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Twist Wheel 방식 폐비닐수거기 개발에 관한 연구(Ⅰ)
하유신(Yu-Shin Ha),박규식(Kyu-Sik Park),김진현(Jin-Hyun Kim),최중섭(Jung-Seob Choe),손철민(Chul-Min Son),김태욱(Tae-Wook Kim) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.1
Mulching vinyl is used on field crops to reduce herbicides and this causes multiple effects. The mulching vinyl must be collected for the next crop season, but was left alone due to a shortage of labor. The used mulching vinyl that was left alone acted as one of the main sources of environmental pollution on farms. In order to solve these problems, a self-propelling vinyl remover was developed. The self-propelling vinyl remover consists of a travelling part and rotating of remover wheel. Each output device has a 1.5ps engine and a 2.5ps engine. The vinyl was twisted 17~47㎝/times length. The bobbin’s diameter was 160㎜ and it’s stable travelling speed was 0.5㎧. The revolution of the remover wheel bobbin was 60rpm to maintain the wheel’s linear velocity. As seen at performance test at the field which had 950㎜ ridge intervals and 10a area, the average working speed was 0.56㎧ and the turning time was 15seconds. Therefore, the working performance was 40.1min/10a.
하유리,최면천,조남주,김일,한세원,한미정,하창식,한동희 한국고분자학회 2008 Macromolecular Research Vol.16 No.8
Polyimide (PI) multilayer thin films were prepared by spin-coating from a poly(amic acid) (PAA) and poly(amic acid) ammonium salt (PAAS). PI was prepared from pyromellitic dianhydride (PMDA) and 4,4’-oxydianiline (ODA) PAA. Different compositions of PAAS were prepared by incorporating triethylamine (TEA) into PMDA-ODA PAA in dimethylacetamide. PI multilayer thin films were spin-coated from PMDA-ODA PAA and PAAS. The PAAS comprising cationic and anionic moieties were spherical with a particle size of 20~40 nm. Some particles showed layers with ammonium salts, despite poor ordering. Too much salt obstructed the interaction between the polymer chains and caused phase separation. A small amount of salt did not affect the interactions of the interlayer structure but did interrupt the stacking between chains. Thermogravimetric analysis (TGA) showed that the average decomposition temperature of the thin films was 611 oC. All the films showed almost single-step, thermal decomposition behavior. The nanostructure of the multilayer thin films was confirmed by X-ray reflectivity (XRR). The LF 43 film, which was prepared with a 4:3 molar ratio of PMDA and ODA, was comprised of uniformly spherical PAAS particles that influenced the nanostructure of the interlayer by increasing the interaction forces. This result was supported by the atomic force microscopy (AFM) data. It was concluded that the relationship between the uniformity of the PAAS particle shapes and the interaction between the layers affected the optical and thermal properties of PI layered films.
한우 및 낙농 단지용 소형 TMR 플랜트 모델 개발(II) - 모델의 성능시험 및 경제성분석 -
하유신,홍동혁,박경규 한국농업기계학회 2010 바이오시스템공학 Vol.35 No.2
A Model of small scale total mixed rations(TMR) plant which can be utilized round bales was developed, tested and analyzed in this study. This study consist of two parts. One is development of a small scale TMR plant model which was already reported at the previous paper. This is the second part of the study. For the study, a series of tests of the model plant were performed and its costs was analyzed. Also, the break-even point of the model plant by comparing with market price of commercial TMR feed was determined. Results of the research are summarized as follows ;As the results of mixing test, the average coefficient of variation(CV) value for mixing of the feed was 13.0 % at the gate of the mixer. The production cost was estimated as 8,298 won/head for dairy cattle farm and 2,495 won/head for beef cattle farm, when producing 8 batch a day. Also, it is recommended to utilize the model plant when farm size is over 79 heads for dairy cattle farm and 113 heads for beef cattle farm. As an overall conclusion, the model plant designed for farm size TMR feed mill will be very useful model for both beef cattle and dairy farms in Korea. Also it is expected that the capital investment for the model plant can be recovered with 8 months compare with purchasing commercial TMR feed if the model plant feeds 1,000 beef cattle approximately.
하유리,최면천,김일,하창식,김영규,한미정 한국고분자학회 2010 Macromolecular Research Vol.18 No.1
We report the microstructure and properties of polyimide molecular composite films fabricated from a rigid rod-like polyimide [poly(pyromellitic dianhydride-p-phenylene diamine) (PMDA-PDA PI)] and a flexible coil-like poly(amide-imide) [poly(trimellitic anhydride chloride-4,4'-oxydianiline) (TMAC-ODA PAI)]. The molecular composite films were prepared by the thermal imidization of precursor molecular composite films consisting of soluble precursors of PMDA-PDA PI and TMAC-ODA PAI. The microstructure of the polyimide/poly(amide-imide) molecular composite films was characterized by infrared spectroscopy and X-ray diffraction. The thermal, optical, dielectric, and mechanical properties of the molecular composite films were examined using a thermogravimetric analyzer, differential scanning calorimeter, prism coupler, impedance analyzer, and universal testing machine. The results showed that the molecular composite films exhibited a single glass transition, indicating good compatibility between the two components. However, most of the properties showed a nonlinear trend with the compositions in the presence of a critical point at PMDA-ODA PI/TMAC-ODA PAI = 40/60 (wt/wt).
