• 대한공업교육학회지
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• v.34 no.2
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• pp.331-345
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• 2009

In this research Sagnac interferometer three different types of mandrel are suggested and this fiber optic sensor is using in monitoring of electric transformer. Vibration characteristics of those mandrels were analyzed and finally more sensitivity mandrel are suggested. Three different mandrels using in fiber optic sensor are hollow cylinder with outer bump, pure hollow cylinder, hollow cylinder with inner bump. Natural frequencies and mode shapes are investigated using finite element method. Mode shape are considered at the frequency range from 2 kHz to 20 kHz. Fundamental dimensions of the hollow cylinder type's mandrel are 30 mm in outer diameter, 50 mm in length, 1 mm in cylinder thickness, $2mm{\times}2mm$ in bump size. Based on the finite element results, when the outer acoustic frequency is near 11 kHz outer bump type and hollow cylinder can get higher sensitivity. Near 17 kHz outer bump and inner bump mandrel can get higher sensitivity. Near 20 kHz hollow cylinder and inner bump mandrel is useful. This results can be applied to design of fiber optic sensor using in monitoring the electrical transformer. Several MHz of outer acoustic frequency can be easily detected using more sensitive mandrel in pursuing expand this technique.

• Clean Technology
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• v.26 no.1
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• pp.1-6
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• 2020

Rapid expansion of supercritical solution (RESS) process was used to make molsidomine (MOL) loaded peracetyl-β-cyclodextrin (PAc-β-CD) nanoparticles, which were collected into the air. The effect of the concentration of the drug PAc-β-CD (0.5 and 1 wt%), extraction temperature (45 ~ 60 ℃), nozzle length (5 ~ 20 mm) and internal diameter (ID) (50 ~ 150 μm) of a capillary, and spray distance on the particle size and morphology of the resulting particles were investigated. The interaction of a drug and PAc-β-CD was confirmed by ¹H-NMR spectroscopy while the particle size was measured by means of a scanning electron microscope. It was found that increasing the temperature from 45 ℃ to 60 ℃ and decreasing the nozzle diameter from 150 μm to 50 μm had an increasing effect on the average particle size, while increasing the spray distance led to a decrease in the average particle size at a constant pressure of 34.5 MPa and temperature of 45 ℃. With 0.5 wt% of PAc-β-CD, the capillary nozzle of short length (5 mm) and small ID (50 μm) gave the smallest size (165 nm). The obtained nanoparticles showed increased dispersity and solubility in oil. The oil suspension of the inclusion complex showed increased sustainability, which can increase the in-vitro controlled release time of the drug.

• Journal of Korean Medical classics
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• v.19 no.2 s.33
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• pp.46-52
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• 2006

