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Ke-Hwa Lee,Ming-Yu Zhang,Shih-Chih Chen 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
Up to today, the third generation (3G) mobil services don’t perform as well as expectation than its business forecast a decade ago. Limited handset capability and availability are the one of roof causes to put the blame on operators’ optimistic 3G business model and overlook to subscriber behavioral intentions in various personal concerns. Secured handset enabler (SHE) comprises a series of remote software-controlled mechanism to protect the personal sensitive data and messages that stored in the Smartphone or PDA when the mobile device is mis-placed, lost, or stolen. This study discusses the possible alignment in innovating 3G value-added services (VAS) foundation toward understanding subscriber behavioral intentions and risk assessment. In the proposed modelling elements, perceived usefulness, perceived ease-of-use, subjective norms, and perceived behavioral, control directly influence the behavioral intention through mediation of attitude. The C-TAM-TPB model was utilized to examine those collected data from 233 interviewers in their perceptions of SHE application. Overall, the results revealed that the effect of satisfaction was significant importance, but those usefulness, subjective norms, and perceived behavioral control did not influence directly an individual’s continuance intentions. Moreover, perceived usefulness and perceived ease-of-use had influence indirectly the continuance intentions through mediation of satisfaction. The implications of this study were also discussed in this paper.
이계호,박관화,오병하,홍승서 한국농화학회 1984 Applied Biological Chemistry (Appl Biol Chem) Vol.27 No.3
Ethanol fermentation of chemically gelatinized starch and uncooked raw starch was nested with various starchy materials. Starches were gelatinized by 5.4% NaOH and neutralized by sulfuric acid. The patterns of CO₂ evolving and the ethanol yield for the chemically gelatinized starch resemble those obtained with thermally gelatinized starch. The alcoholic fermentation of raw starch was carried out by the simultanous saccharification-fermentation using a commercial glucoamylase and yeast. Ethanol yield from uncooked rice starch fermentation was highly comparable to that from cooked one. CO₂ evolving rates of the uncooked starches of corn, barley, tapioca and sweet potato were lower than those of the cooked starches. However, the final ethanol yields were similar or slightly lower, depending on the types of starch.
안기주(Ke-Ju An),이병화(Byoung-Hwa Lee),김상인(Sang-In Kim),김만철(Man-Cheol Kim),김승모(Seung-Mo Kim),전충환(Chung-Hwan Jeon) 대한기계학회 2013 大韓機械學會論文集B Vol.37 No.4
4 가지 탄종(Gunvor, Glencore, Noble, ECM)의 촤 산화반응 특성을 900℃에서 1300℃까지의 노내온도와 대기압 조건에서 DTF(drop tube furnace)를 이용하여 실험하였다. 촤 반응률은 FT-IR 장비로 측정한 CO, CO₂ 농도와 이색온도계로 측정한 입자온도를 통해 계산되었고 고회분탄의 활성화에너지(E)와 preexponential 상수(A)는 아레니우스 방정식을 기초로 계산되었다. 실험 결과는 석탄의 회분 함량이 늘어남에 따라, 입자온도와 면적반응성이 감소하였다. 이러한 결과는 회분의 큰 열용량, 회분의 기화잠열과 상대적으로 적은 고정탄소의 함량으로 인한 연소성 저하로 사료된다. 결과적으로 고회분탄은 높은 활성화 에너지(E)를 가진다. The char oxidation characteristics of high ash coal were experimentally investigated at several temperatures (from 900 to 1300°C) for 4 types of coals (Gunvor, Glencore, Noble, and ECM) under atmospheric pressure in a drop tube furnace (DTF). The char reaction rate was calculated from the exhaust gas concentrations (CO and CO₂) using FTIR, and the particle temperature was measured using the two-color method. In addition, the activation energy and preexponential factor for high ash coal char were calculated based on the Arrhenius equation. The results show that as the ash content increases, the particle temperature and area reactivity decreases. This is because in high ash coal, the large heat capacity of the ash, ash vaporization, and relatively low fixed carbon content of ash suppress combustibility during char oxidation. As a result, the higher ash content of coal leads to high activation energy.
