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Design of the Ontology Based Retrieval Engine for Managing the Public Control Points
Seonghyun Shin,Yulan Cui,Myunggil Park,Hyunsuk Hwang,Yongcheol Suh,Changsoo Kim 한국멀티미디어학회 2008 한국멀티미디어학회 국제학술대회 Vol.2008 No.-
The spatial information is being more widely used with the development of ubiquitous society and the effective management of control points which are basis of the spatial information is required. The existing management system supports key words and categorized search. However, the ontology-based retrieval system is not only dealing with complex queries but also increasing effective business and convenience. Therefore, this paper proposes the design of the ontology-based retrieval engine including the function of intelligent and personalized search. Our searching engine is able to be applied to current management systems of control points and PDA and Web-based information systems related with control points.
Coordinated Multicast Based on a MIMO Relay Station in a Single Frequency Network
Seonghyun Kim,Sanghoon Lee IEEE 2016 IEEE Transactions on Vehicular Technology VT Vol.65 No.2
<P>In this paper, we present a coordinated multicast scheme via a relay station (RS) over a single frequency network (SFN). According to the type of feedback information delivered from the RS to the adjacent base stations (BSs) involved in the coordinated multicast, the schemes are classified into the phase coordination multicast based on the RS (PCMR) and the vector coordination multicast based on the RS (VCMR). For the performance analysis, we derive the mathematical upper bound of an achievable rate from the BSs to the RS for the coordinated multicast based on RS. Through this analysis, we demonstrate that the PCMR and the VCMR achieve more gains over the noncoordinated multicast in terms of the number of RS antennas, the number of adjacent BSs, and the number of BS antennas. Through simulation, we derive a range of distances between the home BS and the RS, the number of users, and the number of user antennas, providing evidence that the RS-based multicast outperforms the conventional multicast.</P>
Seonghyun Kim,Biju, K P,Minseok Jo,Seungjae Jung,Jubong Park,Joonmyoung Lee,Wootae Lee,Jungho Shin,Sangsu Park,Hyunsang Hwang IEEE 2011 IEEE electron device letters Vol.32 No.5
<P>We investigated the effect of scaling down the device area of WO<I>x</I> resistive random-access memory (RRAM) devices on their switching characteristics. Device dimensions were successfully scaled down to 50 nm using a via-hole structure with additional Al<SUB>2</SUB>O<SUB>3</SUB> sidewall process. As compared to the microscale devices, the nanoscale devices exhibited a distinct switching mechanism and better memory performance, such as improved switching uniformity, larger memory window, and stable endurance characteristics for up to 10<SUP>7</SUP> cycles. This improvement can be explained by a uniform interfacial switching mechanism in nanoscale device; this is in contrast with the defect-induced filamentary switching mechanism observed in microscale devices. In this way, the intrinsic switching properties of RRAMs were obtained by scaling down of the device area, indicating that RRAMs hold considerable promise for future applications.</P>
Seonghyun Yu,장화용,Han Bin Oh 사단법인 한국질량분석학회 2019 Mass spectrometry letters Vol.10 No.4
This study demonstrated the sensitivity of electron capture dissociation mass spectrometry (ECD-MS) to probe sub- tle conformational changes in gaseous melittin ions induced by the substitution of an amino acid. ECD-MS was performed for triply and quadruply-protonated melittin and its variants obtained by a single amino acid substitution, namely, D-Pro14, Pro14Ala, and Leu13Ala. Although native triply-protonted melittin showed only a few peptide backbone cleavage products, the D-Pro14 and Pro14Ala variants exhibited extensive backbone fragments, suggesting the occurrence of a significant structural or conformational change induced by a single amino acid substitution at Pro14. On the contrary, the substitution at Leu13, namely Leu13Ala (+3), did not cause significant changes in the ECD backbone fragmentation pattern. Thus, the sensitivity of ECD-MS is demonstrated to be good enough to probe the aforementioned conformational change in melittin.
Seonghyun Shin,Hyunsuk Hwang,Hojun Na,Changsoo Kim 한국멀티미디어학회 2007 한국멀티미디어학회 국제학술대회 Vol.2007 No.-
GIS has gradually been utilized for personal information as well as for specialized purposes such as traffic control, sight-seeing, tracking services, and disaster services. The GIS applications have been used not only by specialists but also general users through a Web-GIS approach. However, most Web-GIS applications are focused on displaying the stored information on maps, not on providing functions that users can register or modify their preference information on Points of Interests(Pols). Our research aims to present a personalized search technique considering preference attributes using ontologies on a Web-GIS Solution. To do this, we use Smart Client techniques that are amenable to piecing out and lowering of productivity cost. In addition, we design and implement a Life-GIS application which provides users with the personalized results of Pols retrieval on a Web-based GIS application using .Net Smart Client techniques and ontologies.
