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이승준,신인동,최수창,김용우,이종렬,이득우,Lee, Seung-Jun,Shin, In-Dong,Cha, Sao-Chang,Kim, Yong-Woo,Lee, Jong-Ryul,Lee, Deug-Woo 한국생산제조학회 2010 한국생산제조학회지 Vol.10 No.6
The development of high-speed spindle have been studied extensively for micro machining in advanced industrial countries. The research of miniaturized high-speed air spindle is important part which needs for the micro machining process of high quality. So, This study was to carry out results about design characteristics of miniaturized high-speed air spindle. We had designed 4type turbines and shaft. They were simulated in use the computer simulation programs. We made them as products. They measured RPM (revolutions per minute). As a result of experiments, there was a contrast among 4type Turbines. it reached 384,000rpm in 4.5bar of air pressure. And, We tried to compare the results of measurement whit the results of computer simulation.
해양환경 하에서 Ni-Cr계 자용성 합금 코팅된 ALBC3 합금의 캐비테이션 특성 평가
이승준,김성종,Lee, Seung-Jun,Kim, Seong-Jong 해양환경안전학회 2013 海洋環境安全學會誌 Vol.19 No.5
본 연구에서는 ALBC3 합금에 Ni기 자용성 합금으로 내마모성 및 내캐비테이션 특성을 향상시키기 위하여 용사코팅 후 열처리를 실시하여 캐비테이션 특성을 평가하였다. 본 연구 결과, 자용성 합금 코팅층이 높은 경도를 나타내어 내마모성이 우수할 것으로 판단되나, 다공질의 조직으로 인해 열악한 내캐비테이션 특성을 나타냈다. 따라서 열처리 조건의 최적화가 중요하며, 본 조건에서는 열처리 온도를 높여 자용성 합금 내 B와 Si의 유동성을 증가시킴으로써 기공이나 결함을 제거하여 특성개선 효과를 기대할 수 있을 것으로 판단된다. In this study, cavitation characteristics of a thermal spray coating were evaluated in order to improve durability and cavitation resistance. For a coating material, a Ni-based self-fluxing alloy was thermal-sprayed over a ALBC3 alloy substrate and subsequently modified by heat treatment.The resulted self-fluxing coating layer had relatively high hardness compared to the base material, and thus would be expected to exhibit good durability. However, the cavitation characteristics were deteriorated due to the intrinsic porous structure of the coating. Therefore, it is essential to optimize heat treatment condition during thermal spraying coating process for self-fluxing alloy, and in this research the increase in heat treatment temperature is thought to increase the fluidity of B and Si in the self-fluxing alloy and to remove pores or defects, leading to the characteristics enhancement.
조건부 엔트로피 제한 벡터 양자화를 이용한 영상 부호화
이승준,서용창,이충웅,Lee, Seung-Jun,Seo, Yong-Chang,Lee, Choong-Woong 대한전자공학회 1994 전자공학회논문지-B Vol.b31 No.11
벡터 양자화를 이용하여 영상신호를 압축하는 경우, 원 영상을 복원하기 위하여 복호기쪽에 어야 하는 인덱스들 사이에는 높은 상관성이 존재하며, 이러한 높은 상관성을 인덱스의 부호화에 이용하면 보다 높은 부호화 효율을 얻을 수 있다. 본 논문에서는, 각 인덱스들을 이전 인덱스의 값에 따라 적응적으로 부호화하는 조건부 엔트로피 부호화를 도입하고, 이 경우 벡터 양자기를 최적화하는 방법을 제안한다. 즉, 조건부 엔트로피 부호화를 도입하는 경우 각 입력벡터당 평균 비트수는 조건부 엔트로피에 근접한다는 사실을 유용하여, 조건부 엔트로피를 제한한 상태에서 평균 왜곡을 최소화 하도록 VQ 부호책을 구성함으로써 최적화 과정이 이루어진다. 또한, 이와 같이 각 입력벡터의 양자화 결과가 다음 입력벡터의 인덱스를 부호화하는데 영향을 미치는 경우, 장시간(long term)의 관점에서 최적인 인덱스열을 찾기 위해 우리는 비터비 탐색 방법을 도입한다. 영상 모의 실험을 통해, 제안하는 방법이, 구획간의 상관성을 이용하지 않는 기존의 엔트로피 제한 벡터 양자기에 비해 같은 비트율에서 약 1.0~3.0 dB 높은 PSNR을 나타냄을 알 수 있었다. This paper proposes a new vector quantization scheme which exploits high correlations among indexes in vector quantization. An optimal vector quantizer in the rate-distortion sense can be obtained, if it is designed so that the average distortion can be minimized under the constraint of the conditional entropy of indes, which is usually much smaller than the entropy of index due to the high correlations among indexes of neighboring vectors. The oprimization process is very similar to that in ECVQ(entropy-constrained vector quanization) except that in the proposed scheme the Viterbi algorithm is introduced to find the optimal index sequence. Simulations show that at the same bitrate the proposed method provides higher PSNR by 1.0~3.0 dB than the conventional ECVQ when applied to image coding.
