벤처기업의 고객관계관리를 위한 개인화 추천 시스템 성과 분석

노희선,김광용,한경석 한국인터넷비즈니스학회 2001 인터넷비지니스연구 Vol.2 No.2

본 연구에서는 현재 벤처기업의 고객 중심의 전략을 수립하고 벤처기업의 장기성과로 연결시킬 수 있는 개인화 추천 시스템(Personalization Recommendation System)의 성과를 가시적으로 제시하는 것이 연구목적이다. 그 성과를 측정하기 위해 고객의 충성도를 인식 충성도(Perceptional Loyalty), 거래 충성도(Transactional Loyalty), 잠재적 충성도(Complex Loyalty)로 나누어 충성도 성과를 측정하었다. 위의 연구목적을 달성하기 위해 본 연구에서는 설문 데이터뿐만 아니라 웹 상의 거래데이터를 이용하였다. 또한 솔로몬 4 집단 실험설계를 통해 개인화 추천 시스템 도입과 사용여부의 요인을 모두 고려하고 가능한 모든 외생변수를 룹제하여 보다 정확한 개인화 추천 시스템의 성과를 측정하고자 하였다. 그 결과, 개인화 추천 시스템으로 인해 인식 충성도인 만족도, 거래충성도인 교차판매, 잠재적 충성도인 LTV 성과가 증가함을 보여주었고 고객의 구매패턴이 빨라지는 것을 알 수 있었다. 이로써 개인화 추천 시스템의 정성적 성과와 정량적 성과를 제시할 수 있었고, 개인화 추천 시스템이 벤처기업의 매출 향상과 고객이 한번에 많은 량을 구매함으로써 그 배송비용을 절감시켜줌으로써 벤처기업의 수익구조의 기반이 될 수 있음을 보여주었다. This research is to study the performance of the personalized recommendation system for building the customer oriented strategy and connecting into the long-term profit of the company. For measuring the performance, customer loyalty of personalized recommendation system is divide into Perceptional Loyalty, Transactional Loyalty and Complex Loyalty. For achieving the research objectives, two different kinds of data were used, One is the perception data through the web survey and the other is the transaction data in the electronic commerce cyber book store. The methodology used is not only independent sampling T-test but also Solomon four-group experimental design, for getting more accurate result. In addition, the analysis of Return of Investment(ROI) through the Life time Value(LTV) were tried. The result shows that all of the loyalty is increased by the personalized recommendation system ; the increase of customer satisfaction in the perceptional loyalty, the increase of Cress selling in transactional loyalty and the increase of LTV in the complex loyalty. The analysis of Solomen 4 group experimental design, it also shows that the sales are per each customer increased by amount 250,000 per year. The Further research, like customer pattern analysis using the log data, should be done for the more complex and varied measure of ROI in electronic commerce.

강진만 갯벌의 자정능력 평가

김도희,김광수,조현서 木浦海洋大學校 2001 論文集 Vol.9 No.2

We estimated the self purification capacity of tidal flats in KanJin Bay, southwestern coast of Korea during flood tide and ebb tide in September, December, 1997 and March, 1998. The net flux of 17.8 gDIN/m²/yr with tidal current outflow to sea was estimated in September and 16.0 gDIN/m2/yr outflow to sea in December, while 0.57 gDIN/m²/yr influx into the tidal flat in March. The flux of 1.29 gDIP/m²/yr outflow to sea was estimated in September, while 2.64 gDIP/m2/yr and 5.90 gDIP/m²/yr influx into the tidal flat in December and in March, respectively. The SS flux of 0.849 kgSS/m²/yr and 5.28 kgSS/m²/yr outflow to sea were estimated in September and in March, while 12.0 kgSS/m²/yr inflow into the tidal flat in December. The net flux of 339 gCOD/m²/yr was inflow into the tidal flat was estimated in September, 254 gCOD/m²/yr in December and 63.7 gCOD/m²/yr in March, respectively. The capacity of COD purification of the tidal flats was 219 gCOD/m²/yr for a period of the diurnal tide.

