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Hyun, Kyounghak,Choi, Joungjoo,Ki, Dongwon,Park, Joonhong,Ahn, Soojeung,Oh, Hyunje,Choung, Youn-Kyoo Informa UK (Taylor Francis) 2016 Desalination and Water Treatment Vol.57 No.2
<P>This study aims to examine the treatment of graywater (GW), especially bathroom wastewater, using subsurface-flow constructed wetlands (CWs) in an apartment complex. It analyzed the removal of organic matters and nitrogen, the status of a wetland by depth, and microbial communities under the conditions of aeration and non-aeration at the inlet section, and planting and non-planting. The results of this study show that aeration at the inlet section and planting affect ORP, , and nitrogen by water flowing distance and water depth in a wetland. The result of CODcr removal seems to satisfy the Korean standard (below 20mg/L (CODmn)) of reuse water quality in all three operational conditions. The aeration at the inlet section has the advantages of effectively removing organic matters at the inlet section, thus preventing its clogging, and removing nitrogen through the nitrification. Aeration at the inlet section and planting are expected to have a positive effect on the wetland status and GW treatment. Therefore, aeration at the inlet and planting will be helpful to construct and operate an artificial wetland in residential areas such as a multi-family housing complex. Ammonia-oxidizing bacteria including Nitrosomonas, Nitrosospira, Nitrosococcus and denitrifying or nitrate-reducing bacteria such as Thiobacillus, Achromobacter, Pseudomonas, Micrococcus belong to the classes of -proteobacteria, -proteobacteria, and Actinobacteria. These microbial communities found in this study seem to contribute to nitrogen removal. But, the roles of microbial community in CWs need to be further investigated, both qualitatively and quantitatively.</P>
김경학(Kyounghak Kim),방한서(Hansur Bang),방희선(Heeseon Bang),Alexander F. H. Kaplan,Jonas Nasstrom,Jan Frostevarg 대한용접·접합학회 2016 대한용접·접합학회지 Vol.34 No.5
In this study, Hot-wire laser welding (HWLW) without keyhole which deposits filler material by feeding hot wire into the process zone has been performed to increase process performance. From the analysis of High Speed Imaging (HSI), for higher voltage, the process is prone to arc formation and drop transfer, which is disagreeable transfer mode. It is necessary that arc formation and drop (globular) transfer should be avoided by lower voltage. Therefore, continuous wire melting and transfer mode is preferred when adopting this process. The HWLW technique has high potential in terms of performance, precision, robustness and controllability for thick section of narrow gap.
내로우 갭 적용을 위한 핫와이어 송급 레이저용접 - 고속촬영을 통한 와이어 용융/이행 현상과 아크 포메이션 분석 -
Kim, Kyounghak,Bang, Hansur,Bang, Heeseon,Kaplan, Alexander F.H.,Nasstrom, Jonas,Frostevarg, Jan 대한용접접합학회 2016 대한용접·접합학회지 Vol.34 No.5
In this study, Hot-wire laser welding (HWLW) without keyhole which deposits filler material by feeding hot wire into the process zone has been performed to increase process performance. From the analysis of High Speed Imaging (HSI), for higher voltage, the process is prone to arc formation and drop transfer, which is disagreeable transfer mode. It is necessary that arc formation and drop (globular) transfer should be avoided by lower voltage. Therefore, continuous wire melting and transfer mode is preferred when adopting this process. The HWLW technique has high potential in terms of performance, precision, robustness and controllability for thick section of narrow gap.
