• Coupled systems mechanics
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• 제2권4호
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• pp.329-348
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• 2013

This study aims at observing the coupling behaviours between suspended ceilings and partition walls in terms of their global seismic performance using full-scale shake table tests. The suspended ceilings with planar dimensions of $6.0m{\times}3.6m$ were tested with two types of panels: acoustic lay-in and metal clip-on panels. They were further categorized as seismic-braced, seismic-unbraced, and non-seismic installations. Also, two configurations of 2.7 m high partition wall specimens, with C-shape and I-shape in the plane layouts, were tested. In total, seven ceiling-partition-coupling (CPC) specimens were tested utilizing a unidirectional seismic simulator. The test results indicate that the damage patterns of the tested CPC systems included failure of the ceiling grids, shearing-off of the wall top railing, and, most destructively, numerous partial detachments and falling of the ceiling panels. The loss of panels was mostly concentrated near the center of the tested partition wall. The testing results also confirmed that the failure mode of the non-seismic CPC systems was brittle: The whole system would collapse suddenly all at once when the magnitude of the inputs hit the capacity threshold, rather than displaying progressive damage. Overall, the seismic capacity of the unbraced and braced CPC systems could be up to 1.23 g and 2.67 g, respectively; these accelerations were both achieved at the base of the partition wall. Nonetheless, for practical applications, it is noteworthy that the three-dimensional nature of seismic excitations and the size effect of the ceiling area are parameters that exacerbate the CPC's seismic response so that their actual capacity may be dramatically decreased, leading to important losses even in moderate seismic events.

• 대한수의학회지
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• 제49권4호
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• pp.351-354
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• 2009

Diaphragmatic hernias, whether congenital or acquired (traumatic), are rarely observed in the horse. Acquired diaphragmatic hernias typically occur secondary to trauma or an increase in intraabdominal pressure due to falling, heavy exercise, or parturition. Diaphragmatic herniorrhaphy is difficult to perform in adult horses and the horses with symptomatic diaphragmatic hernias usually die. A 10- year old, 340 kg, Jeju horse (crossbred) broodmare with sudden onset of gait disorder and a moderate emaciation was examined. Findings on physical examination included conjunctivitis, dehydration, shallow breathing, dyspnea, weaken heart beat, lack of auscultatable sounds from the gastrointestinal tract, and anorexia. Rectal temperature was $38.4^{\circ}C$ and respiratory rates were moderately increased. There were slight signs of acute colic. The broodmare died one day after non-specific treatment of fluids, nutriment, antibiotics and non-steroidal anti-inflammatory drug. The cause of death was strangulation of the small intestine through a diaphragmatic hernia. The rent was about 2 cm in diameter and located in the central right part of diaphragm. Around 60 cm of small intestine was protruded into thoracic cavity through the rent. The cause of the hernia could not be ascertained. The broodmare had been pastured with many other horses, and the groom had not noticed any aggressive behavior among them. It was, however, speculated that trauma by stallion's attack may have been the cause of the diaphragmatic hernia, because the new horse may be the object of behaviors ranging from mild threats to seriously aggressive kicking, squealing, rearing, and biting.

• 디지털융복합연구
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• 제11권6호
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• pp.169-174
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• 2013

음성 인식 성능 저하의 문제는 모델 훈련 환경과 인식 환경의 차이이다. 이러한 환경의 불일치를 줄이기 위한 방법으로 다양한 묵음 특징 정규화 방법을 사용하고 있다. 기존의 묵음 특징 정규화 방법은 낮은 신호 대 잡음비에서 묵음 구간의 에너지 레벨이 증가하여 음성과 비음성에 대한 분류의 정확도가 떨어짐으로 인해 인식 성능이 저하되는 문제점이 있다. 본 논문에서는 음성 에너지 최대화와 묵음 특징 정규화를 이용한 잡음 환경에 강인한 음성 검출 방법을 제안하였다. 제안한 방법은 높은 신호 대 잡음비에서는 음성 에너지를 최대화시켜 특징이 잡음의 영향을 적게 받는 특성을 이용하였고 낮은 신호 대 잡음비에서는 음성/비음성의 켑스트럼 특징 분포 특성을 이용하여 인식 성능을 향상시켰다. 인식 실험 결과 기존 방법에 비해 향상된 인식 성능을 확인할 수 있었다.

