• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 춘계 학술발표회 논문집
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• pp.882-887
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• 2006

Sedimentological, geochemical, geophysical and micropaleontological analyses of 10 borehole cores were carried out to understand depositional environment and sequence stratigraphy of late Quaternary sedimentation in the estuary of the Nakdong River. Holocene Formation in study area is classified into five sedimentary units. Early Holocene freshwater lower pebbly sandy deposit(Unit I), lower muddy deposit(Unit II), middle thin sandy deposit(Unit III), upper muddy deposit(Unit VI), and upper sandy deposit(Unit V), in ascending order contolled by global sea-level change since interglacial period(about 15,000 yrs B.P.). Unit I deposited in erosional environments before marine trangression. Unit II and Unit VI composed of clay were deposited in cold and worm currents for marine trangression., respectively.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 C
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• pp.1049-1053
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• 1999

It is important to measuring and monitoring about state vectors of power system for precise operation control. All state vectors cannot be measured because it is economically disadvantageous, so that some state vectors are determined using state estimator. Determination of observability is a important precondition of power system state estimation because state estimation can be performed when given power system is observable. Recently as time-synchronization technique progress, using the PMU(Phasor Measurement Unit), state vector can be measured directly so that voltage phasor and current phasor measurements can be used for power system estimation. In this paper, observability algorithm is proposed to determinate the observability with real/reactive injection power measurements and real/reactive lineflow power measurements of existing measurement system and with phasor measurements of PMU. The jacobian matrix is newly composed for state estimation with measurements of added PMU, and state estimation is performed with least square estimatior. Comparison between state estimation result of existing measurement system and that of measurement system added PMU is presented.

• 한국정밀공학회지
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• 제29권3호
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• pp.313-318
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• 2012

Application of composite structures on naval ships strongly depends on the mechanical strength and collapse behavior of the T-joints of the whole structure. Because of the weight advantages over single skin composite and bolt fastening joining, three types of T-joints using both honeycomb sandwich composite and adhesive bonding were suggested to determine the effect of T-joint configuration. It was found that joining with a urethane foam block and overlaminates using the secondary co-bonding technique improves T-joint strength.

• 한국도로학회논문집
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• 제19권3호
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• pp.1-10
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• 2017

PURPOSES : This paper focuses on strength development according to the mix design with cement type and mineral admixture from laboratory and field tests in cool weather. METHODS : Two methods evaluated the mix design of concrete pavement in cool weather. Firstly, laboratory tests including slump, air contents, setting time, strength, maturity, and freezing-thawing test were conducted. Three alternatives were selected based on the tests. Secondly, a field test was conducted and the optimum mix design in cool weather was suggested. RESULTS : It is an evident from the laboratory test that a mix with type III cement showed better performance than the one with type I cement. There was a delay in strength development of a mix with mineral admixture compared to mix design without any mineral admixture. In the field test, type III cement+flyash 20% mix design proved the best performance. CONCLUSIONS : For concrete pavement in cool weather, mix design using type III cement could overcome the strength delay due to mineral admixture. Moreover, it is possible to make sure of durability of pavement. Therefore, strength and durability problems due to cool weather would decrease.

• Annals of Clinical Neurophysiology
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• 제8권2호
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• pp.190-192
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• 2006

Intracranial hypotension is a benign disorder characterized by orthostatic headache. It is caused by CSF leakage, therefore its treatment of choice has been epidural blood patch when initial conservative treatments were not effective. We would like to report a 26-year-old patient with recurrent orthostatic intracranial hypotension in spite of the successful epidural blood patch several times. Her headache was caused by myelography 8 month ago. Cisternography showed a CSF leakage at the level of L1 vertebral body. Headache was resolved completely after epidural blood patch and then recurred 3 times several months after blood patch. Now, she is free from headache for 5 months after last blood patch.

