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資源問題 硏究 Ⅱ : 資源危機論에 對한 分析·評價 the kernel of natural resource crisis
朴喆煥 강릉대학교 영동산업문제연구소 1983 産經論叢 Vol.1 No.-
Not only an old but new concept is the Natural Resource Crisis that has been told since World War Ⅱ. After that there were great disputes arising between the two sides of Haves and Have-nots with Natural Resources as the central figure. 'Limits to the Growth' by Rome club instigated the world to watch it with their heart in their mouths.. Here I am to devide the crisis into three classes that have been studied in 1970s. 1. a long-term and physical crisis that contains the limits to ecological on the earth 2. a contemporary and transitional crisis that contains the oil problem 3. an artificial crisis that contains the international economic order and resource nationalism I am eager to suggest the best way to overcome the crisis by approaching a tip-up in international political and economic order.
Intuitionistic Fuzzy Strong Hyper K-Subalgebras in Hyper K-algebras
박철환 한국지능시스템학회 2008 한국지능시스템학회논문지 Vol.18 No.4
Intuitonistic fuzzifications of (strong) hyper K-subalgebras in hyper K-algebras are discussed, and related properties are investigated. Relations between intuitionistic fuzzy hyper K-subalgebras and intuitionistic fuzzy strong hyper K-subalgebras are provided.
박철환,전영배 한국수학교육학회 2008 純粹 및 應用數學 Vol.15 No.3
The notion of central Hilbert algebras and central deductive systems is introduced, and related properties are investigated. We show that the central part of a Hilbert algebra is a deductive system. Conditions for a subset of a Hilbert algebra to be a deductive system are given. Conditions for a subalgebra of a Hilbert algebra to be a deductive system are provided.
Intuitionistic fuzzy interior ideals in ordered semigroup
박철환 한국지능시스템학회 2007 한국지능시스템학회논문지 Vol.17 No.1
In this paper, we consider the intuitionistic fuzzication of the notion of a interior ideal in ordered semigroupS, andinvestigate some properties of such ideals. In terms of intuitionistic fuzzy set, characterizations of intuitionistic fuzzyinterior ideals in ordered semigroups are discussed. Using a collection of interior ideals with additional conditions, anintuitionistic fuzzy interiror ideal is constructed. Natural equivalence relations on the set of all intuitionistic fuzzy interiorideals of an ordered semigroup are investigated. We also give a characterization of a intuitionistic fuzzy simple semigroupin terms of intuitionistic fuzzy interior ideals.
박철환,이상민,홍유진,김태훈 대한영상의학회 2015 대한영상의학회지 Vol.72 No.2
Purpose: We assessed the effect of a low-dose β-blocker on heart rate (HR), HR variability (HRV) and image quality of prospective electrocardiography-gated coronary CT angiography (CCTA) in healthy subjects with low HR. Materials and Methods: CCTA was performed with a 64-slice CT in 75 subjects with a HR of less than 65 beats per minute (bpm). Subjects were divided into 2 groups: Group 1 (G1), 35 with a low dose β-blocker; and Group 2 (G2), 40 without pre-medication. The image quality (IQ) of the CCTA was assessed on a 4-point grading scale (1, poor; 4, excellent). Results: Initial HR (bpm) was not different between the 2 groups. HR during CCTA was lower in G1 than G2 (50.3 ± 5.6 vs. 53.3 ± 4.8, p = 0.016). HRV was not different between the 2 groups. Per-segment analysis showed better IQ at the mid-segment of the right coronary artery (3.0 ± 0.9 vs. 2.5 ± 1.1, p = 0.039) and the first diagonal branch (3.4 ± 0.6 vs. 3.1 ± 0.7, p = 0.024), in the G1 than the G2 group, respectively. The IQ was negatively correlated with HR, but no correlation was found between HRV and IQ. The IQs in the per-vessel analysis were not different between the 2 groups. Conclusion: Low-dose β-blocker reduced HR and improved the IQ of CCTA in a few segments, even at a HR of less than 65 bpm. However the effect was limited.
박철환,최의영,Andreas Greiser,Mun Young Paek,황성호,김태훈 대한영상의학회 2013 Korean Journal of Radiology Vol.14 No.5
The diagnosis of myocarditis can be challenging given that symptoms, clinical exam findings, electrocardiogram results, biomarkers, and echocardiogram results are often non-specific. Endocardial biopsy is an established method for diagnosing myocarditis, but carries the risk of complications and false negative results. Cardiac magnetic resonance imaging (MRI) has become the primary non-invasive imaging tool in patients with suspected myocarditis. Myocarditis can be diagnosed by using three tissue markers including edema, hyperemia/capillary leak, and necrosis/fibrosis. The interpretation of cardiac MR findings can be confusing, especially when the myocardium is diffusely involved. Using T1 and T2 maps, the diagnosis of myocarditis can be made even in cases of global myocarditis with the help of quantitative analysis. We herein describe a case of acute global myocarditis which was diagnosed by using quantitative T1 and T2 mapping.