• 대한장애인치과학회지
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• 제6권1호
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• pp.19-22
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• 2010

1. 뇌성마비 환자는 질환의 특성상 전치부 개교를 동반한2급 부정교합. 이갈이 및 강한 폐구습관, 반복적인 간질 발작을 가지는 경우가 많다. 2. 이와 같은 특성은 전치부 외상 및 재외상 빈도를 높일뿐 아니라 전치부 수복물의 예후를 불량하게 한다. 3. 뇌성마비 환자의 전치부 수복시 일반적인 보철치료 외에도 인공치나 자연치를 포함한 Nance holding arch를 고려할 수 있으며 환자의 병력과 습관, 교합관계를 정확히 파악하여 적절한 수복물을 선택하여야 한다.

• 한국사회복지학
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• 제65권1호
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• pp.201-226
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• 2013

외환위기 이후 청년실업의 증가가 사회적 문제로 부각되었으나, 청년층의 노동시장 경험에 관한 연구는 제한적으로 이루어져 왔다. 본 연구에서는 노동경력을 단순한 일자리 이동과 달리 노동지위의 연속적 배열과 순서적이고 위계적인 변화과정으로 개념화하였으며, 배열분석을 활용하여 외환위기 전후 청년층의 노동경력을 노동지위의 다양한 측면에서 비교하였다. 분석 결과, 외환위기 이후 첫 일자리로의 이행기간이 장기화되고 고용형태와 사업장 규모 면에서 첫 일자리의 질적 저하가 발생하였음이 확인되었다. 또한 외환위기 이후 청년 코호트는 미취업형과 실업형, 비대기업형, 비정규직형 및 이동형 특성을 갖는 경력유형에 속할 상대적 위험률이 높았다. 이러한 결과는 전반적으로 외환위기 이후 청년층의 고용불안정성이 더 커졌으며, 내부노동시장형에 비해 외부노동시장형 경력유형이 상대적으로 증가한 것을 의미한다.

• 한국조경학회지
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• 제34권5호
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• pp.84-99
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• 2006

The traditional temples located in national parks have various functions, such as religious practice, tourist destination, and conservation for cultural and natural resources. One functions have implicit monetary values in terms of public benefits. The purpose of this study was to estimate both use and non-use conservation values for two traditional temples, Sinheungsa and Haeinsa, using the contingent valuation method. In the study, both single-bounded and double-bounded dichotomous choice methods were used in an application of Turnbull distribution-free model. A total of 659 visitors were interviewed, 350 in Sinheungsa and 309 in Haeinsa. The mean WTP (willingness to pay) for Sinheungsa using single-bounded method was 4,040 Won for the use value, 6,157 Won for the cultural conservation value, and 5,624 Won for the natural conservation value. The mean WTP for Haeinsa using single-bounded method was 6,463 Won for the use value, 8,769 Won for the cultural conservation value, and 8,013 Won for the natural conservation value. The total economic value of each temple accounted for 50% (Sinheungsa) and 80% (Haeinsa) of the total economic value of the associated national park. It was also found that the single-bounded method was more conservative than the double-bounded method in terms of value estimation. The WTP was highest for the cultural conservation value and lowest for the use values in both temples, with natural conservation values falling in the middle, which showed that people perceived traditional temples as the cultural heritage. Based on these results, it was suggested that traditional temples should be designated as an 'multiple heritage area' so that conservation can be used as the main criteria for various use programs.

• 한국전문물리치료학회지
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• 제28권3호
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• pp.161-167
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• 2021

Understanding sciences behind fall-related hip fractures in older adults is important to develop effective interventions for prevention. The aim of this review is to provide biomechanical understanding and prevention strategies of falls and related hip fractures in older adults, in order to guide future research directions from biomechanical perspectives. While most hip fractures are due to a fall, a few of falls are injurious causing hip fractures, and most falls are non-injurious. Fall mechanics are important in determining injurious versus non-injurious falls. Many different biomechanical factors contribute to the risk of hip fracture, and effects of each individual factors are known well. However, combining effects, and correlation and causation among the factors are poorly understood. While fall prevention interventions include exercise, vision correction, vitamin D intake and environment modification, injury prevention strategies include use of hip protectors, compliant flooring and safe landing strategies, vitamin D intake and exercise. While fall risk assessments have well been established, limited efforts have been made for injury risk assessments. Better understanding is necessary on the correlation and causation among factors affecting the risk of falls and related hip fractures in older adults. Development of the hip fracture risk assessment technique is required to establish more efficient intervention models for fall-related hip fractures in older adults.

