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기계적 혼합과 고상법에 의한 LiNiO<sub>2</sub>의 합성과 전기화학적 특성
김훈욱,윤순도,이재천,박혜령,송명엽,Kim, Hunuk,Youn, SunDo,Lee, Jaecheon,Park, HyeRyoung,Song, Myoungyaup 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.5
[ $LiNiO_2$ ] was synthesized by the solid-state method after mixing $LiOH{\cdot}H_2O$ and $Ni(OH)_2$ with SPEX mill. The optimum condition for the synthesis of $LiNiO_2$ was the calcination at $750^{\circ}C$ for 30h in $O_2$ stream after milling for 1 h. The $LiNiO_2$ synthesized under this condition showed relatively large value of $I_{003}/I_{104}$ and relatively small value of R-factor. When $LiNiO_2$ was cycled in 2.7$\~$4.15 V at 0.1C-rate, the first discharge capacity was not very large (145.8 mAh/g) but it showed good cycling performance. When $LiNiO_2$ was cycled in 2.7$\~$4.2 V at 0.1C-rate, the first discharge capacity was large but ,it showed poor cycling performance probably because of the transition of H2 hexagonal structure to H3 hexagonal structure. In addition, when $LiNiO_2$ was cycled in 1.0$\~$4.8 V at 1/24C- rate, the first discharge capacity was very large (257.7 mAh/g) and the discharge capacity increased with the number of cycles.
기계적 혼합과 고상법에 의해 합성한 LiNi<sub>1-y</sub>Ga<sub>y</sub>O<sub>2</sub>의 전기화학적 특성
김훈욱,윤순도,이재천,박혜령,박찬기,송명엽,Kim, HunUk,Youn, SunDo,Lee, JaeCheon,Park, HyeRyoung,Park, Chan-Gi,Song, MyoungYoup 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.9
$LiNi_{1-y}Ga_yO_2$ (y = 0.005, 0.010, 0.025, 0.050, and 0.100) were synthesized by the solid-state reaction method after mechanical mixing, and their_electrochemical properties were investigated. All the $LiNi_{1-y}Ga_yO_2$ (y=0.005, 0.010, 0.025, 0.050, and 0.100) samples had the R3m structure. The sample with y = 0.025 showed the largest first discharge capacity (131.4 mAh/g) and good cycling performance [discharge capacity 117.5 mAh/g ($89.4{\%}$ of the first discharge capacity) at the 20th cycle]. The first discharge capacity decreased as the value of y increased. The samples with y = 0.010 and y = 0.005 had small R-factor but their cycling performance was worse than that of the sample with y = 0.025. All the $LiNi_{1-y}Ga_yO_2$ samples had smaller discharge capacities than $LiNiO_2$, but their cycling performances were better than that of $LiNiO_2$.
김훈욱,윤순도,이재천,박혜령,송명엽,Kim, Hunuk,Youn, SunDo,Lee, Jaecheon,Park, HyeRyoung,Song, Myoungyoup 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.5
By calcining at $750^{\circ}C$ for 30 h in $O_2$ stream after milling, $LiNi_{1-y}M_yO_2(M=Zn^{2+},\;Al^{3+}$, and $Ti^{4+}$, y = 0.005, 0.01, 0.025, 0.05, and 0.1) were synthesized and their electrochemical properties were investigated. All the samples had R3m structure. $LiNi_{1-y}Zn_yO_2$ (y = 0.025, 0.05, and 0.1) contained ZnO anuor $Li_2ZnO_2$ as impurities. Among the samples substituted with the same element, the samples with relatively large value of $I_{003}/I_{104}$ and the smallest R-factor had the largest first discharge capacity and good cycling performance. $LiNi_{0.975}A1_{0.025}O_2$ had the largest first discharge capacity (172.5 mAh/g) and good cycling performance (about $89.4\%$ of the first discharge capacity at the 20th cycle). This sample had the largest value of $I_{003}/I_{104}$ and the smallest R-factor among all the samples. In addition, the particles of this sample were finer and their size was more homogeneous than the other samples. $LiNi_{0.95}A1_{0.05}O_2$ had relatively large first discharge capacity 150.4 mAh/g and good cycling performance.
