Polymer Light Emitting Diode의 발광특성 연구 : A study on electoluminescence properties of PLED with poly [2-(2'-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene]

이상협;배형철;송석태;한찬수;채희백 순천향대학교 기초과학연구소 2010 순천향자연과학연구 논문집 Vol.16 No.2

In order to know how the [2-(2'-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene] (MEH-PPV) layer works in organic light emitting diode, two different types of devices were fabricated, which are MEH-PPV single layer devices and MEH-PPV/tris (8-hydroxy-quinoline)aluminium(Alq3) bilayer devices. On the indium-tin-oxide(ITO) glass anode MEH-PPV layer was first spin-coated, and the Alq3 layer and the aluminium(Al) anode were vapor-deposited sequentially. The devices shows a trend that has lower current, luminous efficiency in case the thickness of the device is larger. Some bilayer devices, however, show more improved performance than other devices of smaller total thickness. This results were discussed on the basis of improved exciton formation resulting from balanced carrier transport.

국제수도협회(IWA) Specialist Conference 참관기 "Nano and Micro Particles in Water and Wastewater Treatment"

이상협,권순범,박규홍,한무영 대한상하수도학회 2003 상하수도학회지 Vol.17 No.5

물 및 디메틸포름아마이드中에서 4-(2-Pyridylazo)-resorcinol의 分光電氣化學的 環元

李興洛,裵俊雄,李在鶴,吳相協 慶北大學校 1988 論文集 Vol.45 No.-

Spectroelectrochemistry involve the combination of an electrochemical technique with a spectroscopic techinque so that the two measurements may be performed simultaneously in an electrochemical cell. One of the most generally useful spectroelectrochemical technique involves spectral observation of a thin layer of solution. Thin-layer spectroelectrochemistry at the optically transparent thin-layer electrode(OTTLE) takes advantage of the rapid electrolysis (30∼60 sec.) and small volume features of thin-layer electrochemistry. This study has used controlled potential as the excitation signal. Potential control provides a facile means of presicely adjusting the redox potential of the thin solution layer as determined by the Nernst equation for reversible systems: E_applied=E^0'+0.059/n log (O)/(R) In experiment, the slopes of Nernstian plot were 28.3mV in aqeous solution and 53mV in N, N-dimethylformamide(DMF) solution. The results of this study showed that the reduction mechanisms of 4-(2-pyridylazo)-resorcinol(PAR) were one two-electron step in aqueous solution and two one-electrons steps in DMF solution. The formal reduction potentials(E^0') of the PAR were -0.574 volts vs. S.C.E. in aqueous soltion and -0.74 volts vs. Ag/AgClO_4 in DMF solution. These results were generally similar to the reduction mechanism of the other cyclic hydrocarbons in the aprotic solvent. In aprotic solvent, the product of the first electron transfer is expected to be a relatively stable anion radical. In this experiment tetraethylammonium perchlorate was used as a supporting electrolyte of the DMF solution.

腦卒中後 腦萎縮에 대한 調經論的 接近

윤상협,이종수 경희대학교 동서의학연구소 2001 東西醫學硏究所 論文集 Vol.2000 No.-

Objective : The aim of this study was to investigate the neuroprotection effect of estrogen on brain atrophy following cerebral infarction. Method : All animals in this study were classified into 4 groups; ovariectomy group (OVXgroup), cerebral infarction group (INF group), combination ovariectomy and cerebral infarction group ( OVX + INF group), and naturally intact group for control data (NOR group ). Cerebral infarction was made by Chen's method with some modification. Ovariectomy was performed by Wayforth's method. Experimental data for each group was collected at 15days, 1 month, 3 months, and 6 months after starting observation. Serum 17β-estradiol(E2) was determined by radioimmunoassay. Brain volume was measured and calculated with image analysis. Each brain was sliced at intervals of 2mm in chamber after 30 min of freezing in refregerater. Cerebral volume was obtained by sum of volume of each slice level, which was mean area × 2mm. Results : Cerebral ischemia was fou8nd to decrease the serum concentration of 17β-estradiol and to inhibit the physiologically conpensatary function of the ovariectomized rats. Also we found that deprivation of estrogen have resulted in more severe cerebral atrophy followed by cerebral infarction. Conclusion : It is suggested that estrogen has a neuroprotection effect on cerebral atrophy following cerebral infarction.(J Korean Oriental Med 2000;21(4):9-15)

혼파초지에서 질소시비수준과 방목율이 목초 및 육우생산에 미치는 영향

현봉수,김문철,김영호,송성언,이승협 제주대학교 농과대학 제주도축산문제연구소 1986 畜産論叢 Vol.1 No.1

Effects of N fertilizer levels and stocking rates on beef production in a mixed pastiire of orchard-grass, perennial ryegrass, tall fescue, red clover and alsike clover were studied using 3 levels of N fertilizer (50, 100 and 200 kg/ha) and 3 stocking rates (3,4 and 5 head /ha). The summarized results are the following; 1. Increasing nitrogen fertilizer on the mixed pasture increased dry matter yield and protein content(P<0.05) of the pasture species. The stocking rate did not influence either dry matter yield or protein content. 2. The percentage of pasture species increased and that of weeds decreased with increasing N fer-tilizer levels. lncreasing stocking rate from 3 to 5 heads/ha significantly influenced that of the other pastures and weeds. 3. Herhage intake per animal increased at the lower stocking rate, but total herbage intake per ha increased at the higher stocking rate, Increasing nitrogen fertilizer decreased herbage intake per animal , but slightly higher intake per animal was obserbed at 5 head stocking rate. 4. No significant difference in weight gain/ha was found among N levels and stocking rates ussd. Live weight gain per animal was greater at the higher N level and also at the louer stocking rate.

