Communications : Analysis of the MSC(Multi-Spectral Camera) Operational Parameters

Sang Soon Yong,Jong Pil Kong,Haeng Pal Heo,Young Sun Kim 大韓遠隔探査學會 2002 大韓遠隔探査學會誌 Vol.18 No.1

The MSC is a payload on the KOMPSAT-2 satellite to perform the earth remote sensing. The instrument images the earth using a push-broom motion with a swath width of 15 km and a GSD(Ground Sample Distance) of 1 m over the entire FOV(Field Of View) at altitude 685 km. The instrument is designed to have an on-orbit operation duty cycle of 20% over the mission lifetime of 3 years with the functions of programmable gain/offset and on-board image data compression/storage. The MSC instrument has one channel for panchromatic imaging and four channel for multi-spectral imaging covering the spectral range from 450nm to 900nm using TDI(Time Delayed Integration) CCD(Charge Coupled Device) FPA(Focal Plane Assembly). The MSC hardware consists of three subsystem, EOS(Electro Optic camera Subsystem), PMU(Payload Management Unit) and PDTS(payload Data Transmission Subsystem) and each subsystems are currently under development and will be integrated and verified through functional and space environment tests. Final verified MSC will be delivered to spacecraft bus for AIT(Assembly, Integration and Test) and then KOMSAT-2 satellite will be launched after verification process through IST(Integrated Satellite Test). In this paper, the introduction of MSC, the configuration of MSC electronics including electrical interface and design of CEU(Camera Electronic Unit) in EOS are described. MSC Operation parameters induced from the operation concept are discussed and analyzed to find the influence of system for on-orbit operation in future.

Preparation of PVDF Membrane by Thermally-Induced Phase Separation

Heo, Chi-Haeng,Lee, Kyung-Mo,Kim, Jin-Ho,Kim, Sung-Soo The Membrane Society of Korea 2007 Korean Membrane Journal Vol.9 No.1

PVDF membrane formation via TIPS was performed for PVDF/DBP and PVDF/DMP systems. PVDF/DBP system showed solid-liquid phase separation behavior, while PVDF/DMP system has liquid-liquid phase separation characteristic as well as solid-liquid phase separation characteristic. PVDF contents and cooling conditions had great influence on structure, and the effects of each parameter were examined. Spherulitic structure was obtained due to the dominant PVDF crystallization. Diluent rejected to the outside of spherulite occupied the surface of the PVDF spherulites to result in the microporous spherulite formation and micro-void between spherulites. PVDF/DMP system had competitive solid-liquid and liquid-liquid phase separation depending on the cooling path.

Real-Time Sofrware Design using VxWorks For MSC(Multi-Spectral Camera) on KOMPSAT-2

Haeng-Pal Heo,Sang-Soon Yong,Jong-Pil Kong,Young Sun Kim,Heong-Sik Youn 제어로봇시스템학회 2001 제어로봇시스템학회 국제학술대회 논문집 Vol.2001 No.10

Design & Test of Stereo Camera Ground Model for Lunar Exploration

Haeng Pal Heo,Jong Euk Park,Sang Youn Shin,Sang Soon Yong 大韓遠隔探査學會 2012 大韓遠隔探査學會誌 Vol.28 No.6

Space-born remote sensing camera systems tend to be developed to have very high performances. They are developed to provide extremely small ground sample distance, wide swath width, and good MTF (Modulation Transfer Function) at the expense of big volume, massive weight, and big power consumption. Therefore, the camera system occupies relatively big portion of the satellite bus from the point of mass and volume. However, the camera systems for lunar exploration don‘t need to have such high performances. Instead, it should be versatile for various usages under various operating environments. It should be light and small and should consume small power. In order to be used for national program of lunar exploration, electro-optical versatile camera system, called MAEPLE (Multi-Application Electro-Optical Payload for Lunar Exploration), has been designed after the derivation of camera system requirements. A ground model of the camera system has been manufactured to identify and secure relevant key technologies. The ground model was mounted on an aircraft and checked if the basic design concept would be valid and versatile functions implemented on the camera system would worked properly. In this paper, results of design and functional test performed with the field campaigns and air-born imaging are introduced.

