자율주행 기록장치(DSSAD) 장착을 대비한 교통사고 조사방법 연구

박기정(Kijung Park),양정훈(Jeonghun Yang),천정환(Jeonghwan Cheon) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6

In the era of automated driving vehicles, it is necessary to prepare for the installation of DSSAD in traffic accident analysis. In this study, Real vehicle experiments about the operation of the Lane Keeping Assist System (LKAS) and Automated Emergency Braking System(AEBS) function are carried out by condition. According to the driving experiment, the AEBS function is not operated when the camera and radar are covered, and LKAS function is not operated if the lane is drawn in a zigzag shape. This experiment shows the characteristics of AEBS and LKAS, which are key technologies for automated driving. In order to prepare for the installation of DSSAD, If additional researches on malfunctions and limitations such as Adaptive Cruise Control(ASCC) and Smart Rear Crash Prevention Assistance (SBSD) are carried out, its use will be maximized in the automated driving vehicles accident analysis field.

지하주차장 보행안전 평가 프레임워크 개발 및 적용

한재성(Jaesung Han),박기정(Kijung Park) 대한인간공학회 2019 大韓人間工學會誌 Vol.38 No.3

Objective: This study aims to develop a pedestrian safety assessment model for underground parking facilities that comprehensively measure the pedestrian safety level of an underground parking facility. Background: Although underground parking spaces have many potential risks that can cause pedestrian accidents, assessment frameworks that enable to comprehensively measure and monitor the risk levels of underground parking facilities have not been widely discussed in the literature. In this regard, it is necessary to develop a safety assessment framework that can objectively and quantitatively capture the safety level in an underground parking facility. Method: 381 indicators that are associated with general pedestrian safety were extracted from the extant literature first. Then, these indicators were streamlined and standardized based on the importance of each indicator. Finally, a total of ten identified major indicators with sub-indicators and three safety factors categorizing these indicators were derived as a basis of a safety assessment framework. A weighted average scoring system using Analytic Hierarchy Process (AHP) was employed for the indicators measured in a Likert scale and their associated factors to quantify the overall safety level. The proposed framework was applied to a case study of a Korean university. Results: The results showed the overall safety level of the undergraduate parking facility at the university is in a range of "requiring minor treatment". However, the visibility factor had a low safety score, which requires immediate treatment. Based on the assessment results, a sensor system was proposed to improve the safety score of visibility. Conclusion: This study proposed an assessment framework that can objectively measure the safety level of an undergraduate parking space based on multi-criteria for pedestrian safety. The proposed framework can be a useful basis to continuously monitor the progress of underground-parking safety. Application: The proposed framework can be applied to any type of undergroundparking spaces.

데이터 기반 모바일 앱 분류 및 사용자 평가에 영향을 미치는 앱 속성 분석

김가연(Gayeon Kim),박기정(Kijung Park) 대한산업공학회 2020 대한산업공학회지 Vol.46 No.2

Nowadays a massive number of mobile apps are categorized and managed in an app store for users. However, ad-hoc category selection determined by app developers often causes ambiguous coverage across app categories. Also, the lack of understanding relationships between app attributes and user satisfaction leads to inappropriate app designs. Focusing on these issues, this study aims to provide objective app categorization and to identify significant app attributes for users. First, the text descriptions of more than 7,000 mobile apps in Apple’s iTunes were modeled through Latent Dirichlet Allocation. As a result, the existing 23 app categories were streamlined into seven categories. Next, relationships between app information and user rating data in each defined category were analyzed through Random Forest, and common features were identified as significant for user evaluation. The findings from this study provide implications for app categorization considering contextual similarities among apps and development of user-centered mobile apps.

용승구조물의 효율성 분석

홍남식(Hong Namseeg),박기정(Park Kijung) 동아대학교 해양자원연구소 2002 동아대학교 해양자원연구소 연구논문집 Vol.14 No.-

  This study investigates the efficiency of upwelling device proposed by Liu, according to the variation of a wave height, wave frequency, the length and sectional area of a tail pipe, and a buoy dimension. The mathematical and numerical model is again analyzed on the basis of Liu"s model. The results given through the parametric study indicate that an upwelling flow rate increases when a wave height, wave frequency, the length and sectional area of a tail pipe, and a buoy dimension increase.

