Computational fluid dynamics modeling of high temperature air combustion in an heat recovery steam generator boiler

Abhas Khoshhal,Masoud Rahimi,Afshar Ghahramani,Ammar Abdulaziz Alsairafi 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.5

This paper reports a numerical study on the possibility of using high temperature air combustion (HiTAC)technique in the heat recovery steam generator (HRSG) boiler of the Fajr Petrochemical Complex, Iran. For this purpose a theoretical fuel nozzle which operates in HiTAC mode of combustion has been installed and modeled using the computational fluid dynamics (CFD) technique. By aim of establishing an efficient heat transfer rate to the boiler’s tubes, the proper nozzle location and an optimum mass flow rate of fuel have been found. The results show that by using this modification it is possible to increase the steam temperature up to 37 percent.

Analysis on Vegetation Phenology Characteristics of Landslide - Focused on Manaslu Conservation Area, Gorkha District of Nepal -

Abhas Maskey,Jong Hoon Park,Seung Gyu Jeong 한국인간·식물·환경학회 2016 인간식물환경학회지 Vol.19 No.1

This paper presents a study to identify the relationship between vegetation phenology and landslide using remote sensing to access landslide prone areas in an event of an earthquake. A landslide triggered after the April 2015 earthquake in Manaslu Conservation Area in Gorkha District of Nepal was used as a study site. The method proposed in the paper uses pre- and post-event LANDSAT8 Operational Land Imager (OLI) images and uses Normalized Difference Vegetation Index (NDVI) for understanding the correlation between vegetation phenology of the study site to the landslide. Comparative study of the result shows lower NDVI mean value after the earthquake and shows that a slope with NDVI mean value lower than 0.247 could be landslide prone. Implication of the result, if confirmed, could aid in identifying landslide prone areas and implementing mitigation programs to either re-vegetate the slope or relocate residents directly under threat.

SNUSAT Mission and System for CanSat Competition Korea 2014

Abhas Maskey,Ju Hyeon Kim,Hee Jae Gwon,Ji Hyun Park,Jae Young Lim,In-Seuck Jeung 한국항공우주학회 2014 한국항공우주학회 학술발표회 논문집 Vol.2014 No.11

Seoul National University’s small satellite group, the SNUSAT, participated in SaTRec’s annual CanSat Competition Korea 2014. In an attempt to differentiate from previous missions in the past and to incorporate more complexity in the design and development process, SNUSAT group for this year decided to take panoramic 360° images for search and rescue operations. This paper discusses the mission and system development while remarking on the hurdles and challenges the group had to face on the road to the final competition.

On-Board Computer Hardware Design using ARM Cortex M4 Processors

Abhas Maskey(압하스),Ji Hyun Park(박지현),Vishnu Anand Muruganandan(비슈누),In-Seuck Jeung(정인석) 한국항공우주학회 2016 한국항공우주학회 학술발표회 논문집 Vol.2016 No.4

Seoul National University is developing an On-Board Computer (OBC) based on ARM Cortex M4 processors from STMicroelectronics. The microcontroller (MCU) has the capacity to run at 180㎒ maximum frequency, has a Floating Point Unit (FPU) and has a performance of 225DMIPS. The nominal power consumption while all peripherals are activated is 323.4㎽ and can has low power modes to conserve power. The processor is supported by a flight tested STM32F405RG processor as a node for in-orbit firmware update and fault detection. The OBC also features as the Attitude Determination and Control System (ADCS), and has an 8MB SDRAM for dynamic data while supporting 8MB of flash memory and backup of 4GB memory through microSD card. The ADCS can drive up to 4 magnetorquers (MTQs). The OBC has a flexible design and the same design has been applied for imaging payload.

