• Speech Sciences
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• v.10 no.2
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• pp.111-128
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• 2003

Aerodynamic study is valuable information about the vocal efficiency in translating airflow to acoustic signal. The purpose of this study was to investigate the differences between trained singers and untrained controls under different two pitch by simultaneous using the airway interruption method and electroglottography (EGG). Under singing a Korean lied 'Gene', 20 (Male 10, Female 10) trained singers were studied on two one-octave different tone. Mean flow rate (MFR) , subglottic pressure (Psub) and intensity were measured with aerodynamic test using the Phonatory function analyzer (Nagashima Ltd. Model PS 77H, Tokyo, Japan). Closed quotients (Qx), jitter and shimmer were also investigated by electroglottography using Lx speech studio (Laryngograph Ltd, London, UK). These data were compared with those of normal controls. MFR and Psub were increased on high pitch tone in all subject groups. Statistically significant increasing of Qx and intensity were observed in male trained singers on high pitch tone (Qx;p = .025, intensity;p < .001). Beacasue of increasing of Qx and intensity, vocal efficiency was also significantly increased in male singers (p < .001). The trained singers' phonation was more efficient than untrained singers. The result means that the trained singers can increase the loudness with little changing of mean flow rate, subglottic pressure but more increasing of glottic closed quotients.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2008.11a
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• pp.391-392
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• 2008

최근 나노 금속의 대량 생산에 대한 기술이 확보됨에 따라, 메탈젯을 이용한 연구가 활발히 진행되고 있다. 메탈젯의 연구 범위는 RFID, PCB, MLCC 전극, 태양전지전극, PDP 전극, EMC용재료 등 그 응용 범위를 넓혀 가고 있다. 이러한 응용 기술 대표적인 배선형성 기술인 PCB 제조에 대한 연구는 40um 이하의 고해상도 기판 개발을 요구하고 있다. 선폭은 40um 이하를 유지하면서, 두께는 10um 이상으로 CCL을 대체 하기 위한 기판 형성 기술은 응용기술은 가장 어려운 난이도의 기술이다. 메탈젯 기술은 매우 복합적인 연구분야로 나노 재료의 개발, 인쇄공정의 개발, 기재 표면처리 기술, 헤드 기술의 개발을 동시에 만족할 때 가능하다. 배선 형성을 위하여 나노 잉크를 이용하여 직접 인쇄를 진행하고, 소결하여 전도성을 얻게 된다. 본 연구에서는 미세노즐에 토출 가능한 잉크젯용 잉크 조성을 결정하고, 기판과의 신뢰성을 확보하기 위하여 접착력의 평가, 전도도의 평가, 건조 시간 조절을 통한 Crack 문제 해결, 미세 선폭의 균일성 조절에 관한 실험을 진행하였다.

• Journal of the Korean earth science society
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• v.25 no.4
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• pp.222-231
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• 2004

The purpose of this study is to analyze the seventh curriculum textbooks and teacher's guides of high school science courses in relation to the generation (mechanism) of magma in subduction boundary and find the incorrect descriptions of the texts and the figures (illustrations) and then suggest some improved schemes. According to the result there are many discrepancies in definition of 'magma' among the textbooks and further little scientific explanations about the formation mechanism of magma in most textbooks, and even no descriptions about that. In addition, the figures are inconsistent with the description of the text and also have some incorrect depiction which might contribute to the forming and reinforcing misconceptions about Plate Tectonics as well as a volcanic activity in subduction boundary. On the basis of the previous researches, therefore, some improved schemes (text descriptions and figures) are suggested. The results of this study should be used as a reference for publishing science textbook, developing science curriculum, and teaching effectively in the high school.

