온라인 여행상품 고객이탈 분석 연구: 데이터마이닝 로지스틱 회귀분석 활용

박상윤 한국해양관광학회 2023 해양관광학연구 Vol.16 No.4

Data mining has been steadily developed with the development of information technology, and in particular, the development of database technologies such as data storage technology, artificial intelligence, and deep learning and big data analysis technology has provided a major factor in the development of data mining. This spread of data mining is being used not only in database-based marketing such as target marketing, customer segmentation, related analysis, and shopping cart analysis, but also in various industries such as credit rating, quality control, and fraud detection. As the application of data mining expands, the use of data mining as a tool to analyze customer information in customer relationship management (CRM), which manages interactions between companies and customers, is becoming more common. In particular, in terms of customer relationship management, the interest of all companies is 'customer departure', which is important for corporate management because the cost of securing new customers is much higher than the cost of maintaining existing customers. Therefore, this paper attempted to implement online travel customer churn prediction/classification modeling with logistic regression analysis, a data mining technique mainly used for customer CRM, based on travel agency online reservation data, and to present an efficient online travel customer marketing strategy through the results.

계층형 관리 도메인을 위한 프록시 기반의 이동 에이전트 모델의 성능 평가

박상윤 한국컴퓨터산업학회 2002 컴퓨터産業敎育學會論文誌 Vol.3 No.8

As the distributed resources in the networks have become increasingly popular, the accesses to these resources having been activated. Especially, the accesses to the distributed resources using the mobile agent technologies provide the mechanisms supporting mobility with mobile users as well as the dynamic accesses to the resources in the fixed networks. Proxy-based mobile agent model is defined as mobile agent network model which allocates the hierarchical domains to the distributed resources changed dynamically, assigns one proxy server for each domain, and promotes the management and the cooperation of the mobile agents. In this paper, we introduce the architecture and the execution scenario for proxy-based mobile agent model which is suitable for the hierarchical management domains. In simulation, we evaluate the proxy server's route optimization functionality and the performance reducing execution time of the mobile agents.

OC 125 단세포군항체를 이용한 난소암의 면역신티그라피

박상윤,이제호,박기복,이경희,이의돈,임상무,홍성운 대한산부인과학회 1990 Obstetrics & Gynecology Science Vol.33 No.8

상피성난소암 환자 6명과 전이성난소암 환자 1명에서 8례의 131I OC 125 F(ab`)2면역신티그라피(ISG)를 시행하여 다음과 같은 결과를 얻었다. 1. 수술 및 경피적 조직천자생검으로 확인된 병소부위에 대한 ,ISG와 CT의 민감도는 각각 100%(14/14), 57.1%(8/14)이었으며, 특히 난소암에서 중요한 장간막 전이에 대한 민감도는 각각 100%(5/5), 20%(1/5)로 ISG가 우수하였다. 2. 혈청 CA 125 농도와 131I OC 125항체흡착의 종양 대 주변 방사능비는 상관관계가 없었다. 3. 131I OC 125 항체를 정맥주사한 후 3일, 5일, 7일째에 측정한 종양 대 주변 방사능비는 시간이 경과함에 따라 증가하는 경향이 있었다. 따라서 치료 전 혈청 CA 125농도가 높았던 난소암 환자에서 일차적인 진단시 보다는 난소암 치료 후 추적검사 중 다른 검사에 이상이 없는데도 불구하고 혈청 CA 125농도가 증가할 때, CT 등의 검사로 재발이 의심되면서 보조검사가 필요할 때, 혈청 CA 125농도에 관계없이 복부통증 등이 있어 재발이 의심될 때, 기왕에 사용되던 컴퓨터 단층촬영, 초음파검사, 진단적 복강경 등에 보완적으로 이용하거나, 또는 이상의 검사에서 찾아내지 못하는 작은 암종괴를 찾아내어 수술 및 약물치료에 활용할 수 있을 것으로 사료된다. Seven patients, suspected of having primary or recurrent ovarian carcinoma, were investigated by the method of immunoscintigraphy to diagnose primary and/or metastatic tumor sites. 131I labeled monoclonal antibody, OC 125 F(ab`)2 fragments (IMACIS-II , International CIS, Yvelines Cedex, France) were administered to all patients. Total body planar photoscans were recorded with a scintillation camera three to seven days after injection of radioantibody. The results were compared with operation and/or computed tomography(CT) findings. The tumor to background ratios were caculated in vivo. 1. The sensitivities of ISG and CT were 100% and 57.1% respectively in 14 hitopatologically proven tumor sites. 2. There were no correlations between the serum CA 125 levels and tumor to background antibody uptake ratios. 3. Tumor to background antibody uptake ratios were progressively increased from day 3 to day 7.