• 대한한의학회지
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• 제22권3호
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• pp.11-20
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• 2001

Objective: As early as 1967, professor Endre Mester's group published the first scientific report concerning the effects of low level laser therapy (LLLT) on the skin of rats. After that, there have been some two thousand research reports from many countries in which the biological effects of low level lasers have been demonstrated. We reviewed some theses about LLLT published in Korea recently, and we make a proposal concerning the new method of study using LLLT in Oriental Medicine. Methods: We have selected 12 medical theses about low level laser therapy published in Korean Oriental Medicine journals recently, reviewed them, and investigated their methods. Results and Conclusion: There were several clinical studies in Korea about hyperlipidemia, hypercholesteremia, hyperfibrinogenemia, hyperlipoproteinemia, headache, dizziness, stroke, pain and numbness published from 1996 to 2000 using LLLT. The number of theses of good quality is showing a tendency to increase, recently. Sooner or later LLLT will be a very useful treatment and we believe that it will be an alternative useful method in Oriental Medical fields. There have been some negative public opinions about LLLT voiced in the Korean Oriental Medical society recently, but we expect a positive re-evaluation of this new treatment within Oriental Medicine in the near future.

• 대한정형외과스포츠의학회지
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• 제2권2호
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• pp.176-180
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• 2003

저 자들은 관절와의 전위 된 횡골절에 대해 관절경 을 이 용하여 골절된 관절면을 확인하면서 골절의 정복을 유지 하고, 견관절경술식에 일 반적으로 사용되는 견봉 바로 외측에 위 치 한 외 측 삽입 구나 또는 견갑상와의 상부 삽입구 (Nevlaser porial)에서 피부를 통해 직경4 mm 타이타늄 유관 해면골 나사를 이 용하여 고정하였다. 관절경을 이 용한 골절 내고정술은 좋은 시 야를 확보할 수 있었고, 최소 침습 수술이므로 작은 연부조직 절개 , 적은 출혈량, 수술후 재활 기간의 단축 및 조기 관절 운동 힌용 등의 여러 장점 을 가지므로 이에 수술 방법과 증례를 보고하는 바이다

• 한국화재소방학회논문지
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• 제22권5호
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• pp.61-66
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• 2008

본 연구에서는 특정물질의 과열로 인한 이상 상태를 조기에 감지하여 화재 및 폭발로의 전이 위험성을 사전에 예방할 수 있는 방법 중 하나로 열변색 색소를 유효성분으로 한 겔성형체를 제조하여 그 특성을 평가하였다. 또한 과열감지용 대상물에 대한 적용성을 확대하기 위하여 성형체는 원료물질의 종류와 함량, 그리고 제조방법에 따라 점탄성형과 도포형의 2가지로 제조하였다. 변색성 시험, 점도 특성, 변색 개시시간, FT-IR 분석을 수행한 결과 이상 조건을 효과적으로 감지하여 변색 기능을 나타낼 수 있는 물질이 제조되어 다양한 응용이 가능할 것으로 사료된다.

• 열처리공학회지
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• 제21권6호
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• pp.281-286
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• 2008

In the 1.1 Mn steel containing boron, effects of the 0.1 V addition and processing condition were studied. In the $550^{\circ}C$ interrupted cooling where the main structure is (ferrite + pearlite), the impact toughness decreased as the tensile strength increased by the 0.1 V addition. The $800^{\circ}C$ rolling including two step rolling of $800-770^{\circ}C$, exhibited better strength-toughness balance, as compared to the $770^{\circ}C$ rolling. This seems to be kind of conditioning effect at higher temperature, e.g., more uniform deformation effect. In the accelerated cooling after the $750^{\circ}C$ rolling in a dual phase range, the impact toughness was enhanced, despite a large increase in tensile strength. This is believed to be related to the change of main structure from (ferrite + pearlite) to (ferrite + bainite).

• 대한한방부인과학회지
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• 제31권2호
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• pp.113-122
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• 2018

Purpose: To report the effect of Korean medical treatments on 1 patient with secondary amenorrhea after ovarian surgery for bilateral endometriomas diagnosed as premature ovarian failure. Methods: The patient who had secondary amenorrhea was treated with Korean medical treatments such as herbal medication, herbal acupuncture and moxibustion therapy, and so forth. Results: After the Korean medical treatments, the patient could have her periods again. And high FSH level was decreased to normal. Conclusions: The case report shows that Korean medical treatment can be an effective option for treating secondary amenorrhea after ovarian surgery for bilateral endometriomas diagnosed as premature ovarian failure.