데이터 마이닝을 활용한 한국 프로야구 구단의 승패예측과 승률 향상을 위한 전략 도출 연구

김원종 ( Kim Won-jong ),최연식 ( Choi Yeon-sik ),유동희 ( Yoo Dong-hee ) 한국스포츠산업경영학회 2018 한국스포츠산업경영학회지 Vol.23 No.3

본 연구에서는 데이터 마이닝 기법을 활용하여 한국 프로야구의 승패예측모형을 구축하는 실험을 진행하였다. 이를 위해, 2017년에 실시된 한국 프로야구 10개 구단의 전체 경기 중 무승부 경기를 제외한 1,418경기에 대한 자료를 사용하였다. 승패예측모형에는 의사결정나무, 베이즈넷, 인공신경망 알고리즘과 앙상블 기법인 배깅과 부스팅이 사용되었으며, 그 결과 배깅 기법에 인공신경망을 적용한 예측모형에서 가장 높은 예측률인 85.18%를 기록하였다. 다음으로 의사결정나무 기반 예측모형을 활용하여 한국 프로야구 전체 구단에 관한 8개의 승패규칙을 도출하였다. 여기에서 승패규칙은 승패예측에 영향을 미치는 주요 요인들인 팀출루율, 팀타율, 피안타, 안타, 타석, 타수로 표현되며, 도출된 규칙을 바탕으로 구단의 승률 향상에 도움을 주는 전략을 제안하였다. 또한 플레이오프 진출 구단과 미진출 구단에 관한 승리규칙을 각각 4개씩 도출하였고 이를 바탕으로 두 집단에 맞춤화된 승률 향상 전략을 제시하였으며, 실제 구단에서 선수를 영입한 방향과의 비교를 통해 제시된 전략의 활용 가능성을 확인하였다. This study conducted an experiment to develop win-loss prediction models for the Korean professional baseball league using data mining techniques. To this end, we used data on 1,418 games from all games played by the ten Korean professional baseball teams in 2017, except draw games. We developed win-loss prediction models using not only a decision tree, Bayse net, and artificial neural network algorithms, but also ensemble methods, such as bagging and boosting. As a result, first, we found that the artificial neural network-based prediction model using the bagging method reported the best accuracy (85.18%). Second, we derived eight win-loss rules for entire teams from the decision tree-based prediction model. These rules consist of six influential factors: team on base average, team batting average, hit by opponent, hit, plate appearances, and at bat. Using the derived rules, we proposed helpful strategies for improving the winning rate. Third, we derived four winning rules for both playoff teams and non-playoff teams; using the rules we proposed customized strategies for improving the winning rate of the two different groups. Finally, we confirmed the feasibility of the proposed strategies by comparing non-playoff teams’ actual player recruitment strategies.

야뇨증 환아들의 심리사회적 특성에 대한 다기관 연구 : 행동 및 정서 문제를 중심으로

조수철,김재원,신민섭,황준원,한상원,박관현,이상돈,김경도,김건석,서홍진,이유식,정재용,김영균,문두건,남궁미경,한창희,조원열,김영식,배기수,이종국,정우영,신의진 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.6

Objectives : The aim of this study was to examine the behavioral and emotional problems associated with nocturnal enuresis in Korean children. Methods : Three hundred eighteen children with nocturnal enuresis, together with their parents, completed the Child Behavior Checklist (CBCL), Disruptive Behavior Disorder Scale according to DSM-IV (DBDS), Children's Depression Inventory (CDI), State-Trait Anxiety Inventory for Children (STAIC), and Piers-Harris Children's Self-Concept Scale (PHCSC). Ninety-three normal students were selected as the control group. Results : Compared to the normal control group, the mean scores with regard to the withdrawn, social problems, attention problems, delinquent behavior, aggressive behavior, externalizing problems and total problems profiles were significantly higher in the nocturnal enuresis group according to the CBCL results. The nocturnal enuresis group also scored significantly higher in the ADHD and ODD profiles of the DBDS. The nocturnal enuresis group was more depressed and anxious than the control group according to the results of the CDI and STAI. The mean score of the PHCSC was significantly lower in the nocturnal enuresis group when compared to the normal control group. Conclusion : The results of this study suggest that children with nocturnal enuresis in Korea have clinically relevant behavioral and emotional problems. The findings support the link between nocturnal enuresis and psychopathology in Korean children.

