비모수 분석모형을 활용한 인터넷비즈니스의 수확체증법칙에 관한 실증연구

박명섭,서상범,Park, Myung-Sub,Seo, Sang-Beom 한국경영정보학회 2003 Asia Pacific Journal of Information Systems Vol.13 No.4

This article attempts to examine the well-known law that the increasing returns to scale(IRS) is effective in the Internet business. The effect of IRS is one of the hottest issues in the Internet business sector. Many cases and survey studies support the fact that the IRS phenomenon exists in the Internet business. Executives in Internet business generally give a deep trust on this theory. As the Internet business grows, however, the boundary of the business becomes widened and complicated. And each category of Internet business is characterized with a different business style and economic behavior. It may, therefore, be dangerous to accept that the phenomenon of IRS is applied to all areas of Internet business. For this reason, the research for the close look into the IRS phenomenon should provide significant implications for the managers in the Internet business industry. This article divides the internet business into four sub-areas, and analyzes the IRS phenomenon using AHP/DEA-based full ordering technique. Interpretations are given, based upon the research results, for each sub-area of Internet business, as a guideline of setting business strategies for practical managers.

가변 비트율을 통한 적응형 스트리밍 서비스 시스템의 설계

양명섭, 김기원, 박승배 초당대학교 초고속정보화센터 2001 초고속정보화센터논문집 Vol.2 No.-

최근 VOD(Video On Demand)나 AOD(Audio On Demand) 서비스가 급증하면서 멀티미디어 스트리밍 기술에 대한 관심이 커지고 있다. 기존의 스트리밍 서비스는 정적으로 멀티미디어를 전송하므로 네트워크 환경의 대역폭(bandwidth) 변화에 대처하는데 한계가 있다. 이러한 문제점을 해결하기 위하여 본 논문에서는 적응형 스트리밍 서비스(ASS; Adaptive Streaming Service) 시스템을 제안한다. ASS 시스템은 가변 비트율을 통한 미디어 스케일링방식을 이용하여 멀티미디어 데이터를 동적으로 전송한다. 기존의 스트리밍 서비스의 버퍼링 방식의 단점을 해결하기 위하여 본 논문에서는 프레임 조정방식과 화질 조정방식을 동시에 채택하여 적용함으로써 고화질이 보장되는 전송환경(비디오의 프레임 정보는 단위 시간당 프레임 수 3단계, 화질 5단계)과 느린 회선에서도 끊김없이 안정적인 스트리밍 서비스를 제공받을 수 있도록 한다. ASS시스템을 실제 네트워크 환경에서 사용하면 멀티미디어 전송시 대역폭 변화에 대처하는 한계를 극복할 수 있으며, 보다 안정된 스트리밍 서비스를 제공받을 수 있을 것이다. As the service of VOD(Video On Demand) and AOD(Audio On Demand) increases, the need for multimedia streaming technique is on the increase. Because of static transmission of existing multimedia streaming service, it is difficult to deal with variation of bandwidth. Thus we propose a ASS(Adaptive Streaming Service) system in order to provide more efficient multimedia streaming service. Because ASS system use the method of media streaming using variable bit rate, ASS system is possible to dynamic transmission. As the ASS system accept both control method of frame and control method of quality, ASS system is possible to provide stable streaming service without cutting at slow line and to provide high quality at transmission environment(video frame : step 3, quality : step 5 frame per hour). If we implement ASS system on network, then we'll solve the problems about variation of bandwidth and it'll be provide us stable streaming service.

