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김문성,배형 한국부동산연구원 2015 부동산연구 Vol.25 No.3
This study examined the characteristics of the cycle variation of the national housing price index since 1986 and analyzed the effects of macroeconomic variables on housing price index cycle variation for the period after 1990. Firstly, analyzed trend and cycle variation of housing price index, housing purchase price index was in the expansion phase of sixth cycle, housing jeonse price index was in the contraction phase of fifth cycle. However, reference point March 2005, these price indices showed that contraction phase was longer than the period of the expansion phase. Accordingly this result, this study separated periods by March 2005 and examined the effect of macroeconomic variables with respect to housing price index cycle variation by Bayesian VAR Model. The impulse response analysis showed that these price indices showed a generally negative reaction to the interest rate in two periods. However, impulse response function of these housing price indices were shown a change in reaction degree and direction to the other macroeconomic variables. In addition, as a result of variance decomposition, the effect of macroeconomic variables to housing purchase price index was significantly reduced. But the effect of macroeconomic variables to housing jeonse price index was increased and showed the changes in the variables that affect. Considering these results, it may take a different policy approaches with respect to the housing market. 본 연구는 1986년 이후 전국 주택가격지수의 순환변동의 특성을 살펴보고 1990년 이후 기간에 대하여 주택가격 순환주기변동에 대한 거시경제변수의 영향에 대하여 분석하였다. 우선 주택가격지수의 추세 및 순환변동 분석결과를 살펴보면, 주택매매 및 전세가격은 각 2번의 추세하락을 나타냈으며, 주택매매가격은 6번째 순환기의 확장기에, 주택전세가격은 5번째 순환기의 수축기에 있음을 확인할 수 있었다. 그러나 이들 가격지수는 2005년 3월을 기점으로 수축기의 기간이 확장기의 기간보다 길게 나타나는 순환주기의 변동을 나타내었다. 이에 따라 2005년 3월을 기준으로 기간을 구분하고 기간별 거시경제변수의 영향을 Bayesian VAR모형을 이용하여 살펴보았다. 먼저, 충격반응함수 분석에서는 전⋅후반기에 걸쳐 두 가격지수 모두 이자율에 대하여 대체로 음의 반응을 나타내었으나, 이외의 변수에 대하여는 반응정도 및 방향에서 변화를 나타내었다. 한편, 분산분해 결과에서는 주택매매가격 순환변동에 대하여 거시경제변수의 영향력은 크게 감소한 반면, 주택전세가격 순환변동에 대하여는 거시경제변수의 영향력은 커지며, 이에 영향을 주는 거시경제변수의 항목도 다르게 나타났다. 이러한 결과를 본다면, 주택시장에 대한 정책적 접근 시 주택시장 유형에 따라 다른 접근이 필요할 것으로 보인다.
김문성,박현철,이우찬 (사)디지털산업정보학회 2019 디지털산업정보학회논문지 Vol.15 No.3
Software education is inevitable for the success of the Fourth Industrial Revolution, and university education also requires innovation to cope with revolutionary change of the society. The number of students seeking employment in the IT field is steadily increasing regardless of the major of the student. However, the existing software-related courses offered by universities or private educational institutions are limited. This paper analyzes the existing software curriculum of several major universities for non-IT major students. In addition, in-depth surveys by students at Seoul Theological University is conducted to figure out the demand for the advanced level computer science subjects. Finally, new software education curriculum is proposed to fulfill the needs of non-IT major students and to improve the employment rate of non-IT major students seeking tech companies. The new curriculum will help to cultivate intermediate level IT experts that bridge the gap between advanced level IT experts and primitive level computer technicians.
김문성,강은주,배우용,김종국,김철훈,최재형,김상현,김대연,이기남 대한영상의학회 2019 대한영상의학회지 Vol.80 No.6
Purpose To investigate the relationship between carotid arterial calcium score (CarACS) and silent cerebrovascular lesions in patients with obstructive sleep apnea (OSA). Materials and Methods This study involved retrospective evaluation of 60 OSA patients who underwent both upper airway CT and brain MRI. Using polysomnography, several indicators, including apnea index (AI), were used to evaluate the relationship between OSA and silent cerebrovascular lesions. The CarACS was quantified on CT imaging using the modified Agatston method. Silent cerebrovascular lesions were evaluated on brain MRI by grading periventricular hyperintensity (PVH). Various clinical characteristics, including age, were analyzed in each patient. Results The number of patients per PVH grade 0, 1, 2, 3, and 4 was 26 (43.3%), 14 (23.3%), 14 (23.3%), 4 (6.7%), and 2 (3.3%), respectively. The mean age, hypertension, smoking status, AI, and CarACS were significantly different among PVH groups (Ps < 0.05). In univariate analysis, the presence of carotid arterial calcification (β = 0.483, p < 0.01), CarACS (β = 0.482, p < 0.01), and age (β = 0.360, p < 0.01) showed a significant association with PVH grade. The mean AI and lowest O2 saturation had statistically weak associations with PVH grade (β = 0.267, p < 0.01; β = -0.219, p < 0.14, respectively). In multivariate analysis, CarACS was the only factor affecting PVH grade (p < 0.04). Conclusion CarACS is associated with the severity of silent cerebrovascular lesions. Therefore, additional analysis of CarACS in OSA patients may provide more information on their cerebrovascular status.