페놀류인 4-isopropylphenol의 선택적 분리를 위한 키토산 기반 바이오 소재 제조와 흡력 성능 평가
윤현기 ( Hyun-gi Youn ),김은식 ( Eun-sik Kim ),윤순도 ( Soon-do Yoon ) 한국키틴키토산학회 2018 한국키틴키토산학회지 Vol.23 No.2
The main objectives of this work are to prepare the chitosan(CH)/PVA biomaterials for the selective separation of 4- isopropylphenol (4IPP) as a phenolic. In order to improve the selective separation, CH/PVA biomaterials was also synthesized using benzoic acid (BA) or p-toluic acid (pTA) which have a similar structure with 4IPP as the target material. The CH/PVA biomaterials were prepared by casting method and UV irradiation process. Physical properties such as tensile strength (TS), elongation at break (%E), swelling behavior (SB), and solubility (S) for prepared biomaterials were investigated. The adsorption properties were evaluated by the adsorption kinetics, binding isotherm, Scatchard plot analysis, adsorption of materials with structures similar to target molecules, and selectivity factor (α). The results of the evaluation indicate that the prepared CH/PVA biomaterials have high separation abilities and selectivity.
지황 추출물 첨가 chitosan 기반 기능성 바이오 소재 제조 및 응용
이시연,김경중,김윤섭,윤순도,Lee, Si-Yeon,Kim, Kyeong-Jung,Kim, Youn-Sop,Yoon, Soon-Do 한국공업화학회 2022 공업화학 Vol.33 No.2
The main objective of this work is to prepare Rehmannia glutinosa extract (RE) incorporated functional chitosan (CH) based biomaterials and evaluate their physical properties, RE release properties, inhibitory effect of melanogenesis, and antioxidant and elastase inhibitory activities. RE incorporated CH based biomaterials were synthesized by a casting method and UV curing process. The surface and cross sections of prepared biomaterials were characterized by a field emission scanning electron microscope (FE-SEM). The physical properties such as tensile strength and elongation at break were also investigated. To apply the transdermal drug delivery system, RE release properties were examined with pH 4.5, 5.5, and 6.5 buffer solutions and artificial skin test at 36.5 ℃. Results indicated that RE release of RE incorporated biomaterials with/without the addition of plasticizers [glycerol (GL) and citric acid (CA)] at pH 6.5 was about 1.10 times higher than that of at pH 4.5. In addition, results of the artificial skin test verified that RE was released constantly for 6 h. To verify the applicability of the prepared biomaterials, tyrosinase, 2,2-diphenyl-1-picrylhydrazyl (DPPH), and elastase assays were investigated. Results indicated that RE incorporated biomaterials added CA exhibited tyrosinase activation, DPPH radical scavenging activity rate, and elastase activation of 45.12, 89.40, and 59.94%, respectively.
산림화재 진화의 효율화를 위한 제도개선 방안에 관한 연구
최규출(Choi, Kyu-Chool),윤순만(Youn, Soon-Man) 한국화재소방학회 2008 한국화재소방학회 학술대회 논문집 Vol.2008 No.추계
우리나라에서는 산림화재가 발생하면 산림청이 주관하여 지방자치단체와 산림청 지방기관의 직원들을 동원하여 통합진압대를 구성하여 산불진화활동에 나선다. 이 때 산림청은 산불진화에 있어 통합지휘권을 갖고 산불현장에 출동한 지자체 소속 공무원이나 산불감시요원 및 각종 진압요원, 출동한 소방공무원 등을 현장 지휘하는 구조로 운영되고 있다. 경기도 양평군에서 최근 5년 동안 발생했던 산불을 추적하여 산불의 발생에서 진압까지전 과정을 분석하였다. 일선에서 산불이 발생하면 주민들은 일상적으로 소방관서에 신고하고 있으며, 신고를 접한 소방관서는 즉각 출동하여 진화하고 마지막 잔불정리까지를 소방관서가 담당하고 있다. 소방관서에는 산불진화를 위한 예산지원이나 인력지원은 전무한 상태의 구조로 되어 있는 현재의 산불진화체계는 여러 문제점으로 인하여 산불의 효율적인 진화가 어렵고, 산불 발생 시 산불확대로 피해를 키우고 있다는 지적을 받고 있다. 이러한 산불진화체계의 제도적인 문제점을 파악하고 개선하여 산불진화의 최적화를 위한 개선책을 제시한다.