하악구치부 보철공간을 위한 상악구치부의 분절골절단 및 상방 정위

김명래,김충,김형섭 대한악안면성형재건외과학회 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.4

Purpose : This is to review the cases of posterior maxillary segmental osteotomies to regain the interarch spaces for dental implants in the posterior mandible. Materials & Methods: Seven patients who presented with alveolar extrusion of upper posterior molars underwent segmental osteotomies by single-stage Kufner's buccal approach under the intravenous sedation and local anesthesia. The posterior maxillary cento-alveolar segments were repositioned upward using pre-fabricated palato-occlusal resin splints and immobilized with osteosynthesis microplates and screws Dental implants were installated simultaneously. The regained spaces, tooth vitality, periodontal healing, relapse, tenderness on function, and complications including maxillary sinus involvements were evaluated periodically for over one year after the surgeries. Results : The single-tage procedures were completed within 80 minutes without any surgical complications. The posterior maxillary segments were repositioned upward to regain the interarch spaces ranging from 2.5 to 5.5mm. All teeth involved in the procedures keep their vitalities. The repositioned segments were maintained showing neither evidence of periodontal break-down nor tenderness to function, One patient whose segments had not been immobilized by osteosynthesis plate resulted in 2mm down-ward relapse in post-operative 8 months. A case of postoperative nasal bleeding from the posterior-lateral wall resulted in oroantral fistula and chronic maxillary sinusitis later. Conclusion : The extruded dento-alveolar segments of the posterior maxilla were repositioned properly by Kufner's one-stage segmental osteotomies. One microplate can be of help to keep the position until the osseous healing enough to support the masticatory force.

光州 近郊産 淡水魚의 脂質成分의 分析 : 잉어 및 가물치를 중심으로 Cyprinus carpio and Channa argus

李炳燮,朴貞淑,李明烈 조선대학교 기초과학연구소 1992 自然科學硏究 Vol.15 No.1

淡水魚인 가물치 및 잉어를 試料로 一般成分 分析과 遊離脂質과 結合脂質을 抽出하고 이를 각각 column chromatography에 의하여 中性脂質, 糖脂質 및 燐脂質로 분획한 다음 이들 各 脂質의 構成脂質을 TLC scanner, GC 등으로 分離, 定量한 結果는 다음과 같다. 1. 總脂質은 가물치 2.9% 및 잉어 4.4% 이었으며 가물치에는 遂離脂質이 2.6%, 結合脂質이 0.3%, 잉어에는 遊離脂質이 4.3%, 結合脂質이 0.1%가 含有되었다. 2. 遊離脂質을 構成하는 脂質의 含量은 中性脂質의 경우 가물치 96.3%, 잉어 95.8% 이었으며 糖脂質은 가물치 2.8%, 잉어 1.7%이고 燐脂質은 가물치 0.9%, 잉어 35.7%가 含有되어 있으며 結合脂質에는 中性脂質이 가물치 24.2%, 잉어 35.7%이고 糖脂質은 가물치 2.2%, 잉어6.9% 燐脂質은 가물치 7.36%, 잉어 57.4%로 各 試料에서 遊離脂質 중에는 中性脂質의 含量이 높았고 結合脂質에는 燐脂質의 含量이 높았다. 3. 遊離 및 結合脂質 중의 中性脂質로는 monoglyceride, diglyceride free sterol, fattyacid, triglyceride, esterified sterol 등이 分離 同定되었으며 이 중 trig1yceride가 遊離脂質에82.8~95.3%, 結合脂質에 35.I~43.3%로 가장 많이 含有되었다. 4. 遊離脂質과 結合脂質을 構成하는 燐脂質로는 phosphatidyl choline, leacithin, phoshatidyl glycerol, phosphatidyl serine, steryl glycoside+phosphatidyl ethanolamine 등이 分離同定 되었으며 遊離脂質의 경우 各 試料에서 phosphatidyl choline이 30.8~42.6%, 結合脂質에는 leacithin이 31.8~32.0%가 含有되었다. 6. 總脂質을 構成하는 주된 脂肪酸은 各 群에서 C_16.0C_1^8_1의 含量이 가장 많았으며 中性脂質에는 各 群에서 C_l8 1, C_18 2, 糖脂質에는 遊離脂質이 가물치가 C_20 1, 잉어가 C_l8 1로 多量含有되어 있으며 結合脂質은 가물치가 C_18 1, 잉어 C_16 1이 含有되어 있다. 燐脂質의 脂肪酸조성은 遊離脂質은 各 群에서 C_18 o, 結合脂質은 料 群에서 C_18 0이 多量 含有되어 있었다. These systemic analyses were carried out to investigate approximate compositions, and the isolation and identification of fatty acid in fresh-water fishes(cyprinus carpio and Channa argus) by thin layer chromatography and gas chromatography. The results were follows ; Total lipids were contained 2.9% in Channa argus and 4.4% of Cyprinus carpio, and Channa argus had 2.6% free lipid and 0.3% bound lipid and 4.3% free lipid and 0.1% bound lipid in Cyprinus carpio, respectively. Free forms were mostly consisted of neutrall lipids(95.8∼96.3%) and in bound forms 57.4∼73.6% phospholipids in each sample. TG(Triglyceride) was the most abundant component, MG(Monoglyceride), DG(diglyceride), FS(free sterol), FFA(free fatty acid) and ES(Esterified sterol) were fractionated and identified in neutral lipids of the free and bound lipid in each sample. The glycolipids contained in free and bound lipids were identified as 7 components, of which MGDG(monogalactosyl diglyceride) was most abundant in free lipids and DGDG(digalactosyl diglyceride) in bound lipids in each sample. The phospholipids in free and bound lipids were identified as 5 components, of which the highest content was PC(phosphatidyl choline) in free lipid and LT(lecithin) in bound lipid.

