Hg₁-xMnxTe산화막의 홀효과에 관한 연구

오재근,최기영,송재흥,김영국,채건식,주유환,설정식,손인호,차성극,이상찬 慶南大學校 附設 基礎科學硏究所 1996 硏究論文集 Vol.8 No.-

HClO₄(pH:2) 수용액에서 양극산화 방법으로 HgMnTe(HMT)의 표면에 산화막을 형성 시켰다. 산화막의 두께는 SEM으로 측정하였으며 10㎛였다. 전류-전압 특성곡선을 얻어 산화 피크 전압으로부터 HTeO₂?, TeO?, HHgO₂? 막이 형성되었음을 알 수 있었다. 산화시키지 않은 HMT와 HClO₄수용액에서 산화시킨 HMT에 대해 Hall전압 및 자기저항을 각각 측정하였다. 홀전압과 자기저항은 HMT보다 HMT산화막에서 더 컸으며 이것은 HHgO₂? 공격자가 홀의 역할을 하고, TeO₄? 산화막은 전하의 포획도를 낮게하기 때문으로 생각할 수 있다. Anodic oxidation processes on HgMnTe surface has been studied in standard aqueous HClO₄(pH:2) solution. The 10㎛ thickness of the anodic oxide layers was measured by SEM. The Composition of the anodic oxide layers are evaluated from current-voltage(I-V) characteristic of HgMnTe Oxidation. The layers are composed of mixed oxide. ??, TeO₄, and?? in HClO₄solution. Transport properties have been investigated in HMT oxide layer made in HClO₄solution and virgin HMT samples at 300K. Hall voltage and magnetoresistance are greater in oxide layer HMT than virgin HMT. As a result, we know that the vacancy of ??in an anodic oxide layer acts as hole and the resulting oxide ?? layer exhibit a reduced degree of charge trapping and increase magnetoresistance.

개선된 Bridgman법으로 성장한 Bi₂Sr₂CaCu₂O_(8+δ) 單結晶의 초전도성

채건식,손인호,설정식,이수대,김영국,전동성,오재근,강성욱 경남대학교 환경문제연구소 1995 환경연구 Vol.17 No.-

The Bi₂Sr₂CaCu₂O_(8)+_(δ) single crystals are grown from the melt using a stoichiometric starting composition fer the cautions. The size and thickness of the Bi₂Sr₂CaCu₂O_(8)+_(δ) crystals depends on the cooling rate. The lower the cooling rate, the bigger and thicker the Bi₂Sr₂CaCu₂O_(8)+_(δ) crystals become. Bi₂Sr₂CaCu₂O_(8)+_(δ) X-ray diffraction(XRD) measurements of the single crystals were carried out using the radiation source of Cu Kα . In these Patterns only the (0,0,2n) diffraction appeared. The result indicated that the cleared surface of the single crystal was of the a-b face, and that the single crystal had a single phase without any undergrowth with 7K and 85K phases. In addition, although the figure is not shown, XRD patterns from (006) to (00□) were observed in the range of 2θ=0 to 60 degrees. The characterization of as-grown single crystals have been analyzed by Laue X-ray backsdattering along the c-axis and X-ray precession experiments. The result of magnetic moment vs Tc in 10 Gauss for a crystals were measurements indicated that the samples have a superconducting transition temperature of 85K.