자폐 범주성 장애 아동의 인지발달 향상을 위한 키넥트 기반 기능성 게임 개발

김성인(Sung-In Kim),Abhas Maskey,염경탁(Kyeong Tak Youm),박호준(Ho Jun Park),이제석(Je Seok Lee),은진수(Jin Su Eun),변지민(Ji Min Byun),신동평(Dong-Pyoung Sheen),이건우(Kunwoo Lee) 한국HCI학회 2014 한국HCI학회 학술대회 Vol.2014 No.2

본 논문에서는 자폐 범주성 장애 아동의 인지발달 향상을 위해서 키넥트 기반 기능성 게임을 제시한다. 하드웨어는 자폐 범주성 아동이 자연스러운 인터랙션을 할 수 있도록 움직임 인식 센서인 키넥트(Kinect)와 아동의 신체운동 능력 향상을 위한 컨트롤러로 구성된다. 소프트웨어는 자폐 범주성 아동의 인지발달 요인 중 시운동, 시지각 요인을 복합적으로 반영하기 위해 여러 스테이지로 구성되며, 각 요인을 점진적으로 발달시키기 위해서 다양한 레벨을 가지게 된다. 게임 사용 후 자폐 범주성 장애 아동의 인지발달 향상을 확인해보기 위해서 DTPV-2를 제안해본다. We introduce a serious game for improving the cognitive development in children with Autism Spectrum Disorder (ASD). The hardware of the game consists of a Kinect, a motion capture sensor, which enables interact with ASD children naturally, and a controller to enhance their ability to exercise. The game has several stages which are envolved with visual motor and visual perception components for cognitive development, and various difficulty levels which make it possible to improve each ability progressively. Finally, we suggest DTPV-2 evaluation method to test how much the cognitive development in children with ASD is improved after their using the game.

Facing battery issues when launching to the International Space Station

Ji Hyun Park(박지현),Abhas Maskey(압하스),Vishnu Anand Muruganandan(비슈누),In-Seuck Jeung(정인석) 한국항공우주학회 2016 한국항공우주학회 학술발표회 논문집 Vol.2016 No.4

큐브위성의 경우, 프로젝트 기간 내에 발사를 하기 위해 모든 발사 방법에 대해 대비 하는 것이 중요하다. 큐브위성은 보통 다른 탑재체와 함께 발사 되는 경우가 대부분이고, 이 때 큐브위성 입장에서 선호되는 발사체로 우주에 나가는 경우는 찾기 힘들기 때문이다. 최근, 2012년부터 큐브위성을 국제우주정거장에서 발사하기 시작했으며, 최근까지 약 110개 이상의 큐브위성이 발사 될 만큼 국제우주정거장에서의 큐브위성 발사는 보편화 되었다고 볼 수 있다. 다만, 국제우주정거장은 유인우주프로그램으로 안전관련 요구사항이 추가된다. 본 논문은 국제우주정거장 관련 요구사항 중 배터리 요구사항을 중점으로 국제우주정거장 배터리 요구사항을 고려하지 않은 큐브위성의 문제점을 다룬다. SNUSAT-1 큐브위성을예로 국제우주정거장 배터리 요구사항이 만족하지 않은 경우와, 이 때의 문제점과 해결방안을 소개한다. SNUSAT-1 프로젝트 진행에 적합한 방안을 제시하고 그 결과 새로 개발된 배터리를 소개한다. For CubeSats, it is important to be ready for any type of launcher for a successful project timeline. This is due to the fact that CubeSats are normally flown as a piggy back ride, so it is unlikely to find a sweet spot in which the launch conditions fit into the CubeSat design if the design does not implement various launchers. Since 2012, the International Space Station (ISS) has become one of the launch solutions, now having launched more than 110 CubeSats into orbit. However, due to the fact that ISS is a human flight program, extra safety requirements must be considered. This paper focuses on the battery requirements that must be taken into consideration, and specifically introduces a case where a CubeSat was not designed to be launched from ISS. The issues that occur when battery requirements are not met is dealt and a solution best meeting the CubeSat project situation is shared. As a result, a new battery board that utilizes ready existing deployment switch in order to meet the safety requirements is presented.