消化器癌의 症候와 治療에 관한 文獻的 考察

김현아,임성우,윤상협,이원철 동국대학교 한의학연구소 1998 東國韓醫學硏究所論文集 Vol.6 No.2

근래 들어 악성종양의 발병률은 점점 상승하고 있으며 소화기암은 전체 악성종양중 높은 발생빈도를 보이는 질병으로 한의학계에서도 치료를 위해 많은 연구를 하고 있다. 소화기암의 증후와 치료에 관하여 ??膈, 反胃, 積聚, 臟毒을 위주로 明ㆍ淸代까지의 歷代 文獻을 통해 考票한 결과 이는 복강내 악성종양과 증후에 있어서 유사성을 나타내며 치료는 초기에는 祛邪法을, 중기에는 攻補兼施를, 후기에는 扶正法을 위주로 하는 것으로 나타났다. 역대 문헌에서는 이에 대한 처방구성을 다양하게 언급하여 향후 소화기암 치료에 응용할 수 있을 것으로 思料된다. In these days, the outbreak rate of a malignant tumor is gradually increasing, and the frequency of digestive organ's cancer is so high that the remedy is being studied in the Oriental Medicine Worid. I made a consideration the Erlgyuk(?膈), the Panwue(反胃), the Juckchui(績聚), the Jangdok(臟毒), on the symptom and treatment of gastrointestinal cancer, with the successsive literatures of the Myung and Chung Dynasty. In consequence, these are similar to the symtom of malignant tumor in abdominal cabity, and the the treatment is divided into three stages by each period. The Geosa-method(祛邪決) is used in the early stage, and in the middle the Gongbokyumsi-me��攻補兼施), and in the latter stage the Pujung-method(扶正法) is used. The successiv literatures shows the prescription of gastrointestinal cancer in variety. Therefore, I thinf the various prescription will be applied to gastrointestinal cancer on forward.

Foreign-body Granuloma After Honeybee Acupuncture

Lee, Sang Hyub,Sung, Kyung Jeh,Koh, Jai Kyoung Korean Dermatological Association 1996 Annals of Dermatology Vol.8 No.3

A case of foreign body granuloma after bee sting therapy

( Sang Hyub Lee ),( Dae Hun Suh ),( Jee Ho Choi ),( Kyung Jeh Sung ),( Jai Kyoung Koh ) 대한피부과학회 1994 대한피부과학회 학술발표대회집 Vol.46 No.2

Bilateral Infarction of the Recurrent Arteries of Heubner Following Clipping of an Anterior Communicating Artery Aneurysm

Sang Hyub Lee,이철희,박인성,한종우 대한뇌혈관외과학회 2018 Journal of Cerebrovascular and Endovascular Neuros Vol.20 No.1

A 50-year-old woman reported to the emergency department with thunderclap headache and vomiting. Non-enhanced brain computed tomography (CT) showed a subarachnoid hemorrhage of Hunt-Hess Grade II and Fisher Grade III. Brain angiography CT and transfemoral cerebral angiography (TFCA) revealed an aneurysm of the anterior communicating artery. A direct neck clipping was performed using the pterional approach. The post-operation CT was uneventful. Six days postoperatively, the patient became lethargic. The mean velocity (cm/s) of the middle cerebral artery peaked at 173 cm/s on the right side and 167 cm/s on the left. A TFCA revealed decreased perfusion in both recurrent arteries of Heubner (RAH), but no occlusion in either. Intra-arterial nimodipine injection was administered. On the 7th postoperative day, CT demonstrated a newly developed low-density lesion in the RAH territory bilaterally. The cause of the infarction was attributed to decreased perfusion caused by cerebral vasospasm. The patient was discharged with no definite neurologic deficit except for mild cognitive disorder.

Outcomes of the Conventional versus Pocket-Creation Method for Endoscopic Submucosal Dissection of Gastric Body Tumors Using a Dual Knife: A Retrospective Study

Lee Sang Pyo,Jang Hyun Joo,Kae Sea Hyub,Lee Jae Gon 거트앤리버 소화기연관학회협의회 2023 Gut and Liver Vol.17 No.4

Background/Aims: Various endoscopic submucosal dissection (ESD) methods for gastric tumors have been tried. However, no studies have yet compared results according to the ESD method for gastric body tumors using a dual knife. The objective of this study was to compare outcomes of two ESD methods for gastric body tumors: the pocket-creation method and conventional method. Methods: Patients who underwent ESD for a gastric body tumor were retrospectively reviewed. Patients were divided into two groups according to the ESD method: the conventional method (group I) and pocket-creation method (group II). Characteristics of patients and tumors, hospitalization period, incidence of complications, resection margin status, incidence of surgical operation, procedure time, and laboratory findings were investigated. Results: Of the total of 100 patients, 52 belonged to group I and 48 to group II. All tumors were successfully resected en bloc. Resection margin involvement was found in six (11.5%) of group I and six (12.5%) of group II. Complications were observed in seven (13.5%; major complication five, minor two) of group I and eight (16.7%; major two, minor six) of group II. There were no significant differences in ESD outcomes such as hospitalization period, incidence of complications, resection margin status, incidence of surgical operation, procedure time, or inflammatory response after ESD between the two groups. Conclusions: Both methods are suitable for treating gastric body tumors with adequate treatment success rates and comparable complication rates.