고온가열 살균처리가 굴 통조림의 품질 특성에 미치는 영향

공청식,강수태,김종태,오광수 경상대학교 해양산업연구소 2002 해양산업연구소보 Vol.15 No.-

보다 품질이 우수한 굴 통조림을 제조하기 위한 기초 자료를 제시할 목적으로, 원료 굴을 자숙한 후 301-3관에 충전, 밀봉하여 115℃에서 Fo값이 5~2O 되도록 가열살균처리를 하였으며 이같은 가열살균처리가 내용물의 물리적, 이화학적 성분의 변화 및 관능적 변화 등과 같은 굴 통조림의 전반적인 품질에 미치는 영향에 대하여 검토하였다. 제품의 수율은 Fo값이 증가할수록 약간씩 감소하였고, 수율은 79.2~83.7% 정도였다 가열처리중 시료 굴 통조림의 pH는 별 변화를 보이지 않았고, 휘발성 염기질소는 원료 굴의 육 성분이 분해되어 휘발성 염기성분이 생성됨에 따라 열처리정도에 따라 상당량 증가하였다. 원료 굴의 주요 구성지방산은 14:0, 16:0, 18:In9, 20:5n3 및 22:6n3 으로서, 고온가열처리를 많이 받을수록 포화 및 모노엔산의 조성비는 약간씩 증가한 반면 플리엔산은 약간씩 감소하였다. 고도불포화지방산의 잔존율 역시 Fo값이 증가할수륵 상당히 감소하는 경향을 보였다. 시료 굴 통조림의 정미성분 중 유리아미노 산류는 자숙 및 가압 살균시 수분이 유출됨에 따라 처음에는 상당량 감소하였으나, 이후 열처리가 진행될수록 약간씩 증가하였다. Tau의 경우는 Fo값이 증가할수록 계속 감소하였다. Betaine은 생굴에 400.6 mg/100g으로 다량 함유되어 있었으며, 고온가열처리 중 상당량 감소하였다. 엑스분 중의 주요 무기이온성분은 Na, K, Mg 및 P 이었으며, 이들은 고온가열처리 중 Fo값이 증가할수록 상당량 감소하여 Fo 20 시료의 경우 대부분 무기이온성분들이 생굴에 비해 1/3 정도로 감소하였다. 조직감면에서는 고온에서의 열처리로 인한 조직의 연화보다는 가압에 따른 수분의 유출과 압착으로 인해 조직이 단단해지는 것으로 나타났다. 가열처리에 따른 굴 통조림의 관능적 특성의 변화에서 색조는 Fo값이 증가할수록 약간씩 갈변화되었고, 냄새는 가열처리를 많이 받을수록 대체로 좋은 평가를 받았다. 맛과 조직감은 가열처리의 정도에 따른 차이를 인지할 수 없었으며, 종합평가면에서 Fo 5~15시료간에는 유의적 차이가 인정되지 않았다. The boiled-oyster vacuum-packed in cylindrical can(No. 303-3) were thermally processed at 115℃ to reach Fo values of 5~20 min changes in food components and sensory evaluation of canned oyster by thermal processing at high temperature were investigated. The moisture contents of canned oyster meat decreased with the increasing of Fo values at 115℃, while crude protein contents relatively increased. The yield was slightly decreased with the increasing of Fo values(79.2 ~83.7% degrees), and volatile basic nitrogen(VBN) contents increased markedly with the increasing of Fo value. In fatty acid composition of canned oyster, the composition ratio of saturates and monoenes such as 14:0, 16:0 and 18:In9 increased, while polyunsaturated fatty acids such as 20:5n3 and 22:6n3 decreased with the increasing of Fo value. In taste compounds, content of total free amino acid in raw oyster was 1,533.5 mg%, and this total content was slightly increase(1,140.8 mg%~l,266.2 mg% degrees) with the increasing of Fo values. The major free amino acids of canned oyster were Tau, Glu, Asp, Ala and Cys. But contents of betaine and ionic minerals such as Na, K, Mg and P decreased markedly by thermal processing at l15℃. As compared with Fo 5 min heat treatment; Fo 20 min heat treatment at 115'c became more hardened in texture of oyster meat. In sensory evaluations on organoleptic characteristics, no significant difference was observed among the canned oyster heated at Fo 5, 10 and 15 min.

연속회분식공법을 이용한 염색폐수처리

김무식,최충식,이오석,전장표 대구보건대학 2002 대구보건대학 論文集 Vol.22 No.-

We investigated the basic operation conditions and biological properties for the dyeing wastewater treatment by sequencing batch reactor(SBR) process. The results are summarized as bellow. The experimental results were constructed with design factor. a. COD removal efficiency was appeared to be over 53% when carbohydrate not added to dyeing wastewater. According to carbohydrate addition weight COD removal efficiency was improved to 92%. b. TKN removal efficiency was appeared to be over 43% when carbohydrate not added to dyeing wastewater. When carbohydrate added to dyeing waste water TKN removal efficiency was achieved 87%. In a conclusion, therefore, under all the conditions provided in this study Sequencing Batch Reactor process appeared to be effective, economical and useful process for dyeing wastewater treatment.

Bi₁₂SiO? 단결정의 탄성광학적 특성

이수대,설정식,오상범 慶南大學校 附設 基礎科學硏究所 1991 硏究論文集 Vol.3 No.-

We measured the thermal expansion coefficient, the variation of refractivity and the stress-optical coefficient of the Bi₁₂SiO?? single crystal by the Mach-Zehnder interferometer. The thermal expansion coefficient of the Bi₁₂SiO? single crystal was 9×10?? /℃ at the near room temperature and 1×10?? /℃ at the near 200℃. The refractivity of the Bi₁₂SiO?? single crystal that was measured from the Brewster angle at the room temperature was 2.540. The stress optical coefficient q₁₃ was 6.6×10?? m²/N at the room temperature.

