풍촌 석회암의 소성에 관한 연구

이재장,노범식,장경호,정수현 강원대학교 석재복합신소재제품연구센터 1997 석재연 논문집 Vol.2 No.-

본 연구는 여러 가지 용도에 적합한 생석회를 생산하기 위하여 풍촌 석회석을 대상으로 소성시험을 하였다. 시료의 형상은 주로 정방형이나 때로는 구형을 나타내며, 배색 내지 회백색을 띈다. 소성시험에 사용한 시료의 크기는 45∼50㎜ 이며, 소화시험에서는 3.3mm(6mesh) 이하로 분쇄하여 소성하였다. 시료의 광물학적 특성을 보기위하여 편광현미경 관찰, X-ray 분석, 열분석을 하였다. 시료는 거의 순수한 CaCO₃이었으며, 600℃ 부터 열분해가 시작되어 850℃에서 완결되었다. 화학분석 결과 CaO 98.27%인 잠재적 순도를 갖는 생석회를 얻을 수 있음을 알 수 있다. 대략 50 ㎜ 정도의 석회석은 전기로의 온도가 실온에서 1,050℃에 도달하였을 때 99%이상이 소성되었다. 이 때 얻어진 생석회는 거의 순 백색이며 갈라짐이 없었다. 소화시험 결과 ASTM C-110에 의하면 반응성이 우수한 생석회인 것을 알 수 있으며, 1분 이내의 상승온도는 63℃ 이었다. In this study, the calcination characteristics of Pungchon limestone was investigated to produce the optimum quick lime for various uses. The shape of limestone sample was mainly cubic, but sometimes longish. Approximate size range for the calcination tests was from 45 to 50 mm. For the slaking test, it was crushed by cobbing method and screened by 3.3 mm(6 mesh) screen. Mineralogical studies of the sample were carried out to investigate textures, X-ray diffraction analysis and thermal analysis. The result of chemical analysis shows a very high grade limestone with a CaO potential of 98.27%. Approximate 50 mm size's of limestone, about 250 g was calcined more than 99% when the calcination temperature arrived at 1,050 ℃ from room temperature in the electric laboratory furnace. Lumpy lime in nearly white colour with nearly no cracks was observed during calcining test. and during calcination process the limestone places kept their shape. Slaking test(ASTM C-110 ) results indicate a high reactivity product. In slaking, a 63℃ temperature rise was achieved within the first one minutes.

줄눈 콘크리트포장의 우각부 하중 해석

심도식,이주형,윤경구 도립 강원전문대학 1998 道立 江原專門大學 論文集 Vol.1 No.1

This study focused on the development of an alternative stress estimation procedure to instantly calculate the critical stresses bonded concrete pavement. Closed form analysis is commonly used to analyze pavement structures. This type of analysis assumes linear elastic material properties and static loading conditions. The well-known ILLI-SLAB finite element program was used for the analysis. Bonded concrete overlay analyzed the stress distribution, behavior and load carrying . capacity under track load is made evaluation standard of bonded concrete overlay. In the study, the following results were derived ; The properties of strength is that compress and 3-point bending strength of existing pavement is deteriorated with 184 ㎏/㎠, 59 kg/㎠ but compress and splitting tensile strength of overlay is satisfied with 465 ㎏/㎠, 45 kg/㎠. Load transfers is happen at adjacent slab by interlocking under track load. The stress distribution under interior, corner and edge load is described high loading position surrounding then loading position.

SM20C의 ENCLOSED WELDING과 AC ARC WELDING의 피로한도 특성비교

김경식,이종형 國立金烏工科大學校附設生産技術硏究所 1996 産業技術開發硏究 Vol.12 No.-

It has been generally accepted that welding has several advantages to other mechanical joints welding parts, however, are liable to cracks and inhomogeniety of the structure. In this study the fatigue limits of the enclosed welding and AC are welding are compared. The result can be summarized as follows. The fatigue limit of enclosed welding is higher than that of AC are welding. Enclosed welding shows less distortion of angle. Residual stress is decreased with more repeated cycles in both cases.