십이지장 궤양 출혈의 내시경 지혈술 후 발견된 분리췌장
최용혁 ( Yong Hyeok Choi ),윤순만 ( Soon Man Yoon ),김은비 ( Eun Bee Kim ),오영민 ( Youngmin Oh ),김근모 ( Keunmo Kim ),이지선 ( Jisun Lee ),박선미 ( Seon Mee Park ),윤세진 ( Sei Jin Youn ) 대한소화기학회 2017 대한소화기학회지 Vol.69 No.4
Peptic ulcer bleeding is treated using endoscopic hemostasis using clips or bands. Pancreas divisum (PD), a congenital anomaly of the pancreas, usually has no clinical symptoms; however, pancreatitis may occur if there are disturbances in the drainage of pancreatic secretions. We report an unusual case of PD accompanied by acute pancreatitis, following endoscopic band ligation for duodenal ulcer bleeding. A 48-year-old woman was admitted to our hospital due to melena. An upper endoscopy revealed a small ulcer with oozing adjacent minor papilla. An endoscopic band ligation was performed on this lesion. Acute pancreatitis developed suddenly 6 hours after the band ligation and improved dramatically after removal of the band. Magnetic resonance cholangiopancreatography was performed, revealing complete PD. Endoscopic band ligation is known as the effective method for peptic ulcer bleeding; however, it should be used carefully in duodenal ulcer bleeding near the minor duodenal papilla due to the possibility of PD. (Korean J Gastroenterol 2017;69:248-252)
팽대부 선근종의 임상적, 병리학적, 면역조직화학염색의 특징
최용혁 ( Yong Hyeok Choi ),김미진 ( Mi Jin Kim ),한정호 ( Joung Ho Han ),윤순만 ( Soon Man Yoon ),채희복 ( Hee Bok Chae ),윤세진 ( Sei Jin Youn ),강민호 ( Min Ho Kang ),성노현 ( Rohyun Sung ),최재운 ( Jae Woon Choi ),박선미 ( Seon 대한소화기학회 2013 대한소화기학회지 Vol.62 No.6
Background/Aims: Ampullary adenomyoma is a benign lesion whose malignant potential has yet to be confirmed. Despite its benign nature, adenomyoma is frequently misdiagnosed as a carcinoma or adenoma and is overtreated by extensive surgery. This study was performed to analyze the clinical, pathological, and immunohistochemical features of adenomyomas in the ampulla of Vater. Methods: Nine cases of adenomyoma in the ampulla of Vater, diagnosed in Chungbuk National University Hospital between 2008 and 2011, were enrolled in this study. We reviewed the clinical data on the symptoms, laboratory data, and radiologic findings of the abdominal computed tomography and endoscopic retrograde cholangiopancreatography. For pathological analysis, all the slides were reviewed by one pathologist, and immunohistochemical stainings with antibodies against cytokeratin 7 (CK7), cytokeratin 20 (CK20), α-smooth muscle actin (α-SMA), and Ki-67 antigen were performed. Results: All the cases were CK7 positive and CK20 negative. A strong cytoplasmic expression of α-SMA was confirmed in all cases. The Ki-67 index was less than 1% in eight cases and 5% in one case. Four cases underwent endoscopic papillectomy, and one case received surgical ampullectomy during colorectal cancer surgery. Five cases that underwent endoscopic or surgical treatment remained symptom-free for three years. Four cases that were closely observed with repeated endoscopic examinations exhibited no interval changes in the papillary lesions. Conclusions: Endoscopic biopsy and immunohistochemistry can aid in the diagnosis of ampullary adenomyomas. Endoscopic papillectomy or surgical ampullectomy is adequate for the treatment of symptomatic ampullary adenomyomas. (Korean J Gastroenterol 2013;62:352-358)