${\ulcorner}$황제내경(黃帝內經)${\lrcorner}$ 내함한의학이론(內含韓醫學理論) 기중삼응삼양적내용비상난(其中三陰三陽的內容非常難) 기원인사(其原因是)${\ulcorner}$황제내경(黃帝內經)${\lrcorner}$ 중삼음삼양적내용비상복집(中三陰三陽的內容非常複雜), 특별시삼음삼양적시간배속매편화일양(特別是三陰三陽的時間配屬每篇不日樣) 본론문통과관우(本論文通過關于子) ${\ulcorner}$황제내경(黃帝內經)${\lrcorner}$ 중삼음삼양적시간배속진행연구(中三陰三陽的時間配屬進行硏究), 득출여하결론(得出如下結論), 운기지주기순서춰시오행(목화토금수)순서(運氣之主氣順序就是五行(木火土金水)順序), 저설명주기변화주요근거형지변화(這說明主氣變化主要根據形之變化), 운기지객기순서취시기지대(運氣之客氣順序就是氣之大小)(일양(一陽)${\longrightarrow}$이양(二陽)${\longrightarrow}$삼양(三陽)${\longrightarrow}$일음(一陰)${\longrightarrow}$이음(二陰)${\longrightarrow}$삼음(三陰))${\longrightarrow}$, 저설명객기변화주요근거기지변화(這說明客氣變化主要根據氣之變化) ${\ulcorner}$소문맥해(素問脈解)${\lrcorner}$ 적삼음삼양월별배속시음관(11월:태음)(的三陰三陽月別配屬是陰關(11月:太陰)${\longrightarrow}$양관(1월:태양)(陽關(1月:太陽)${\longrightarrow}$음합(3월:궐음)(陰闔(3月:厥廠)${\longrightarrow}$양합(5월:양명)(陽闔(5월:陽明))${\longrightarrow}$음추(7월:소음)(陰樞(7月:少陰)${\longrightarrow}$양추(9월:소양)(陽樞(9月少陽). 태양소음시음양세력적기초(太陽少陰是陰陽勢力的基礎), 소이상위표리(所以相爲表裏). 소양소음시음양세력적중간(少陽少陰是陰陽勢力的中間), 소이사위표리(所以杞爲表裏) 태음궐음시음양세력적전성기(太陰歐陰是陰陽勢力的全盛期), 소이상위표리(所以相爲表裏) 차료리적의사반영경락류주(此表養的意思反映經絡流注). 태음양명경류주신체전면(太陰陽明經流注身體前面), 태양소음경류주신체후면( 太陽少陰經流注身體後面 ), 소양궐음경류주신체측면(少陽厥陰經流注身體側面). ${\ulcorner}$령추경맥(靈樞經脈)${\lrcorner}$적12경맥류주순서시태음양면경(的12經脈流注順序是太陰陽明經)${\longrightarrow}$소음태양경(少陰太陽經)${\longrightarrow}$궐음소양경적표리경락위주(厥陰少陽經的表裏經絡爲主). 수선매기류주태음양명경적이유(首先脈氣流主太陰陽明經的理由), 취시후천수곡정미화호흡대기결합이형성경맥지기(就是後天水穀精微和呼吸大氣結合而形成經服之氣). 지후맥기류주소음태양경(之後脈氣流注少陰太陽經), 설명순행태음양명경적후천영양물질전입한열경락이위신(說明盾行太陰陽陽明經的後天營養物質轉入寒熱經絡而爲寫薪), 기차맥기순해궐음소양경적(其次脈氣盾行厥陰少陽經的), 인위한열경락지화기피궐음소양경지풍기조절이후조절조습경락(因爲寒熱經絡之火氣被厥陰少陽經之風氣調節而後調節操濕經絡), 비여작반시(比如作飯時), 화기취시소음태양경(火氣就是少陰太陽經), 풍기취시궐음소양경(風氣就是厥陰少陽經), 정내지반취시태음양명경.(鼎內之飯就是太陰陽明經). ${\ulcorner}$령추음양계일월(靈樞陰陽緊日月)${\lrcorner}$ 적삼음삼양월별배속주요시추관합합관추순서(的三陰三陽月別配屬主要是樞關闔闔關樞順序). 저양배서적원인시개문화관문과정(這樣排序的原因是開門和關門過程). 재춘하(在春夏), 양경락지맥기여개문관문과정(陽經絡之脈氣如開門關門過程), 수착추관합합관추순서순행(隨看樞關闔闔關樞順序盾行), 재추동(在秋冬), 음경락지맥기여개문폐문과정(陰經絡之脈氣如開門閉門過程), 수착추관합합관추순행(隨看樞關闔闔關樞盾行).

• Radiation Oncology Journal
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• v.20 no.4
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• pp.391-395
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• 2002

Purpose : To confirm the accuracy of the radiation dose at the isocenter by the standard linear accelerator-based stereotactic radiosurgery technique which was developed at Seoul National University Hospital. Materials and Methods : Radiation dosimetry was undertaken during standard 5-arc radiosurgery using 6 MV X-ray beam from CL2100C linac. The treatment head was attached with circular tertiary collimators of 10 and 20 mm diameter. We measured the absorbed dose at the isocenter of a multi-purpose phantom using two kinds of detector : a 0.125 co ionization chamber and a silicon diode detector. Results : The dose differences at each arc plane between the planned dose and the measured dose at the isocenter raged from $-0.73\%\;to\;-2.69\%$ with the 0.125 cc ion chamber, and from $-1.29\%\;to\;-2.91\%$ with the diode detector during radiosurgery with the tertiary collimator of 20 mm diameter. Those with the 10-mm tertiary collimator ranged from $-2.39\%\;to\;-4.25\%$ with the diode. Conclusion : The dose accuracy at the isocenter was ${\pm}3\%$. Therefore, further efforts such ws modification in processing of the archived image through DICOM3.0 format are required to lessen the dose difference.

