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김원철 한국도로학회 2018 한국도로학회논문집 Vol.20 No.6
PURPOSES: The purpose of this study is to analyze the elderly's preference for ride hailing (car sharing) services that use non-commercial vehicles and to identify the crucial factors influencing this preference. METHODS : Based on a literature review, a questionnaire was made to explore the preference of the elderly (over 65 years old) for ride hailing services. The survey was conducted in a rural area in Chungcheongnam-do. A total of 210 completed questionnaires were obtained. A binary probit model was applied to estimate the preference choice behavior. RESULTS: Monthly income, gender, age, and the time it takes to walk to the nearest bus stop were the main factors that influenced the preference for ride hailing services. The preference for ride hailing is likely to decrease when the monthly income of the elderly increase, and increase when the nearest bus stop is far away or as people get older. In addition, women had a stronger preference for ride hailing than men. CONCLUSIONS : For the elderly, ride hailing services can help them maintain their mobility and could be one of the countermeasures for demand-responsive transport from a sustainable perspective.
13:1의 압축비를 갖는 축류-원심형 압축기의 기본 공력설계
김원철 한국군사과학기술학회 2003 한국군사과학기술학회지 Vol.6 No.2
Preliminary aerodynamic design of a compressor is carried out to meet the design requirements which are pressure ratio of 13, air mass flow rate of 4 ㎏/s and rotational speed of 45,000 rpm. The compressor type is chosen as an axial-centrifugal compressor from the design requirements which is suitable for a medium power class turboprop or turboshaft engine. Its overall isentropic efficiency is estimated to be 0.796 and its surge margin to be 20% exceeding the design requirement. This paper summarizes the aerodynamic design details including the design procedures and the results of the axial -centrifugal compressor.
무선 환경에서 사용자 검색 성향을 반영한 웹 방송 정보 재구성 기법
김원철,이수철,황인준,변광준 한국정보처리학회 2004 정보처리학회논문지D Vol.11 No.6
Today the fastest growing communities of web users are mobile visitors who browse web page with wireless PDAs and cellular phones. However, most web pages are optimized exclusively for desktop clients on the broadband network and are inconvenient to users with small screen mobile devices. They display only a few lines of text and cannot run client-side programs or scripts due to lack of system resource. Even worse, their connections are usually slow to support most of the data-intensive applications. In this paper, we propose a pageslet scheme that makes it feasible to browse ordinary web pages on small screen mobile devices. It extracts broadcasting sections of user preference from broadcasting web pages and automatically reorganizes the extracted sections for convenient browsing on mobile devices. 최근 다양한 무선 단말기의 보급과 네트워크 기술의 발전으로 인하여 무선 단말기를 이용한 인터넷 접속이 보편화되고 있다. 특히 디지털 방송의 도입에 따른 다양한 방송 프로그램과 방송사 뉴스 서비스는 무선 단말기의 제한된 환경에서의 이용률이 높다. 그러나 대부분의 방송사 웹 페이지들은 한 페이지에 많은 내용으로 인한 세분화된 섹션을 담고 있기 때문에 제한된 화면과 입력장치를 가진 무선 단말기를 이용하여 사용자가 원하는 부분에 접근하기까지 반복적인 스크롤링을 해야 하는 불편함이 있다. 이러한 문제를 해결하기 위해 본 논문에서는 방송사 웹 페이지 내에서 실시간으로 사용자가 선호하는 방송사 웹 페이지의 섹션을 추출하고, 무선 환경에 적합하도록 각 섹션의 순서를 재구성하여 무선 단말기에 제공해 주는 기법을 제안한다. 제안된 기법을 통해 사용자는 무선 단말기의 단점을 극복함과 동시에 방송사 웹에서 선호하는 섹션의 맞춤형 방송사 웹 서비스를 제공받을 수 있다.
김원철,박재명,오정환,한혜원,조유경,정정조,이인석,김상우,최명규,최규용,정인식 대한소화기내시경학회 2005 Clinical Endoscopy Vol.31 No.3
Colonic irrigation is a procedure in which large quantities of liquids are infused into the colon via the rectum through a tube, in an effort to wash away and remove fecal materials. Liquids mostly used in colonics include water and coffee. This procedure has been performed generally in the alternative medicine community and becomes more popular in recent years. However, physicians criticize its potential hazards by insisting that there are not of any scientifically proven health benefit of this procedure. With the current popularity of colonic irrigation, it is important to investigate the adverse effect of colonic irrigation which has not been known or published yet. We report a case of 56 years old female with colonic injury after colonic irrigation. 장세척이란 물이나 커피 등의 수액을 직장을 통해 높은 수압으로 주입과 배출을 반복하면서 장내 노폐물을 제거하는 시술이다. 지금까지 주로 대체의학계를 중심으로 시행되어 왔으며 최근에는 국내에서도 한의원을 중심으로 선풍적으로 유행하고 있다. 하지만 많은 연구에도 불구하고 그 효과를 입증하지 못했고 치명적인 부작용의 가능성 때문에 의료계 내에서는 장세척에 대해서 비판적인 시각을 가지고 있다. 최근 장세척이 유행함에 따라 부작용에 대한 연구와 고찰이 중요하게 되었지만 아직 이에 대한 공식적인 보고는 많지 않았다. 장세척 후의 부작용은 국외에서는 천공과 패혈증이 발생한 증례 보고가 있었지만 국내에서는 아직 보고된 바 없다. 저자들은 장세척 이후 복통, 설사 및 혈변을 주소로 내원한 56세 여자환자에게서 S상 결장에 발생한 장손상 1예를 경험하였기에 이를 보고하는 바이다.
대체안전지표를 활용한 일방통행제 교통안전도 평가에 관한 연구
김원철 한국도로학회 2023 한국도로학회논문집 Vol.25 No.4
PURPOSES : This study establishes a methodology for evaluating traffic safety in response to the introduction of one-way traffic using surrogate safety measures and analyzes the impact of one-way traffic safety through a case analysis. METHODS : The SSAM(Surrogate Safety Assessment Measure) was used to analyze traffic conflicts (TTC(Time to Collision) and PET(Post Encroachment Time)), which are safety indicators. The SSAM input variable dataset was constructed using a VISSIM(Verkehr In Städten - SIMulationsmodell) simulation. RESULTS : Introducing one-way traffic rather than the pending issue (two-way operation) improved traffic safety as the possibility of TTC or PET was reduced. In addition, the analysis results showed that the average TTC time and average PET time increased with the introduction of the one-way system. It is anticipated that the avoidance action time taken by the driver to avoid dangerous situations will also increase, which will help improve traffic safety. CONCLUSIONS : As an alternative to solving traffic safety and communication problems occurring at the study site, it was determined that a one-way system would be effective. Furthermore, a one-way system that allows two-lane roads on both sides to move one-way and allows parking in pockets on both sides of the road would be appropriate.