1998년과 2007년 사이 12∼13세 남녀 청소년의 체격, 골격성숙도, 체력 비교

송종국(Jong Kook Song),채서연(Seo Yeon Chae),채주희(Joo Hee Chae),김현배(Hyun Bae Kim),강효정(Hyo Jung Kang) 한국사회체육학회 2008 한국사회체육학회지 Vol.0 No.34

The purpose of the present investigation was to compare physique, skeletal maturation and physical fitness in Korean adolescents measured between 1998 and 2007. Subjects participated in the study were a total of 473 Korean adolescents aged 12 to 13 years. In 1998, 349 adolescents were selected from a middle school, located in Sungnam city and 124 middle school students aged 12-13, located in Yongin city were participated in 2007. All measurements were conducted by one of the reseachers (Jong-Kook Song) with two different group of investigators between 1998 and 2007. Anthropometric characteristics were body mass, body height, sitting height, circumferences taken at sites of upper arm, flexed upper arm, chest, waist, hip, thigh, and calf, bone breadth taken at the sites of humerus, and femur, skinfold thicknesses taken at the sites of triceps, subscapular, suprailiac, thigh and medial calf. Skeletal maturity was assessed by TW3 (Tanner et al., 2001). Maturity scores for Radius-Ulna-Short bones (RUS) and bone age were calculated. Physical fitness parameters included flamingo balance, sit and reach, grip strength, sit-ups, standing long jump, bent arm hang, 50m shuttle run and multi-stage shuttle run. All data were analyzed by SAS Enterprise 3.0. Means and standard deviations were calculated by descriptive statistics. Independent t-test was applied to compare dependent variables between measurements. The level of significance was set at p<0.05. Results of the study showed that male adolescents aged 12-13years in 2007 had significantly higher (p<0.0001) femur diameter than adolescents in 1998. Male adolescents in 2007 had higher (p<0.05) chest, waist and calf circumferences than those of adolescents in 1998. Although no difference were found for RUS and bone age in males adolescents between 1998 and 2007 female adolescents in 2007 were significantly delayed for their skeletal maturity level compared to female adolescents in 1998. For physical fitness parameters male adolescents aged 12 years in 2007 performed better for flamingo balance (p<0.01), and 50m shuttle run (p<0.05) than those of adolescents in 1998. However, stand long jump and bent arm hang were significantly decreased in male adolescents in 2007. Female adolescents aged 12-13 years in 2007 had significantly higher flamingo balance, but female adolescents aged 12 years in 2007 performed significantly less for standing long jump (p<0.0001), bent arm hang (p<0.001) and speed (p<0.05) than those of female adolescents in 1998. In conclusions this study suggest that chest circumference for both male and female adolescents in 2007 was significantly higher than those in 1998. Skeletal maturity for female adolescents in 2007 were significantly delayed compared to female adolescents in 1998. Further study is needed to evaluate consistent various.

한국인 직무 스트레스 측정도구의 개발 및 표준화

장세진,고상백,강동묵,김성아,강명근,이철갑,정진주,조정진,손미아,채창호,김정원,김정일,김형수,노상철,박재범,우종민,김수영,김정연,하미나,박정선,이경용,김형렬,공정옥,김인아,김정수,박준호,현숙정,손동국 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4

Background and Purposes: Over the past three decades, numerous studies performed in Korea have reported that job stress is a determinant risk factor for chronic diseases and work disability. Every society has its own culture and occupational climate particular to their organizations, and hence experiences different occupational stress. An occupational stress measurement tool therefore needs to be developed to estimate it objectively. The purpose of this study is to develop and standardize the Korean Occupational Stress Scale (KOSS) which is considered to be unique and specific occupational stressors in Korean employees. Subjects and Methods: Data were obtained from the National Study for Development and Standardization of Occupational Stress (NSDSOS Project: 2002-2004). A total of 12,631 employees from a nationwide sample proportional to the Korean Standard Industrial Classification and the Korean Standard Occupational Classification were administered. The KOSS was developed for 2 years (2002-2004). In the first year, we collected 255 items from the most popular job stress measurement tools such as JCQ, ERI, NIOSH and OSI, and 44 items derived from the a qualitative study (depth interview). Forty-three items of KOSS, in the second year, were retained for use in the final version of the KOSS by using Delphi and factor analysis. Items were scored using conventional 1-2-3-4 Likert scores for the response categories. Results: We developed eight subscales by using factor analysis and validation process: physical environment (3 items), job demand (8 items), insufficient job control (5 items), interpersonal conflict (4 items), job insecurity (6 items), organizational system (7 items), lack of reward (6 items), and occupational climate (4 items). Together they explained 50.0% of total variance. Internal consistency alpha scores were ranged from 0.51 to 0.82. Twenty-four items of the short form of the KOSS (KOSS-SF) were also developed to estimate job stress in the work setting. Because the levels of the subscales of occupational stress were gender dependent, gender-specific standard norms for both the 43-item full version and the 24-item short form using a quartile for the subscales of KOSS were presented. Conclusion: The results of this study suggest that KOSS might be an appropriate measurement scale to estimate occupational stress of Korean employees. Further and more detailed study needs to be conducted to improve the validity of this scale.

