Ni_(1-x)Zn_xFeAlo_4 Ferrite계의 Mo¨ssbauer 효과 연구

황진철,윤인섭,이철세 동국대학교 대학원 1993 東院論集 Vol.6 No.-

The Mo¨ssbauer effect of the Ni_(1-x)Zn_xFeAIO_4 ferrite system with x varying between 0.0 and 1.0, prepared by a ceramic sintering method, were investigated in the room temperature. By the X-ray diffractometry, all the samples regardless of x were found to be the single phase spinel structure only and the lattice constants were in the range of 8.143Å-8.382Å. The shapes of the Mo¨ssbauer spectra depended upon Zn concentration x. For x≤0.6 samples the spectra indicated the coexistence of two magnetic sextets due to the Fe^(3+)ions on the tetrahedral and the octahedral sites respectively and a central doublet of paramagnetic type resulting from the superparamagnetic Fe^(3+) species. While the sample of x=0.7 showed the relaxation behavier and the paramagnetic quadrupole splitting, the Mo¨ssbauer spectra of x≥0.8 samples showed two lines due to the quadrupole splitting. These results imply that the magnetic properties of Ni_(1-x)Zn_xFeAIO_4 ferrite system vary from the ferrimagnetism with the superparamagnetism to the paramagnetism as increasing Zn concentration x. Also the magnetic hyperfine field values corresponding to the crystallographic sites for the x≤0.6 samples decreased as increasing Zn concentration x.

Holmium Laser Enucleation of the Prostate for Benign Prostatic Hyperplasia: Effectiveness, Safety, and Overcoming of the Learning Curve

황진철,박상명,이종복 대한비뇨의학회 2010 Investigative and Clinical Urology Vol.51 No.9

Purpose: To examine the efficacy and safety of holmium laser enucleation of the prostate (HoLEP) for the surgical treatment of benign prostatic hyperplasia and to estimate the time to overcome the learning curve. Materials and Methods: From May 2008 to October 2009, 164 consecutive patients treated with HoLEP were enrolled in this study. International Prostate Symptom Score (IPSS), peak urinary flow rate (Qmax), and postvoid residual urine (PVR) were documented preoperatively and at 6 weeks and 3, 6, 12, and 18 months postoperatively. The 164 study subjects were divided into 3 groups (group 1 the first 50 patients treated, group 2 the second 50, and group 3 the third 64), and perioperative data and complications were analyzed in these groups to determine the learning curve. In addition, the inverse and upward techniques were compared in terms of the effects and the stability of morcellation. Results: The mean patient age was 69 years, and the average operation time was 62 minutes (range, 20-208 minutes). Mean prostate volume was 54.2 ml and mean resected tissue weight was 18.6 g. Postoperatively, IPSS and PVR decreased and Qmax increased significantly. Postoperative complications were transient incontinence (8.5%), urinary retention (4.3%), hematuria (3.0%), urinary tract infection (1.2%), and urethral stricture (0.6%), and intraoperative complications were minor capsular perforation (4%) and bladder injury (8%). Conclusions: HoLEP was found to be effective and safe regardless of prostate size. We recommend that a systematic educational program be established to reduce the learning curve.

재난변동풍하중을 받는 고층건물의 변동풍압분포의 평가

황진철(JinCheol Hwang) 한국방재안전학회 2013 한국방재안전학회 논문집 Vol.6 No.2

본 논문에서는 재난변동풍하중을 받는 고층건물의 예비설계과정에서 필요로 하는 자료를 얻기 위하여 경계층풍동 실험을 실시했다. 먼저 본 실험에 앞서 경계층풍동내의 자연풍을 얻기 위하여 확산장치를 이용했고, 이로부터 평균풍속 수 직분포, 난류강도, 파워스펙트럼으로 입증했으며, 이후 변장비 1:2 강체모형을 이용 경계층풍동실험을 실시한 결과로부터 다음과 같은 결론을 얻을 수 있었다. 1. 경계층풍동에서의 평균풍속 및 난류강도의 수직분포가 자연풍과 같이 잘 실현되었다. 2. 변동풍속 스펙트럼은 Von Karman spectrum과 비교한 결과 잘 일치했다. 3. 변동압력 스펙트럼에서 풍상면의 피크분포는 0.01-0.1 Hz영역에서 발생했고, 풍후면은 0.1 Hz영역에서 발생했다. 4. 자기상관계수는 재난변동풍하중의 작용시간이 증가하면 정성확률과정으로 분포하는 사실을 알 수 있었다. In this paper, used by the boundary layer wind tunnel test, have conducted a series of wind tunnel experiments, i.e. test the mean velocity profile regarding the surface roughness, turbulence intensity and power spectrum measured by augmentation device. After that, to provide data relevant for the preliminary design step of tall building hazard fluctuating wind loads may be obtained fluctuating pressure coefficients, fluctuating pressure spectrum, autocorrelation coefficients by the boundary layer wind tunnel test. From the results of experiments, this study can be obtained conclusions as follows. 1. We know the fact that the mean velocity profile and the turbulence intensity are well fitted natural wind flow in the boundary layer wind tunnel. 2. The satisfactory agreement of velocity spectrum can be obtained from the compare of fluctuating power spectrum and Von Karman spectrum. 3. We know the fact that the fluctuating pressure spectrums distributed peak at 0.01 Hz-0.1 Hz in the windward surfaces and at 0.1 Hz in the leeward surfaces. 4. We know the fact that the autocorrelation coefficients distributed stationary random processes with application time of hazard fluctuating wind loads.

