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The Effect of the RF-Sputtering Condition on the ZrO2 Thin Film's Characteristics
Honglae Sohn,B. J. Lee,조영태 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.3
ZrO2 thin films were prepared by RF reactive magnetron sputtering at different sputtering powers and different O2 concentrations. These thin films were characterized by using X-ray diffraction (XRD) and scanning electron microscopy (SEM). With a sputtering power above 400 W, diffraction peaks appeared not only on the (002) plane but also on the (102), (111) and (122) planes, indicating that thin-film crystals had grown into a polyphase to give randomly oriented structures. No diffraction peak for the tetragonal structure was found. The ZrO2 thin films prepared with O2 concentrations above 5.0 % had a preferred orientation along the (002) plane monoclinic structure of ZrO2.
시각장애인을 위한 통신 프로그램의 사용자 인터페이스 개발
이홍래(Honglae Lee),전중남(Joongnam Jeon),김석일(Sukil Kim) 한국정보과학회 1996 한국정보과학회 학술발표논문집 Vol.23 No.1A
기존의 컴퓨터 사용 환경으로는 시각장애인이 컴퓨터를 사용하는 데 많은 불편이 따른다. 특히, 시각장애인들이 컴퓨터 통신을 사용하기 위해서는 기존 통신 프로그램의 기능 이외에 특별히 시각장애인들을 위한 사용자 인터페이스가 개발되어야 한다. 우리는 시각장애인을 위한 통신 프로그램인 ‘소리로’를 개발하였으며, 본 논문에서는 ‘소리로’의 사용자 인터페이스에 포함되어 있는 기능을 소개한다. ‘소리로’의 핵심적인 특징은 시각장애인에게 통신 상황을 음성을 통해 확인할 수 있도록 했다는 점이다. 다양한 음성설정 기능을 두어 사용자의 편의성과 통신 상황에 맞게 음성지원을 받을 수 있도록 하였으며, 통신 모드와 읽기 모드의 분리, 도움말 읽기, 작업 환경 읽기, 전자 점자 출력, 파일 송수신 상태 읽기, 화면 읽기 설정 등의 기능을 제공함으로써, 시각장애인들이 편리하게 컴퓨터 통신을 할 수 있도록 하였다.
Enhanced explosive sensing based on silole-modified luminescent porous silicon
Sohn Honglae 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.1
A porous silicon sensor capable of rapidly detecting explosive vapors has been developed based on quenching fluorescence of silole-modified porous silicon (PSi). The silole-modified PSi sensor for the detecting explosives is based on FRET between silole molecule and PSi. The silole molecules and fresh PSi emit fluorescence at the wavelength of 506 and 717 nm. Surface morphologies of fresh PSi and surface-modified PSi were obtained with a cold FE-SEM. The quenching of PL is observed with increasing time of exposure to dinitrotoluene (DNT), picric acid (PA), and trinitrotoluene (TNT). The quenching efficiency as a function of time for TNT is more significant than for DNT or PA. The sensing efficiency of silole-modified PSi is much higher than that of fresh PSi for the corresponding analyte. The silole-modified PSi provides a new sensing system with high sensitivity and good selectivity for TNT.
복합형 유역모델 STREAM의 개발(1): 모델 구조 및 이론
조홍래 ( Honglae Cho ),정의상 ( Euisang Jeong ),구본경 ( Bhonkyoung Koo ) 한국물환경학회 2015 한국물환경학회지 Vol.31 No.5
Distributed models represent watersheds using a network of numerous, uniform calculation units to provide spatially detailed and consistent evaluations across the watershed. However, these models have a disadvantage in general requiring a high computing cost. Semi-distributed models, on the other hand, delineate watersheds using a simplified network of non-uniform calculation units requiring a much lower computing cost than distributed models. Employing a simplified network of non-uniform units, however, semi-distributed models cannot but have limitations in spatially-consistent simulations of hydrogeochemical processes and are often not favoured for such a task as identifying critical source areas within a watershed. Aiming to overcome these shortcomings of both groups of models, a hybrid watershed model STREAM (Spatio-Temporal River-basin Ecohydrology Analysis Model) was developed in this study. Like a distributed model, STREAM divides a watershed into square grid cells of a same size each of which may have a different set of hydrogeochemical parameters reflecting the spatial heterogeneity. Like many semi-distributed models, STREAM groups individual cells of similar hydrogeochemical properties into representative cells for which real computations of the model are carried out. With this hybrid structure, STREAM requires a relatively small computational cost although it still keeps the critical advantage of distributed models.