Azathioprine에 반응을 보인 류마티양 관절염에 의한 경막염(Pachymeningitis)1예

배광봉,이정호,이정찬,곽상혁,강정현,김철희,김현수,김종숙,조덕연,김삼용 충남대학교 의과대학 지역사회의학연구소 1999 충남의대잡지 Vol.26 No.1

Rheumatoid arthritis frequently involves the cervical spine and may lead to neurologic impairement. However, direct involvement of CNS structures by inflammatory cells has been reported infrequently. The prevalence of this complication of rheumatoid arthritis is unknown. Inflammatory CNS involvement in rheumatoid arthritis reportedly occurs in the setting of longstanding, active, erosive articular disease and is accompanied by extracranial and extraspinal nodules and vasculitis. This is diagnosed by radiologic finding of CNS nodules or meningeal thickening and by biopsy or autopsy. Treatment with corticosteroid, cytotoxic agent or surgical decompression is helpful. But the majority of patients die within several months of onset of neurologic symptom. Recently, we experienced a case of pachymeningitis caused by rheumatoid arthritis, which resolved repeatedly with azathioprine treatment.

노인환자에서 전신마취 후 발견된 뇌경색

이광범,김정률,안용미,최준석,박천희 朝鮮大學校 附設 醫學硏究所 2008 The Medical Journal of Chosun University Vol.33 No.3

Perioperative cerebral infarction is rare but may be fatal. This is a case report of acute cerebral infarction following general anesthesia in geriatric patient. A 72 year old female patient was admitted for transabdominal hysterectomy and bilateral saipingooophorectomy and pelvic lymphnode dissection. Preanesthetic assessment revealed a history of hypertension and diabetes mellitus. After surgery, she was alert but she gradually appeared to have right hemiparesis and confusion. Emergency CT brain scan showed early cerebral infarction in the middle cerebral artery territory. She was transferred to the depart ment of neurology and received treatment. She was discharged at 19 days after surgery with improved symptoms.

빈랑의 Streptococcus mutans JC-2의 산생성 억제효과와 세포독성에 대한 연구

이광희,남용옥 大韓齒科保存學會 1997 Restorative Dentistry & Endodontics Vol.22 No.2

In order to develop natural anticariogenic agents, we investigated inhibitory effects of Areca catechu L. extracts on the acid production of Streptococcus mutans JC-2 and its cytotoxicity on NIH 3T3 fibroblasts were also examined. The results are as follows: 1. Major organic acid produced by Streptococcus mutans JC-2 were lactic acid and acetic acid, and their productions were decreased by additions of Areca catechu L. extracts. 2. Areca catechu L. extracts were showed moncytotoxicity on NIII 3T3 fibroblasts.

구조물의 진동 완화를 위한 스마트 감쇠 시스템의 설계 : Part 1. 단일 리야프노프 제어 알고리즘의 전개와 수치적 검증 Part 1. Application of Unified Lyapunov Algorithm and its Numerical Verification

허광희,이규,윤현도 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.2

This paper presents a new algorithm which is applicable in designing a smart damping system for vibration mitigation. The algorithm, which is extended into a unified system from Lyapunov stability theory, enables us to decrease the Quantization errors by its increased stability. The validity of this design method was proved in the numerical simulation on a control model of three-storied building structure. Smart damper was used for MR(magnetorheological fluid) damper in the numerical model, and its control effectiveness was evaluated. In order to make a more accurate control model numerical1y, we updated the model on the basis of the analysis of dynamic characteristics of structure and of the numerical analysis of a lumped mass model, and then adopted a state space model redefined by structural property matrix. Using this improved control model, control effect on structures which were under the influence of each different earthquake magnitude was analyzed with various performance index, and thus the algorithm presented here is proved to be valid.

이온주입된 Si에서 급속 열처리에 따른 결정성 거동에 관한 연구

문영희,배인호,이정열,장광수 嶺南大學校 基礎科學硏究所 1998 基礎科學硏究 Vol.18 No.-

We investigated the crystalline behaviour in active ion implanted by Secondary ion mass spectroscopy (SIMS) and Raman spectroscopy. The implantation-induced amorphization of damaged layer was clearly observed via the evolution,with increasing fluence of the broad four-band continuum of amorphous Si which extends from zero up to ??. For the samples annealed wsing rapid thermal annealing(RTA) after an isochronical anneal(30 min.) and isothermal anneal(450 ℃) of samples implanted with As to a dose of ??, the simple line spectrum of cystalline Si was recoved. The sharp c-Si Raman peak at ?? decreased and broad a-Si to peak centered ?? predominated as the implantaton does was increased. To describe the amorphous-crystalline transition stucture was used RNM and SCM models. We found that peak center and width dramatically change between ?? and 300℃ suggesting their is a large stuctural change in this temperature range.

