건축공사시방서에서의 KS규격의 국제인증방안에 관한 연구

김경식,이재섭,김용수,이규진,조용훈,최완철,전재열,이현수,구재동,이기환 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1

The purpose of this research is make out construction specifications for International Construction. Using off-shore products incur cost increase and longer delivery term of construction. and inconvenient on International Construction. Expand the range of additional local products conforming to performance. Life Cycle Cost. maintainability. operability. user's acceptability, etc.. And this study is suggest the standard formats and the techniques for construction specification.

다발성 외상시 응급 초음파검사의 의의

이강현,임경수,김선만,김영식,황성오,유수영,강성준 대한응급의학회 1995 대한응급의학회지 Vol.6 No.1

The Evaluation of blunt abdominal trauma is clinically challenging. Abdominal computed to-mography(CT) and diagnostic peritoneal lavage(DPL) has become primary diagnostic modali-ty in advanced trauma life support(ATLS). But DPL is invasive study with potential for the patients. Monitoring and resuscitation are usually suboptimal during there examinations. We examined the efficacy and role of emergency ultrasonographic(US) studies in the initial abdominal evaluation of blunt trauma patients. A prospective study was carried out on 101 blunt trauma patients from 1994, June to September. 101 patients underwent real-time US ex-amination of the chest and abdomen. Indication for emergency US included the cases of shock (systolic blood pressure<90mmHg) or tachycardia (pulse rate/min.>100) in blunt trauma pa-tients. US showed a sensitivity of 96.2%, specificity 98%, accuracy 97% in regard to indica-tion for surgery in case of blunt abdominal or thoracic trauma. US saves time, and it can be performed during the emergency care in the emergency department. US showes high sensitivity and specificty, and is the method of first choice in the evaluation of blunt trauma.

심폐소생술중 심실기능 및 판막운동의 평가

이부수,김영식,이강현,황성오,임경수,박금수,윤정한,안무업,최경훈 대한응급의학회 1994 대한응급의학회지 Vol.5 No.2

Background : Mechanism of blood flow during cardiopulmonary resuscitation(CPR) in humans remains controversial and poorly understood, although cardiac or thoracic pump theory was proposed. We investigated cardiac movement, ventricular function and atrioventricular valve motion with aid of transesophageal echocardiography during precordial compression during CPR in humans. Methods and results : During CPR transesophageal echocardiography was performed in 14 patients with non-traumatic cardiac arrest. Manual precordial compression during CPR was performed according to American Heart Association guidelines. Mitral valve closed in 9 and did not close in 5 patients during "compression systole". Tricuspid valve closed during compression systole. Compression vector directed to right ventricle, basal portion of interventricular septum and left atrium. The heart rotated clockwise and the apex was more displaced than the base("swing motion"). Fractional shortening(FS) and ejection fraction(EF) of right ventricle exceeded those of left ventricle(FS : 55±9% vs 18±8%, p<0.05), EF : 79±9% vs 37±16%, p<0.05). FS and EF of left ventricle was higher in patients with systolic mitral valve closure than patients with persistent systolic opening of mitral valve(FS : 21±7 vs 13±7%, EF : 45±12 vs 22±12%, p<0.05), but FS and EF of right ventricle was not different. Conclusion : During precordial compression, the heart rotated clockwise and displaced. Systolic function of right ventricle exceeded left ventricle. Marked compression of right ventricle and systolic closure of tricuspid valve suggested that right ventricle functioned as a pump generating blood flow during precordial compression. Closure of mitral valve was dependant on systolic function of the left ventricle.

실수행렬을 위한 Jacobi-CORDIC 고유치 분해법의 구현

이경선,이동열,정봉식 동아대학교 공과대학부설 정보통신연구소 2007 情報技術硏究所論文誌 Vol.15 No.1

n this paper, the eigenvalue decomposition (EVD) algorithm of the real correlation matrix for unitary MUSIC (MUltiple SIgnal Classification) is implemented using Xilinx’s system generator tool. The Jacobi-CORDIC (COrdinate Rotation DIgital Computer) algorithm, which is applied to obtain the eigenvalue and eigenvector of the real matrix, has the advantage of the easy implementation. The simulation results show that the fixed-points results of system generator agree well with floating-points ones of Matlab .

