NH₃ 분위기에서 후속 열처리에 의한 p형 ZnO 형성

정은수,김홍승,조형균,Jung, Eun-Soo,Kim, Hong-Seung,Cho, Hyung-Kun 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.7

We report the preparation of N doped, p-type ZnO films by post-annealing in $NH_3$ ambient. The properties were examined by XRD, Hall-effect measurement, PL, and SIMS. ZnO films showed better crystallinity and electron concentration of $10^{15}-10^{17}/cm^3$ with post-annealing in $NH_3$ ambient. These films were converted to p-type ZnO by activation thermal annealing process at $800^{\circ}C$ under $N_2$ ambient. The electrical properties of the p-type ZnO showed a hole concentration of $1.06\times10^{16}/cm^3$, a mobility of $15.8cm^2/V{\cdot}s$, and a resistivity of $40.18\Omega{\cdot}cm$. The N doped ZnO films showed a strong photoluminescence peak at 3.306 eV at 13 K, which is closely related to neutral acceptor bound excitons of the p-type ZnO:N. In the SIMS spectra, the incorporation of nitrogen was confirmed.

Reduced Precision Floating Point를 활용한 Ray Tracing 분석 연구

정은수(Eun Soo Jung),정연희(Yeonhee Jung),윤명국(Myung Kuk Yoon) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6

To address the inefficiency issue of single or double precision floating point (FP) operations, which demands significant memory bandwidth and energy usage in ray tracing rendering, this study proposes the application of a single reduced precision FP format to ray tracing. Reduced precision FP refers to a FP data type that reduces the number of bits in the exponent and mantissa of the existing FP. Although this results in higher operational and memory efficiency than the existing method, it also has the disadvantage of relatively lower accuracy, resulting in more data loss. This paper demonstrates that even when reduced precision FP operations are applied to ray tracing, the resulting images are comparable to those generated by the conventional method. Furthermore, based on experiments and analyses of various precisions, this paper proposes a precision that is suitable for ray tracing.

증례 : 감염 ; 장티푸스와 렙토스피라병의 동시 감염 1예

송은훈 ( Eun Hoon Song ),김민정 ( Min Jeong Kim ),전해리 ( Hae Ri Chon ),고봉진 ( Bong Jin Ko ),서정연 ( Jung Yeon Seo ),정은수 ( Eun Soo Jeong ),최석훈 ( Seok Hoon Choi ) 대한내과학회 2010 대한내과학회지 Vol.79 No.3

열성 질환의 동시감염은 각 질환의 유사한 임상양상으로 인하여 진단 및 치료에 있어 혼란을 가져온다. 국내 및 해외 학회에서는 동시감염으로 인해 진단 및 치료에 있어서 어려움이 있었던 예들이 보고되어지고 있으나 장티푸스와 렙토스피라병의 동시감염은 아직 보고된 바가 없었다. 저자들은 초기 항생제 치료에 반응을 보이지 않았던 장티푸스에서 렙토스피라병의 동시감염을 진단하였고, 항생제 병용으로 치료한 1예를 경험하였기에 보고하는 바이다. A 37-year-old male patient presented with a fever, chills, and abdominal pain. The patient was diagnosed with Typhoid fever based on blood culture, but did not clinically respond to standard antibiotic (Ceftriaxone) therapy. On day 9, leptospira serology was positive and doxycycline was added to the treatment strategy. With combination therapy, the patient recovered from the infection. In most cases, similar clinical presentations make the diagnosis of concurrent infections of febrile diseases difficult, and serious complications can develop as a consequence of delayed treatment. As with this case, if the patient initially has serious a medical condition caused by complications, and does not clinically respond to initial standard antibiotics therapy or has an unusual course of disease, concurrent infection must be considered. (Korean J Med 79:331-334, 2010)

열처리한 ZnO 박막 내의 산소 농도 변화에 따른 구조적, 광학적 특성 연구

이주영,김홍승,정은수,장낙원,Lee, Ju-Young,Kim, Hong-Seung,Jung, Eun-Soo,Jang, Nak-Won 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.7

We studied that structural and optical properties of ZnO films depend on oxygen contents. ZnO films were deposited on Si (111) substrates at room temperature by rf sputtering system and the thickness of films was 100 nm. The ZnO films were annealed in thermal furnace for 2 h at 800 and $900^{\circ}C$ in $H_2O,\;N_2$, and air ambient gases to control oxygen contents. We used AES, PL, XRD, AFM. As our result, crystal quality and luminescence improved until O/Zn is 1. However, when O/Zn ratio Is larger than 1, the structural and optical properties were getting worse.