안드로이드 덱스클래스로더 실행흐름 변경을 통한 원본 앱 노출 방지 기법
조홍래(Honglae Jo),최준태(Joontae Choi),하동수(Dongsoo Ha),신진섭(Jinseop Shin),오희국(Heekuck Oh) 한국정보보호학회 2017 정보보호학회논문지 Vol.27 No.6
런타임 실행 압축 기술을 이용하는 안드로이드 패커(packer) 서비스는 덱스클래스로더(DexClassLoader)를 이용하여 원본 어플리케이션으로 전환한다. 하지만 덱스클래스로더의 API 인터페이스는 로드할 덱스(Dalvik EXcutable)의 경로와 컴파일 된 파일의 경로를 입력 받으므로 원본이 파일시스템에 드러나는 문제점이 있다. 따라서 해당 API를 패커 서비스에 그대로 사용하는 것은 안전하지 않다. 본 논문에서는 이 문제를 해결하기 위해 덱스클래스로더 API의 컴파일 흐름과 로드 흐름을 변경하여 해결하였다. 이 변경된 실행 흐름으로 인해 컴파일 된 파일을 암호화하여 파일 시스템에 두거나 메모리에만 존재하도록 하고, 이후 로드할 때 복호화 또는 치환을 하여 원본앱 전환을 가능하게 한다. 제안하는 기법을 통해 원본 파일이 파일시스템에 노출되지 않음으로써 패커의 안정성이 올라갈 것이라 예상한다. The android packer service using runtime execution compression technology switches to the original application using DexClassLoader. However the API interface of the DexClassLoader receives the path of the loaded DEX(Dalvik EXcutable) and the path of the compiled file. So there is a problem that the original file is exposed to the file system. Therefore, it is not safe to use the API for the packer service. In this paper, we solve this problem by changing the compile and load flow of the DexClassLoader API. Due to this changed execution flow, the complied file can be encrypted and stored in the file system or only in the memory and it can be decrypted or substituted at the time of subsequent loading to enable the original application conversion. we expected that the stability of the packer will increase beacause the proposed method does not expose the original file to the file system.
Preparation of water-soluble silicon quantum dots and their optical property
Sohn Honglae 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.10
New water-soluble silicon quantum dots (Si QDs) with substantial photoluminescence (PL) in the visible region are simply prepared in one-pot synthesis at room temperature for biomedical applications. Hydroxide-capped Si QDs are water-soluble and their PL characteristics were investigated by PL spectroscopy. The water-soluble Si QDs emit the PL at 470 nm with a full width at half maximum height (FWHM) of 90 nm. Absolute quantum yields were measured and were 6%. The integrated PL as a function of time for the water-soluble Si QDs indicates that the PL of water-soluble Si QDs are stable.
Fabrication and Characterization of Optically Encoded Porous Silicon Smart Particles
Sohn, Honglae The Basic Science Institute Chosun University 2014 조선자연과학논문집 Vol.7 No.4
Optically encoded porous silicon smart particles were successfully fabricated from the free-standing porous silicon thin films using ultrasono-method. DBR PSi was prepared by an electrochemical etch of heavily doped $p^{{+}{+}}$-type silicon wafer. DBR PSi was prepared by using a periodic pseudo-square wave current. The surface-modified DBR PSi was prepared by either thermal oxidation or thermal hydrosilylation. Free-standing DBR PSi films were generated by lift-off from the silicon wafer substrate using an electropolishing current. Free-standing DBR PSi films were ultrasonicated to create DBR-structured porous smart particles. Optical characteristics of porous smart particles were measured by FT-IR spectroscopy. The surface morphology of porous smart particles was determined by FE-SEM.