개에서의 膀胱結石 手術3例

김명철,장석진,이교영,김남중,변홍섭,박명호 충남대학교 수의과대학 동물의과학연구소 1995 動物醫科學硏究誌 Vol.3 No.-

Three dogs which show clinical signs of cystic calculi with anorexia, hematuria, stranguria, dribbling of urine, and pain in posterior abdomen, were referred, and diagnosed as cystic calculi by radiography and ultrasonography. Removal of urinary cystic calculi was performed by urinary cystotomy. Calculi, removed surgically, were analyzed chemically and microscolically. Calculi from three patient dogs were calcium carbonate in all. After the removal of calculi recurrence of urolith were not observed up to nowadays for about 4-10 months.

다시마 액즙의 추출조건

김명희,이영재,강훈이,강동수,김해섭,배태진 여수대학교 1998 論文集 Vol.13 No.2

To improve the utilization of sea tangle, the processing conditions of extracts, such as kind of additives, particle size of a sample, sample to solvent ratio, extracting temperature and time were studied. Among five extracting methods used for sea tangle extraction, the optimal method was water extraction. The most appropriate particle size of sea tangle powder, extracting temperature and mixing ratio of sea tangle to water were 5 mesh, 60℃ and 1 to 13(w/v), respectively. The basis of solids yield in sea tangle extract, optimal extracting time was about 2 hours. The yield of soluble solids under above-mentioned conditions was 5.1%.

한국 전통민속놀이에서 북춤의 역할과 발달

채명순,오동섭 韓國舞踊敎育學會 1999 韓國舞踊敎育學會誌 Vol.10 No.1

Representative drum dances(bukchum) among Korean traditional drum dances are Milyang Obukckum, Nalmoe Bukchum and Jindo Bukchum, which are closely related with folk plays. The purpose of this paper is to study that how these Buckchums were connected with folk plays, what are roles of Bukchums in the folk plays and how those had been developed in the folk plays. An aim of Milyang baekjungnori was to console servants after weeding a rice field before harvest time, so Obukchum performance of baekjungnori made country people get a place of harmony where noblemen and servants solved troubles between them. Nalmoe Bukchum would be a branch of the Nongak(farmer's percussion and dance) performance and have been developed from a drum play on an individually playing stage in the Bisan Nongak derived from the Cheonwangmaegigut(a sort of exorcism) of Taegu province. Jindo Bukchum was originated from a drum play of the Jindo Dulnorea(farmer's song) and then was recreated by exorcists of the Jindo Island. That was developed as a solo drum dance, however, was frequently performed with other folk plays. It kept a role of raising amusements for all attendants including performers and audiences.