Si(111) 기판 위에 증착된 ZnO 박막의 열처리 분위기에 따른 구조적, 광학적 특성 연구

이주영,김홍승,정은수,장낙원,Lee, Ju-Young,Kim, Hong-Seung,Jung, Eun-soo,Jang, Nak-Won 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.8

Zinc oxide films were deposited on Si (111) substrates by radio-frequency (rf)sputtering at a room temperature and post annealed in Na, air, and $H_2O$ ambient at temperatures between $800{\circ}C$ for 2 hrs. The properties were investigated by atomic force microscope (AFM), X-ray diffraction (XRD), Auger electron spectroscopy (AES) and photoluminescence (PL). Our experiments demonstrated that ZnO films have the better crystal quality for post thermal annealing and especially in $H_2O$ ambient. Even though thermal annealing reduced deep level emission somewhat, for further getting rid off deep level emission, oxygen contents should be adjusted. In our results, $H_2O$ ambient gave the best structural and optical properties.

유기농법에 의해 재배된 열무김치의 품질 및 기능적 특성

정수진(Su-Jin Jung),소병옥(Byung-Ok So),신상욱(Sang-Wook Shin),노순옥(Sun-Ok Noh),정은수(Eun-Soo Jung),채수완(Soo-Wan Chae) 한국식품영양과학회 2014 한국식품영양과학회지 Vol.43 No.8

유기농법으로 재배한 친자연개발퇴비열무(YR-FNC), 일반퇴비열무(YR-GC)와 일반관행농법인 화학비료로 재배한 일반열무(YR-Control)로 김치를 제조하여 발효기간의 경과에 따른 품질특성, 관능적 특성 및 기능성에 대한 차이를 관찰하였다. 열무의 일반영양성분 중 수분 및 조단백질의 함량은 유기농 열무(YR-FNC, YR-GC)보다 일반열무(YRControl)에서 높았으나 식이섬유소 및 비타민 C의 함량은 유기농 열무에서 높았다. 무기질 중 인과 구리의 함량은 유기농 열무가 높은 반면 질소, 칼륨, 칼슘, 마그네슘, 철, 망간 및 아연의 함량은 일반열무(YR-Control)에서 높게 나타났다. 일반열무김치(YR-Control)는 발효진행의 속도가 빠르게 진행이 되어 적숙기 pH에 빨리 도달하였고, 유기농 열무김치(YR-FNC, YR-GC)는 발효가 서서히 진행되어 저장성이 길어지는 경향을 확인하였다. 당초 열무김치 담금 초기(0일)부터 열무김치의 총 폴리페놀과 총 플라보노이드의 함량은 유기농 열무김치(YR-FNC, YR-GC)의 경우 일반열무김치(YR-Control)에 비해 약 1.5∼3배가 높은 수준으로 나타났으며 발효기간이 경과되면서 일반열무김치(YR-Control)와 유기농 열무김치(YR-FNC)에서 유의적으로 증가하였다. 김치 발효 7일째에 김치의 젖산균인 lactic acid bacteria 함량과 총 균수(total microbial)는 일반열무김치(YRControl)에 비해 유기농 열무김치(YR-FNC)에서 높은 수준이었다. 발효기간이 경과하면서 유기농 열무김치는 관능적품질의 특성이 우수하였고 저장성을 연장시킬 수 있는 가능성을 시사한다. 따라서 일반관행농법으로 재배한 일반열무김치에 비해 유기농 열무김치를 섭취함으로써 맛의 증진 효과뿐만 아니라 고기능성 생리활성물질을 높게 섭취할 수 있어 기능성식품 소재로서의 개발 가능성을 기대할 수 있을 것으로 사료된다. This study compared and analyzed the physiochemical and quality characteristics of young radish kimchi made with YR-FNC or YR-GC cultivated by organic farming as well as kimchi made with young radish cultivated by chemical composting/general farming (YR-Control). YR-Control showed higher contents of water and crude protein than YR-FNC and YR-GC kimchi but lower contents of crude ash, dietary fiber, and vitamin C. YR-FNC and YR-GC kimchi also showed higher contents of P and Cu than YR-Control but lower contents of N, K, Ca, Mg, Fe, and Zn. YR-Control fermentation progressed faster than that of YR-FNC or YR-GC after 24 days, and YR-Control more rapidly reached an appropriate pH. On the other hand, YR-FNC and YR-GC kimchi fermentation progressed slow and did not reach a pH level below 5.3. For period of fermentation, YR-Control and YR-FNC kimchi showed no significant difference in reducing sugar content, whereas that of YR-GC kimchi decreased significantly after 24 days of fermentation (P<0.002). YR-FNC and YR-GC kimchi showed 1.5~3 times higher total polyphenol and flavonoid contents than YR-Control at the beginning of fermentation, whereas YR-Control and YR-FNC kimchi showed a significant increase in total polyphenol and flavonoid contents during the fermentation period. By day 7 of fermentation, YR-FNC kimchi showed higher contents of lactic acid bacteria and total microbes than YR-Control. In the sensory evaluation, YR-FNC and YR-GC kimchi showed higher preference values than YR-Control. Therefore, kimchi made from young radish cultivated by organic farming has a longer freshness period than control kimchi and is characterized by excellent sensory quality, increased physiological contents, and improved beneficial health effects.