특수형 방사성 동위원소 운반캡슐의 안정성 평가

이주찬,서기석,구정회,방경식,한현수,박성원 대한방사선 방어학회 2001 방사선방어학회지 Vol.26 No.1

특수형 방사성물질 운반캡슐은 국내외의 수송관련 법규에 규정된 기술기준을 만족하도록 설계, 제작되어야 한다. 본 연구의 목적은 하나로에서 생산된 192Ir 특수형 동위원소 운반캡슐의 건전성을 평가하는데 있다. 법규에서 규정된 낙하시험, 타격시험, 굽힘시헝 및 가열시험조건에 대한 안전성 시험을 수행하였으며, 각각의 시험 전후에 누설시험을 수행하였다. 또한, 안전성시험과 더불어 컴퓨터코드를 이용한 전산해석을 수행하여 안전성시험 전에 시험결과에 대한 예측자료로 활용되었다. 낙하시험 및 가열시험 결과 캡슐 표면에서 약간의 흠집과 변형이 발생하였으나, 각각의 시험에서 평가기준이 되는 캡슐의 손상이나 용융 등은 발생하지 않았다. 또한 각 시험 후 수행한 누설시험 결과 누설이 발생하지 않았다. 따라서 특수형 방사성물질 운반캡슐은 법규에서 규정하는 기술기준을 만족하도록 설계, 제작되었음이 입증되었다. All of sealing capsules to transport a special form radioactive material should be designed and fabricated in accordance with the design criteria prescribed in IAEA standards and domestic regulations. The objective of this study is to demonstrate the safety of a shipping capsule for 192Ir special form radioisotope which produceed in the HANARO. The safety tests were carried out for the impact, percussion, bending and heat test conditions. And leakage tests were carried out before and after the each test. Also, the safety analyses were performed using computer codes in order to verify the test results. The capsule showed slight scratches and deformation, and maintained its structural and thermal integrities in all tests without any severe damage or melting. It also met the allowable limits of leakage rate after earth test. Therefore, it has been verified that the capsule was designed and fabricated to meet all requirements for the special form.

저항을 이용한 프로판-공기 혼합가스의 점화한계 개선에 관한 연구

이춘하,오종용,옥경재,지승욱,이광식,심광렬 한국화재소방학회 2004 한국화재소방학회논문지 Vol.18 No.1

본 논문은 IEC형 불꽃점화 시험장치를 이용하여 저압 유도회로의 최소 점화한계를 프로판-공기 5.25 Vol.%의 혼합 가스에 대하여 실험적으로 구하였으며, 또한 유도회로의 인덕턴스 L에 안전소자로서 저항을 병렬접속하였을 경우 프로판-공기 5.25 Vol.%의 혼합 가스에 대한 점화한계 개선효과를 관찰하였다. 그 결과, 최소 점화한계는 전류의 크기에 따라 좌우되었다 또한, 전원으로부터 공급되는 에너지는 인덕턴스에 우선 축적되고. 그 초과분의 에너지가 폭발성 가스의 점화원으로 작용하였다. 점화한계 개선효과는 인덕턴스가 300 mH일 때, 최고 330%의 개선효과가 나타났으며 인덕턴스가 클수록 점화한계 개선효과가 크게 나타났다. 또한 병렬로 접속한 저항의 크기가 적을수록 점화한계 개선 효과가 크다. 본 연구결과는 본질안전 방폭형 전기기기의 연구개발을 위한 기본자료로 활용할 수 있을 뿐만 아니라 이들 기기의 방폭성능에 대한 시험자료로도 활용이 가능할 것으로 사료된다. This paper describes the minimum ignition limits for propane-air 5.25 Vol.% mixture gases in low voltage inductive circiuts. The improved effects on the ignition limit are studied by parallel safety components(resistors) for propane-air 5.25 Vol.% mixture gas in low voltage inductive circuits. The experimental devices used in this test are the IEC type spark ignition test apparatus. The minimum ignition limits are controlled by the values of current in inductive circuit. Energy supplied from elect source is first accumulated at the inductance, it's extra energy is working as ignition source of the explosive gas. The improved effects on the ignition limit are respectively obtained as the maximum rising rate of 330% by composing parallel circuits between inductance and resistor as compared with disconnecting inductance with the safety components. The more values of inductance increase the higher improved effects of ignition limit rise. The less values of resistor the higher improved effects of ignition limit rise. It is considered that the result can be used for not only data for researches and development of intrinsically safe explosion-proof machines which are applied equipment and detectors used in dangerous areas but also for datum for its equipment tests.