무증자 (無蒸煮) 전분법에 의한 알코올생산 화학적 호화법 (糊化法)
박관화(Kwan Hwa Park),오병하(Byung Ha Oh),이계호(Ke Ho Lee) 한국응용생명화학회 1984 Applied Biological Chemistry (Appl Biol Chem) Vol.27 No.1
Ethanol fermentation from the chemically gelatinized starchy material was examined. The critical concentration of sodium hydroxide solution for gelatinization was dependent on the species of starch; 0.4M for potato and 0.6M for tapioca at room temperature. For alcohol fermention the starchy material was gelatinized by addition of sodium hydroxide solution, neutralized by sulfuric acid, and then yeast was added. The amount of CO₂ evolved during ethanol fermentation indicates that non-fermentable material was not produced from the starch by chemical gelatinization. In ethanol fermentation of potato and tapioca starch no significant difference was observed between the thermal and the chemical gelatinization.
고혈압 환자 마취시 Transdermal Clonidine (St 155 BS) 의 임상적 유용성
이현화(Hyun Hwa Lee),김동옥(Dong Ok Kim),김건식(Ke 대한통증학회 1993 The Korean Journal of Pain Vol.6 No.2
N/A Clonidine, a centrally-acting antihypertensive agent known to reduce central sympathetic outflow and modulate presynaptic transmitters release, has shown to suppress central noradrenergic hyperactivity induced by immobilization stress in animals, by decreasing the MAC of halothane and the dose of narcotics required to prevent reflex cardiovascular response to noxious stimuli, and to have potent analgesic properties in humans. These characteristics suggest that clonidine might be a useful adjunct to the anesthetic management of patients with preexisting hypertension. Accordingly, we determined the clinical efficacy and safety on analgesia, sedation and hemo- dynamic stability in the perioperative period. Thirty patients(ASA physical status II-III) with a history of arterial hypertension, scheduled for elective orthopedic surgery were randomly assigned to two groups. We applied CPA-cloni- dine patch(6.9 mg/cm2, 0.2 mg delivered daily) or placebo patch to each groups, 48 hours prior to induction of anesthesia. Antihypertensive medication was continued until the morning of the scheduled surgery. All patients received premedication of atropine and lorazepam, and induced anesthesia with thiopental and succinylcholine, and maintained with enflurane and 50% ni- trous oxide, while sustaining the BP and pulse rate at acceptable range. For the relief of pain postoperatively, diclofenac and fentanyl were administered intramuscularly on demand. The results were as follows. 1) The change of hemodynamic responses in clonidine group was less compared to the place- bo group. 2) Intraoperative anesthetic requirement for enflurane in clonidine group were significantly lower than placebo group. 3) Postoperative analgetic requirement in clonidine group were significantly lower than pla- cebo group. In clonidine group, 5 cases out of 15 cases were required no analgetics, and the inci- dence of administration of additional fentanyl was decreased to 5 cases, comparing with 10 cases in placebo group.
흰쥐 두개골결손을 이용한 황산칼슘 및 탈회골 복합충진재의 골재생 촉진효과 연구
이은정 ( Eun Jung Lee ),전성현 ( Seong Hyun Jeon ),채지화 ( Ji Hwa Chae ),허재원 ( Jae Won Heo ),강계원 ( Ke Won Kang ),김진 ( Jin Kim ),김경표 ( Kyoung Pyo Kim ),이광원 ( Kwang Won Lee ) 한국조직공학·재생의학회 2009 조직공학과 재생의학 Vol.6 No.1
Calcium sulfate is widely used for bone grafts as binder and expander. It was also reported that carboxymethylcellulose(CMC) can improve chemical characteristics for clinical applications when it is used as binder of calcium sulfate and demineralized bone matrix(DBM) for particulate bone grafts. DBM is an osteoinductive material which has been used to reconstruct bone tissue in maxillocraniofacial surgery, periodontics, and orthopedics. In this study, the effects of CMC-based putties containing DBM and/or calcium sulfate hemihydrate were evaluated in rat skull defects. Radiographs and histological evaluation of defect area after a period of time showed healing progress and new bone appeared greater for the treatment of CMC-based calcium sulfate hemihydrate putty compared to the untreated defect. When DBM was added to the putty, the most prominent bone regeneration effect was observed. We conclude that fast-resorbing CMC-based calcium sulfate hemihydrate putty containing DBM is effective for healing from the defective bone. CMC-based calcium sulfate may be used as a carrier and binder of bone graft materials for the restoration of bony defects.