^(99m)TC Phytate 간스캔에 있어서 정량적 간외섭취율의 임상적 의의

김병수,문태용,김건일,남상화,한국상 부산의대 1991 부산의대잡지 - 부산대학교 의과대학 Vol.31 No.2

MgB₄O7 熱螢光體의 특성과 低에너지 X線의 線量測定

김영국,손인호,설정식,채건식,노경석 慶南大學校 附設 基礎科學硏究所 1997 硏究論文集 Vol.11 No.-

To develope the thermoluminescent radiation sensors and low energy X-ray of dosimetry. The TL phosphors of MgB₄O7 are prepared and their physical characteristics are investigated. MgB₄O7 : Tb. Tm. Dy. La. Ho. and Nd phosphors have been prepared by sintering around 580℃ for 2 hours followed by flowing Ar gas. Ar gas. Activation energy and kinetic order of main peak of glow curve were studied by two methods peak shape method and initial rise method. By these methods, the estimated activation energies were 0.76±0.02eV(Tb doped). 0.94±0.03(Tm doped). 0.72±0.02 (Dy doped). respectively. The activation energy frequency factor and kinetic order of thermoluminescent process for each TL phosphors are measured by analyzing the glow curve by initial rise. peak shape. different heating rate. isothermal decay method. And The emission spectra of TL phosphors are also measured. The TL phosphors prepared in this work may be utilized to radiation sensor elements becaue of their high sensitivity to low energy X-ray.

초유동 ³He과 경계조건

김동락,채건식,김영국 慶南大學校 附設 基礎科學硏究所 1995 硏究論文集 Vol.7 No.-

The effects of the ⁴He interfacial layer on the average superfluid fraction (pdp) were measured as a function of temeperature, pressure, and poresize by means of fourth sound propagation. Up to a pore size dependent threshold ⁴He coverage. pdp remain equal tl those for pure ³He. Beyond the threshold. pdp rapidly increase as ⁴He coverage is increased. The enhancements vanish at pressure greater than some critical pressures depending on ⁴He thickness and pore size.

종격동 종괴를 의심케한 우대동맥궁 1례

김만우,백학연,정춘해,장경식,홍순표,조건국,김종진 朝鮮大學校 附設 醫學硏究所 1987 The Medical Journal of Chosun University Vol.12 No.1

Developmental anomalies of the aortic arch, commonly known as vascular rings, are relatively rare congenital vascular anomalies which can compress the trachea and esophagus. One routine chest film of a patient who was checked and hepatoma-diagnosed in Internal Medicine, Chosun University Hospital left the room for doubt of mediastinal mass. But no subjective symptoms for the mass was told by the patient. This is to report our experience of a patient having right side aortic arch with aberrant left subclavian artery, as proved by diagnosis, but none of congenital heart disease. This right side aortic arch with aberrant left subclavian artery is the most frequent type among right aortic arch, the anomaly of which is usually detected from the incidental suspicion for mediastinal mass at routine chest film; because no symptoms are accompanied therewith.

각종 암종질환에서 혈청구리 및 아연농도의 변화에 관한 연구

김만우,오금탁,장경식,채종구,홍순표,조건국 朝鮮大學校 附設 醫學硏究所 1987 The Medical Journal of Chosun University Vol.12 No.1

The copper and zinc concentrations were measured in sera of 27 cases of hepatoma, 20 cases of stomach ca., 7 cases of esophageal ca., 12 cases of colorectal ca., 9 cases of lung ca., 18 cases of ovarian ca. and 48 cases of normal control in Chosun University Hospital from Jan. 1986 to July 1986. The results are as follows; 1. The mean concentration of copper in serum of normal control group was 96.0±5.02㎍/㎗ (Mean±2SE), in hepatoma, stomach ca., esophageal ca., colorectal ca., lung ca. and ovarian ca. concentrations were significantly increased each 126.4+12.77, 125.6±11.29, 140.5±14.23, 117.3±11.91, 181.4±30.56 and 130.5±13.80㎍/㎗ (P < 0. 001) in comparison with the mean value of normal control group. 2. The mean concentration of zinc in serum of normal control group was 104.8±3.40㎍/㎗ (Mean±2SE), in hepatoma and lung ca. concentrations were significantly decreased each 65.1±7.27 and 72.7±12.86 ㎍/㎗ (P < 0. 00l). 3. The ratio of serum copper level to zinc level (Cu/Zn ratio) in serum of normal control group was 0.94±0.057 in hepatoma, stomach ca., esophageal ca., lung ca. and ovarian ca. concentration ratios were significantly increased each 2.09±0.324, 1.86±0.122, 1.50±0.114, 2.55±0.513 and 1.51±0. 243 (P < 0.001).

