나노바이오칩 특허 분석을 통한 기술 개발 전략

백승준,박환돈,김종민,이상록,장상목 東亞大學校附設 生産技術硏究所 2007 生産技術硏究所硏究論文集 Vol.12 No.-

This article is viewed and summarized about the nano- biochip, especially DNA -chip, technology and its application by analyzing the patent application trend and technical developing trend. We would like to suggest the direction of technical development of nano- biochip and its diverse application hereafter.

개수로 흐름에서 난류가 관성입자의 침강속도에 미치는 영향에 대한 실험연구

백승준,박용성,정성현,서일원,정원,Baek, Seungjun,Park, Yong Sung,Jung, Sung Hyun,Seo, Il Won,Jeong, Won 한국수자원학회 2022 한국수자원학회논문집 Vol.55 No.11

Existing particle tracking models predict vertical displacement of particles based on the terminal settling velocity in the stagnant water. However, experimental results of the present study confirmed that the settling velocity of particles is influenced by the turbulence effects in turbulent flow, consistent with the previous studies. The settling velocity of particles and turbulent characteristics were measured by using PTV and PIV methods, respectively, in order to establish relationship between the particle settling velocity and the ambient turbulence. It was observed that the settling velocity increase rate starts to grow when the particle diameter is of the same order as Kolmogorov length scale. Compared with the previous studies, the present study shows that the graphs of the settling velocity increase rate according to the Stokes number have concave shapes for each particle density. In conclusion, since the settling velocity in the natural flow is faster than in the stagnant water, the existing particle tracking model may estimate a relatively long time for particles to reach the river bed. Therefore, the results of the present study can help improve the performance of particle tracking models.

나노관련 기업체실태조사를 통한 나노기술실용화 현황 분석

백승준,박환돈,장상목,권영수,이상호 대한전기학회 2009 전기의 세계 Vol.58 No.3

이온선택성 전극을 활용한 모바일 수질 모니터링 시스템

백승준,성찬영,최상호,박연수,김민수 대한전자공학회 2018 전자공학회논문지 Vol.55 No.2

본 논문은 이온선택성 전극(ion selective electrodes: ISE) 센서 기반의 리더기, 안드로이드 APP과 휴대폰 기반 스마트 미터(smart meter: SM) 및 원격 서버로 구성되는 저가형 모바일(이동식) 수질 모니터링 시스템을 제안한다. 제안 시스템은 안드로이드 APP을 이용하여 수질 오염유무를 발생 현장에서 즉시 판정하는 실시간 모바일 모니터링으로 불법적인 무단 폐수 방류에 효과적이고 신속한 대처를 가능하게 한다. 제안한 ISE 센서는 스크린 인쇄기법을 기반으로 제작되어 저가형이며 기존의 ISE에 비해 여러 이온선택성 전극을 하나의 형태로 제작하여 대량생산과 함께 소형화가 용이하다. 각 센서는 Nerenst Equation에 의거 시료의 전위차로부터 이온농도를 측정하며 측정 데이터는 리더기를 경유 블루투스를 통해 SM으로 보내어진다. SM의 안드로이드 APP은 수신한 측정 데이터를 이용 GUI 기반 실시간 분석으로 시료의 오염유무를 간단히 판정한다. APP은 또한 시료 분석 결과를 측정 데이터와 함께 WiFi 혹은 WAN(Wide Area Networks) 망에 연결된 웹 서버로 보내주어 원격 감시 및 DB (MySQL) 확보(저장)를 가능하게 한다. 테스트 베드는 마스터(SM)-슬레이브(리더기) 방식으로 구현되며, 리더기는 atmega328 MCU 칩(Chip)을 갖는 아두이노 우노보드로 설계한다. SM와 리더기 간 통신은 블루투스(HC-06) 모듈을 활용하며 리더기는 I2C(Inter-Integrated Circuit) 통신 방식을 통해 각 이온선택성 전극을 제어한다. This paper proposes a low-cost mobile water quality monitoring system consisting of ion-selective electrode (ISE) sensor-based reader, android APP and a smartphone-based smart meter (SM), and a remote server. The proposed system enables effective and prompt countermeasures against unauthorized wastewater discharge by real-time mobile monitoring that instantly judges the presence or absence of water pollution using Android app (APP). The proposed ISE sensor is manufactured based on the screen printing technique and is low price. It is possible to manufacture various ion selective electrodes in one form compared with the existing ISE, and it is easy to miniaturize together with mass production. Each ISE sensor measures the ion concentration from the potential difference of the sample according to the Nerenst Equation, and its sensor sends the measurement data to the SM via Bluetooth. The APP of SM then determines whether the sample is contaminated and sends that information to a web server connected to a WiFi network or a WAN (Wide Area Networks) network, which enables remote water quality monitoring and database (MySQL) storage. The testbed is implemented as a master (SM)-slave (reader) scheme, and the reader is designed with an Arduino Uno board that has an atmega328 MCU chip. The APP to reader communication uses the Bluetooth (HC-06) module and the reader controls ISE sensors through the I2C (Inter-Integrated Circuit) communication.

