Microwave Absorption Characteristics of U-Type Ferrite Powders According to Substitution Elements and Its Compositions

Kwang‑Pil Jeong,Su‑Won Yang,Jin‑Hyuk Choi,Jeong‑Gon Kim 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8

In this study, partially substituted U-type ferrite (Ba4MexCo2-xFe36O60, Me: Mn, Ni, Zn, x=0.5 and 1.0) powders weresynthesized by sol–gel method. The powders were analyzed for phase formation, morphology and magnetic properties byXRD, FE-SEM and VSM respectively. The synthesized ferrite powders were pressed into a series of toroidal shaped samples,in which the weight ratio of parafn to powder was 1:5. The complex scattering parameters were measured by using vectornetwork analyzer in the frequency range of 2–18 GHz and were employed in the calculation of refection loss with variousthicknesses. The minimum refection loss was observed in the substituted nickel sample as−24.4 dB (absorption rate 99.6%)with a thickness of 2.5 mm and the bandwidth was achieved 4.8 GHz (from 7.5 to 12.3 GHz) for refection loss≤ −10 dBin the substituted zinc sample.

류마티스 관절염과 동반된 궤양성 대장염 1예

정종필,김윤아,서강석,김태현,김춘호,박정복,이광욱 朝鮮大學校 附設 醫學硏究所 2005 The Medical Journal of Chosun University Vol.30 No.2

The gastrointestinal involvement in rheumatoid arthritis may be broad and includes many causes: drug induced colitis, colitis associated with infectious agents, vasculitis in gut, autoimmune disease located in gut. Rheumatoid arthritis is a chronic multisystemic disease of unknown cause. Although a number of mixed autoimmue disease exist, there were rare reports about Ulcerative colitis with Rheumatoid arthritis associated. We report one case of Rheumatoid arthritis patient who diagnosed as Ucerative colitis by colonoscopic and histologic finding with review of literature.

'1998 한국인 우울증 선별의 날' 참가자들의 사회인구통계학적 특성과 우울증 선별검사 결과

한상익,이성필,고효진,박원명,장계호,유태열,전태연,채정호,방승규,김광수,최보문,이정태,백인호 大韓神經精神醫學會 1999 신경정신의학 Vol.38 No.5

연구목적 : 1998년 정신건강의 날 기념 한국인 우울증 선별의 날 행사에 자발적으로 참여한 참가자들의 사회인구 통계학적 특성을 분석하고 우울증 선별검사 결과를 평가하기 위하여 본 연구를 시행하였다. 방 법 : 8개 병원에서 얻어진 619명의 자료를 사용하여 선별검사로 밝혀진 우울증의 유병율과 사회인구통계학적 특성 및 응답자의 정신과적 치료를 포함한 과거력 등을 조사하였다. 결 과 : 우울증 척도 점수는 응답자 전체 평균 57.5±13.8로 경도의 우울 증상이 있는 것에 해당되었다. 전체 응답자의 69.5%(430명)가 최소한 경도 이상의 우울 증상을, 43.1%(267명)가 중등도 이상의 우울 증상을, 18.4%(114명)가 고도의 우울 증상을 보였다. 고도의 우울 증상이 있는 응답자의 56.8%와 중등도의 우울 증상이 있는 응답자의 63.9%가 정신과 치료를 받은 적이 전혀 없었다. 나이가 29세 이하인 것과 전임근무 중인 직업상태는 각각 나이가 60세 이상인 것과 직업이 없는 것에 비교하여 우울증으로부터 보호하는 인자임을 시사하였다. 결 론 : '1998 한국인 우울증 선별의 날' 행사를 통하여 많은 우울증 환자들을 선별해낼 수 있었고, 이들의 우울 증상은 몇몇 사회인구통계학적 특성과 유의한 관계가 있음을 확인하였다. 우울증 선별의 날 행사를 통한 우울증에 대한 교육과 우울증 선별검사는 치료받지 못하고 있는 우울증 환자 및 기존의 치료 중인 환자 모두에게 유용한 프로그램임을 알 수 있었다. Objectives : This study was performed to analyze the sociodemographic characteristics of participants in '1998 Korean Depression Screening Day' and to evaluate the results of the screening test. Methods : By using the survey results of 619 volunteers from 8 hospitals, the authors examined the prevalence of depression detected at the screening test and sociodemographic characteristics and the psychiatric treatment history of respondents. The assessment measure was the Zung Self-Rating Depression Scale. Results : The mean depression score of all participants was 57.5±13.8 and it came under mild depression. Of all participants, 69.5%(N=430) had at least mild depressive symptoms, 43.1%(N=267) had at least moderate symptoms, and 18.4%(N=114) had severe symptoms. Never have 56.8% of respondents in the severely depressed range and 63.9% of those in the moderately depressed range had psychiatric treatment. The results suggest that the age group of 29-year-old or younger(relative to 60-year-old or older group) and full-time employment status(relative to unemployment) are protective factors of depression. Conclusions : By '1998 Korean Depression Screening Day', many depressed patients were detected and their depressive symptoms had statistically significant relationships with some sociodemographic characteristics. The results suggest that the education and screening test programs for depressive illness facilitated by Depression Screening Day are useful to the patients regardless of being under current treatment or not.

