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Generic BOM에서의 미입력 파라미터에 관한 연구
김훈태,이영복 대진대학교 생산기술연구소 2000 생산기술연구소 논문집 Vol.3 No.-
The adaptation of the range of products within an enterprises to the today customers demands results in an exploding number of different variant parts and variant bills of material. The mentioned problem can be solved from representing one general BOM for all product variants. That is, Generic BOM includes explaining variants of components. Each variant is represented as a pair of parameter and value. When there are unknown parameter values, this paper explains the methodology for mentioned problem, describes problems, types and specifications owing to existence of unknown parameters. If one more unknown parameter values are exited, determining handling orders of unknown parameters is cause of a different result BOM and constraints to still unknown parameter values, So this paper represents a method for handling order of unknown parameter values. The method is composed of two steps. First step is use of inclusion rule, and second step is exclusion rule. The final specification is the result of the decision of BOM administrator. This paper is expected to reduce laborious work of BOM administrator 주요기술용어 : Generic BOM, unknown parameter value(미입력 파라미터), rule(규칙), specification(명세)
Acute Myocardial Infarction with Simultaneous Thrombosis of Multiple Coronary Arteries
Tae Hoon Yim,Jee Seon Kim,Byung Chul Kim,Hak Ro Kim,Tae Jin Kim,Young Bok Kim 순천향대학교 순천향의학연구소 2015 Journal of Soonchunhyang Medical Science Vol.21 No.1
Simultaneous thrombosis of multiple coronary arteries in acute myocardial infarction is very rare in clinical settings. Its mechanism is not yet clear, but patients displaying multivessel simultaneous thrombosis tend to have poor clinical outcomes. Hence, it is important to recognize this condition and provide timely and proper management. We report a case of simultaneous thrombosis involving multiple coronary arteries in a patient with ST-segment elevation myocardial infarction.
복태훈(Tae-Hoon Bok),콩치(Qi Kong),남권호(Kweon-Ho Nam),최재철(Jay Chol Choi),팽동국(Dong-Guk Paeng) 한국비파괴검사학회 2012 한국비파괴검사학회지 Vol.32 No.5
본 논문에서는, 두 나이군의 인체 요골동맥과 경동맥에서 초음파 혈액 영상을 측정하여 혈액에코박동지수를 분석했고, 또한 뇌졸중 환자와 대조군의 요골동맥과 경동맥에서 초음파 혈액 영상을 측정하여 혈액에코박동지수를 비교했다. 요골동맥의 혈액에코박동지수는 젊은 세대와 나이 많은 세대가 각각 0.13±0.11, 0.16±0.03로 유사한 반면, 경동맥에서는 각각 0.70±0.21, 0.32±0.01로 젊은 세대에서 더 높게 나타났고, 피험자 별로 더 높은 분산을 보였다. 뇌졸중 환자와 대조군의 혈액에코박동지수는 요골동맥(0.22±0.02, 0.16±0.03)과 경동맥(0.35±0.02, 0.32±0.01) 모두 환자군에서 더 높게 나타났다. 이와 유사하게, 섬유소원 농도 역시 요골동맥과 경동맥 모두 대조군(264±38, 257±43 mg/dl)보다 환자군(336±61, 340±126 mg/dl)에서 더 높게 나타났다. 본 연구의 결과는 향후 적혈구 응집과 뇌졸중의 상관성에 대한 초음파 연구의 가능성을 제시하고 있으며, 적혈구 응집의 생체 내 측정은 임상학적으로 유용하게 활용될 수 있을 것으로 기대된다. In the present paper, the ultrasound blood images were measured at both the human radial artery(RA) and common carotid artery(CCA), depending on the age, and the pulsatility index of blood echogenicity(PIBE) was analyzed. In addition, the ultrasound blood images were measured at both RA and CCA of both the stroke patients and the control group, and PIBE was compared. PIBE of RA for the young group was similar with that for the old group (0.13±0.11 and 0.16±0.03). PIBE of CCA for the young group, however, was larger than that for the old group (0.70±0.21 and 0.32±0.01), and was more variable depending on the subject. Similarly, the fibrinogen concentrations of the patients (336±61 and 340±126 mg/dl) were more than that of the control group (264±38 and 257±43 mg/dl), for both RA and CCA. The results indicate the possibility of the ultrasonic test on the correlation between erythrocyte aggregation and stroke, and it is expected that the in-vivo EA measurement would be clinically useful.
