• 대한의용생체공학회:의공학회지
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• 제28권5호
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• pp.676-683
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• 2007

A non-invasive respiratory gated radiotherapy system like those based on external anatomic motion gives better comfortableness to patients than invasive system on treatment. However, higher correlation between the external and internal anatomic motion is required to increase the effectiveness of non-invasive respiratory gated radiotherapy. Both of invasive and non-invasive methods need to track the internal anatomy with the higher precision and rapid response. Especially, the non-invasive method has more difficulty to track the target position successively because of using only image processing. So we developed the system to track the motion for a non-invasive respiratory gated system to accurately find the dynamic position of internal structures such as the diaphragm and tumor. The respiratory organ motion tracking apparatus consists of an image capture board, a fluoroscopy system and a processing computer. After the image board grabs the motion of internal anatomy through the fluoroscopy system, the computer acquires the organ motion tracking data by image processing without any additional physical markers. The patients breathe freely without any forced breath control and coaching, when this experiment was performed. The developed pattern-recognition software could extract the target motion signal in real-time from the acquired fluoroscopic images. The range of mean deviations between the real and acquired target positions was measured for some sample structures in an anatomical model phantom. The mean and max deviation between the real and acquired positions were less than 1mm and 2mm respectively with the standardized movement using a moving stage and an anatomical model phantom. Under the real human body, the mean and maximum distance of the peak to trough was measured 23.5mm and 55.1mm respectively for 13 patients' diaphragm motion. The acquired respiration profile showed that human expiration period was longer than the inspiration period. The above results could be applied to respiratory-gated radiotherapy.

• 전자공학회논문지A
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• 제29A권1호
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• pp.33-40
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• 1992

4인치(100) 실리콘 기판상에 센서용 다이아프램을 제조할 때 생기는 식각 현상들을 관찰하고 분석하였다. 115$^{\circ}C$의 "F etch' 용액을 사용하여 300$\mu$ 이상의 깊은 식각을 행하였을 때 식각 표면에 발생하느 식각 결함은 hillock, 반응 생성물, 그리고 횐색 잔유물로 구분될 수 있었따. 특히 hillock의 경우 식각 표면에 부착된 반응 생성물의 밀도나 크기에 관계하여 |111|면들로 이루어질는 피라밋 구조나 사다리꼴 육면체등의 형태를 취함이 확인되었다. 또한 용해된 실리콘의 국부적인 과잉 포활 발생하는 흰색 잔유물의 IR 흡수 스펙트럼을 조사한 결과, Si-N-O 성분에 미량의 h와 C가 포함된 것임을 알 수 있었다. 아울러 식각면을 식각용액에 대해 아래쪽, 위쪽, 그리고 측면을 향하도록 놓았을때 식각 결함의 존재 확률과 분포 그리고 식각율의 분포를 비교한 결과 식각율의 균일성면에서는 하측방향의 자세가, 식각결함의 제거에 있어서는 측면방향의 자세가, 식각결함의 제거에 있어서는 측면방향의 자세가 유리하게 나타났으며 이를 반응조내의 흐름 패턴을 이용하여 해석하였다.

• 전기학회논문지
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• 제57권1호
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• pp.142-147
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• 2008

Abdominal circumference changes due to breathing by the respiratory muscle activity such as diaphragm, which would partially represent the lung volume variation. The present study introduced conductive rubber molded in a cord shape incorporated with a patient's pants. The conductive rubber cord operated as a displacement transducer to measure the lung or abdominal volume changes. Signal extraction circuitry was developed to obtain the volume and its derivative(or the flow) signals followed by wireless transmission based on the Zigbee communication protocol in a size of $65mm{\times}105mm$ easily put in pocket. Breathing frequency was accurately evaluated and breath pattern analysis seemed feasible, since respiratory behaviours such as maximal inspiration and cough were well identified. Remote wireless receiver module also enabled to monitor both volume and flow signals during resting breathing on a PC terminal.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2004년도 가을 학술발표회 논문집
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• pp.195-202
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• 2004

After the 1990's, Guss asphalt has chosen in Korea for using in pavement of a steel deck bridge because of it's distinguish ability about water proof and so on. But on the other hand it may cause server stress and displacement on the bridge as it is treated using very high temperature ranging from 220℃ to 260℃. Therefore it is critical to estimate the thermal effect of Guss asphalt on the steel deck bridge before the width and pattern of the unit portion are decided to minimize impact. In this study, a serious of numerical tests of the some steel box bridges were idealized were conducted to verify the feasibility of numerical value analysis. The parametric study was performed to present design proposal about the Box section dimensions and the diaphragm spacing.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 추계학술대회 논문집 학회본부
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• pp.342-344
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• 1995

Using piezoresistive effects of single-crystal and poly-crystalline silicon, pressure sensors of the same pattern were fabricated for comparison of temperature characteristics. Optimum size and aspect ratio of rectangular sensor diaphragm were calculated by FEM. For polsilicon pressure sensor, polysilicon resistors of Wheatstone bridge were deposited by LPCVD to be used in a wide' temperature range. Polysilicon pressure sensors showed more stable temperature characteristics than single-crysta1 silicon in the range of $-20\sim125[^{\circ}C]$. To get low TCO (Temperature Coefficient of Offset), below $\pm$3 [${\mu}V/V/^{\circ}C$], it is needed for each TCR of piezoresistors to have a deviation within $\pm25[ppm/^{\circ}C]$ less than $\pm500[ppm/^{\circ}C]$ of resistors for polysilicon pressure sensor can result in low TCS(Temperature Coefficient of Sensitivity) of -0.1[%FS/$^{\circ}C$].

