A Development of Hotel Bankruptcy Prediction Model on Artificial Neural Network

Sung-Ju Choi(최성주),Sang-Won Lee(이상원) 한국컴퓨터정보학회 2014 韓國컴퓨터情報學會論文誌 Vol.19 No.10

본 논문에서는 호텔경영을 위한 인공신경망 기반의 부도예측 모형을 개발한다. 부도예측 모형은 호텔에서 관리하는 사업장의 사업성과 이터를 바탕으로 부도 가능성을 평가하여 호텔 전체사업의 부도를 예측하는 특징을 가진다. 부도예측을 위한 전통적인 통계기법은 다변량 판별분석이나 로짓분석 등이 있는데, 본연구는 이들보다 우수한 예측정확성을 갖는 인공신경망 기법을 이용해서 연구를 진행하였다. 이를 위해 우선 우수기업 100개와 도산기업 100개를 선정하여 전체 실험데이터를 구성하고, 뉴로쉘이라는 인공신경망 도구를 이용하여 부도예측모형을 구성하였다. 본 모형 설계와 실험은 서비스드 레지던스 호텔에서 관리하는 각 브랜치의 부도예측과 재무건전성을 판단하기에 효율성이 높아 호텔 경영의 의사결정에 많은 도움이 될 것이다. This paper develops a bankruptcy prediction model on an Artificial Neural Network for hotel management. A bankruptcy prediction model has a specific feature to predict a bankruptcy of the whole hotel business after evaluate bankruptcy possibility on the basis of business performance data of each branch. here are many traditional statistical models for bankruptcy prediction such as Multivariate Discriminant Analysis or Logit Analysis. However, we chose Artificial Neural Network because the method has accuracy rates of prediction better than those of other methods. We first selected 100 good enterprises and 100 bankrupt enterprises as experimental data and set up a bankruptcy prediction model by use of a tool for Artificial Neural Network, NeuroShell. The model and its experiments, which demonstrated high efficiency, can certainly provide great help in decision making in the field of hotel management and in deciding on the bankruptcy or financial solidity of each branch of serviced residence hotel.

사출성형을 이용한 미세 패턴 성형의 충진 해석

최성주(Sung-Ju Choi),김선경(Sun-Kyoung Kim),유영은(Yeong-Eun Yoo),이관희(Kwan-Hee Lee),제태진(Tae-Jin Je),최두선(Doo-Sun Choi) 한국소성가공학회 2008 미세가공 심포지엄 Vol.2008 No.4

자기조립 펩타이드 나노구조체

최성주(Sung Ju Choi),한상헌(Sang Hun Han),임용범(Yong Beom Lim) 한국고분자학회 2012 고분자 과학과 기술 Vol.23 No.3

고등학교 태권도 수업 참여에 따른 신체적 자기효능감이 학교생활 만족도에 미치는 영향

이진우(Jin Woo Lee),최성주(Sung Ju Choi),차여진(Yeo Jin Cha),김남중(Nam Jung Kim),김승철(Seung Chu Kim),이경현(Kyoung Hyun Lee) 한국사회체육학회 2014 한국사회체육학회지 Vol.0 No.56

The aim of this study was to identify the influence of Taekwondo class on Physical Self-efficacy (PSE) and School Life Satisfaction (total SLS) of high school students. The subjects were divided into three groups (non-participation group, one year group, and two year group). The data analysis was conducted suing the PASW statistics 18.0 with factor analysis, one-way ANOVA, and simple regression analysis, and Scheffe’s post-hoc applied if when the results showed a significantly difference. The result showed that (1) two year group was significantly different than the other groups on perceived physical ability of PSE but not on physical self-presentation confidence of PSE, (2) one and two year groups were significantly higher than the other one on friend, school life, teacher, and class satisfactions of total SLS however the one was significantly higher than the two groups on school event participation satisfaction, and no difference was showed up on school environment satisfaction, and (3) school event participation, school environment, friend, and teacher satisfactions of total SLS were positively influenced by perceived physical ability and friend satisfaction of total SLS were positively influenced by physical self-presentation confidence of PSE however school event participation and school environment satisfactions were negatively influenced. The results of this research indicate the importance of physical activities and highlight the benefits of participating Teakwondo class for high school students.

웨이퍼 단면 연삭기 구조물의 최적설계 및 강성평가

최영휴(Young-Hyu Choi),김인수(In-Su Kim),최성주(Seong-Ju Choi),하상백(Sang-Baek Ha),안대균(Dae-Kyun Ahn) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6

In this paper, an optimum design method based on G.A. with variable penalty was applied to the structural design optimization of a wafer grinding machine for minimum weight and maximum stiffness. The contradictive objectives were converted into a single objective function by using weighting method and introducing compliance instead of stiffness. The design optimization conducts static- and dynamic-optimizations successively. In the dynamic optimization, the solution having best fitness is selected among GDS(Good Design Solution set), which is the set of solutions having relatively higher fitness. GDS is obtained from static design optimization process. after design optimization, the dynamic compliance of the machine structure was reduced by 14.6% with a little increase of weight by 2.3% than before. The measured compliance of the optimum designed wafer grinding machine showed good agreement with the theoretical optimization result.

