21세기를 향한 공장혁신 방향

장병철 한국제품안전협회 1994 제품안전 Vol.25 No.-

기업은 변화에 빠른 업체만이 살아 남게 되며 변화하는 업체가 21세기를 향하는 기업이 될 것이다. 공장혁신은 의식혁신, 생산성혁신, 기술혁신의 3대혁신을 축으로 한다. 어느 한쪽도 치우쳐지면 21세기를 향하기 어렵다

64채널 심장전기도 시스템 구현에 관한 연구

장병철,김남현 대한의용생체공학회 1995 의공학회지 Vol.16 No.1

It is well known that multipoint and computerized intraoperative mapping systems improve the results of surgery for Wolff-Parkinson-White syndrome and show tremendous potential for opening an entirely new era of surgical intervention for the more common and lethal types of supraventricular tachyarrhythmias such as atrial flutter and atrial fibrillation. In addition, the ability to map and ablate the sometimes fleeting automatic atrial tachycardia is greatly enhanced by computerized mapping systems. In this study, we have developed 64 channel computerized data analysis system using microcomputer (Macintosh ${II}_{x}$) for basic research of electrophysiology and electrical propagation. The bipolar electrogram information is acquired from 64 cardiac sites simultaneously at a sampling rate of 1 ksampls/sec with continuous and total data storage of up to 30 seconds. When the reference electrogram is selected and reference point is picked up, delay time from the reference point is displayed on two dimensional diagram of the heart. System design permits easy expansion to almost 256 simultaneous sites. this system is expected to enable us to study pathophysiology of cardiac arrhythmia and to improve the result of diagnosis and surgical treatment for cardiac arrhythmia.

UDP/IP 메시지 전송의 QoS 성능 향상을 위한 IP Over USB

장병철,박현희,양승민,Jang, Byung-Chul,Park, Hyeon-Hui,Yang, Seung-Min 한국정보처리학회 2007 정보처리학회논문지 A Vol.14 No.5

임베디드 리눅스 기반의 휴대폰, PDA, MP3 플레이어 등의 소형 내장시스템이 널리 사용되고 있다. 이러한 소형 내장시스템에서 컴퓨터 또는 주변장치와의 데이터 통신을 위한 인터페이스 중에는 USB(Universal Serial Bus)가 있다. 특히 지능형 홈 네트워킹 및 멀티미디어 스트리밍을 지원하는 소형 내장시스템에서는 USB를 통한 UDP/IP 메시지를 실시간으로 전송하기 위한 서비스품질(Quality of Service)의 보장을 요구한다. 리눅스에서는 USB Gadget API 기반의 USB 이더넷 드라이버를 지원하고 있지만 TCP/IP Stack에서의 비 예측성으로 인하여 내장시스템에서 요구하는 QoS를 제공하지 못하고 있다. 본 연구에서는 USB와 리눅스를 사용하는 내장시스템에서 UDP/IP 메시지 전송 시의 QoS 성능 향상을 위한 프레임워크인 IP-Over-USB를 제안한다. The Linux-based embedded systems such as mobile telephones. PDAs and MP3 players are widely in use. USB(Universal Serial Bus) is the interface for data communication between the computers and these peripheral devices. Some embedded systems like intelligent home networking and multimedia streaming require guaranteed QoS(Quality of Service), which is needed for real time transmission of UDP/IP messages through USB. Although USB Ethernet driver is supported by USB Gadget API in Linux, it is unable to provide the desirable QoS required by each type or small embedded systems due to the unpredictability or TCP/IP Stack in Linux. This paper proposes IP-Over-USB to improve QoS of UDP/IP message transmission in the embedded systems using USB in Linux system.

마이크로 컴퓨터를 이용한 다중 채널 심장 전기도 시스템 개발 ( Development of Multi-Channel Cardiac Mapping System Using Microcomputer )

장병철,김원기,김남현,정성헌 대한전자공학회 1991 대한전자공학회 학술대회 Vol.1991 No.5

모범공무원수기 : 경지정리로 마을 개발에 공헌

장병철 대한지방행정공제회 1970 地方行政 Vol.19 No.204

Historical Perspectives of the Korean Society for Thoracic and Cardiovascular Surgery: Pill Whoon Hong (1921–2004), A Pioneer in Cardiothoracic Surgery in Korea

장병철,박국양,Cho Bum Koo 대한심장혈관흉부외과학회 2023 Journal of Chest Surgery (J Chest Surg) Vol.56 No.1

