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고영일 ( Young-il Ko ),이현수 ( Hyon-soo Lee ),박영재 ( Young-jae Park ),박영배 ( Young-bae Park ) 대한한의진단학회 2006 大韓韓醫診斷學會誌 Vol.10 No.2
Objectives: To review the method, validity and reliability of Impedance Cardiography and to study its oriental medical application. Method: The papers reviewed in this study were searched through internet search engines such as Springer, Science Direct, and China National Knowledge Infrastructure. Conclusion: In this study, the methodological limitations, validity and reliability of impedance cardiography were examined. Impedance Cardiography is recognized as a highly accurate non-invasive tool to assess hemodynamic parameters. The ability of impedance cardio-graphy to assess hemodynamic parameters in non-invasive way is very suitable for researches on the effect of oriental medical therapeutics or the validation of oriental medical diagnostic.
센서 네트워크에서 장애물 극복을 위한 방향기반의 라우팅 기법
고영일(Young Il Ko),박창섭(Chang Sup Park),손인근(In Keun Son),김명호(Myoung Ho Kim) 한국정보과학회 2006 정보과학회논문지 : 정보통신 Vol.33 No.6
Geographic routing protocols are very attractive choice for routing in wireless sensor networks because they have been shown to scale better than other alternatives. Under certain ideal conditions, geographic routing works correctly and efficiently. The most commonly used geographic routing protocols include greedy forwarding coupled with face routing. Existing face routing algorithms use planarization techniques that rely on the unit-graph assumption. In real world, many conditions violate the unit-graph assumption of network connectivity, such as location errors, communication voids and radio irregularity, cause failure in planarization and consequently face routing. In this paper, we propose the direction-based geographic routing, which enables energy efficient routing under realistic conditions without planarization techniques. Our proposed approach is for the case in which many sensors need to collect data and send it to a central node. Simulation results show that the protocol exhibits superior performances in terms of energy consumption, delivery success rate, and outperforms the compared protocols. 센서 네트워크에서는 센서노드들 사이에 다양한 형태의 장애물들이 존재할 수 있다. 이러한 장애물들로 인하여 라우팅 과정에서 해결해야 할 여러 가지 문제점들이 발생하게 된다. 즉, 장애물을 우회하는 과정에서 극복경로가 지나치게 길어질 수 있다. 따라서, 장애물이 많은 환경에서도 에너지 효율적으로 경로를 생성할 수 있는 라우팅 기법이 요구된다. 기존의 위치기반 라우팅 기법은 장애물 극복을 위해 전체 네트워크 그래프를 평면 그래프(planar graph)로 변환하는 과정을 필요로 한다. 이 과정에서 실제 네트워크 토폴로지가 왜곡됨으로 인해 여러 가지 문제점들이 발생할 수 있다. 본 논문에서는 목적지 중심의 극 좌표계를 기반으로 센서의 위치를 결정하고, 플라나 과정 없이 장애물을 적응적으로 극복할 수 있는 방향기반의 라우팅 기법을 제안한다. 또한, 실험을 통하여 제안 방법이 장애물을 회피하는 과정에서 에너지 효율적인 경로를 생성함을 보인다.