양측성 전정장애 환자들의 전정기능검사

이근호,김재일,정필섭,전범석,이광우 대한신경과학회 1996 대한신경과학회지 Vol.14 No.4

두경부에 발생한 지방종

나홍식,김웅식,팽재필,김혜정,정광윤,최건,최종욱 한국의학사 2000 診斷과治療 Vol.20 No.2

자궁근종 적출술에 있어서 미세절개개복술 ( Minilaparotomy ) 과 골반경수술과의 비교 고찰

정광필(Kwang Pil Jeong),오성택(Sung Tack Oh),박훈(Hoon Park) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.3

N/A Objective: This study investigates the safety and effectiveness of laparoscopic myomectomy by comparing with minilaparotomic myomectomy in terms of the operation time, hemorrhage, pain, complications and pregnancy rates after opration. Method: Total 56 patients who underwent myomectomy in Chonnam National University Hospital from January 1996 to December 2000 were included.26 subjects underwent minilaparotomy and 30 subjects laparoscopic myomectomy respectively. The number, size and place of uterine myoma, the operation time required, hemoglobin reduction, and operation indication were compared. The frequency of analgesics application, the period without analgesics injection, complications, and pregnancy rates after operation were investigated. Results: 1.The amount of hemorrhage and hemoglobin markedly decreased in laparoscopic myomectomy in comparison with minilaparotomy (P<0.01). 2.Analgesics were much less frequently used in laparoscopic myomectomy than minilaparotomy (P<0.01). Also Analgesics were injected for a significantly shorter period after laparoscopic myomectomy (P<0.01). 3.There was no significant difference in operation time, hospital period and complications rates between two groups. 4.Total 24 patients conceived after myomectomy.12 of them belonged to minilaparotomy patients group and 13 patients to laparoscopic myomectomy group.10 patients of the former and 11 of the latter were delivered of a baby through elective cesarean section and there was no significant difference. One to each group tried vaginal delivery, and there was no complication such as uterine rupture. Conclusion: Laparoscopic myomectomy is a safe and effective to treat uterine myoma and better than minilaparotomy in terms of post operative pain and hemoglobin.

Isoflavones from phytoestrogens and gastric cancer risk: a nested case-control study within the Korean Multicenter Cancer Cohort.

Ko, Kwang-Pil,Park, Sue K,Park, Boyoung,Yang, Jae Jeong,Cho, Lisa Y,Kang, Chungwon,Kim, Cheong Sik,Gwack, Jin,Shin, Aesun,Kim, Yeonju,Kim, Jeongseon,Yang, Han-Kwang,Kang, Daehee,Chang, Soung-Hoon,Shin American Association for Cancer Research 2010 Cancer Epidemiology, Biomarkers & Prevention Vol.19 No.5

<P>BACKGROUND: The role of soybean products in gastric cancer risk is not clear in epidemiologic studies due to measurement error from dietary intake questionnaires and due to different degrees of bias according to study design. To examine the association between soybean products and gastric cancer risk, we measured phytoestrogen biological markers in a nested case-control study. METHODS: The study population was composed of 131 cases and 393 matched controls within the Korean Multicenter Cancer Cohort. The concentrations of the four biomarkers in the plasma samples were measured using time-resolved fluoroimmunoassay. Conditional and unconditional logistic regression models were used to compute the odds ratio (OR) and 95% confidence intervals (CI). RESULTS: Median plasma concentrations of genistein (229 nmol/L for controls, 181.8 nmol/L for cases; P=0.07) and daidzein (131.2 nmol/L for controls, 80.5 nmol/L for cases; P=0.04) in cases were lower than in controls, whereas equol concentrations were similar. Compared with the reference group, gastric cancer risk decreased in the highest groups for genistein (OR, 0.54; 95% CI, 0.31-0.93) and daidzein (OR, 0.21; 95% CI, 0.08-0.58). Higher equol concentrations were associated with a decreased risk for gastric cancer (OR, 0.50; 95% CI, 0.27-0.90). The combination of the highest concentrations for each isoflavone category was associated with a 0.09-fold decreased risk for gastric cancer compared with the combination of the lowest concentrations for each category. There was no association between plasma lignan concentrations and gastric cancer. CONCLUSIONS: High serum concentrations of isoflavones were associated with a decreased risk for gastric cancer. IMPACT: These results suggest a beneficial effect of high soybean product intake for gastric cancer risk.</P>