상업스포츠 지도자의 운동지원이 운동만족 및 참가지속에 미치는 영향

김경식,이준수 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.2

This study was to analysis the effects of instructors' support on satisfaction and adherence of participation at the commercial sport center. To attain the goal of the study described above paragraphs, some members of commercial sports center held in Seoul were set as a collected group. Then, using the cluster random sampling method, finally drew out and analyzed 441 people in total. The material collection device was the brochure named <the instructors' support, satisfaction and adherence of participation>. The result of reliability check up was here below; over Chronbach' α=.787. To analyze materials, reliability analysis, multiple-regression and path analysis were used as statistic analysis techniques. The conclusion based on above study method and the result of material analysis are here below. First, instructors' support influences on the satisfaction of the participation at the commercial sports center. Second, instructors' support influences on the adherence of the participation at the commercial sports center. Third, the satisfaction influences on the adherence of the participation at the commercial sports center. Fourth, there exists significant casual relationship among instructors' support, satisfaction, and adherence of participation.

미분말 고로슬래그를 이용한 고강도 콘크리트의 개발

심도식,이봉학,홍창우,김남윤,윤경구,김동호 강원대학교 석재복합신소재제품연구센터 1998 석재연 논문집 Vol.3 No.-

본 연구는 철강석의 정제후 부수적으로 발생하는 고로슬래그 미분말을 건설분야에 이용하여 고강도콘크리트를 제조하고 이에 대한 여러 가지의 역학적 특성을 알아보고자 하는 것이다. 실험의 주요인자로서 물/시멘트비, 굵은골재의 최대치수 및 시멘트의 종류로서 슬래그시멘트와 보통시멘트를 비교하였으며 제조된 콘크리트의 경화전 특성 실험으로는 슬럼프, 공기량, 응결시간을 측정하고 경화후 압축강도, 할렬인장강도, 휨강도 및 동결-융해 저항특성 실험을 수행하였다. 실험결과 슬래그시멘트와 19mm골재를 사용하고 물/시멘트비가 낮은 경우 높은 강도 발현은 물론 500cycle 이후에서도 상대동탄성계수가 90%이상을 나타내어 동결-융해에 대한 저항성이 매우 우수함을 나타내었다. 또한 슬럼프 경시변화에서도 보통시멘트를 사용한 콘크리트에 비해 슬럼프 손실률이 상당히 적어 유동성을 확보한 고강도 콘크리트의 생산이 가능함으로써 건설분야에 활용될 수 있을 것이다. The purpose of this study is to make high strength concrete using blast furnace slag and is to know the mechanical properties about it. Major variables of experiment are the water/cement ratio, coarse aggregate maximum size, portland and slag as cement type. After measuring of slump, air content and setting time about fresh concrete, compressive, tensile and flexible strength test and freezing-thawing resistance test also were carried out about hardend concrete. The results of test showed a good resistance to become higher than 90% of a relative modulus of elasticity after 506cycles and more strength in case of lower water/cement ratio and coarse aggregate of 19mm with slag cement. Also, concrete using blast furnace slag will make practical application of construction field to be high strength concrete, a small slump loss.

스키시즌권 구매자들의 스키장별 선호도 조사

장현철,김경식,방준현,최천진,엄정식,김응준,이루지 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.2

The purpose of this study was to examine the perception and preference of skiers in a bid to provide ski resorts with useful information about successful positioning strategy. The subjects in this study were 9,722 skiers who purchased season tickets from N web site that sold ski season tickets. Their online purchasing route and page view were analyzed to find out what factors affected their purchase of ski season tickets. The findings of this study were as follows: First, 78 percent of the people investigated were make, and 22 percent were female. By age, the largest group was in their 20s(5,344 skiers), followed by those in their 30s(3,434), those in their 40s(631) and teenagers(229). Second, their page view rate with Yangji recorded highest with 24%, followed by Sungwoo Resort with 23% and Chonmasan with 13 percent. Third, by geographic area, the skiers from southern Gyeonggi province bought the largest number of tickets for the 2002/2003 season, followed by Gangweon province residents and northem Gyeonggi province dwellers. In the case of the 2003/2004 season, those from Gangweon provinece pruchased the most tickets, followed by southern Gyeonggi province dwellers and north Gyeonggi province residents.