난원공개존을 통한 기이성 신 색전증 1예

임대섭 ( Dae Seop Lim ),정은수 ( Eun Soo Jeong ),정진성 ( Jin Sung Jung ),장세헌 ( Se Heon Chang ),유승현 ( Seung Hyen Yoo ),장우진 ( Woo Jin Jang ),정시정 ( Shi Jung Chung ) 대한신장학회 2011 Kidney Research and Clinical Practice Vol.30 No.6

Paradoxical embolism is a kind of stroke caused by embolism of thrombus of venous origin through a lateral opening in the heart, such as a patent foramen ovale (PFO). Although the most frequent manifestation of paradoxical embolism is cryptogenic stroke, noncerebral paradoxical embolism is also associated with PFO. We experienced a case of cryptogenic renal infarction in a previously healthy 70-year-old man. He had no cardiac thrombus on transthoracic echocardiography and electrocardiogram revealed a normal sinus rhythm. Because it was cryptogenic renal infarction, we performed transesophageal echocardiography with microbubble test. Microbubble test using agitated saline proved the presence of right-to-left shunt and patent foramen ovale was diagnosed. We also performed lower leg doppler ultrasonogram, but there was no evidence of deep vein thrombosis. Although only the presence of a right-to-left shunt is not enough to establish the diagnosis of paradoxical embolism, it is uncommon for the source of the embolism to be identified. In this case, we concluded that paradoxical embolism is the cause of renal embolism. We report paradoxical renal embolism through PFO with review of relevant literatures.

혼합곡 식이의 지구력 향상 효과

오홍근(Hong-Geun Oh),박정우(Jung-Woo Park),강영례(Young-Rye Kang),김정훈(Jung-Hoon Kim),서민영(Min-Young Seo),김민걸(Min-Gul Kim),두재균(Jae-Kyun Doo),신동화(Dong-Hwa Shin),정은수(Eun-Soo Jung),채수완(Soo-Wan Chae),김옥진(Ok-Jin Kim) 한국식품영양과학회 2011 한국식품영양과학회지 Vol.40 No.12

