3차원의 회로 모델링을 이용한 청색 GaN/InGaN LED의 전류 확산 효과에 관한 연구

황성민,심종인,Hwang, Sung-Min,Shim, Jong-In 한국광학회 2007 한국광학회지 Vol.18 No.2

본 논문에서는 GaN/InGaN 다중양자우물(MQW)의 청색 발광 다이오드(LED)에서의 3차원적인 전류 및 2차원적인 광 분포를 보여 주기 위해 새롭고 간단한 3차원 회로 모델링과 해석이 처음으로 제안되었으며 이를 실험적으로 검증하였다. LED의 회로 파라미터들은 금속 및 에피 박막의 저항과 다이오드만으로 이루어져 있으며 각각의 파라미터는 전송선 모델(TLM) 및 전압-전류의 특성으로부터 얻을 수 있다. 제안된 방법과 회로 파라미터를 상부로 발광하는(top-surface emitting) LED에 적용하여 금속 및 에피 박막의 각 저항 변화에 따라 활성층을 지나가는 전류 분포의 효과를 정량적으로 해석하였다. 그리고 제작된 청색 LED 소자의 발광 분포는 p-전극 주위에서 어두운 발광 분포를 보이는 해석 결과와 유사한 경향을 보여주었다. A new and simple method of 3-dimensional circuit modeling and analysis is proposed and verified experimentally for the first time by determining 3-dimensional current flow and 2-dimensional light distribution in blue InGaN/GaN multi-quantum well (MQW) light emitting diode (LED) devices. Circuit parameters of the LED consist of the resistance of the metallic film and epitaxial layer, and the intrinsic diode which represents the active region emitting the light. The circuit parameters are extracted from the transmission line model (TLM) and current-voltage relation. We applied the >> proposed method and extracted circuit parameters to obtain the light emission pattern in a top-surface emitting-type LED. The current spreading effect is analyzed theoretically and quantitatively with a variation of the resistance of metallic and epitaxial layers. The emitting-light distribution of the fabricated blue LED showed a good agreement with the analyzed result, which shows the dark emission intensity at the corner of the p-electrode.

오이 뿌리혹선충병에 대한 효율적인 저항성 검정법 확립

황성민,최경자,장경수,최용호,김진철 한국식물병리학회 2014 식물병연구 Vol.20 No.2

Root-knot nematodes represent a significant problem in cucumber, causing reduction in yield and quality. To develop screening methods for resistance of cucumber to root-knot nematode Meloidogyne incognita, development of root-knot nematode of four cucumber cultivars (‘Dragonsamchuk’, ‘Asiastrike’, ‘Nebakja’ and ‘Hanelbakdadaki’) according to several conditions such as inoculum concentration, plant growth stage and transplanting period was investigated by the number of galls and egg masses produced in each seedling 45 days after inoculation. There was no difference in galls and egg masses according to the tested condition except for inoculum concentration. Reproduction of the nematode on all the tested cultivars according to inoculum concentration increased in a dose-dependent manner. On the basis of the result, the optimum conditions for root-knot development on the cultivars is to transplant period of 1 week, inoculum concentration of 5,000 eggs/plant and plant growth stage of 3-week-old in a greenhouse (25 ± 5°C). In addition, under optimum conditions, resistance of 45 commercial cucumber cultivars was evaluated. One rootstock cultivar, Union was moderately resistant to the root-knot nematode. However, no significant difference was in the resistance of the others cultivar. According to the result, we suggest an efficient screening method for new resistant cucumber to the root-knot nematode, M. incognita.