Effect of temperature on the development of the lesser mealworm, Alphitobius diaperinus
Seonghyun Kim,HaechulPark,IngyunPark 한국응용곤충학회 2017 한국응용곤충학회 학술대회논문집 Vol.2017 No.10
The developmental responses of insects to temperature are important considerations in gaining a better understandingof their ecology and life histories. Temperature dependent models permit examination of the effect of temperature onthe geographical distributions, population dynamics, and management of insects. The measurements of insect developmentaland survival responses to temperature pose practical challenges that depend. The developmental characteristics of A. diaperinuswere investigated at four temperature regimes (20, 25, 30 and 35℃), a relative humidity of 60%, and a light:dark photoperiodof 16:8h. The developmental time from larva to adult was 129.0, 49.8, 40.5 and 31.9 days at temperatures of 20, 25,30 and 35℃, respectively. Pupal rate was 80.0%, 100%, 83.3% and 91.7% at temperatures of 20, 25, 30 and 35 respectively.There is an increasing need for a standardized manual for rearing this. Pupa had significantly lower weights at 35℃than at the other temperatures. Female pupae (20mg) were significantly heavier than male pupae (17mg).
Generation and Distribution of Martian Dust Devils
Seonghyun Kim,Yongjae Yu 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
Generation of vertical swirls of wind on Earth produces tornadoes in large scale and dust devils in small scale. Dust devils have been also recorded in Martian missions. Martian surface is commonly covered by a thin layer of dust, yielding a bright color due to the reflective nature of fine-grained dust particles. As dust devils swipe a thin dust layer, a dark crustal rock surface will be exposed. With time, the exposed rock will be covered by dusts again. There is a moderate correlation between the height and radius of dust devils. It is apparent that wind speed is independent of the volume of dust devils. There is no latitudinal dependence for the morphology of dust devils. However, speed of dust devils displayed a latitudinal dependence. It is interesting that wind speed of dust devils at low latitude is generally faster than those at high latitudes. It is likely that larger daily temperature tide causes faster wind speed at low latitude area.
Optimization and Analysis of Output Pinion Design for Worm Gear Reducer
Seonghyun Cho(조성현),Hyeonkyeong Kim(김현경),Dongseon Kim(김동선),Qin Zhen(진진),Sung-Ki Lyu(류성기) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.1
Pinions are generally heavy and integrated with a shaft. Thus, fabricating a pinion is a material- and machining-intensive task characterized by low productivity. Contact of the output pinion with a sliding surface or a cloud contact causes loss of power because of friction. Consequently, the output pinion undergoes considerable wear and tear at its ends, which adversely affects the overall transmission efficiency of decelerators. To improve transmission efficiency and extend gear life, an optimum output pinion design is required. To this end, in this study, an output pinion for worm gear decelerators was designed and optimized by means of product verification through prototyping and performance evaluation to improve gear life and productivity. The optimized design was validated and subjected to structural analysis.
Reduction of Positive-Bias-Stress Effects in Bulk-Accumulation Amorphous-InGaZnO TFTs
Seonghyun Jin,Tae-Woong Kim,Young-Gug Seol,Mativenga, Mallory,Jin Jang IEEE 2014 IEEE electron device letters Vol.35 No.5
<P>We report an abnormal negative threshold-voltage shift (ΔVTH) in bulk-accumulation (dual-gate driven) amorphous-InGaZnO (a-IGZO) thin-film transistors (TFTs) after application of positive-bias-stress (PBS). In devices annealed at 250°C for 2 h in vacuum, the negative ΔVTH is accompanied with subthreshold swing degradation, consistent with PBS-induced defect creation. Negative-bias-stress induces negligible ΔVTH, ruling out ion migration in the gate-insulator. By varying the top-gate length, it is found that the negligible ΔVTH is a function of bulk-accumulation. However, after vacuum annealing at 250°C for 100 h, PBS induces negligible ΔVTH, verifying that the negative ΔVTH in short-time annealed devices is related to defects in the bulk a-IGZO. Therefore, good PBS stability can be achieved in bulk-accumulation dual-gate a-IGZO TFTs by long-time vacuum anneal.</P>