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멀티비트 정보저장을 위한 적층 구조 상변화 메모리에 대한 연구
이동근,김승주,류상욱,Lee, Dong-Keun,Kim, Seung-Ju,Ryu, Sang-Ouk 한국반도체디스플레이기술학회 2009 반도체디스플레이기술학회지 Vol.8 No.1
In PRAM applications, the devices can be made for both binary and multi-state storage. The ability to attain intermediate stages comes either from the fact that some chalcogenide materials can exist in configurations that range from completely amorphous to completely crystalline or from designing device structure such a way that mimics multiple phase chase phenomena in single cell. We have designed stack-structured phase change memory cell which operates as multi-state storage. Amorphous $Ge_xTe_{100-x}$ chalcogenide materials were stacked and a diffusion barrier was chosen for each stack layers. The device is operated by crystallizing each chalcogenide material as sequential manner from the bottom layer to the top layer. The amplitude of current pulse and the duration of pulse width was fixed and number of pulses were controlled to change overall resistance of the phase change memory cell. To optimize operational performance the thickness of each chalcogenide was controlled based on simulation results.
다공성 스티렌 - 디비닐벤젠 공중합 수지 촉매에서 황산기 분포에 따른 MTBE 합성 및 분해반응의 특성 변화
이동근,김성배,안주현 ( Dong Keun Lee,Sung Bae Kim,Jou Hyeon Ahn ) 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.1
Sulfonated Poly(styrene-co-divinylbenzene) resin catalysts were prepared to have two different types of sulfonic acid group distribution: the one having sulfonic acid group distributed uniformly throughout gelular microparticles, the other having sulfonic acid group located mainly at the exterior surface of gelular microparticles. MTBE synthesis and cracking reaction were carried out on the catalysts, and the changes in characteristics of the reactions with sulfonic acid group distributions were investigated. The activity and selectivity of the reactions were always much higher on the catalyst having sulfonic acid group outside the gelular microparticles(type E catalyst) than on the one with uniform distribution(type A catalyst), and this was thought to be due to gelular microparticle diffusion limitation and secondary reaction on the sulfonic acid group within gelular particles.
과루해백백주탕과 과루해백반하탕을 이용한 본태성 비정형성 흉통 환자 호전 2례
이동근,황선혜,고지윤,손아현,신현수,Lee, Dong-keun,Hwang, Seon-hye,Koh, Ji-yoon,Son, Ah-hyun,Shin, Hyeon-su 대한한방내과학회 2017 大韓韓方內科學會誌 Vol.38 No.3
Objective: The purpose of this study was to evaluate the effects of traditional Korean medicine, including Gwaruhaebackbackju-tang and Gwaruhaebackbanha-tang, on idiopathic atypical chest pain. Method: Herbal medicine and acupuncture were carried out. NRS scores were used to evaluate the effect of the treatments. Results: After the treatments, the patients' chest pain improved, as the NRS score decreased. Conclusion: This study suggests that traditional Korean medicine treatments might be effective for idiopathic atypical chest pain.
적외선 마이크로 볼로미터를 위한 $Si_{1-x}Sb_x$ 박막의 특성
이동근,류상욱,양우석,조성목,전상훈,류호준,Lee, Dong-Keun,Ryu, Sang-Ouk,Yang, Woo-Seok,Cho, Seong-Mok,Cheon, Sang-Hoon,Ryu, Ho-Jun 한국반도체디스플레이기술학회 2009 반도체디스플레이기술학회지 Vol.8 No.3
we have studied characterization of microbolometer based on the co-sputtered silicon-antimony ($Si_{1-x}Sb_x$) thin film for infrared microbolometer. We have investigated the resistivity and the temperature coefficient of resistance (TCR) with annealing. We deposited the films using co-sputtering method at $200^{\circ}C$ in the Ar environment. The Sb concentration has been adjusted by applying variable DC power from Sb targets. TCR of deposited $Si_{1-x}Sb_x$ films have been measured the range of -2.3~-2.8%/K. The resistivity of the film is low but TCR is higher than the other bolometer materials. Resistivity of the films has not been affected hugely according to the low annealing temperature however the resistivity has been dramatically decreased over $250^{\circ}C$. It is caused of a phase change due to the rearrangement of Si and Sb atoms during crystallization process of the films.
야간뇨에 적용한 직접구 시술의 효과에 대한 전향적 연구
이동근,모민주,이재욱,박아름,김은서,고지윤,손아현,신현수,Lee, Dong-keun,Mo, Min-ju,Lee, Jae-wook,Park, A-reum,Kim, Eun-seo,Koh, Ji-yoon,Son, Ah-hyun,Shin, Hyeon-su 대한한방내과학회 2017 大韓韓方內科學會誌 Vol.38 No.5
Objective: The purpose of this study was to evaluate the effects of direct moxibustion on nocturia. Methods: Thirty-one nocturia patients were treated with direct moxibustion. Results: After the treatments, the numbers of nocturia incidences were reduced. Conclusions: Direct moxibustion might be effective as a treatment for nocturia.