신체의 구성부분에 대한 강제수사 및 그 적법요건에 관한 고찰 - 지문 융선을 중심으로 -

황성민 국민대학교 법학연구소 2020 법학논총 Vol.33 No.2

While there is a great need to protect society from crimes such as terrorism, drugs, organization, strong, cybercrime, etc., in order to discover the real truth about a specific group of criminals that have been intelligent, secreted, and organized, the evidence collection through digital devices such as smartphones is required. But it has become also a reality with the development of smart phone security technology, that it is not possible to decrypt the password for the smart device legally obtained by the investigating agency and in the end it is not possible to obtain core evidence. In this case, it is a question whether a forced investigation is possible. As a matter of fact, the fingerprint information has been used as an important means for personal identification in the past, so it has some legal basis for compulsory collection. And from a balanced point of view that forced urine collection and forced blood collection which are greater degree of human rights violations are allowed, the compulsory investigation of fingerprint information, which is unlikely to cause damage to physical health, should be allowed. However, a verification warrant will be needed in light of the fact that the fusion of fingerprints is permanently attached to the body, which is virtually impossible to separate, and that no expert knowledge is needed to decrypt them. The minimum compulsory exercise, which requires fingerprints to be touched on the home button of a smartphone, will find its legal basis as “other necessary dispositions for verification” under Articles 219 and 140 of the Criminal Procedure Act. Of course, the electronic information from the smartphone obtained through the decrypted password must be controlled through the legal principles and discussions related to the limitations of the seizure and search of electronic information, such as receiving a separate pre-seizure and search warrant. 테러·마약·조직·강력·사이버범죄 등 범죄로부터 사회를 보호해야할 필요성이 큰 반면에 지능화·밀행화·조직화된 특정 범죄군에 대한 실체적 진실의 발견을 위해서는 스마트폰 등 디지털기기를 통한 채증이 반드시 필요한 현실이 되었으나, 스마트폰 보안기술의 발달로 수사기관에서 적법하게취득한 스마트기기에 대한 암호를 풀지 못해 결국 핵심 증거를 채증하지못하는 경우가 많아지면서, 암호해제를 위해 가장 보편적으로 사용되어지는 지문의 융선에 대한 강제수사가 가능할지 여부가 문제된다. 살피건대, 지문정보는 이전부터 개인식별을 위한 중요한 수단으로 사용되어져 강제적 채취에 일부 법적근거를 가지기도 하였을 뿐만 아니라, 침습적 행위가 전제되어 인권침해의 정도가 더 큰 강제채뇨·강제채혈의 허용성도 통설 및 판례가 이를 인정하고 있는 균형적 관점에서 보았을 때, 신체건강의 훼손이 일어날 가능성이 거의 없는 지문정보에 대한 강제수사자체는 허용되어져 할 것이다. 다만, 지문의 융선은 신체에 상시적으로 접착되어 있어 사실상 분리가불가능하고, 이를 통한 암호해제에 특별히 전문가의 식견이 필요 없다는점에 비추어 검증영장에 의하되, 지문을 스마트폰의 홈버튼에 터치하도록하는 최소한도의 강제력 행사는 형사소송법 제219조(인용규정), 제140조(검증과 필요한 처분)에 따라 ‘검증을 함에 기타 필요한 처분’으로서 그 법적근거를 찾을 수 있을 것이다. 물론, 이렇게 해제된 암호를 통해 얻어진 스마트폰으로부터의 전자정보에 대해서는 별도의 사전압수·수색영장을 받는 등 전자정보에 대한 압수· 수색의 한계와 관련된 법리 및 논의를 통해 통제되어야 함은 물론이다.

스마트폰에 대한 긴급압수⋅수색의 효력 범위에 관한 고찰

황성민 단국대학교 법학연구소 2020 법학논총 Vol.44 No.3

The importance of forensic evidence derived from digital equipment such as smartphones, tablet PCs and smartwatches has been growing day by day in the recent investigative environment. In particular, smartphones are always carried around in almost every daily process, so there may be conclusive evidence to prove any criminal charges, such as messages, location information, Internet search data, photos and videos, voice materials, various memos, phone numbers, phone calls, and payment details. In addition, mobile devices, such as smartphones, are often confiscated under the warrant’s exception rules, such as search and seizure at the scene of arrest and search for 24 hours after emergency arrest, due to their characteristics that they are always carried and easily transported to the human body. Therefore, it may be questionable whether the emergency seizure will take effect even on electronic information stored in the smartphone, if it is urgently confiscated under the warrant’s exception rules without receiving a prior warrant. In my opinion, the above emergency seizure should be considered effective for the information that investigators can visually verify without any special technical measures during the natural use of the smartphone itself, which was urgently confiscated without a prior warrant. Therefore, in this case, only a post-warrant for the smartphone itself will be required. However, once the smartphone is urgently seized and it is sent back to the Digital Forensics Center to restore the information files, it is considerable to obtain additional warrant for the information file that has been e xtracted throu gh d igital f orensics, because i t is n ot t he d ata that c an be verified from the natural use of the smartphone itself. 최근 수사환경에서 스마트폰, 태블릿PC, 스마트워치 등 디지털 장비에서 도출되는 포렌직 증거의 중요성은 나날이 커지고 있다. 특히 스마트폰의 경우거의 모든 일상생활 과정에서 항상 휴대하게 되기 때문에 메시지, 위치정보, 인터넷검색 자료, 사진 및 동영상, 음성자료, 각종 메모, 전화번호, 통화내역, 결제내역 등 사생활 전반에 관한 무수한 정보가 함축되어지고 이로써 어떤 범죄혐의 입증에 결정적인 증거가 나올 확률이 높다. 더불어 스마트폰 등 모바일기기의 경우 사람의 신체에 항상 휴대되고 손쉽게 운반된다는 특성 때문에, 체포현장에서의 압수수색, 긴급체포 이후의 24시간 동안의 압수수색 등 영장주의 예외 규정을 통해 압수되어지는 경우가 많을 수 있다. 그렇다면 위와 같이 스마트폰의 편리한 휴대성으로 인하여 사전 압수수색영장을 발부 받지 아니한 상태에서 형사소송법상 영장주의의 예외 조항에 의하여 긴급하게 압수되었을 경우에, 스마트폰 내에 저장된 전자정보에까지도해당 긴급압수수색의 효력이 미칠 것인지가 문제될 수 있다. 생각건대, 영장 없이 긴급 압수된 스마트폰 자체의 자연적인 이용과정에서수사기관이 특별한 기술적 조치 없이 육안으로 확인할 수 있는 정보내용에 대해서는 위 긴급압수의 효력이 미친다고 보아야 한다. 따라서 이 경우는 스마트폰 자체에 대한 사후영장만 발부받으면 될 것이다. 그러나 일단 스마트폰을압수한 뒤에 이를 다시 디지털 포렌직 센터로 보내어 분석을 마친 후 디지털포렌직 센터에서 보내온 정보파일을 확인하여 그 과정에서 유효한 증거파일을확보하는 경우에는, 이미 스마트폰 자체의 자연적 사용을 통하여 축출할 수있는 자료가 아니므로, 해당 스마트폰 자체에 대한 사후 압수수색영장을 발부받음과 별도로 디지털 포렌직을 통해 축출한 정보파일에 대하여 추가로 사전압수수색 영장을 발부받도록 함이 상당하다.