Mg₂SiO₄ 열형광선량계에서 활성제 농도가 Glow곡선에 미치는 영향

김영국,손인호,채건식 경남대학교 환경문제연구소 1996 환경연구 Vol.18 No.-

The Mg_(2)SiO_(4) thermoluminescent phospher has been prepared by sintring Mg_(2)SiO_(4) after doping the transition elements Dy. Nd. Ho. La and Tb. The beating rate of this thermoluminescent phosper is 10℃/sec. The maximum peaks are found in the measured Mg_(2)SiO_(4) TL glow curve at 220℃, 252℃, 345℃, 229℃ and 289℃ when the \transition elements Dy, Nd, Ho, La and Tb are 1 ~5 wt. %. The thermoluminescence process in Mg_(2)SiO_(4) : Dy, Nd, Ho, La and Tb are found to the 2nd order when the main peak of the glow curve is analyzed by peak shape method. The Mg_(2)SiO_(4) thermoluminescent phosphor is the most sensitive to the X-rays. The dose responses of Mg_(2)SiO_(4) : Du, Nd, Ho, La, and Tb TLDs are linear up to intensity of X-ray.

Mg₂SiO₄ : La, Ho 열형광선량계에서 활성제 농도가 글로우 커브에 미치는 영향 La, Ho TLD on Activation Concentration

김영국,손인호,채건식,노경석,오재근,이은숙 경남대학교 신소재연구소 1996 論文集 Vol.6 No.-

본 연구에서는 Mg₂SiO₄에 활성화 물질로 La, Ho를 첨가하여 열형광체를 제작하였고 불순물의 농도를 1wt.% ∼5 wt.%까지 변화시키면서 열평광강도의 glow curve를 측정하였다. 도한 열형광체의 glow curve를 peak shape법으로 분석해서 TL특성에 대한 포획 매개변수와 활성화 에너지, 발광차수, 선량의존성등을 조사하였으며, 그 물리적 특성을 조사하고 선량계로서 타당성과 실용성을 확인하였다. The Mg₂SiO₄: La, Ho thermoluminescent phospher has been prepared by sintring Mg₂SiO₄after doping the transition elements La and Ho. The heating rate is 10℃/sec at this thermoluminescent phospher are heated. The maximum peaks are found in the measured Mg₂SiO₄: La and Ho. TL glow curve at 229℃ and 345 C when the 1 wt.%-5 wt.%. The glow curve of TLD increased TL intensity and temperature of peak appears to the high temperature when the heating rate is l0℃/sec-25℃/sec. The activation energy of the main peak has been estimated by the peak shape method. The estimated activation energies are 1.77 eV. 1.52 eV respectively. The thermoluminescence process in Mg₂SiO₄: La and Ho are found to the 2nd order when the main peak of the glow curve is analyzed by peak shape method. The dose responses of Mg₂SiO₄: La and Ho TLD are linear up to intensity of X-ray.