• Journal of the Korean earth science society
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• v.28 no.4
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• pp.462-477
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• 2007

The purpose of this study is to determine the petrology of basalt and the volcanic process in the Seondol cinder cone, Seobjikoji area, eastern Jeju Island. The Seondol cinder cone is mainly composed of spatters in the lower part, pyroclastic deposits including reddish brown blocks, ashes with volcanic bombs in the middle part, and dark black scoria deposits in the upper part. The volcanic sequences suggest volcanic processes that progress through Strombolian eruption and end with Hawaiian lava effusion which breached the cinder cone northwestward and extended over northwestward as lava delta and basalt emplaced as a volcanic neck in the central part of crater in the cinder cone. The age of basalt lava flows is about $95\;{\pm}\;3\;ka$. The basalts belong to transitional basalt and show products of fractional crystallization of clinopyroxene and olivine from a parental basalt magma on the basis of variation diagram of major, trace and rare earth elements. Basalts in the region of this study are plotted at the region of within plate basalt.

• Journal of the Korean earth science society
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• v.29 no.1
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• pp.13-28
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• 2008

About 450 specimens of Lockeia were discovered from the lacustrine siltstone of the Early Cretaceous Jinju Formation of Jin Island, southern coast of Korea. They are very elongated, seed-shaped Lockeia characterized by a large size, mostly 60-70 mm long and 15-20 mm wide. They are characteristically sharp longitudinal furrow bounded by steeply inclined both margins, elevated marginal rims and sharp pointed both longitudinal furrow ends. This trace fossil is herein described as Lockeia gigantus ichnosp. nov. Plicatounio, a freshwater bivalve which does not occur occurs occasionally within Lockeia gigantus is regarded as the most-likely producer of this resting trace fossil. This new trace fossil represents the largest Lockeia ever known and the first record of Lockeia from the Cretaceous non-marine deposits in the world. This fossil also represents an unusual example of resting trace fossil (Lockeia) associated with a possible producer (bivalve Plicatounio) lived in community in the shallow lacustrine environment.

• Korean Journal of Occupational Health Nursing
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• v.2
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• pp.52-59
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• 1992

본 연구는 예방적 건강행위에 대한 필요성 인식 정도와 실천정도를 파악하고 이를 요인분석하여 산업장의 예방적 건강행위를 이끌기 위한 프로그램의 기틀을 세우기 위해 시도되었다. 연구도구는 참고문헌과 선행연구 등을 참조하여 본 연구자가 만든 설문지를 사전 조사후 수정, 보완하여 사용하였다. 연구대상은 경기도 소재의 2개 기계제조업체에 근무하는 근로자들이였으며 1989년 5월 5일부터 10일까지 자료를 수집하였다. 수집된 자료 중 탈락 및 기재가 불충분한 질문지를 제외한 284명의 응답자를 분석에 사용하였다. 자료분석은 SPSS를 이용하여 전산처리하였으며, 연구결과는 다음과 같다. 1) 예방적 건강행위의 필요성 인식정도의 평균은 122.1점으로 매우 높은 점수분포를 나타냈으며, 실천정도의 평균은 87.6점으로 필요성 인식정도 보다는 낮은 실천정도를 나타냈었다. 2) 예방적 건강행위에 대한 필요성 인식정도와 실천 정도간의 상관관계를 분석한 결과 29개 예방적 건강행위 중 20개의 항목에서 통계적으로 유의한 상관관계를 보였다. 이것을 예방적 건강행위에 대한 필요성 인식정도가 높을수록 실천정도가 높은 것을 의미하는 것으로 인식정도가 행위에 영향을 미침을 반영하고 있다. 3) 요인분석결과 29개의 예방적 건강행위 항목들은 7가지의 요인으로 범주화되었으며 각 범주들은 요인부하량이 높은 것들을 참고로 하여 보건의료자원활동을 통한 예방적 건강행위, 개인위생에 대한 예방적 건강행위, 작업과 관련된 건강행위, 식습관을 통한 예방적 건강행위, 휴식을 통한 예방적 건강행위, 기호습관(금연, 금주)을 통한 예방적 건강행위, 활동을 통한 예방적 건강행위등으로 명명할 수 있었다. 결론적으로 생산직에 종사하고 있는 근로자들은 예방적 건강행위에 대한 필요성을 깊이 인식하고 있으나, 실천정도는 그에 미치지 못하고 있었다. 그러나 예방적 건강행위의 필요성 인식정도와 실천정도간의 상관관계에서 29개 항목중 20개 항목에서 유의한 상관관계를 보여 인식정도가 높을 수록 실천정도가 높은 것으로 나타났다. 이는 근로자의 건강에 대한 인식 및 태도가 가장 직접적으로 영향을 미칠 수 있는 산업간호사의 역할 중 보건교육에 대한 업무가 보다 중요한 비중으로 수행되어져야 함을 시사하는 결과라고 볼수 있다.