내시경적 절제로 진단된 폴립 형태의 심재성 낭종성 위염 2예

허종현,조영화,성용완,유재훈,구동영,김갑식,노지훈,문원 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.2

Gastritis cystica profunda (GCP) is a disease characterized by hyperplastic and significant extension of cystic dilatation of the gastric mucous glands, which results in a cystic lesion in gastric submucosa. It often occurs on the part of gastroenterostomy, but can be found in the stomach without any previous surgery. GCP has variable gross finding including solitary polyps, diffuse ones, submucosal tumors, and rare giant gastric mucosal fold. It is difficult to tell GCP from a cancerous lesion by gross finding that the disease demands a necessary tissue biopsy, though GCP is commonly showed as a benign in the progress. We report a case of GCP in polypoid types diagnosed by endoscopic polypectomy.

Stirling Engine의 開發을 위한 電算化에 관한 硏究

劉赫濟,李鍾元 慶熙大學校 1986 論文集 Vol.15 No.-

A Stirling engine is a mechanism used to convert heat into power and operates an a closed regenerative thermodynamic cycle with compression and expansion of the working fluid at different temperature. According to the classical theory the performance of a stirling cycle machine is a function of six independent parameters. namely; (1) speed (2) pressure of the working fluid, (3) ratio of the temperatures in the compression and expansion space, (4) ratio of the swept volumes in these two space, (5) phase angle, (6) volume of the heat exchangers and regenerator. The four parameters (3)∼(6) must be selected at the design state of the machine. The paper describes the procedure and presents the results of computations earned out to establish the optimum combinations of these for parameters for maximum engine output for the machine acting as a prime mover, over a combined temperature range from 300∼3000。K. The output of a stirling cycle machine can be expressed m terms of nondimensional power in several different ways. Four methods were studied in detail, the parameters optimized and design charts and shaft power charts prepared. Wide variations in the optimum parameter combinations were obtained and a partial explanation of this phenomenon is offered.

고속가공에서 2중 신경망을 이용한 표면거칠기 예측과 가공DB 구축 효율화 방안

원종률,남성호,유송민,이석우,최헌종 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-

In this paper, a double artificial neural network (ANN) approach and the efficient machining database building scheme are presented for the prediction of surface roughness in high-speed machining. In this approach, 4 machining parameters and used for the prediction of cutting force components, and the combinations of 4 parameters and the predicted cutting force components are finally used for the prediction of surface roughness. The experimental results comparing the these results with the predicted values using simple 4 input nodes have been also investigated to verify the effectiveness of the proposed approach.

국산 Avana 인공치아와 외국산 ITI 인공치아의 악골조직내 적합성에 관한 비교연구

유재하,이지웅,백성흠,정원균,김종배 大韓顎顔面成形再建外科學會 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.6

The purpose of this article is to confirm the longterm biocompatibility of national Avana implant and international ITI implant in dogs. At the fourth month after extreaction of the mandibular third and fourth premolar in three dog, both implants were inserted using careful atraumatic technique and prosthetic abutments were applied onto the implants in three months. After that, the implants were examined by naked eye and radiographic image every three months during 1 year, for detection of the complications, such as, mobility, bone resorption and wound infection. At 1 year after application of prosthetic abutment, the dogs were sacrificed for the histopathologic analysis by light microscope. The results obtained were as follows; 1. All implants had the ralatively good prognosis without mobility, wound infection and moderate bone resoprtion, in clinical and radiological evaluation during one year. 2. The all histopathologic specimens at one year after application of prosthetic abutment onto the implants showed the distinct osseointegration between implant system and bone, with projection of new bone apposition onto the peri-implant tissue. But Avana implants had the less osseointegration than ITI implants in the cancellous and marrow layer of jaw bone. 3. The all histopathologic specimens at one year after application of prosthetic device showed the firm junction by dense connective tissue pattern between the implant and the gingival portion. But Avana implants had the less firmer junction than ITI implants. 4. The authors confirmed that Avana implant and ITI implant have more higher tissue biocompatibility in dental implantation, but ITI implant has the more osseointegration than the Avana implant.