시평탕(柴平湯) 및 시평탕가미방(柴平湯加味方)의 항(抗)알레르기에 관(關)한 실험적(實驗的) 효과(效果)
이승준,이진용,정규만,Lee Seung-Jun,Lee Jin-Yong,Jeong Gyu-Mahn 대한한방소아과학회 1994 대한한방소아과학회지 Vol.8 No.1
Experimental studies were done to research the clinical effects of Sipyungtang and Sipyungtang-gamibang (sipyungtang with Anemarrhenae Rhizoma added) on the Anti-allergic effect. The results obtained as follows; 1. In the effects of Sipyungtang and Sipyungtang-gamibang on vascular permeability responses to intradermal Histamine, Sipyungtang group revealed none significant effect, but Sipyungtang-gamibang group revealed significant effect. 2. In the effects of sipyungtang and Sipyungtang-gamibang on vascular permeability responses to intradermal serotonin, Sipyungtang group revealed none significant effect, but Sipyungtang-gamibang group revealed significant effect. 3. In the 48hrs homologous passive cutaneous anaphylaxis provoked by the IgE-like antibody against egg white albumin, Sipyungtang and Sipyungtang-gamibang groups revealed none significant effect. 4. In the delayed type hypersensitivity responses to Picryl Chloride, Sipyungtang and Sipyungtang-gamibang groups revealed none significant effect. 5. In the delayed type hypersensitivity responses to SRBC, Sipyung-tang and Sipyungtang-gamibang groups revealed significant effect.
상한론의 '기기상충(其氣上衝)'과 '계지탕(桂枝湯)'에 대한 연구
이승준,김영목,Lee, Seung-Jun,Kim, Yeong-Mok 대한한의학방제학회 2012 大韓韓醫學方劑學會誌 Vol.20 No.2
In pathologically analyzing, 'Qi(氣)' is fall downed 'Zheng-Qi(正氣; Base energy of human body)' or 'Wai-Gan-Xie-Qi(外感邪氣; poisoned energy from outside of human body)'. And all extroverted symptoms from this 'Qi(氣)' is 'Shang-Chong(上衝)'. Also this symptom's basic mechanism is deficiency of 'Zhong-yang(中陽; basic active energy acting pivot)' by non-proper 'Xia-fa(下法; treatment way getting out focus to down side)' at early days of 'Tai-Yang-bing (太陽病; Primary stage symptoms when the cold energy of the outside tresspasses the external layer of body)'. And comparing herbs in medicines for treating 'Shang-Chong(上衝)' in Shang han lun with Japanese in Shang-han medical practitioner's view, there is 'Ping-Chong(平衝; Supress out bursting energy)''s effect when use 'Gui-zhi(桂枝; Cinnamomum cassia loureirii zeylanuicum)' for mass dosage. Based on these, 'Qi-Shang-Chong(氣上衝)' means all of the symptom's aspects which called 'Yang(陽)''s aspect that is extrovesity, dynamic and imminent by results of the experiment about Cinnamaldehyde which are the main ingredients of 'Gui-zhi(桂枝; Cinnamomum cassia loureirii zeylanuicum)' and clinical data of 'Gui-zhi-tang(桂枝湯)'.