비화농성 삼출성 복수를 동반하는 질환에서 복막 침생검의 진단적 의의

정종훈,서용태,오덕환,채종구,정춘해,조건국 朝鮮大學校 附設 醫學硏究所 1986 The Medical Journal of Chosun University Vol.11 No.1

Percutaneous needle biopsies of peritoneum with Abrams needle and Cope needle were done un 64 patients with non-purulent exudative ascites, who was admitted to the department of internal medicine, Chosun University hospital, from January 1978 to Deccmber 1983. The diagnostic significance and safety of the needle biopsy was estimated. The results were as follows. 1. Adequate peritoneal tissue for pathological diagnosis was obtained in 53 cases(82.8%) among 64 cases. (Abrams needle 84.8%, Cope needle 80.6%) 2. Definitive diagnosis was obtained in 31 cases among 53 cases (58.6%). (Tuberculosis 23 cases, malignancy 8 cases). 3. As compared final diagnosis with biopsy result, the rate of final diagnosis corresponding with biopsy diagnosis was 58.8% in tuberculosis and 26.3%, in malignancy, but the rate of biopsy diagnosis corresponding with final diagnosis was 100% in both tuberculosis and malignancy. 4. Cases of chronic non-specific inflammation which were diagnosed by biopsy were 13cases(24.5%)among 53 cases, and among these cases, tuberculosis was 69.2% and malignancy 30.8% on final diagnosis and among 53 cases, histologically normal was 9 cases(16.9%) of which 33.3% was tuberculosis and 66.7% was malignancy on final diagnosis. 5. Of the malignant cases on final diagnosis, Positive cytologic examination of ascitic fluid was 16.7% 6. Primary losions of cancerous peritonitis were stomach cancer (38.9%) hepatocellular cancer(22.2%) colon cancer (11.1%) ovarian cancer (11.1%) Pancreatic cancer (5.6%). 7. Complication of percutaneous peritoneal biopsy was local swelling with leakage of ascitic fluid and the accident rate were 36.4,% in Abraham needle and 3.2% in Cope needle.

알루미나 분산 세리아 안정화 지르코니아 복합체의 제조 및 소결특성

김영정,이종국 조선대학교 생산기술연구소 2006 生産技術硏究 Vol.28 No.2

Alumina/zirconia composites were fabricated from the dispersion of 20-60% alumina in ceria stabilized zirconia and their sintered properties and microstructures were investigated. Slurry of composites for spray drying was prepared by mixing of alumina powder, zirconia powder and ceria nitrate. The optimal condition for nozzle spray-drying in alumina/zirconia slurry was the mixing of 60 vol% alumina/zirconia powder containing 12 ㏖% Ce(No_(3))_(3) and 40 % water, and after milling for 24h in zirconia jar. Stabilized slurry was obtained by addition of binder(PVA 1.0wt%), dispersant(sodium phosphate) 1 wt%, and plasticizer(PEG) 0.5 wt%. The sphehcal granule by spray-drying was fabricated by processing condition of inlet temperature(300℃), outlet temperature(180℃) slurry feeding speed(850 rpm) and atomizer speed(40 ㎐). The highly dense compact about 95% of theoretical was obtained in 30vo1% alumina-zirconia composition by the CIP under the pressure of 200 ㎫ and the sintering at 1500℃ for 2h.

