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리더의 빅 파이브(Big Five) 성격이 팀 애피커시에 미치는 영향
홍용기(Hong, Yong-Ki),박종혁(Park, Jong-Hyuk) 한국인적자원관리학회 2009 인적자원관리연구 Vol.16 No.S
본 연구에서는 리더의 성격 특성-리더십 스타일-팀 애피커시의 관계를 살펴보았다. 본 연구의 주요 내용은 리더의 빅 파이브 성격 특성이 변혁적 리더십에 영향을 미치는가, 변혁적 리더십이 팀 애피커시에 영향을 미치는가, 그리고 리더의 빅 파이브 성격 특성과 팀 애피커시 간의 관계에서 변혁적 리더십의 매개 효과가 존재하는 가이다. 가설 검증을 위해 14개 기업, 85개 팀을 대상으로 자료를 취합하였으며, 최소자승법(OLS: Ordinary Least Squares)에 의한 회귀분석을 실시하였다. 실증분석 결과 리더의 빅 파이브 성격 특성 중 신중성과 개방성은 변혁적 리더십에 유의한 영향을 미치며, 변혁적 리더십은 팀 애피커시에 정(+)의 영향을 미치는 것으로 밝혀졌다. 또한 변혁적 리더십은 리더의 신중성과 개방성이 팀 애피커시에 미치는 영향관계를 적어도 부분적으로 매개하는 것으로 규명되었다. 연구결과를 바탕으로 연구의의 및 향후 연구를 위한 제안을 제시하였다. This study examined the relationships among the Big-five model of the leader, transformational leadership, and team efficacy. We tested the mediating role of transformational leadership in the relationship between Big-five model of the leader and team efficacy. To test hypotheses, data were collected from 85 teams in 14 firms and analyzed using OLS(Ordinary Least Squares) regression technique. Results showed that conscientiousness and openness to experience among five personality had a significant impact on transformational leadership and team efficacy. We also found transformational leadership at least partially mediated the relationship between conscientiousness and openness to experience as a personality and team efficacy. Finally, Some implications, future research directions, and limitations were discussed.
발표논문 / 해양생물자원으로서 해조류 : 생물활성물질의 정제와 분자적 응용
홍용기(Yong Ki Hong) 한국조류학회 2000 국제심포지움 일정 및 발표논문집 - 21세기, 해양환경과 해양생물자원의 전망 Vol.- No.-
해조생물공학은 유용해조류 및 그들의 유용물질들을 경제적으로 생산할 수 있도록 개발하는 학문 분야이다. 본 논문에서는 이들 해조생물공학에 대한 실험방법적 접근을 강조하여 설명하고자 한다. 우선 해조류의 활력측정은 조직 자체의 효소활성 즉 무색의 2,3,5-triphenyltetrazolium chloride를 붉은색의 triphenylformazan으로 환원시키는 정도를 측정함으로서 정량적으로 간단하게 활력을 평가하는 방법을 확립하였다. 그리고 callus와 엽체 재생 등을 위한 무균 고체 조직배양에 가장 적합한 gelling agent들을 비교한바 high gel strength agar가 톳의 callus 형성 및 엽체 재생에 지지체로 가장 효율적이였다. 유용 생리활성물질의 탐색작업에서는 보라색우무 추출물에서 Taq DNA polymerase에 대한 저해작용을 보였으며, 청각, 구멍갈파래, 잎파래, 미역에는 Herpes simplex virus에 대한 항virus효과를 지녔다. 홑파래물추출물에서는 생먹이용 미세조류들의 성장에 촉진효과를 보였으며, 작은구슬산호말은 적조들의 성장을 억제시켰다. 넓패는 가시파래 및 담치에 대한 부착 억제작용을 보였다. 또한 김과 홑파래는 고cholesterol혈증에서 cholesterol수치를 강하시켰다. 그리고 해조류들의 유전분석을 위하여 DNA와 RNA 추출은 LiCl를 사용하여 간단하게 분리할수있다. 긴잎돌김, 여름김, 양식김 5종에 대한 18s rDNA 염기서열을 밝혔으며 RAPD 기법을 사용하여 지역간 톳 및 갈파래목의 유전적 다양성을 확인하였다. 김의 분화조직 들간 및 김의 산처리시 조직에서 반응을 나타내는 유전자들을 differential display 방법으로 분리하였다. 끝으로 김의 유전적 표식자를 gene gun을 사용하여 쉽게 김 엽체에 beta-glucuronidase gene을 도입할수 있었으며, 김의 품종 개량을 위하여 산 내성 및 필수 아미노산 고함유 품종을 선별중에 있다. Seaweed biotechnology is the field dealing with economical production of useful seaweeds and their chemicals. In this paper I will mainly discuss technical studies for the screening of biologically active substances and seaweed molecular characterization. At first, a seaweed viability assay was developed to evaluate tissue intactness using the enzymatic reduction of 2,3,5-triphenyltetrazolium chloride. Callus and blade formation, under axenic culture conditions of Hizikia fusiformis, depended on the selling agents used as a substrate. The most calli and blades were produced on solid media composed of 2% and 0.5% high gel strength agars, respectively. For biologically active substances from seaweed extracts, we have found a Taq DNA polymerase inhibitor, 2,3,6-tribromo-4,5-dihydroxyl benzyl methyl ether, from Symphyocladia latiuscula. Antiviral activity against Herpes simplex was detected from several seaweed extracts after light irradiation. Growth of feed phytoplanktons was enhanced by the addition of aqueous extract of the seaweed Monostroma nitidum. Algicidal activity of the seaweed Corallina pilulifera was detected against red tide microalgae. Antifouling activity of the Ishige folicea was detected against marine green algae and blue mussel. For the molecular characterization of