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김정일,김병권,김정원,채창호,이철호,강동묵,김지홍,김진하,김영욱,이영하,이지호,김정호,윤형렬,유철인,정백근,장태원,김운규,윤동영,강진욱,김종은,안진홍,이동준,장준호,이광영,송혜란,최영희,이용환,조병만,최홍렬,고상백,김은아,이유진,홍영습,정갑열,김정만,김준연 大韓産業醫學會 2004 대한직업환경의학회지 Vol.16 No.1
Objective: Occupational medicine specialists in the Busan, Ulsan and Kyung-Nam areas established an area-based occupational disease surveillance system and used this system to collected case information for the purpose of preventing occupational diseases Methods: l l hospital participated in this system. The authors selected five main diseases, which were hand-arm vibration syndrome (HAVS), work-related musculoskeletal disorder (WRMSD), occupational asthma, occupational skin disease and occupational and occupational lung cancer and established their case definitions. All cases were reported on the web, and real time analysis was conducted. Results: Between April 2001 and April 2003, 192 cases of HAVS, 118 cases of WRMSD, 33 cases of occupational asthma, 17 cases of occupational skin disease and 17 cases of occupational lung cancer (for a total of 377 cases of these five main diseases) were reported. most of the HAVS cases came from shipbuilding, and 172 of them (92.7%) were associated with grinding. Of the four main types of WRMSD, carpal tunnel syndrome (CTS) was the most prevalent with 46 cases and shipbuilding was also the main industry involved (83.9%). The ergonomic risk factors involved mainly associated with the hand. In 19 (57.6%) and 4 (12.1%) cases of occupational asthma, the agents involved. The causative agents of occupational lung cancer included Cr, welding fume, PAH, Ni, etc. 10(58.8%) of the cases were diagnosed as squamous cell carcinoma and 5(29.4%) as adenoma. Conclusion: This result showed that an area-based occupational disease surveillance system might provide an effective method of evaluating the prevalence of such diseases, however the Busan, Ulsan and Kyung-Nam provinces are too large to be treated as individual areas. Therefore, the authors suggest that each province should establish its own surveillance system.
Baek, Jong Yun,Yu, Jeong Il,Park, Hee Chul,Choi, Doo Ho,Yoo, Gyu Sang,Cho, Won Kyung,Lee, Woo-Yong,Yun, Seong Hyeon,Cho, Yong Beom,Park, Yoon Ah,Kim, Hee Cheol The Korean Society for Radiation Oncology 2019 Radiation Oncology Journal Vol.37 No.2
Purpose: This study aimed to identify prognostic factors for locoregional recurrence (LRR) in pT3N0 rectal cancer patients who were treated with surgery alone and had negative resection margin including circumferential resection margin (CRM) for optimal indication of adjuvant radiotherapy. Materials and Methods: We reviewed patients with pT3N0 rectal cancer who were treated via upfront surgery and had no other adjuvant treatment from January 2003 to December 2012. In total, 122 patients who had negative resection margin including negative CRM were included in the analysis. Results: The median follow-up period after surgery was 60 months (range, 3 to 161 months). During this time, 6 patients (4.9%) experienced LRR at the anastomotic site (4 patients), and regional lymphatic area (2 patients). The estimated 5-year rates of overall survival, recurrence-free survival, and LRR-free survival were 96.7%, 84.6%, and 94.0%, respectively. Multivariate analysis showed that level of tumor ≤5 cm was a significant prognostic factor for LRR-free survival (LRRFS) (p = 0.04; hazard ratio = 7.08; 95% confidence interval, 1.06-47.30). Patients with level of tumor ≤5 cm had an estimated 5-year LRRFS of 66.8%, which was much higher than 2.3% in patients with level of tumor >5 cm. There was no significant factor for recurrence-free survival or overall survival. Conclusion: In T3N0 rectal cancer, adjuvant chemoradiotherapy should be recommended in patients with level of tumor ≤5 cm for better local control. However, in patients with pT3N0 disease, negative resection margin, and level of tumor >5 cm, adjuvant chemoradiotherapy should be carefully suggested.
백윤철 ( Yun Cheol Baek ) 상명대학교 소프트웨어·미디어연구소 2003 소프트웨어 미디어연구 Vol.2003 No.1
현대에 있어 인터넷의 사용은 웹 서버와 클라이언트 간의 HTTP(Hyper-Text Transfer Protocol) 트래픽으로 대표되며, 웹 서버의 병목과 네트워크의 지연을 줄여 사용자 응답 시간을 개선하고자 하는 노력으로 웹 캐싱이 대두되었다. 본 논문에서는 웹 캐시 네트워크의 서버 부하 분산으로 인한 응답 시간 개선의 효과를 거시적인 관점에서 관찰하고 분석하였다. In our time, HTTP traffics between web servers and clients are typical pattern of Internet usage. Web caching is emerged for enhancing the user response time by reducing web server requests and network latency. In this paper, we observe and analyze the effectiveness of server load balancing capability of web cache network on reducing response time.