Angiotensin-Converting Enzyme Inhibitor(ACE Inhibitor)에 의해 유발된 안면부 맥관부종(angioedema) 치험례
하유군,정기용,백종우,김동우,박종형,전찬용,최유경,Hsia, Yu-Chun,Jung, Ki-Yong,Baik, Jong-Woo,Kim, Dong-Woo,Park, Jong-Hyung,Jun, Chan-Yong,Choi, You-Kyung 대한한방내과학회 2007 大韓韓方內科學會誌 Vol.28 No.2
Angioedema is a localized transient swelling of sudden onset that can occur in the face, lips, tongue, hand, feet, respiratory system and gastrointestinal system. Angioedema is classified as allergy, hereditary, idiopathic or induced by medication as like aspirin, nonsteroidal anti-inflammatory agents, opiates, antibiotics, and angiotensin-converting enzyme. Angiotensin-converting enzyme inhibitors are widely prescribed for hypertension and heart failure. This drug is commonly associated with angioedema which may be potentially life threatening. We experienced a case of angioedema induced by ACE inhibitor (angiotensin-converting enzyme inhibitor) in a 74-year-old patient who took ACE inhibitor to control hypertension during hospitalization. We thought the angioedema in the face had relation to myenzhong (面腫, mienjong) in oriental medicine. Weiling-tang (Wiryung-tang) was effective for angioedema in the face. As a result the symptoms disappeared rapidly. After 6 days, the patient's symptoms had notably improved.
급성기 뇌중풍환자의 비만 및 복부비만과의 임상적 제특징 분석
하유군,정기용,고호연,정희,백종우,여현수,고미미,최유경,김동우,한창호,조기호,방옥선,박종형,고성규,전찬용,Hsia, Yu-Chun,Jung, Ki-Yong,Go, Ho-Yeon,Jung, Hee,Baik, Jong-Woo,Yeo, Hyun-Soo,Ko, Mi-Mi,Choi, You-Kyung,Kim, Dong-Woo,Han, Chang-Ho,Cho, Ki- 대한한방내과학회 2008 大韓韓方內科學會誌 Vol.29 No.1
Background and Purpose : This study was to assess characteristics in acute stroke patients according to obesity and abdominal obesity. Methods : From1 Oct. 2005 to 31 Jul. 2007, 629 patients with a stroke were included. Patients were hospitalized within 30 days after the onset of stroke at Kyungwon University Incheon Oriental Hospital, DongGuk University International Hospital and Department of Cardiovascular and Neurologic Disease (Stroke Center), or Kyung Hee University Oriental Hospital. We investigated general characteristics preferences according to general obesity and abdominal obesity. Results : 629 acute stroke patients were included in the final analysis. Male, young age, hypertension, heart disease in the family history, hypertension in the past history, care of invalids or grandchildren and Taeumin in the Sasang constitution were higher among obese patients. Male, transient ischemic attack in the past history, smoker and Soyangin in the Sasangconstitution were higher among patients with abdominal obesity. The incidence of abdominal obesity corresponded to lower education level. Conclusions : In our study, we observed the general disposition of various characteristic distributions according to obesity and abdominal obesity in acute stroke patients.
Fabrication of Remarkably Bright QD Densely-Embedded Silica Nanoparticle
하유나,정흥수,정신영,김형모,김태한,차명근,강은지,Xuan-Hung Pham,정대홍,전봉현 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.1
We developed a synthesis method for silica-coated quantum dot (QD)-densely-embedded silica nanoparticle (Si@D-QD@Si NP) with remarkably brighter fluorescence by increasing the number of QDs on silica NPs. Si@D-QD@Si NPs exhibited a narrow size distribution and a high signal reproducibility. Red, green, and blue Si@D-QD@Si NPs were successfully fabricated and characterized. The Si@D-QD@Si NP carried 2.4 times more QDs than previously reported silica-coated QD-embedded silica NP (Si@QD@Si NP). The quantum yield of Si@D-QD@Si NPs was slightly higher than Si@QD@Si NPs. The red Si@D-QD@Si NPs showed approximately 26.6%, the green Si@D-QD@Si NP 36.2%, and the blue Si@D-QD@Si NP 39.3% higher fluorescence intensity compared to the corresponding Si@QD@Si NPs. This result implied that the particles can be used at bio-field with a higher sensitive detection.
하유군,정기용,고호연,정승민,정희,고미미,강미숙,최유경,김동우,한창호,조기호,박종형,고성규,전찬용,Hsia, Yu-Chun,Jung, Ki-Yong,Go, Ho-Yeon,Jung, Seung-Min,Jung, Hee,Ko, Mi-Mi,Kang, Mi-Suk,Choi, You-Kyung,Kim, Dong-Woo,Han, Chang-Ho,Cho, Ki-Ho,P 대한한방내과학회 2007 大韓韓方內科學會誌 Vol.28 No.1
Background and Purpose : This study was to survey complication according to the TOAST classification and Sasangconstitution in first-ever AICD (acute ischemic cerebrovascular disease) patients. Methods : From 1 Oct. 2005 to 31 Oct. 2006. 97 patients with a first-ever stroke were included in the study. patients were hospitalized within 14 days after the onset of stroke at Kyungwon University Incheon Oriental Hospital. We recorded patient's complications according to the standard operation procedure of 'A stroke study for standardization and science on Korean Medicine' Results : Complications were recorded in 23 cases (24%). The most common complication was upper respiration infection in 11 cases (11%). No statistical significance was shown between complications of AICD and Sasangconstitutions, but complications rate of LAA was higher than SVO in AICD patients (odds ratio 4.17 95% CI 1.127${\sim}$7.307). Conclusions : To acquire more concrete data on this theme. we need further and larger scale research.