광고 대행사와 제작사의 사회연결망 분석 : 광고 대행사의 소유형태와 규모가 거래관계에 미친 영향

홍석민,윤태일,이기홍 한국방송광고공사 2005 광고연구 Vol.0 No.66

이 연구는 광고시장개방이 한국 광고산업에 실질적으로 미치는 영향을 규명하기 위해서, 2002년 산업자료를 바탕으로 대행사와 방송광고 제작사 사이의 거래연결망을 분석해보았다. 특히 사회연결망 분석(Social Network Analysis; SNA)의 틀을 원용하여, 광고 대행사의 소유형태(다국적 대행사 대 국내 대행사) 및 규모(상위권 대행사 대 중위권 대행사)에 따라 연결망에 차이가 있는가를 통계적으로 검증해 보았다. 분석결과 다국적 대행사가 국내 대행사보다, 그리고 상위권 대행사가 중위권 대행사보다 거래연결망의 구조 자체가 더 밀도가 높고 다양하여 효율적인 것으로 나타났다. 또, 이들 대행사의 중앙성(centrality) 지표가 높아 제작사와의 거래연결망에서 더 중심적인 위치를 차지하는 것으로 밝혀졌다. 특히 중앙성 지표에 대한 대행사의 소유형태와 규모 사이의 상호작용 효과는 연결정도 중앙성, 사이 중앙성, 위세 중앙성 3가지 지표 모두에서 나타났다. 또 중앙성 지표가 높은 대행사일수록 방송매출액, 순위, 종업원 수, 1인당 취급액 등의 기업성과 관련 지표에서도 우수성을 나타냈다. 이러한 분석결과에 대한 이론적 실무적 함의와 국내 광고산업의 경쟁력 제고를 위한 제언사항을 논의했다. Prior studies regarding Korea’s advertising industry have almost exclusively examined practitioners’ perceptions of changes in the advertising industry as global advertising agencies launched business in Korea. This study on Korea’s advertising market, however, used a unprecedented approach by looking into the relationship between advertising agencies and advertising production companies through the framework of social network analysis. It tested if there existed significant difference by ownership(global vs. local) and size(the largest 10 agencies vs. the rest) in maintaining business networks. Results from this study indicate that the global advertising agencies show stronger network density and centrality, more diversification, and more efficiency than the local advertising agencies in terms of inter-organizational relationship. Additionally, the interaction effect existed between the ownership and the size of advertising agencies by centrality index. Finally, the higher centrality index among agencies is, the higher billing and ranking are. The end of the paper offers further theoretical and practical implications of the analyses and suggestions to improve Korean advertising agencies’ business performance.

대두 및 대두발효식품의 항돌연변이성

윤기도,권동진,홍석산,김수일,정건섭 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.4

To investigate the inhibitory effect of soybean and Korean traditional fermented soybean products on the chemically induced mutagenesis, we extracted soybean, Kanjang, Doenjang, Kochujang, and Chonkukjang with water, methanol and hexane. Inhibitory effect of extracts was assayed by the SOS chromotest using Escherichia coli PQ37 as a test strain. 4-nitroquinoline-1-oxide(4NQO), N-methyl-N'-nitro-N-nitrosoguanidine(MNNG), and aflatoxin B_1(AFB_1) were used as mutagens. Methanol extracts showed relatively higher inhibitory effect than water and hexane extracts. Methanol extracts of soybea, Doenjang, Kochujang, and Chongkukjang showed inhibitory effect of 68.4, 96.3, 17.5, and 100.9%, against MNNG, and 28.6, 109.1, 41.3, and 101.8% against AFB_1., respectively. Doenjang methanol extract showed inhibitory effect of 51.0, 96.3, and 109.1% against 4NQO, MNNG, and AFB_1. Inhibitory effect of heat-treated Doenjang and Chongkukjang methanol extracts on the mutagenicity of MNNG and AFB_1 was remained over 95% of the inhibitory effect of heat-untreated extracts, demonstrating the heat stability of the potent antimutagenic activity.