Design & Test of Stereo Camera Ground Model for Lunar Exploration

Heo, Haeng-Pal,Park, Jong-Euk,Shin, Sang-Youn,Yong, Sang-Soon The Korean Society of Remote Sensing 2012 大韓遠隔探査學會誌 Vol.28 No.6

Space-born remote sensing camera systems tend to be developed to have very high performances. They are developed to provide extremely small ground sample distance, wide swath width, and good MTF (Modulation Transfer Function) at the expense of big volume, massive weight, and big power consumption. Therefore, the camera system occupies relatively big portion of the satellite bus from the point of mass and volume. However, the camera systems for lunar exploration don't need to have such high performances. Instead, it should be versatile for various usages under various operating environments. It should be light and small and should consume small power. In order to be used for national program of lunar exploration, electro-optical versatile camera system, called MAEPLE (Multi-Application Electro-Optical Payload for Lunar Exploration), has been designed after the derivation of camera system requirements. A ground model of the camera system has been manufactured to identify and secure relevant key technologies. The ground model was mounted on an aircraft and checked if the basic design concept would be valid and versatile functions implemented on the camera system would worked properly. In this paper, results of design and functional test performed with the field campaigns and air-born imaging are introduced.

The Ground Checkout Test of OSMI on KOMPSAT-1

Sang Soon Yong,Hyung Sik Shim,Haeng Pal Heo,Young Min Cho,Kyoung Hwan Oh,Sun Hee Woo,Hong Yul Paik 大韓遠隔探査學會 1999 大韓遠隔探査學會誌 Vol.15 No.4

Ocean Scanning Multispectral Imager (OSMI) is a payload on the KOMPSAT satellite to perform global ocean color monitoring for the study of biological oceanography. The instrument images the ocean surface using a wisk-broom motion with a swath width of 800km and a ground sample distance (GSD) of <1km over the entire field of view (FOV). The instrument is designed to have an on-orbit operation duty cycle of 20% over the mission lifetime of 3 years with the functions of programmable gain/offset and on-board image data compression/storage. The instrument also performs sun and dark calibration for on-board instrument calibration. The OSMI instrument is a multi-spectral imager covering the spectral range from 400nm to 900nm using CCD Focal Plane Array (FPA). The ocean colors are monitored using 6 spectral channels that can be selected via ground commands. KOMPSAT satellite with OSMI was integrated and the satellite level environment tests including instrument aliveness/functional test, such as launch environment, on-orbit environment (Thermal/Vacuum) and EMI/EMC test were performed at KARI. Test results met the requirements and the OSMI data were collected and analyzed during each test phase. The instrument is launched on the KOMPSAT satellite on December 21,1999 and is scheduled to start collecting ocean color data in the early 2000 upon completion of on-orbit instrument checkout.

Morphological Redescription of the Rare Caprellid Protogeton incertus (Crustacea: Amphipoda: Caprellidae) from Korea

Heo, Jun-Haeng,Hong, Soon-Sang,Kim, Young-Hyo The Korean Society of Systematic Zoology 2016 Animal Systematics, Evolution and Diversity Vol.32 No.2

Protogeton incertus Mayer, 1903 belonging to the family Caprellidae was collected from the South Sea, Korea. This species is very similar to Protogeton inflatus Mayer, but it is only distinguishable by the presence of biarticulate mandibular palp. Previous studies provided a very brief description of the species and lacked detailed illustration. In this study, the Korean Protogeton incertus is fully illustrated based on the mature and immature specimens.