고농도 질산용액에서 Ag(I) 이온의 확산계수 측정

박상윤,최왕규,이근우,문제권,오원진,Park Sang Yoon,Choi Wang Kyu,Lee Kune Woo,Moon Jei Kwon,Oh Won Zin 한국전기화학회 1999 한국전기화학회지 Vol.2 No.2

From the anodic peak currents of cyclic voltammograms for Ag(I)/Ag(II) couple obtained with the variation of nitric acid concentration, Ag(I) concentration and solution temperature at a Pt electrode in concentrated nitric acid solutions, the diffusion coefficients of Ag(I) ion were evaluated to estimate the limiting current density of Ag(II)-mediated electrochemical oxidation (MEO) process, which has been effectively used for the complete destruction of hazardous organic materials. The results showed that, due to the water decomposition reaction which occurred simultaneously with the Ag(I) ion oxidation, background subtractions for the cyclic voltammograms were required to estimate the correct peak currents. The empirical relationship for the diffusion coefficient of Ag(I) was suggested as a function of solution viscosity and temperature.

Site-specific Anti-adsorptive Passivation in Microchannels

박상윤,김희찬,정택동 한국바이오칩학회 2007 BioChip Journal Vol.1 No.2

A novel methodology for generating site-specific anti-adsorptive coatings on microchannel walls was reported. The coating process consists of two steps. The first step is to coat the glass channel wall with linker molecules of TMSMA. And then the anti-adsorptive polymer, PEGMA, is photo-grafted onto the surface via a UV induced radical reaction using a patterned photo mask. We evaluated the proposed anti-adsorptive coating method by investigating the adsorption behavior of BSA-FITC and amine-modified polystyrene beads. This method offers valuable advantages because the coating process is carried out after the entire chip fabrication steps have been completed. The functional materials of interest could be grafted onto the microchannel wall which is difficult to access mechanically. Moreover, this method enables site-specific multiple materials coating preserving the organic layers undamaged during the chip fabrication processes.

B2B, B2G 환경에서 전자문서의 상호운용을 지원하는 DTD 상호운용 구조의 설계

박상윤 대한경영정보학회 2007 경영과 정보연구 Vol.21 No.-

According as Internet based EC(Electronic Commerce) has been activated, More requirements for exchanging digital documents are being proposed in B2B(Business to Business) and B2G(Business to Government) environments. However, the documents can not be processed automatically, because the structures of documents in each site(companies, central/local governments) do not match. Therefore, W3C(World Wide Web Consortium) has proposed XML(eXtensible Markup Language) DTD(Document Type Declaration) technology to support structuring documents. The XML DTD technology can support interoperability between EC sites. And, XML DTD based documents can be processed automatically in every sites. They will improve efficiency of services in B2B and B2G environments. In this paper, we propose interoperable DTD architecture and IDEP(Interoperable DTD Exchange Protocol) protocol which supports searching DTDs and exchanging DTDs. This technology can popularize DTDs and digital documents.

측두하악 장애환자의 하악 운동 Simulation에 관한 연구

박상윤,강동완,계기성,Park, Sang-Yoon,Kang, Dong-Wan,Kay, Kee-Sung 대한치과보철학회 1991 대한치과보철학회지 Vol.29 No.2

To understand the biomechanics of the mandibular movement of the patients with T.M.J. disorder, it is necessary to analyze the mandibular movement by the least moving points of instantaneous center of rotation on computer screen. In this study, two subjects without T.M.J. disorder and with normal occlusion and few patients with T.M.J. disorder were selected for obtaining the processing data. The habitual opening and dosing movements were recorded by image recognition system of video and computer and then the mandibular movement and the least moving point were analyzed using computer program for image anaysis of specialized points. The results obtained were as follows: 1. The least moving points of control group during opening and dosing were dose to the mandibular foramen, but in the test group there were differences between two positions of the least moving points during opening and closing. 2. The variations of the least moving point were in the range of $0.02\sim0.05cm$ of X-coordinate and $0.07\sim0.10cm$ of Y-coordinate for control group, whereas in the range of $0.05\sim0.30cm$ of X-coordinate and $0.08\sim1.65cm$ of Y-coordinate for test group. 3. The index of variation during opening and dosing movements was shown in $0.8\sim1.0$ for the control group and in $0.56\sim2.6$ for the test group. 4. After the treatment of the test group No. 4 by occlusal splint the least moving point was dose to the mandibular foramen and the index of variation was changed from 25 to 05. 5. The tracing shape of the least moving point in the test group represented the irregularities compared to the control group. 6. The mandibular opening and dosing movements were simulated on the computer screen following the movement of the least moving point of instantaneous center of rotation.