ANALYSIS OF FIRE CHARACTERISTICS IN APARTMENT BUILDING THROUGH FULL SCALE EXPERIMENT AND ZONE MODEL SIMULATION

Yoon,Myong-O,Park,Jin-Kook,Kim,Choong-Ik,Ryou,Hong-Sun,Kim,Jin-Gon,Kim,Myung-Bae,Choi,Jun-Seok,Kim,Kwang-Il 한국화재소방학회 1997 한국화재소방학회 학술대회 논문집 Vol.1997 No.-

Fire characteristics of a typical apartment building in Korea was studied through full scale experiment and zone model simulation. The fire was ignited at the living room and allowed to spread to other parts of a single unit in a five storied apartment building. Various data including temperatures, species concentrations, and images were collected in the experiment. A zone model(CFAST) was used to analyze the same apartment building that represents the average households in Korea. The results were compared with a full scale experiments. While CFAST allows one compartment involved with fire, the experiment allowed the fire to spread to other compartments. Therefore, the comparison between experimental data and Zone-Model data is valid until the living-room fire spread to other parts of the apartment. Flashover occurred at approximately 380 seconds in a fire experiment, and at approximately 420 seconds in Zone-Model. Based on all of data between experimental data and Zone-Model data, it is concluded that the safe escape time is about 250 seconds.

타이어 설계인자를 고려한 자동차의 조종 및 안정 특성에 관한 연구

윤성운,홍석주,최규남 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.2

As the technique of automobile industry is being advanced, the advancement of performance for vehicle is being required. In order to achieve this purpose, the study on the handling and stability which are produced by moving vehicle is carried out actively. Ability to predict vehicle performance using computer simulation is essential to reducing the development time for tire companies as well as car makers. From the previous research. we showed that handling simulation tool developed for J-turn and lane change maneuvers on ADAMS could be used in predicting the performance difference among tires with different specifications in vehicle mild handling behaviors. Through this study, some meaningful correlations were achieved. Also barriers to direct application of the simulation technique to tire development process and several technical problems that should be resolved were iden tified. In this results, ability to predict vehicle performance using computer simulation is essential to reducing the development time for tire companies as well as car makers.

위암세포주에서 Recombinant Human Interferon-r와 Adriamycin의 투여순서가 항암효과에 미치는 영향

홍원선,손영숙,김창민,강윤구,이춘택,김유철,임영혁,남현석,이진오,강태웅 大韓免疫學會 1993 大韓免疫學會誌 Vol.15 No.-

Numerous previous studies, both in vitro and in vivo, have demonstrated that the cytotoxicity can be enhanced by the combination of chemotherapeutic agent and interferons(IFNs) in various types of cancer cells. We have previously reported that combined treatment of MKN-45, human gastric adenocarcinoma cells, with adriamycin(ADM) and recombinant human interferon-r(rh-IFN-r) increased in the cytotoxicity. In this study, the effects of combination timing of rh-IFN-r and ADM on the cytotoxicity against MKN-45 were investigated using MTT assay. MKN-45 was treated with rh-IFN-r and ADM in vitro on three schedules : Treat A ; rh-IFN-r and ADM were treated simultaneously, Treat B ; rh-IFN-r was treated 24 hours after the treatment with ADM, Treat C ; rh-IFN-r was treated for 72 hours and followed by the treatment with ADM. The survival of MKN -45 was inhibited by ADM dose-dependently. 102 and 103U/ml of rh-IFN-r significantly inhibited the survival of MKN-45(% survival : 35.1 ±-1.2% and 34.4 ±1.1% in Treat A and 42.5 ± 2.1% and 45.9-±2.5% in Treat C, respectively). However no difference in the survival was observed between 102 and 103U/ml of rh-IFN-r. Combined treatment with rh-IFN-r and ADM significantly augmented the cytotoxicity at low concentrations of ADM. Combined effects of rh-IFN-r and ADM were evaluated using IC30(,ag/ml) to ADM. IC30s of MKN-45 in Treat A, B and C at 102 U/ml of rh -IFN-r _ were 0.019 -?- 0.003, 0.045 :I:0.001 and 0.054 ± 0.012, respectively, while IC30 of MKN-45 treated with ADM alone was 0.052±0.004. IC30s of MKN-45 in ADM alone group, Treat A, Treat B and Treat C at 103U/ml of rh-IFN-r were 0.047 ±0.003, 0.004 -±0.001, 0.031 ±0.004 and 0.056 0.008, respectively. These results indicate IC30s of Treat A and B were significantly lower than those of ADM alone(p<0.05) and IC30s of Treat A was significantly lower than those of Treat B(p <0.01). IC30s of Treat C, however, were not different from those of ADM alone. From these results demonstrating that cytotoxic effects were increased by the combination of rh-IFN-r and ADM in the order, Treat A > Treat B> Treat C, it can be concluded that the simultaneous administration of rh-IFN-r and ADM may be the most effective method to combine these two therapeutic modalties.