고추 풋마름병에 대한 효율적인 저항성 검정법 확립

황성민,장경수,최용호,김헌,최경자 한국식물병리학회 2017 식물병연구 Vol.23 No.4

Bacterial wilt caused by Ralstonia solanacearum is an important disease in cultivation of chili pepper, causing plant death and significant yield losses. Cultivation of disease-resistant varieties is the most suitable measure to control bacterial wilt of chili pepper. To establish an efficient screening method for resistant chili pepper to R. solanacearum, six resistant or susceptible cultivars to the R. solanacearum were selected and the development of bacterial wilt on the cultivars according to several conditions was investigated. Drenching bacterial suspension into the cut roots using a scalpel was more simple and effective to distinguish resistant and susceptible cultivars than inoculation methods of root-dipping or soil-drenching without wounding. A resistant pepper, ’MC4’ to R. solanacearum showed high resistance under the developed conditions which were 21- to 28-day-old pepper inoculated with 1×108 cfu/ml of bacterial suspension. On the other hands, the susceptible cultivars represented high disease severity under the conditions. These results indicated that we developed an efficient method to evaluate resistance of chili pepper cultivars against bacterial wilt. In addition, we successfully evaluated resistance degree of 140 commercial chili pepper cultivars to R. solanacearum using the developed method.

Si1-xGex Positive Feedback Field-effect Transistor with Steep Subthreshold Swing for Low-voltage Operation

황성민,김형진,권대웅,이종호,박병국 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.2

The most prominent challenge for MOSFET scaling is to reduce power consumption; however, the supply voltage (VDD) cannot be scaled down because of the carrier injection mechanism. To overcome this limit, a new type of field-effect transistor using positive feedback as a carrier injection mechanism (FBFET) has been proposed. In this study we have investigated the electrical characteristics of a Si1-xGex FBFET with one gate and one-sided Si3N4 spacer using TCAD simulations. To reduce the drain bias dependency, Si1-xGex was introduced as a low-bandgap material, and the minimum subthreshold swing was obtained as 2.87 mV/dec. This result suggests that a Si1-xGe¬x FBFET is a promising candidate for future low-power devices.

철강 부원료의 질소/산소 분석방법 연구

황성민,박태창,전영민,손연승 한국환경분석학회 2013 제1회 한국분석기술단체 총 연합 합동 심포지엄 Vol.0 No.-

BT인으로 성장시켜 준 사람들

황성민 한국생물공학회 2021 BT NEWS Vol.28 No.2

다리에 발생한 습진모양 잠행백선

황성민,서무규,김동민,하경임,김정란 대한의진균학회 2011 대한의진균학회지 Vol.16 No.2

Tinea incognito is the dermatophytosis of atypical clinical presentation that induced by topical and systemic corticosteroid treatment or new class of topical non-steroidal agent such as tacrolimus or pimecrolimus. We report a case of eczema-like tinea incognito in a 15-year-old girl. The lesions were manifested by pruritic to tender, scaly well-demarcated erythematous macules and patches with pustules on the lateral side of right shin. She had been treated with topical corticosteroid and pimecrolimus for 6months. Direct microscopic examination of the lesion was positive for hyphae and fungal culture revealed colonies of Trichophyton(T.) rubrum. Histopathologic examination of the skin lesion showed mild perivascular inflammation with presence of fungal hyphae in the horney layer of the epidermis. The patient was treated with 250 mg of terbinafine daily for 1 month and topical lanoconazole application. Skin lesions improved one month after the treatment, and no recurrence was observed.

초소형 비행체에서 리블렛을 이용한 표면마찰항력 감소에 관한 연구

황성민,정진택 한국항공우주학회 2004 한국항공우주학회 학술발표회 논문집 Vol.- No.-