알루미나 첨가가 불규칙 입자형상을 갖는 세리아 안정화 지르코니아의 미세구조에 미치는 영향

김민정,이종국,박종곤 조선대학교 생산기술연구소 1999 生産技術硏究 Vol.21 No.2

The effect of Al₂O₃ addition on the microstructure of ceria-stabilized zirconia with irregular grain shape was investigated. Specimens doped with a mixed solution of Al₂O₃+ Ce(NO³)₃ showed undulated grain shape after annealing at 1650℃ for 2h. The specimens added Al₂O₃ inhibited grain growth of Ce-TZP and simultaneously increased the irregularity of the grain shape due to drag effect. Ceria concentration difference between convex and concave sides in irregular grains was observed over 1mol%.

‘수주산업 회계 투명성 제고방안’의 의도를 시장은 인지하고 있는가?

옥오정(Ohk, Oh-Jung),박종국(Park, Jong-Kook),김수진(Kim, Soo-jin) 한국경영교육학회 2021 경영교육연구 Vol.36 No.3

冷却 條件 變化에 따른 저밀도 폴리에틸렌의 絶緣 破壤 特性에 관한 硏究

박정수,이수원,황종국,손인환 철도전문대학교 1993 論文集 Vol.10 No.1

In order to change the crystallinity of low density polyethylene film, the sample cooling with air, ice and liquid nitrogen was studied for the temperature dependence of dielectric breakdown strength at the temperature range of l0℃∼120℃ As a result, breakdown strength was influenced that increase of crystallenety was due to the decrease of dielectric loss under the glass transition temperature and to the decrease of effect for space charge with Micro Brown Ion motion over the glass transition temperature. In accordance with the rise of surrounding temperature, AC breakdown strength was less dependent of change of crystallinity but the DC and Impulse breakdown strength was highly dependent of et.

분무조립에 의한 이트리아 안정화 과립분말의 제조

이종국,김민정,노희진,배지수 조선대학교 생산기술연구소 2000 生産技術硏究 Vol.22 No.1

Yttria-stabilized zirconia granule powder was prepared by a spray drying method, and the compacted and sintered behaviors were investigated Optimum slurry was prepared by the mixing of 70 vol% zirconia powder and 30% water and milling for 15 h in zirconia jar The slurry was stabilized by the addition of binder(PEG 155%, PVA 05%), dispersant(Cerasperse) 06%, Antifoaming agent(SN Defoamer) 03%, and Lubricant(Lu-6418) 1%, and the viscosity of this slurry showed the 5 dPas The optimum condition for the spray-drying of yttria stabilized zirconia powder is the inlet temperature of 110℃, outlet temperature of 90℃, slurry feeding rate of 140cc/min , and atomizer speed of 9000 rpm.

액상 화학합성법에 의한 나노분말 합성기술

김영정,이종국 조선대학교 생산기술연구소 2007 生産技術硏究 Vol.29 No.2

Liquid- phase synthesis is a well-known chemical manufacturing method for an extensive variety of nanopowder and can be available to praparation of nano-sized particles in applications to dispersed systems of nano-ink and nano- coatings. The control the dispersion stability as well as particle morphology is very important in this system. The paper will present the basics of the liquid-phase synthesis and particle formation process. Also, several technologies such as coprecipitation , sol-gel, hydrothermal, solvothermal, and mechanochemical method will be introduced and their specific advantages will be pointed out.

습식화학법에 의한 TiO_(2)/수산화아파타이트 생체복합재료의 제조

황규홍,정항철,이종국 조선대학교 생산기술연구소 2003 生産技術硏究 Vol.25 No.1

TiO₂/Hydroxyapatite (HAp,Ca_10(PO₄)_(6)(OH)₂) composite powders were prepared by mixing of the TiO₂ and the HAp powders which had been synthesized through sol-gel, precipitation, hydrothermal and mechanochemical-hydrothermal methods The mixing ratio was fixed with 1 1 ratio (Ti0₂/HAp,wt %). TiO₂/HAp composite powders showed different microstructures depending on their particle size and shape The nano-sized HAp particles were coated on the surface of large TiO₂ particles, whereas they were well mixed and dispersed when both TiO₂ and HAp were nanocrystallites.