활성제가 Magnesium Borate의 TLD 특성에 미치는 영향

김영국,손인호,채건식 慶南大學校 附設 工業技術硏究所 1997 硏究論文集 Vol.15 No.1

Magensium Borate 열형광선량계를 아르곤가스 분위기 속에서 ?? 분말에 활성제로 Tb, Tm, Dy, La,Ho 및 Nd를 첨가하고 550℃로 2시간 동안 가열하여 제작하였다. 가온율은 20℃/sec이었고, 활성체의 농도가 2∼3 wt.%일 때 최대 peak는 160℃ 근방이었으며, 활성화에너지는 0.72∼1.55 eV이었다. 이 열형광선량계는 X- 선에 민감하였으며, 인가된 방사선의 선량에 선형적인 열형광강도를 보였다. 따라서 본 실험에서 제작한 열형광선량계는 비교적 높은 에너지의 방사선 선량을 측정하는데 효과적인 센사로 생각된다. The Magnesium Borate thermoluminescent dosimeter have been prepared by sintering ?? powers doped with activation materials, Tb, Tm, Dy, La, Ho and Nd at 550℃ for 2 hours in argon atmosphere. The heating rate of this TL phosphors 20℃/sec. The maximum peak of the ??: Tb, Tm, Dy, La, Ho and Nd TL glow curvers are found in at the 160℃ when Tb, Tm, Dy, La, Ho and Nd concentrations are 2∼3 wt.%. The estimated activation energies are 0.72∼1.55 eV. The ?? TL phoshpors are the most sensitive X-rays among the other materials. The dose responses of TLD are linear up to intensity of X-rays. The TL phosphors prepared in this work may he utilized to radiation sensor elements became of their high senstivity to high energy radiation.

Mg₂SiO₄와 MgB₄O 열형광선량계에서 활성제 농도가 Glow Curve에 미치는 영향

김영국,손인호,채건식 慶南大學校 附設 工業技術硏究所 1996 硏究論文集 Vol.14 No.1

본 연구에서는 Mg₂SiO₄, ?? 에 활성화 물질로 Dy, Tb등 희토류계 불순물을 첨가하여 열형광체를 제작하였고 불순물의 농도를 1 wt.% ∼ 5wt.%까지 변화시키면서 열형광강도의 glow curve를 측정하였다. 또한 열형광체의 glow curve를 peak shape법으로 분석해서 TL특성에 대한 포획 매개변수와 활성화 에너지, 발광차수, 선량의존성등을 조사하였으며, 그 물리적 특성을 조사하고 선량계로서 타당성과 실용성을 확인하였다. The Mg₂SiO₄, ?? thermoluminescent phospher has been prepared by sintring Mg₂SiO₄, ?? after doping the transition rare earth elements. The heating rate is 10℃/sec at this thermoluminescent phospher. The maximum peaks are found in the measured Mg₂SiO₄and ??. The former TL glow curve at 229℃ and 345℃ when the 1 wt.% ∼ 5 wt.%, the latter 260℃ and 300℃ when the 1 wt.% - 5wt.% impurity concentration. The activation energy of the main peak has been estimated by the peak shape method. The estimated activation energies are 1.77 eV, 1.52 eV respectively. The thermoluminescence process in Mg₂SiO₄: La and Ho are found to the 2nd order when the main peak of the glow curve is analyzed by peak shape method. The dose responses of Mg₂SiO₄: La and Ho TLD are linear up to intensity of X-ray.

청소년의 생활습관이 대뇌각성수준에 미치는 영향

김근국,김세환 江原大學校附設體育科學硏究所 1994 江原大學校附設體育科學硏究所論文集 Vol.- No.18

The purpose of this study was to examine effects of adolescents' life styles, such as sleeping and meal patterns, on their arousal level in school. The experiment was conducted on a sample of 253 male students, 202 first graders and 51 third graders in junior high schools. The Korean edition of "A self assessment questionnaire to determine morningness-eveningness," originally prepared by Horne and Ostberg, was used to judge the morningness or the eveningness of the students. In order to check the validity of the questionnaire, the students' body temperatures from 7 : 00 a. m. to 12 : 00 p. m were taken, and the presence of a difference in fluctuations of the body temperatures between the morningness group and the eveningness group was confirmed. Their life style were surveyed using a our-own made questionnaire, while their arousal levels were measured by the Flicker test. Between the morningness group and the eveningness group, their are statistically significant differences in the patterns of rising (P<0.05), the appetite in the morning (P<0.05), and physical and mental conditions (P<0.01), Especially, the morningness group shows a significantly higher arousal level during schooltime from 9 : 00 a. m. to 4 : 00 p. m. than the eveningness group. Comparison of life styles of the groups shows that students in the eveningness group the tendencies to stay up till late, get up without recovering from their fatigue, and suffer from loss of appetite when they begin their daily work in the morning. Further, since the eveningness group shows a much lower arousal level in school than the morningness group, it seems that a special care should be paid to the former group not only for the enhancement of the efficiency in their learning but for prevention of various possible accidents. As a results, persistent and good guidance is required to lead adolescents to a sound life style.