p+1) in healthy infants. Methods: This randomized active-controlled (Prevnar 13) double-blind phase 2 trial enrolled healthy subjects aged 6-10 weeks. Three serum concentrations of pneumococcal serotype-specific immunoglobulin G (IgG) were evaluated using the pneumococcal serotype-specific pneumonia polysaccharide enzyme-linked immunosorbent assay at 1 month after the primary doses and before and 1 month after the booster dose. The pneumococcal serotype-specific IgG titer was evaluated using a multiplex opsonophagocytic assay in a subset of 15 subjects per group. Results: After administration of the primary doses, the proportion of subjects who achieved pneumococcal serotype-specific IgG concentrations of >0.35 ㎍/mL was lower for some serotypes in the GBP411 group than in the comparator group (6B: 20.83% vs. 39.22%, P=0.047 and 19A: 58.33% vs. 90.20%, P<0.001). However, after administration of the booster dose, >97% of the subjects in each group achieved IgG concentrations of ≥0.35 ㎍/mL for all 12 serotypes. Increased immunogenicity was observed for some serotypes that showed significant intergroup differences after administration of the primary doses but not after the booster dose. We also found no significant intergroup difference in the overall incidence of solicited local adverse events. Furthermore, the overall incidence of solicited systemic adverse events was significantly lower in the GBP411 group than in the comparator vaccine group (79.59% vs. 98.04%; P=0.003). Conclusion: The GBP411 vaccine with a dosing schedule of 2p+1 may be immunogenic and safe for healthy infants.

Water Extract of Samultang Reduces Apoptotic Cell Death by $H_2O_2$-Induced Oxidative Injury in SK-N-MC Cells

  • Lee, Gyoung-Wan;Kim, Min-Sun
    • The Korean Journal of Physiology and Pharmacology
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    • 제13권3호
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    • pp.139-145
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    • 2009
  • The purpose of this study was to evaluate the effects of the water extract of Samultang (SMT), a Chinese herb, on apoptotic cell death by $H_2O_2$-induced oxidative stress in SK-N-M C cells. A nuclear fragmentation was observed via fluorescence imaging 12 h after exposure to 30 ${\mu}M$ $H_2O_2$ and DNA laddering was detected via agarose electrophoresis gel. In addition, increases in sub-G1 phase and cleavage of the PARP protein were observed. However, treatment with SMT for 2 h prior to $H_2O_2$ exposure significantly reduced apoptotic cell death induced by incubation with 30 ${\mu}M$ $H_2O_2$ in SK-N-MC cells. Pre-incubation with water extract of SMT for 2 h prevented the $H_2O_2$-induced decrease in mitochondrial transmembrane potential. SMT also attenuated the increase in caspase-3 activity and the breakdown of PARP protein caused by $H_2O_2$-induced oxidative stress. These results suggest that the water extract of SMT provides inhibition of apoptotic cell death against oxidative injury in SK-N-MC cells.

Solid State Drive(SSD)에 대한 가속열화시험 데이터 모델링 및 분석 (Modeling and Analysis of Accelerated Degradation Testing Data for a Solid State Drive (SSD))

  • 문병민;최영진;지유민;이용중;이근우;나한주;양중섭;배석주
    • 한국신뢰성학회지:신뢰성응용연구
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    • 제18권1호
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    • pp.33-39
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    • 2018
  • Purpose: Accelerated degradation tests can be effective in assessing product reliability when degradation leading to failure can be observed. This article proposes an accelerated degradation test model for highly reliable solid state drives (SSDs). Methods: We suggest a nonlinear mixed-effects (NLME) model to degradation data for SSDs. A Monte Carlo simulation is used to estimate lifetime distribution in accelerated degradation testing data. This simulation is performed by generating random samples from the assumed NLME model. Conclusion: We apply the proposed method to degradation data collected from SSDs. The derived power model is shown to be much better at fitting the degradation data than other existing models. Finally, the Monte Carlo simulation based on the NLME model provides reasonable results in lifetime estimation.

Packet Core Network NMS 구축 및 관리 방안 연구 (The study on NMS implementation and management of Packet Core Network)

  • 박종훈;김지선;강찬구;유재황
    • 한국정보통신설비학회:학술대회논문집
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    • 한국정보통신설비학회 2004년도 하계학술대회
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    • pp.328-333
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    • 2004
  • SK Telecom은 2000년 10월 세계 최초로 기존 IS-95A/B망에서 지원하였던 속도인 14.4Kbps나 56Kbps 보다 훨씬 빠른 최고 144Kbps로 무선인터넷이 가능한 CDMA2000 IX를 상용화 하였다. 또한, 2002년 1월에는 CDMA2000 IX보다 15배 이상 빠른 최대 2.4Mbps가 가능한 동기식 3세대 망인 CDMA2000 IxEV-DO를 세계 최초로 상용화 하였다. 이러한 초고속 무선 인터넷 서비스를 위해서 패킷 데이터 처리에 필수적인 PDSN(Packet Data Serving Node), HA(Home Agent), AAA(Authentication, Authorization and Accounting) 등의 노드들로 구성된 Packet Core Network(이하 PCN)이 도입되었으며, 이에 대한 운용 및 관리 방안이 중요한 issue로 등장하였다. 본 논문에서는 기존의 음성 서비스 관리를 위한 망관리 시스템(Network Management System)과는 다른 개념으로 관리되어야 할 패킷 서비스를 위한 NMS 구축 방안을 제시하고, 필수적인 관리 정보 및 서비스 관리를 위한 방향을 제시한다.

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Electrochemical Control of Metabolic Flux of Weissella kimchii sk10: Neutral Red Immobilized in Cytoplasmic Membrane as Electron Channel

  • PARK, SUN-MI;KANG, HYE-SUN;PARK, DAE-WON;PARK, DOO-HYUN
    • Journal of Microbiology and Biotechnology
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    • 제15권1호
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    • pp.80-85
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    • 2005
  • Electrochemical control of the metabolic flux of W. kimchii sk10 on glucose and pyruvate was studied. The growing cell of W. kimchii sk10 produced 87.4 mM lactate, 69.3 mM ethanol, and 4.9mM lactate from 83.1mM glucose under oxidation condition of the anode compartment, but 98.9 mM lactate, 84.3mM ethanol, and 0.2 mM acetate were produced from 90.8 mM glucose under reduction condition of the cathode compartment for 24 h, respectively. The resting cell of W. kimchii sk10 produced 15.9 mM lactate and 15.2 mM acetate from 32.1 mM pyruvate under oxidation condition of the anode compartment, and 71.3 mM lactate and 3.8 mM acetate from 79.8mM pyruvate under reduction condition of the cathode compartment. The redox balance (NADH/$NAD^+$) of metabolites electrochemically produced from pyruvate was 1.05 and 18.76 under oxidation and reduction conditions, respectively. On the basis of these results, we suggest that the neutral red (NR) immobilized in bacterial membrane can function as an electron channel for the electron transfer between electrode and cytoplasm without dissipation of membrane potential, and that the bacterial fermentation of W. kimchii sk10 can be shifted to oxidized or reduced pathways by the electrochemical oxidation or reduction, respectively.