• Nuclear Engineering and Technology
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• 제54권6호
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• pp.2023-2030
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• 2022

A novel pulse fitting analysis (PFA) method is presented for the acquisition of nuclear spectra. The charging process of the feedback capacitor in the resistive feedback charge-sensitive preamplifier is equivalent to the impulsive pulse, and its impulse response function (IRF) can be obtained by non-linear fitting of the falling edge of the nuclear pulse. The integral of the IRF excluding the baseline represents the energy deposition of the particles in the detector. In addition, since the non-linear fitting process in PFA method is difficult to achieve in the conventional architecture of spectroscopy system, a new multi-channel analyzer (MCA) based on Zynq SoC is proposed, which transmits all the data of nuclear pulses from the programmable logic (PL) to the processing system (PS) by high-speed AXI-Stream in order to implement PFA method with precision. The linearity of new MCA has been tested. The spectrum of ¹³⁷Cs was obtained using LaBr₃(Ce) scintillator detector, and was compared with commercial MCA by ORTEC. The results of tests indicate that the MCA based on PFA method has the same performance as the commercial MCA based on pulse height analysis (PHA) method and excellent linearity for γ-rays with different energies, which infers that PFA method is an effective and promising method for the acquisition of spectra. Furthermore, it provides a new solution for nuclear pulse processing algorithms involving regression and iterative processes.

• Journal of Korea Trade
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• 제23권7호
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• pp.147-155
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• 2019

Purpose - As the U.S.-China trade war has become considerably worse, the Chinese government is considering applying non-tariff barriers to trade, especially local contents rule. The main purpose of this research is to check whether it is suitable for Korean investors to invest in the current Chinese capital market. Design/methodology - In order to check the stability of the recent Chinese capital market, we investigated the behavior of foreign equity investment (including Korean equity investment) in the Chinese capital market after China announced the Shanghai-Hong Kong Stock Connect (SH-HK Connect). In this paper, we researched whether international portfolio investment would or would not contribute to an increase the volatility of an emerging market's stock market (Chinese capital market) when foreign investors make investment decisions based on the objective of short-term gains by rushing into countries whose markets are booming and fleeing from countries whose markets are falling. Findings - The empirical results indicate that foreign investors show strong, negative feedback trading behavior with regard to the stock index of the Shanghai Stock Exchange (SSE), and when the performance of foreign investors in the Chinese stock market was fairly good. Also, we found evidence that the behavior of foreign investors significantly decreased volatility in SSE stock returns. Consequently, the SH-HK Connect brought on a win-win effect for both the Chinese capital market and foreign investors. Originality/value - It appeared that the Chinese capital market was very suitable for Korean investors after the China's declaration of the SH-HK Connect. However, the win-win effect was brought on by the Chinese government's aggressive capital control but the capital controls could possibly cause financial turmoil in the Chinese capital market. Therefore, Chinese reform in industrial structure and the financial sector should keep pace with suitable capital control policies.

• 대한토목학회논문집
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• 제28권2D호
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• pp.191-203
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• 2008

사업용 자동차 교통사고 특성 분석(도로교통안전관리공단, 2007)에 따르면, 사업용 차량의 1만대 당 교통사고 발생률과 사망률이 비사업용 차량에 비해 각각 6.7배와 5.3배 높은 것으로 나타났다. 또한 최근 10년 동안 전체 교통사고는 연평균 1.5% 감소한데 비하여, 사업용 차량의 교통사고는 연평균 2.0%씩 증가하는 추세를 보이고 있다. 최근 10년 동안 사업용 차량 중 버스와 화물트럭의 교통사고 발생건수는 꾸준히 감소하였다. 그러나 택시의 교통사고 발생건수만은 연평균 5.6%씩 꾸준히 증가하고 있다. 이와 같은 상황에서 심리성격 분석 기법인 Q분석을 통하여, 택시 운전자의 운전 성향별 특성을 파악하고, 운전 성향별 교통사고 저감대책을 마련하고자 하였다.