성장과 운동수행능력 향상에 도움을 주는 식이조성물의 개발

윤승원,정은희,양동식,이홍석,윤유식 대한지역사회영양학회 2003 대한지역사회영양학회지 Vol.8 No.3

We developed a dietary supplement using natural herbs and nutrients for the growth and exercise performance improvement. It called JR-22 supplement containing distilled extracts of natural herbs to remove bitterness and the addition of Vitamin B1, B6, Ca and xylitol. We investigated on the effect of JR-22 supplementation on the maximal exercise performance, IGF-1 (insulin like growth factor-1) concentration and antioxidant activity in SD rat model. In result, JR-22 supplement group was better than control group about 10% in exercise performance test and increased about 63% of IGF-1 concentration in blood. In addition, the oxidative damage induced by exercise was reduced by JR- 22 supplementation. Therefore, we suggested that JR-22 supplementation enhanced effectively exercise performance and IGF-1 concentration and reduced to oxidative stress in muscles. Also, we analysed biochemical factors in blood for the safety of JR-22 supplement. We known that there is no change of blood lactic acid, ammonia, inorganic phosphorous ion and creatine kinase activity.

비만 개선 효과를 지닌 탄수화물 및 지방 흡수 억제 기능성 식이조성물 개발

윤유식,최선미,홍순복,홍정미,김정원,이홍석,홍성길 한국조리과학회 2002 한국식품조리과학회지 Vol.18 No.3

In a previous study, we developed a new food additive as an egg yolk antibody (IgY) against carbohydrate digestion enzymes for the regulation of blood glucose level and weight control. The IgY delayed and decreased the increment of blood glucose level after administration of sucrose in human being by 30% in 20∼30 min. We also developed a lipase inhibitor as a water extract of two kinds of herb, Platycodon grandiflorum and Solanum melongena. Twenty three volunteers were subjected to the intake of the egg yolk IgY plus the herbal extracts for 50 days. In average, the treated subjects appeared to lose 1.96 ㎏ of body weight and 3.4 ㎏ of body fat mass during the treated period. Furthermore, Panniculus adiposus and breech size were significantly decreased during the experimental period. Above results suggested that the administration of the dietary additives composed of egg yolk IgY and natural herbal extract improve the obesity by the decrement of body weight and body fat mass.

중이, 외이도 및 측두하와에 국한된 편평상피유두종 1예

윤병문,박성원,민경식,홍기수,조미연,양석우 대한이비인후과학회 1999 대한이비인후과학회지 두경부외과학 Vol.42 No.7

信號의 特性을 利用한 벡터 量子化에 關한 硏究

하석원,윤석현,홍광석 成均館大學校 科學技術硏究所 1996 論文集 Vol.47 No.2

In this paper, we have proposed a VQ algorithm which quantize feature vector of speech signal using a generating order. The proposed algorithm inspect which codeword follows present codeword and add new index to established codebook, when quantizer is mapping speech signal. We present a variable bit rate for new codebook, and propose efficient compression way of information. In this way , the number of computation and the number of codewords to be searched is reduced dramatically. The performance of the proposed VQ algorithm is evaluated by spectrum distortion measure and bit rate. The obtained spetrum distortion is reduced about 0.149[dB] and the bit rate is saved over 1 bit/ frame.

TiO₂-CaSO₄와 TiO₂-CaCO₃계의 고상반응기구 : TiO₂의 반응성 및 상형성 Reactivity of TiO₂and Phase Forming

김홍대,한인섭,유태석,정윤중 明知大學校 産業技術硏究所 1986 産業技術硏究所論文集 Vol.5 No.-

For to detect the mechanism of the product phase and the assignment of the two reactant on the solid state reaction of TiO₂ with the CaSO₄ and CaCO₃ respectively at the reaction temperature 900℃ - 1400℃, the refractive microscope, scanning electron microscope, and electron dispersive spectroscope analysis were examined. For the reaction of TiO₂ with CaSO₄ the product phase which earned is CaTiO₃perovskite and from the first, the intermediate product of TiO₂· CaO·SO₂ was formed. However, the main product phase is Ca₃Ti₂O7, which is coexisted in the product layer, at the reaction of TiO₂ with CaCO₃·TiO₂ was diffused into CaSO₄ and CaCO₃ reactant side is both two reaction. Specially, in the case of CaCO₃, the transfer of TiO₂ is rapid through the pore, which was formed with vaporization of CO₂ gas.