출산율 및 피임수용에 작용하는 가족계획외적 요인에 관한 분석연구

朴相潤,李明淑,廉容泰 고려대학교 의과대학 1991 고려대 의대 잡지 Vol.28 No.3

Most developing countries are attempting to control their rapid population growths by decreasing their fertility rates through family planning services. Many researchers have shown that fertility rates are affected mostly by economic level. social modernization. and family planning service. However, there has been little work to see which of these factors are actually influencing. This research attempted to find out how much of effect these influencing factors had by periodically analyzing acceptance of family planning in a rual area in Korea and the subsequent changes in the area's fertility rate. Afterwards, differentiating analyses were carried out to group these factors into direct and indirect effects. The subjects for this study came from a community health delvelopment project carried out by the Korea University in the Jeomdong Myon. Yeoju Kun. Kyonggi Province. The data for this research was obtained from village health workers'activity records, health service records of the health subcenter and various official government records of Myon. Unlisted data were obtained by an interview survey The data was sorted by a computer system using a Database package. and the statistical analyses were carried out by utilizing the SPSS program. The results of this study were summarized as follows: 1 Family planning acceptance rate was increased from 53.0% in 1983 to 79.9% in1989. Total fertility rate(TFR) was decreased from 3,515 in 1983 to 1.945 in 1989 The change of TFR in 1983 to in 1989 was attributed to the declining age speciflc fertility rate of high age. 2. Variables of beyond family planning influencing the contraceptive acceptance in orders of explaning capability were age of marriage, financial capability and children,telephone, possession of electric domestics television, husband's job, multiparity and maternal health, expense of medical insurance, fatalism, family type, birth-place, educational level of husband, job before marriage, newspaper, birth-place of husband, religion,desirable marriage of female, the eldest son and to live with parants, educational level. The total of those variables could explain 49.9% of contraceptive acceptance. 3. Variables of beyond family planning influencing number of children ever born in orders of explaning capability were age of marriage, husband job, reliance at siblings, religion, job educational level, the eldest son and to live with parants, family type,educational level of husband, expense of medical insurance, fatalism, financial capability and children, multiparity and maternal health, boy-preference, number of desirable children, newspaper, possession of electric domestics, birth place of husband, television, job before marriage. The total of those varlables could explain 51.0% of number of children ever born. 4. As the result of regression analysis with contraceptive acceptance it could explain 14.7% of number of children ever born. 5. As the result of stepwise multiple regression analysis with factors relating beyond family planning and contraceptive acceptance the total of those variables could explain 53.8% of number of children ever born

인발 성형 공정을 이용한 carbon-glass hybrid composite 제작

박상윤,최원종,강길호,문초록,김세영 한국항공대학교 항공우주산업기술연구소 2002 航空宇宙産業技術硏究所 硏究誌 Vol.12 No.-

단면이 일정한 구조용 복합재료 제조공정에 널리 사용되고 있는 pultrusion 공정을 이용하여 glass-carbon fiber hybrid composite을 제조하였다. 열분석을 통하여 모재의 경화온도와 경화시간을 분석한 후 금형의 온도와 pulling speed를 결정하였다. 다양한 섬유 비율의 hybrid composite를 제작하였으며 flexural modulus를 측정한 결과 rule of mixture를 이용한 예상치 보다 높은 값을 보였다. Glass-carbon hybrid composite was manufactured by pultrusion process. The major processing conditions such as temperature of heating die and pulling speed have been fixed from thermal analysis results. Hybrid composites with various carbon fiber content were manufactured and flexural modules of each hybrid composite as measured. Compare with rule of mixture, positive hybrid effect was observed.

여자축구 지도자의 감성리더십이 지도효율성과 선수생활만족도에 미치는 영향

박상윤,엄대영 한국체육학회 2015 전국체전기념 한국체육학회 학술발표회 Vol.2015 No.-