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손정호,권영욱,Son, Jeong Ho,Gwon, Yeong Uk Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.11
Single crystals of nanocomposite [GaO4Al12(OH)24(H2O)12][Al(OH)6Mo6O18]2(OH)${\cdot}$30H2O, 2, were obtained by the reaction between [GaO4Al12(OH)24(H2O)12]7+ and [Mo7O24]6- clusters in an aqueous solution, analogously to the [AlO4Al12(OH)24(H2O)12][Al(OH)6Mo6O18]2(OH)${\cdot}$29.5H2O nanocomposite, 1. The crystal structure of 2 was determined by single crystal x-ray diffraction; space group $C2}c$ (No. 15), a = 27.418(2) $\AA$, b = 15.647(2) $\AA$, c = 23.960(4) $\AA$, $\beta$ = $102.850(9)^{\circ}$, V = 10,021.5(20) $\AA3$ , Z = 4. Detailed analysis of the structural data show that the clusters are held by intimate hydrogen bondings of the surface O2- and OH- groups of the clusters as well as the ionic interactions between the oppositely charged cluster ions.
손정호,Son, Jeongho 대한임베디드공학회 2010 대한임베디드공학회논문지 Vol.5 No.1
In real-time embedded systems, the responsibility is the most important thing because it is related to human life. Context switching is a part of which can slow down the responsibility. We therefore should minimize the amount of state that needs to be saved during context switching. In this paper, we introduce a new architecture (Register Farm) for context switching which can exchange two contexts in one cycle time. Although it might increase the cost of MCU design and the complexity of circuit, it cannot miss any interrupt during context switching. Consequently, Register Farm architecture can make embedded systems spread out in human life because it can increase reliability and responsibility in real time embedded systems.
제강슬래그와 CaO를 이용한 폐광산 주변 중금속 오염 농경지 토양의 안정화 처리 연구
손정호,노훈,이선영,김성규,김길홍,박중규,양재규,장윤영,Son, Jung-Ho,Roh, Hoon,Lee, Sun-Young,Kim, Sung-Kyu,Kim, Gil-Hong,Park, Joong-Kyu,Yang, Jae-Kyu,Chang, Yoon-Young 한국지하수토양환경학회 2009 지하수토양환경 Vol.14 No.6
비소 및 여러 양이온 중금속으로 오염된 풍정광산 주변 밭토양 및 논토양의 안정화처리를 위해 CaO 및 제강슬래그를 여러 혼합비로 사용하였을 때의 적용성을 회분식 및 컬럼반응기를 이용하여 연구하였다. TCLP 용출시험법을 이용하여 안정화제 처리 전후의 중금속 고정화도 변화를 평가하였다. 안정화제로 제강슬래그만 사용한 경우에는 비소 및 양이온 중금속 모두에서 고정화도가 15% 이하로서 높지 않았다. 이러한 것은 제강슬래그 주요 성분인 $Fe_2O_3$와 $SiO_2$에 의한 중금속들의 안정화효과가 크지 않은 것과 제강슬래그 자체에 함유된 CaO에 의한 토양 pH 상승효과가 용출실험에 사용한 TCLP 용액의 산성도에 의해 상쇄된 것에 기인하여 나타난 것으로 여겨진다. CaO와 제강슬래그를 함께 사용한 경우에는 주입비율의 차이에 따른 양이온 중금속 제거율은 큰 변화가 없었으나 제강슬래그의 비를 높여 줄수록 비소의 제거율의 증가를 가져왔다. 컬럼실험에서도 CaO와 제강슬래그를 함께 주입한 경우 비소 및 양이온 중금속들의 용출농도는 처리기간 동안 수질배출허용 기준이하로 나왔다. 이것은 양이온 중금속의 경우 CaO 사용에 따른 pH 증가함에 따른 중금속의 고정화, 비소의 경우는 CaO에서 유리된 $Ca^{2+}$와 $AsO_4^{3-}$와의 반응에 의해서 생성되는 난용성의 $Ca_3(AsO_4)_2$가 생성되는 것에 기인한 결과로 판단된다. 비소 및 양이온 중금속이 함께 오염된 토양의 안정화에 CaO와 제강슬래그를 함께 주입할 경우 복합오염물질을 효과적으로 안정화처리가 가능함을 알 수 있었다. Applicability of CaO and steel slag as stabilizers in the treatment of field and paddy soils near Pungjeong mine contaminated with arsenic and cationic heavy metals was investigated from batch and column experiments. Immobilization of heavy metals was evaluated by TCLP dissolution test. Immobility of heavy metal ions was less than 15% when steel slag alone was used. This result suggests that $Fe_2O_3$ and $SiO_2$, known as the major component of steel slag, have little effect for the immobilization of heavy metal ions due to acidity of TCLP solution. Immobilization of cationic heavy metals was little affected by the ratio of CaO and steel slag while arsenic removal was increased as the ratio of steel slag to CaO increased. In the column test, concentrations of both arsenic and cationic heavy metals in effluents were below the water discharge guideline over the entire reaction period. This result can be explained by the immobilization of cationic heavy metals from the increased pH in soil solution as well as by the formation of insoluble $Ca_3(AsO_4)_2$. From this work, it is possible to suggest that arsenic and cationic heavy metals can be concurrently stabilized by application of both CaO and steel slag.
손정호(Jeong-Ho Son),김희승(Hi-Seung Kim),서동수(Dong-Su Sirh) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A network CD changer was implemented adopting MOST (Media Oriented Systems Transport) technology. It is controlled through network remotely and also conveys digital audio. The MOST CD changer is configured as a timing slave node. It has six CD slots and generates 16-bit resolution stereo audio at 44.1 ㎑ sampling frequency. Its response time regarding control message communication is within 30 ㎳ on average. Its functionality and dynamic behavior was investigated thoroughly. For that, a general and adaptable test environment was set up utilizing a commercial analysis tool. A few manual test programs were made and run in the environment.
손정호(Jung-Ho Son),유재형(Jae-H Yoo),안성찬(Sung-Chan An),노수원(Soo-Weon Noh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This paper presents the results and considerations of static and dynamic stress measurement of connecting rod and cylinder frame for medium-speed diesel engine. The static stress measurement for the connecting rod was done during bolt tightening and the dynamic stress for the cylinder frame was measured under the operating conditions. Three strain gages per one bolt were used to calculate the axial and bending stress induced by bolt tightening. These strain gages were attached on outer surface at the middle of bolt shank and the spacing between each gage was angle of 120 degree. All measuring points but the bolt were selected on the viewpoint of design verification and the kind of strain gage was determined according to stress status at the measuring points. The static and dynamic stress measured were used to confirm the structural strength and compared with the structural analyses.
손정호(Jung-Ho Son),김병주(Byung-Joo Kim),박진수(Jinsoo Park) 한국마린엔지니어링학회 2004 한국마린엔지니어링학회 학술대회 논문집 Vol.2004 No.-
This paper presents the procedure and results of the structural analysis for the connecting rod of a medium-size marine diesel engine. Press fitting of bearing shells at the big end and shrink fitting of bearing bush at the small end have been simulated including the fully mechanical contact between the neighboring components such as big end upper, big end lower, and conrod shaft. According to the fabrication procedure of the connecting rod, FE analysis have been performed.<br/> At the initial design stage of connecting rod, FE analysis presents the comprehensive understanding for structural behavior and information for validation of design parameter. It was confirmed that fatigue strength of the connecting rod was sufficient and each design parameter was within the allowable level.<br/>