졸겔법에 의한 PET 직물의 $TiO_2$ 나노 코팅

장진호,손정아,Jang, Jin-Ho,Son, Jung-A 한국섬유공학회 2008 한국섬유공학회지 Vol.45 No.4

The photografted PET fabrics with MAPTMS immersed in aqueous titanium (IV) isopropoxide (TTIP) solution was gelled under acidic condition via hydrolysis and condensation reactions, which produce a nano coating of TiO_2$ on the PET fabrics less than a diameter of 200nm. With increase in gellation time, nano $TiO_2$-coated fabrics showed decreased reflectance at the visible region particularly at 440 nm. Also $TiO_2$-containing fabrics became more susceptible to thermal degradation above $470^{\circ}C$. The PET fabrics containing $TiO_2$ nanoparticles showed better photocatalytic properties such as the photobleaching of methylene blue and ammonia deodorization in comparison with the untreated and grafted PET fabrics. The UV-induced degradation occurred during photobleaching of methylene blue solution, which was more pronounced in the ases of grafted and nano-coated samples.

[3-(Methacryloylamino)propyl]trimethylammonium chloride의 연속식 광그라프트에 의한 PET 직물의 양이온화

장진호,손정아,Jang, Jin-Ho,Son, Jung-A 한국섬유공학회 2007 한국섬유공학회지 Vol.44 No.6

PET fabrics were photografted under continuous UV irradiation with [3-(methacryloylarnino)propyl]trimethylammonium chloride (MAPTA) and 4-benzoylbenzyltrimethyl ammonium chloride (BTC) as a cationic monomer and a photoiniotiator, respectively. It was found that the optimal grafting was obtained when PET fabrics were irradiated with a D-bulb in a UV energy of $35\;J/cm^2$, on which were padded with an aqueous formulation of 3% photoinitiator concentration in advance. The surface of the grafted PET was characterized using FT-IR (ATR), ESCA, zeta potential measurement, water retention value (WRV). ATR and ESCA analysis, indicating significant alterations on chemical structure and atomic composition of increasing nitrogen content with increasing grafting yield. The zeta potentials changed from -4.9 mV for the untreated PET up to +16.7 mV for the grafted sample. The photografted fabrics showed an higher water absorbancy as indicated by the increased water retention value compared to the untreated PET. SEM images showed that PET surface was covered with the grafted cationic polymer.

착색 방법 변화가 편광필름의 광학특성에 미치는 영향

장진호,구광회,백상현,박상봉,박일현,최이준,Jang Jin-Ho,Koo Gwang-Hoe,Back Sang-Hyun,Park Sang-Bong,Park Il-Hyun,Choi E-Joon 한국섬유공학회 2006 한국섬유공학회지 Vol.43 No.3

Four kinds of polarizing film were prepared by two coloration methods of dipping and dyeing using either iodine or dye as a dichroic colorant. The optical properties of the polarizing films were compared at various concentrations of dichroic colorants and draw ratios. While iodine of low substantivity to PVA film showed little dependence of colorant content on the coloration methods, in the dye-type polarizing film dyeing method caused higher surface and bulk colorant contents than dipping method due to higher substantivity of the dichroic direct dye. However surface dichroic colorants on the film exhibited higher effectiveness in terms of observed optical properties compared with bulk dichroic colorants in the PVA film. While dye-type polarizing film showed excellent resistance to heat and humidity compared to iodine-type, coloration method did not influence significantly the optical durability of dye-type polarizing film under hot and humid condition.

선박 및 해양 구조물 설계에 관한 국제회의 PRADS에 대하여

장진호,Jang, Jin-Ho 선박안전기술공단 1999 선박안전 Vol.2 No.-

근사 곡률을 이용한 3차원 치아 모델의 기하학적 특징 검출

장진호,유관희,Jang, Jin-Ho,Yoo, Kwan-Hee 한국정보처리학회 2003 정보처리학회논문지 A Vol.10 No.2

최근 몇 년간 의학 분야에서는 인체의 해부학적 구조를 컴퓨터 그래픽스 기술을 통해 컴퓨터로 재구성하려는 많은 시도가 있었다. 이러한 시도는 치의학 분야에서도 이루어져 왔으며, 여러 분야에 응용되고 있다. 예를 들어, 치과 자료의 3차원 가시화와 측정, 임플란트 식립 위치 찾기, 보철학에서 인공치아 재건을 위한 곡면 재구성과 교정학에서 치아의 재위치 등이 그 예이다. 본 논문에서는 이들 치의학 응용 분야에서 가장 중요하게 사용되고 있는 교두, 능선, 열구 및 피트와 같은 치아의 기하학적인 특징을 검출하기 위한 기법을 제시한다. 제안된 방법은 석고 모형의 3차원 입력으로 만들어진 3차원 치아 모델에서 계산된 근사 곡률에 기초한다. 제안된 방법을 사용하여 검출된 결과는 기하학적인 특징을 보여주며, 제안한 방법과 다른 기존의 방법의 가시적 비교를 통해, 제안한 방법이 좀더 정확한 기하학적인 특징을 검출하는데 유용하게 사용될 수 있음을 알았다. In the latest medical world, the attempt of reconstructing anatomical human body system using computer graphics technology awakes people's interests. Actually, this trial has been made in dentistry too. There are a lot of practicable technology fields using computer graphics in dentistry For example, 3D visualization and measurement of dental data, detection of implant location, surface reconstruction for restoring artificial teeth in prostheses and relocation of teeth in orthodontics can be applied. In this paper, we propose methods for definitely detecting the geometric features of teeth such as cusp, ridge, fissure and pit, which have been used as most important characteristics in dental applications. The proposed methods are based on the approximate curvatures that are measured on a 3D tooth model made by scanning an impression. We also give examples of the geometric features detected by using the proposed methods. Comparing to other traditional methods visually, the methods are very useful in detecting more accurate geometric features.

