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귀금속 수출입의 한-EU FTA 영향분석 -주얼리, 손목시계 중심으로-
이정섭 ( Jung Seob Lee ),김용진 ( Yong Jin Kim ) 한국유통물류정책학회 2022 유통물류연구 Vol.9 No.2
2011년 발효된 한-EU FTA 이후 10년이 지났다. 본 논문은 한-EU FTA 이전 10년과 한-EU FTA 이후 10년간의 귀금속과 손목시계의 수출입 변화를 분석하고 국내 산업에 미치는 영향과 소비자 인식 변화를 연구하였다. 연구 대상인 3개 HS코드에 해당하는 귀금속과 손목시계 모두 수입 의존도가 높아졌고, 국내 제품의 국제 경쟁력은 떨어졌다. 한-EU FTA를 통해 EU의 국내 수입량이 더욱 증가했고, EU의 시장 점유율도 증가했다. 본 연구의 대상은 HS 코드 7113, 7117, 9101에 해당하는 귀금속 주얼리, 패션 주얼리, 손목시계로 한정하였다. 기존 논문들은 특정 제품군에 대한 연구보다는 FTA 발효 후 전반적인 경제적 파급효과를 연구한 반면, 이번 연구는 귀금속 관련 제품에 특화된 분석이라는 점에서 기존 연구와는 차이가 있다. 10 years have passed since the Korea-EU FTA, which came into effect in 2011. This study studied how the domestic industry and consumer perception were affected by the changes in the import and export of precious metals and wristwatches before and after 10 years of the agreement taking place. As a result, import dependency increased on all three targeted HS codes and the competitiveness of domestics on the other way fell. After the agreement kicked off, the import amount from the EU and their market share climbed over. The subjects of this study were limited to precious metal jewelry, fashion jewelry, and wristwatches according to HS code 7113, 7117, and 9101. Previous papers studied overall economic ripple effects after the FTA took effect instead of specific product groups, on this research, however, focused on the precious metal-related products. Whereas previous papers studied overall economic ripple effects after the FTA took effect rather than research on specific product groups, this research was different from previous studies in that it was limited to precious metal-related products.
이정섭(Jung-Seob Lee),권오민(Oh-Min Kwon),주효남(Hyo-Nam Joo),김준식(Joon-Sik Kim),류근호(Keun-Ho Rew) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.5
In this paper, new inspection method is proposed for the surfaces of lead frame and IC"s. Optimal optical system and the accurate algorithm for the surface inspection are needed in machine vision area. The proposed optical system is composed of rectangular oblique light illumination and coaxial light illumination for the higher contrast and the results shows the better performances through experiments. The markings of IC surface are inspected using the accurate proposed method using the partitioned correlation coefficient, and the result shows reduction of under kill ratio compared to the previous method.
외이 재생을 위한 세포 프린팅 기반 복합 조직 구조물의 개발
이정섭(Jung-Seob Lee),정진우(Jin Woo Jung),심진형(Jin-Hyung Shim),오정훈(Jeong-Hoon Oh),조동우(Dong-Woo Cho) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Tissue engineering is an interdisciplinary field to regenerate and reconstruct damaged tissues and organs. Especially, the cell printing enabling the regeneration of the target tissue has been considered to be a promising technology. However, the cell printing technology is known to be difficult to fabricate the 3D composite tissue with complex shape. In this study, we used 3D printing technology including multiple cells positioning technology and a sacrificial layer process to regenerate various tissues as well as an ear. The main part was printed with poly-caprolactone (PCL) and multiple cells-laden hydrogel. At the same time, poly-ethylene-glycol (PEG) was also deposited as a sacrificial layer to support the main part. After complete fabrication, PEG can be easily removed in aqueous solutions, and the procedure for removing PEG has no effect on the cell viability. Though 3D printing technology, the various composite tissues were fabricated with the desired shape and separately printed cells in the structure also had good cell viability. As a result, the possibility of fabricating the complex composite tissue using 3D printing technology which allowed tissue formation was confirmed.
QFN 반도체 패키지의 외형 결함 검사를 위한 효과적인 결함 분류 시스템 개발
김효준,이정섭,주효남,김준식,Kim, Hyo-Jun,Lee, Jung-Seob,Joo, Hyo-Nam,Kim, Joon-Seek 한국융합신호처리학회 2009 융합신호처리학회 논문지 (JISPS) Vol.10 No.2
There are many different types of surface defects on semiconductor Integrated Chips (IC's) caused by various factors during manufacturing process, such as cracks, foreign materials, chip-outs, chips, and voids. These defects must be detected and classified by an inspection system for productivity improvement and effective process control. Among defects, in particular, foreign materials and chips are the most difficult ones to classify accurately. A vision system composed of a carefully designed optical system and a processing algorithm is proposed to detect and classify the defects on QFN(Quad Flat No-leads) packages. The processing algorithm uses features derived from the defect's position and brightness value in the Maximum Likelihood classifier and the optical system is designed to effectively extract the features used in the classifier. In experiments we confirm that this method gives more effective result in classifying foreign materials and chips. 반도체 외관결함에는 발생 요인이 각각 다른 crack, foreign material, chip-out, chip, void 등이 있으며, 검사 시스템에서는 결함 유무 및 결함 분류를 수행하여 효과적인 공정관리가 가능하여야 한다. 본 논문에서는 QFN 패키지 결함의 분류를 위한 알고리즘 및 광학시스템을 제안한다. 제안한 방법에서 분류가 어려운 결함 중 하나인 foreign material 과 chip의 효과적인 분류를 위해 제안한 결함의 위치, 밝기의 특징정보(feature)를 사용한 ML(Maximum Likelihood ratio) 분류방법 및 특징정보 획득에 효과적인 광학계를 제안하였다. 실험 결과에서 분류가 어려운 foreign material과 chip에 대한 신뢰성 높은 분류성능을 보였다.