조기분만 시 양막파열 유무에 따른 제대정맥혈장내 interleukin-6와 tumor necrosis factor-α 및 항산화능의 변화

정광필 ( Kwang Pil Jeong ),김윤하 ( Yoon Ha Kim ),김철홍 ( Cheol Hong Kim ),조문경 ( Moon Kyoung Cho ),김기민 ( Ki Min Kim ),김종운 ( Jong Woon Kim ),안봉환 ( Bong Whan Ahn ),양성렬 ( Sung Yeul Yang ),주은현 ( Eun Hyun Joo ),송태 대한산부인과학회 2007 Obstetrics & Gynecology Science Vol.50 No.2

목적: 양막파열이 없는 조기 분만과 만삭전 조기 양막파열 분만 시 제대정맥혈장내 interleukin-6 (IL-6)와 tumor necrosis factor-α(TNF-α) 및 항산화능과 항산화제를 측정하고 이들을 정상 만삭분만과 비교분석하여 병태생리에 어떤 역할을 하는 가 규명하고자 하였다. 연구방법: 양막파열이 없는 조기 분만 임부 30명 (조기분만군), 만삭전 조기 양막파열 임부 30명 (양막파열군) 및 정상만삭분만 임부 30명 (정상 대조군)에서 태아 분만 시 제대정맥혈을 채취하여 혈장을 얻었다. Enzyme-linked immuno-sorbent assay kit를 이용하여 IL-6와 TNF-α농도, thiobarbituric acid 반응을 이용하여 지질과산화물 농도, Cao 등의 방법으로 항산화능 (ORAC) 및 high performance liquid chromatography를 이용하여 항산화제를 측정하여 비교하였다. 결과: 1. 정상 대조군, 조기 분만군 및 양막파열군의 IL-6 농도는 각각 2.79±0.22 pg/ml, 2.84±0.19 pg/ml, 3.28±0.31 pg/ml으로, 양막파열군에서 조기 분만군과 정상대조군보다 각각 유의하게 높았다 (p<0.05, p<0.05). 2. 정상 대조군, 조기 분만군 및 양막 파열군의 TNF-α농도는 각각 1.40±0.25 pg/ml, 1.64±0.23 pg/ml, 2.30±0.27 pg/ml으로, 양막파열군에서 조기 분만군과 정상 대조군보다 각각 유의하게 높았다 (p<0.01, p<0.01). 3. 정상대조군, 조기 분만군 및 양막파열군의 지질과산화물 농도는 각각 2.24±0.24 nmol/mg protein, 2.54±0.32 nmol/mg protein, 2.78±0.27 nmol/mg protein으로 양막파열군에서 정상 대조군보다 유의하게 높았다 (p<0.01). 4. 정상대조군, 조기 분만군 및 양막파열군의 항산화능(ORAC)은 각각 1011328.5±85.96 U/ml, 967425.4±98.99 U/ml, 965165.8±91.20 U/ml로 조기 분만군과 양막파열군에서 정상대조군보다 각각 유의하게 낮았다 (p<0.05, p<0.05). 5. 정상대조군, 조기 분만군 및 양막파열군의 ascorbic acid의 농도는 각각 221.7±2.82 nmol/ml, 158.3±3.08 nmol/ml, 125.6±2.33 nmol/ml로 양막파열군에서 정상대조군보다 유의하게 낮았다 (p<0.01). 결론: 제태연령이 진행될수록 태반내 지질과산화물 생성은 감소하고 항산화능과 항산화제는 증가하였으며, 만삭전 조기 양막파열 시 자궁내 염증성 반응으로 제대혈액내 cytokine들과 지질과산화물이 증가하며 이에 따른 항산화능 감소가 만삭전 조기 양막파수의 병태생리에 중요한 인자로 관여할 것으로 사료된다. Objective: To compare interleukin-6 (IL-6), tumor necrosis factor-α(TNF-α), oxygen-radical absorbance capacity (ORAC), and antioxidant vitamin levels in the umbilical venous plasma of preterm labor with intact membranes (PTL) and preterm premature rupture of membrane (PPROM) with that of full term normal pregnancy (NP) and to evaluate their roles of pathophysiology in preterm labor and PPROM. Methods: Umbilical venous blood samples were collected from women with PTL (n=30), PPROM (n=30) and NP (n=30). IL-6 and TNF-α were measured by enzyme-linked immunosorbent assay. Lipid peroxide levels were measured by thiobarbituric acid reaction. The ORAC was mesured by Cao`s method. Antioxidant vitamin levels were measured by high performance liquid chromatography. Results: IL-6 and TNF-αlevels in the umbilical venous plasma of PPROM were significantly higher than that of PTL and NP (3.28±0.31 vs. 2.84±0.19 vs. 2.79±0.22 pg/ml, p<0.05), (2.30±0.27 vs. 1.64±0.23 vs. 1.40±0.25 pg/ml, p<0.01). Lipid peroxide levels in the umbilical venous plasma of PPROM were significantly higher than that of NP and PTL (2.78±0.27 vs. 2.54±0.32 vs. 2.24±0.24 nmol/mg protein, p<0.01). ORAC levels in the umbilical venous plasma of PTL and PPROM were significantly lower than that of NP (967425.4±98.99 vs. 965165.8±91.20 vs. 1011328.5±85.96 U/ml, p<0.05). Ascorbic acid levels in the umbilical venous plasma of PPROM were significantly lower than that of NP and PTL (125.6±2.33 vs. 158.3±3.08 vs. 221.7±2.82 nmol/ml, p<0.01). Conclusion: Increase in inflammatory cytokines (IL-6, TNF-α) and imbalance of increased lipid peroxidation and decreased antioxidant activity in umbilical venous blood may be involved in the pathophysiology of PPROM.

