• 천문학회보
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• 제31권2호
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• pp.53.1-53.1
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• 2006

• 천문학회보
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• 제33권2호
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• pp.35.2-35.2
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• 2008

• 기술사
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• 제37권2호
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• pp.58-61
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• 2004

황사는 중국과 몽골의 건조지역으로부터 바람에 의해 수송되어 날아오는 먼지 현상이다. 이 먼지현상은 이따금 멀리 북미대륙까지(Husar 등, 2001) 이동한 것이 위성영상으로 확인되며, 캐나다(McKendry 등, 2001)에서도 실제 관측되기도 한다. 요즘에는 이 먼지가 인체와 기후에 미치는 염려를 하는 사람이 많아지며, 이를 예측하는 연구가 시도되기도 한다. 우리나라에서 과거에 기록된 황사현상은 있을까？ 있다면, 얼마나 되며, 최근과 비교하면 무엇이 다른가？ 삼국시대의 역사 기록인 삼국사기와 고려시대의 고려사, 조선시대의 조선왕조실록과 증보문헌비고 속에 기록된 지난 약 2천년간의 기록을 정리해보았다. 또한 기존의 와다유우지(Wada, 1917)와 다무라센노스케(Tamura, 1983)의 조사결과도 참고하여, 우리나라에서의 관측된 황사기록을 가능한 많이 찾고, 확인하여, 과거 우리나라의 황사현상을 되짚어 보았다.

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2008년도 Asian Magnetics Conference
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• pp.261.2-261.2
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• 2008

• Journal of Chest Surgery
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• 제31권3호
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• pp.286-290
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• 1998

누두흉은 하부흉골과 인접늑연골이 함몰되는 선천성 기형으로 흉벽기형중 가장 흔한 질환이다. 대부분 미용적인 이유로 수술이 시행되어지며 수술시기는 신체적 및 정신적인 면을 고려할 때 학동기 이전에 하는것이 바람직한 것으로 되어있다. 최근 Ravitch술식에 의한 흉골거상법과 Wada술식에 의한 흉골반전법이 누두흉의 치료에 좋은 성적을 보이고 있다. 이에 본 교실에서는 누두흉의 외과적 치험례를 후향적으로 조사하여 적절한 수술치료 방향에 도움을 얻고자 본 연구를 시도하게 되었다. 본 연구에서는 1981년 1월부터 1996년 7월까지 누두흉의 외과적치료를 받은 24례의 환자들을 대상으로 성별및 연령별 분포, 주소, 동반질환유무, 변형의 정도, 심전도소견, 술후 합병증, 술후 환자 및 보호자의 만족도등을 분석하였다. 변형의 교정치는 일부에서 웰치지수(welch index)를 이용하여 술전 및 술후 변화를 관찰하였고, 만족도는 Humphreys 평가기준에 따라 분류하였다. 술후 합병증은 창상감염 2례, 기흉 2례, 재발 1례있었으며, 창상감염은 정기적인 dressing으로 치료되었고, 기흉은 폐쇄식 흉관삽관술을 시행하여 치료되었다. 재발 1례는 Ravitch술식후 발생하였으며 이는 다시 변형 Wada술식으로 교정하였다. 웰치지수(welch index)는 술전 평균 5.86이었으며 술후 4.10으로 의미있게 감소하였다(P<0.05). 환자의 만족도는 Humphreys 평가기준상 excellent 17례, good 4례로 만족스런 결과를 얻었다.

• Mass Spectrometry Letters
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• 제7권3호
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• pp.55-63
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• 2016

Growth hormone (GH)-releasing peptides (GHRPs) and GH secretagogues (GHSs) are listed in the World Anti-Doping Agency (WADA) Prohibited List. In the present study, we developed and validated a method for the simultaneous analysis of seven GHRPs (alexamorelin, GHRP-1, -2, -4, -5, -6, and hexarelin) and three GHSs (anamorelin, ibutamoren, and ipamorelin) in human urine. Method validation was performed at minimum required performance levels specified by WADA technical documents (2 ng/mL) for all substances, and the method was validated with regard to selectivity (no interference), linearity (R2 > 0.9986), matrix effects (50.0%-141.2%), recovery (10.4%-100.8%), and intra- (2.8%-16.5%) and inter-day (7.0%-22.6%) precisions. The limits of detection for screening and confirmation were 0.05-0.5 ng/mL and 0.05-1 ng/mL, respectively.

• Annals of Clinical Neurophysiology
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• 제8권2호
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• pp.163-170
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• 2006

Backgrounds: MEG can measure the task-specific neurophysiologic activity with good spatial and time resolution. Language lateralization using noninvasive method has been a subject of interest in resective brain surgery. We purposed to develop a paradigm for language lateralization using MEG and validate its feasibility. Methods: Magnetic fields were obtained in 12 neurosurgical candidates and one volunteer for language tasks, with a 306 channel whole head MEG. Language tasks were word listening, reading and picture naming. We tested two word listening paradigms: semantic decision of meaning of abstract nouns, and recognition of repeated words. The subjects were instructed to silently name or read, and respond with pushing button or not. We decided language dominance according to the number of acceptable equivalent current dipoles (ECD) modeled by sequential single dipole, and the mean magnetic field strength by root mean square value, in each hemisphere. We collected clinical data including Wada test. Results: Magnetic fields evoked by word listening were generally distributed in bilateral temporoparietal areas with variable hemispheric dominance. Language tasks using visual stimuli frequently evoked magnetic field in posterior midline area, which made laterality decision difficult. Response during task resulted in more artifacts and different results depending on responding hand. Laterality decision with mean magnetic field strength was more concordant with Wada than the method with ECD number of each hemisphere. Conclusions: Word listening task without hand response is the most feasible paradigm for language lateralization using MEG. Mean magnetic field strength in each hemisphere is a proper index for hemispheric dominance.

• 천문학논총
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• 제27권4호
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• pp.149-150
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• 2012

We have created new catalogues of AKARI/IRC $2-24{\mu}m$ North Ecliptic Pole Deep survey through new methods of image analysis. In the new catalogues the number of false detection decreased by a factor of 10 and the number of objects detected in multiple bands increased by more than 1,500 compared to the previous work. In this proceedings the new methods of image analysis and the performance of the new catalogues are described.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 Proceedings of the Korea Automatic Control Conference, 11th (KACC); Pohang, Korea; 24-26 Oct. 1996
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• pp.157-160
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• 1996

Physical systems axe generally continuous-time in nature. However as the data measured from these systems is generally in the form of discrete samples, and most modern signal processing is performed in the discrete-time domain, discrete-time models are employed. This paper describes methods for estimating the coefficients of continuous-time system within a closed loop control system. The method employs a recursive estimation algorithm to identify the coefficients of a discrete-time bilinear-operator model. The coefficients of the discrete-time bilinear-operator model closely approximate those of the corresponding continuous-time Laplace transform transfer function.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -1
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• pp.98-101
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• 2002

This paper reports a parallel architecture in a HMM based speech recognition system for a low-power LSI design. The proposed architecture calculates output probability of continuous HMM (CHMM) by using concurrent and pipeline processing. They enable to reduce memory access and have high computing efficiency. The novel point is the efficient use of register arrays that reduce memory access considerably compared with any conventional method. The implemented system can achieve a real time response with lower clock in a middle size vocabulary recognition task (100-1000 words) by using this technique.