비정형 향정신병약물을 투여 중인 정신분열병 환자의 주관적 삶의 질 : 정신병리, 약물 부작용 및 약물에 대한 주관적 반응과의 관련성

김종훈,윤정희,이자영,노경희,홍성극,윤세창,강웅구,김용식 大韓神經精神醫學會 2003 신경정신의학 Vol.42 No.2

Objectives : The purpose of this study was to evaluate the characteristics of psychopathology, adverse drug effects, and Subjective response to drugs that have a significant impact on the subjective quality of life in schizophrenic patients receiving atypical antipsychotics. Methods : One hundred and one schizophrenic patients, who were receiving maintenance treatment with atypical antipsychotics, were evaluated. Subjective quality of life was assessed using the standardized Korean modification of a self-rating scale to measure subjective well-being under neuroleptics (KmSWN). Patients' psychopathology was evaluated using the Positive and Negative Syndrome Scale. Adverse effects and subjective response to drug were evaluated using the Liverpool University Neuroleptic Side Effect Rating Scale and the Drug Attitude Inventory-10, respectively. Correlation analysis and stepwise multiple regression analysis were conducted. Results : In psychopathology, the severity of depression and anxiety showed the most significant correlation with the score ofKmSWN. In adverse drug effects, the severity of psychic side effect and extrapyramidal side effect showed the most significant correlation with the score ofKmSWN. Regarding subjective response to drug, significant correlation was observed between the severity of subjective negative response and the score of KmSWN. Stepwise multiple regression analysis revealed that psychic side effect, extrapyramidal side effect, and depression contributed significantly to the total score of KmSWN. These variables accounted for 59.7% of the total variance. Conclusion : The results of the present study suggest that psychic side effect, extrapyramidal side effect and depressive symptom are the clinical characteristics that are significantly associated with the subjective quality of life. An effective management strategy for these variables should be established in developing a treatment program to enhance the quality of life of patients with schizophrenia.

뇌수술 시 과호흡과 만니톨의 투여가 뇌혈류와 뇌산소대사에 미치는 영향

김지헌,김경식,문봉기,조경기,신용삼,이영주,김진수 대한마취과학회 2002 Korean Journal of Anesthesiology Vol.43 No.4

Background: There are therapies to lower intracranial pressure (ICP) including head elevation, hyperventilation, diuretics injection, intravenous mannitol, hypothermia, cerebrospinal fluid drainage, and cerebral resection in neurosurgical patients. However in recent reports, hyperventilation followed by mannitol administration may lead to cerebral ischemia. Therefore, we investigated the effect of 0.5-1.0 g/kg mannitol administration on jugular venous oxygen saturation (SjVO_2) and cerebral arterial-jugular venous oxygen content difference (AVDO_2) at PaCO_2 25-30 mmHg and 35-40 mmHg in patients undergoing neurosurgery. Methods: we studied 17 patients undergoing neurosurgery in the Ajou University Hospital. Anesthesia was induced with fentanyl, midazolam, thiopental, and vecuronium, and maintained with )_2-Air-Isoflorane, a continuous infusion of fentanyl, and vecuronium. Patients were divided into two groups. Group 1 (n = 10) which is PaCO_2 25-30 mmHg and Group 2 (n = 7) which is PaCO_2 35-40 mmHg by controlling ventilator. Measurements of SjVO_2 and AVDO_2 in following time intervals: Ⅰ = preinjection of mannitol, Ⅱ = postinjection 20 minutes of mannitol, Ⅲ = postinjection 40 minutes of mannitol were obtainde for each group. 0.5-1.0 g/kg mannitol was administered intravenously just at duramater opening. Results: Hemodynamics and hematologics were not significantly different among the two groups. SjVO_2 of each group are as follows; Group 1; Ⅰ (70.3 ± 8.1%), Ⅱ (66.3 ± 6.9%), Ⅲ (69.1 ± 7.9%) and Group 2; Ⅰ (78.6 ± 7.4%), Ⅱ (75.1 ± 8.1%), Ⅲ (76.0 ± 11.2%), Hyperventilation significantly decreased SjVO_2- AVDO_2 was not significantly different but SjVO_2 in Ⅱ was significantly decreased compared with Ⅰ and Ⅲ in Group 1 (20% patients). Conclusions: Mannitol produced a change of SjVO_2 during hyterventilation. Therefore, intravenous mannitol during hyperventilation should be given cautiously according to the patients status because it may cause cerebral ischemia in critical patients. (Korean J Anesthediol 2002; 43: 462~467)

Relationship between Leisure Constraints Negotiation, Serious Leisure and Specialization of Sports Activity

Kyong-sik Kim,Kyong-ja Koo,Eun-joo. Lee 한국콘텐츠학회 2010 ICCC International Digital Design Invitation Exhib Vol.2010 No.12

Relationship between Leisure Constraints Negotiation, Serious Leisure and Specialization of Sports Activity

Kyong-sik Kim,Kyong-ja Koo,Eun-joo. Lee 한국콘텐츠학회 2010 한국콘텐츠학회 종합학술대회 논문집 Vol.2010 No.12