• Spatial Information Research
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• v.21 no.5
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• pp.23-32
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• 2013

The work establishing effective development and conservation plan and identifying current usage of national territory is an important task of the nation. In spite of the investigation being executed by law up to about 60 different, collecting information, method and time are different between them, so it causes duplication of the budget and policy confusion. And land use listed in the cadastral book officially represents the status of land use, but it is not easy to change according to current use. Therefore collection and information in a consistent manner is necessary to build up. In this study, for the national territory including public waters and underground space, we would like to analyse current land use information collection method and suggest system construction, legal system improvement and information utilization strategies. For the accurate and consistent land management, as a result, 3 dimensional land(include underground, public water and sea etc.) use status inspection and information management is needed. And the new act should be enacted and exclusive organization also be designated.

• Transactions of the Korean Society of Mechanical Engineers
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• v.10 no.1
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• pp.34-42
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• 1986

An interface of a circular arc formed by two isotropic, homogeneous elastic materials is investigated. It is shown that L integral satisfies the conservation law for the interface if it is perfectly bonded, in frictionless contact or separated such as in a crack with the origin of the coordinate system being located at the center of the circular arc. The property of path independence of the L integral is applied to an interfacial crack problem, to obtain the stress intensity factors, where the interfacial crack is located along the arc of the circular inclusion embedded in infinite matrix. It is assumed here that the contact zone exist as in the model proposed by Comninou, thus removing the overlapping of the materials along the interface. Another example is shown for case of a circular interfacial crack in the matrix of finite size, where the stress intensity factors are determined by computing a value of the L integral numerically along the path far from the crack tip.

• Journal of Preventive Medicine and Public Health
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• v.29 no.2 s.53
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• pp.227-238
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• 1996

This study was conducted to evaluate the accuracy of the official death registry in rural area. The base data used for the study was 379 deaths registered during the period of 1993 and 1994 in 4 rural townships of Chonnam province. The interview survey for cause-of-death was performed on the next of kin and/or neighbor. Additional medical informations were collected from hospitals and medical insurance associations for the purpose of verification. The underlying cause-of-death of 278 cases presumed by the survey was compared to the cause on official death registry. There was a prominent disagreement of cause-of-death between the survey data and the registry data(agreement rate: $38.9\sim44.6%$, according to disease classification method). These results may be caused by extremely low rates of physicians' certification, which were mostly confined to the poisoning and injury. Symptoms, signs, and ill defined conditions on death registry could be classified into circulatory disease(32.3%), neoplasm(21.2%), digestive disease(7.1%), injury and poisoning(7.1%) and so on. These results suggest that careful attention and verification be required on utilization of death registry data in rural area.

• Applied Chemistry for Engineering
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• v.18 no.2
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• pp.142-147
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• 2007

In this study, mesoporous tin oxide was synthesized by sol-gel method using $C_{16}TMABr$ surfactant as a template in a basic condition. The optimum conditions for the synthesis of mesoporous $SnO_2$ were investigated and the obtained samples were characterized by XRD, nitrogen adsorption and TEM analysis. A mesoporous and nanostructured $SnO_2$ gas sensor with Au electrode and Pt heater has been fabricated on alumina substrate as one unit via a screen printing process. Sensing abilities of fabricated sensors were examined for CO and $CH_4$ gases, respectively, at $350^{\circ}C$ in the concentration range of 1~10,000 ppm. Influence of loading amount of palladium impregnated on $SnO_2$ was also tested in detection of those gases. High sensitivity to detecting gases and the fast response speed with stability were obtained with the mesoporous tin oxide sensor as compared to a non-porous one under the same detection conditions.