Hydrate seeding effect on the metastability of CH4 hydrate

백승준,이원형,민주원,안윤호,강동우,이재우 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.2

Cyclopentane (CP) hydrate seeds can lead to nucleation of CH4 hydrate with a lower supersaturation; the concept of nucleation potential was applied to estimate the metastable zone width (MSZW) of CH4 hydrate. To verify the crystal structure of CH4 hydrate formed from the CP hydrate seeds, the hydrate samples were analyzed by high resolution powder diffraction (HRPD). 1wt% of CP hydrates in the system reduced the MSZW of CH4 hydrate from 3.39 K to 1.32 K, and showed synergetic performance with sodium dodecyl sulfate (SDS). From the hydrate nucleation theory, SDS is able to decrease the effective surface energy for heterogeneous nucleation on the stainless steel wall, but the CP hydrate seeds provide new nucleation sites with even lower surface energy than that of the stainless steel wall. Hence, the nucleation rate depends on the amount of CP hydrate seeds, and the kinetic parameter can be estimated from the concentration of nucleation sites on the CP hydrate seeds. Also, the MSZW of CH4 hydrate was satisfactorily correlated with the amount of CP hydrate seeds by the cumulative nucleation potentials using estimated kinetic parameters.

비외상성 동맥류성지주막하출혈 환자에서 SAFARI 점수를 이용한경련 발생 예측의 유용성

백승준,홍대영,김신영,김종원,박상오,이경룡,백광제 대한응급의학회 2018 대한응급의학회지 Vol.29 No.5

Objective: The SAFARI score was introduced to assess the risk of convulsive seizure during admission for aneurysmal subarachnoid hemorrhage in 2017. This study was conducted to determine whether the SAFARI score derived from the afore-mentioned study could be applied to patients with aneurysmal subarachnoid hemorrhage in Korea. Methods: We conducted a retrospective study of patients who were diagnosed with aneurysmal subarachnoid hemorrhage from March 2013 to October 2017. Patients’ age, sex, blood pressure, pulse rate, body temperature, Glasgow- Coma Scale, Hunt-Hess scale, modified Fisher grade, size of ruptured aneurysm, surgery type, transfusion, and SAFARI score were compared between the seizure and non-seizure groups. The area under the receiver operator characteristic curves was calculated to evaluate the predictive ability for seizure during admission. Logistic regression analysis was used to analyze predictive factors for seizure during admission. Results: A total of 220 patients were included. Ninety-seven (44.1%) were male and 123 (55.9%) were female. The mean age of the patients was 65.8 years old (range, 56-75). The area under the curve of the SAFARI score for predicting seizure was 0.813. The SAFARI score was the only significant predictor of seizure during admission, while other factors were not statistically significant upon logistic regression analysis. Conclusion: The SAFARI score could be used for predicting seizure during admission in patients with aneurysmal subarachnoid hemorrhage.