티타니아 담지 코발트 촉매를 이용한 일산화탄소 수소화 반응에서 칼륨 첨가에 의한 선택성 변화
이동근,안주현 ( Dong Keun Lee,Jou Hyeon Ahn ) 한국공업화학회 1990 공업화학 Vol.1 No.1
칼륨과 티타니아 담체가 일산화탄소 수소와 반응에서 분자량이 큰 불포화 탄화수소의 합성에 유리할 것으로 예상하여, 칼륨염이 첨가된 티타니아 담지 코발트 촉매를 제조하여 일산화탄소 수소화 반응에 사용하였다. 칼륨과 티타니아 담체는 일산화탄소 수소화 반응에서 분자량이 큰 불포화 탄화수소 화합물을 합성하는 데 있어 중요한 역할을 하였을 뿐 아니라, 탄소 누적에 의한 촉매의 비활성화 방지에도 기여하였다. 이는 티타니아 담체가 코발트 금속과 강한 상호작용을 하고, 칼륨은 코발트 금속에 전자를 풍부하게 하는 전자 공급자로 작용하여 일산화탄소의 흡착력을 증가시켰기 때문으로 믿어진다. Small amounts of potassium were added to the titania - supported cobalt catalysts in order to produce higher and olefinic hydrocarbons in CO hydrogenation. Titania and potassium played important roles not only for the enhancement of the production of higher and olefinic hydrocarbons, but also for the prevention of the catalyst deactivation by carbon deposits. Titania support induced the so-called SMSI, and potassium seemed to act as an electronic modifier, giving rise to an electron enrichment of the metallic phase.
이동근,손아현,강미정,신현수,Lee, Dong-keun,Son, Ah-hyun,Kang, Mi-jung,Shin, Hyeon-su 대한한방내과학회 2016 大韓韓方內科學會誌 Vol.37 No.2
Objective: This study evaluates the effects of traditional Korean medicine (including Guibi-tang) on a psychogenic urinary incontinence patient with hypersomnia disorder.Method: Herbal medicine, acupuncture, and moxibustion were carried out. The effect of the treatments was then evaluated via the Beck depression inventory (BDI), the Beck anxiety inventory (BAI), the symptom checklist-90-revised (SCL 90-R), the Epworth sleepiness scale (ESS), and the revised urinary incontinence scale (RUIS), as well as the number of urinations, incontinence levels, and sleeping times during the day.Results: After the treatments, both the urinary incontinence and hypersomnia symptoms showed improvement.Conclusion: This study suggests that traditional Korean medicine treatments are effective in caring for patients who suffer from psychogenic urinary incontinence with hypersomnia disorder.
Selectivity Changes in CO Hydrogenation over Potassium Added Titania-supported Cobalt Catalysts
이동근,안주현,Lee, Dong-Keun,Ahn, Jou-Hyeon The Korean Society of Industrial and Engineering C 1990 공업화학 Vol.1 No.1
칼륨과 티타니아 담체가 일산화탄소 수소화 반응에서 분자량이 큰 불포화 탄화수소의 합성에 유리할 것으로 예상하여, 칼륨염이 첨가된 티타니아 담지 코발트 촉매를 제조하여 일산화탄소 수소화 반응에 사용하였다. 칼륨과 티타니아 담체는 일산화탄소 수소화 반응에서 분자량이 큰 불포화 탄화수소 화합물을 합성하는 데 있어 중요한 역할을 하였을 뿐 아니라, 탄소 누적에 의한 촉매의 비활성화 방지에도 기여하였다. 이는 티타니아 담체가 코팔트 금속과 강한 상호작용을 하고, 칼륨은 코발트 금속에 전자를 풍부하게 하는 전자 공급자로 작용하여 일산화탄소의 흡착력을 증가시켰기 때문으로 믿어진다. Small amounts of potassium were added to the titania - supported cobalt catalysts in order to produce higher and olefinic hydrocarbons in CO hydrogenation. Titania and potassium played important roles not only for the enhancement of the production of higher and olefinic hydrocarbons, but also for the prevention of the catalyst deactivation by carbon deposits. Titania support induced the so - called SMSI, and potassium seemed to act as an electronic modifier, giving rise to an electron enrichment of the metallic phase.
이동근,권경환,김용완,이은영,김은철,Lee, Dong-Keun,Kwon, Kyung-Hwan,Kim, Yung-Woan,Lee, Eun-Young,Kim, Eun-Cheol 대한악안면성형재건외과학회 1998 Maxillofacial Plastic Reconstructive Surgery Vol.20 No.3
The plunging ranula or cervical ranula is amucous extravasation cyst of the sublingual gland. It is slightly common in females, shows no side preference, and is more prevalent in the second and third decades of life. It typically manifests as a painless, nonmobile swelling in the neck. The pathogenesis of plunging ranula is the discontinuities of the mylohyoid muscle in a position that would allow extravasation of sublingual gland mucin. The histologic appearance is characteristically of a cyst, devoid of epithelium or endothelium, with a vascular fibro-connective tissue wall containing some chronic inflammatory cells and macrophages stuffed with mucin. The correct diagnosis is essential for the most effective treatment, which is exicision of the sublingual gland. The plunging ranula must be differentiated clinically and histomorphologically from thyroglossal duct cyst, dermoid cyst, branchogenic cyst, lymphangioma, laryngocele, lipoma, hemangioma, cervial thymic cyst, cysts of the parathyroid or thyroid gland, lymphadenopathy, abscess, or tumor. We report a case and review the literatures, in our case, 23-year old man were diagnosis as plunging ranula after have been taken sialogam, MRI, etc. He underwent surgery via a cervical approach. The ranula reached the anterior neck by passing through a dehiscence in the mylohyoid muscle. A pseudocyst was extirpated. Although total sublingual gland excision was not performed, no recurrence was observed during 6 months follow-up periods.