반도체 부품 마크 미세 결함 검사를 위한 패턴 영역 분할 및 인식 방법
장유정(Yuting Zhang),이정섭(Jung-Seob Lee),주효남(Hyonam Joo),김준식(Joon-seek Kim) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.9
To inspect the defects of printed markings on the surface of IC package, the OCV (Optical Character Verification) method based on NCC (Normalized Correlation Coefficient) pattern matching is widely used. In order to detect the micro pattern defects appearing on the small portion of the markings, a Partitioned NCC pattern matching method was proposed to overcome the limitation of the NCC pattern matching. In this method, the reference pattern is first partitioned into several blocks and the NCC values are computed and are combined in these small partitioned blocks, rather than just using the NCC value for the whole reference pattern. In this paper, we proposed a method to decide the proper number of partition blocks and a method to inspect and combine the NCC values of each partitioned block to identify the defective markings.
복합 조직 재생을 위한 자유형상제작기반 Multi-head tissue/organ building system 의 개발
심진형(Jin-Hyung Shim),이정섭(Jung-Seob Lee),김종영(Jong Young Kim),조동우(Dong-Woo Cho) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The aim of this study is to develop an advanced method for regeneration of three dimensional (3D) tissue or organ. The multi ?-head tissue/organ building system (MtoBS) which can deposit two or more biomolecules and various synthetic biomaterials was developed to regenerate heterogeneous tissue. The MtoBS possessing 6 heads was developed to build 3D pre-tissue in which structural, physiological, and anatomical factors were considered. Two heads are designed for synthetic biomaterials as a framework, another two are for cell dispensing, and the others are for protein dispensing. Feasibility of MtoBS for building 3D pre-tissue was shown by dispensing three different biomaterials into one structure. It was proved that position and volume control of two different hydrogel were controllable in the MtoBS. In conclusion, the MtoBS is expected to be a promising system for regeneration of heterogeneous tissue.
골 조직공학을 위한 자유형상제작 방식의 3차원 인공지지체 제작 및 In Vitro 특성 평가
심진형 ( Jin Hyung Shim ),이정섭 ( Jung Seob Lee ),김종영 ( Jong Young Kim ) 한국조직공학·재생의학회 2012 조직공학과 재생의학 Vol.9 No.1s
Tissue engineering is an emerging technique which has the potential to regenerate and repair damaged tissues or organs. In this paper, three-dimensional (3D) scaffold fabricated by solid freeform fabrication (SFF) technology and its mechanical property and cell adhesion characteristic were described. Polymer deposition system (PDS), which can dispense biodegradable polymers such as polycaprolactone (PCL) and poly (lactic-co-glycolic acid) (PLGA), was developed to fabricate a 3D scaffold for tissue engineering. In this study, PCL, PLGA, and blended PCL/PLGA were used as scaffolding materials. The dispensing conditions for each polymer were investigated using single-line test. Based on the result of single-line test, 3D scaffolds with fully interconnected 600 im pores were successfully fabricated by the PDS. Overall size of the scaffold was fixed at 25£ ̄10£ ̄4 mm which was targeted for application to spine regeneration. Effect of PCL, PLGA, and blended PCL/PLGA on compressive mechanical property of scaffolds was analyzed. In addition, in vitro cell interactions of scaffolds on MC3T3-E1 cells were evaluated using cell counting kit assay.
FPD용 컬러 필터의 수지 얼룩 결함 형상화에 관한 연구
권오민(Oh-Min Kwon),이정섭(Jung-Seob Lee),박덕천(Duckchun Park),주효남(Hyonam Joo),김준식(Joon-Seek Kim) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.8
Detecting defects on FPD (Flat Panel Display) color filter before the full panel is made is important to reduce the manufacturing cost. Among many types of defects, the low contrast blemish such as Suzi Mura is difficult to detect using standard CCD cameras. Even skilled inspectors in the inspection line can hardly identify such defects using bare eyes. To overcome this difficulty, point spectrometer has been used to analyze the spectrum to differentiate such defects [rom normal color fillers. However, scanning ever increasing-size color filters by a point spectrometer takes too long time to be used in real production line. We propose a system using a spectral camera which can be viewed as a line scan camera composed of an array of point spectrometers. Three types of lighting system that exhibit different illumination spectrums are devised together with a calibration method of the proposed spectral camera system. To visualize the defect areas, various processing algorithms to identify and to enhance the small differences in spectrum between defective and normal areas are developed. Experiments shows 85% successful visualization of real samples using the proposed system.
박정훈(Jeong Hun Park),이정섭(Jung Seob Lee),주영훈(Young Hoon Joo),강현욱(Hyun-Wook Kang),조동우(Dong-Woo Cho) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
For patients with tracheal resection, various composite scaffolds have been developed and applied for tracheal defect repair in animal models. And artificial prostheses consisting of a polypropylene mesh tube reinforced with a polypropylene spiral have been developed and applied clinically. In this study, a novel three-dimensional (3D) bellows scaffold with high flexibility and biodegradability was developed for tracheal reconstruction. And the flexibility of the bellows scaffold against compression was evaluated using finite element method (FEM) simulation. The bellows scaffold was fabricated by indirect micro-stereolithography technology that combines projection based micro-stereolithography and sacrificial molding process using polycaprolactone (PCL).