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      • KCI등재

        아두이노를 활용한 초음파 간섭 실험

        이경석,이희복,이경석 한국현장과학교육학회 2020 현장과학교육 Vol.14 No.4

        아두이노(Arduino)는 중·고등학생들도 손쉽게 다양한 실험 장치를 직접 제작할 수 있도록 해주는 유용한 도구이다. 우리는 아두이노를 활용하여 초음파 스피커로부터 방출되는 음파를 스캔하여 공간에 형성된 음압을 정량적으로 측정할 수 있는 1차원 초음파 스캐너를 만들었다. 이 실험 장치를 활용하여 스피커로부터의 거리 및 방향에 따라 음압이 어떻게 변화하는지를 확인하고, 하나의 스피커가 형성하는 음파의 모양과 두 개의 스피커를 동시에 작동시켰을 때 나타나는 초음파 간섭무늬를 정량적으로 측정하고 물리 이론으로 설명하였다. 또한, 두 음원의 위상차에 의한 효과 및 반사에 의한 영향도 알아보았다. 이 초음파 간섭 실험 장치는 중등교육현장에서 음파의 물리적 특성 및 파동의 간섭 현상의 교육에 활용이 기대된다. With the ample resources provided by Arduino, it is easy to implement a variety of experimental apparatus even for secondary school students. Using Arduino, we made an 1D ultrasonic wave scanner, which can quantitatively measure sound pressure in space by scanning sound waves from speakers. With this scanner, we examined how sound pressure changes according to the distance from and the direction of a speaker, and therefore could probe the acoustic fields. Likewise, we also measured the interference patterns from two speakers and explained the result with theory. Even more, we checked the effects of the phase differences and the reflection of sound waves. This experimental setup, along with the aforementioned activities, is expected to be very helpful in teaching physical properties of sound waves and interference in secondary schools.

      • SCOPUSSCIEKCI등재

        급성과 진구성 흉요추 압박골절의 감별 : 판독 일치율 Observer Agreement

        이경석,배원경,조원수,도재원,배학근,윤일규 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.7

        Differentiation between acute and old fractures in the thoracic and lumbar spine is often difficult. We have evaluated the intraobserver agreement and interobserver variability of interpretations. We have prepared 50 cases from 40 patients with thoracic or lumbar spine fracture for evaluation. At first, two radiologist interpreted each of the 50 cases. only by using plain roentgenograms. Then, they interpreted the cases again using also spine CT. HRI. bone scintigrams and follow-up roentgenograms. Intraobserver agreement was found to be 78% in Doctor A, and 76% in Doctor B, Interobserver agreement was only 62% at first. It was 88, when they used CT, MRI, bone scintigrams and follow-up roentgenograms. It was not easy to differentiate the old fractures from acute one only by plain roentgenograms. Differentiation was more difficult. when the patient was female or over 55 years old Plain roentgenography in hyperextension posture seems to be a simple but useful method for the diagnosis of the acute fracture. MRI was more valuable than CT or bone scintigraphy to differentiate the old fractures from the acute ones.

      • 현대건축에서의 계단/램프의 표현방식과 의미확장에 관한 연구

        이경석,심우갑 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.2

        The purpose of this study was to show the change of idea about stair/ramp by analyzing form and meaning of vertical-passage designed by contemporary architects. That was the spatial expression of 'deconstruction' pursued by modern avant-garde. Thus architectural grounds for it were divided into external shape according to the linkage types of vertical spaces and internal meaning according to the programs. That analysis proposed the enlarged possibility of formative design.

      • 중동지역 무역협상에 관한 연구

        이경석 광운대학교 디지털경영연구소 2003 디지털 경영연구 Vol.9 No.-

        중동 이슬람지역은 서구사회와는 달리 이슬람 종교가 이들 의식구조의 중핵을 이루고 있으며, 모든 행위나 사고도 종교교리에 따르는 이질문화권의 사회이다. 이들은 종교적 관념이 가치기준의 척도이고 이상적 관념의 핵심이 되고 있다. 그러므로 종교적 이유가 없는 정당성과 전통성은 있을 수 없다고 생각한다. 중동이슬람 사회에서는 국제관습이 종교에 위배되면 이를 무효로 하는 특이한 사회이다. 중동인들은 의심이 많고 과장된 표현으로 자신을 보호하려 하며, 무역 협상시 자기 주장이 강하고 매사 자기 위주로 해석하며 행동한다 이들은 시간관념이 없고 모든 것을 신의 뜻에 따르려 하며, 상대방이 시간에 쫓길 때 어부지리를 얻으려 한다. 이들은 우선 상대방과의 유대감 형성에 많은 시간을 할애한다. 그러므로 이들과 친밀성을 높이고 믿음을 주는 것이 협상을 성공 마무리할 수 있다. The Middle East forms quite different cultural area from the Western cultures. The Middle East adheres the commercial customs and practice originating from the Islamic doctrines by Prophet Muhammad. The Islam dominates consciousness of Middle Easterners as well as their way of thinking and deeds. The commercial customs and practice in the Middle East shall also conform to the Islam, which rejects any int'l customs and practice contradicting them. In order to facilitate trade with Middle Easterners, trade partners shall get used to prior understanding of the Islamic doctrines, and get accustomed to their consciousness, sense of value and peculiar customs and practice. Middle Easterners are fully dubious, strongly argue their opinions, and judge in their favor. They never consider their lives without the Islam. Accordingly we had better reinforce familiarity and enjoy reputation through close relationship with them. Priority is, above all, being given to the same coincidence as the Islam predominates others, which we shall bear in mind.

      • 옥외광고업계 종사자를 위한 디자인 교육과정 개발

        이경석 한경대학교 2003 論文集 Vol.35 No.-

        The current city landscapes that the national priorities of economic development and rapid industrial development have brought us, are not evaluated as exclusively. Making improvements in public design is the right direction for the pressing issues of signs and landscape when making a international city. Signs can determine regional environments and identity. It's necessary to set guidelines for the size, structure, color, and space of buildings for the improvement of both sign and landscape design and related education and studies have to be followed. For this reason, the thesis will propose ideal sign design curriculum models based on practical and actuality

      • SCOPUSSCIEKCI등재

        급성 경막하혈종 : 183 수술례 분석 Analysis of 183 Operated Cases

        이경석,배학근,윤일규 대한신경외과학회 1992 Journal of Korean neurosurgical society Vol.21 No.8

        We present a series of 183 operated acute(within 24 hours) subdural hematomas from 1985 to 1991. All were diagnosed by computerized tomography. The primary causes of acute subdural hematoma were passenger's traffic accident(36.6%), pedestrian accident(31.7%), fall or slip(16.4%), and assaults(2.7%). A favorable outcome(good recovery and moderate disability) occurred in 31.7%, an unfavorable outcome(severe disability and vegetative state) in 11.5%, and a death resulted in 56.8% at discharge. Preoperative Glasgow Coma Scale score(GCS) and pupillary status were major clinical predictors of prognosis. Age, sex, operative timing, severity of associated extracranial injury, and blood pressure on arrival did not significantly affect on the prognosis. As radiological predictors, degree of midline-shift, presence or absence of skull fracture, status of perimesencephalic cistern or third ventricle were significantly correlated with outcome. Size of the hematoma and presence or absence of combined intracranial focal lesions did not reflect a significant difference in the outcome.

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