DDS를 이용한 QPSK 변조 방식 ( Direct QPSK Modulation Using DDS )

백승준,정용주,한영열 대한전자공학회 1994 대한전자공학회 학술대회 Vol.1994 No.11

치아종으로 인한 매복치아의 치료증례

백승준,이광수 대한소아치과학회 2000 大韓小兒齒科學會誌 Vol.27 No.3

치아종은 치아 조직의 비정상적인 과성장으로 인해 형성되는 외배엽성 상피세포와 중배엽성 세포로 이루어진 혼합종양이라고 정의되며 양성 치성 종양 중에서 가장 흔한 질환이다. 최근 연구에 따르면 치아종은 신생물(neoplasm)보다는 형태와 조직 분화가 다양한 양상을 보이는 형성이상이나 과오종으로 보고 있다. 치아종은 복합 치아종(Compound Type), 복합 치아종(Complex Type) 그리고 법랑아 섬유치아종(Ameloblastic fibroodontoma)으로 구분하고 있다. 복합 치아종은 치아와 유사한 형태를 띠고 있으며 전체 발생 비율의 약 2/3를 차지하고 있다. 복잡 치아종은 치성 조직의 비조직화된 형태로서 악골에 고르게 분포되어 발생하고 있다. 법랑아 섬유치아종의 발생은 드물다. 치아종의 병인으로는 외상, 감염, 유전 혹은 치아 발육의 유전적 조절을 방해하는 돌연변이 유전자 등이 언급되고 있다. 치아종은 종종 다양한 맹출 장애와 치아 위치에 있어 문제를 유발할 수 있다. 따라서 치아종의 가장 빈번한 발견 요인으로서는 유치의 만기 잔존과 더불어 영구치의 매복이 있다.치아종으로 인한 지연 맹출과 감별 진단 해야 할 것으로서는 과잉치, 만곡치, 법랑 진주 그리고 유치의 조기 상실 등이 있다. 치아종으로 인한 매복 치아의 치료 방법으로는 우선 치아종을 제거한 후 매복 치아의 자발적 맹출을 기대하는 것이다. 이때 매복된 치아의 자발적 맹출을 기대하기 위해선 악골내 충분한 맹출 공간을 평가한 후 공간의 확보와 치근 발육이 진행중이라는 전제 조건이 수반되어야 한다. 만일 치아종을 제거한 후에도 불구하고 매복 치아의 맹출이 이루어지지 않을 경우에는 매복 치아의 노출 후 교정적 부착장치를 위치시킨 후 강제 견인한다. 본 증례는 치아종으로 인해 영구 계승치가 매복된 환아에게서 매복치의 외과적 노출 시행 후 교정적 치료방법을 사용해 비교적 양호한 결과를 얻었기에 보고하는 바이다. 주요어 : 치아종, 매복 치아, 지연 맹출, 공간 평가 Odontoma is defined as a benign odontogenic tumor containing enmel, dentin as well as cementum. It has come to mean a growth in which both the epithelial and the mesenchymal cells exhibit complete differentiation. Most authorities accept the view today that the odontoma represents a hamartomatous malformation rather than a true neoplasm. The etiology of odontomas is uncertain but hypothesized to involve local trauma, infection inheritance or mutant gene. The odontomas often cause various disturbances in the eruption and position of the teeth. The steps in removal of an odontoma in close relation to an adjacent impacted normal tooth should comprise 1) removal of odontoma and 2) exposure of the impacted tooth. Orthodontic therapy may be applied. Before treatment, the necessary space fur the impacted tooth should be evaluated. If there is lack of space in the dental arch, orthodontic treatment should be carried out before operation.

일반총설 : 알기 쉬운 지식재산권 제도의 해설

백승준 한국고무학회 2013 고무기술 Vol.14 No.1

차기 적외선 섬광제 저장수명 예측

백승준,손영갑,김남진,권태수,Back, Seungjun,Son, Youngkap,Kim, Namjin,Kwon, Taesoo 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.3

This paper shows storage life estimation of next IR(infrared) flare material through accelerated degradation tests. Three temperature conditions for the accelerated degradation tests are 55, 65 and $75^{\circ}C$. Six performances of IR flare material are burning time, IR peak/continuous Intensity, total energy of near/mid-IR and color ratio, and they were measured after the tests. Storage life of the IR flare material was estimated through both analyzing the degradation data of those performances and applying distribution-based degradation models to the data. Over 30 years of storage life at $20^{\circ}C$ is estimated in terms of IR peak intensity with reliability 0.99 and confidence level 99 %. Additionally, 10 years of storage period at $21^{\circ}C$ would be equivalent to 68 days of accelerated test at $65^{\circ}C$ from the activation energy in Arrhenius model.