유비쿼터스병원 운영사례-1)연세대학교 의료원Ubiquitous-Hospital(u-SMART)

장병철,Jang, Byeong-Cheol 대한병원협회 2007 대한병원협회지 Vol.36 No.5

[국방논단] 이스라엘-하마스 기습공격을 통한 우리의 비대칭 대응에 관한 고찰

장병철,권혁진 한국방위산업진흥회 2023 國防과 技術 Vol.- No.538

다단계 알고리즘을 이용한 개인화 상품추천

장병철,최덕원,이동철,Chang, Byeong-Cheol,Choi, Doug-W.,Lee, Dong-Cheol 한국정보처리학회 2003 정보처리학회논문지D Vol.10 No.7

많은 사이버 쇼핑몰들은 다양한 추천 방법을 도입하여 상품을 추천하고 있다. 상세한 알고리즘은 공개되어 있지 않지만 대부분 비교적 단순한 알고리즘을 쓰고 있다. 본 연구는 상품 자체의 특성, 소비자 집단의 특성, 그리고 소비자 개인의 특성을 고려한 다단계 알고리즘을 이용하여 상품추천 능력을 향상시키고자 시도하였다. 소비자와 관련된 더 많은 요인을 고려함에 따라 상품추천의 내용이 변화하는 사례를 도표로 비교 예시하였다. Many cyber-shopping malls use various commodity recommendation methods. Although the detailed algorithms are not disclosed to the public, they mostly rely on relatively simple and straightforward methods. This paper intends to improve the commodity recommendation by using a multi-stage algorithm which considers factors that are characteristics of the commodity itself, of the consumer group, and of the individual customer. A comparison table is provided which shows whether there is a change in commodity recommendation as we consider more factors about the customer.

개심수술후 심장부정맥에 대한 임상적 연구: 원인,빈도 및 치료

장병철 대한흉부심장혈관외과학회 1991 Journal of Chest Surgery Vol.24 No.9

We prospectively studied postoperative cardiac arrhythmia after open heart surgery to analyze the types and incidence of cardiac arrhythmia and to predict preoperative risk factors. And also we evaluated the effectiveness of atrial and ventricular epicardial electrodes which were placed during operation Between March 1990 and August 1990, We had operated on in 211 patients and we studied 201 consecutive patients excluding 10 patients. The study group included 99 males and 102 female patients, ages 1 month to 75 years[Mean$\pm$SD=28.0$\pm$21.7 years]. Postoperatively, all patients were regularly seen by the cardiac surgeon and cardiologist, They had continuous electrocardiographic monitoring for the first 3 days, initially in the intensive care unit and were checked routine electrocardiography on the postoperative 7 days, The postoperative cardiac arrhythmia were analyzed and possible associations of this arrhythmia with various pre, intra, and postoperative factors were studied by univariate and multivariate discriminant analysis, The overall incidence of postoperative cardiac arrhythmia except relative sinus bradycardia was 36.8%;[74/201], The incidence of postoperative cardiac arrhythmia in acyanotic congenital heart disease: 19.4%, cyanotic congenital heart disease: 20.8%, cardiac arrhythmia surgery: 33.3%, acquired valvular heart disease: 60.9% and coronary artery occlusive disease: 38.9%. Both univariate and multivariate studies indicated the pre operative symptom duration[p = 0013], the duration of medication[p=0.003], presence of preoperative arrhythmia[p<0.001] and pre-operative left atrial dimension in echocardiography to be the factor promoting postoperative cardiac arrhythmia. Multivariate discriminant analysis showed that the presence of preoperative cardiac arrhythmia, bypass time and the duration of preoperative symptom duration conveyed considerable risk factor on post-operative arrhythmia. The atrial wire electrodes were used diagnostically in 36 and were used therapeutically in 89 among 201 patients. Atrial pacing were used to treat relative sinus bradycardia, accelerated junctional tachycardia or premature atrial or ventricular contractions in 51 patients. Atrioventricular sequential pacing were used in 16 patients and ventricular pacing were used in 20 patients. Hemodynamics were evaluated in 2 patients of relative sinus bradycardia before and after atrial pacing. The atrial pacing increased the amount of cardiac output to 15% more. Because of their great utility in the diagnosis and treatment of arrhythmias, we conclude that routine placement of atrial and ventricular electrodes at the time of operation is indicated regardless of the nature of the open-heart procedure.