신현일(Hyunil Shin),정경학(Kyounghak Jung),송일선(Ilsun Song),최호진(Hojin Choi),백종문(Jongmoon Baik) 한국정보과학회 2007 정보과학회논문지 : 소프트웨어 및 응용 Vol.34 No.8
개발자 개개인의 소프트웨어 개발 프로세스를 개선시켜 소프트웨어의 품질을 향상시킬 수 있도록 돕는 기법으로 PSP(Personal Software Process)가 널리 쓰이고 있다. PSP에 제시된 측정 및 분석 활동을 지속적으로 수행함으로써 개별 개발자는 자신의 개발 프로세스에 내재된 약점을 파악할 수 있고, 이렇게 수집된 과거 프로젝트의 데이타를 이용하여 공수와 품질에 대한 예측의 정확도를 높일 수 있다. 그러나 수동으로 행해지는 데이타 수집의 오버헤드와 개발작업-측정작업 간의 문맥전환에 따른 집중력 분산의 문제점으로 인해 신뢰도 높은 데이타를 수집하기가 쉽지 않은 것이 현실이다. 한편, PSP에 제시된 문서형태의 프로세스 가이드는 프로세스 정보 검색의 불편함과 추가적인 정보를 삽입하는 데 어려움을 가지고 있다. 본 논문에서는 이러한 문제점들을 해결하기 위해 개발된 PSP 지원도구를 소개한다. 개발된 도구는 데이타 수집의 신뢰성을 높이기 위해 데이타 자동 수집 기능을 제공하고, PSP 프로세스 정보의 효율적인 검색을 위한 EPG(Electronic Process Guide) 기능 및 추가적인 프로세스 정보의 저장을 위한 경험 저장소 기능을 제공한다. The PSP (Personal Software Process) is developed to help developers make high-quality products through improving their personal process. With consistent measurement and analysis activity that the PSP suggests, developers can identify process deficiencies and make reliable estimates on effort and quality. However, due to the high-overhead and context-switching problem of manual data recording, developers have difficulties in collecting reliable data, which can lead wrong analysis results. On the other hand, the paper-based process guides of the PSP are inconvenient to navigate its process information and difficult to attach additional information. In this paper, we introduce a PSP supporting tool developed to handle these problems. The tool provides automated data collection facilities to help acquire reliable data, an EPG (Electronic Process Guide) for the PSP to provide easy access and navigation of the process information, and an experience repository to store development experience as additional information about the process.
A Study on HBT MMIC Doherty PA with impedance-inverting Structure
Jeong-Seok Jang,Kyounghak Lee 한국정보통신학회 2015 2016 INTERNATIONAL CONFERENCE Vol.7 No.1
In this paper, improvement of performances in HBT MMIC PAs are studied. Using impedance-inverting Doherty structure, we improved efficiency and linearity of PAs. The impedance inverter with discrete Inductance and Capacitance has LPF(Low Pass Filter) structure. An inductance, which is difficult to acquire within a chip. So we implement by combining with external inductor after a thorough analysis of wire-bonding and lead inductance. In the measurement results, it shows P1dB characteristic of 30.33dBm, efficiency characteristic of 32.29%@6dB back-off and 25.095%@10dB. And it has OIP3 characteristics of 42 and NF of 3.47.
LID관련 지방정부 조례제정 특성 기초연구 -서울시, 수원시, 남양주시를 중심으로-
이미홍 ( Mihong Lee ),한양희 ( Yanghui Han ),현경학 ( Kyounghak Hyun ),임석화 ( Seokhwa Lim ) 한국환경영향평가학회 2016 환경영향평가 Vol.25 No.1
This study suggests direction of new ordinance establishment for the future national application of Low Impact Development(LID) by analyzing current LID-related regulations of local governments, substantial agents to install and maintain a facility, through qualitative and quantitative methodologies. Four key words related to LID were derived from advisory conference and then ninety nine ordinances as the LID-related regulations were extracted to analyze. The study shows that rainwater-related ordinance passed in the middle of 2000s are being merely converted to the law on the promotion and support of water reuse. Regulations on water cycle and LID exist only in three cities nationwide(Seoul City, Suwon City and Namangju City). Interview with administrators of three cities to have LID-related regulations revealed following results. First, both rainwater and water reuse related regulations have not considered regional characteristics such as rainfall intensity, effects of impervious and merely followed guidelines by Ministry of Government Administration and Home Affairs. Second, existing ordinance is confined to specific facilities and thus cannot include the concept of LID which covers land and space utilization. Therefore, for proper application of LID, this study proposes issue of ordinance that resembles Seoul City ordinance and a new guideline that can reflect regional characteristics such as rainfall and location.
A Study on SPO triple-based ordinary skill extraction using document frequency
Jin-Woo Kim,Song-Ho Lee,Kyounghak Lee 한국정보통신학회 2015 2016 INTERNATIONAL CONFERENCE Vol.7 No.1
This paper proposes a method to extract ordinary skill from patent data which is one of the important elements for judging patentability. We take SPO triple to represent technical terms in patents and consider the document frequency of them to identify ordinary skill.