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박형래,이충국,김진,박소연,박형래 大韓顎顔面成形再建外科學會 1990 Maxillofacial Plastic Reconstructive Surgery Vol.12 No.2
Intraosseous carcinoma of the jaw may arise as metastatic lesions most commonly from breast, lung, kindney and thyroid and also primarily occur from ameloblastoma or odontogenic cyst. Rarely primary intraosseous carcinoma could be originated from the epithelium involved in odonotogenesis. According to WHO's classification, primary intraosseous carcinoma is defined as squamous cell carcinoma, occured in the Jaw without connection to the oral mucosa. However, Elzay defined primary intraosseous carcinoma as malignant epithelial tumor related to the odontogeni apparatus, including carcinoma exodontogenic cyst, carcinoma ex-ameloblastoma and carcinoma de novo. We experienced 2 cases of intraosseous carcinoma of the jaw. The first case, a 59-year-old man, showed a ill-defined mass on the left maxilla, measuring 8x10cm in size. He received radical hemimaxillectomy and was diagnosed as ameloblastic carcinoma. The second case obtained from a 79-year-old woman showed a ill-defined 6x8cm sized mass on the left mandibular body area. The mass was surgically removed by partial mandibulaectomy, which was diagnosed as the primary intraosseous carcinoma, probably odonotogenic origin.
국제무역에서 수입생산요소와 국내요소간의 대체관계에 관한 실증적 연구 - 국내 철강산업을 대상으로 -
박형래 한국무역통상학회 2015 무역통상학회지 Vol.15 No.2
This paper presents results of a Zellner's SURE-regression analysis on empirical estimates of imported and domestic energy substitution in Korea Steel Industy. Theoretically it is clear that a distinction should be made between Morishima substitution elasticities and cross-price elasticities. The former represent purely technical substitution possibilities while the latter include an income effect and therefore represent economic substitution potential. I estimate a Zellner's SURE-regression model with separate coefficients for the Korean Steel industry. My findings suggest that primary model assumptions on returns to scale, technological change and separability of input factors matter for the outcome of a primary study. Aggregation of variables and the type of data used in empirical research are also relevant sources of systematic effect-size variation. Taking these factors into consideration, I compute ideal-typical elasticities for the energy demand. The resulting figures clearly show that substitution elasticities are substantially higher than cross price elasticities. Therefore, despite considerable technical opportunities for imported and domestic energy substitution, the cross price elasticities are not statistically different from zero.
A Memory-Efficient Fingerprint Verification Algorithm Using a Multi-Resolution Accumulator Array
박형래,곽영길,Hong Wang 한국전자통신연구원 2003 ETRI Journal Vol.25 No.3
Using biometrics to verify a person’s identity has several advantages over the present practices of personal identification numbers (PINs) and passwords. At the same time, improvements in VLSI technology have recently led to the introduction of smart cards with 32-bit RISC processors. To gain maximum security in verification systems using biometrics, verification as well as storage of the biometric pattern must be done in the smart card. However, because of the limited resources (processing power and memory space) of the smart card, integrating biometrics into it is still an open challenge. In this paper, we propose a fingerprint verification algorithm using a multi-resolution accumulator array that can be executed in restricted environments such as the smart card. We first evaluate both the number of instructions executed and the memory requirement for each step of a typical fingerprint verification algorithm. We then develop a memory-efficient algorithm for the most memory-consuming step (alignment) using a multiresolution accumulator array. Our experimental results show that the proposed algorithm can reduce the required memory space by a factor of 40 and can be executed in real time in resource-constrained environments without significantly degrading accuracy.
An Efficient Adaptive Polarimetric Processor with an Embedded CFAR
박형래,곽영길,Hong Wang 한국전자통신연구원 2003 ETRI Journal Vol.25 No.3
To improve the detection performance of surveillance radars with polarization diversity, we developed an adaptive polarimetric processor and compared it with other polarimetric processors. We derived our adaptive polarimetric processor, called the polarization discontinuity detector (PDD), from the generalized likelihood ratio (GLR) test principle for the unspecified target component. We derived closed-form expressions of its probabilities of detection and false alarm, and compared its performance to that of the adaptive polarization canceller (APC) and Kelly’s GLR processor. The PDD had a performance similar to Kelly’s GLR in Gaussian clutter, and both the PDD and Kelly’s GLR, which have embedded constant false alarm rates (CFARs), outperformed the APC, especially when the target polarization state was close to the clutter’s polarization state. The important difference is that the PDD is much simpler than Kelly’s GLR for hardware/software implementation, because the PDD does not require a costly two-parameter filter bank to cover the unknown target polarization state as Kelly’s GLR does.
박형래,정병욱,장유식 한국무역학회 2011 Journal of Korea trade Vol.15 No.1
This paper investigates the determinants of the risk premium of international syndicated corporate loans utilizing extensive syndicate deal database, DealScan, and provides a unique empirical analysis over the test duration from January 2000 to December 2008, including the period of the global financial crisis in 2007-2008. This paper not only examines the macroeconomic and microeconomic determinants of loan risk premiums, but also inspects how exchange rate volatility and the global financial crisis affected the loan risk premium in international lending. The findings of this paper are summarized as following: (i) foreign exchange risk increased loan risk premium of international syndicated corporate loans, (ii) the global financial crisis increased loan risk premiums, (iii) country and macroeconomic factors had appropriate effects on loan risk premiums based on their characteristics, and (iv) borrowing firm and contract factors such as loan size, loan maturity, loan purposes, and borrower’s business sector also had appropriate effects on the risk premium based on their characteristics.
박형래,초서량,김구태 한국무역통상학회 2013 무역통상학회지 Vol.13 No.1
This paper seeks to search Korea’s strategic alternatives for the Korea-China-Japan FTA and Regional Comprehensive Economic Partnership (RCEP) negotiations after examining the changes and progress of the Korea, China and Japan and economic status and relationship of trade interdependence. From the viewpoint of three nations, Korea, China and Japan that need to pursue after Korea-China-Japan FTA and RCEP almost around the same time. First, it is recommended to pursue after the Korea-China-Japan FTA first and foremost, playing a leading role in case of the RCEP negotiations. Second, however, there is a need to prepare for the situation in which the three nation FTA is pursued at the RCEP level to prepare for the instance in which Korea-China-Japan FTA may be delayed. If the negotiation between Japan and China should be delayed compared to the agreements reached between Korea and China, and Korea and Japan, Korea has to sign the two-party FTA first, naturally. However, the Korean government needs to take on a more active role when it comes to the Korea-China-Japan FTA since Korea-China-Japan FTA is needed for the RCEP and since Korea-China-Japan FTA can contribute to the improvement of overall relationship at the regional level.