가정간편식 고령친화성 평가 프레임워크 개발 및 적용

노희나(Heena Noh),박기정(Kijung Park) 대한산업공학회 2022 대한산업공학회지 Vol.48 No.1

Home Meal Replacement (HMR) products have received increasing attention in the food industry of Korea due to their convenience and cost-effectiveness to support nutrition for an aging population. However, a decision-making framework that can identify an elderly-friendly HMR has not been sufficiently discussed in the literature. As a response, this study proposes an evaluation framework that can properly measure the elderly-friendliness of HMR products. First, elderly food attributes were examined to define main evaluation criteria and sub-criteria for elderly-friendly HMRs. Then, a scoring scheme based on a Likert scale was defined for the evaluation score of each criterion. Finally, Analytic Hierarchy Process (AHP) and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) was employed to derive the total elder-friendliness score of each HMR alternative. The proposed framework was applied to evaluate the elderly-friendliness of commercial HMR products in Korea.

사출금형 형상부 가공용 CAM 파라미터의 최적결정

김성근(Seongkun Kim),박기정(Kijung Park),허영무(Yeongmoo Hur),양진석(JinSeok Yang) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11

In manufacturing of injection molds, Optimization of the parameters for CAM process<br/> is indispensable factor for reduction of processing time and quality improvements. But<br/> most of manufacturing companies have not their standard optimized CAM parameter.<br/> Normally the working process rely on experience and know-how of engineers. This<br/> paper suggest the algorithm for reduction of processing time and quality improvement<br/> through the optimizing program running on the commercial CAM program. The<br/> outcome was verified through experiments of real product .

사출금형 형상부 가공용 CAM 파라미터의 최적결정

김성근(Seongkun Kim),박기정(Kijung Park),허영무(Yeongmoo Hur),양진석(JinSeok Yang) 대한기계학회 2002 대한기계학회 기타 간행물 Vol.2002 No.11

지진대피소 선정 평가 프레임워크 개발 및 적용

김나형(Kim, Nahyeong),주정원(Joo, Jeongwon),김민영(Kim, Minyeong),박기정(Park, Kijung) 한국방재학회 2020 한국방재학회논문집 Vol.20 No.2

최근 국내 지진으로 인해 지진 대피소에 대한 중요성이 강조되고 있지만, 기존 국내 지진 대피소 지정 기준이 모호하며 체계적인 절차가 없어 적절한 대피소 지정이 어려운 실정이다. 이에 본 연구는 다기준 의사결정 기반 객관적이고 정량적인 지진 대피소 선정평가 프레임워크를 제안하고, 인천광역시 송도동 지진대피소 사례연구를 통해 적용 방법을 제시하고자 한다. 먼저 문헌 연구를 통해 대피소 평가 관련 지표를 추출하였고 텍스트마이닝을 사용하여 정제 및 그룹화를 통해 평가영역을 도출한다. 선택된 평가 지표는 균일한 점수 범위를 갖도록 표준화하였고, AHP 방법을 통한 각 평가영역의 상대적 가중치를 통해 지진대피소에 최종 평가점수가 도출된다. 사례연구 결과, 기존 대피소와 더불어 지진대피소로 적합한 추가 후보지를 식별할 수 있었다. 본 연구는 체계적인 지진대피소 지정 프로세스의 기반이 될 수 있으며, 지진대피소 선정평가 업무에 실용적으로 적용 및 지정된 대피소에 효용성을 확보하는데 공헌한다. The importance of designated earthquake shelters has been emphasized in South Korea. However, the lack of an appropriate evaluation process for shelter candidates often leads to an ad-hoc selection of earthquake shelters, resulting in inefficient disaster management. To address this issue, this study proposes an evaluation framework based on multi-criteria decision-making to measure the suitability of earthquake shelters quantitatively. First, available indicators for shelter evaluation are extracted from the relevant literature, which are then streamlined and grouped using text mining to represent evaluation areas. Next, the selected indicators are standardized to the same value scale, and the Analytic Hierarchy Process (AHP) is used to derive the relative importance of each evaluation area to compute the weighted sum total score of each candidate. The developed evaluation framework is applied to a case study of earthquake shelter selection in the city of Songdo-dong. The results show that there are additional shelter candidates suitable for earthquake evacuation in addition to the current designated shelters. This study can serve as a basis for objective shelter selection that would improve the identification and utility of designated shelters.

용승구조물의 효율성 분석

홍남식,박기정 東亞大學校 海洋資源硏究所 2002 硏究論文集 Vol.14 No.1

This study investigates the efficiency of upwelling device proposed by Liu, according to the variation of a wave height, wave frequency, the length and sectional area of a tail pipe, and a buoy dimension. The mathematical and numerical model is again analyzed on the basis of Liu's model. The results given through the parametric study indicate that an upwelling flow rate increases when a wave height, wave frequency, the length and sectional area of a tail pipe, and a buoy dimension increase.