본 연구에서는 4주간 혼합곡 식이를 공급하여 treadmill을 통한 운동시간과 glycogen 저장능력 변화를 관찰함으로써 지구력 개선에 대한 평가를 하였다. 7주령 SD rats은 정상군 (Nor, 정상식이, n=6), 대조군(Con, 20% 정상식이+80% milled rice, n=6), GⅠ(혼합곡 식이 Ⅰ, n=6), GⅡ(혼합곡 식이 Ⅱ, n=6), GⅢ(혼합곡 Ⅲ, n=6)와 GⅣ(혼합곡 식이 Ⅳ, n=6) 으로 임의 군배정을 하였다. 지구력 시험은 24일간의 적응 훈련과 혼합곡식이 공급을 한 후 실시하였다. 운동 지속 시간과 glycogen 저장능력은 혼합곡식이 공급에 의해서 증가하였다. 더욱이 25 min 운동 그리고/또는 탈진 시까지의 운동 후에서 혈액 내 무기질인, CPK와 lactate의 농도는 혼합곡 투여에 의하여 감소하였으나, GOP, GTP, lactate LDH의 농도는 군간 차이는 보이지 않았다. 본 연구에서는 4주간의 혼합곡 식이가 운동 지속 시간과 glycogen 장 능력이 증가되었으며, 피로물질인 무기질인, CPK와 lactate의 농도가 감소시킴으로써 지구력 개선에 도움을 줄 것으로 생각된다. This study evaluated the effect of multigrain supplementation on exercise-related changes in running time and glycogen storage capacity of male SD rats engaged in treadmill exercise. Thirty-six 6-week-old rats were divided into six groups: normal (Nor) fed normal feed, control (Con) fed with 20% normal feed and 80% milled rice, test group one (GI) fed with multigrain feed I, test group two (GII) fed with multigrain feed II, test group three (GIII) fed with multigrain feed III, and test group four (GIV) fed with multigrain feed IV. Endurance tests by treadmill machine were administered after 24 days of multigrain feed supplementation and adaptive training. Running time was extended and glycogen storage capacity increased in the multigrain-treated group compared to the non-treated group. Also, the fatigue indicators of inorganic phosphorous, CPK, and lactate concentration were all reduced in the multigrain feed group compared to the control group after 25 min and/or exhausted exercise. But there was no difference in GOP, GTP, lactate, or LDH concentrations between the groups. Our results demonstrated that endurance improved with multigrain feed in rats. Specifically, running time, glycogen storage capacity, inorganic phosphorous, CPK, and lactate serum concentration increased. Importantly, the improvements in endurance brought about in the GII group fed with waxy barley was the greatest among the experimental groups.

CMMI 성숙도 레벨에 기반한 소프트웨어 개발 조직의 품질비용 관리 모델 개발에 관한 연구

박철구 ( Cheol Gu Park ),한동준 ( Dong Joon Han ),정은수 ( Eun Su Jeong ),김수영 ( Soo Young Kim ),송은정 ( Eun Jung Song ),이영곤 ( Young Gon Lee ),김창은 ( Chang Eun Kim ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.1

소프트웨어의 크기가 커지고 복잡도가 증가함에 따라 소프트웨어 품질의 중요성은 점점 증대되고 있다. 소프트웨어의 품질 향상을 위해 소프트웨어 개발 조직은 테스트와 동료검토와 같이 제품 품질 향상을 위한 노력과 CMMI(Capability Maturity Model Integration), 소프트웨어프로세스 품질인증 기준과 같은 프로세스 품질 향상 노력을 하고 있다. 그러나 이러한 소프트웨어 분야의 품질 관리의 노력과 효과에 소요되는 품질비용에 대한 연구는 제조업이나 건설업 등 타 분야에 비해 부족한 실정이다. 본 연구에서는 소프트웨어 프로세스 개선을 위한 모델인 CMMI의 성숙도 레벨에 기반하여, K사의 품질비용 관리 방안 적용 결과를 바탕으로 CMMI 성숙도 각 레벨마다 소프트웨어 개발 조직이 품질비용을 관리를 위한 목적과 활동으로 정의된 품질비용 관리 모델의 개발을 연구하였다.

회전자 인버터 내장형 Brushless 동기 전동기 설계

도상화(Sang-Hwa Do),이병화(Byung-Hwa Lee),채승희(Seung-Hee Chae),홍정표(Jung-Pyo Hong),정은수(Eun-Soo Jung),설승기(Seung-Ki Sul) 대한전기학회 2011 대한전기학회 학술대회 논문집 Vol.2011 No.7