사출 성형에서의 미세 패턴 전사성 차이에 관한 실험적 연구

김태훈(Tae-Hoon Kim),유영은(Yeong-Eun Yoo),최두선(Doo-Sun Choi),제태진(Tae-Jin Je),박영우(Yeong-Woo Park),최성주(Sung-Ju Choi) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6

We injection molded a wedge type of plate with micro prizm patterns on its surface and investigated the fidelity of replication of the micro pattern depending on the process parameter such as mold temperature, melt temperature, injection rate or packing pressure. The size of the 90° prizm pattern is 50㎛ and the size of the plate is about 300㎜×200㎜. The thicknesses are 2.6㎜ and 0.7㎜ at each edge of the wedge type of plate. The fidelity of the replication turned out quite different according to the process parameters and location of the patterns on the plate. We measured the cavity pressure and temperature in real-time during the molding to analyze the effect of the local melt pressure and temperature on the micro pattern replication.

RFID TAG 미세패턴 성형을 위한 공구혼 진동해석

김강은(Kang-Eun Kim),이봉구(Bong-Gu Lee),최성주(Sung-Ju Choi) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.12

본 논문에서는 유한 요소법(FEM) 시뮬레이션을 사용하여 초음파 미세패턴 성형에 사용되는 초음파 공구혼을 이론적 연구와 유한요소해석을 통하여 조사 하였다. 이 방법은 FEM 해석으로 얻어진 초기 설계 추정치에 기초한다. 초음파 미세패턴 성형에 필요한 고유주파수와 공구 혼의 공진주파수를 유한요소해석을 통하여 예측하였다. ANSYS S/W를 이용한 FEM 분석은 초음파 혼의 진동모드 형상의 최적 설계기술로 공진 주파수를 예측하기 위해 사용하였다. 초음파 진동자에 전원이 공급되면, 초음파 진동자에 공급된 전기에너지가 기계적인 운동에너지로 변환되어 진동이 발생하게 된다. 초음파 공구혼의 종진동 에너지를 이용하여 절연시트위에 RFID TAG 패턴 성형을 하게 된다. 초음파 진동을 이용한 마이크로 단위의 형상정밀도 향상을 위해서는 공구혼의 종진동모드만을 이용하여 성형 해야 한다. 본 연구에서는 초음파 마이크로패턴 성형에 필요한 공구혼의 고유진동수 및 진동모드를 갖는 설계변수를 고찰하고, 유한요소해석 결과를 바탕으로 공구혼을 제작함으로써 마이크로패턴 성형에 응용하고자 한다. 유한요소해석 결과를 바탕으로 RFID TAG의 미세패턴 성형을 위한 초음파 공구혼의 최적설계 및 제작에 반영하였다. In this paper, the theoretical research and simulation using the Finite Element Method (FEM) to design and form a micro-pattern for an ultrasonic horn is described. The present method is based on an initial design estimate obtained by FEM analysis. The natural and resonant frequencies required for the ultrasonic tool horn used for forming the fine pattern were predicted by finite element analysis. FEM analysis using ANSYS S/W was used to predict the resonant frequency for the optimum technical design of the ultrasonic horn vibration mode shape. When electrical power is supplied to the ultrasonic transducer, it is converted into mechanical movement energy, leading to vibration. The RFID TAG becomes the pattern formed on the insulating sheet by using the longitudinal vibration energy of the ultrasonic tool horn. The FEM analysis result is then incorporated into the optimal design and manufacturing of the ultrasonic tool horn.

나노 Hair 어레이 제작을 위한 사출 성형 기술 개발

유영은(Yeong-Eun Yoo),김태훈(Tae-hoon Kim),최성주(Sung-Ju Choi),서영호(Young Ho Seo),최두선(Doo-Sun Choi),황경현(Kyung Hyun Hwang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11

High aspect ratio of nano hair array on a plastic substrate is injection molded using thermoplatic materials. The diameter of the hairmolded is about 200㎚ and the length is 2㎛ ~ 10㎛, so the aspect ratio is over 10. As a template for molding, two types of AAO(Aluminum Anodizing Oxide) plate are adopted. One is though-hole type of which the thickness is about 60㎛ and another is intaglio hole type on the Al plate of about 2㎜ thickness. The overall dimension of the molded substrate with nano hair array on its surface is about 10㎜ for diameter and about 1mm for thickness. COC(Cyclic Olefin Copolymer) is used due to its goodmoldability andmechanical properties.

태권도 세부종목별 스포츠자신감이 운동정서에 미치는 영향

김만수(Kim, Man-Soo),김남중(Kim, Nam-Jung),김근국(Kim, Geun-Kook),최성주(Choi, Sung-Ju),김범준(Kim, Bum-Jun),김승철(Kim, Seung-Chul) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.2

This study aims to explore the differences in confidence of players in each Taekwondo event and examine how confidence affects their sports emotion. For this study, 5 universities (H, K1, Y, K2, N) and Taekwond O players were selected among those who participated in competition hosted by collegiate Taekwondo federation in Goseong, Gangwon-do in October of 2014 that lasted for one month. Purposive and convenience sampling methods were used to collect 358 questionnaires, while only 340 of which were used in final analysis as 18 were either incomplete or overlapping. Collected data were processed using PASW 18.0 program, and the following conclusion was reached, First, as to differences in sports confidence and exercise emotion by individual characteristics, all factors revealed significant difference excluding physical preparation of confidence by gender. Second, Regarding year levels, players in their junior year showed more vitality than other those in other year levels. Participants in poomsae and demonstration Taekwondo revealed significantly different level of confidence, composure, enjoyment, pride, and vitality from participants in gyeorugi. Third, sports confidence of Taekwondo players significantly affected some parts of exercise emotion.