Linear Poly(ethyleneimine)을 포함하는 루테늄 착물의 합성과 성질

박명규,한정호,조태섭 嶺南大學校基礎科學硏究所 2001 基礎科學硏究 Vol.21 No.-

Many researchers have interested ruthenium complexes due to their similarity and difference in chemical properties. In this study, [Ru(phen)_2LPEI]^2+ complex was synthesized by the reaction of [Ru(phen)_2Cl_2] with polymeric amine ligands, namely, linear poly(ethyleneimine)(LPEI). [Ru(phen)_2LPEI]^2+ complexes were analyzed by NMR, UV/VIS, and MS spectrometry. as well as Elemental analysis. From NMR analysis, [Ru(phen)_2LPEI]^2+ complexes were confirmed by comparison of [Ru(phen)_2Cl_2] with LPEI complexes. Coordination of LPEI ligands to [Ru(phen)_2Cl_2] showed absorption at 480㎚, whereas [Ru(phen)_2Cl_2] complex alone has a peak at 370㎚. Mass of LPEI complexes was analyzed 1638 and 1898 dalton, [Ru(phen)_2LPEI]^2+ complex form MS spectrometry. The spectroscopic methods for the [Ru(phen)_2LPEI]^2+ complexes system revealed that two nitrogen donor atoms on the LPEI chain are coordinated to the [Ru(phen)_2Cl_2] complex.

메치실린 耐性菌에 대한 抗生物質 生産菌株의 分離에 관한 硏究

李明燮,李旻貞,金昌漢 건국대학교 생명과학연구원 1994 생명과학지 Vol.1 No.-

메치실린 내성 황색 포도상구균인 St. aureus TK 784에 대한 항균활성을 나타내는 항생물질을 생산하는 새로운 미생물을 분리하기 위하여 토양으로부터 방선균의 분리를 실시하였다. 총 261균주의 토양방선균을 분리하여 메치실린 내성균인 St. aureus TK 784에 대한 항균활성을 검정한 결과 32균주가 항균활성을 나타내었다. 이중 8균주는 메치실린 내성균에 대한 항균활성이 비교적 크게 나타났으며, 이 중 1∼2 균주를 선정하여 앞으로 계속 메치실린 내성균에 대한 항생제 개발을 위하여 연구하고자 한다. For screening of microorganisms with antimicrobial activity against methicillin-resistant staphlococci(MRS), we isolated 261 strains of actinomycetes from soil. Among the 261 isolates, 32 strains produced anti-MRS antibiotics. Among the anti-MRS antibiotics producing strains, eight strains showed remarkably antimicrobial activity against Staphylococcus aureus TK 784, a methicillin-resistant staphylococci.

생쥐의 骨髓細胞에 대한 Aminopterin 과 Amethopterin의 細胞遺傳學的 影響

양재섭,강봉석,최명철,김길웅 대구대학교 기초과학연구소 1987 基礎科學硏究 Vol.4 No.-

Aminopterin and amethopterin(Methotrexate; MTX) are antifolic drugs and anti-tumour agents, which inhibit DNA biosynthesis, were previously known to have mutagenic effects on various mammalian cells. Mutagenecity and toxicity of these agents have been determined by various methods. In the present study, effects of two anti-tumour agents on cultured mouse bone marrow cells were analyzed by observing chromosome aberrations and mitotic index. The results of the present investigation were as follows; 1. The chromosome aberrations analyzed were mainly chromosome gaps and breaks, chromatid gaps and breaks. In the Group-1 (treated for 8 hours), chromosome aberrations were not shown and it seems that mutagenic actions of anti-tumour agents were not aroused due to the short period of culture and the other culture conditions. However, in the Group-2 (treated for 24 hours), as the concentrations of antifolic compounds were increased, chromosome aberrations were increased. 2. In mitotic index, the Group-I treated with aminopterin and amethopterin showed marked inhibition in the mitotic index(O. 6% in aminopterin, 0.9% in amethopterin) at the high concentrations, compared with that of control (5. 2%). Both aminopterin and amethopterin showed a dose-dependent reduction of mitotic index. In the Group-2, each group treated with two antifolic compounds showed no marked differences in the mitotic index. compared with that of control. 3. Aminopterin was a more potent agent for induction of chromosome aberration than amethopterin.