대학과 인간교육

장진호,Jang, Jin-Ho 한국대학교육협의회 1985 大學敎育 Vol.15 No.-

재구성이 가능한 범용 DSM-CC 아키텍처와 사용자 선호도 기반의 캐시 관리 전략

장진호,고상원,김정선,Jang, Jin-Ho,Ko, Sang-Won,Kim, Jung-Sun 한국정보처리학회 2010 정보처리학회논문지 C : 정보통신,정보보안 Vol.17 No.1

GEM(Globally Executable MHP) 기반의 MHP(Multimedia Home Platform), OCAP(OpenCable Application Platform), ACAP(Advanced Common Application Platform) 등은 현재 디지털 방송의 대표적인 미들웨어이다. 이러한 미들웨어에 사용된 MPEG-2와 DSM-CC(Digital Storage Media-Command and Control) 프로토콜 표준은 많은 부분이 유사하다는 특징을 가지고 있지만 각 DTV 미들웨어가 필요로 하는 정보와 데이터 구조가 조금씩 차이가 있다. 이는 결과적으로 미들웨어간의 비호환성을 야기한다. 본 논문에서는 다양한 미들웨어 표준을 모두 지원할 수 있는 통합 DTV 미들웨어를 개발하기 위한 노력의 일환으로써, 재구성이 가능한 범용 DSM-CC 아키텍처를 제안한다. 첫째, 모든 GEM 기반의 미들웨어가 공통적으로 필요로 하는 DSM-CC 컴포넌트를 정의하였다. 둘째, 각 미들웨어가 필요로 하는 정보와 데이터 구조를 XML 형태로 정의하여 별도의 수정 없이 정적, 혹은 동적으로 특정 미들웨어에 맞추어 적용할 수 있도록 하였다. 또한, 셋탑박스의 전체적인 성능과 연관성이 높은 어플리케이션 응답시간과 DSM-CC 모듈의 사용빈도를 향상시키기 위해 사용자의 선호도를 고려한 캐시 관리 전략을 제안하고, 제안된 캐시 관리 전략이 응답시간을 줄이는데 효과적임을 실험을 통해서 확인하였다. In current digital broadcasting systems, GEM(Globally Executable MHP)-based middlewares such as MHP(Multimedia Home Platform), OCAP(OpenCable Application Platform), ACAP(Advanced Common Application Platform) are the norm. Despite much of the common characteristics shared, such as MPEG-2 and DSM-CC(Digital Storage Media-Command and Control) protocols, the information and data structures they need are slightly different, which results in incompatibility issues. In this paper, in line with an effort to develop an integrated DTV middleware, we propose a general-purpose, reconfigurable DSM-CC architecture for supporting various standard GEM-based middlewares without code modifications. First, we identify DSM-CC components that are common and thus can be shared by all GEM-based middlewares. Next, the system is provided with middleware-specific information and data structures in the form of XML. Since the XML information can be parsed dynamically at run time, it can be interchanged either statically or dynamically for a specific target middleware. As for the performance issues, the response time and usage frequency of DSM-CC module highly contribute to the performance of STB(Set-Top-Box). In this paper, we also propose an efficient application cache management strategy and evaluate its performance. The performance result has shown that the cache strategy reflecting user preferences greatly helps to reduce response time for executing application.

고속 페이딩 채널에 적합한 SFBC SC-FDE 시스템 연구

장진호(Jin-Ho Jang),원희철(Hui-Chul Won),임기홍(Gi-Hong Im) 한국통신학회 2004 한국통신학회 학술대회논문집 Vol.2004 No.11

한국 재벌과 ‘무책임의 경제’

장진호(Jang, Jin-ho) 역사비평사 2014 역사비평 Vol.- No.108

Today chaebols, Korea’s industrial conglomerates, have grown to be not only domestic players, but also global ones in business over the past half-decade. Some find the origins of chaebols in the colonial or early post-liberation period, but chaebols began to take basic forms with the implementation of the heavy and chemical industrialization (HCI) drive during the 1970s, being a junior partner of the developmental state. The relationship between the state and chaebols began to change from the 1980s, and the Korean people have heard phrases like the “chaebol republic” or the “Samsung republic” since the 1990s. This means that nowadays chaebols have a huge influence not only in the economy but also in political, social and cultural affairs. Today, chaebols are considered to be an equal player or even a dominant one vis-a-vis the state. However, although the growth of the chaebols has been aided by the Korean people in many ways, they neither recognize this nor take any responsibility for it. The results are a deepening of socio-economic problems related with the “economy of irresponsibility,” such as cronyism, economic rent-seeking, wealth concentration, labor exclusion, and the chaebols’ dominance in society. Problems associated with the neo-liberal transformation of the Korean economy since the 1997 crisis have also been caused or exacerbated by the chaebols’ increasing influence and dominance, which necessitates their reform in today’s Korea.

전기장이 인가된 상태에서 전선을 통해 전파하는 화염에 있어서 전선직경의 영향에 대한 실험적 연구

장진호(Jin ho Jang),임승재(Seung Jae Lim),박정(Jeong Park),김민국(Mim Kuk Kim),정석호(Suk Ho Chung),Osamu Fujita 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.5

An experimental study on spreading flame over electrical wire, which is insulated by Polyethylene(PE) and has different diameters, was conducted with applied AC electric fields. The result showed that the flame spread rate decreased in increase of diameter of insulator, and decreased in increase of voltage and frequency for VAC≤ 3 kV. On the other hand, flame spread rate for VAC ≥ 3 kV decreased initially and increased with applied frequency, and then decreased again.