다중검출 전산화단층촬영에서 담석이 보이지 않는 급성 담석성 췌장염에서 조기 내시경초음파검사의 유용성
박재근 ( Jae Geun Park ),김기배 ( Ki Bae Kim ),한정호 ( Joung-ho Han ),윤순만 ( Soon Man Yoon ),채희복 ( Hee Bok Chae ),윤세진 ( Sei Jin Youn ),박선미 ( Seon Mee Park ) 대한소화기학회 2016 대한소화기학회지 Vol.68 No.4
Background/Aims: EUS can detect bile duct stones (BDS) that are undetectable on multidetector computed tomography (MDCT). BDS associated with acute biliary pancreatitis (ABP) are small and tend to be excreted spontaneously. This study evaluated the usefulness of early EUS in patients with ABP and undetectable BDS on MDCT. Methods: Forty-one patients with ABP and undetectable BDS on MDCT underwent EUS within 24 hours of admission and were diagnosed with BDS, sludge, dilated common bile duct (CBD), or normal CBD. ERCP was performed in patients with BDS, sludge, or clinical deterioration. The diagnostic yield and the effects of early EUS on morbidity, mortality, and the length of hospitalization were evaluated. Results: EUS detected BDS or sludge in 48.8% of patients examined. BDS was the diagnosis in 13 patients, sludge in seven, and neither for 21 patients. ERCP was performed in 20 patients with BDS or sludge, in two patients with coexisting cholangitis, and in one patient with worsening liver function tests. ERCP identified BDS in 12 patients and sludge in seven. No lesions were diagnosed in four patients by ERCP. All patients improved, and the length of hospitalization in patients with ERCP was 9.0 days, without ERCP 7.1 days. Two patients with major complications by ERCP were hospitalized for a prolonged time. Conclusions: Early EUS may be useful to select patients for therapeutic ERCP in cases of suspected ABP with undetectable BDS on MDCT. (Korean J Gastroenterol 2016;68:202-209)
종양과 연관되어 발생한 근병증 2예 요약제목: 종양관련 근병증 2예
이효덕 ( Hyo Deok Lee ),김미진 ( Mee Jin Kim ),서의근 ( Eui Geun Seo ),채희복 ( Hee Bok Chae ),한정호 ( Joung Ho Han ),윤순만 ( Soon Man Yoon ),박선미 ( Seon Mee Park ),윤세진 ( Sei Jin Youn ),김대곤 ( Dae Ghon Kim ) 전북대학교 의과학연구소 2012 全北醫大論文集 Vol.36 No.1
저자들은 근병증 2예와 병발한 악성 종양을 경험하였으며, 향후 원인 미상의 간 효소 수치 상승을 가진 환자가 피부 병변과 근력 약화를 호소하는 경우 꼭 근육염 가능성을 염두에 두어야 한다는 교훈을 얻을 수 있었다. 아울러 이러한 환자에서 근육염 확진을 위한 근육 생검, 근염 특이 자가 항체 검사 등을 통해서 IIM으로 진단될 경우 종양의 동반유무를 찾기 위한 종양표지자 및 영상 검사와 함께 PET 등의 첨단 검사도 이용될 필요가 있다는 것을 저자들은 본 2예의 증 례보고를 통해서 주장하는 바이다. 감사의 글 본 증례 환자들의 치료 과정을 함께 해 주시고, 원고를 검토해주신 류마티스 내과 강귀영 교수님께 진심으로 감사 드립니다. It is assumed that malignancy is a part of a clinical course in patients with idiopathic inflammatory myopathy (IIM), as the cancer occurrence in the group have been frequently reported. This paper discusses two cases of IIM associated with cancer either simultaneously or sequentially. The first patient who had diagnosed with colon cancer two weeks prior to the admission presented with polymyositis (PM). The second patient with breast cancer presented dermatomyositis (DM). Both patients were admitted to the hepatology unit because their initial presentation was abnormal liver enzyme levels with muscle weakness. IIM patients can be misdiagnosed as acute hepatitis because of the initial feature. This paper reports two cases of IIM with malignancy.