• 한국임상수의학회지
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• 제13권1호
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• pp.87-92
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• 1996

A hemangiosarcoma in a 30 kg, 6-year-old German Shepherd dog showing signs of abdominal distension, anorexia and depression was diagnosed with clinicopathologic examination, abdominal radiographs and ultrasonographic assessmint. In abdominal radiographs, overall abdominal distension was seen. Stomach and some parts of small intestines were deviated caudo-ventrally by enlarged liver. The splenomegaly was also identified and descending colon was dislocated laterally by splenic mass. In ultrasonographic findings, abdominal fluid was identified. Hepatomegaly was seen and it was consisted of multiple, anechoic cysts. The spleen was enlarged and a large round mass with mixed echo pattern at the mid to tail portion of spleen was identified. Grossly, at necropsy, multi-sized cysts in which contained blood and fibrpus materials and some blood were seen in the cross section and it showed hard consistency. Also, lots of small red tumor nodules were dispersed on the serosal surface of the bladder, omentum, mesentery, diaphragm and peritoneum. In abdominal paracentesis, fluid having almost the same properties as circulating blood was identified. The hemoperitoneum was thought to be resulted from the bleeding into peritoneum owing to the rupture of cystic lesions located on the superficial liver area.

• 한국임상수의학회지
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• 제21권1호
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• pp.45-48
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• 2004

5년령의 암컷 히말라얀 고양이가 복막심낭횡격막 허니아가 의심되어서 건국대학교 수의과대학 부속 동물병원에 내원하였다. 일련의 검사를 실시한 후 환자는 복막심낭횡격막 허니아와 간기능 부전이 확진되었다. 그 후 한 달간의 약물치료에도 불구하고, 혈청화학검사에서 간효소 (aspartate transferase, alanine transferase, gamma-glutamyl transferase) 수치는 정상범위로 내려 가지 않았다. 이 환자는 수술 중에 간 일부가 횡격막에 유착되어서 괴사가 일어난 것이 발견되었고, 유착되고 괴사된 간 조직은 횡격막에서 조심스럽게 분리하여 절제하였다. 횡격막은 괴사된 부분을 잘 정리하고 난 뒤에 손상된 횡격막 부분을 simple continuous suture pattern으로 봉합하였다. 수술 후 한 달 뒤 환축은 정상적인 상태를 보였고 다른 복합증 없이 회복되었다. 그리고 혈청화학 수치 중 간효소 수치도 정상 범위로 떨어졌다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권2호
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• pp.871-888
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• 2020

With the development of display engineering and technology, the screen and sound quality of information devices such as TVs are improving. The screen used LEDs via LCD and PDP and a large flat panel in the early CRT to create super-high resolution. The sound is improved by directly vibrating a thin and simple panel, such as an OLED. In our previous study, the exciter speaker was attached to the rear of the OLED panel to be used as the diaphragm of the speaker, and the sound quality was as good as that of the TV using the existing dynamic speaker. This method supplied the viewer with the direct sound coming from the panel, delivering clear sound, and the sound and image came from the same location, thus giving the viewer high immersion and maximizing the effect of information transfer. OLED exciter speakers, however, have a special directivity, which tends to slightly attenuate the tone at the very center of the screen. This study improves the sound quality by improving the structure of the exciter speaker and the radiated sound of the flat panel display. A 2-in-1 Exciter is made into a single core to improve the speaker's radiation pattern.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 춘계학술대회 논문집 유기절연재료 방전 플라즈마연구회
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• pp.108-111
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• 2003

The main objective of this paper is to module design and pressure relief test a new type of polymer gapless surge arrester for power distribution line. Metal oxide surge arrester for most electric power system applications, power distribution line and electric train are now being used extensively to protect overvoltage due to lightning. Surge arresters with porcelain housing must not have explosive breakage of the housing to minimize damage to other equipment when subjected to internal high short circuit current. When breakdown of gapless elements in a surge arrester occurs due to flashover, fault short current flows through the arrester and internal pressure of the arrester rises. The pressure rise can usually be limited by fitting a pressure relief diaphragm and transferring the arc from the inside to the outside of the housing. However, there is possibility of porcelain fragmentation caused by the thermal shock, pressure rise, etc. Non-fragmenting of the housing is the most desired way to prevent damage to other equipment. The pressure change which is occurred by flashover become discharge energy. This discharge energy raises to damage arrester housing and arrester housing is dispersed as small fragment. Therefore, the pressure relief design is requested to obstruct housing dispersion.

• 대한한의학원전학회지
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• 제25권2호
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• pp.1-13
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• 2012

Objective : Zhang, Zhongjing(張仲景)'s Sanghanlun(傷寒論) is based on Six-channels system(六經) to classified a disease. But the notion of Six-channels system seems to be a very various angles. For example, Meridian and collateral theory(經絡說), Viscera and Bowels theory(臟腑說), Grade theory(段階說), Surface theory(地面說), Symptoms theory(症候群說), Six-disease theory(六病說), Eight principle pattern theory(八綱說) and all the rest of it. Above all things Meridian and collateral theory was very frequently quoted to explain the Six-channels system(六經). But it's true notion is not restrict to a meridian vessel(經脈). Method : I will try to describe the Sanghanlun's Greater yang disease(太陽病) through the Ke-qin(柯琴)'s Taiyangbingjie(太陽病解), and I would like to point out that the existing perception that Greater yang(太陽) is connected with Bladder meridian(足太陽膀胱經) is wrong. Result : Ke-qin's Taiyangbingjie explained the greater yang disease was connected with Heart(yang within yang), which was located in the top half and the outer layer of the body. In addition to the presence of the diaphragm or lungs are involved with. Conclusion : Practical meaning of greater yang disease is not connect with Bladder meridian, but it is related to the Heart and Lung for maintain the Nutrient and defense circulation (營衛循環).