일본 캔위성 리더 교육 프로그램(CLTP)

박지현,임재영,김정은,Abhas Maskey,임한석,이상윤,정인석 한국항공우주학회 2014 한국항공우주학회 학술발표회 논문집 Vol.2014 No.11

Diminishing Procedural Boundaries in International Arbitration

Abha Pareek 한국중재학회 2013 중재연구 Vol.23 No.4

The surge of cross border trade and transactions has seen international arbitration fast emerging as the preferred mode of dispute resolution. This phenomenon is especially remarkable in the Asian region. The Singapore International Arbitration Centre (“SIAC”)aspires to contribute to this growth as one of the leading arbitral institutions. The objective of this article is to provide an insight into the key features of SIAC Rules. This article has been divided into two parts; the first part discusses how the SIAC Rules are helpful in building bridges in international arbitration between the common law and civil law systems. We have attempted to throw light on how the SIAC Rules may be tailored by the parties to bring about a harmonization in the common law and civil law practices in the conduct of the arbitration proceedings. In the second part of the article, we discuss the two most popular procedures introduced in the SIAC Rules in 2010 i.e. ‘Emergency Arbitration’ and ‘Expedited procedures’. The emergency arbitration provisions enable a party to obtain order(s)/award for urgent interim relief(s) upon commencement of arbitral proceedings but pending the constitution of the main Tribunal. The expedited Procedure provisions give parties the option of having their disputes determined in six (6) months from the date of the constitution of the tribunal.

Risk Factors and Symptoms of Uterine Prolapse: Reality of Nepali Women

Abha Sharma,Jing Ping Zhang 숙명여자대학교 아시아여성연구원 2014 Asian Women Vol.30 No.1

The aim of the review was to explore the risk factors and symptoms of uterine prolapse (UP) experienced by Nepali women. The literature review was completed by making use of Pub med, Google Scholar, and Medscape. The prevalence of uterine prolapse was found to be in the range of 10?40%. The grass root causes of UP in Nepal are poverty, illiteracy and male dominated social structure. These causes gender based discrimination, inaccessibility to health services, poor nutrition, early marriage, early pregnancy, multi parity in the need of son, work load during pregnancy and postnatal period, domestic violence, home deliveries, lack of awareness about UP, shyness to explain about reproductive health related problems which in turn leads to uterine prolapse. Women suffering from UP start experiencing a variety of physical symptoms like back ache, difficulty in standing, sitting and walking, difficulty in lifting, vaginal foul smelling discharge/ itching, sore or ulcer in protrusion of tissue, painful intercourse, burning micturition, urinary incontinence, difficulty in passing stool, etc. The psycho?social dimension of life is also affected by having UP. These symptoms affects almost every aspect of women’s daily living hence creating role limitation, physical limitations, social limitations, personal limitations and also psychology of sufferer. All of these finally have direct impact on the quality of life of the women.

Diminishing Procedural Boundaries in International Arbitration

Pareek, Abha The Korean Association of Arbitration Studies 2013 중재연구 Vol.23 No.4

The surge of cross border trade and transactions has seen international arbitration fast emerging as the preferred mode of dispute resolution. This phenomenon is especially remarkable in the Asian region. The Singapore International Arbitration Centre ("SIAC") aspires to contribute to this growth as one of the leading arbitral institutions. The objective of this article is to provide an insight into the key features of SIAC Rules. This article has been divided into two parts; the first part discusses how the SIAC Rules are helpful in building bridges in international arbitration between the common law and civil law systems. We have attempted to throw light on how the SIAC Rules may be tailored by the parties to bring about a harmonization in the common law and civil law practices in the conduct of the arbitration proceedings. In the second part of the article, we discuss the two most popular procedures introduced in the SIAC Rules in 2010 i.e. 'Emergency Arbitration' and 'Expedited procedures'. The emergency arbitration provisions enable a party to obtain order(s)/award for urgent interim relief(s) upon commencement of arbitral proceedings but pending the constitution of the main Tribunal. The expedited Procedure provisions give parties the option of having their disputes determined in six (6) months from the date of the constitution of the tribunal.