비중단 실시간 스케쥴링을 이용한 연속적인 미디어 화일 서버 설계시의 고려 사항
백윤철(Yun-Cheol Baek),고건(Kern Koh) 한국정보과학회 1995 정보과학회논문지 Vol.22 No.2
연속적인 미디어 (continuous media: CM)란 디지틀 오디오, 비디오 등의 강한 시간적인 제약 조건을 가지는 미디어를 말한다. CM 화일 서버 (file server)는 CM 데이타에 대한 검색 요청을 그들의 시간적 특성에 맞게 실시간적으로 지원해야 한다. 그러나, CM 화일 서버에 대한 기존의 연구들은 클라이언트가 요청한 디스크 블럭을 공급해 주기 위해 실시간 스케쥴링 기법을 사용하지 않는다. 본 논문에서는 비중단 마감 시간 우선 (non-preemptive Earliest Deadline First) 스케쥴링 방법을 CM 화일 서버의 디스크 스케쥴링 방법으로 사용할 때, 필요한 버퍼 공간, 디스크 상에서의 화일의 배치, 주어진 시스템 환경 하에서 생성 가능한 최대 세션 (session) 수 등을 분석하여 연속적인 미디어 시스템 구축에 유용한 기준을 제시한다. Continuous media (CM) means the media like digital audio and video that has strong timing constraints. CM file server must support real-time retrieval of CM data according to their timing requirements. Many previous works on CM file server do not use real-time scheduling technique for supplying data blocks requested by a client. In this paper, we suggest the useful criteria for building multimedia systems by analyzing buffer space requirements, disk layout and the maximum number of sessions on given system environments when non-preemptive Earliest Deadline First is used for the disk scheduling policy of the CM file server.
한자 무빙 타이포그래피의 감성적측면에 관한 연구 -전서, 해서, 초서체를 중심으로-
백윤철 ( Yun Cheol Baek ),이애리 ( Ae Lee Lee ) 상명대학교 소프트웨어·미디어연구소 2004 소프트웨어 미디어연구 Vol.2004 No.2
현재 중국은 우리 문화 콘텐츠 산업의 큰 시장이며 한자(漢子)는 중국인들에게 문화 콘텐츠를 전달하는 중요한 요소이다. 한류(韓流) 열풍 선봉에 있는 TV 드라마, 영화, 뮤직비디오 등 영상물의 한자 무빙 타이포그래피(moving typography)또한 중요한 비쥬얼 커뮤니케이션(Visual communication)으로 중대성이 점차 확대되고 있다. 그러나 한자 무빙 타이포그래피에 관한 연구는 거의 이루어지고 있는 않는 실정이다. 이에 한자의 자형변천에 따라 크게 전서(篆書), 해서(楷書), 초서(草書)로 서체를 분류하고 각각 무빙 타이포그래피를 적용함으로서 느껴지는 감성(感性)을 분석하였다. Currently, China is big market of our culture contents industry and Chinese character is important element that communicates culture contents to Chineses. TV drama, movie, music video etc. are in the van of Korea wave and importance of moving typography on Chinese character of the video image, as visual communication, is expanded gradually. But there is no study for moving typography on Chinese character currently. Because of that, the handwriting is classified as seal character style, square style and cursive style according to the changes of character style. And sensitivity, which is felt by applying moving typography, is analyzed.
연속적인 미디어의 검색을 위한 비중단 실시간 태스크의 스케쥴 가능성 분석
백윤철(Yun-Cheol Baek),고건(Kern Koh) 한국정보과학회 1994 정보과학회논문지 Vol.21 No.7
실시간 시스템에서는 경성 실시간 태스크(hard real-time task)의 수행을 마감 시간(deadline)전에 하도록 보장하는 태스크 스케쥴링이 가장 중요하며, 그 방법을 적용할 때의 프로세서 이용률(utilization)과 임의의 태스크 집합이 그 스케쥴링 기법에 의해 스케쥴 가능한가에 대한 검사 역시 중요하다. 주기적인(periodic) 태스크 집합을 마감 시간 우선(Earliest Deadline First)기법을 사용하여 태스크가 비중단적으로 수행하도록 스케쥴하면 프로세서의 이용률이 100%인 스케쥴링을 할 수는 있지만 스케쥴 가능성에 대한 검사 알고리즘은 NP-hard임이 알려져 있다. 본 논문에서는 수행 시간이 동일한 태스크 집합과 주기가 동일한 태스크의 집합을 마감 시간 우선으로 비중단 스케쥴링할 때, 각각 O(1)의 시간이 요구되는 스케쥴 가능성 검사만으로 프로세서 이용률을 극대화할 수 있음을 보인다. 또한 제안된 스케쥴 가능성 검사가 멀티미디어 시스템(multimedia system)에서 연속적인 미디어 검색(continuous media retrieval) 요청의 스케쥴링에 사용될 수 있음을 보인다. In real-time systems, task scheduling should guarantee that each hard real-time task complete execution before its deadline The processor utilization of a scheduling algorithm and its schedulability test for an arbitrary set of tasks are also important problems When non-preemptive Earliest Deadline First (EDF) scheduling is used for a set of periodic tasks, one can achieve the full utilization of a processor, but its schedulability test is known to be an NP-hard problem. In this paper, we examine 0(1) on-line schedulability tests for a set of tasks with equal computation time and for a. set of tasks with equal period using non-preemptive EDF algorithm We also demonstrate that these results can be used for scheduling the requests of continuous media (CM) retrieval in multimedia systems.