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최형인,백선영,김수영 한국식물생명공학회 2017 Plant biotechnology reports Vol.11 No.4
Class-I patatin genes, which encode the potato storage protein patatin, are tuber specific in their expression, and several promoter elements directing the tissuespecific expression of the patatin genes have been known for long time. However, the identity of the relevant transcription factors is still unknown. In this study, we show that K box, one of the protein-binding sites in a class-I patatin gene promoter, is a novel cis-regulatory element required for the tuber-specific expression of the gene. Subsequently, we isolated K-box-binding factors by yeast one-hybrid screening. Analysis of the factors revealed that they are MYB class transcription factors, which we named TSF1–4 (tuber-specific and sucrose-inducible elementbinding factors 1–4). TSFs possess transcriptional activity to various degrees, and overexpression of TSF2, which possesses the highest transcriptional activity, induced the ectopic expression of patatin genes in potato leaves. Our results strongly suggest that TSFs could play regulatory function in the expression of patatin genes in planta.
최형인,변정우 (사)한국관광레저학회 2012 관광레저연구 Vol.24 No.6
The purpose of this study is to address the relationship among usability, satisfaction, trust and passenger's loyalty in airline industry. Usability concept was adopted to measure how airline passengers are evaluating websites, call centers, kiosks, and mobile application when they achieve their transactional objectives. Also, usability as a strong antecedent, it will affect the passenger's satisfaction and trust and eventually loyalty. Using self-report questionnaire, survey was conducted at the Incheon International Airport and Kimpo International Airport with random sampling method. Total 427 valid responses were analyzed with Confirmatory Factor Analysis(CFA) and Structural Equation Modeling(SEM) to verify the hypotheses. The result reveals that usability is positively related to passenger's satisfaction and trust, and satisfaction and trust significantly effect on loyalty. Consequently, managerial implications of managing airline companies' multichannels are proposed.
Valuation and hedging of options with general payoff undertransactions costs
최형인,David Heath,구혜진 대한수학회 2004 대한수학회지 Vol.41 No.3
We present the pricing and hedging method for options with general payoffs in the presence of transaction costs. The convexity of the payoff function - gamma of the options - is an important issue under transaction costs. When the payoff function is convex, Leland-style pricing and hedging method still works. However, if the payoff function is of general form, additional assumptions on the size of transaction costs or of the hedging interval are needed. We do not assume that the payoff is convex as in Leland [11] and the value of the Leland number is less (bigger) than 1 as in Hoggard et al. [10], Avellaneda and Par´as [1]. We focus on generally recognized asymmetry between the option sellers and buyers. We decompose an option with general payoff into difference of two options each of which has a convex payoff. This method is consistent with a scheme of separating out the seller’s and buyer’s position of an option. In this paper, we first present a simple linear valuation method of general payoff options, and also propose in the last section more efficient hedging scheme which costs less to hedge options.
3D프린터 필라멘트 색상과 베드 출력위치에 따른 ABS 인장시편 무게 차이에 관한 연구
최형인,김택근 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.6
Recently 3d printer industry has two demands. first is color 3d printing. second is mass production using 3d printer that has large bed. According to previous studies, 3D printed objects have different weights depending on filament colors. 3D printed tensile specimens with filaments of various colors were checked to see they had the same weight. If so, we wanted to see it was statistically significant. As a result, we found that the weight of 3D printed objects was statistically significantly different depending on the filament color. The average weight of 3d printed objects is: Black(8.63g), Blue(8.58g), Yellow(8.53g), White(8.48g), Natural(8.46g), Green (8.45g), Red(8.42g).
머신러닝을 활용한 SLA 3D프린터 베드 탈조 방지용 샌드블라스팅 표면처리 품질검사를 위한 필터 개발에 관한 연구
최형인 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.5
The SLA 3d printer is the first of the commercial 3D printer. The 3D printed output is printed hanging on the bed that move to the upper position. Sandblasted bed is used to prevent layer shift. If sandblasting is wrong, the 3D printed output is layer shifted. For this reason, 3D printer manufacturing companies inspect the bed surface. However, the sandblasted surface has variety of irregular shapes and craters, so it is difficult to establish a quality control standard. To solve problems, this paper presents a standardized sandblasting histogram and threshold. We present a filter that can increase the classification rate.
최형인,한상규 한국기계기술학회 2023 한국기계기술학회지 Vol.25 No.5
The automotive industry continuously strives to enhance safety for both drivers and passengers through technological advancements. Car side impacts have the potential to significant risks to passengers, So the automotive industry has proposed various technological solutions. As part of these efforts, the development of side impact beams, which are affixed to the inner frame of vehicle side doors to absorb and dissipate collision energy, has been a safety enhancement. Conventional side impact beams are manufactured using hot-rolled steel sheets and have a pipe-like configuration. However, these impact beams are fixed to the vehicle's chassis, which directly transfers the energy generated during a collision to the chassis frame. This paper aims to address this issue by proposing the development and optimization of vehicle door impact beams using a dual-beam structure and fastening method, utilizing shear bolts. Moreover, the focus is on optimizing the cross-sectional shape of the dual-beam impact structure. The evaluation criterion for optimization is based on the second moment of area of the cross-section. To validate these improvements, Static experiments were conducted, comparing the proposed dual-beam structure with the traditional impact beam. This research is expected to serve as a guideline for enhancing vehicle safety through design directions and validation methods.