인쇄체 영문자·숫자·특수문자 인식을 위한 특징 추출에 관한 연구

유우종,박종원 충남대학교 자연과학연구소 1989 忠南科學硏究誌 Vol.16 No.2

This paper proposes new feature extraction and recognition method for alphanumeric and special characters printed in various type fonts. The method consists of two stages-feature extraction and recognition stages. This method is very capable of recognition multi-font printed alphanumeric and special characters and can correct the tilt input data. The recognition rate is 99.689% for the printed Bold, Roman, and Italic type faces.

멀티미디어 서버에서 효율적인 승인 제어 알고리즘 설계

元裕憲,朴勇,金鍾勳 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-

A server of client-server environments has to not only minimum delay time, but also realtime processing of job. Specially, multimedia systems are need to an efficient admission control algorithm, because of clients of big-size data need to maximum processing and realtime processing. In this paper, we propose an admission control algorithm that considers both realtime requests and non-realtime requests. The proposed algorithm minimizes delay time about requests of client and efficiently uses resources of system. Using comparisons between a previously proposed algorithm and the proposed algorithm we show that the proposed algorithm improves performance in the aspect of the delay time and consumed buffer size.

주파수 영역에서 다변수 제어 분석

유삼현,이종원 중앙대학교 생산공학연구소 1998 생산공학연구소 논문집 Vol.7 No.1

본 연구는 2개 이상의 입력과 출력으로 표현되는 다변수 시스템의 제어에 필요한 설계 요구 조건을 주파수 영역에서 분석하여 시스템에 적용하는 방법에 대하여 알아본다. 설계 요구 조건은 정상편차, 절점 주파수(cross-over frequency), 다변수에 의한 최대 및 최소 특이 값(singular value), 그리고 교란 및 잡음제거 등이며 목표 루프(target loop)는 Kalman 필터가 적용된다. 이러한 설계 요구 조건을 만족시키는 제어장치를 설계하는 주파수 영역에서의 분석은 LQG/LTR(Linear-Quadratic-Gaussian with Loop-Transfer-Recovery) 기술을 근거로 적용된다. 제어장치를 적용한 시스템의 폐루프 및 민감도 전달함수에 대한 특이 값을 주파수에 영역에서 분석하고 시간 영역에서 입력과 출력의 과도응답의 정확성과 반응속도에 대하여 알아본다. The main purpose of this study is an analysis of multi-variable control in frequency domain. This analysis is based on LQG(MBC)/LTR methodology. Target loop is designed by Kalman filter which includes the design specifications such as cross-over frequency, identification of maximum and minimum singular values, rejection of sensor noise in high frequency domain and disturbance in low frequency domain. Closed loop and sensitivity transfer function are analyzed by singular values in frequency domain and transient responses of input and output are also analyzed in time domain.

운동량변화가 온도변화가 있는 비정상 난류유동장에 미치는 영향

유근종,전원대,김수태 창원대학교 산업기술연구소 2001 産技硏論文集 Vol.15 No.-

In analysis of unsteady turbulent flows with temperature variation, 3 different turbulence models of k-e model, modified k-e model, and Full Reynolds Stress(FRS) model, are applied. 3 Test Cases are selected for verification. These are vertical jet flows with water and sodium, and parallel jet flow with sodium. For overall verification of turbulence models, test cases are analyzed with 2-D and 3-D assumptions. Analysis yields the conclusion that 3-D computation with FRS betters others. However, modified modeling for near wall effect is required to improve its heat transfer characteristic analysis.