Comparison of survival of surgical resection and conservative treatment in patients with gastric cancer aged 80 years or older

Chung-Sik Gong,Jeong-Hwan Yook,Sung-Tae Oh,Byung-Sik Kim 대한외과학회 2016 Annals of Surgical Treatment and Research(ASRT) Vol.91 No.5

Purpose: With the increase in the average life expectancy, the elderly population continues to increase rapidly. However, no consensus has been reached on the feasibility for surgical resection due to the high morbidity and mortality rate after surgical treatment in elderly patients caused by aging and underlying diseases. Methods: This study was performed with patients aged 80 years and older. The subjects were classified into 2 groups as follows: the surgical resection group consisting of 61 patients, and the conservative treatment group consisting of 39 patients suitable for curative resection. Results: Mean age and clinical stages in the conservative treatment group were higher than those in the surgical resection group. There was no significant difference in sex, location of the lesion, histological type, or underlying disease. The mean survival time of surgical resection group and conservative treatment group was respectively 52.1 ± 2.66 months and 37.1 ± 5.08 months (P < 0.05) for clinical stage 1 disease, 41.7 ± 5.16 months and 22.4 ± 6.07 months (P = 0.004) for stage 2 disease, and 31.7 ± 9.37 months and 10.6 ± 1.80 months (P = 0.049) for stage 3 disease. However, as for the extent of lymph node resection for the different stages, we observed no significant difference between the 2 groups. Conclusion: Surgical resection in all clinical stages, except stage 4, showed a higher survival rate than conservative treatment. To minimize postoperative surgery complications, limited lymph node dissection should also be considered.

Effect of Equipotent Doses of Propofol versus Sevoflurane Anesthesia on Regulatory T Cells after Breast Cancer Surgery

Oh, Chung-Sik,Lee, Jaemoon,Yoon, Tae-Gyoon,Seo, Eun-Hye,Park, Hyun-Jun,Piao, Liyun,Lee, Seung-Hyun,Kim, Seong-Hyop Lippincott Williams & Wilkins 2018 Anesthesiology Vol.129 No.5

<P>Conclusions: Changes in immune cells were similar with propofol and sevoflurane during breast cancer surgery. The effect of anesthetics on the perioperative immune activity may be minimal during cancer surgery.</P>

Postoperative Delirium in Elderly Patients Undergoing Hip Fracture Surgery in the Sugammadex Era: A Retrospective Study

Oh, Chung-Sik,Rhee, Ka Young,Yoon, Tae-Gyoon,Woo, Nam-Sik,Hong, Seung Wan,Kim, Seong-Hyop Hindawi Publishing Corporation 2016 BioMed research international Vol.2016 No.-

<P><I>Background.</I> Residual neuromuscular block (NMB) after general anesthesia has been associated with pulmonary dysfunction and hypoxia, which are both associated with postoperative delirium (POD). We evaluated the effects of sugammadex on POD in elderly patients who underwent hip fracture surgery.<I> Methods.</I> Medical records of 174 consecutive patients who underwent hip fracture surgery with general anesthesia were reviewed retrospectively to compare the perioperative incidence of POD, pulmonary complications, time to extubation, incidence of hypoxia, and laboratory findings between patients treated with sugammadex and those treated with a conventional cholinesterase inhibitor.<I> Results.</I> The incidence of POD was not significantly different between the two groups (33.3% versus 36.5%, resp.; <I>P</I> = 0.750). Postoperative pulmonary complications and laboratory findings did not showed significant intergroup difference. However, time to extubation (6 ± 3 versus 8 ± 3 min; <I>P</I> < 0.001) and the frequency of postoperative hypoxia were significantly lower (23% versus 43%; <I>P</I> = 0.010) in the sugammadex group than in the conventional cholinesterase inhibitor group.<I> Conclusion.</I> Sugammadex did not reduce POD or pulmonary complications compared to conventional cholinesterase inhibitors, despite reducing time to extubation and postoperative hypoxia in elderly patients who underwent hip fracture surgery under general anesthesia.</P>

Assessment of coagulation with 6% hydroxyethyl starch 130/0.4 in cesarean section

Chung-Sik Oh,성태윤,김성협,Duk Kyung Kim,임정애,우남식 대한마취통증의학회 2012 Korean Journal of Anesthesiology Vol.62 No.4