TFN model application for hourly flood prediction of small river

Sung, Ji Youn,Heo, Jun-Haeng 한국수자원학회 2018 한국수자원학회논문집 Vol.51 No.2

시계열 데이터를 활용하는 모형은 신뢰할 수 있는 자료를 확보한 경우에는 모형 구축이 용이하고 예측 선행 시간 확보를 위해 신속한 모의가 가능한 장점 때문에 규모가 작은 하천의 홍수예측 모형으로 고려할 수 있다. 이 중 Transfer Function Noise (TFN) 모형은 이탈리아, 영국 등 해외에서는 1970년대부터 시간단위 자료를 이용한 하천유량 예측에 적용되었으나, 우리나라에서는 주로 일 단위 혹은 월 단위의 하천유량 모의에 적용되었다. 국내 수문 자료의 품질 향상으로 그동안 축적된 수문자료를 통해 시간단위 자료를 이용한 홍수예측 모형의 구축 기반이 갖추어졌다. 본 연구의 목적은 소규모 하천을 대상으로 외생변수의 반영이 가능하고 동적시스템과 오차항을 결합하여 예측 오차를 줄이는데 용이한 TFN 모형을 구축하고 그 적용성을 검토하는 것이다. 이를 위해 1시간 단위 자료를 이용하여 TFN 모형을 구축하였으며 구축된 모형을 이용한 홍수 예측 결과를 홍수예보 실무에 활용 중인 저류함수모형의 홍수 예측 결과와 비교하였다. 비교 결과 홍수사상에 따라 TFN 모형과 저류함수 모형이 각각 더 나은 결과를 보이는 사상이 있었으며, 실무에서 TFN 모형을 홍수예측 모형으로 활용할 수 있을 것으로 판단하였다. The model using time series data can be considered as a flood forecasting model of a small river due to its efficiency for model development and the advantage of rapid simulation for securing predicted time when reliable data are obtained. Transfer Function Noise (TFN) model has been applied hourly flood forecast in Italy, and UK since 1970s, while it has mainly been used for long-term simulations in daily or monthly basis in Korea. Recently, accumulating hydrological data with good quality have made it possible to simulate hourly flood prediction. The purpose of this study is to assess the TFN model applicability that can reflect exogenous variables by combining dynamic system and error term to reduce prediction error for tributary rivers. TFN model with hourly data had better results than result from Storage Function Model (SFM), according to the flood events. And it is expected to expand to similar sized streams in the future.

Active Targeting of Tumor Cells using Light Emitting Bacteria

( Sung Min Moon ),( Jung Joon Min ),( Yeong Jin Hong ),( Hyun Ju Kim ),( Uyenchi N. Le ),( Joon Haeng Rhee ),( Ho Chun Song ),( Young Jun Heo ),( Hee Seung Bom ),( Hyon E. Choy ) 대한핵의학회 2004 핵의학 분자영상 Vol.38 No.5

Serum Obestatin/Ghrelin Ratio Is Altered in Patients after Distal Gastrectomy

Kim, Sung,Lee, Jun Haeng,Heo, Jin Seok,Kwak, Min Jung,Kim, Su Jin,Sohn, Young Bae,Kim, Sang Eun,Song, Sang Yong,Choe, Yon Ho,Baek, Ji Won,Rha, Mi Yong,Oh, Yoo Joung,Jin, Dong-Kyu S. Karger AG 2009 Digestive surgery Vol.26 No.2

<P><I>Background/Aims:</I> Ghrelin is a peptide hormone produced mainly in the stomach, and obestatin is derived by proteolytic cleavage of the ghrelin prepro-hormone. The aim of this study was to determine the postoperative serial changes in these hormones and whether hyperplasia of ghrelin-expressing cells occurs in the remnant stomach. <I>Methods:</I> We prospectively analyzed serial serum samples of 45 early gastric cancer patients and remnant stomach samples of 24 patients. <I>Result:</I> The serum obestatin level on day 2 was lower than that on day 0, and it subsequently returned to the level observed on day 0. In contrast, the serum ghrelin level was lower on days 120 and 210 than on day 0. Eventually, the obestatin/ghrelin ratio was significantly high on day 210 (p = 0.0003). Moreover, we did not observe an increase in the number of ghrelin-expressing cells. The number of ghrelin-expressing cells correlated with the serum ghrelin level. <I>Conclusion:</I> The serum level of obestatin and ghrelin exhibits a different time course in patients who have undergone gastrectomy, and there was no ghrelin-expressing cell hyperplasia in the remnant stomach despite the decrease in serum ghrelin.</P><P>Copyright © 2009 S. Karger AG, Basel</P>