seaweeds, DNA and RNA were extracted with the use of lithium chloride. The DNA was used as a template for PCR amplification to discriminate algae and for RAPD analysis. The RNA was of sufficient quality to be used as a cDNA template for differential display. We are now selecting acid-responding genes from the Porphyra yezoensis. Finally we have tried gene transfer into young P. yezoensis thalli by particle bombardment. Thalli, bombarded with tungsten particles coated with a beta-glucuronidase gene, showed a transient expression of the gene at 18.6 unit/mg/h. Selections of acid resistant stain and amino acid rich strain are going on for strain improvement of P. yezoensis. Key words: biologically active substance, differential display, genetic analysis, seaweed, seaweed biotechnology
홍용기(Hong Yong-Ki),정종덕(Chung Jong-Duk),편장식(Pyun Jang-Sik) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
When the electric motor car was first introduced, an engineer, responsible for the work related to operation and a conductor for the announcement and management of entrances and the other services like as monitoring the passengers in the platforms used to take together the train for passengers" safe. As new technologies developed and the urban transit system had the automatic driving facilities, automatic door switch and broadcasting systems, to solve the financial problems, most subway systems introduced the one-man operation system. To curtail the operating expense through automatic control and operation for the economical efficiency, the crewless driving system was introduced abroad around 1970 on the light weight train and Japan started the crewless driving system in 2005, Germany started it in June 2008. We examine system requirements of the system and methods to construct safe systems that would be introduced, suitable for one-man operation system or crewless driving system through the surveys and analysis of driving state and the systems.
홍용기(Hong Yong-Ki),정종덕(Chung Jong-Duk),편장식(Pyun Jang-Sik) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Several kinds of Electrical Wires have been used in Electric Multiple Units(EMU) for the supply of electric power, supervision, and the propagation of control signals. These Electrical Wires must be inspected for safe and stable operation of EMU. The degradation diagnosis and service lifetime to estimate the integrity of Electrical Wires has recently been requested according to the long use of EMU. This paper describes on application of diagnosis method and lifetime estimation EMU. This study is focused on development of diagnosis method and establishment of evaluation standard for urban railway vehicle.
해조류 김 추출물의 Triton WR-1339 유발 고콜레스테롤혈증 감소효과
홍용기(Yong Ki Hong),박인식(In Sick Park),정영하(Yeong Ha Jung),송상호(Sang Ho Song),홍성열(Sung Youl Hong) 한국수산과학회 1998 한국수산과학회지 Vol.31 No.4
An antihypercholesterolemic effect was observed by intraperitoneal injection of the seaweed Porphyra yezoensis extract. Hypercholesterolemia was induced by intraperitoneal injection of Triton WR-1339 (600 ㎍/g-body weight)into a morose. Maximum level of blood cholesterol was reached at 20 hours after Triton injection. By simultaneous injection of the P. yezoensis extract (30㎍/g-body weight) with the Triton into each fight and left sides of the peritoneal cavity, jewels of total cholesterol rind low density lipoprotein were decreased to 37% and 24% compared to Triton injection only. For histochemical changes, hepatic tissues obtained at 40 hours after injection of the Triton and the P. yezoensis extract were fixed in fromol-calcium solution. Numbers of lipid drops and cholesterol particles decreased in the portal space of the hepatic cytoplasm. This indicates that the accumulation of lipid, including cholesterol, caused by Triton was prevented by the antihypercholesterolemic effect of extract from the seaweed P. yezoensis.