Background: Third-generation hydroxyethyl starch (HES) solutions have been developed to minimize negative effects on hemostasis. In normal pregnancy, the coagulation activity increases, reaching a maximum around term. This study examined the effects of hemodilution with HES 130/0.4 (6%) on blood coagulation in parturients in vivo and in vitro. Methods: Forty parturients scheduled for cesarean sections were assigned randomly to receive either 500 or 1,000 ml of HES 130/0.4 (6%). Rotation thromboelastometry (ROTEMⓇ) measurements were performed before and after administering HES 130/0.4 (6%). In addition, blood samples obtained from 20 randomly selected parturients were diluted 10% to 40% using HES 130/0.4 (6%), and ROTEMⓇ measurements were performed before and after dilution. The changes from baseline and the effects of dilution were analyzed by ROTEMⓇ parameters. Results: Infusions of 500 or 1,000 ml of HES 130/0.4 (6%) in the parturients altered the clot formation time, α angle, and maximal clot firmness, although all remained within normal ranges. HES 130/0.4 (6%) affected in vitro blood coagulation in parturients’ blood containing 10, 20, 30, and 40% HES. The clotting time was prolonged at each dilution percentage, but remained within the normal range. Other parameters showed an impairment of the coagulation system. Conclusions: Blood coagulation in parturients may be compromised at high dilution ratios of HES 130/0.4 (6%) to blood. Nevertheless, the infusion of 1,000 ml of HES 130/0.4 (6%) in normal parturients did not significantly affect blood coagulation.

한일상관기의 잔차 지연 보정 알고리즘의 개선

Oh, Se-Jin,Yeom, Jae-Hwan,Roh, Duk-Gyoo,Oh, Chung-Sik,Jung, Jin-Seung,Chung, Dong-Kyu,Oyama, Tomoaki,Kawaguchi, Noriyuki,Kobayashi, Hideyuki,Kawakami, Kazuyuki,Ozeki, Kensuke,Onuki, Hirohumi 한국융합신호처리학회 2013 융합신호처리학회 논문지 (JISPS) Vol.14 No.2

본 논문에서는 FX 형식의 한일상관기(Korea-Japan Joint VLBI Correlator, KJJVC)의 잔차 지연 보정 알고리즘을 제안하였다. KJJVC의 초기 잔차 지연보정 알고리즘에는 연산의 고속화를 위해 정수 연산과 위상보정 계수를 위한 cos/sin table을 도입하였다. 그리고 잔차 지연 알고리즘의 초기설계에서 데이터의 타이밍과 잔차 지연 위상의 불일치와 비트쉬프트와 잔차 지연 위상의 불일치 문제를 해결하였다. VCS의 잔차 지연 알고리즘의 최종 설계에서는 잔차 지연보정된 값을 FFT segment에 적용할 때 잔차 지연 보정 회전 메모리가 초기화 되지 않는 것을 수정하였다. 제안한 잔치 지연 보정 알고리즘을 이용하여, 교차 전력 스펙트럼의 대역폭 모양이 모든 대역폭에 대해서 손실이 없이 평탄한 것을 확인하였다. 제안한 잔차 지연보정 알고리즘의 유효성을 확인하기 위해 시뮬레이터와 KJJVC를 이용하여 실제 관측데이터를 대상으로 상관처리 시험을 수행하였다. 실험결과를 통하여 제안한 잔차 지연 보정 알고리즘이 KJJVC에 잘 적용되고 있으며, 신호대 잡음비가 약 8% 향상되는 것을 확인하였다. In this paper, the residual delay compensation algorithm is proposed for FX-type KJJVC. In case of initial version as that design algorithm of KJJVC, the integer calculation and the cos/sin table for the phase compensation coefficient were introduced in order to speed up of calculation. The mismatch between data timing and residual delay phase and also between bit-jump and residual delay phase were found and fixed. In final design of KJJVC residual delay compensation algorithm, the initialization problem on the rotation memory of residual delay compensation was found when the residual delay compensated value was applied to FFT-segment, and this problem is also fixed by modifying the FPGA code. Using the proposed residual delay compensation algorithm, the band shape of cross power spectrum becomes flat, which means there is no significant loss over the whole bandwidth. To verify the effectiveness of proposed residual delay compensation algorithm, we conducted the correlation experiments for real observation data using the simulator and KJJVC. We confirmed that the designed residual delay compensation algorithm is well applied in KJJVC, and the signal to noise ratio increases by about 8%.