한국여자프로골프선수의 완벽주의 성향, 자기관리 및 경기력의 관계

황진철(Hwang, Jin-Chul),전병관(Chun, Byung-Kwyan) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.6

The Purpose of this study was to examine the relationship among the perfectionism, self-management and cognitive performance of Korean female professional golfers. Using a purposive sampling method, and the questionnaire based on previous study, 203 participants were sampled from the 2012-2013 KLPGA tour seed. The questionnaire consisted of 38 questions, of which validity and reliability were already tested. For this purpose of this study, factor analysis, reliability analysis, frequency analysis, independent t-test, one-way ANOVA, correlation analysis, and multiple regression analysis were used. And it attempted to make a qualitative analysis of the influence on Korean female professional golfers" performance ability through in-depth interviews. To endorse quantitative study" s result, the subjects were 9 female professional golfers. As a result of these data analysis, the conclusions can be summarized as followings; First, according to personal characters(tour level, age, career, exercise time, frequency), there were statistically significant differences. Second, perfectionism influenced on self-management significantly. Third, perfectionism influenced on cognitive performance significantly. Fourth, self-management influenced on cognitive performance significantly. Fifth, perfectionism, self-management and cognitive performance were identified as important influential factors to improve the performance ability for Korean female professional golfers.

만성골반통증후군 환자에서 다중 중합효소 연쇄반응을 이용한 미생물 검출의 결과

서강일,황진철,김태완,이수형,박서용,노상휴 대한비뇨의학회 2009 Investigative and Clinical Urology Vol.50 No.11

Purpose: The aim of this study was to evaluate the results of multiplex polymerase chain reaction (PCR) in patients with chronic pelvic pain syndrome (CPPS) and the significance of microorganisms as the causative factor of CPPS. Materials and Methods: We evaluated the frequency of 19 possible causative microorganisms of prostatitis in 849 patients who had prostatitis symptoms from April 2007 to March 2009 by using multiplex PCR. All of the enrolled patients were category III by the definition of the NIH Chronic Prostatitis Workshop. Results: Of the 849 patients, 414 (49%) and 435 (51%) were categories IIIa (inflammatory CPPS) and IIIb (noninflammatory CPPS). On multiplex PCR, using the third voided urine specimen (VB3), 369 (89%) of the 414 category IIIa and 367 (84%) of the 435 category IIIb cases were found to have positive PCR results for causative microorganisms. The common microorganisms were Enterococcus, Ureaplasma urealyticum, Lactobacillus, Streptococcus agalactiae, and Chlamydia trachomatis in 173 (18%), 144 (15%), 129 (13%), 78 (8%), and 69 cases (7%), respectively. Conclusions: There were too many positive PCR results for causative microorganisms in the CPPS patients despite negative urine culture examination. Therefore, it is necessary to rule out contamination of the specimen to achieve reliable results with multiplex PCR. However, multiplex PCR can detect various unknown microorganisms suggestive of the etiology of CPPS, particularly those that are difficult to cultivate. PCR is expected to play an important role in the diagnosis of CPPS, but further studies will be required to define the usefulness of molecular tests. Purpose: The aim of this study was to evaluate the results of multiplex polymerase chain reaction (PCR) in patients with chronic pelvic pain syndrome (CPPS) and the significance of microorganisms as the causative factor of CPPS. Materials and Methods: We evaluated the frequency of 19 possible causative microorganisms of prostatitis in 849 patients who had prostatitis symptoms from April 2007 to March 2009 by using multiplex PCR. All of the enrolled patients were category III by the definition of the NIH Chronic Prostatitis Workshop. Results: Of the 849 patients, 414 (49%) and 435 (51%) were categories IIIa (inflammatory CPPS) and IIIb (noninflammatory CPPS). On multiplex PCR, using the third voided urine specimen (VB3), 369 (89%) of the 414 category IIIa and 367 (84%) of the 435 category IIIb cases were found to have positive PCR results for causative microorganisms. The common microorganisms were Enterococcus, Ureaplasma urealyticum, Lactobacillus, Streptococcus agalactiae, and Chlamydia trachomatis in 173 (18%), 144 (15%), 129 (13%), 78 (8%), and 69 cases (7%), respectively. Conclusions: There were too many positive PCR results for causative microorganisms in the CPPS patients despite negative urine culture examination. Therefore, it is necessary to rule out contamination of the specimen to achieve reliable results with multiplex PCR. However, multiplex PCR can detect various unknown microorganisms suggestive of the etiology of CPPS, particularly those that are difficult to cultivate. PCR is expected to play an important role in the diagnosis of CPPS, but further studies will be required to define the usefulness of molecular tests.