호흡 제어에 따른 임피던스 심장도와 지첨용적맥파에 관한 연구
고영일 ( Young-il Ko ),박영배 ( Young-bae Park ),박영재 ( Young-jae Park ),이현수 ( Hyon-soo Lee ) 대한한의진단학회 2007 大韓韓醫診斷學會誌 Vol.11 No.1
Purpose: We performed this study to examine the effect of controlled respiration on cardiovascular system in healthy adult subjects using impedance cardiography and photo-plethysmography. Materials and Methods: This study had performed on 74 subjects, which were healthy men and women without a experience of respiration practice. Using the instruments for impedance cardiography and photoplethysmography, parameters of each subject had been measured after each controlled respirations which were natural respiration, controlled natural respiration (I:E=1.1.6), longer inspiration(I:E=3:3), and longer expiration(I:E=2:4). The measured parameters of impedance cardiography and photoplethysmography were processed statistically by one-way repeated ANOVA. Results: 1. HR and CI of impedance cardiography were decreased significantly during controlled respiration comparing with the result of basal state(the state of enough break). There was no significant difference among the results of controlled respiration. 2. PEP of impedance cardiography had no significant difference among the result of basal state and the results of controlled respiration(p=0.059). 3. VI of impedance cardiography had significant differences among the result of basal state and the results of controlled respiration, and decreased continuously through the controlled respiration. 4. b/a of photoplethysmography had no significant difference among the result of basal state and the results of controlled respiration(p=0.554). 5. c/a of photoplethysmography were decreased significantly during controlled respiration comparing with the result of basal state. There was no significant difference among the results of controlled respiration. 6. d/a of photoplethysmography had significant differences among the results of the controlled respiration decreasing continuously through the controlled respiration and had no significant difference between the result of basal state and the result of natural respiration. 7. AGI of photoplethysmography had significant differences among the result of basal state and the results of the controlled respiration increasing continuously through the controlled respiration. Conclusion: We had examined the effects of controlled respirations on cardiovascular system in multiple points of view. The effects of controlled respirations on cardiovascular system can`t be explained in a simple way, as the cardiovascular system is controlled by many factors. Therefore, more physiological parameters must be measured in the future study on the effect of the controlled respiration on human cardiovascular system.
고영일 ( Young-il Ko ),이현수 ( Hyon-soo Lee ),박영재 ( Yong-jae Park ),박영배 ( Young-bae Park ) 대한한의진단학회 2008 大韓韓醫診斷學會誌 Vol.12 No.1
Object : The purpose of this study is to the review recent 20 years chinese achievements on the use of impedance cardiography for chinese medicine. Methods : From the China Journal Full Text Database we searched papers on the use of impedance cardiography for chinese medicine by the keyword "心阻抗圖". Results : The researches are summarized into 3 parts. (1) the researches on the relationship between the parameters of impedance cardiography and the chinese medical diagnoses; pulse diagnosis and tongue inspection. (2) the researches on the objective assessment using impedance cardiography for the effects of chinese medical therapy. (3) the researches on the objective evaluation index of Heart Deficiency Syndrome using impedance cardiography. Conclusion : The parameters of impedance cardiography has been established for its usefulness in various chinese medical researches.
고영일(Young-Il Go),오성보(Seong-Bo Oh),김일환(Eel-Hwan Kim),김세호(Se-Ho Kim),고봉운(Bong-Woon Ko) 한국조명·전기설비학회 2009 한국조명·전기설비학회 학술대회논문집 Vol.2009 No.5월
보안구역의 외곽울타리지역의 경비체제를 인적경비에서 과학화경비로 전환함에 따라 CCTV 카메라 및 모니터 기능이 보다 향상되고 있는 반면에 이에따른 조명설비의 중요성이 인식되었다. 그러므로 본 논문에서는 보안구역내 과학화된 보안시스템에 적합한 조명개선을 위하여 기존 시설된 고압나트륨과 시범 설치된 LED 광원 및 조명등주의 위치를 변경하면서 조도를 실측하였다. 또한 CCTV 감시 화면의 특성을 고려하여 정확한 물체를 확인 할 수 있는 명암을 유지하기 위한 조명 값을 구하기 위하여 시뮬레이션을 실시하여 조도 개선안을 제시하고자 한다.
마이크로캡슐을 기반으로 하는 미래형 자가치유 복합소재의 최근 연구기술 동향
하유미 ( Yu-mi Ha ),김영오 ( Young-o Kim ),고영일 ( Young-il Ko ),정용채 ( Yong Chae Jung ) 한국공업화학회 2017 공업화학전망 Vol.20 No.1
과학기술의 트렌드는 산업이 점차 고도화 되어감에 따라 다양한 학문과 기술들이 서로 융합되어 새로운 연구분야와 소재를 탄생시키고 있다. 이 중에서 자가치유소재는 그동안 소재의 한계특성을 뛰어넘고 싶은 많은 연구자들에게 좋은 해결책을 제시해준다. 본고에서는 이러한 해결책들 중 마이크로캡슐을 이용한 자가치유소재 분야에 관한 최근 연구기술동향을 소개하고자 한다.