3-Caffeoyl, 4-dihydrocaffeoylquinic acid from Salicornia herbacea inhibits tumor cell invasion by regulating protein kinase C-δ-dependent matrix

( Yong Pil Hwang ),( Hyo Jeong Yun ),( Jae Ho Choi ),( Hyo Kon Chun ),( Young Chul Chung ),( Sang Kyum Kim ),( Bong Hee Kim ),( Kwang Il Kwon ),( Tae Cheon Jeong ),( Kwang Youl Lee ),( Hye Gwang Jeong 영남대학교 약품개발연구소 2011 영남대학교 약품개발연구소 연구업적집 Vol.21 No.-

Antioxidant Activities of Korean Rice Wine Concentrates

Jeong, Jae-Wook,Nam, Pil-Woo,Lee, Seung-Joo,Lee, Kwang-Geun American Chemical Society 2011 Journal of agricultural and food chemistry Vol.59 No.13

<P>The antioxidant activities of six Korean rice wine (KRW) concentrates were measured by 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity and lipid/malonaldehyde (MA) assays. In the DPPH assay, the antioxidant activities of the KRW concentrates, including <I>Maesilju</I> (MSJ), <I>Kookhwaju</I>-1 (KHJ-1), <I>Kookhwaju</I>-2 (KHJ-2), <I>Gugijaju</I> (GGJ), <I>Sasamju</I> (SSJ), and <I>Sogokju</I> (SGJ), were 40%, 66%, 64%, 35%, 35%, and 63%, respectively. Furthermore, the concentrates inhibited the formation of MA from cod liver oil by 49%, 83%, 75%, 82%, 89%, and 90%, respectively, according to the lipid/MA assay. The sample wines were also analyzed for pH, titratable acidity, soluble solids (°Bx), and reducing sugars. The antioxidant activities of volatile extracts of the KRWs extracted by a solvent assisted flavor evaporation (SAFE) apparatus were evaluated by aldehyde/carboxylic acid assay. The volatile extracts of MSJ, KHJ-1, KHJ-2, GGJ, SSJ, and SGJ inhibited the oxidation of hexanal by 97%, 99%, 90%, 90%, 50%, and 51%, respectively. Among the nonvolatile extracts of KRWs, KHJ-2 showed the highest inhibitory effect on MA formation.</P>