노인외상환자의 외상중증도계수와 동통감지력의 변화에 대한 임상적 고찰

이진웅,임경수,김영식,황성오,이강현,김선만,김 현 大韓應急醫學會 1996 대한응급의학회지 Vol.7 No.1

Because elderly individuals are participitating in social work as adult inspite of their physical handicapes such as hearing difficulty, visual difficulty and limit of motion, they are continually exposed to the risk of injury. Trauma is now fifth cause of death in elderly of over 65 years old, and the elderly suffer disproportionately high injury-related motality comparing with younger adults. In addition, sometimes elderly patients don`t complaint of pain on injured site because of high threshold to pain. We studied about occurence of neglected injury due to high threshold to pain in geriatric trauma patients. When we diagnosised injury that patients did not complaint of pain on injured site through physical examination and radiologic examination, we defined that as neglected injury. There were 8 (8%) geriatric patients who didn`t complaint of pain on injured site on admission to emergency center, but only 0.7% of adult patients had neglected injury. The severity was estimated by use of AIS(Abbreviated Injury Scale), and the severity of all neglected injuries were above AIS 2 point. The neglected injury were head injuries(4 in number), abdominal injury(1), pelvic injuries(2) and extremity injury(1). So if geriatric trauma patients were admitted to emergency center, we recommand full physical and radiological examinations although patients don`t complaint of pain.

선천성 엽성 폐기종 2예

임경심,이경일,이현미,전정식,조건현 최신의학사 1988 最新醫學 Vol.31 No.1

법량질 표면의 탈회 및 재광화 후 EPMA (electron probe micro-analysis)를 이용한 칼슘, 인, 불소 변화의 정량적 분석

홍경식,허복,이찬영,금기연 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.5

The aim of this in vitro study was to analyze the composition of human tooth enamel in terms of there components, Ca, P, and F after demineralization and remineralization in acid buffer solution. A total of 8 human premolars without any defects and cracks were selected and buccal and lingual sides of the teeth were cleaned with an ultrasonic device and pumice without fluoride. 5×5mm windows were opened, and other areas were completely covered with 3-coats of nail varnish to prevent from being in contact with demineralized and remineralized solutions. After demineralization process, each tooth was sectioned into two slices, highly polished one of them withγ-alumina, and then analyzed the composition of the demineralized tooth with EPMA(electron probe micro-analyzer) . The ocher slices were put into the remineralized solution for 10 days, polished, and analyzed in the same manner. These data were statistically analyzed with one sample t-test(p<0.05) . The results were as follows. 1. Normal tooth enamel consists of 49.76% Ca, 39.80% P, and 0.28% F. 2. After demineralization, percentage of Ca and P ratio were decreased by about 5.57 and 5.07% respectively. Percentage of F ratio was also decreased by about 0.01%, which was not statistically significant. 3. After remineralization, percentage of Ca, P increased about by 4.47 and 4.35% respectively. Percentage of F decreased by about 0.01%, which was not statistically significant. In conclusion, remineralized solution used in our study has the potential to induce the uptake the Ca and P into the pore sites of the demineralized enamel. But, in the oral cavity, there were rapid temperature change, organic matrix that inhibits the movement of the ions, and limitation of continuous contact with this remineralized solution. Therefore, further in vivo study is necessary.

소비자의 노력 수준에 따른 보상물의 원산지효과에 관한 연구

김경식,조재욱,이석규 한국방송광고공사 2008 광고연구 Vol.0 No.80

This study attempts to identify the difference of consumer’s preference of rewards divided by image of country of origin. And to investigate the moderating role of consumer’s effort in country of origin effect. In the experiment, participants showed the highest preference when rewards which has positive image related to country of origin were offered, followed by rewards of neutral image, and ones of negative image. In addition, the difference of preference between rewards of positive image and ones of negative image was strongly influenced by a lower degree of consumer’s effort compared to a higher degree of it. Lastly, after controlling rewards of neutral image, the difference of preference between this and rewards of positive image was strongly influenced by a degree of consumer’s effort. But the difference of preference between that and rewards of negative image was not influenced by it. The results indicate that extrinsic cue, country of origin, which is the new concept on research of rewards program is the important factor for drawing consumer’s responses effective for company.