복태훈(Tae-Hoon Bok),김주호(Juho Kim),이종현(Chong-Hyun Lee),배진호(Jinho Bae),팽동국(Dong-Guk Paeng),방익찬(Ig Chan Pang),이종길(Jongkil Lee) 大韓電子工學會 2011 電子工學會論文誌-TC (Telecommunications) Vol.48 No.1
해양에서의 음속은 수온, 염분, 압력에 의한 실험식으로 계산되며 해양에서의 평균 염분은 약 34 psu(practical salinity unit)로 수심이나 수평 거리에 따른 변화가 대부분 수 psu 이하이기 때문에 음속에 크게 영향을 미치지 못한다. 그러나 최근 여름철에 중국 양쯔강 범람에 의해서 24 psu 정도의 저염수가 제주 서부 해역으로 유입되는 사례가 발생하고 있으며 이 저염수는 음속에 영향을 미친다. 본 논문에서는 이러한 환경 변화가 수중통신에 미치는 영향을 분석하였다. 즉, 저염수로 인한 음속구조의 변화를 계산하였고, 저염수층 내에서 송수신 수심과 전달거리를 바꿔가며 음파 전달 경로를 모의하여 통신 채널을 추정하였으며, BPSK(Binary phase shift key) 변조방식을 이용하여 비트 오류율을 계산하였다. 동일한 실험 조건하에 저염수가 없는경우의 성능을 비교하여, 저염수가 통신 성능에 어떠한 영향을 미치는가에 대해 분석하였다. 저염수는 수심 약 20 m까지의 표층부에서 음속의 기울기를 양의 기울기로 변화시켜 음파 채널을 형성하였고, 표층부에서 대부분의 송수신 신호의 비트 오류율을 감소시키는 경향을 확인하였다. 본 논문의 저염수에 의한 수중 통신 성능에 미치는 영향을 분석한 결과는 정확한 해양 통신 및 탐지 성능분석을 하기 위해서는 해양환경의 변화를 고려하는 것이 매우 중요하다는 것을 시사한다. The sound speed of seawater can be calculated by the empirical formula as a function of temperature, salinity and pressure. It is little affected by salinity because the average salinity is 34 psu and varies within a few psu seasonally and spatially in the ocean. Recently, low-salinity water of 24 psu flows into the western sea area of Jeju Island due to the flood of the Yangtze River in China during summer, affecting sound speed profile. In this paper, it was analyzed how environmental changes affected to the underwater communication - the sound speed of low-salinity water was calculated, and the communication channel was estimated by the simulated acoustic rays while the transmitting and receiving depth and the range were varied with and without the low-salinity layer. And The BER (Bit error rate) was calculated by BPSK(Binary phase shift key) modulation and the effects of the low-salinity water on the BER was investigated. The sound speed profile was changed to have positive slope by the low-salinity layer at the sub-surface up to 20 m of depth, forming acoustic wave propagation channel at the sub-surface resulting in the decrease of most of the BER. Consequently, this paper suggests that it is important to consider changes of the ocean environment for correctly analyzing the underwater communication and the detection capability.
고압증기멸균처리가 치과용 지르코니아 세라믹의 저온열화에 주는 영향
이태훈(Tae-Hoon Lee),이상혁(Sang-Hyeok Lee),최재윤(Jae-Yoon Choi),허수복(Soo-Bok Her),안진수(Jin-Soo Ahn),이상훈(Sang-Hoon Rhee),양형철(Hyeong-Cheol Yang),임범순(Bum-Soon Lim) 대한치과재료학회 2010 대한치과재료학회지 Vol.37 No.2
The aim of this study was to evaluate the effect of autoclave treatments on the phase transformation of dental zirconia ceramics, Four commercially available tetragonal zirconia polycrystals (Cercon Base, CRB; Lava, LAV; ZioCera, ZOC; Rainbow, RAB) and one zirconia/alumina composite (ZirAce, ZRA) were tested, Disk type (10×1 ㎜) of specimens were prepared. For grain size estimations, specimens which were thermally etched at 1,500℃ for 1h, were analyzed with SEM. Specimens were autoclave treated at 130℃ for 1, 3, 5, 10, and 15hrs, The phases of specimens were identified by x-ray diffractometer before and after autoclave treatment, and the relative amount of monoclinic phase was calculated, The average grain sizes were approximately 0,43 ㎛ for CRB and ZOC, more than 0.68 ㎛ for LAV and RAB, about 5 ㎛ for ZRA. There were no significant differences in the average grain sizes before and after autoclave treatment for 15hrs. CRB, ZOC and ZRA specimens showed little phase transformation after autoclave treatment for 15hrs (<9%), LAV and RAB, however, showed remarkable phase transformation after autoclave treatment for 5hrs (>20%) and severe phase transformation after autoclave treatment for 10hrs (50%, 44%, respectively). Although LAV and RAB groups showed high monoclinic fraction by autoclave treatments, they were reverse phase transformed by annealing treatment at 1,200℃ for 2 hrs.
Impact Force Minimization Algorithm for Collaborative Robots Using Impact Force Prediction Model
Tae-Jung Kim,Ji-Hoon Kim,Kuk-Hyun Ahn,Jae-Bok Song 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
Recently, the demand for collaborative robots is increasing in the industrial field. However, as the collaborative robots share the same workspace with human workers, there is a high possibility of collision between the robot and the worker. A possible method to ensure the safety of a human worker is to restrict the impact force that the robot exerts on the worker during a collision. That is, if the impact force can be predicted, the robot motion that causes excessive impact force can be detected and handled properly before the actual robot motion. To this end, an algorithm for predicting the impact force generated by a collision is proposed, and a method for ensuring the human safety, by modifying the trajectory of the robot when the excessive impact is predicted with current motion, is investigated. To establish the impact force prediction model, collision experiments were performed with a 6-DOF collaborative robot and a dummy. Moreover, an algorithm for minimizing the impact force, by reducing the end-effector velocity of the robot when excessive impact is predicted from the established model, is proposed to ensure the human safety. The performance of the algorithm was verified through various experiments.