중증 재생불량성 빈혈 환자에서 신우신염에 대한 광범위항생제치료 중에 속발한 Saccharomyces cerevisiae 진균감염 1예

김철희,이정호,이정찬,강정현,곽상혁,배광봉,김현수,김종숙,조덕연,김삼용 충남대학교 의과대학 지역사회의학연구소 1999 충남의대잡지 Vol.26 No.1

Most patients with aplastic anemia who do not respond to immunosuppressive treatment or are not candidates for bone marrow transplantation die of infection or bleeding. The neutropenia in acute leukemia, aplastic anemia, or occurring subsequently to chemotherapy and bone marrow transplantation increases susceptibility to infection. In general, the number of infectious episodes correlate with the degree and duration of neutropenia. Global immunosuppression produced by conditioning for bone marrow transplantation or graft-versus-host disease, is associated with unusual bacterial and fungal pathogens, or serious viral and protozoan infections. In addition, repeated treatment with broad-spectrum antibiotics is associated with the emergence of resistant organisms and fungal diseases because of the altered microbial microenvironment of the host. The incidence of invasive fungal infection caused by Saccharomycetes eerevisiae in immunosuppressed patients is very rare, compared with that of infection by candida or aspcrgillus species. Cases of Saccharomycetes cerevisiae fungemia occurring in the course of treatment with broad-spectrum antibiotics are reported in patients with extensive burn or with prosthetic valve endocarditis. We experienced a case of urinary tract infection by Saccharomycetes cerevisiae in a 27-year old female patient with severe aplastic anemia. We report the case with a review of relevant literatures.

모바일 비즈니스 수익 모델 분류에 관한 탐색적 연구

이대용,정광진,김희철 조선대학교 경영경제연구소 2002 經營經濟硏究 = Management and economics research Vol.25 No.2

냉동 제대혈 세포의 체외 증폭

김삼용,김철희,배광봉,김현수,박상준,김종숙,윤환중,조덕연 충남대학교 암연구소 1998 癌共同硏究所 硏究誌 Vol.2 No.1

Background : Cord blood(CB), which has no HLA restriction, is an alternative to bone marrow for hematopoietic stem cell transplantation. The use of cord blood, however, is limited by the number of progenitor/stem cells necessary to reconstitute the older child or adult. Therefore, ex vivo expansion of CB could have tremendous impact on diverse clinical settings. We studied the ex vivo expansion of isolated population of CD34_(+) cells from cryopreserved CB cells. Methods : CD34 cells were isolated from cryopreserved CB mononuclear cells. Purified cells were cultured with various combinations of hematopoietic growth factors including erythropoietin(EPO), stem cell factor(SCF), granulocyte-colony-stimulating factor(G-CSF), gra-nulocyte, macrophage-colony-stimulating factor(GM-CSF), interleukin-1β(IL-1β), 1L-3, and IL-6. After 7, 10 or 14 days of culture, the fold increases of colony-forming unit- granu-locyte, macrophage(CFU-GM), burst-forming unit-erythroid(BFU-E), colony-forming unit-mix (CFU-Mix), and high proliferative potential colony-forming cell(HPP-CFC) were evaluated. Results : Ten-day culture with the combination of EPO, SCF, G-CSF, IL-1β, and IL-3 resulted in a median of 60-fold increase of CFU-GM, which was greater than those with the combinations of less than 5 growth factors. The addition of IL-6 or GM-CSF to this combination did not enhance CFU-GM expansion. Ten-day culture was significantly superior to 7-day culture for CFU-GM expansion. Prolongation of culture to 14 days, however, revealed decreased expansion of CFU-GM compared to 10 days. BFU-E and CFU-Mix were expanded to 2~5 folds in 7-day culture with the combination of EPO, SCF, and G-CSF. Further expansion was not achieved in 10-day culture and colonies disappeared in 14-day culture. HPP-CFC was expanded to a median of 7.5 folds in 7-day culture with the combination of EPO, SCF, G-CSF, IL-1β, IL-3, and IL-6. Neither 10-day or 14 day-culture enhanced expansion of HPP-CFU. Conclusion : Cryopreserved cord blood cells maintain ex vivo expansion potential. In our system, 10-day culture with the combination consisting of EPO, SCF, G-CSF, IL-1β, and IL-3 seems to be adequate for hematopoietic progenitor/stem cell expansion from cryopreserved cord blood cells.