Acute Urinary Retention due to Aseptic Meningitis: Meningitis-Retention Syndrome

김태완,황진철,이수형,최정인,박상명,이정복 대한배뇨장애요실금학회 2010 International Neurourology Journal Vol.14 No.2

Acute urinary retention in aseptic meningitis is rarely encountered, and the diagnosis of aseptic meningitis may be less than straightforward, because its symptoms and neurological signs are occasionally mild or absent. We report a case in which acute urinary retention provided an appropriate indication for the diagnosis of aseptic meningitis as the cause of an undiagnosed fever.

Mo¨ssbauer Spectroscopy에 衣한 Hamatinics內의 鐵의 酸化狀態 및 Spin狀態의 硏究

洪致裕,黃鎭澈,尹仁燮 동국대학교 산업기술대학원 1993 산업기술논문집 Vol.1 No.-

Mo¨ssbauer spectroscopy has been carried out to investigate the ionic states of Fe atoms contained in the hematinics. From the Mo¨ssbauer parameters we can define the hyperfine interactions of Fe atoms with surrounding elements related to Fe ionic states. The Fe in the sample used as hematinics usually exist in the S=2 high spin state of Fe^(+2) or in the S=1/2 low spin state of Fe^(+3). In this study we knew that Fe^(+2) state was preferable to Fe^(+3) state on the hematinics.

Mo¨ssbauer분광법에 의한 Ca_(0.75)Ba_(0.25)Fe_2O_4의 Fe이온에 대한 연구

홍치유,윤인섭,조수열,김영민,황진철 東國大學校 1992 東國論叢 Vol.31 No.-

The Mo^ssbauer spectrum of CaFe_2O_4, consists of paramagnetic two doublets absorption peaks at room temperature. But, the replacement of Ca^+2 ions in CaFe_2O_4 with Ba^+2 ions changes the magnetic properties without changing the crystal structure and the Mo^ssbauer spectrum of Ca_0.75Ba_0.25Fe_2O_4 consists of paramagnetic two doublets and ferrimanetic three different Zeeman sextets absorption peaks due to the Fe^57 nuclei in the various sublattices. According to this study, the Fe ions in the Ca_0.75Ba_0.25Fe_2O_4 are trivalent in al sublattices and there are more than three sublattices in this structure.

Mo¨ssbauer 분광법에 의한 MgFe_(2-x)Al_xO_4계의 Fe이온에 대한 연구

홍치유,윤인섭,김영민,황진철,조수열 東國大學校 1993 東國論叢 Vol.32 No.-

In this study, the magnetic properties and hyperfine interaction have been investigated by Mo‥ssbauer spectroscopy. The samples were prepared by ceramic sintering method with Al contents x. Mo‥ssbauer spectra of the MgFe_(2-x)Al_xO_4 system have been taken in room temperature and the superparamagnetic effect appeared for Al substitution content x≥0.8. The isomer shift of Fe ions in octahedral site decreased as increasing Al contents x, but in tetrahedral site it were constant. The magnetic hyperfine fields of samples decreased as increasing Al contents x in both site, octahedral and tetrahedral site. But magnetic transition patterns did not appeared in spite of increasing the nonmagnetic ion, Al^(3+), contents x.

주니어 골프선수들의 성취목표성향이 스포츠자신감과 운동몰입에 미치는 영향

전병관(Chun, Byung-Kwyan),황진철(Hwang, Jin-Chul) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.6

This purpose of this study was to examine the effect of achievement goal orientations on sports confidence and commitment of junior golfers. Using a purposive sampling method and the questionnaire based on previous study, 347 junior golfers. The method of the statistical analysis used in this study were t-test, one-way ANOVA, correlation analysis and regression analysis. The conclusion of this study were First, there were significant differences of achievement goal orientations, sports confidence and commitment in gender, grade, career of golf and career of winning. Second, The achievement goal orientations effected on sports confidence of junior golfers significantly. Third, The achievement goal orientations effected on sports commitment of junior golfers significantly. Forth, The sports confidence effected on sports commitment of junior golfers significantly.