• Clean Technology
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• v.13 no.2
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• pp.151-158
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• 2007

An experimental study to investigate the condensing heat transfer characteristics of small diameter horizontal double pipe heat exchangers with R-22 and R-410A was performed. Experimental facility was constructed to calculate and observe HTC(heat transfer coefficients), flow patterns and pressure drop. The main components include a liquid pump, an evaporator, a condenser(test section), a sight-glass, pressure taps and measurement apparatus. Two pipes of different diameters are tested; One 5.35 mm ID 0.5 mm thick, the other 3.36 mm ID 0.7 mm thick. The mass flow rate ranged from 200 to $500\;ks/m^2{\cdot}s$ and heating capacity were form 1.0 to 2.4 kW. The flow patterns of R-22 and R-410A were observed with a high speed camera through the sight-glass. The tests revealed that HTC of R-410A was higher than that of R-22 by maximum 5%. Annular pattern was observed for the most cases but stratified flow was also detected when x<0.2. The pressure drop in 3.36 mm ID pipe was higher than that of 5.35 mm by $30{\sim}50%$. Comparing with previous correlations such as Shah, Fujii and Soliman's, Fujii' showed the best good agreement with my data with a maximum deviation of 40%.

• The Journal of Korean Philosophical History
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• no.27
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• pp.63-84
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• 2009

I analyzed about the Ruyi(儒醫)'s mind on this article. Ruyi led and Nei-Jing (內經)'s Xin(心)-Shen(神)-Qingzhi(情志) it developed a medical theory. Qingzhi comes true confucianism aims became the good tool. Junhuo(君火)-Xianghuo(相火) for them to apply medically. Junhuo-Xianghuo is a possibility of seeking a ground from Nei-Jing. Junhuo governs all body and Xianghuo takes charge of the role which raises the body. It is to divide huo(火)with relationship of the king and the liege man. After Yuan-dynasty(元代) Ruyi medical sciences grasped Junhuo-Xianghuo with confucianism structures. The representative scholar is Zhu zhen-heng(朱震亨). I analyzed Zhu's Junhuo-Xianghuo. Xin-huo rules over the body. For expression of active Chi, it set the dual structure-'Junhuo-Xianghuo'. And it divided Junhuo from desire and sentiment. And Zhu zhen-heng attempted Taoism and medical science and Confucianism from the process under integrating. And analyzed Junhuo-Xianghuo Confucianism meaning. With Junhuo-Xianghuo and Confucianism described a relationship in the Zhu zhen-heng's theory. Finally view of Ruyi, medical science is the method of confucianism aims comes true.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 1994.04a
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• pp.16-22
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• 1994

2.75인치 MK4/40 및 MK66 추진기관용 연소관의 국산화 개발을 목적으로 가공 열처리와 유동성형 공정을 조합한 열가공 유동성형 공정을 적용하여 치수제어시험을 하고 개발품과 수입 연소관을 비교하여 물성 및 구조시험을 실시하여 그 결과를 비교 분석하였다. 개발된 연소관은 수입연소관에 비하여 제작공정이 단축되었고, 열가공 유동성형 공정보다 치수제어에 유리하며, 내경 및 두께 규격을 만족하였다. 또한 물성 및 구조시험 결과 수입 연소관에 비하여 우수한 성질을 나타내었다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 1997.04a
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• pp.133-143
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• 1997

In this paper, some of the critical factors in Necking-In process are investigated using a numerical analysis. The optimal processing parameters are established and applied to the actual processes. FEM analysis is carried out based on elastic-plastic work hardening model using ABAQUS/Standard. The results obtained from the commercially available code ABAQUS/Standard are compared with the experimental data and shows a good agreement with experimental data. The purpose of this paper is to search for the relations among the roller angle, feed length, and working force. Stress, strain distribution, displacement and increase in the length of the workpiece are also investigated.

• The Korean Journal of Applied Statistics
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• v.4 no.2
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• pp.129-135
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• 1991

A few simple methods to find $L_1$-unbiased estimators for location and scale parameters are summarized and examples utilizing diffusivity, a natural measure of dispersion for $L_1$-unbiased estimators, are given.

• The Korean Journal of Applied Statistics
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• v.11 no.1
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• pp.41-51
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• 1998

Effective September, 1997, papers submitted for publication to the Korean Journal of Applied Statistics should be prepared by Hangul-LATEX. In this article we explain how to utilize Hangul LATEX and an accompanying style file KJAS.STY.